/* roulang page: index */
:root {
    --primary: #4B8DFF;
    --primary-dark: #3A7BEF;
    --primary-darker: #2E69D6;
    --primary-light: #EEF4FF;
    --accent: #FF7A59;
    --success: #17B890;
    --bg: #F5F8FC;
    --white: #FFFFFF;
    --text: #182233;
    --text-body: #3F4A5A;
    --text-muted: #6B7B8D;
    --border: #E2E9F2;
    --border-light: #E8EDF3;
    --shadow: 0 6px 24px rgba(42, 70, 110, 0.06);
    --shadow-hover: 0 12px 32px rgba(42, 70, 110, 0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 8px;
    --radius-pill: 20px;
    --font: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', 'Inter', 'Helvetica Neue', Arial, sans-serif;
    --spacing-section: 96px;
    --spacing-section-md: 72px;
    --spacing-section-sm: 56px;
    --container: 1200px;
    --transition: all .3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-body);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

img { max-width: 100%; display: block; border: 0; }

a { color: inherit; text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary); }

ul, ol { list-style: none; }

input, button, select, textarea { font-family: inherit; font-size: inherit; outline: none; }

button { cursor: pointer; border: none; background: none; }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding-left: 24px;
    padding-right: 24px;
    width: 100%;
}

/* ========== Header / Nav ========== */
.site-header {
    background: var(--white);
    border-bottom: 1px solid var(--border-light);
    height: 68px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.brand {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    flex-shrink: 0;
}

.brand-main {
    font-size: 20px;
    font-weight: 650;
    color: var(--text);
    letter-spacing: .5px;
}

.brand-sub {
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 3px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.main-nav ul {
    display: flex;
    gap: 28px;
}

.main-nav ul li a {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-body);
    padding: 6px 2px;
    position: relative;
}

.main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

.main-nav ul li a:hover { color: var(--primary); }
.main-nav ul li a:hover::after { width: 100%; }

.main-nav ul li.active a {
    color: var(--primary);
    font-weight: 600;
}

.main-nav ul li.active a::after {
    width: 100%;
}

.nav-login-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 20px;
    border-radius: var(--radius-sm);
    background: var(--primary);
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.nav-login-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    color: var(--white);
    box-shadow: 0 4px 12px rgba(75, 141, 255, .3);
}

.menu-toggle {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--border);
    background: var(--white);
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
}

.menu-toggle .menu-text { font-size: 13px; color: var(--text-body); font-weight: 500; }

/* ========== Hero ========== */
.hero {
    padding: 80px 0 64px;
    background: var(--white);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    bottom: -80px;
    right: -80px;
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: rgba(75, 141, 255, .06);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: 40px;
    left: -60px;
    width: 120px;
    height: 120px;
    background: rgba(255, 122, 89, .04);
    border-radius: 50%;
    pointer-events: none;
}

.hero-inner {
    display: grid;
    grid-template-columns: 55% 45%;
    gap: 56px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 16px;
    border-radius: var(--radius-pill);
    background: var(--primary-light);
    color: var(--primary);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: .5px;
    margin-bottom: 20px;
}

.hero-badge::before {
    content: '';
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
}

.hero h1 {
    font-size: 38px;
    font-weight: 700;
    line-height: 1.25;
    color: var(--text);
    margin-bottom: 20px;
    letter-spacing: .5px;
}

.hero-sub {
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 28px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
    line-height: 1.4;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(75, 141, 255, .25);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(75, 141, 255, .35);
}

.btn-primary:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(75, 141, 255, .35), 0 8px 24px rgba(75, 141, 255, .2);
}

.btn-primary:active {
    background: var(--primary-darker);
    transform: translateY(0);
}

.btn-outline {
    background: var(--white);
    color: var(--primary);
    border: 1px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(75, 141, 255, .25);
}

.btn-lg { padding: 14px 36px; font-size: 16px; }

.btn-block { width: 100%; }

.hero-trust {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.hero-trust span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--text-muted);
}

.hero-trust i {
    color: var(--success);
    font-size: 14px;
}

/* Login Card */
.hero-right {
    display: flex;
    justify-content: center;
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--white);
    border: 1px dashed var(--primary-light);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    position: relative;
    transition: var(--transition);
}

.login-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.login-card-banner {
    height: 120px;
    position: relative;
    background: linear-gradient(135deg, rgba(75, 141, 255, .8), rgba(75, 141, 255, .4));
}

.login-card-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: .85;
}

.login-card-body {
    padding: 28px;
    background: var(--white);
    position: relative;
}

.login-card-body h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    height: 42px;
    padding: 0 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    font-size: 14px;
    color: var(--text);
    background: var(--bg);
    transition: var(--transition);
}

.form-group input::placeholder { color: #B0BCD0; }

.form-group input:focus {
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px rgba(75, 141, 255, .15);
}

.login-card-body .btn {
    margin-top: 8px;
    height: 44px;
}

.login-links {
    display: flex;
    justify-content: space-between;
    margin-top: 16px;
    font-size: 13px;
}

.login-links a {
    color: var(--primary);
    font-weight: 500;
}

.login-links a:hover { text-decoration: underline; }

.security-tag {
    position: absolute;
    top: 12px;
    right: 12px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 12px;
    background: rgba(255, 255, 255, .9);
    border-radius: var(--radius-pill);
    font-size: 12px;
    color: var(--success);
    font-weight: 500;
    backdrop-filter: blur(4px);
    z-index: 2;
}

/* ========== Section Head ========== */
.section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 48px;
}

.section-head h2 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.3;
    margin-bottom: 12px;
}

.section-head p {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ========== Features ========== */
.features {
    padding: var(--spacing-section) 0;
    background: var(--bg);
}

.features-grid {
    display: grid;
    grid-template-columns: 1.1fr .9fr .9fr;
    grid-template-rows: auto auto;
    gap: 24px;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.feature-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--primary);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: rgba(255, 122, 89, .12);
    color: var(--accent);
    transform: rotate(-6deg);
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
    flex: 1;
}

.feature-card > a {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: auto;
}

.feature-card > a:hover { text-decoration: underline; gap: 6px; }

.feature-large {
    grid-row: 1 / 3;
    padding-bottom: 24px;
    position: relative;
    overflow: hidden;
}

.feature-large img {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 160px;
    height: 120px;
    object-fit: cover;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    opacity: .25;
    pointer-events: none;
}

.feature-large .feature-icon {
    width: 56px;
    height: 56px;
    font-size: 24px;
}

.feature-large h3 { font-size: 20px; }

.feature-large p { font-size: 15px; max-width: 80%; }

/* ========== News ========== */
.news-section {
    padding: var(--spacing-section) 0;
    background: var(--white);
}

.news-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.news-main {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.news-card {
    display: flex;
    gap: 20px;
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.news-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.news-thumb {
    width: 160px;
    height: 96px;
    border-radius: 12px;
    overflow: hidden;
    flex-shrink: 0;
    background: var(--bg);
}

