/* roulang page: index */
:root {
    --primary: #1D63ED;
    --primary-dark: #1550C7;
    --primary-deeper: #0D3587;
    --neon: #00E0FF;
    --neon-light: #33EAFF;
    --bg: #F5F9FF;
    --surface: #FFFFFF;
    --dark-bg: #0A1428;
    --dark-secondary: #101D38;
    --text: #101C33;
    --text-secondary: #55657E;
    --text-muted: #8296B0;
    --border: #DFE9F5;
    --success: #12B76A;
    --warning: #F79009;
    --error: #F04438;
    --radius-card: 14px;
    --radius-btn: 10px;
    --radius-input: 8px;
    --radius-badge: 6px;
    --shadow-card: 0 8px 24px rgba(11, 31, 74, 0.06);
    --shadow-hover: 0 14px 34px rgba(11, 31, 74, 0.10);
    --shadow-panel: 0 20px 50px rgba(11, 31, 74, 0.18);
    --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
    --space-section: 96px;
    --space-section-mobile: 56px;
    --container-max: 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-stack);
    font-size: 16px;
    line-height: 1.75;
    color: var(--text);
    background: var(--bg);
    overflow-x: hidden;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 10px;
}
a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: var(--primary-dark);
}
ul,
ol {
    list-style: none;
}
button,
input,
select,
textarea {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
    background: none;
}
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}
.section {
    padding: var(--space-section) 0;
}
.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 48px;
}
.section-header h2 {
    font-size: clamp(26px, 3.5vw, 40px);
    font-weight: 800;
    line-height: 1.3;
    color: var(--text);
    letter-spacing: 0.2px;
}
.section-header p {
    margin-top: 14px;
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
}
/* ============ NAV ============ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 72px;
    background: var(--dark-bg);
    border-bottom: 2px solid var(--neon);
    box-shadow: 0 4px 20px rgba(10, 20, 40, 0.35);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-weight: 800;
    font-size: 17px;
    letter-spacing: 0.3px;
    white-space: nowrap;
    transition: opacity 0.2s;
}
.nav-logo:hover {
    opacity: 0.88;
}
.nav-logo-icon {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--neon), #007BFF);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: #fff;
    font-weight: 900;
    box-shadow: 0 0 14px rgba(0, 224, 255, 0.4);
    flex-shrink: 0;
}
.nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
    height: 100%;
}
.nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    height: 100%;
    color: rgba(255, 255, 255, 0.85);
    font-size: 15px;
    font-weight: 500;
    padding: 0 4px;
    transition: color 0.25s;
    white-space: nowrap;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--neon);
    opacity: 0;
    transform: scaleX(0.4);
    transition: opacity 0.3s, transform 0.3s;
    box-shadow: 0 0 12px rgba(0, 224, 255, 0.5);
}
.nav-link:hover {
    color: #fff;
}
.nav-link:hover::after,
.nav-link.active::after {
    opacity: 1;
    transform: scaleX(1);
}
.nav-link.active {
    color: #fff;
}
.nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 22px;
    background: var(--neon);
    color: var(--dark-bg);
    font-weight: 700;
    font-size: 15px;
    border-radius: 8px;
    transition: box-shadow 0.3s, background 0.3s, transform 0.2s;
    white-space: nowrap;
}
.nav-cta:hover {
    background: var(--neon-light);
    color: var(--dark-bg);
    box-shadow: 0 0 20px rgba(0, 224, 255, 0.45);
    transform: translateY(-1px);
}
.hamburger {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 8px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.1);
}
.hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: #fff;
    margin: 3px 0;
    border-radius: 2px;
    transition: all 0.3s;
}
.hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}
.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--dark-bg);
    border-bottom: 2px solid var(--neon);
    padding: 12px 24px 24px;
    z-index: 999;
    box-shadow: 0 20px 40px rgba(10,20,40,0.5);
}
.mobile-menu a {
    display: block;
    padding: 14px 0;
    color: rgba(255,255,255,0.9);
    font-size: 16px;
    font-weight: 500;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    min-height: 44px;
    line-height: 44px;
}
.mobile-menu a:last-child {
    border-bottom: none;
}
.mobile-menu a:hover {
    color: var(--neon);
}
/* ============ HERO ============ */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, rgba(245, 249, 255, 0.94) 0%, rgba(255, 255, 255, 0.88) 100%),
        url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
    padding: 120px 0 80px;
}
.hero-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 56px;
    align-items: center;
}
.hero-content {
    max-width: 540px;
}
.hero-content h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.25;
    color: var(--text);
    letter-spacing: 0.5px;
    margin-bottom: 20px;
}
.hero-content h1 .highlight {
    color: var(--primary);
    position: relative;
}
.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 24px;
    border-radius: var(--radius-btn);
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.25s ease;
    text-decoration: none;
    border: 1px solid transparent;
    line-height: 1;
}
.btn-lg {
    height: 56px;
    padding: 0 36px;
    font-size: 16px;
    border-radius: 12px;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 6px 16px rgba(29, 99, 237, 0.3);
}
.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: 0 8px 22px rgba(29, 99, 237, 0.4);
    transform: translateY(-2px);
}
.btn-primary:focus-visible {
    outline: 3px solid rgba(29, 99, 237, 0.25);
    outline-offset: 2px;
}
.btn-neon {
    background: var(--neon);
    color: var(--dark-bg);
    box-shadow: 0 4px 12px rgba(0, 224, 255, 0.3);
}
.btn-neon:hover {
    background: var(--neon-light);
    color: var(--dark-bg);
    box-shadow: 0 0 24px rgba(0, 224, 255, 0.5);
    transform: translateY(-2px);
}
.btn-ghost {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}
.btn-ghost:hover {
    background: rgba(29, 99, 237, 0.06);
    color: var(--primary-dark);
    transform: translateY(-2px);
}
.hero-trust {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
}
.hero-trust li {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}
.hero-trust li svg,
.hero-trust li .check {
    width: 16px;
    height: 16px;
    color: var(--success);
    flex-shrink: 0;
}
/* 登录面板 */
.login-panel {
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 16px;
    box-shadow: var(--shadow-panel);
    padding: 36px 32px;
    max-width: 420px;
    width: 100%;
    margin-left: auto;
    position: relative;
}
.login-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 24px;
    right: 24px;
    height: 3px;
    background: linear-gradient(90deg, var(--neon), var(--primary));
    border-radius: 3px;
}
.login-panel-header {
    text-align: center;
    margin-bottom: 28px;
}
.login-panel-header .brand-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--neon), var(--primary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
    box-shadow: 0 0 20px rgba(0, 224, 255, 0.3);
}
.login-panel-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text);
}
.login-panel-header p {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}
.form-group {
    margin-bottom: 18px;
}
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}
.form-control {
    width: 100%;
    height: 44px;
    padding: 0 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-input);
    background: #fff;
    font-size: 14px;
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(29, 99, 237, 0.15);
}
.form-control::placeholder {
    color: var(--text-muted);
}
.login-panel .btn {
    width: 100%;
    margin-top: 8px;
}
.login-panel-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 16px;
    font-size: 13px;
}
.login-panel-footer a {
    color: var(--primary);
}
.login-panel-footer a:hover {
    color: var(--primary-dark);
}
/* ============ STEPS ============ */
.steps-section {
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    position: relative;
}
.steps-grid::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 15%;
    right: 15%;
    height: 2px;
    border-top: 2px dashed var(--neon);
    opacity: 0.5;
}
.step-item {
    position: relative;
    text-align: center;
    padding: 32px 24px;
    background: var(--surface);
    border-radius: var(--radius-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-card);
    transition: transform 0.3s, box-shadow 0.3s;
    z-index: 1;
}
.step-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.step-number {
    font-size: 48px;
    font-weight: 300;
    color: var(--neon);
    line-height: 1.2;
    display: block;
    margin-bottom: 14px;
    text-shadow: 0 0 18px rgba(0, 224, 255, 0.25);
}
.step-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    border-radius: 14px;
    background: rgba(29, 99, 237, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}
.step-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}
.step-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}
/* ============ CASES ============ */
.cases-section {
    background: var(--bg);
}
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.case-card {
    background: var(--surface);
    border-radius: var(--radius-card);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-card);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}
.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}
.case-card-cover {
    height: 200px;
    background: var(--border) center center / cover no-repeat;
    position: relative;
    overflow: hidden;
}
.case-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0;
}
.case-card-body {
    padding: 24px;
}
.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(29, 99, 237, 0.08);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-badge);
    margin-bottom: 10px;
}
.case-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}
.case-metric {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}
/* ============ NEWS ============ */
.news-section {
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.news-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 16px;
}
.news-header h2 {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 800;
    margin: 0;
}
.news-all-link {
    font-size: 14px;
    color: var(--primary);
    font-weight: 600;
    white-space: nowrap;
}
.news-all-link:hover {
    color: var(--primary-dark);
}
.news-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.news-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 20px 24px;
    box-shadow: var(--shadow-card);
    transition: transform 0.25s, box-shadow 0.25s;
}
.news-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-hover);
}
.news-item-badge {
    padding: 4px 10px;
    background: rgba(29, 99, 237, 0.08);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-badge);
    white-space: nowrap;
    flex-shrink: 0;
}
.news-item-content {
    flex: 1;
    min-width: 0;
}
.news-item-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
    line-height: 1.5;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.news-item-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.news-item-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
    flex-shrink: 0;
}
.news-item-link {
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
}
.news-empty {
    border: 2px dashed var(--border);
    border-radius: var(--radius-card);
    padding: 48px 24px;
    text-align: center;
    background: rgba(245, 249, 255, 0.6);
}
.news-empty .empty-icon {
    font-size: 36px;
    margin-bottom: 12px;
}
.news-empty h3 {
    font-size: 16px;
    color: var(--text);
    margin-bottom: 4px;
}
.news-empty p {
    font-size: 14px;
    color: var(--text-muted);
}
/* ============ FAQ ============ */
.faq-section {
    background: var(--bg);
}
.faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.faq-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: box-shadow 0.25s;
}
.faq-item:hover {
    box-shadow: var(--shadow-card);
}
.faq-item.active {
    border-color: rgba(0, 224, 255, 0.5);
    box-shadow: 0 8px 24px rgba(11, 31, 74, 0.08);
}
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    border-left: 3px solid transparent;
    transition: border-color 0.3s;
    user-select: none;
}
.faq-item.active .faq-question {
    border-left-color: var(--neon);
}
.faq-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    position: relative;
    border-radius: 50%;
    background: rgba(29, 99, 237, 0.08);
}
.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--primary);
    border-radius: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.3s;
}
.faq-icon::before {
    width: 10px;
    height: 2px;
}
.faq-icon::after {
    width: 2px;
    height: 10px;
}
.faq-item.active .faq-icon::after {
    transform: translate(-50%, -50%) scaleY(0);
}
.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}
.faq-item.active .faq-answer {
    padding: 0 24px 20px;
    max-height: 320px;
}
.faq-answer p {
    margin: 0;
}
/* ============ CTA ============ */
.cta-section {
    position: relative;
    background: var(--dark-bg) center center / cover no-repeat;
    background-image: linear-gradient(135deg, rgba(10, 20, 40, 0.92), rgba(10, 20, 40, 0.85)),
        url('/assets/images/backpic/back-2.webp');
    padding: 72px 0;
    border-top: 1px solid rgba(0, 224, 255, 0.4);
    border-bottom: 1px solid rgba(0, 224, 255, 0.4);
}
.cta-banner {
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
}
.cta-banner h2 {
    font-size: clamp(26px, 4vw, 38px);
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
    line-height: 1.3;
}
.cta-banner p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    margin-bottom: 32px;
}
.cta-banner .btn {
    box-shadow: 0 0 24px rgba(0, 224, 255, 0.35);
}
/* ============ FOOTER ============ */
.site-footer {
    background: var(--dark-bg);
    padding: 64px 0 0;
    color: rgba(255, 255, 255, 0.7);
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.footer-brand .footer-logo {
    font-size: 18px;
    font-weight: 800;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.6);
}
.footer-brand .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    padding: 6px 12px;
    background: rgba(0, 224, 255, 0.1);
    color: var(--neon);
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-badge);
}
.footer-col h4 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}
.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-col a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    transition: color 0.2s;
}
.footer-col a:hover {
    color: var(--neon);
}
.footer-contact-list li {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}
/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .hero-content {
        max-width: 100%;
        text-align: center;
        margin: 0 auto;
    }
    .hero-actions,
    .hero-trust {
        justify-content: center;
    }
    .login-panel {
        margin: 0 auto;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    .hamburger {
        display: flex;
    }
    .nav-cta {
        display: none;
    }
    .mobile-menu {
        display: block;
    }
    .section {
        padding: var(--space-section-mobile) 0;
    }
    .steps-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .steps-grid::before {
        display: none;
    }
    .cases-grid {
        grid-template-columns: 1fr;
    }
    .news-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding: 18px;
    }
    .news-item-meta {
        width: 100%;
        justify-content: space-between;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .hero {
        padding-top: 100px;
    }
}
@media (max-width: 520px) {
    .container {
        padding: 0 16px;
    }
    .hero-subtitle {
        font-size: 16px;
    }
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    .hero-actions .btn {
        width: 100%;
    }
    .login-panel {
        padding: 28px 20px;
    }
    .case-card-cover {
        height: 160px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .section-header h2 {
        font-size: 24px;
    }
}
/* ============ ACCESSIBILITY ============ */
a:focus-visible,
button:focus-visible {
    outline: 3px solid rgba(29, 99, 237, 0.35);
    outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* roulang page: article */
