:root {
    --primary: #0f172a;
    --accent: #f59e0b;
    --accent-dark: #b45309;
    --accent-light: #fbbf24;
    --bg: #ffffff;
    --bg-alt: #f8fafc;
    --text: #1e293b;
    --text-light: #475569;
    --border: #e2e8f0;
    --card-bg: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(255, 255, 255, 0.45);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 40px -12px rgba(15, 23, 42, 0.18);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

[data-theme="dark"] {
    --primary: #f1f5f9;
    --bg: #0b1120;
    --bg-alt: #111c33;
    --text: #e2e8f0;
    --text-light: #94a3b8;
    --border: #1e293b;
    --card-bg: #111c33;
    --glass-bg: rgba(17, 28, 51, 0.72);
    --glass-border: rgba(148, 163, 184, 0.18);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 40px -12px rgba(0, 0, 0, 0.6);
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    transition: background var(--transition), color var(--transition);
    padding-top: 70px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
}

::selection {
    background: var(--accent);
    color: #fff;
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============ 吸顶导航（毛玻璃） ============ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    transition: background var(--transition), border var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
    color: var(--primary);
    text-decoration: none;
    transition: transform var(--transition);
}

.logo:hover {
    transform: scale(1.03);
}

.logo svg {
    width: 36px;
    height: 36px;
    filter: drop-shadow(0 4px 8px rgba(245, 158, 11, 0.35));
    transition: transform var(--transition);
}

.logo:hover svg {
    transform: rotate(-8deg);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 26px;
    list-style: none;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
    transition: color var(--transition);
}

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

.nav-links a:hover {
    color: var(--accent);
}

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

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

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box input {
    padding: 9px 14px 9px 38px;
    border: 1px solid var(--border);
    border-radius: 22px;
    background: var(--bg-alt);
    color: var(--text);
    font-size: 0.9rem;
    width: 180px;
    transition: width var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

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

.search-box input:focus {
    outline: none;
    border-color: var(--accent);
    width: 230px;
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.15);
}

.search-box svg {
    position: absolute;
    left: 12px;
    width: 18px;
    height: 18px;
    fill: var(--text-light);
    pointer-events: none;
    transition: fill var(--transition);
}

.search-box input:focus + svg,
.search-box:focus-within svg {
    fill: var(--accent);
}

.theme-toggle,
.menu-toggle {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text);
    transition: background var(--transition), border-color var(--transition), transform var(--transition), color var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
    transform: translateY(-2px);
}

.theme-toggle:active,
.menu-toggle:active {
    transform: scale(0.94);
}

.menu-toggle {
    display: none;
}

/* ============ 移动菜单 ============ */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px 24px;
    z-index: 999;
    flex-direction: column;
    gap: 4px;
    box-shadow: var(--shadow-lg);
    animation: menuDrop 0.3s ease;
}

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

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

.mobile-menu a {
    color: var(--text);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    padding: 12px 8px;
    border-bottom: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition), padding-left var(--transition);
}

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

.mobile-menu a:hover {
    background: var(--bg-alt);
    color: var(--accent);
    padding-left: 16px;
}

/* ============ Banner 轮播 ============ */
.banner {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    margin: 24px 0;
    background: var(--bg-alt);
    height: 380px;
    box-shadow: var(--shadow-lg);
}

.banner-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
}

.banner-slide.active {
    opacity: 1;
    visibility: visible;
}

.banner-slide svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 0;
    opacity: 0.16;
    transition: transform 6s ease;
}

.banner-slide.active svg {
    transform: scale(1.08);
}

.banner-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
    animation: bannerUp 0.8s ease both;
}

@keyframes bannerUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.banner-content h2 {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--primary);
    margin-bottom: 14px;
    line-height: 1.25;
}

.banner-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 24px;
}

.banner-indicators {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 2;
}

.banner-indicators span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border);
    cursor: pointer;
    transition: background var(--transition), width var(--transition), border-radius var(--transition);
}

.banner-indicators span:hover {
    background: var(--accent-light);
}

.banner-indicators span.active {
    background: var(--accent);
    width: 28px;
    border-radius: 6px;
}

/* ============ 首屏关键词区 ============ */
.hero-keyword {
    position: relative;
    text-align: center;
    padding: 56px 24px;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08) 0%, rgba(14, 165, 233, 0.06) 50%, var(--bg) 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 40px;
    overflow: hidden;
}

.hero-keyword::before {
    content: '';
    position: absolute;
    top: -60%;
    left: -10%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.hero-keyword::after {
    content: '';
    position: absolute;
    bottom: -60%;
    right: -10%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-keyword h1 {
    position: relative;
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--primary);
    margin-bottom: 18px;
    line-height: 1.3;
}