.news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.news-body {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.news-meta {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--text-muted);
}

.news-cat {
    display: inline-block;
    padding: 2px 12px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 500;
}

.news-body h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.5;
    margin-bottom: 6px;
}

.news-body h3 a:hover { color: var(--primary); }

.news-body > p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 8px;
}

.news-more {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-top: auto;
}

.news-more:hover { text-decoration: underline; }

.empty-state {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 60px 24px;
    text-align: center;
    background: var(--bg);
}

.empty-icon {
    font-size: 40px;
    margin-bottom: 12px;
    color: var(--text-muted);
    opacity: .5;
}

.empty-state p {
    font-size: 15px;
    color: var(--text-muted);
}

/* News Sidebar */
.news-side {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.side-card {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.side-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-light);
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag-list a {
    display: inline-block;
    padding: 4px 14px;
    background: var(--bg);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-pill);
    font-size: 13px;
    color: var(--text-body);
    transition: var(--transition);
}

.tag-list a:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary-light);
}

.side-list li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light);
}

.side-list li:last-child { border-bottom: none; padding-bottom: 0; }

.side-list li:first-child { padding-top: 0; }

.side-list a {
    font-size: 14px;
    color: var(--text-body);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.side-list a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.side-list a i { font-size: 12px; color: var(--text-muted); }

/* ========== Testimonials ========== */
.testimonial-section {
    padding: var(--spacing-section) 0;
    background: var(--bg);
    overflow: hidden;
}

.testimonial-slider {
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    cursor: grab;
    padding-bottom: 20px;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

.testimonial-slider::-webkit-scrollbar { display: none; }

.testimonial-track {
    display: flex;
    gap: 24px;
    min-width: max-content;
    padding: 20px 4px;
}

.testimonial-card {
    width: 340px;
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    flex-shrink: 0;
    position: relative;
}

.testimonial-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.quote-mark {
    font-size: 40px;
    color: var(--primary);
    font-family: Georgia, serif;
    line-height: 1;
    margin-bottom: 12px;
    opacity: .4;
}

.testimonial-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-body);
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.stars {
    color: #FFA940;
    font-size: 14px;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    overflow: hidden;
    background: var(--primary-light);
    flex-shrink: 0;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-info strong {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    display: block;
}

.user-info span {
    font-size: 12px;
    color: var(--text-muted);
}

.slider-hint {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
}

.slider-hint i { color: var(--primary); }

/* ========== Trust Bar ========== */
.trust-bar {
    padding: 56px 0;
    background: var(--white);
    border-top: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.trust-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 16px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.trust-item:hover {
    background: var(--bg);
}

.trust-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    color: var(--primary);
    flex-shrink: 0;
}

.trust-item h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.trust-item p {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ========== FAQ ========== */
.faq-section {
    padding: var(--spacing-section) 0;
    background: var(--bg);
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
}

.faq-item.active {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    width: 100%;
    text-align: left;
    background: none;
    gap: 16px;
    transition: var(--transition);
}

.faq-question:hover { color: var(--primary); }

.faq-icon {
    font-size: 18px;
    color: var(--text-muted);
    transition: var(--transition);
    flex-shrink: 0;
    font-style: normal;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
}

.faq-item.active .faq-icon {
    transform: rotate(135deg);
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .35s ease;
}

.faq-answer-inner {
    padding: 0 24px 20px;
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.85;
}

.faq-answer-inner p + p { margin-top: 12px; }

/* ========== CTA ========== */
.cta-section {
    padding: 0;
    position: relative;
    background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
}

.cta-overlay {
    background: rgba(24, 34, 51, .72);
    padding: 100px 0;
    text-align: center;
}

.cta-overlay h2 {
    font-size: 30px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
    line-height: 1.3;
}

.cta-overlay p {
    font-size: 15px;
    color: rgba(255, 255, 255, .7);
    max-width: 560px;
    margin: 0 auto 32px;
    line-height: 1.8;
}

.cta-overlay .btn-white {
    background: var(--white);
    color: var(--primary);
    padding: 16px 44px;
    font-size: 16px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border-radius: var(--radius-sm);
    box-shadow: 0 8px 32px rgba(0, 0, 0, .2);
    transition: var(--transition);
}

.cta-overlay .btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, .3);
    color: var(--primary-dark);
}

.cta-overlay .btn-white:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, .4);
}

.cta-trust {
    margin-top: 20px;
    font-size: 12px;
    color: rgba(255, 255, 255, .5);
    letter-spacing: .5px;
}

/* ========== Footer ========== */
.site-footer {
    background: var(--white);
    border-top: 1px solid var(--border-light);
    padding-top: 56px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.2fr;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-brand .brand {
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
    max-width: 320px;
}

.footer-col h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 14px;
    color: var(--text-body);
}

.footer-col ul li a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-contact li {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 12px;
}

.footer-contact i {
    color: var(--primary);
    font-size: 14px;
    width: 20px;
    text-align: center;
}

.footer-bottom {
    border-top: 1px solid var(--border-light);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
}

/* ========== Responsive ========== */
@media (max-width: 1023px) {
    :root { --spacing-section: 72px; }

    .hero h1 { font-size: 32px; }
    .hero-inner { grid-template-columns: 1fr 1fr; gap: 36px; }

    .features-grid { grid-template-columns: 1fr 1fr; }
    .feature-large { grid-row: auto; grid-column: 1 / -1; }

    .news-layout { grid-template-columns: 1fr; }
    .news-side { flex-direction: row; flex-wrap: wrap; }
    .side-card { flex: 1; min-width: 220px; }

    .trust-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}

@media (max-width: 767px) {
    :root { --spacing-section: 56px; }

    .site-header { height: 60px; }

    .menu-toggle {
        display: inline-flex;
    }

    .main-nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        align-items: stretch;
        padding: 24px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: 0 12px 32px rgba(42, 70, 110, .1);
        display: none;
        z-index: 999;
        gap: 0;
    }

    .main-nav.open { display: flex; }

    .main-nav ul {
        flex-direction: column;
        gap: 8px;
        margin-bottom: 20px;
    }

    .main-nav ul li a {
        display: block;
        padding: 12px 8px;
        font-size: 18px;
        border-radius: var(--radius-xs);
    }

    .main-nav ul li.active a {
        background: var(--primary-light);
    }

    .main-nav ul li.active a::after { display: none; }

    .nav-login-btn {
        justify-content: center;
        padding: 14px;
        font-size: 16px;
    }

    .hero { padding: 48px 0; }
    .hero-inner { grid-template-columns: 1fr; }
    .hero h1 { font-size: 26px; }
    .hero-sub { font-size: 15px; }
    .hero-cta { flex-direction: column; }
    .hero-cta .btn { width: 100%; }
    .hero-trust { gap: 12px; justify-content: space-between; }

