/* ============================================================
   Ice Crystal Fragmentism — 冰锋解构设计系统
   冰球突破 · 冰球突破豪华版免费试玩 · bingqiutupo66.cn
   风格：冰晶玻璃态 + 几何解构 + 冰火对比
   ============================================================ */

/* ---------- 基础重置 ---------- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    overflow-x: hidden;
    background: #F6FAFC;
    color: #1A3344;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ---------- 设计令牌 (CSS变量) ---------- */
:root {
    --ice-white: #F6FAFC;
    --ice-blue-light: #EAF1F7;
    --ice-blue-mist: #D4E6F0;
    --ice-blue: #6BB5D9;
    --ice-blue-dark: #2C5F7C;
    --ocean-deep: #1A3344;
    --coral-fire: #FF6B4A;
    --coral-glow: #FF8B6F;
    --coral-soft: #FFB896;
    --pure-white: #FFFFFF;
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(107, 181, 217, 0.22);
    --glass-shadow: rgba(107, 181, 217, 0.08);
    --text-primary: #1A3344;
    --text-secondary: rgba(26, 51, 68, 0.7);
    --text-light: rgba(26, 51, 68, 0.5);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    --font-display: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* ---------- 核心布局 ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
}

.section {
    padding: 80px 0;
    position: relative;
}

.section:nth-child(even) {
    background: #EAF1F7;
}

/* ---------- 全局装饰：冰晶斜角 ---------- */
.section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--ice-blue), var(--coral-fire), transparent);
    opacity: 0.15;
    pointer-events: none;
}

/* ---------- 导航 ---------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(18px) saturate(1.2);
    -webkit-backdrop-filter: blur(18px) saturate(1.2);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}

.site-header:hover {
    border-bottom-color: rgba(107, 181, 217, 0.35);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.25rem;
    text-decoration: none;
    color: var(--text-primary);
    letter-spacing: -0.5px;
    position: relative;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    background: linear-gradient(135deg, var(--ice-blue), var(--ice-blue-dark));
    color: #fff;
    clip-path: polygon(20% 0%, 80% 0%, 100% 30%, 100% 70%, 80% 100%, 20% 100%, 0% 70%, 0% 30%);
    position: relative;
    overflow: hidden;
}

.logo-icon::after {
    content: '';
    position: absolute;
    top: -30%;
    left: -30%;
    width: 60%;
    height: 60%;
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(25deg);
    filter: blur(4px);
}

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

.main-nav a {
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 4px 0;
    letter-spacing: 0.3px;
}

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

.main-nav a:hover {
    color: var(--text-primary);
}

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

.nav-cta {
    padding: 10px 24px !important;
    border-radius: var(--radius-sm) !important;
    color: #fff !important;
    font-weight: 700 !important;
    background: linear-gradient(135deg, var(--coral-fire), var(--coral-glow));
    box-shadow: 0 4px 16px rgba(255, 107, 74, 0.25);
    transition: var(--transition) !important;
    clip-path: polygon(8px 0%, 100% 0%, 100% 100%, 0% 100%, 0% 8px);
    letter-spacing: 0.5px !important;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(255, 107, 74, 0.35);
    color: #fff !important;
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: var(--transition);
}

.menu-toggle:hover {
    border-color: var(--ice-blue);
}

/* ---------- Hero ---------- */
.hero {
    min-height: 75vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(165deg, #F6FAFC 0%, #EAF1F7 40%, #D4E6F0 100%);
    overflow: hidden;
    padding-top: 72px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(107, 181, 217, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -15%;
    left: -5%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 107, 74, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 2px;
    padding: 6px 18px;
    border-radius: 0;
    margin-bottom: 18px;
    background: linear-gradient(135deg, rgba(107, 181, 217, 0.15), rgba(255, 107, 74, 0.1));
    color: var(--ice-blue-dark);
    border-left: 3px solid var(--coral-fire);
    text-transform: uppercase;
}