:root {
    --primary: #1D63ED;
    --primary-dark: #1550C7;
    --primary-deeper: #0D3587;
    --accent: #00E0FF;
    --accent-light: #33EAFF;
    --bg: #F5F9FF;
    --surface: #FFFFFF;
    --dark: #0A1428;
    --dark-panel: #101D38;
    --text: #101C33;
    --text-secondary: #55657E;
    --text-muted: #8296B0;
    --border: #DFE9F5;
    --success: #12B76A;
    --warning: #F79009;
    --error: #F04438;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 8px;
    --shadow-card: 0 8px 24px rgba(11,31,74,0.06);
    --shadow-hover: 0 14px 34px rgba(11,31,74,0.10);
    --font-main: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
}
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-main);
    background: var(--bg);
    color: var(--text);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
a {
    color: var(--primary);
    text-decoration: none;
    transition: color .2s ease, box-shadow .2s ease;
}
a:hover {
    color: var(--primary-dark);
}
img {
    max-width: 100%;
    display: block;
    border-radius: 12px;
}
button, input, select, textarea {
    font-family: inherit;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
/* ===== Header & Nav ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: var(--dark);
    border-bottom: 2px solid var(--accent);
    height: 72px;
    display: flex;
    align-items: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    width: 100%;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 0.2px;
    white-space: nowrap;
}
.nav-logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 800;
    box-shadow: 0 0 12px rgba(0,224,255,0.35);
}
.nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
}
.nav-link {
    position: relative;
    color: rgba(255,255,255,0.85);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 2px;
    line-height: 1.4;
    transition: color .2s ease;
    white-space: nowrap;
}
.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -18px;
    width: 100%;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    opacity: 0;
    transform: scaleX(0);
    transition: transform .3s ease, opacity .3s ease;
    box-shadow: 0 0 12px rgba(0,224,255,0.5);
}
.nav-link:hover {
    color: #fff;
}
.nav-link.active {
    color: #fff;
}
.nav-link.active::after {
    opacity: 1;
    transform: scaleX(1);
}
.nav-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 0 18px;
    background: var(--accent);
    color: var(--dark);
    border-radius: 10px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: 0 0 0 rgba(0,224,255,0);
    transition: box-shadow .3s ease, transform .2s ease, background .2s ease;
    white-space: nowrap;
}
.nav-cta:hover {
    background: var(--accent-light);
    color: var(--dark);
    box-shadow: 0 0 20px rgba(0,224,255,0.4);
    transform: translateY(-1px);
}
.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    background: transparent;
    border: none;
    cursor: pointer;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: 0;
    border-radius: 8px;
    transition: background .2s ease;
}
.nav-toggle:hover {
    background: rgba(255,255,255,0.08);
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: transform .3s ease, opacity .3s ease;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}
/* ===== Breadcrumb ===== */
.breadcrumb-wrap {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    margin-top: 72px;
}
.breadcrumb-inner {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
}
.breadcrumb-inner a {
    color: var(--primary);
    font-weight: 500;
}
.breadcrumb-inner .divider {
    color: var(--border);
    font-size: 13px;
}
.breadcrumb-inner .current {
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 320px;
}
@media (max-width: 520px) {
    .breadcrumb-inner .current {
        max-width: 200px;
    }
}
/* ===== Article Section ===== */
.article-section {
    padding: 48px 0 64px;
}
.article-container {
    max-width: 840px;
}
.article-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 40px 48px 48px;
    transition: box-shadow .3s ease;
}
.article-card:hover {
    box-shadow: var(--shadow-hover);
}
.article-header {
    margin-bottom: 36px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--border);
}
.article-category-badge {
    display: inline-flex;
    align-items: center;
    background: rgba(29,99,237,0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 6px;
    margin-bottom: 16px;
}
.article-header h1 {
    font-size: clamp(26px, 4vw, 36px);
    font-weight: 800;
    line-height: 1.35;
    margin-bottom: 16px;
    color: var(--text);
    letter-spacing: 0.3px;
}
.article-summary {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    font-size: 13px;
    color: var(--text-muted);
}
.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}
.read-count {
    color: var(--primary);
    font-weight: 600;
}
/* ===== Article Content Typography ===== */
.article-content {
    font-size: 16px;
    line-height: 1.75;
    color: var(--text);
    word-wrap: break-word;
}
.article-content h2 {
    font-size: 24px;
    font-weight: 700;
    line-height: 1.4;
    margin: 40px 0 14px;
    padding-left: 14px;
    border-left: 3px solid var(--primary);
    color: var(--text);
}
.article-content h3 {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.4;
    margin: 32px 0 12px;
    color: var(--text);
}
.article-content h4 {
    font-size: 18px;
    font-weight: 600;
    margin: 24px 0 10px;
    color: var(--text);
}
.article-content p {
    margin-bottom: 24px;
    line-height: 1.75;
}
.article-content ul,
.article-content ol {
    margin: 0 0 24px 22px;
    line-height: 1.75;
}
.article-content li {
    margin-bottom: 8px;
}
.article-content a {
    border-bottom: 1px solid rgba(29,99,237,0.3);
}
.article-content a:hover {
    border-bottom-color: var(--primary);
}
.article-content blockquote {
    margin: 24px 0;
    padding: 16px 22px;
    background: rgba(0,224,255,0.06);
    border-left: 3px solid var(--accent);
    border-radius: 0 12px 12px 0;
    color: var(--text-secondary);
    font-style: normal;
}
.article-content blockquote p:last-child {
    margin-bottom: 0;
}
.article-content pre {
    background: var(--dark);
    color: #d9e9ff;
    border-radius: 12px;
    padding: 20px 24px;
    overflow-x: auto;
    margin: 24px 0;
    font-size: 14px;
    line-height: 1.6;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}
.article-content code {
    background: #eef4fc;
    color: var(--primary-deeper);
    padding: 2px 6px;
    border-radius: 5px;
    font-size: 0.9em;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
}
.article-content pre code {
    background: transparent;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-size: inherit;
}
.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 24px 0;
    box-shadow: 0 6px 18px rgba(11,31,74,0.08);
}
.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: 10px 14px;
    text-align: left;
    line-height: 1.6;
}
.article-content th {
    background: #f0f6ff;
    font-weight: 600;
    color: var(--text);
}
.article-content tr:nth-child(even) td {
    background: #fafcff;
}
.article-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 32px 0;
}
/* ===== Article Footer ===== */
.article-footer {
    margin-top: 40px;
    padding-top: 28px;
    border-top: 1px solid var(--border);
}
.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 24px;
}
.tag {
    display: inline-flex;
    align-items: center;
    background: #f0f6ff;
    color: var(--primary-deeper);
    font-size: 13px;
    font-weight: 500;
    padding: 5px 14px;
    border-radius: 6px;
    transition: background .2s ease, color .2s ease;
}
.tag:hover {
    background: rgba(29,99,237,0.12);
    color: var(--primary);
}
.article-back {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: space-between;
    align-items: center;
}
/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 20px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background .25s ease, box-shadow .25s ease, transform .2s ease, border-color .25s ease;
    text-decoration: none;
    line-height: 1;
}
.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover {
    background: var(--primary-dark);
    color: #fff;
    box-shadow: 0 0 0 3px rgba(29,99,237,0.25);
    transform: translateY(-1px);
}
.btn-ghost {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--primary);
}
.btn-ghost:hover {
    background: rgba(29,99,237,0.06);
    color: var(--primary-dark);
    border-color: var(--primary-dark);
}
.btn-sm {
    height: 36px;
    padding: 0 14px;
    font-size: 13px;
}
.btn:focus-visible,
.nav-cta:focus-visible,
.nav-link:focus-visible,
.nav-toggle:focus-visible {
    outline: 3px solid rgba(29,99,237,0.4);
    outline-offset: 2px;
}
/* ===== Related Posts ===== */
.related-section {
    margin-top: 48px;
}
.section-title {
    font-size: 24px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.section-title::before {
    content: "";
    width: 4px;
    height: 22px;
    background: var(--primary);
    border-radius: 4px;
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.related-card {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    transition: transform .25s ease, box-shadow .25s ease;
    text-decoration: none;
    color: var(--text);
}
.related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    color: var(--text);
}
.related-card img {
    width: 100%;
    height: 130px;
    object-fit: cover;
    border-radius: 0;
}
.related-body {
    padding: 16px 18px 18px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.related-body .label {
    font-size: 12px;
    color: var(--primary);
    font-weight: 600;
    background: rgba(29,99,237,0.08);
    display: inline-flex;
    align-self: flex-start;
    padding: 3px 10px;
    border-radius: 6px;
}
.related-body h3 {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.related-body time {
    font-size: 12px;
    color: var(--text-muted);
}
/* ===== Reading End CTA ===== */
.reading-end {
    margin-top: 48px;
    background: var(--dark);
    border: 1px solid rgba(0,224,255,0.35);
    border-radius: var(--radius-lg);
    padding: 28px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    box-shadow: 0 0 30px rgba(0,224,255,0.1);
}
.reading-end p {
    color: rgba(255,255,255,0.85);
    font-size: 15px;
    line-height: 1.6;
}
.reading-end .btn {
    background: var(--accent);
    color: var(--dark);
    font-weight: 700;
}
.reading-end .btn:hover {
    background: var(--accent-light);
    box-shadow: 0 0 20px rgba(0,224,255,0.5);
}
/* ===== Not Found ===== */
.not-found {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 80px 40px;
    text-align: center;
}
.not-found-icon {
    font-size: 56px;
    margin-bottom: 16px;
    display: block;
}
.not-found h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}
.not-found p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 24px;
}
.not-found .btn {
    margin: 0 6px;
}
/* ===== Footer ===== */
.site-footer {
    background: var(--dark);
    color: rgba(255,255,255,0.75);
    padding: 60px 0 0;
    margin-top: 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 44px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 14px;
}
.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255,255,255,0.6);
    margin-bottom: 16px;
}
.footer-brand .badge {
    display: inline-flex;
    align-items: center;
    background: rgba(0,224,255,0.12);
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 6px;
    border: 1px solid rgba(0,224,255,0.25);
}
.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    margin-bottom: 18px;
    letter-spacing: 0.3px;
}
.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-col ul li a {
    color: rgba(255,255,255,0.65);
    font-size: 14px;
    transition: color .2s ease, padding-left .2s ease;
    padding-left: 0;
}
.footer-col ul li a:hover {
    color: var(--accent);
    padding-left: 4px;
}
.footer-contact-list li {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    line-height: 1.6;
    display: flex;
    align-items: center;
    gap: 6px;
}
.footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 14px;
    color: rgba(255,255,255,0.4);
}
/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .related-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .related-card:last-child {
        grid-column: span 2;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}
@media (max-width: 768px) {
    .site-header {
        height: 64px;
    }
    .nav-toggle {
        display: flex;
    }
    .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--dark);
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 12px 24px 20px;
        transform: translateY(-120%);
        transition: transform .35s ease;
        box-shadow: 0 20px 40px rgba(0,0,0,0.35);
        border-bottom: 2px solid var(--accent);
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }
    .nav-menu.open {
        transform: translateY(0);
    }
    .nav-menu .nav-link {
        display: block;
        padding: 14px 0;
        font-size: 16px;
        width: 100%;
        border-bottom: 1px solid rgba(255,255,255,0.06);
        white-space: normal;
    }
    .nav-menu .nav-link::after {
        display: none;
    }
    .nav-menu .nav-cta {
        margin-top: 16px;
        width: 100%;
        height: 46px;
        justify-content: center;
    }
    .breadcrumb-wrap {
        margin-top: 64px;
        padding: 12px 0;
    }
    .breadcrumb-inner {
        font-size: 13px;
    }
    .article-section {
        padding: 32px 0 48px;
    }
    .article-card {
        padding: 28px 22px 32px;
        border-radius: 14px;
    }
    .article-header h1 {
        font-size: 24px;
    }
    .article-summary {
        font-size: 15px;
        -webkit-line-clamp: 3;
    }
    .article-content {
        font-size: 15px;
    }
    .article-content h2 {
        font-size: 21px;
    }
    .article-content h3 {
        font-size: 18px;
    }
    .article-meta {
        gap: 12px;
        font-size: 12px;
    }
    .reading-end {
        padding: 22px 20px;
        flex-direction: column;
        align-items: flex-start;
    }
    .reading-end .btn {
        width: 100%;
    }
    .related-grid {
        grid-template-columns: 1fr;
    }
    .related-card:last-child {
        grid-column: span 1;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
        padding-bottom: 32px;
    }
    .footer-bottom {
        padding: 20px 0;
    }
}
@media (max-width: 520px) {
    .container {
        padding: 0 18px;
    }
    .nav-logo {
        font-size: 14px;
        gap: 6px;
    }
    .nav-logo-icon {
        width: 30px;
        height: 30px;
        font-size: 15px;
        border-radius: 8px;
    }
    .article-section {
        padding: 24px 0 40px;
    }
    .article-card {
        padding: 22px 16px 26px;
    }
    .article-content img {
        border-radius: 10px;
    }
    .article-content table {
        font-size: 13px;
    }
    .article-content th,
    .article-content td {
        padding: 8px 10px;
    }
    .section-title {
        font-size: 20px;
    }
    .related-body h3 {
        font-size: 15px;
    }
    .btn {
        height: 40px;
        font-size: 14px;
    }
}
/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* roulang page: category1 */
:root {
    --primary: #1D63ED;
    --primary-dark: #1550C7;
    --primary-deeper: #0D3587;
    --neon: #00E0FF;
    --neon-light: #33EAFF;
    --bg: #F5F9FF;
    --surface: #FFFFFF;
    --navy: #0A1428;
    --navy-panel: #101D38;
    --text: #101C33;
    --text-secondary: #55657E;
    --text-muted: #8296B0;
    --border: #DFE9F5;
    --success: #12B76A;
    --warning: #F79009;
    --error: #F04438;
    --radius: 14px;
    --radius-sm: 10px;
    --radius-xs: 8px;
    --shadow: 0 8px 24px rgba(11,31,74,0.06);
    --shadow-hover: 0 14px 34px rgba(11,31,74,0.10);
    --transition: all .25s ease;
  }
  *, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  html {
    scroll-behavior: smooth;
  }
  body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }
  img {
    max-width: 100%;
    display: block;
    border-radius: var(--radius);
  }
  a {
    color: var(--primary);
    text-decoration: none;
  }
  ul {
    list-style: none;
  }
  button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
  }
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
  }