    .login-card { max-width: 100%; }

    .features-grid { grid-template-columns: 1fr; }

    .feature-large p { max-width: 100%; }
    .feature-large img { display: none; }

    .news-card { flex-direction: column; }
    .news-thumb { width: 100%; height: 160px; }

    .news-main { gap: 16px; }
    .news-side { flex-direction: column; }

    .testimonial-track { gap: 16px; }
    .testimonial-card { width: 280px; padding: 20px; }

    .trust-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .trust-item { padding: 12px; flex-direction: column; gap: 8px; }

    .cta-overlay { padding: 72px 0; }
    .cta-overlay h2 { font-size: 24px; }

    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-brand p { max-width: 100%; }

    .footer-bottom .container {
        flex-direction: column;
        gap: 4px;
        text-align: center;
        justify-content: center;
    }
}

@media (max-width: 520px) {
    .container { padding-left: 16px; padding-right: 16px; }
    .hero h1 { font-size: 23px; }
    .section-head h2 { font-size: 22px; }
    .section-head { margin-bottom: 32px; }
    .trust-grid { grid-template-columns: 1fr; }
}

/* ========== Accessibility ========== */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 2px;
}

/* roulang page: article */
:root {
    --primary: #4B8DFF;
    --primary-dark: #3A7AE6;
    --primary-light: #EEF4FF;
    --accent: #FF7A59;
    --success: #17B890;
    --bg: #F5F8FC;
    --bg-white: #FFFFFF;
    --text-heading: #182233;
    --text-body: #3F4A5A;
    --text-muted: #6B7B8D;
    --border: #E2E9F2;
    --border-light: #E8EDF3;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 10px;
    --radius-pill: 20px;
    --shadow-sm: 0 6px 24px rgba(42, 70, 110, 0.06);
    --shadow-lg: 0 12px 32px rgba(42, 70, 110, 0.12);
    --transition: all 0.3s ease;
    --font-sans: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
    --font-en: 'Inter', 'Helvetica Neue', Arial, sans-serif;
    --container: 1200px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.75;
    color: var(--text-body);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
}

ul, ol {
    list-style: none;
}

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
}

/* ===== Header / Nav ===== */
.site-header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-light);
    height: 72px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 24px;
}

.brand {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    text-decoration: none;
    flex-shrink: 0;
}

.brand-main {
    font-size: 20px;
    font-weight: 650;
    color: var(--text-heading);
    letter-spacing: 1px;
}

.brand-sub {
    font-size: 11px;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 5px;
    text-transform: uppercase;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.main-nav ul {
    display: flex;
    align-items: center;
    gap: 28px;
}

.main-nav ul a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-body);
    text-decoration: none;
    padding: 6px 0;
    position: relative;
    transition: var(--transition);
}

.main-nav ul a:hover {
    color: var(--primary);
}

.main-nav ul li.active a {
    color: var(--primary);
}

.main-nav ul li.active a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 100%;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.nav-login-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 40px;
    padding: 0 20px;
    border-radius: var(--radius-sm);
    background: var(--primary-light);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-login-btn:hover {
    background: var(--primary);
    color: #FFFFFF;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-heading);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
    .site-header {
        height: 64px;
    }
    .header-row {
        height: 64px;
    }
    .menu-toggle {
        display: flex;
    }
    .main-nav {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-white);
        height: calc(100vh - 64px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        transform: translateX(100%);
        transition: transform 0.35s ease;
        z-index: 99;
    }
    .main-nav.open {
        transform: translateX(0);
    }
    .main-nav ul {
        flex-direction: column;
        gap: 28px;
    }
    .main-nav ul a {
        font-size: 18px;
    }
    .nav-login-btn {
        height: 44px;
        padding: 0 28px;
    }
}

/* ===== Breadcrumb ===== */
.breadcrumb-bar {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-light);
    padding: 14px 0;
}

.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb a:hover {
    color: var(--primary);
}

.breadcrumb .divider {
    margin: 0 8px;
    color: #B6C0CE;
}

.breadcrumb .current {
    color: var(--text-heading);
    font-weight: 500;
    max-width: 260px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ===== Article Header ===== */
.article-header {
    background: var(--bg-white);
    padding: 48px 0 40px;
}

.article-header-inner {
    max-width: 860px;
    margin: 0 auto;
}

.article-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 16px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-pill);
    margin-bottom: 18px;
}

.article-header h1 {
    font-size: 38px;
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-heading);
    margin: 0 0 20px;
    letter-spacing: 0.5px;
}

.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 22px;
    font-size: 14px;
    color: var(--text-muted);
}

.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.article-meta i {
    color: var(--primary);
    font-size: 14px;
}

.article-meta a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.article-meta a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .article-header {
        padding: 32px 0 28px;
    }
    .article-header h1 {
        font-size: 28px;
        line-height: 1.35;
    }
    .article-meta {
        gap: 14px;
    }
}

/* ===== Article Body ===== */
.article-body {
    background: var(--bg);
    padding: 40px 0 64px;
}

.article-content-wrap {
    max-width: 860px;
    margin: 0 auto;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 48px 56px;
}

@media (max-width: 768px) {
    .article-content-wrap {
        padding: 28px 24px;
        border-radius: var(--radius-md);
    }
}

.article-content {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-body);
}

.article-content h2 {
    font-size: 26px;
    font-weight: 600;
    color: var(--text-heading);
    margin: 44px 0 18px;
    line-height: 1.4;
    letter-spacing: 0.3px;
}

.article-content h3 {
    font-size: 21px;
    font-weight: 600;
    color: var(--text-heading);
    margin: 36px 0 14px;
    line-height: 1.45;
}

.article-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-heading);
    margin: 28px 0 12px;
}

.article-content p {
    margin: 16px 0;
}

.article-content a {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.article-content a:hover {
    text-decoration: none;
    color: var(--primary-dark);
}

.article-content ul,
.article-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.article-content ul {
    list-style: disc;
}

.article-content ol {
    list-style: decimal;
}

.article-content li {
    margin-bottom: 8px;
    line-height: 1.75;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 24px 0;
}

.article-content blockquote {
    background: var(--primary-light);
    border-left: 4px solid var(--primary);
    padding: 18px 24px;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: 28px 0;
    color: var(--text-body);
    font-size: 16px;
    line-height: 1.7;
}

.article-content blockquote p:last-child {
    margin-bottom: 0;
}

.article-content pre {
    background: #182233;
    color: #F5F8FC;
    padding: 20px 24px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.7;
}

.article-content code {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 14px;
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 2px 6px;
    border-radius: 4px;
}

.article-content pre code {
    background: transparent;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

.article-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    font-size: 15px;
}

.article-content th,
.article-content td {
    border: 1px solid var(--border);
    padding: 12px 16px;
    text-align: left;
}

.article-content th {
    background: var(--primary-light);
    color: var(--text-heading);
    font-weight: 600;
}

.article-content tr:nth-child(even) {
    background: #FAFBFD;
}

.article-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 32px 0;
}

.article-content strong {
    color: var(--text-heading);
    font-weight: 600;
}