.hero h1 {
    font-size: 3.2rem;
    line-height: 1.15;
    margin-bottom: 18px;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-primary);
    position: relative;
    display: inline-block;
}

.hero h1::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--ice-blue), var(--coral-fire));
    border-radius: 2px;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin-bottom: 34px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.hero-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    z-index: 2;
    background: var(--ice-blue-mist);
    clip-path: polygon(6% 0%, 100% 0%, 100% 94%, 94% 100%, 0% 100%, 0% 6%);
    box-shadow: 0 20px 60px rgba(107, 181, 217, 0.15), 0 8px 24px rgba(0, 0, 0, 0.04);
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.hero-image:hover img {
    transform: scale(1.03);
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-weight: 700;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.92rem;
    letter-spacing: 0.3px;
    position: relative;
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--coral-fire), var(--coral-glow));
    box-shadow: 0 4px 20px rgba(255, 107, 74, 0.3);
    clip-path: polygon(12px 0%, 100% 0%, 100% 100%, 0% 100%, 0% 12px);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(255, 107, 74, 0.4);
}

.btn-primary:active {
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid;
    border-color: var(--ice-blue);
    color: var(--ice-blue-dark);
    clip-path: polygon(12px 0%, 100% 0%, 100% 100%, 0% 100%, 0% 12px);
}

.btn-outline:hover {
    background: rgba(107, 181, 217, 0.08);
    border-color: var(--ice-blue-dark);
    transform: translateY(-3px);
}

/* ---------- 标签/标题 ---------- */
.section-label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 14px;
    text-transform: uppercase;
    color: var(--ice-blue);
    position: relative;
    padding-left: 40px;
}

.section-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 28px;
    height: 2px;
    background: linear-gradient(90deg, var(--coral-fire), var(--ice-blue));
    transform: translateY(-50%);
}

.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    line-height: 1.2;
}

.section-desc {
    max-width: 620px;
    color: var(--text-secondary);
    margin-bottom: 44px;
    font-size: 1.05rem;
    line-height: 1.7;
}

/* ---------- 卡片网格 ---------- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
    gap: 24px;
}

.category-card {
    border-radius: var(--radius-md);
    padding: 32px 28px;
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, transparent 50%, rgba(107, 181, 217, 0.08) 50%);
    pointer-events: none;
}

.category-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--ice-blue), var(--coral-fire), transparent);
    opacity: 0;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px var(--glass-shadow), 0 4px 12px rgba(0, 0, 0, 0.02);
    border-color: rgba(107, 181, 217, 0.35);
}

.category-card:hover::after {
    opacity: 1;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    font-size: 1.4rem;
    background: linear-gradient(135deg, rgba(107, 181, 217, 0.12), rgba(255, 107, 74, 0.08));
    color: var(--ice-blue-dark);
    clip-path: polygon(20% 0%, 80% 0%, 100% 20%, 100% 80%, 80% 100%, 20% 100%, 0% 80%, 0% 20%);
}

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

.category-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 16px;
}

.card-link {
    font-weight: 700;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--coral-fire);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.card-link:hover {
    color: var(--coral-glow);
    gap: 10px;
}

/* ---------- 特性块 ---------- */
.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}

.feature-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--ice-blue-mist);
    clip-path: polygon(4% 0%, 100% 0%, 100% 96%, 96% 100%, 0% 100%, 0% 4%);
    box-shadow: 0 16px 48px rgba(107, 181, 217, 0.12);
}

.feature-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.feature-image:hover img {
    transform: scale(1.04);
}

.feature-text h3 {
    font-size: 1.7rem;
    font-weight: 800;
    margin-bottom: 14px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.feature-text p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    font-weight: 500;
}

.feature-list li::before {
    content: '◆';
    font-weight: 400;
    color: var(--coral-fire);
    font-size: 0.6rem;
    display: flex;
    align-items: center;
}

