:root {
    --brand: #6a4c9c;
    --brand-light: #9b7fd4;
    --brand-deep: #4a3170;
    --accent: #fc5c7d;
    --accent-soft: #f0c27f;
    --bg: #ffffff;
    --bg-elevated: #fdfcff;
    --text: #1e1b2b;
    --text-soft: #4a4758;
    --text-muted: #6b6b7a;
    --card-bg: rgba(248, 246, 255, 0.72);
    --card-solid: #f8f6ff;
    --border: #e0d8f0;
    --border-soft: rgba(224, 216, 240, 0.6);
    --shadow: 0 4px 20px rgba(106, 76, 156, 0.08);
    --shadow-lg: 0 12px 40px rgba(106, 76, 156, 0.14);
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-border: rgba(255, 255, 255, 0.4);
    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-brand: linear-gradient(135deg, #6a4c9c 0%, #9b7fd4 50%, #fc5c7d 100%);
    --gradient-hero: linear-gradient(135deg, rgba(106, 76, 156, 0.08) 0%, rgba(155, 127, 212, 0.06) 40%, rgba(252, 92, 125, 0.05) 100%);
    --gradient-card: linear-gradient(160deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 246, 255, 0.7) 100%);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: 80px;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--transition), color var(--transition);
}

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

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
}

::selection {
    background: rgba(106, 76, 156, 0.22);
    color: var(--brand-deep);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ============ 导航吸顶 ============ */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(18px) saturate(160%);
    -webkit-backdrop-filter: blur(18px) saturate(160%);
    border-bottom: 1px solid var(--border-soft);
    box-shadow: 0 2px 20px rgba(106, 76, 156, 0.06);
    transition: background var(--transition), border-color var(--transition);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: 16px;
}

.logo {
    font-weight: 800;
    font-size: 1.4rem;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
    white-space: nowrap;
    transition: transform var(--transition), filter var(--transition);
    user-select: none;
}

.logo:hover {
    transform: scale(1.04);
    filter: brightness(1.08);
}

.nav-links {
    display: flex;
    gap: 26px;
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-links a {
    position: relative;
    color: var(--text);
    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: var(--gradient-brand);
    transition: width var(--transition);
}

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

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

.search-box {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 30px;
    padding: 6px 8px 6px 16px;
    border: 1px solid var(--border);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
    border-color: var(--brand-light);
    box-shadow: 0 0 0 3px rgba(155, 127, 212, 0.15);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.9rem;
    width: 130px;
    color: var(--text);
    transition: width var(--transition);
}

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

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

.search-box button {
    background: var(--gradient-brand);
    border: none;
    cursor: pointer;
    color: #fff;
    font-weight: 600;
    font-size: 0.85rem;
    padding: 6px 16px;
    border-radius: 24px;
    transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

.search-box button:hover {
    transform: scale(1.04);
    box-shadow: 0 4px 14px rgba(106, 76, 156, 0.35);
    filter: brightness(1.06);
}

.menu-toggle {
    display: none;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1.4rem;
    line-height: 1;
    padding: 6px 12px;
    cursor: pointer;
    color: var(--brand);
    transition: transform var(--transition), background var(--transition);
}

.menu-toggle:hover {
    transform: scale(1.06);
    background: var(--card-solid);
}

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

.breadcrumb a {
    color: var(--brand);
    transition: color var(--transition);
}

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

.breadcrumb span {
    margin: 0 6px;
}

/* ============ 首屏 ============ */
.hero {
    position: relative;
    padding: 48px 0 72px;
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    align-items: center;
    background: var(--gradient-hero);
    border-radius: var(--radius-xl);
    margin-top: 8px;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -120px;
    right: -120px;
    width: 380px;
    height: 380px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(155, 127, 212, 0.22) 0%, transparent 70%);
    pointer-events: none;
    animation: floatBlob 12s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -140px;
    left: -100px;
    width: 320px;
    height: 320px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(252, 92, 125, 0.16) 0%, transparent 70%);
    pointer-events: none;
    animation: floatBlob 15s ease-in-out infinite reverse;
}

@keyframes floatBlob {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(24px, -24px) scale(1.08);
    }
}

.hero-content {
    flex: 1 1 400px;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 2.6rem;
    font-weight: 800;
    line-height: 1.28;
    margin-bottom: 18px;
    letter-spacing: -0.5px;
}

.hero-content h1 .highlight {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--text-soft);
    margin-bottom: 30px;
    max-width: 600px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: left;
    transition: transform var(--transition);
}

.stat-item:hover {
    transform: translateY(-3px);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hero-visual {
    flex: 1 1 300px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-visual svg {
    width: 100%;
    max-width: 380px;
    height: auto;
    filter: drop-shadow(0 16px 32px rgba(106, 76, 156, 0.18));
    animation: heroFloat 6s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-12px);
    }
}