.article-content iframe {
    max-width: 100%;
    border-radius: var(--radius-md);
    margin: 24px 0;
}

/* ===== Article Empty ===== */
.article-empty {
    text-align: center;
    padding: 72px 24px;
}

.article-empty i {
    font-size: 52px;
    color: #B6C0CE;
    margin-bottom: 20px;
    display: block;
}

.article-empty h2 {
    font-size: 24px;
    color: var(--text-heading);
    margin-bottom: 10px;
}

.article-empty p {
    color: var(--text-muted);
    margin-bottom: 28px;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 46px;
    padding: 0 28px;
    background: var(--primary);
    color: #FFFFFF;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition);
    border: none;
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: #FFFFFF;
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(75, 141, 255, 0.3);
}

.btn-primary:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(75, 141, 255, 0.35);
}

/* ===== Tags Section ===== */
.article-tags-section {
    background: var(--bg);
    padding: 0 0 56px;
}

.article-tags {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
}

.tag-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-heading);
    margin-right: 4px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.tag-label i {
    color: var(--primary);
}

.tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    font-size: 13px;
    color: var(--text-body);
    text-decoration: none;
    transition: var(--transition);
}

.tag:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    .article-tags-section {
        padding: 0 0 40px;
    }
}

/* ===== Related Posts ===== */
.related-posts {
    background: var(--bg-white);
    padding: 64px 0;
}

.section-head {
    text-align: center;
    margin-bottom: 44px;
}

.section-head h2 {
    font-size: 30px;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.section-head p {
    color: var(--text-muted);
    font-size: 15px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.related-card {
    background: var(--bg-white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

.related-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.related-card img {
    width: 100%;
    height: 190px;
    object-fit: cover;
    display: block;
    background: var(--bg);
}

.related-card-body {
    padding: 22px 24px 24px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.related-card-body h3 {
    font-size: 17px;
    font-weight: 600;
    line-height: 1.45;
    margin-bottom: 10px;
}

.related-card-body h3 a {
    color: var(--text-heading);
    text-decoration: none;
    transition: var(--transition);
}

.related-card-body h3 a:hover {
    color: var(--primary);
}

.related-card-body p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.65;
    margin-bottom: 18px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.related-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--border-light);
}

.related-meta a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 13px;
}

.related-meta a:hover {
    text-decoration: underline;
}

@media (max-width: 1024px) {
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .related-grid {
        grid-template-columns: 1fr;
    }
    .section-head {
        margin-bottom: 32px;
    }
    .section-head h2 {
        font-size: 24px;
    }
}

/* ===== Post Return ===== */
.post-return {
    background: var(--bg-white);
    padding: 8px 0 64px;
    text-align: center;
}

.post-return-inner {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
}

.return-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-body);
    text-decoration: none;
    padding: 10px 22px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-white);
    transition: var(--transition);
}

.return-link:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
    transform: translateY(-1px);
}

.return-link i {
    color: var(--primary);
}

/* ===== CTA ===== */
.article-cta {
    padding: 88px 0;
    background: linear-gradient(75deg, rgba(24, 34, 51, 0.78), rgba(24, 34, 51, 0.68)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    text-align: center;
}

.cta-box {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 16px;
}

.cta-box h2 {
    color: #FFFFFF;
    font-size: 30px;
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.35;
    letter-spacing: 0.5px;
}

.cta-box p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 15px;
    margin-bottom: 36px;
    line-height: 1.7;
}

.btn-light {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 54px;
    padding: 0 36px;
    background: #FFFFFF;
    color: var(--primary);
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.btn-light:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.16);
    color: var(--primary-dark);
    background: #F5F8FC;
}

.btn-light:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.4);
}

.cta-note {
    margin-top: 20px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
    .article-cta {
        padding: 64px 0;
    }
    .cta-box h2 {
        font-size: 24px;
    }
    .btn-light {
        height: 48px;
        padding: 0 28px;
        font-size: 15px;
    }
}

/* ===== Footer ===== */
.site-footer {
    background: var(--bg);
    border-top: 1px solid var(--border-light);
    padding-top: 64px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-brand .brand {
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.75;
    max-width: 340px;
}

.footer-col h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 18px;
    letter-spacing: 0.3px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--primary);
    padding-left: 2px;
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 14px;
}

.footer-contact i {
    color: var(--primary);
    font-size: 13px;
    width: 18px;
    text-align: center;
}

.footer-bottom {
    background: var(--bg);
    border-top: 1px solid var(--border-light);
    padding: 20px 0;
}

.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.footer-bottom span {
    font-size: 13px;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .site-footer {
        padding-top: 48px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 36px;
        padding-bottom: 40px;
    }
    .footer-bottom .container {
        flex-direction: column;
        text-align: center;
        gap: 6px;
    }
}

/* ===== Focus Accessibility ===== */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ===== Scrollbar (subtle) ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: #C5D0DE;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* roulang page: category1 */
:root {
            --primary: #4B8DFF;
            --primary-dark: #3A7AEB;
            --primary-light: #EEF4FF;
            --accent: #FF7A59;
            --success: #17B890;
            --bg: #F5F8FC;
            --white: #FFFFFF;
            --text: #182233;
            --text-body: #3F4A5A;
            --text-muted: #6B7B8D;
            --border: #E2E9F2;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow: 0 6px 24px rgba(42, 70, 110, 0.06);
            --shadow-hover: 0 12px 32px rgba(42, 70, 110, 0.12);
            --font-cn: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
            --font-en: Inter, 'Helvetica Neue', Arial, sans-serif;
            --container: 1200px;
            --spacing-section: 96px;
            --spacing-section-md: 72px;
            --spacing-section-sm: 56px;
        }

        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-cn);
            background: var(--bg);
            color: var(--text-body);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }

        img {
            max-width: 100%;
            display: block;
        }

        ul,
        ol {
            list-style: none;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            background: rgba(255, 255, 255, 0.94);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 1px solid #E8EDF3;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .brand {
            display: flex;
            flex-direction: column;
            line-height: 1.25;
            gap: 1px;
        }

        .brand-main {
            font-size: 21px;
            font-weight: 650;
            color: var(--text);
            letter-spacing: 0.5px;
        }

        .brand-sub {
            font-size: 11px;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 3px;
            text-transform: uppercase;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .nav-toggle span {
            width: 22px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 36px;
        }

        .main-nav ul {
            display: flex;
            gap: 36px;
        }

        .main-nav ul li a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            padding: 10px 0;
            position: relative;
            transition: color 0.2s ease;
        }

        .main-nav ul li a:hover {
            color: var(--primary);
        }

        .main-nav ul li.active a {
            color: var(--primary);
            font-weight: 600;
        }

        .main-nav ul li.active a::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
        }

        .nav-login-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff !important;
            padding: 10px 22px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.25s ease;
        }

        .nav-login-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(75, 141, 255, 0.3);
        }