/* ---------- 数据条 ---------- */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    text-align: center;
}

.stat-item {
    padding: 28px 20px;
    border-radius: var(--radius-md);
    background: var(--pure-white);
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--ice-blue), var(--coral-fire));
    opacity: 0;
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 28px var(--glass-shadow);
    border-color: rgba(107, 181, 217, 0.3);
}

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

.stat-number {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -1px;
    line-height: 1.1;
}

.stat-number::after {
    content: '+';
    color: var(--coral-fire);
    font-weight: 600;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 8px;
    font-weight: 500;
}

/* ---------- 内容墙 ---------- */
.content-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
    gap: 24px;
}

.content-wall-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--pure-white);
    border: 1px solid var(--glass-border);
    transition: var(--transition);
    position: relative;
}

.content-wall-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--ice-blue), var(--coral-fire));
    opacity: 0;
    transition: var(--transition);
}

.content-wall-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 36px var(--glass-shadow);
    border-color: rgba(107, 181, 217, 0.3);
}

.content-wall-item:hover::after {
    opacity: 1;
}

.content-wall-item img {
    width: 100%;
    height: 210px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.content-wall-item:hover img {
    transform: scale(1.04);
}

.content-wall-body {
    padding: 22px 24px 26px;
}

.content-wall-body h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.content-wall-body p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.content-wall-body .card-link {
    font-size: 0.8rem;
}

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

.faq-item {
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    overflow: hidden;
    cursor: pointer;
    background: var(--pure-white);
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(107, 181, 217, 0.35);
    box-shadow: 0 4px 16px var(--glass-shadow);
}

.faq-item .faq-question {
    padding: 18px 24px;
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.faq-item .faq-question::after {
    content: '▾';
    font-size: 1.2rem;
    color: var(--ice-blue);
    transition: var(--transition);
    font-weight: 400;
}

.faq-item.open .faq-question::after {
    transform: rotate(180deg);
    color: var(--coral-fire);
}

.faq-item .faq-answer {
    padding: 0 24px 18px;
    display: none;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.92rem;
}

.faq-item.open .faq-answer {
    display: block;
    animation: fadeSlide 0.3s ease;
}

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

/* ---------- CTA横幅 ---------- */
.cta-banner {
    padding: 64px 32px;
    text-align: center;
    border-radius: var(--radius-lg);
    color: #fff;
    background: linear-gradient(135deg, var(--ice-blue-dark) 0%, #1A3344 50%, var(--ocean-deep) 100%);
    position: relative;
    overflow: hidden;
    clip-path: polygon(3% 0%, 100% 0%, 100% 97%, 97% 100%, 0% 100%, 0% 3%);
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(107, 181, 217, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.cta-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 107, 74, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.cta-banner h2 {
    color: #fff;
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 14px;
    position: relative;
    z-index: 1;
}

.cta-banner p {
    color: rgba(255, 255, 255, 0.7);
    max-width: 500px;
    margin: 0 auto 28px;
    position: relative;
    z-index: 1;
    font-size: 1.05rem;
}

.cta-banner .btn-primary {
    background: #fff;
    color: var(--ice-blue-dark);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    clip-path: polygon(12px 0%, 100% 0%, 100% 100%, 0% 100%, 0% 12px);
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    background: #f8f8f8;
}

/* ---------- 页脚 ---------- */
.site-footer {
    padding: 64px 0 28px;
    background: var(--ocean-deep);
    color: rgba(255, 255, 255, 0.85);
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--ice-blue), var(--coral-fire), var(--ice-blue), var(--coral-fire));
    background-size: 300% 100%;
    animation: shimmer 6s linear infinite;
}

@keyframes shimmer {
    0% { background-position: 0% 0%; }
    100% { background-position: 300% 0%; }
}

.site-footer .container {
    position: relative;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
}