  /* Header */
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    background: var(--navy);
    border-bottom: 2px solid rgba(0,224,255,0.7);
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
  }
  .nav-container {
    position: relative;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: 0.2px;
    white-space: nowrap;
  }
  .nav-logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    background: var(--neon);
    color: #0A1428;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 800;
    box-shadow: 0 0 14px rgba(0,224,255,0.35);
  }
  .nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
  }
  .nav-link {
    color: rgba(255,255,255,0.85);
    font-size: 15px;
    font-weight: 500;
    padding: 10px 4px;
    text-align: center;
    position: relative;
    transition: color .25s;
  }
  .nav-link:hover {
    color: #fff;
  }
  .nav-link.active {
    color: #fff;
  }
  .nav-link.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -2px;
    height: 2px;
    background: var(--neon);
    box-shadow: 0 0 12px rgba(0,224,255,0.5);
  }
  .nav-cta {
    background: var(--neon);
    color: #0A1428;
    font-weight: 700;
    font-size: 14px;
    height: 40px;
    padding: 0 22px;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    transition: box-shadow .25s, transform .25s;
  }
  .nav-cta:hover {
    box-shadow: 0 0 20px rgba(0,224,255,0.4);
    transform: translateY(-1px);
  }
  .nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    border-radius: 8px;
  }
  .nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all .3s;
  }
  .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);
  }

