/* ============================================
   红黑大战棋牌官网 — 赤韵·几何 设计系统
   风格：暖白基底 + 朱红叙事 + 几何解构
   ============================================ */

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

body {
    font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    overflow-x: hidden;
    background: #FBF7F2;
    color: #2C2C2C;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* --- CSS变量 --- */
:root {
    --red: #D4262A;
    --red-dark: #A31D20;
    --red-light: #FBE8E8;
    --red-soft: #FFF5F5;
    --gold: #C9A03E;
    --gold-light: #F0E4C8;
    --gold-soft: #FDF8EF;
    --cream: #FBF7F2;
    --cream-dark: #F2EAE0;
    --charcoal: #2C2C2C;
    --gray: #6B6B6B;
    --gray-light: #E8E0D6;
    --gray-soft: #F5F0EA;
    --white: #FFFFFF;
    --shadow-sm: 0 2px 8px rgba(44, 44, 44, 0.06);
    --shadow-md: 0 8px 24px rgba(44, 44, 44, 0.08);
    --shadow-lg: 0 16px 48px rgba(44, 44, 44, 0.12);
    --shadow-red: 0 8px 24px rgba(212, 38, 42, 0.20);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.section {
    padding: 100px 0;
    position: relative;
}

.section:nth-child(even) {
    background: var(--cream-dark);
}

/* --- 装饰性几何元素 --- */
.section::before {
    display: none;
}

/* --- 导航 --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(251, 247, 242, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--gray-light);
    transition: var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.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: 1.3rem;
    text-decoration: none;
    color: var(--charcoal);
    letter-spacing: -0.3px;
    position: relative;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background: var(--red);
    color: var(--white);
    font-weight: 900;
    box-shadow: 0 2px 8px rgba(212, 38, 42, 0.3);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.main-nav a {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--charcoal);
    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: var(--red);
    transition: var(--transition);
    border-radius: 2px;
}

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

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

.nav-cta {
    padding: 10px 24px !important;
    border-radius: var(--radius-sm) !important;
    color: var(--white) !important;
    font-weight: 700 !important;
    background: var(--red) !important;
    border: none !important;
    box-shadow: 0 2px 8px rgba(212, 38, 42, 0.25);
    transition: var(--transition) !important;
}

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

.nav-cta:hover {
    background: var(--red-dark) !important;
    box-shadow: 0 4px 16px rgba(212, 38, 42, 0.35) !important;
    transform: translateY(-1px);
    color: var(--white) !important;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
    outline: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--charcoal);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Home Hero --- */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--cream);
    overflow: hidden;
    padding-top: 72px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 55%;
    height: 140%;
    background: var(--red);
    transform: skewX(-8deg);
    border-radius: 0 0 0 80px;
    opacity: 0.04;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--red), var(--gold), var(--red));
    opacity: 0.3;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 580px;
    padding: 40px 0;
}

.hero-eyebrow {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    padding: 6px 18px;
    border-radius: 50px;
    margin-bottom: 20px;
    background: var(--red-light);
    color: var(--red);
    letter-spacing: 1px;
    text-transform: uppercase;
    border: 1px solid rgba(212, 38, 42, 0.12);
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.5px;
    color: var(--charcoal);
}

.hero h1 .text-accent {
    color: var(--red);
    position: relative;
    display: inline-block;
}

.hero h1 .text-accent::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    width: 100%;
    height: 8px;
    background: var(--red-light);
    border-radius: 4px;
    z-index: -1;
}

.hero p {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 480px;
    margin-bottom: 36px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-lg);
    background: var(--cream-dark);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image::before {
    content: '♠ ♥ ♦ ♣';
    font-size: 5rem;
    color: var(--red);
    opacity: 0.15;
    letter-spacing: 20px;
    font-weight: 900;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    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;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: var(--transition);
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    color: var(--white);
    background: var(--red);
    box-shadow: var(--shadow-red);
}

.btn-primary:hover {
    background: var(--red-dark);
    box-shadow: 0 12px 32px rgba(212, 38, 42, 0.30);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: var(--shadow-red);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--red);
    color: var(--red);
}

.btn-outline:hover {
    background: var(--red);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-red);
}

/* --- 标签/标题 --- */
.section-label {
    display: inline-block;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
    color: var(--red);
    position: relative;
    padding-left: 36px;
}

.section-label::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 2px;
    background: var(--red);
    border-radius: 2px;
}

.section-title {
    font-size: 2.4rem;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.3px;
    color: var(--charcoal);
    line-height: 1.2;
}

.section-desc {
    max-width: 600px;
    color: var(--gray);
    margin-bottom: 48px;
    font-size: 1.05rem;
    line-height: 1.7;
}

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

.category-card {
    border-radius: var(--radius-md);
    padding: 32px 28px;
    background: var(--white);
    border: 1px solid var(--gray-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--red);
    border-radius: 0 2px 2px 0;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--red-light);
}

.category-card:hover::before {
    width: 6px;
}

.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: var(--red-soft);
    color: var(--red);
    transition: var(--transition);
}

.category-card:hover .card-icon {
    background: var(--red);
    color: var(--white);
    transform: scale(1.05);
}

.category-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--charcoal);
}

.category-card p {
    font-size: 0.9rem;
    color: var(--gray);
    margin-bottom: 18px;
    line-height: 1.6;
}