        .nav-login-btn:focus-visible {
            outline: 3px solid rgba(75, 141, 255, 0.35);
            outline-offset: 2px;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 44px;
            padding: 0 28px;
            border-radius: 10px;
            font-size: 15px;
            font-weight: 600;
            transition: all 0.25s ease;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(75, 141, 255, 0.25);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(75, 141, 255, 0.32);
        }

        .btn-primary:focus-visible {
            outline: 3px solid rgba(75, 141, 255, 0.35);
            outline-offset: 2px;
        }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary-light);
        }

        .btn-light {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
        }

        .btn-light:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(0, 0, 0, 0.16);
        }

        /* ===== Page Banner ===== */
        .page-banner {
            position: relative;
            background: linear-gradient(rgba(24, 34, 51, 0.58), rgba(24, 34, 51, 0.68)),
                url('/assets/images/backpic/back-2.webp') center / cover no-repeat;
            padding: 88px 0 80px;
            color: #fff;
        }

        .breadcrumb {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }

        .breadcrumb a:hover {
            color: #fff;
        }

        .breadcrumb-sep {
            opacity: 0.6;
        }

        .breadcrumb .current {
            color: #fff;
        }

        .banner-tag {
            display: inline-block;
            background: rgba(255, 255, 255, 0.14);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 20px;
            padding: 5px 16px;
            font-size: 12px;
            letter-spacing: 1px;
            margin-bottom: 20px;
        }

        .page-banner h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.3;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        .page-banner .banner-desc {
            font-size: 16px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.88);
            max-width: 620px;
            margin-bottom: 32px;
        }

        .banner-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
        }

        .banner-actions .btn-outline {
            color: #fff;
            border-color: rgba(255, 255, 255, 0.7);
            height: 44px;
        }

        .banner-actions .btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
        }

        /* ===== Section header ===== */
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }

        .section-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 1px;
            padding: 5px 16px;
            border-radius: 20px;
            margin-bottom: 14px;
        }

        .section-header h2 {
            font-size: 30px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.3;
            margin-bottom: 10px;
        }

        .section-header p {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 560px;
            margin: 0 auto;
        }

        /* ===== Intro ===== */
        .intro-section {
            padding: 96px 0 80px;
        }

        .intro-grid {
            display: grid;
            grid-template-columns: 1.05fr 0.95fr;
            gap: 56px;
            align-items: center;
        }

        .intro-copy h2 {
            font-size: 28px;
            font-weight: 600;
            color: var(--text);
            line-height: 1.35;
            margin-bottom: 18px;
        }

        .intro-copy p {
            font-size: 16px;
            line-height: 1.85;
            color: var(--text-body);
            margin-bottom: 14px;
        }

        .intro-tags {
            margin-top: 18px;
        }

        .tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary-dark);
            border-radius: 20px;
            padding: 4px 14px;
            font-size: 12px;
            font-weight: 500;
            margin: 4px 6px 4px 0;
        }

        .intro-stats {
            display: flex;
            gap: 36px;
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
        }

        .stat-item .num {
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }

        .stat-item .label {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .intro-visual {
            position: relative;
        }

        .intro-visual img {
            width: 100%;
            border-radius: 20px;
            object-fit: cover;
            box-shadow: var(--shadow);
        }

        /* ===== Methods ===== */
        .methods-section {
            padding: 0 0 96px;
        }

        .methods-grid {
            display: grid;
            grid-template-columns: repeat(12, 1fr);
            gap: 24px;
        }

        .method-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
        }

        .method-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .method-card.large {
            grid-column: span 6;
            display: flex;
            flex-direction: row;
            align-items: center;
            gap: 24px;
        }

        .method-card.small {
            grid-column: span 3;
        }

        .method-card.wide {
            grid-column: span 6;
        }

        .method-card-body {
            flex: 1;
        }

        .method-card-media {
            width: 200px;
            height: 134px;
            border-radius: 12px;
            overflow: hidden;
            flex-shrink: 0;
            background: var(--bg);
        }

        .method-card-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .method-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 18px;
            transition: background 0.3s ease, color 0.3s ease;
        }

        .method-card:hover .method-icon {
            background: #fff;
            color: var(--accent);
        }

        .method-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .method-card p {
            font-size: 14px;
            line-height: 1.75;
            color: var(--text-muted);
            margin-bottom: 14px;
        }

        .method-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            margin-top: auto;
        }

        .method-link i {
            transition: transform 0.2s ease;
        }

        .method-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Steps ===== */
        .steps-section {
            background: var(--white);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            padding: 96px 0;
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 48px;
            max-width: 960px;
            margin: 0 auto;
        }

        .step-item {
            text-align: center;
            padding: 28px 16px 12px;
        }

        .step-num {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 18px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-family: var(--font-en);
        }

        .step-item h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 10px;
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.75;
            max-width: 240px;
            margin: 0 auto;
        }

        /* ===== Scenarios ===== */
        .scenarios-section {
            padding: 96px 0;
        }

        .scenarios-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .scenario-card {
            display: flex;
            gap: 18px;
            padding: 28px 24px;
            background: var(--white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            border: 1px solid rgba(226, 233, 242, 0.6);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .scenario-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .scenario-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }

        .scenario-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 6px;
        }

        .scenario-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 96px 0;
            background: var(--white);
            border-top: 1px solid var(--border);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border);
        }

        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }

        .faq-q {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            text-align: left;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            padding: 22px 4px;
            background: none;
            transition: color 0.2s ease;
        }

        .faq-q:hover {
            color: var(--primary);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            flex-shrink: 0;
            transition: transform 0.3s ease, background 0.3s ease;
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
        }

        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.8;
            padding: 0 4px;
        }

        .faq-item.active .faq-a {
            padding-bottom: 22px;
        }

        .faq-a p {
            margin-bottom: 8px;
        }

        /* ===== CTA ===== */
        .cta-section {
            position: relative;
            padding: 96px 0;
            background: linear-gradient(rgba(24, 34, 51, 0.72), rgba(24, 34, 51, 0.76)),
                url('/assets/images/backpic/back-1.webp') center / cover no-repeat;
            text-align: center;
            color: #fff;
        }

        .cta-section h2 {
            font-size: 30px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
        }

        .cta-section p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.78);
            margin-bottom: 30px;
        }

        .cta-section .btn-light {
            font-size: 16px;
            height: 52px;
            padding: 0 36px;
            margin-bottom: 20px;
        }

        .cta-trust {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.55);
            letter-spacing: 0.5px;
            margin-bottom: 28px;
        }

        .cat-switch {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
        }

        .cat-switch a {
            display: inline-block;
            padding: 5px 14px;
            border: 1px solid rgba(255, 255, 255, 0.35);
            border-radius: 20px;
            color: rgba(255, 255, 255, 0.85);
            transition: all 0.2s ease;
        }