/* ============ 区块通用 ============ */
.section {
    padding: 64px 0;
    border-bottom: 1px solid var(--border-soft);
}

.section:last-of-type {
    border-bottom: none;
}

.section-title {
    font-size: 1.9rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.3px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 48px;
    height: 4px;
    border-radius: 4px;
    background: var(--gradient-brand);
}

.section-sub {
    color: var(--text-muted);
    margin-bottom: 38px;
    font-size: 1rem;
}

/* ============ 卡片 ============ */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    position: relative;
    background: var(--gradient-card);
    backdrop-filter: blur(14px) saturate(140%);
    -webkit-backdrop-filter: blur(14px) saturate(140%);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    border: 1px solid var(--glass-border);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: linear-gradient(135deg, rgba(155, 127, 212, 0.4), rgba(252, 92, 125, 0.2), transparent 60%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(155, 127, 212, 0.5);
}

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

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

.card:hover h3 {
    color: var(--brand);
}

.card p {
    font-size: 0.92rem;
    color: var(--text-soft);
}

.card-icon {
    font-size: 2rem;
    margin-bottom: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(106, 76, 156, 0.12), rgba(252, 92, 125, 0.1));
    transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(-4deg);
    box-shadow: 0 8px 20px rgba(106, 76, 156, 0.2);
}

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

.article-item {
    position: relative;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 26px 24px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    overflow: hidden;
}

.article-item::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: var(--gradient-brand);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition);
}

.article-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(155, 127, 212, 0.45);
}

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

.article-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.article-meta time {
    position: relative;
    padding-left: 16px;
}

.article-meta time::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--brand-light);
}

.article-item h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    line-height: 1.5;
    transition: color var(--transition);
}

.article-item:hover h3 {
    color: var(--brand);
}

.article-item p {
    font-size: 0.9rem;
    color: var(--text-soft);
    margin-bottom: 14px;
}

.read-more {
    color: var(--brand);
    font-weight: 600;
    text-decoration: none;
    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);
}

/* ============ FAQ ============ */
#faqList {
    background: var(--card-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: var(--radius-lg);
    padding: 8px 28px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.faq-item {
    border-bottom: 1px solid var(--border-soft);
    padding: 16px 0;
    transition: padding var(--transition);
}

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

.faq-question {
    font-weight: 600;
    font-size: 1.05rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 8px 0;
    transition: color var(--transition);
    user-select: none;
}

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

.faq-question::after {
    content: "+";
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--brand);
    line-height: 1;
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(106, 76, 156, 0.08);
    transition: transform var(--transition), background var(--transition), color var(--transition);
}

.faq-item.open .faq-question {
    color: var(--brand);
}

.faq-item.open .faq-question::after {
    content: "−";
    transform: rotate(180deg);
    background: var(--gradient-brand);
    color: #fff;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease, opacity 0.3s ease;
    padding: 0;
    color: var(--text-soft);
    font-size: 0.95rem;
    opacity: 0;
}

.faq-item.open .faq-answer {
    max-height: 420px;
    padding: 12px 0 8px;
    opacity: 1;
}

/* ============ HowTo ============ */
.howto-steps {
    display: grid;
    gap: 20px;
    counter-reset: step;
}

.howto-step {
    position: relative;
    display: flex;
    gap: 22px;
    align-items: flex-start;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    padding: 24px 26px;
    border: 1px solid var(--border);
    border-left: 4px solid var(--brand);
    transition: transform var(--transition), box-shadow var(--transition), border-left-color var(--transition);
    overflow: hidden;
}

.howto-step::before {
    content: '';
    position: absolute;
    right: -30px;
    top: -30px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(155, 127, 212, 0.14), transparent 70%);
    pointer-events: none;
    transition: transform var(--transition);
}

.howto-step:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--accent);
}

.howto-step:hover::before {
    transform: scale(1.5);
}

.step-number {
    font-size: 1.6rem;
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    min-width: 46px;
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
}

.howto-step h4 {
    font-size: 1.05rem;
    margin-bottom: 6px;
    color: var(--text);
}

.howto-step p {
    font-size: 0.92rem;
    color: var(--text-soft);
}

/* ============ 联系与信息 ============ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}

.contact-item {
    position: relative;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-md);
    padding: 22px;
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    overflow: hidden;
}

.contact-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-brand);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(155, 127, 212, 0.45);
}

.contact-item:hover::before {
    transform: scaleX(1);
}

.contact-item strong {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 600;
    letter-spacing: 0.3px;
}

.contact-item span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    word-break: break-word;
}

/* EEAT 信息块 */
#contact > div:last-child {
    background: var(--gradient-card);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

#contact > div:last-child h3 {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ============ 页脚 ============ */
.footer {
    position: relative;
    background: linear-gradient(160deg, #1e1b2b 0%, #17141f 100%);
    color: #c5c1d0;
    padding: 56px 0 32px;
    margin-top: 48px;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -60px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(106, 76, 156, 0.25), transparent 70%);
    pointer-events: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 32px;
    position: relative;
    z-index: 1;
}

