:root {
    --primary: #1a3b5c;
    --primary-light: #2c5a7a;
    --primary-lighter: #3d7a9e;
    --accent: #7dd3fc;
    --accent-glow: rgba(125, 211, 252, 0.4);
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #fefefe;
    --bg-nav: rgba(255, 255, 255, 0.82);
    --bg-search: #f1f5f9;
    --bg-faq: #ffffff;
    --bg-footer: #ffffff;
    --bg-step: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --border-light: #eef2f6;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.08);
    --shadow-glow: 0 8px 32px rgba(26, 59, 92, 0.18);
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 24px;
    --radius-xl: 28px;
    --radius-pill: 60px;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.45s cubic-bezier(0.22, 1, 0.36, 1);
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(255, 255, 255, 0.35);
    --glass-blur: 16px;
    --font-stack: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.dark-mode {
    --primary: #7dd3fc;
    --primary-light: #b9d9f0;
    --primary-lighter: #38bdf8;
    --accent: #7dd3fc;
    --accent-glow: rgba(125, 211, 252, 0.25);
    --bg-body: #0b1120;
    --bg-card: #1e293b;
    --bg-card-hover: #243147;
    --bg-nav: rgba(15, 23, 42, 0.82);
    --bg-search: #1e293b;
    --bg-faq: #1e293b;
    --bg-footer: #0f172a;
    --bg-step: #1e293b;
    --text-primary: #e2e8f0;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    --border: #1e293b;
    --border-light: #334155;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 8px 32px rgba(125, 211, 252, 0.12);
    --glass-bg: rgba(30, 41, 59, 0.72);
    --glass-border: rgba(255, 255, 255, 0.08);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-stack);
}

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

body {
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-base), color var(--transition-base);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
    text-decoration: underline;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航吸顶 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-nav);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    box-shadow: 0 1px 0 var(--border-light), 0 4px 20px rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.dark-mode .navbar {
    border-bottom-color: var(--border-light);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04), 0 4px 20px rgba(0, 0, 0, 0.25);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.logo:hover {
    text-decoration: none;
    transform: scale(1.02);
}

.logo svg {
    width: 40px;
    height: 40px;
    transition: transform var(--transition-base);
}

.logo:hover svg {
    transform: rotate(-6deg) scale(1.05);
}

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

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast), transform var(--transition-fast);
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--primary);
    text-decoration: none;
    transform: translateY(-1px);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-search);
    border-radius: var(--radius-pill);
    padding: 6px 8px 6px 18px;
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
    border: 1px solid transparent;
}

.search-box:focus-within {
    background: var(--bg-card);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 8px 0;
    font-size: 0.9rem;
    color: var(--text-primary);
    outline: none;
    width: 150px;
    transition: width var(--transition-base);
}

.search-box input:focus {
    width: 190px;
}

.search-box input::placeholder {
    color: var(--text-light);
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    display: flex;
    align-items: center;
    color: var(--text-muted);
    border-radius: 50%;
    transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
    color: var(--primary);
    background: var(--accent-glow);
    transform: scale(1.08);
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.4rem;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-base), background var(--transition-fast);
    line-height: 1;
}

.theme-toggle:hover {
    transform: rotate(20deg) scale(1.1);
    background: var(--accent-glow);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color var(--transition-fast), transform var(--transition-fast);
    padding: 4px;
    line-height: 1;
}

.mobile-menu-btn:hover {
    color: var(--primary);
    transform: scale(1.1);
}

/* ===== 移动菜单 ===== */
.mobile-menu {
    display: none;
    flex-direction: column;
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-top: 1px solid var(--border-light);
    padding: 8px 24px 16px;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-menu a {
    padding: 13px 0;
    border-bottom: 1px solid var(--border-light);
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

.mobile-menu a:hover {
    color: var(--primary);
    padding-left: 8px;
    text-decoration: none;
}

.mobile-menu.active {
    display: flex;
}

/* ===== 面包屑 ===== */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.85rem;
    color: var(--text-muted);
    animation: fadeInUp 0.5s ease both;
}