        .cat-switch a:hover {
            background: rgba(255, 255, 255, 0.14);
            border-color: #fff;
            color: #fff;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg);
            border-top: 1px solid var(--border);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 0.8fr 1fr;
            gap: 48px;
            padding: 64px 0 48px;
        }

        .footer-brand .brand {
            margin-bottom: 16px;
        }

        .footer-brand p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.75;
            max-width: 340px;
        }

        .footer-col h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 18px;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-muted);
        }

        .footer-col ul li a:hover {
            color: var(--primary);
        }

        .footer-contact li {
            font-size: 14px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-contact li i {
            width: 18px;
            color: var(--primary);
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid var(--border);
            padding: 20px 0;
        }

        .footer-bottom .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .container {
                padding: 0 20px;
            }

            .intro-grid {
                gap: 36px;
            }

            .method-card.large {
                grid-column: span 12;
            }

            .method-card.small {
                grid-column: span 6;
            }

            .method-card.wide {
                grid-column: span 12;
            }

            .scenarios-grid {
                gap: 16px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: var(--spacing-section-sm);
            }

            .nav-toggle {
                display: flex;
            }

            .main-nav {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: #fff;
                flex-direction: column;
                align-items: flex-start;
                gap: 28px;
                padding: 28px 24px 36px;
                box-shadow: 0 16px 40px rgba(42, 70, 110, 0.14);
                transform: translateY(-16px);
                opacity: 0;
                pointer-events: none;
                transition: opacity 0.3s ease, transform 0.3s ease;
                border-bottom: 1px solid var(--border);
            }

            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }

            .main-nav ul {
                flex-direction: column;
                gap: 24px;
                width: 100%;
            }

            .main-nav ul li a {
                display: block;
                font-size: 18px;
                padding: 6px 0;
            }

            .main-nav ul li.active a::after {
                bottom: 2px;
            }

            .nav-login-btn {
                align-self: flex-start;
                margin-top: 4px;
            }

            .header-inner {
                height: 64px;
            }

            .page-banner {
                padding: 64px 0 56px;
            }

            .page-banner h1 {
                font-size: 28px;
            }

            .page-banner .banner-desc {
                font-size: 15px;
            }

            .banner-actions {
                flex-direction: column;
                align-items: stretch;
            }

            .banner-actions .btn {
                width: 100%;
            }

            .intro-section,
            .methods-section,
            .steps-section,
            .scenarios-section,
            .faq-section,
            .cta-section {
                padding-top: 56px;
                padding-bottom: 56px;
            }

            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .intro-visual img {
                width: 100%;
            }

            .methods-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .method-card,
            .method-card.large,
            .method-card.small,
            .method-card.wide {
                grid-column: span 1;
            }

            .method-card.large {
                flex-direction: column;
                align-items: flex-start;
            }

            .method-card-media {
                width: 100%;
                height: 180px;
            }

            .steps-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .scenarios-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .scenario-card {
                padding: 20px 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
                padding: 48px 0 32px;
            }

            .footer-bottom .container {
                flex-direction: column;
                text-align: center;
                gap: 4px;
            }

            .cat-switch {
                gap: 6px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .page-banner h1 {
                font-size: 24px;
            }

            .section-header h2 {
                font-size: 24px;
            }

            .method-card h3 {
                font-size: 17px;
            }

            .intro-stats {
                flex-wrap: wrap;
                gap: 20px;
            }

            .stat-item {
                min-width: calc(50% - 10px);
            }

            .stat-item .num {
                font-size: 26px;
            }

            .cta-section h2 {
                font-size: 24px;
            }

            .btn-light {
                width: 100%;
            }

            .cat-switch a {
                padding: 4px 10px;
                font-size: 12px;
            }
        }

/* roulang page: category2 */
/* ========== 设计变量 ========== */
        :root {
            --primary: #4B8DFF;
            --primary-dark: #3A76E8;
            --primary-light: #EEF4FF;
            --accent: #FF7A59;
            --accent-light: #FFF1ED;
            --success: #17B890;
            --success-light: #E6F9F3;
            --bg: #F5F8FC;
            --white: #FFFFFF;
            --text-title: #182233;
            --text-body: #3F4A5A;
            --text-muted: #6B7B8D;
            --border: #E2E9F2;
            --border-light: #E8EDF3;
            --radius-card: 16px;
            --radius-btn: 10px;
            --shadow-sm: 0 4px 16px rgba(42, 70, 110, 0.05);
            --shadow-md: 0 6px 24px rgba(42, 70, 110, 0.06);
            --shadow-lg: 0 12px 32px rgba(42, 70, 110, 0.12);
            --spacing-section: 96px;
            --font-main: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Inter", "Helvetica Neue", Arial, sans-serif;
            --font-en: "Inter", "Helvetica Neue", Arial, sans-serif;
            --container-width: 1200px;
        }

        /* ========== 基础 Reset ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-main);
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-body);
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

        a:hover {
            color: var(--primary-dark);
        }

        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ========== 容器 ========== */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== 导航栏 ========== */
        .site-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .site-header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }

        .brand {
            display: flex;
            flex-direction: column;
            line-height: 1.2;
            gap: 2px;
        }

        .brand-main {
            font-size: 18px;
            font-weight: 650;
            color: var(--text-title);
            letter-spacing: 0.5px;
        }

        .brand-sub {
            font-size: 11px;
            font-weight: 400;
            color: var(--text-muted);
            letter-spacing: 2px;
            text-transform: uppercase;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .main-nav>ul {
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .main-nav>ul>li {
            position: relative;
        }

        .main-nav>ul>li>a {
            display: block;
            padding: 20px 16px 18px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            border-bottom: 2px solid transparent;
            transition: color 0.2s ease, border-color 0.2s ease;
        }

        .main-nav>ul>li>a:hover {
            color: var(--primary);
            border-bottom-color: var(--primary-light);
        }

        .main-nav>ul>li.active>a {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }

        .main-nav>ul>li.active>a::before {
            content: "";
            display: inline-block;
            width: 6px;
            height: 6px;
            background: var(--primary);
            border-radius: 50%;
            margin-right: 6px;
            vertical-align: 2px;
        }

        .nav-login-btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            height: 38px;
            padding: 0 20px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 500;
            transition: background 0.2s ease, transform 0.2s ease;
        }

        .nav-login-btn:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
        }

        /* 移动端导航 */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-title);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .nav-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ========== 面包屑 ========== */
        .breadcrumb-bar {
            background: var(--white);
            border-bottom: 1px solid var(--border-light);
            padding: 12px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .breadcrumb a {
            color: var(--text-muted);
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb .sep {
            color: #C3CFDC;
        }

        .breadcrumb .current {
            color: var(--text-body);
            font-weight: 500;
        }

        /* ========== Hero / 分类横幅 ========== */
        .category-hero {
            position: relative;
            padding: 72px 0 64px;
            background: linear-gradient(135deg, #F0F6FF 0%, #F7FAFE 40%, #EDF3FA 100%);
            overflow: hidden;
        }

