:root {
    --brand-primary: #f7b731;
    --brand-secondary: #fa8231;
    --brand-dark: #2d3436;
    --brand-light: #f9f9f9;
    --brand-gray: #636e72;
    --brand-bg: #ffffff;
    --brand-card-bg: #ffffff;
    --brand-text: #2d3436;
    --brand-border: #e9ecef;
    --brand-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    --brand-radius: 16px;
    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    --transition: 0.25s ease;
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(255, 255, 255, 0.35);
    --glass-blur: 16px;
    --gradient-hero: linear-gradient(135deg, #fff6e0 0%, #ffe8c2 40%, #ffd9a0 100%);
    --gradient-accent: linear-gradient(135deg, #fa8231 0%, #f7b731 100%);
    --gradient-soft: linear-gradient(135deg, rgba(250, 130, 49, 0.08), rgba(247, 183, 49, 0.08));
}

[data-theme="dark"] {
    --brand-bg: #1a1a1a;
    --brand-card-bg: #252525;
    --brand-text: #f1f1f1;
    --brand-border: #3a3a3a;
    --brand-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    --brand-gray: #b0b0b0;
    --brand-light: #2d2d2d;
    --glass-bg: rgba(37, 37, 37, 0.78);
    --glass-border: rgba(255, 255, 255, 0.08);
    --gradient-hero: linear-gradient(135deg, #2a2218 0%, #33291c 40%, #3d2f1e 100%);
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--brand-bg);
    color: var(--brand-text);
    line-height: 1.7;
    font-size: 16px;
    transition: background-color var(--transition), color var(--transition);
    padding: 0;
    margin: 0;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

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

/* ========== 站点头部 · 毛玻璃吸顶 ========== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    backdrop-filter: blur(var(--glass-blur)) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    gap: 20px;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--brand-text);
    letter-spacing: -0.5px;
    transition: transform var(--transition);
}

.logo:hover {
    transform: scale(1.02);
    color: var(--brand-text);
}

.logo svg {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    transition: transform 0.4s ease;
}

.logo:hover svg {
    transform: rotate(20deg);
}

.logo span {
    color: var(--brand-secondary);
}

.logo > span > span {
    color: var(--brand-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
    list-style: none;
    flex-wrap: wrap;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--brand-text);
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition), color var(--transition);
    position: relative;
}

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

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

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

/* 移动菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--brand-border);
    border-radius: 8px;
    padding: 8px 12px;
    cursor: pointer;
    color: var(--brand-text);
    font-size: 1.2rem;
    transition: background var(--transition), transform var(--transition);
}

.menu-toggle:hover {
    background: var(--brand-light);
    transform: scale(1.05);
}

/* 搜索框 · 毛玻璃 */
.search-box {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border-radius: 40px;
    padding: 4px 12px;
    border: 1px solid var(--brand-border);
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
    border-color: var(--brand-secondary);
    box-shadow: 0 0 0 3px rgba(250, 130, 49, 0.15);
}

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

.search-box input::placeholder {
    color: var(--brand-gray);
}

.search-box button {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--brand-secondary);
    display: flex;
    align-items: center;
    padding: 4px;
    transition: transform var(--transition), color var(--transition);
}

.search-box button:hover {
    transform: scale(1.15);
    color: var(--brand-primary);
}

.theme-toggle {
    background: none;
    border: 1px solid var(--brand-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--brand-text);
    transition: background var(--transition), border-color var(--transition), transform var(--transition);
    flex-shrink: 0;
}

.theme-toggle:hover {
    background: var(--brand-light);
    transform: rotate(25deg) scale(1.05);
    border-color: var(--brand-secondary);
}

/* 面包屑 */
.breadcrumb {
    padding: 16px 0 8px;
    font-size: 0.85rem;
    color: var(--brand-gray);
}

.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 6px;
}

.breadcrumb li:not(:last-child)::after {
    content: "›";
    margin-left: 6px;
    color: var(--brand-gray);
}

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

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

/* ========== 首屏 Hero · 渐变Banner ========== */
.hero {
    padding: 40px 0 56px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    position: relative;
    border-radius: 0 0 32px 32px;
}

.hero::before {
    content: "";
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100vw;
    height: calc(100% + 40px);
    background: var(--gradient-hero);
    z-index: -1;
    border-radius: 0 0 40px 40px;
    opacity: 0.9;
    transition: background var(--transition);
}

.hero-content h1 {
    font-size: 2.6rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -1px;
    animation: heroFadeUp 0.8s ease both;
}

.hero-content h1 span {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: var(--brand-secondary);
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--brand-gray);
    margin-bottom: 24px;
    max-width: 540px;
    animation: heroFadeUp 0.8s ease 0.15s both;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    animation: heroFadeUp 0.8s ease 0.3s both;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    font-family: inherit;
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.btn:hover::after {
    transform: translateX(100%);
}

.btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 8px 20px rgba(250, 130, 49, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 28px rgba(250, 130, 49, 0.42);
    color: #fff;
}

.btn-outline {
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    color: var(--brand-text);
    border: 2px solid var(--brand-border);
}

.btn-outline:hover {
    border-color: var(--brand-secondary);
    color: var(--brand-secondary);
    transform: translateY(-3px);
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.08);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: heroFadeUp 0.8s ease 0.25s both;
}

/* ========== 轮播 · 毛玻璃卡片 ========== */
.carousel {
    position: relative;
    width: 100%;
    border-radius: var(--brand-radius);
    overflow: hidden;
    box-shadow: var(--brand-shadow);
    background: var(--glass-bg);
    -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
    backdrop-filter: blur(var(--glass-blur)) saturate(160%);
    border: 1px solid var(--glass-border);
}

.carousel-track {
    display: flex;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-slide {
    min-width: 100%;
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: transparent;
}

.carousel-slide svg {
    width: 100%;
    max-width: 280px;
    height: auto;
    margin-bottom: 16px;
    transition: transform 0.5s ease;
}

.carousel-slide:hover svg {
    transform: scale(1.06) rotate(-2deg);
}

.carousel-slide h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    transition: color var(--transition);
}

.carousel-slide:hover h3 {
    color: var(--brand-secondary);
}

.carousel-slide p {
    color: var(--brand-gray);
    font-size: 0.95rem;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 16px 0;
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--brand-border);
    border: none;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition), width var(--transition);
}

.carousel-dot.active {
    background: var(--gradient-accent);
    transform: scale(1.2);
    width: 26px;
    border-radius: 6px;
}

/* ========== 数字动画 ========== */
.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 48px 0;
    border-top: 1px solid var(--brand-border);
    border-bottom: 1px solid var(--brand-border);
}

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

.stat-item:hover {
    transform: translateY(-4px);
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

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

/* ========== 通用区块 ========== */
.section {
    padding: 64px 0;
}

.section-header {
    margin-bottom: 40px;
    max-width: 720px;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 56px;
    height: 4px;
    border-radius: 4px;
    background: var(--gradient-accent);
}

.section-header p {
    color: var(--brand-gray);
    font-size: 1.05rem;
}

/* ========== 圆角卡片 ========== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

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

.card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s ease;
}

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

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
    border-color: rgba(250, 130, 49, 0.3);
}

.card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    font-weight: 600;
    transition: color var(--transition);
}

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

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

/* ========== 文章列表 ========== */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.article-item {
    background: var(--brand-card-bg);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    padding: 20px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.article-item::after {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--gradient-soft);
    opacity: 0;
    transition: opacity var(--transition);
    pointer-events: none;
}

.article-item:hover::after {
    opacity: 1;
}

.article-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--brand-shadow);
    border-color: rgba(250, 130, 49, 0.3);
}

.article-item h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    line-height: 1.4;
    position: relative;
    z-index: 1;
    transition: color var(--transition);
}

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

.article-meta {
    font-size: 0.8rem;
    color: var(--brand-gray);
    margin-bottom: 10px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.article-item p {
    color: var(--brand-gray);
    font-size: 0.9rem;
    flex: 1;
    position: relative;
    z-index: 1;
}

.read-more {
    margin-top: 14px;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    position: relative;
    z-index: 1;
    transition: gap var(--transition), color var(--transition);
}

.read-more:hover {
    gap: 10px;
    color: var(--brand-primary);
}

/* ========== FAQ ========== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--brand-border);
    padding: 8px 0;
    transition: border-color var(--transition);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 16px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--brand-text);
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    transition: color var(--transition), padding var(--transition);
}

.faq-question:hover {
    color: var(--brand-secondary);
    padding-left: 6px;
}

.faq-question .icon {
    font-size: 1.4rem;
    font-weight: 400;
    line-height: 1;
    color: var(--brand-secondary);
    transition: transform var(--transition);
    flex-shrink: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease, opacity 0.3s ease;
    color: var(--brand-gray);
    font-size: 0.95rem;
    line-height: 1.8;
    opacity: 0;
}

.faq-answer.open {
    max-height: 600px;
    padding-bottom: 16px;
    opacity: 1;
}

/* ========== HowTo ========== */
.howto-steps {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 32px 24px;
    counter-reset: step;
    padding-top: 16px;
}

.howto-step {
    background: var(--brand-card-bg);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    padding: 24px;
    position: relative;
    counter-increment: step;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.howto-step:hover {
    transform: translateY(-6px);
    box-shadow: var(--brand-shadow);
    border-color: rgba(250, 130, 49, 0.35);
}

.howto-step::before {
    content: counter(step);
    position: absolute;
    top: -16px;
    left: 20px;
    background: var(--gradient-accent);
    color: #fff;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    box-shadow: 0 6px 16px rgba(250, 130, 49, 0.35);
    transition: transform var(--transition);
}