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

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

.breadcrumb span {
    margin: 0 6px;
}

/* ===== Banner轮播 ===== */
.banner {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin: 8px 0 40px;
    background: linear-gradient(135deg, #1a3b5c 0%, #2c5a7a 50%, #3d7a9e 100%);
    color: #ffffff;
    min-height: 320px;
    box-shadow: var(--shadow-glow);
    animation: fadeInUp 0.6s ease both;
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(125, 211, 252, 0.25) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 8s ease-in-out infinite;
}

.banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -20px) scale(1.05); }
}

.banner-slide {
    display: none;
    padding: 48px 56px;
    min-height: 320px;
    flex-direction: column;
    justify-content: center;
    position: relative;
    z-index: 1;
}

.banner-slide.active {
    display: flex;
    animation: bannerFadeIn 0.6s ease both;
}

@keyframes bannerFadeIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.banner h2 {
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
    color: #ffffff;
    letter-spacing: -0.01em;
}

.banner p {
    font-size: 1.1rem;
    opacity: 0.92;
    max-width: 620px;
    margin-bottom: 28px;
    color: #f0f9ff;
    line-height: 1.7;
}

.banner-btn {
    display: inline-block;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: #1a3b5c;
    padding: 14px 32px;
    border-radius: var(--radius-pill);
    font-weight: 600;
    align-self: flex-start;
    transition: transform var(--transition-base), box-shadow var(--transition-base), background var(--transition-fast);
    text-decoration: none;
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.banner-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.25);
    text-decoration: none;
    background: #ffffff;
}

.banner-btn:active {
    transform: translateY(-1px) scale(0.99);
}

.banner-dots {
    position: absolute;
    bottom: 22px;
    left: 56px;
    display: flex;
    gap: 10px;
    z-index: 2;
}

.banner-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: background var(--transition-base), width var(--transition-base), transform var(--transition-fast);
}

.banner-dots span:hover {
    background: rgba(255, 255, 255, 0.7);
    transform: scale(1.2);
}

.banner-dots span.active {
    background: #ffffff;
    width: 26px;
    border-radius: 20px;
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

/* ===== 数字动画区 ===== */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 24px;
    margin: 40px 0;
    text-align: center;
}

.stat-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 28px 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: opacity var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.stat-item:hover::before {
    opacity: 1;
}

.stat-number {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
    transition: color var(--transition-base);
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== 通用卡片 ===== */
.section-title {
    font-size: 1.9rem;
    font-weight: 700;
    margin: 48px 0 24px;
    color: var(--text-primary);
    border-left: 6px solid var(--primary);
    padding-left: 20px;
    line-height: 1.3;
    position: relative;
    animation: fadeInUp 0.5s ease both;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 40px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
    border-radius: 3px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-base), background var(--transition-base);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.5s ease both;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--accent-glow) 0%, transparent 60%);
    opacity: 0;
    transition: opacity var(--transition-slow);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.card:hover::before {
    opacity: 1;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--primary);
    position: relative;
    z-index: 1;
    transition: color var(--transition-base);
}

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
    line-height: 1.7;
}

.card-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    margin-top: 16px;
    position: relative;
    z-index: 1;
}

/* ===== FAQ 手风琴 ===== */
.faq-item {
    background: var(--bg-faq);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--border-light);
    overflow: hidden;
    transition: box-shadow var(--transition-base), border-color var(--transition-base), transform var(--transition-fast);
    animation: fadeInUp 0.4s ease both;
}

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

.faq-item.active {
    border-color: var(--primary);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.05rem;
    transition: background var(--transition-fast), color var(--transition-fast);
    color: var(--text-primary);
    user-select: none;
    position: relative;
}

.faq-question:hover {
    background: var(--bg-search);
}

.faq-question::after {
    content: '+';
    font-size: 1.6rem;
    font-weight: 300;
    color: var(--text-muted);
    transition: transform var(--transition-base), color var(--transition-fast);
    flex-shrink: 0;
    margin-left: 16px;
    line-height: 1;
}

.faq-item.active .faq-question::after {
    content: '−';
    color: var(--primary);
    transform: rotate(180deg);
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow), padding var(--transition-slow);
    padding: 0 24px;
    background: var(--bg-faq);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 24px 24px;
}

.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    border-top: 1px solid var(--border-light);
    padding-top: 16px;
}

/* ===== HowTo 步骤 ===== */
.howto-steps {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin: 28px 0;
}