        .category-hero::before {
            content: "";
            position: absolute;
            right: -60px;
            top: -60px;
            width: 260px;
            height: 260px;
            background: rgba(75, 141, 255, 0.08);
            border-radius: 50%;
            pointer-events: none;
        }

        .category-hero::after {
            content: "";
            position: absolute;
            left: 40%;
            bottom: -80px;
            width: 200px;
            height: 200px;
            background: rgba(255, 122, 89, 0.04);
            border-radius: 50%;
            pointer-events: none;
        }

        .category-hero-inner {
            position: relative;
            z-index: 1;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }

        .category-hero-text .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 5px 14px;
            font-size: 12px;
            color: var(--primary);
            box-shadow: var(--shadow-sm);
            margin-bottom: 20px;
        }

        .category-hero-text h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-title);
            letter-spacing: -0.5px;
            margin-bottom: 18px;
        }

        .category-hero-text h1 .highlight {
            color: var(--primary);
        }

        .category-hero-text p {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-muted);
            max-width: 480px;
            margin-bottom: 28px;
        }

        .hero-cta-group {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 46px;
            padding: 0 26px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            transition: all 0.25s ease;
            cursor: pointer;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(75, 141, 255, 0.25);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(75, 141, 255, 0.35);
        }

        .btn-primary:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(75, 141, 255, 0.35);
        }

        .btn-outline {
            background: var(--white);
            color: var(--primary);
            border: 1px solid var(--primary);
        }

        .btn-outline:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-outline:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(75, 141, 255, 0.25);
        }

        .hero-trust-row {
            display: flex;
            align-items: center;
            gap: 18px;
            margin-top: 20px;
            flex-wrap: wrap;
        }

        .hero-trust-row span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 12px;
            color: var(--text-muted);
        }

        .hero-trust-row span i {
            color: var(--success);
            font-size: 13px;
        }

        /* Hero 右侧：登录安全示意图卡 */
        .category-hero-card {
            background: var(--white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-md);
            padding: 24px;
            border: 1px solid var(--border);
            position: relative;
        }

        .category-hero-card .card-cover {
            height: 140px;
            border-radius: 12px;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            position: relative;
            margin-bottom: 20px;
            overflow: hidden;
        }

        .category-hero-card .card-cover::after {
            content: "";
            position: absolute;
            inset: 0;
            background: rgba(75, 141, 255, 0.15);
        }

        .category-hero-card .card-cover .cover-text {
            position: absolute;
            bottom: 12px;
            left: 16px;
            z-index: 2;
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .card-form-group {
            margin-bottom: 14px;
        }

        .card-form-group label {
            display: block;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-body);
            margin-bottom: 6px;
        }

        .card-form-group input {
            width: 100%;
            height: 40px;
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 0 12px;
            font-size: 14px;
            background: var(--bg);
            transition: border-color 0.2s;
        }

        .card-form-group input:focus {
            outline: none;
            border-color: var(--primary);
            background: #fff;
            box-shadow: 0 0 0 3px rgba(75, 141, 255, 0.12);
        }

        .card-login-btn {
            width: 100%;
            height: 42px;
            background: var(--primary);
            color: #fff;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            margin-top: 6px;
        }

        .card-login-btn:hover {
            background: var(--primary-dark);
        }

        .card-form-footer {
            display: flex;
            justify-content: space-between;
            margin-top: 12px;
            font-size: 12px;
        }

        .card-form-footer a {
            color: var(--primary);
        }

        .card-form-footer a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .card-secure-badge {
            position: absolute;
            top: -10px;
            right: 18px;
            background: var(--success-light);
            border: 1px solid rgba(23, 184, 144, 0.25);
            color: var(--success);
            border-radius: 18px;
            padding: 3px 12px;
            font-size: 12px;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            box-shadow: var(--shadow-sm);
        }

        /* ========== 板块通用 ========== */
        .section {
            padding: var(--spacing-section) 0;
        }

        .section-inner {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header .section-overline {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-light);
            border-radius: 20px;
            padding: 4px 14px;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }

        .section-header h2 {
            font-size: 30px;
            font-weight: 600;
            color: var(--text-title);
            line-height: 1.3;
            margin-bottom: 10px;
        }

        .section-header .section-desc {
            font-size: 15px;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto;
        }

        /* ========== 安全功能错落网格 ========== */
        .security-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            grid-template-rows: auto auto;
            gap: 24px;
        }

        .security-card {
            background: var(--white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }

        .security-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }

        .security-card .icon-box {
            width: 48px;
            height: 48px;
            background: var(--primary-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--primary);
            margin-bottom: 16px;
            transition: background 0.3s, color 0.3s;
        }

        .security-card:hover .icon-box {
            background: var(--accent-light);
            color: var(--accent);
        }

        .security-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 8px;
        }

        .security-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .security-card.card-wide {
            grid-column: span 2;
            display: flex;
            flex-direction: column;
            justify-content: center;
            background: linear-gradient(145deg, #FAFCFF 0%, #FFFFFF 60%);
            border: 1px solid var(--border);
        }

        .security-card.card-wide .card-tip {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            margin-top: 12px;
            background: var(--primary-light);
            border-radius: 10px;
            padding: 12px 16px;
            font-size: 13px;
            color: var(--text-body);
            transition: background 0.2s;
        }

        .security-card.card-wide .card-tip i {
            color: var(--primary);
            margin-top: 3px;
            flex-shrink: 0;
        }

        .security-card.card-wide:hover {
            background: linear-gradient(145deg, #F6FAFF 0%, #FFFFFF 60%);
        }

        .security-card.card-accent {
            border-top: 3px solid var(--accent);
        }

        /* ========== 常见安全场景 ========== */
        .scenario-section {
            background: var(--white);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }

        .scenario-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .scenario-visual {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            position: relative;
        }

        .scenario-visual img {
            width: 100%;
            height: 340px;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .scenario-visual:hover img {
            transform: scale(1.02);
        }

        .scenario-list {
            display: flex;
            flex-direction: column;
            gap: 0;
        }

        .scenario-item {
            display: flex;
            gap: 18px;
            padding: 20px 0;
            border-bottom: 1px solid var(--border-light);
        }

        .scenario-item:last-child {
            border-bottom: none;
        }

        .scenario-item .scenario-num {
            width: 36px;
            height: 36px;
            background: var(--primary-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            flex-shrink: 0;
        }

        .scenario-item:nth-child(2n) .scenario-num {
            background: var(--accent-light);
            color: var(--accent);
        }

        .scenario-item h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 4px;
        }

        .scenario-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ========== 操作流程 ========== */
        .process-section .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 40px;
            position: relative;
        }

        .process-steps::before {
            content: "";
            position: absolute;
            top: 24px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: var(--border);
            z-index: 0;
        }

        .process-step {
            position: relative;
            z-index: 1;
            text-align: center;
            background: var(--bg);
            border-radius: var(--radius-card);
            padding: 32px 20px 24px;
            transition: background 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
        }