  /* Page Banner */
  .page-banner {
    position: relative;
    padding: 150px 0 72px;
    overflow: hidden;
    background: linear-gradient(135deg, #F5F9FF 0%, #E6EFFF 100%);
  }
  .banner-bg {
    position: absolute;
    inset: 0;
    background-image: url('/assets/images/backpic/back-1.png');
    background-size: cover;
    background-position: center;
    opacity: 0.5;
  }
  .banner-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(255,255,255,0.93) 0%, rgba(255,255,255,0.80) 55%, rgba(255,255,255,0.45) 100%);
  }
  .banner-content {
    position: relative;
    z-index: 2;
  }
  .breadcrumb {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 16px;
  }
  .breadcrumb a {
    color: var(--primary);
  }
  .breadcrumb span {
    color: var(--text-muted);
  }
  .banner-content h1 {
    font-size: clamp(32px, 4.5vw, 52px);
    font-weight: 800;
    color: var(--primary-deeper);
    line-height: 1.25;
    margin-bottom: 14px;
    letter-spacing: 1px;
  }
  .banner-content p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 560px;
  }

  /* Category Main Layout */
  .category-main {
    padding: 72px 0 96px;
  }
  .category-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 48px;
    align-items: start;
  }
  .category-content {
    min-width: 0;
  }
  .content-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 32px;
    transition: box-shadow .3s;
  }
  .content-section:hover {
    box-shadow: var(--shadow-hover);
  }
  .content-section h2 {
    font-size: 26px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid #EAF2FF;
    line-height: 1.4;
  }
  .content-section h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-deeper);
    margin: 28px 0 12px;
    line-height: 1.4;
  }
  .content-section p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 16px;
  }
  .content-section img {
    margin: 20px 0 8px;
    border-radius: var(--radius);
    width: 100%;
    object-fit: cover;
    max-height: 420px;
  }
  .content-section ul {
    margin: 0 0 16px;
  }
  .content-section ul li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 12px;
    color: var(--text-secondary);
    font-size: 15px;
  }
  .content-section ul li::before {
    content: '';
    position: absolute;
    left: 4px;
    top: 10px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--neon);
    box-shadow: 0 0 6px rgba(0,224,255,0.4);
  }
  .step-list {
    counter-reset: step;
    margin: 16px 0 4px;
  }
  .step-list li {
    counter-increment: step;
    padding-left: 48px;
    margin-bottom: 20px;
    position: relative;
  }
  .step-list li::before {
    content: '0' counter(step);
    position: absolute;
    left: 0;
    top: -2px;
    font-size: 30px;
    font-weight: 300;
    color: var(--neon);
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    background: transparent;
    box-shadow: none;
    width: auto;
    height: auto;
    border-radius: 0;
    letter-spacing: 0;
  }
  .step-list li::after {
    content: '';
    position: absolute;
    left: 18px;
    top: 28px;
    bottom: -12px;
    width: 1px;
    background: linear-gradient(180deg, rgba(0,224,255,0.5), rgba(0,224,255,0));
  }
  .step-list li:last-child::after {
    display: none;
  }