.hero-keyword .highlight {
    color: var(--accent);
    position: relative;
    white-space: nowrap;
}

.hero-keyword .highlight::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 2px;
    width: 100%;
    height: 8px;
    background: rgba(245, 158, 11, 0.22);
    border-radius: 4px;
    z-index: -1;
}

.hero-keyword p {
    position: relative;
    font-size: 1.12rem;
    color: var(--text-light);
    max-width: 820px;
    margin: 0 auto 28px;
}

.cta-btn {
    position: relative;
    display: inline-block;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    padding: 14px 38px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.02em;
    box-shadow: 0 8px 20px -6px rgba(245, 158, 11, 0.55);
    transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.cta-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 14px 28px -8px rgba(245, 158, 11, 0.65);
    filter: brightness(1.05);
}

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

/* ============ 区块通用 ============ */
section {
    margin-bottom: 64px;
}

.section-title {
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--primary);
    margin-bottom: 12px;
    position: relative;
    padding-bottom: 14px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 64px;
    height: 4px;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
}

.section-sub {
    color: var(--text-light);
    margin-bottom: 32px;
    font-size: 1rem;
}

/* ============ 卡片网格 ============ */
.grid {
    display: grid;
    gap: 24px;
}

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

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

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.card {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light), transparent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(245, 158, 11, 0.35);
}

.card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    transition: transform var(--transition);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(-4deg);
}

.card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--primary);
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.card ul li {
    transition: transform var(--transition);
}

.card ul li:hover {
    transform: translateX(4px);
}

.card ul li a:hover {
    color: var(--accent) !important;
}

/* ============ 文章列表 ============ */
.article-item {
    display: flex;
    gap: 22px;
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 18px;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.article-item:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(245, 158, 11, 0.35);
}

.article-thumb {
    flex-shrink: 0;
    width: 140px;
    height: 90px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--bg-alt);
    transition: transform var(--transition);
}

.article-item:hover .article-thumb {
    transform: scale(1.04);
}

.article-thumb svg {
    width: 100%;
    height: 100%;
    transition: transform var(--transition);
}

.article-item:hover .article-thumb svg {
    transform: scale(1.1);
}

.article-info {
    flex: 1;
    min-width: 0;
}

.article-info h4 {
    font-size: 1.12rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
    transition: color var(--transition);
}

.article-item:hover .article-info h4 {
    color: var(--accent);
}

.article-meta {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 8px;
}

.article-info p {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 10px;
}

.read-more {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition), color var(--transition);
}

.read-more:hover {
    gap: 10px;
    color: var(--accent-dark);
    text-decoration: none;
}

/* ============ FAQ ============ */
.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    overflow: hidden;
    background: var(--card-bg);
    box-shadow: var(--shadow);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.faq-item:hover {
    border-color: rgba(245, 158, 11, 0.35);
}

.faq-item.open {
    border-color: var(--accent);
    box-shadow: 0 8px 24px -8px rgba(245, 158, 11, 0.3);
}

.faq-question {
    padding: 18px 22px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-weight: 600;
    font-size: 1rem;
    color: var(--primary);
    transition: background var(--transition), color var(--transition);
    user-select: none;
}

.faq-question:hover {
    background: var(--bg-alt);
    color: var(--accent);
}

.faq-question svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    fill: var(--text-light);
    transition: transform var(--transition), fill var(--transition);
}

.faq-item.open .faq-question svg {
    transform: rotate(180deg);
    fill: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), padding 0.45s ease, opacity 0.4s ease;
    padding: 0 22px;
    color: var(--text-light);
    font-size: 0.95rem;
    opacity: 0;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 0 22px 22px;
    opacity: 1;
}

/* ============ HowTo 步骤 ============ */
.howto-step {
    display: flex;
    gap: 22px;
    margin-bottom: 24px;
    align-items: flex-start;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card-bg);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.howto-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(245, 158, 11, 0.35);
}

.step-num {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.15rem;
    box-shadow: 0 6px 14px -4px rgba(245, 158, 11, 0.5);
    transition: transform var(--transition);
}

.howto-step:hover .step-num {
    transform: scale(1.1) rotate(-6deg);
}

.step-content h4 {
    color: var(--primary);
    margin-bottom: 6px;
    font-size: 1.08rem;
    font-weight: 700;
}

.step-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ============ 数字动画统计 ============ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 28px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--card-bg);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.stat-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(245, 158, 11, 0.35);
}