.step {
    display: flex;
    gap: 20px;
    background: var(--bg-step);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    animation: fadeInUp 0.5s ease both;
}

.step:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary);
}

.step-num {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.3rem;
    flex-shrink: 0;
    box-shadow: 0 4px 12px var(--accent-glow);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.step:hover .step-num {
    transform: scale(1.1) rotate(-6deg);
    box-shadow: 0 6px 20px var(--accent-glow);
}

.step h3 {
    font-size: 1.1rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.step p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 文章列表 ===== */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.article-item {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 24px;
    border: 1px solid var(--border-light);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    animation: fadeInUp 0.5s ease both;
    position: relative;
    overflow: hidden;
}

.article-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.article-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.article-item:hover::after {
    transform: scaleX(1);
}

.article-item h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--primary);
    line-height: 1.4;
    transition: color var(--transition-fast);
}

.article-item time {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 10px;
}

.article-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-item a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--primary);
    transition: color var(--transition-fast), letter-spacing var(--transition-fast);
}

.article-item a:hover {
    color: var(--accent);
    letter-spacing: 0.5px;
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #ffffff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px var(--accent-glow);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
    z-index: 999;
    font-size: 1.6rem;
    line-height: 1;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 14px 32px var(--accent-glow);
}

.back-to-top:active {
    transform: translateY(-2px) scale(0.98);
}

/* ===== 页脚 ===== */
footer {
    background: var(--bg-footer);
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
    margin-top: 64px;
    transition: background var(--transition-base), border-color var(--transition-base);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 18px;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 28px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
}

.footer-col a,
.footer-col p {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-col a:hover {
    color: var(--primary);
    padding-left: 4px;
    text-decoration: none;
}

.copyright {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ===== 滚动动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-item,
.card,
.article-item,
.step,
.faq-item {
    animation-fill-mode: both;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .nav-links {
        gap: 20px;
    }
    .nav-links a {
        font-size: 0.88rem;
    }
    .banner h2 {
        font-size: 2rem;
    }
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }
    .mobile-menu-btn {
        display: block;
    }
    .nav-actions .search-box {
        display: none;
    }
    .banner h2 {
        font-size: 1.8rem;
    }
    .banner p {
        font-size: 1rem;
    }
    .banner-slide {
        padding: 32px 24px;
    }
    .banner-dots {
        left: 24px;
        bottom: 18px;
    }
    .section-title {
        font-size: 1.6rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 16px;
    }
    .nav-inner {
        height: 64px;
    }
    .logo {
        font-size: 1.25rem;
    }
    .logo svg {
        width: 34px;
        height: 34px;
    }
    .section-title {
        font-size: 1.4rem;
        padding-left: 14px;
        border-left-width: 4px;
        margin: 36px 0 18px;
    }
    .stat-number {
        font-size: 2rem;
    }
    .stat-item {
        padding: 20px 8px;
    }
    .banner {
        border-radius: var(--radius-md);
        min-height: 260px;
    }
    .banner-slide {
        padding: 28px 20px;
        min-height: 260px;
    }
    .banner h2 {
        font-size: 1.5rem;
    }
    .banner p {
        font-size: 0.92rem;
        margin-bottom: 20px;
    }
    .banner-btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
    .card {
        padding: 22px;
        border-radius: var(--radius-md);
    }
    .card h3 {
        font-size: 1.15rem;
    }
    .card-grid {
        gap: 18px;
    }
    .article-list {
        grid-template-columns: 1fr;
        gap: 18px;
    }
    .step {
        padding: 18px;
        gap: 14px;
    }
    .step-num {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
    }
    .step h3 {
        font-size: 1rem;
    }
    .faq-question {
        padding: 16px 18px;
        font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
        padding: 0 18px 18px;
    }
    .faq-answer p {
        font-size: 0.9rem;
    }
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 46px;
        height: 46px;
        font-size: 1.4rem;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
    .copyright {
        flex-direction: column;
        text-align: center;
        gap: 6px;
    }
}

@media (max-width: 380px) {
    .banner h2 {
        font-size: 1.3rem;
    }
    .banner p {
        font-size: 0.85rem;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 无障碍与偏好 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

::selection {
    background: var(--accent-glow);
    color: var(--text-primary);
}

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--text-light);
    border-radius: 5px;
    border: 2px solid var(--bg-search);
}

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