.howto-step:hover::before {
    transform: scale(1.12) rotate(-8deg);
}

.howto-step h4 {
    margin-top: 8px;
    margin-bottom: 8px;
    font-size: 1.05rem;
    transition: color var(--transition);
}

.howto-step:hover h4 {
    color: var(--brand-secondary);
}

.howto-step p {
    color: var(--brand-gray);
    font-size: 0.9rem;
}

/* ========== 团队/EEAT ========== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
}

.team-member {
    background: var(--brand-card-bg);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    padding: 24px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}

.team-member:hover {
    transform: translateY(-6px);
    box-shadow: var(--brand-shadow);
}

.team-member svg {
    width: 80px;
    height: 80px;
    margin: 0 auto 12px;
    border-radius: 50%;
    transition: transform var(--transition);
}

.team-member:hover svg {
    transform: scale(1.08);
}

.team-member h4 {
    font-size: 1.05rem;
    margin-bottom: 4px;
}

.team-member p {
    color: var(--brand-gray);
    font-size: 0.85rem;
}

/* ========== 联系方式 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 24px;
}

.contact-item {
    background: var(--brand-card-bg);
    border: 1px solid var(--brand-border);
    border-radius: var(--brand-radius);
    padding: 24px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.contact-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--brand-shadow);
    border-color: rgba(250, 130, 49, 0.35);
}

.contact-item svg {
    width: 40px;
    height: 40px;
    margin: 0 auto 12px;
    transition: transform var(--transition);
}

.contact-item:hover svg {
    transform: scale(1.15) translateY(-2px);
}

.contact-item h4 {
    font-size: 1rem;
    margin-bottom: 6px;
    transition: color var(--transition);
}

.contact-item:hover h4 {
    color: var(--brand-secondary);
}

.contact-item p {
    color: var(--brand-gray);
    font-size: 0.9rem;
}

/* ========== 页脚 ========== */
.site-footer {
    background: var(--brand-light);
    border-top: 1px solid var(--brand-border);
    padding: 48px 0 24px;
    transition: background var(--transition), border-color var(--transition);
    position: relative;
}

.site-footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
}

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

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    font-weight: 600;
}

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

.footer-col li {
    margin-bottom: 8px;
}

.footer-col a {
    color: var(--brand-gray);
    font-size: 0.9rem;
    transition: color var(--transition), padding-left var(--transition);
    display: inline-block;
}

.footer-col a:hover {
    color: var(--brand-secondary);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid var(--brand-border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--brand-gray);
}

.footer-bottom a {
    color: var(--brand-gray);
}

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

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-accent);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(250, 130, 49, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-5px) scale(1.06);
    box-shadow: 0 14px 30px rgba(250, 130, 49, 0.55);
}

/* ========== 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) {
    .hero-content h1 {
        font-size: 2.3rem;
    }
    .nav-links {
        gap: 20px;
    }
}

@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 32px 0 48px;
    }
    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-actions {
        justify-content: center;
    }
    .stats-row {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero::before {
        border-radius: 0 0 28px 28px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 16px 0;
        border-top: 1px solid var(--brand-border);
    }
    .nav-links.open {
        display: flex;
        animation: navSlideDown 0.3s ease both;
    }
    @keyframes navSlideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    .nav-links a::after {
        display: none;
    }
    .menu-toggle {
        display: flex;
    }
    .header-inner {
        flex-wrap: wrap;
    }
    .search-box {
        order: 3;
        width: 100%;
    }
    .search-box input {
        width: 100%;
    }
    .hero-content h1 {
        font-size: 2rem;
    }
    .section-header h2 {
        font-size: 1.6rem;
    }
    .stats-row {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
        padding: 32px 0;
    }
    .stat-number {
        font-size: 1.8rem;
    }
    .section {
        padding: 48px 0;
    }
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
    .carousel-slide {
        padding: 32px 20px;
    }
}

@media (max-width: 480px) {
    .stats-row {
        grid-template-columns: 1fr;
    }
    .hero-content h1 {
        font-size: 1.7rem;
        letter-spacing: -0.5px;
    }
    .hero-content p {
        font-size: 1rem;
    }
    .btn {
        width: 100%;
        justify-content: center;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .card-grid,
    .article-list,
    .howto-steps,
    .contact-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }
    .section-header h2 {
        font-size: 1.4rem;
    }
    .stat-number {
        font-size: 1.6rem;
    }
    .carousel-slide h3 {
        font-size: 1.1rem;
    }
}

/* ========== 隐藏辅助 ========== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ========== 减少动画偏好 ========== */
@media (prefers-reduced-motion: reduce) {
    * {
        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 {
    .site-header,
    .back-to-top,
    .carousel-dots,
    .hero-actions,
    .search-box,
    .theme-toggle,
    .menu-toggle {
        display: none !important;
    }
    .hero::before {
        display: none;
    }
    body {
        color: #000;
        background: #fff;
    }
    .card,
    .article-item {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}