.stat-item h3 {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 4px;
}

.stat-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ============ 面包屑 ============ */
.breadcrumb {
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 24px 0;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-light);
    text-decoration: none;
    padding: 2px 6px;
    border-radius: 6px;
    transition: color var(--transition), background var(--transition);
}

.breadcrumb a:hover {
    color: var(--accent);
    background: var(--bg-alt);
}

/* ============ 页脚 ============ */
footer {
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 56px 0 28px;
    margin-top: 72px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 36px;
    margin-bottom: 36px;
}

.footer-col h4 {
    color: var(--primary);
    margin-bottom: 18px;
    font-size: 1rem;
    font-weight: 700;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 32px;
    height: 3px;
    border-radius: 3px;
    background: var(--accent);
}

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

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition), padding-left var(--transition);
    display: inline-block;
}

.footer-col ul li a:hover {
    color: var(--accent);
    padding-left: 6px;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.9;
}

.footer-bottom a {
    color: var(--text-light);
    text-decoration: none;
    margin: 0 8px;
    transition: color var(--transition);
}

.footer-bottom a:hover {
    color: var(--accent);
}

/* ============ 返回顶部 ============ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.9);
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
    z-index: 900;
    box-shadow: 0 10px 24px -8px rgba(245, 158, 11, 0.6);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.06);
    box-shadow: 0 16px 30px -8px rgba(245, 158, 11, 0.75);
}

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

/* ============ 滚动动画 ============ */
.fade-in {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-keyword h1 {
        font-size: 2.2rem;
    }

    .banner-content h2 {
        font-size: 2rem;
    }
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .search-box input {
        width: 140px;
    }

    .search-box input:focus {
        width: 170px;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
    }

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

    .banner {
        height: 340px;
    }

    .banner-content h2 {
        font-size: 1.7rem;
    }

    .banner-content p {
        font-size: 1rem;
    }

    .hero-keyword {
        padding: 44px 20px;
    }

    .hero-keyword h1 {
        font-size: 1.9rem;
    }

    .hero-keyword p {
        font-size: 1rem;
    }
}

@media (max-width: 600px) {
    body {
        padding-top: 64px;
    }

    .nav-inner {
        height: 64px;
    }

    .mobile-menu {
        top: 64px;
    }

    .logo {
        font-size: 1.15rem;
    }

    .logo svg {
        width: 30px;
        height: 30px;
    }

    .search-box {
        display: none;
    }

    .grid-4,
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .hero-keyword {
        padding: 36px 16px;
        margin-bottom: 28px;
    }

    .hero-keyword h1 {
        font-size: 1.55rem;
    }

    .hero-keyword .highlight {
        white-space: normal;
    }

    .hero-keyword p {
        font-size: 0.95rem;
    }

    .cta-btn {
        padding: 12px 30px;
        font-size: 0.95rem;
    }

    .banner {
        height: 300px;
        margin: 16px 0;
        border-radius: var(--radius-sm);
    }

    .banner-slide {
        padding: 24px 18px;
    }

    .banner-content h2 {
        font-size: 1.4rem;
    }

    .banner-content p {
        font-size: 0.92rem;
    }

    .section-title {
        font-size: 1.45rem;
    }

    .section-sub {
        font-size: 0.92rem;
    }

    section {
        margin-bottom: 44px;
    }

    .card {
        padding: 20px;
    }

    .article-item {
        flex-direction: column;
        padding: 18px;
        gap: 14px;
    }

    .article-thumb {
        width: 100%;
        height: 150px;
    }

    .howto-step {
        flex-direction: row;
        gap: 14px;
        padding: 16px;
    }

    .step-num {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }

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

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

    .stat-item h3 {
        font-size: 2rem;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }

    .faq-question {
        padding: 15px 16px;
        font-size: 0.95rem;
    }

    .faq-answer {
        padding: 0 16px;
    }

    .faq-item.open .faq-answer {
        padding: 0 16px 16px;
    }
}

@media (max-width: 380px) {
    .hero-keyword h1 {
        font-size: 1.35rem;
    }

    .banner-content h2 {
        font-size: 1.25rem;
    }

    .section-title {
        font-size: 1.3rem;
    }
}

/* ============ 无障碍与动效偏好 ============ */
@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;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}

/* ============ 打印样式 ============ */
@media print {
    .navbar,
    .mobile-menu,
    .back-to-top,
    .banner,
    .cta-btn {
        display: none !important;
    }

    body {
        padding-top: 0;
        color: #000;
        background: #fff;
    }

    .card,
    .article-item,
    .faq-item {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}