  /* Sidebar */
  .category-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }
  .side-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
  }
  .side-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid #EAF2FF;
  }
  .side-intro p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.7;
  }
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(0,224,255,0.1);
    border: 1px solid rgba(0,224,255,0.4);
    color: #0D6E8F;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 6px;
  }
  .side-links li {
    margin-bottom: 12px;
  }
  .side-links a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-size: 15px;
    font-weight: 500;
    transition: color .2s, transform .2s;
  }
  .side-links a:hover {
    color: var(--primary-dark);
    transform: translateX(3px);
  }
  .side-links a::before {
    content: '→';
    color: var(--neon);
    font-weight: 700;
  }
  .side-cta {
    background: linear-gradient(135deg, #0A1428 0%, #101D38 100%);
    border: 1px solid rgba(0,224,255,0.2);
  }
  .side-cta h3 {
    color: #fff;
    border-color: rgba(255,255,255,0.1);
  }
  .side-cta p {
    color: rgba(255,255,255,0.75);
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.7;
  }
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 44px;
    padding: 0 28px;
    font-size: 15px;
    font-weight: 700;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    transition: background .25s, box-shadow .25s, transform .25s;
  }
  .btn-primary {
    background: var(--primary);
    color: #fff;
  }
  .btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(29,99,237,0.3);
  }
  .btn-neon {
    background: var(--neon);
    color: #0A1428;
  }
  .btn-neon:hover {
    background: var(--neon-light);
    box-shadow: 0 0 24px rgba(0,224,255,0.5);
    transform: translateY(-2px);
  }
  .btn-lg {
    height: 56px;
    padding: 0 40px;
    font-size: 16px;
    border-radius: 12px;
  }
  .btn-block {
    width: 100%;
  }