        .process-step:hover {
            background: var(--white);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        .process-step .step-dot {
            width: 48px;
            height: 48px;
            background: var(--white);
            border: 2px solid var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            color: var(--primary);
            margin: 0 auto 16px;
            box-shadow: var(--shadow-sm);
        }

        .process-step:nth-child(2n) .step-dot {
            border-color: var(--accent);
            color: var(--accent);
        }

        .process-step h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 8px;
        }

        .process-step p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ========== 图文交替区 ========== */
        .feature-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 56px;
            align-items: center;
        }

        .feature-block+.feature-block {
            margin-top: 80px;
        }

        .feature-block.reverse .feature-image {
            order: 2;
        }

        .feature-image {
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .feature-image img {
            width: 100%;
            height: 300px;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .feature-image:hover img {
            transform: scale(1.02);
        }

        .feature-content h2 {
            font-size: 26px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 14px;
            line-height: 1.35;
        }

        .feature-content p {
            font-size: 15px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

        .feature-content ul {
            margin-top: 12px;
        }

        .feature-content ul li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text-body);
            margin-bottom: 8px;
        }

        .feature-content ul li i {
            color: var(--success);
            margin-top: 5px;
            flex-shrink: 0;
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: var(--white);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-light);
        }

        .faq-item:first-child {
            border-top: 1px solid var(--border-light);
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            padding: 22px 4px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-title);
            cursor: pointer;
            text-align: left;
            transition: color 0.2s;
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question .faq-icon {
            position: relative;
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            margin-left: 12px;
        }

        .faq-question .faq-icon::before,
        .faq-question .faq-icon::after {
            content: "";
            position: absolute;
            background: var(--primary);
            border-radius: 2px;
            transition: transform 0.3s ease;
        }

        .faq-question .faq-icon::before {
            width: 2px;
            height: 20px;
            left: 9px;
            top: 0;
        }

        .faq-question .faq-icon::after {
            width: 20px;
            height: 2px;
            left: 0;
            top: 9px;
        }

        .faq-item.open .faq-question .faq-icon::before {
            transform: rotate(90deg);
            opacity: 0;
        }

        .faq-item.open .faq-question .faq-icon::after {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 4px;
        }

        .faq-answer-inner {
            padding-bottom: 20px;
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
        }

        /* ========== CTA 区块 ========== */
        .security-cta {
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            position: relative;
            padding: 88px 0;
            text-align: center;
        }

        .security-cta::before {
            content: "";
            position: absolute;
            inset: 0;
            background: rgba(24, 34, 51, 0.72);
        }

        .security-cta .cta-content {
            position: relative;
            z-index: 2;
            max-width: 640px;
            margin: 0 auto;
        }

        .security-cta h2 {
            font-size: 30px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
            line-height: 1.3;
        }

        .security-cta p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 28px;
            line-height: 1.7;
        }

        .btn-light {
            background: #fff;
            color: var(--primary);
            font-weight: 600;
            height: 52px;
            padding: 0 36px;
            font-size: 16px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }

        .btn-light:hover {
            background: var(--primary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .cta-note {
            margin-top: 16px;
            font-size: 12px;
            color: rgba(255, 255, 255, 0.5);
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--white);
            border-top: 1px solid var(--border-light);
            padding-top: 56px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr;
            gap: 56px;
            padding-bottom: 44px;
        }

        .footer-brand .brand {
            margin-bottom: 14px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 340px;
        }

        .footer-col h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 18px;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color 0.2s;
        }

        .footer-col ul li a:hover {
            color: var(--primary);
        }

        .footer-contact li {
            font-size: 14px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-contact li i {
            color: var(--primary);
            font-size: 13px;
            width: 16px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-light);
            padding: 18px 0;
        }

        .footer-bottom .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer-bottom span {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            :root {
                --spacing-section: 72px;
            }

            .category-hero {
                padding: 56px 0 48px;
            }

            .category-hero-inner {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }

            .category-hero-text h1 {
                font-size: 32px;
            }

            .security-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .process-steps {
                grid-template-columns: repeat(2, 1fr) !important;
                gap: 16px;
            }

            .process-steps::before {
                display: none;
            }

            .scenario-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .feature-block {
                grid-template-columns: 1fr;
                gap: 36px;
            }

            .feature-block.reverse .feature-image {
                order: 0;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 56px;
            }

            .container,
            .section-inner {
                padding: 0 16px;
            }

            .site-header-inner {
                height: 58px;
            }

            .main-nav {
                position: fixed;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: var(--white);
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 28px;
                z-index: 99;
                opacity: 0;
                visibility: hidden;
                transition: opacity 0.3s ease, visibility 0.3s ease;
            }

            .main-nav.open {
                opacity: 1;
                visibility: visible;
            }

            .main-nav>ul {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }

            .main-nav>ul>li>a {
                font-size: 18px;
                padding: 10px 20px;
                border-bottom: none;
            }

            .main-nav>ul>li.active>a {
                background: var(--primary-light);
                border-radius: 24px;
                border-bottom-color: transparent;
            }

            .main-nav>ul>li.active>a::before {
                display: none;
            }

            .nav-login-btn {
                margin-top: 10px;
            }

            .nav-toggle {
                display: flex;
                position: relative;
                z-index: 100;
            }

            .brand-main {
                font-size: 16px;
            }

            .brand-sub {
                font-size: 9px;
                letter-spacing: 1.5px;
            }

            .category-hero {
                padding: 40px 0 48px;
            }

            .category-hero-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .category-hero-text h1 {
                font-size: 28px;
            }

            .category-hero-text p {
                font-size: 15px;
            }

            .hero-cta-group .btn {
                flex: 1 1 auto;
                padding: 0 18px;
            }

            .category-hero-card {
                padding: 18px;
            }

            .security-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }

            .security-card.card-wide {
                grid-column: span 1;
            }

            .section-header h2 {
                font-size: 24px;
            }

            .process-steps {
                grid-template-columns: 1fr !important;
            }

            .process-step {
                background: var(--white);
                box-shadow: var(--shadow-sm);
            }

            .scenario-visual img {
                height: 220px;
            }

            .feature-image img {
                height: 200px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                padding-bottom: 28px;
            }

            .footer-bottom .container {
                flex-direction: column;
                text-align: center;
            }

            .security-cta {
                padding: 64px 0;
                background-attachment: scroll;
            }

            .security-cta h2 {
                font-size: 24px;
            }

            .btn-light {
                height: 48px;
                padding: 0 28px;
                font-size: 15px;
            }
        }

        @media (max-width: 520px) {
            .category-hero-text h1 {
                font-size: 24px;
            }

            .hero-cta-group {
                flex-direction: column;
                align-items: stretch;
            }

            .hero-trust-row {
                gap: 10px;
            }

            .security-card {
                padding: 20px;
            }

            .scenario-item {
                gap: 12px;
                padding: 16px 0;
            }
        }