.footer-brand h4 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 14px;
    color: #fff;
    letter-spacing: -0.3px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.55);
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 300px;
}

.footer-col h5 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.5);
}

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

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

.footer-col ul a {
    color: rgba(255, 255, 255, 0.65);
    text-decoration: none;
    font-size: 0.88rem;
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--coral-fire);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    margin-top: 48px;
    padding-top: 22px;
    text-align: center;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.35);
}

/* ---------- 工具类 ---------- */
.text-accent {
    color: var(--coral-fire);
}

.text-center {
    text-align: center;
}

.seo-description {
    max-width: 620px;
    margin: 0 auto 48px;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
}

.mt-0 {
    margin-top: 0;
}

.mb-0 {
    margin-bottom: 0;
}

/* ---------- 补充组件样式 ---------- */

/* 冰晶装饰线 */
.ice-divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--ice-blue), var(--coral-fire));
    border-radius: 2px;
    margin: 20px 0 24px;
}

.ice-divider.center {
    margin-left: auto;
    margin-right: auto;
}

/* 玻璃态卡片变体 */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 28px;
    transition: var(--transition);
}

.glass-card:hover {
    border-color: rgba(107, 181, 217, 0.35);
    box-shadow: 0 8px 32px var(--glass-shadow);
}

/* 斜角标签 */
.angle-tag {
    display: inline-block;
    padding: 4px 16px;
    background: linear-gradient(135deg, rgba(107, 181, 217, 0.1), rgba(255, 107, 74, 0.06));
    border-left: 3px solid var(--coral-fire);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--ice-blue-dark);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .hero h1 {
        font-size: 2.6rem;
    }

    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-image {
        order: -1;
        max-width: 600px;
        margin: 0 auto;
    }

    .section-title {
        font-size: 2rem;
    }

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

@media (max-width: 768px) {
    .feature-block {
        grid-template-columns: 1fr;
        gap: 32px;
    }

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

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

    .main-nav {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .main-nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--glass-bg);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
        padding: 24px 28px;
        border-bottom: 1px solid var(--glass-border);
        gap: 18px;
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.04);
    }

    .main-nav.open a {
        font-size: 1rem;
        padding: 8px 0;
    }

    .main-nav.open .nav-cta {
        display: inline-flex;
        align-self: flex-start;
        margin-top: 4px;
    }

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

    .hero {
        min-height: 60vh;
        padding-top: 80px;
    }

    .section {
        padding: 56px 0;
    }

    .section-title {
        font-size: 1.7rem;
    }

    .cta-banner {
        padding: 48px 24px;
    }

    .cta-banner h2 {
        font-size: 1.6rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .cards-grid,
    .content-wall {
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .cards-grid,
    .content-wall,
    .stats-bar {
        grid-template-columns: 1fr;
    }

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

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

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

    .section-title {
        font-size: 1.4rem;
    }

    .header-inner {
        height: 64px;
    }

    .logo {
        font-size: 1.05rem;
    }

    .logo-icon {
        width: 34px;
        height: 34px;
        font-size: 0.9rem;
    }

    .stat-item {
        padding: 20px 16px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

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

    .content-wall-body {
        padding: 18px 18px 22px;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.85rem;
    }

    .cta-banner {
        padding: 36px 18px;
    }

    .cta-banner h2 {
        font-size: 1.3rem;
    }

    .site-footer {
        padding: 40px 0 20px;
    }
}

/* ---------- 滚动条美化 ---------- */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--ice-white);
}

::-webkit-scrollbar-thumb {
    background: var(--ice-blue-mist);
    border-radius: 4px;
}

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

/* ---------- 选择高亮 ---------- */
::selection {
    background: rgba(107, 181, 217, 0.25);
    color: var(--text-primary);
}

/* ---------- 焦点样式 ---------- */
:focus-visible {
    outline: 2px solid var(--coral-fire);
    outline-offset: 3px;
    border-radius: 2px;
}