  /* FAQ */
  .faq-section {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 96px 0;
  }
  .section-header {
    text-align: center;
    margin-bottom: 48px;
  }
  .section-header h2 {
    font-size: clamp(26px, 3.5vw, 40px);
    font-weight: 800;
    margin-bottom: 10px;
    line-height: 1.3;
  }
  .section-header p {
    color: var(--text-secondary);
    font-size: 16px;
  }
  .faq-list {
    max-width: 820px;
    margin: 0 auto;
  }
  .faq-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 16px;
    overflow: hidden;
    transition: box-shadow .3s, border-color .3s;
    border-left: 3px solid transparent;
  }
  .faq-item.open {
    box-shadow: var(--shadow);
    border-left-color: var(--neon);
  }
  .faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 20px 24px;
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    transition: color .25s;
    line-height: 1.5;
  }
  .faq-question:hover {
    color: var(--primary);
  }
  .faq-icon {
    font-size: 24px;
    color: var(--primary);
    font-weight: 400;
    transition: transform .3s;
    flex-shrink: 0;
    margin-left: 16px;
  }
  .faq-item.open .faq-icon {
    transform: rotate(45deg);
  }
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .4s ease;
  }
  .faq-item.open .faq-answer {
    max-height: 420px;
  }
  .faq-answer p {
    padding: 0 24px 22px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.75;
  }

  /* CTA */
  .cta-section {
    padding: 96px 0;
    background: var(--bg);
  }
  .cta-box {
    position: relative;
    background: linear-gradient(135deg, rgba(10,20,40,0.93), rgba(16,29,56,0.90)),
        url('/assets/images/backpic/back-2.webp') center/cover;
    border: 1px solid rgba(0,224,255,0.5);
    border-radius: 20px;
    padding: 64px 48px;
    text-align: center;
    box-shadow: 0 20px 50px rgba(11,31,74,0.28), 0 0 30px rgba(0,224,255,0.08);
    overflow: hidden;
  }
  .cta-box h2 {
    color: #fff;
    font-size: clamp(26px, 3vw, 38px);
    font-weight: 800;
    margin-bottom: 14px;
    line-height: 1.35;
  }
  .cta-box p {
    color: rgba(255,255,255,0.75);
    font-size: 16px;
    max-width: 560px;
    margin: 0 auto 32px;
  }

  /* Footer */
  .site-footer {
    background: var(--navy);
    color: rgba(255,255,255,0.7);
    padding-top: 72px;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 56px;
  }
  .footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
  }
  .footer-brand p {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 16px;
    max-width: 320px;
    line-height: 1.7;
  }
  .badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(0,224,255,0.12);
    border: 1px solid rgba(0,224,255,0.3);
    color: var(--neon);
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 6px;
  }
  .footer-col h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
  }
  .footer-col ul li {
    margin-bottom: 10px;
  }
  .footer-col a {
    color: rgba(255,255,255,0.65);
    font-size: 14px;
    transition: color .2s;
  }
  .footer-col a:hover {
    color: var(--neon);
  }
  .footer-contact-list li {
    font-size: 14px;
    color: rgba(255,255,255,0.65);
  }
  .footer-bottom {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.4);
    font-size: 13px;
  }

  /* Responsive */
  @media (max-width: 1024px) {
    .category-layout {
      grid-template-columns: 1fr;
      gap: 40px;
    }
    .category-sidebar {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
  }
  @media (max-width: 768px) {
    .nav-toggle {
      display: flex;
    }
    .nav-menu {
      display: none;
      position: absolute;
      top: 72px;
      left: 0;
      right: 0;
      background: var(--navy);
      flex-direction: column;
      align-items: stretch;
      gap: 4px;
      padding: 16px 24px 24px;
      border-bottom: 2px solid rgba(0,224,255,0.4);
      box-shadow: 0 16px 30px rgba(0,0,0,0.3);
    }
    .nav-menu.open {
      display: flex;
    }
    .nav-link {
      display: block;
      padding: 14px 4px;
      width: 100%;
      font-size: 16px;
    }
    .nav-cta {
      margin-top: 12px;
      width: 100%;
      height: 46px;
    }
    .page-banner {
      padding: 130px 0 56px;
    }
    .banner-content h1 {
      font-size: 32px;
    }
    .category-main {
      padding: 56px 0 72px;
    }
    .category-sidebar {
      grid-template-columns: 1fr;
    }
    .category-sidebar {
      display: flex;
      flex-direction: column;
    }
    .faq-section,
    .cta-section {
      padding: 72px 0;
    }
    .cta-box {
      padding: 48px 28px;
    }
    .footer-grid {
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
  }
  @media (max-width: 520px) {
    .nav-logo {
      font-size: 15px;
      gap: 8px;
    }
    .nav-logo-icon {
      width: 28px;
      height: 28px;
      font-size: 13px;
    }
    .nav-logo-text {
      max-width: 150px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .content-section {
      padding: 24px 20px;
    }
    .content-section h2 {
      font-size: 22px;
    }
    .content-section h3 {
      font-size: 18px;
    }
    .banner-content p {
      font-size: 16px;
    }
    .cta-box {
      padding: 40px 20px;
    }
    .cta-box .btn-lg {
      width: 100%;
      padding: 0 20px;
    }
    .footer-grid {
      grid-template-columns: 1fr;
      gap: 32px;
    }
  }

/* roulang page: category2 */
:root {
            --primary: #1D63ED;
            --primary-dark: #1550C7;
            --primary-deeper: #0D3587;
            --neon: #00E0FF;
            --neon-light: #33EAFF;
            --bg: #F5F9FF;
            --card: #FFFFFF;
            --dark-nav: #0A1428;
            --dark-panel: #101D38;
            --text-main: #101C33;
            --text-secondary: #55657E;
            --text-muted: #8296B0;
            --border: #DFE9F5;
            --success: #12B76A;
            --warning: #F79009;
            --error: #F04438;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-input: 8px;
            --radius-badge: 6px;
            --shadow-card: 0 8px 24px rgba(11, 31, 74, 0.06);
            --shadow-hover: 0 14px 34px rgba(11, 31, 74, 0.10);
            --shadow-panel: 0 20px 50px rgba(11, 31, 74, 0.18);
            --font-main: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

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

        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-card);
            display: block;
        }