.footer h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 18px;
    position: relative;
    padding-bottom: 10px;
}

.footer h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 28px;
    height: 3px;
    border-radius: 3px;
    background: var(--gradient-brand);
}

.footer a {
    color: #a9a4b8;
    text-decoration: none;
    display: block;
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: color var(--transition), transform var(--transition);
}

.footer a:hover {
    color: #fff;
    transform: translateX(4px);
}

.footer-bottom {
    border-top: 1px solid #2f2b3a;
    margin-top: 44px;
    padding-top: 26px;
    font-size: 0.8rem;
    color: #8b869a;
    text-align: center;
    position: relative;
    z-index: 1;
}

/* ============ 返回顶部 ============ */
.back-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-brand);
    color: #fff;
    border: none;
    font-size: 1.4rem;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(106, 76, 156, 0.45);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.back-top.show {
    display: flex;
    animation: popIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.back-top:hover {
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 10px 28px rgba(106, 76, 156, 0.6);
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: scale(0.6);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ============ 暗色模式 ============ */
body.dark {
    --bg: #12101a;
    --bg-elevated: #181521;
    --text: #e8e6f0;
    --text-soft: #b8b4c8;
    --text-muted: #8b869a;
    --card-bg: rgba(30, 27, 43, 0.72);
    --card-solid: #1e1b2b;
    --border: #2f2b3a;
    --border-soft: rgba(47, 43, 58, 0.7);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --glass-bg: rgba(30, 27, 43, 0.6);
    --glass-border: rgba(155, 127, 212, 0.18);
    --gradient-card: linear-gradient(160deg, rgba(30, 27, 43, 0.9) 0%, rgba(24, 21, 33, 0.7) 100%);
    --gradient-hero: linear-gradient(135deg, rgba(106, 76, 156, 0.16) 0%, rgba(155, 127, 212, 0.1) 40%, rgba(252, 92, 125, 0.08) 100%);
}

body.dark .navbar {
    background: rgba(18, 16, 26, 0.78);
    border-bottom-color: var(--border-soft);
}

body.dark .search-box input {
    color: var(--text);
}

body.dark .footer {
    background: linear-gradient(160deg, #0d0b14 0%, #0a0910 100%);
}

body.dark .card::before {
    background: linear-gradient(135deg, rgba(155, 127, 212, 0.5), rgba(252, 92, 125, 0.3), transparent 60%);
}

body.dark ::selection {
    background: rgba(155, 127, 212, 0.35);
    color: #fff;
}

/* ============ 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: 992px) {
    .hero-content h1 {
        font-size: 2.2rem;
    }
    .nav-links {
        gap: 20px;
        font-size: 0.9rem;
    }
    .search-box input {
        width: 110px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--glass-bg);
        backdrop-filter: blur(20px) saturate(160%);
        -webkit-backdrop-filter: blur(20px) saturate(160%);
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 12px 32px rgba(106, 76, 156, 0.12);
        animation: slideDown 0.3s ease;
    }
    .nav-links.active {
        display: flex;
    }
    .nav-links a::after {
        display: none;
    }
    .menu-toggle {
        display: block;
    }
    .hero {
        padding: 32px 0 48px;
        border-radius: var(--radius-lg);
        gap: 32px;
    }
    .hero-content h1 {
        font-size: 1.9rem;
    }
    .hero-content p {
        font-size: 1rem;
    }
    .hero-stats {
        gap: 24px;
    }
    .stat-number {
        font-size: 1.6rem;
    }
    .search-box {
        display: none;
    }
    .section {
        padding: 48px 0;
    }
    .section-title {
        font-size: 1.5rem;
    }
    .card-grid,
    .article-list,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    #faqList {
        padding: 8px 20px;
    }
    .howto-step {
        padding: 20px;
        gap: 16px;
    }
    .step-number {
        font-size: 1.3rem;
        min-width: 36px;
    }
    .back-top {
        bottom: 24px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
    #about > div {
        grid-template-columns: 1fr !important;
        gap: 28px !important;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .hero-content h1 {
        font-size: 1.6rem;
    }
    .hero-stats {
        gap: 18px;
    }
    .stat-number {
        font-size: 1.4rem;
    }
    .section-title {
        font-size: 1.35rem;
    }
    .card {
        padding: 22px 20px;
    }
    .article-item {
        padding: 22px 20px;
    }
    .howto-step {
        flex-direction: column;
        gap: 10px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}

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

/* ============ 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,
    .back-top,
    .search-box,
    .menu-toggle {
        display: none !important;
    }
    body {
        background: #fff;
        color: #000;
    }
    .section {
        page-break-inside: avoid;
    }
}