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

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

        ul,
        ol {
            padding-left: 1.4em;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ============ 导航 ============ */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--dark-nav);
            border-bottom: 2px solid var(--neon);
            box-shadow: 0 4px 30px rgba(0, 224, 255, 0.08);
            height: 72px;
        }

        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-weight: 700;
            font-size: 17px;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }

        .site-logo:hover {
            color: var(--neon);
        }

        .nav-logo-icon {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: linear-gradient(135deg, var(--neon), var(--primary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 800;
            color: #0a1428;
            flex-shrink: 0;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            padding: 0;
        }

        .nav-menu a {
            color: rgba(255, 255, 255, 0.85);
            font-size: 15px;
            line-height: 44px;
            padding: 0 16px;
            border-radius: 8px;
            transition: all 0.25s ease;
            position: relative;
            display: inline-block;
        }

        .nav-menu a:hover {
            color: #ffffff;
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-menu a.active {
            color: #ffffff;
        }

        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 16px;
            right: 16px;
            height: 2px;
            background: var(--neon);
            box-shadow: 0 0 12px rgba(0, 224, 255, 0.5);
            border-radius: 2px;
        }

        .nav-cta {
            background: var(--neon);
            color: #0a1428 !important;
            font-weight: 700;
            border-radius: var(--radius-btn);
            padding: 0 22px !important;
            margin-left: 12px;
            line-height: 40px !important;
            transition: all 0.25s ease;
            box-shadow: 0 0 0 rgba(0, 224, 255, 0);
        }

        .nav-cta:hover {
            background: var(--neon-light);
            color: #0a1428 !important;
            box-shadow: 0 0 20px rgba(0, 224, 255, 0.4);
            transform: translateY(-1px);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            width: 44px;
            height: 44px;
            cursor: pointer;
            position: relative;
            z-index: 1100;
            border-radius: 8px;
        }

        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: #fff;
            margin: 5px auto;
            transition: all 0.3s ease;
            border-radius: 2px;
        }

        .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);
        }

        /* ============ 内页横幅 ============ */
        .page-banner {
            position: relative;
            padding: 160px 0 80px;
            background: linear-gradient(135deg, rgba(10, 20, 40, 0.88), rgba(13, 53, 135, 0.72)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            background-color: var(--dark-nav);
            border-bottom: 1px solid var(--border);
            overflow: hidden;
        }

        .page-banner::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 80px;
            background: linear-gradient(to top, var(--bg), transparent);
            pointer-events: none;
        }

        .page-banner-inner {
            position: relative;
            z-index: 2;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .page-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }

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

        .page-banner .breadcrumb a:hover {
            color: var(--neon);
        }

        .page-banner .breadcrumb span {
            color: rgba(255, 255, 255, 0.4);
        }

        .page-banner h1 {
            font-size: clamp(32px, 4.5vw, 48px);
            font-weight: 800;
            color: #ffffff;
            line-height: 1.3;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
        }

        .page-banner p.subtitle {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            line-height: 1.6;
        }

        .page-banner .banner-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 28px;
        }

        .page-banner .banner-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 13px;
            backdrop-filter: blur(4px);
        }

        /* ============ 主内容两栏 ============ */
        .main-wrap {
            padding: 72px 0 96px;
        }

        .main-layout {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .main-content {
            min-width: 0;
        }

        .content-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 36px;
            margin-bottom: 32px;
            box-shadow: var(--shadow-card);
        }

        .content-card h2 {
            font-size: clamp(24px, 2.6vw, 32px);
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 20px;
            line-height: 1.3;
            letter-spacing: 0.3px;
            position: relative;
            padding-left: 16px;
        }

        .content-card h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 6px;
            bottom: 6px;
            width: 4px;
            background: var(--neon);
            border-radius: 4px;
        }

        .content-card h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-main);
            margin: 32px 0 14px;
            line-height: 1.4;
        }

        .content-card p {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.75;
            margin-bottom: 18px;
        }

        .content-card ul,
        .content-card ol {
            color: var(--text-secondary);
            font-size: 16px;
            line-height: 1.75;
            margin-bottom: 20px;
            padding-left: 1.5em;
        }

        .content-card li {
            margin-bottom: 8px;
        }

        .content-card li::marker {
            color: var(--primary);
        }

        .content-card img {
            margin: 24px 0;
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
        }

        .content-card .img-caption {
            font-size: 13px;
            color: var(--text-muted);
            text-align: center;
            margin-top: -12px;
            margin-bottom: 20px;
        }

        .safe-list {
            list-style: none;
            padding: 0;
            margin: 24px 0;
        }

        .safe-list li {
            display: flex;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border);
        }

        .safe-list li:last-child {
            border-bottom: none;
        }

        .safe-list .icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(29, 99, 237, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            flex-shrink: 0;
        }

        .safe-list .item-content {
            flex: 1;
        }

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

        .safe-list .item-desc {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .level-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin: 24px 0;
        }

        .level-item {
            text-align: center;
            padding: 20px 16px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
        }

        .level-num {
            font-size: 32px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }

        .level-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 6px;
            font-weight: 500;
        }

        .metric-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 28px 0;
        }

        .metric-box {
            text-align: center;
            background: linear-gradient(160deg, #ffffff, #F0F7FF);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 28px 16px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .metric-box:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .metric-value {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
        }

        .metric-box .metric-unit {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary-dark);
        }

        .metric-label {
            font-size: 14px;
            color: var(--text-secondary);
            margin-top: 8px;
        }

        .quote-block {
            background: var(--bg);
            border-left: 4px solid var(--neon);
            padding: 20px 24px;
            border-radius: 0 10px 10px 0;
            margin: 24px 0;
        }

        .quote-block p {
            margin-bottom: 0;
            font-style: normal;
            color: var(--text-secondary);
            font-size: 15px;
        }

        /* ============ 侧栏 ============ */
        .sidebar {
            min-width: 0;
        }

        .sidebar-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 28px;
            margin-bottom: 24px;
            box-shadow: var(--shadow-card);
        }

        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--bg);
            position: relative;
        }

        .sidebar-card h3::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 40px;
            height: 2px;
            background: var(--neon);
            border-radius: 2px;
        }

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

        .sidebar-links {
            list-style: none;
            padding: 0;
        }

        .sidebar-links li {
            border-bottom: 1px solid var(--bg);
        }

        .sidebar-links li:last-child {
            border-bottom: none;
        }

        .sidebar-links a {
            display: block;
            padding: 12px 0;
            font-size: 14px;
            color: var(--text-main);
            font-weight: 500;
            transition: all 0.2s ease;
            position: relative;
        }

        .sidebar-links a:hover {
            color: var(--primary);
            padding-left: 6px;
        }

        .sidebar-cta {
            background: linear-gradient(135deg, var(--dark-nav), var(--dark-panel));
            border: 1px solid rgba(0, 224, 255, 0.3);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .sidebar-cta .icon-large {
            font-size: 40px;
            margin-bottom: 12px;
            display: block;
        }

        .sidebar-cta h3 {
            color: #fff;
            border-bottom: none;
            padding-bottom: 0;
        }

        .sidebar-cta h3::after {
            display: none;
        }

        .sidebar-cta p {
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }

        .sidebar-cta .btn-cta-mini {
            display: inline-block;
            background: var(--neon);
            color: #0a1428;
            font-weight: 700;
            font-size: 15px;
            padding: 0 28px;
            line-height: 44px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .sidebar-cta .btn-cta-mini:hover {
            background: var(--neon-light);
            box-shadow: 0 0 20px rgba(0, 224, 255, 0.4);
            transform: translateY(-2px);
            color: #0a1428;
        }

        .sidebar-badge-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
        }

        .sidebar-badge-list .badge {
            background: var(--bg);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            font-size: 12px;
            padding: 4px 10px;
            border-radius: var(--radius-badge);
        }

        /* ============ 按钮 ============ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 15px;
            font-weight: 600;
            height: 44px;
            padding: 0 24px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            background: var(--primary);
            color: #fff;
        }

        .btn:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(29, 99, 237, 0.25);
        }

        .btn:focus-visible {
            outline: 3px solid rgba(29, 99, 237, 0.25);
            outline-offset: 2px;
        }

        .btn-lg {
            height: 56px;
            padding: 0 36px;
            font-size: 16px;
        }

        .btn-outline {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.5);
            color: #fff;
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
        }

        /* ============ CTA横幅 ============ */
        .cta-section {
            position: relative;
            padding: 80px 0;
            background: linear-gradient(135deg, rgba(10, 20, 40, 0.92), rgba(13, 53, 135, 0.82)), url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            border-top: 2px solid rgba(0, 224, 255, 0.4);
            border-bottom: 2px solid rgba(0, 224, 255, 0.2);
        }

        .cta-inner {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
            padding: 0 24px;
        }

        .cta-inner h2 {
            font-size: clamp(26px, 3.5vw, 38px);
            color: #fff;
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .cta-inner p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 16px;
            margin-bottom: 30px;
            line-height: 1.7;
        }

        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn-neon {
            background: var(--neon);
            color: #0a1428;
            font-weight: 700;
        }

        .btn-neon:hover {
            background: var(--neon-light);
            box-shadow: 0 0 24px rgba(0, 224, 255, 0.5);
            transform: translateY(-2px);
            color: #0a1428;
        }

        /* ============ FAQ ============ */
        .faq-section {
            padding: 96px 0;
            background: var(--card);
        }

        .faq-section .container {
            max-width: 860px;
        }

        .section-title {
            text-align: center;
            font-size: clamp(26px, 3.5vw, 38px);
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .section-subtitle {
            text-align: center;
            color: var(--text-secondary);
            font-size: 16px;
            margin-bottom: 48px;
            line-height: 1.7;
        }

        .faq-list {
            list-style: none;
            padding: 0;
        }

        .faq-item {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            margin-bottom: 14px;
            overflow: hidden;
            transition: box-shadow 0.3s ease;
        }

        .faq-item:hover {
            box-shadow: var(--shadow-card);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 22px 28px;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            font-family: var(--font-main);
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            line-height: 1.5;
        }

        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            border: 2px solid var(--primary);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 16px;
            transition: transform 0.3s ease, background 0.3s ease, color 0.3s ease;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }

        .faq-answer-inner {
            padding: 0 28px 22px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            border-top: 1px solid transparent;
        }

        .faq-item.active {
            border-left: 3px solid var(--neon);
            box-shadow: 0 8px 24px rgba(11, 31, 74, 0.08);
        }

        .faq-item.active .faq-answer-inner {
            border-top-color: var(--bg);
            padding-top: 16px;
        }

        /* ============ 页脚 ============ */
        .site-footer {
            background: var(--dark-nav);
            padding: 64px 0 0;
            border-top: 2px solid rgba(0, 224, 255, 0.3);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 48px;
        }

        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .badge {
            display: inline-block;
            background: rgba(0, 224, 255, 0.12);
            border: 1px solid rgba(0, 224, 255, 0.4);
            color: var(--neon);
            font-size: 12px;
            padding: 4px 12px;
            border-radius: var(--radius-badge);
            font-weight: 500;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 700;
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

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

        .footer-col ul a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            transition: color 0.2s ease;
            line-height: 1.8;
        }

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

        .footer-contact-list li {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            line-height: 1.8;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
            color: rgba(255, 255, 255, 0.35);
            font-size: 13px;
        }

        /* ============ 响应式 ============ */
        @media (max-width: 1024px) {
            .main-layout {
                grid-template-columns: 1fr;
            }

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

            .level-grid,
            .metric-row {
                grid-template-columns: repeat(3, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }

            .nav-menu {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: var(--dark-nav);
                flex-direction: column;
                align-items: stretch;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 2px solid var(--neon);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
                transform: translateY(-120%);
                transition: transform 0.35s ease;
                max-height: calc(100vh - 72px);
                overflow-y: auto;
            }

            .nav-menu.open {
                transform: translateY(0);
            }

            .nav-menu a {
                display: block;
                padding: 0;
                line-height: 48px;
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
                font-size: 16px;
                border-radius: 0;
            }

            .nav-menu a.active::after {
                left: 0;
                right: auto;
                width: 40px;
            }

            .nav-cta {
                margin: 12px 0 0;
                text-align: center;
                background: var(--neon);
                color: #0a1428 !important;
                border-radius: var(--radius-btn);
                line-height: 44px !important;
                border-bottom: none !important;
            }

            .page-banner {
                padding: 140px 0 64px;
            }

            .page-banner h1 {
                font-size: 30px;
            }

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

            .main-wrap {
                padding: 48px 0 64px;
            }

            .content-card {
                padding: 24px 20px;
            }

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

            .metric-row {
                grid-template-columns: 1fr;
                gap: 12px;
            }

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

            .cta-section {
                padding: 60px 0;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .cta-buttons .btn {
                width: 100%;
                max-width: 280px;
            }

            .faq-section {
                padding: 64px 0;
            }
        }

        @media (max-width: 520px) {
            .container,
            .header-inner,
            .main-layout,
            .page-banner-inner {
                padding-left: 16px;
                padding-right: 16px;
            }

            .site-logo {
                font-size: 15px;
            }

            .page-banner {
                padding: 130px 0 56px;
            }

            .page-banner h1 {
                font-size: 26px;
            }

            .content-card {
                padding: 20px 16px;
            }

            .content-card h2 {
                font-size: 22px;
            }

            .sidebar-card {
                padding: 20px 16px;
            }

            .footer-grid {
                gap: 24px;
            }

            .footer-bottom {
                font-size: 12px;
            }

            .nav-login-btn {
                font-size: 13px;
                padding: 0 14px;
            }
        }