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

.card-link:hover {
    gap: 12px;
    color: var(--red-dark);
}

.card-link::after {
    content: '→';
    font-size: 1.1rem;
    transition: var(--transition);
}

/* --- 特性块 --- */
.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.feature-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    background: var(--gray-soft);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

.feature-image::before {
    content: '♠ ♥';
    font-size: 4rem;
    color: var(--red);
    opacity: 0.12;
    letter-spacing: 16px;
    font-weight: 900;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

.feature-text {
    padding: 20px 0;
}

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

.feature-list {
    list-style: none;
    margin-top: 24px;
}

.feature-list li {
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    color: var(--charcoal);
    border-bottom: 1px solid var(--gray-light);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: '✓';
    font-weight: 800;
    color: var(--red);
    font-size: 1.1rem;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--red-soft);
    border-radius: 50%;
    flex-shrink: 0;
}

/* --- 数据条 --- */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 32px 20px;
    border-radius: var(--radius-md);
    background: var(--white);
    border: 1px solid var(--gray-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

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

.stat-number {
    font-size: 2.6rem;
    font-weight: 900;
    color: var(--red);
    line-height: 1;
    letter-spacing: -1px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--gray);
    margin-top: 8px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

/* --- 内容墙 --- */
.content-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.content-wall-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--white);
    border: 1px solid var(--gray-light);
    transition: var(--transition);
}

.content-wall-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--red-light);
}

.content-wall-item img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: var(--transition);
}

.content-wall-item:hover img {
    transform: scale(1.03);
}

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

.content-wall-body h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--charcoal);
}

.content-wall-body p {
    font-size: 0.9rem;
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 12px;
}

.content-wall-body .card-link {
    margin-top: 8px;
}

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

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

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

.faq-item.open {
    border-color: var(--red);
    box-shadow: 0 4px 16px rgba(212, 38, 42, 0.08);
}

.faq-item .faq-question {
    padding: 20px 24px;
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--charcoal);
    transition: var(--transition);
    user-select: none;
}

.faq-item .faq-question::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 300;
    color: var(--red);
    transition: var(--transition);
}

.faq-item.open .faq-question::after {
    transform: rotate(45deg);
    color: var(--red-dark);
}

.faq-item .faq-answer {
    padding: 0 24px 20px;
    display: none;
    color: var(--gray);
    line-height: 1.7;
    font-size: 0.95rem;
}

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

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

/* --- CTA横幅 --- */
.cta-banner {
    padding: 72px 40px;
    text-align: center;
    border-radius: var(--radius-lg);
    color: var(--white);
    background: linear-gradient(135deg, var(--red) 0%, var(--red-dark) 50%, #7A1618 100%);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-red);
}

.cta-banner::before {
    content: '♠ ♥ ♦ ♣';
    position: absolute;
    top: -20%;
    right: -10%;
    font-size: 12rem;
    color: rgba(255, 255, 255, 0.04);
    font-weight: 900;
    letter-spacing: 40px;
    pointer-events: none;
    transform: rotate(-8deg);
}

.cta-banner::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--gold), var(--white), var(--gold));
    opacity: 0.3;
}

.cta-banner h2 {
    color: var(--white);
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 16px;
    position: relative;
    z-index: 2;
}

.cta-banner p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 1.05rem;
    max-width: 520px;
    margin: 0 auto 32px;
    line-height: 1.7;
    position: relative;
    z-index: 2;
}

.cta-banner .btn-primary {
    background: var(--white);
    color: var(--red);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
    position: relative;
    z-index: 2;
}

.cta-banner .btn-primary:hover {
    background: var(--gold-light);
    color: var(--red-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.20);
}

/* --- 页脚 --- */
.site-footer {
    padding: 64px 0 28px;
    background: var(--charcoal);
    color: rgba(255, 255, 255, 0.7);
}

.site-footer .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-brand .logo {
    color: var(--white);
    font-weight: 800;
}

.footer-brand .logo-icon {
    background: var(--red);
    color: var(--white);
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.55);
    max-width: 320px;
}

.footer-col h4 {
    color: var(--white);
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    position: relative;
    padding-bottom: 12px;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--red);
    border-radius: 2px;
}

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

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

.footer-col ul li a {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 48px;
    padding-top: 24px;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

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

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

.seo-description {
    max-width: 600px;
    margin: 0 auto 48px;
    color: var(--gray);
    font-size: 1.05rem;
    line-height: 1.7;
}

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

/* --- 响应式 --- */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-content {
        max-width: 100%;
        padding: 40px 0 0;
    }

    .hero h1 {
        font-size: 2.6rem;
    }

    .hero-image {
        aspect-ratio: 16/9;
    }

    .feature-block {
        gap: 40px;
    }

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

@media (max-width: 768px) {
    .section {
        padding: 72px 0;
    }

    .hero {
        min-height: auto;
        padding-top: 72px;
    }

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

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

    .hero-buttons {
        flex-direction: column;
        align-items: flex-start;
    }

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

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

    .feature-image {
        order: -1;
    }

    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

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

    .section-title {
        font-size: 1.8rem;
    }

    .cards-grid,
    .content-wall {
        grid-template-columns: 1fr;
    }

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

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

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

    /* 导航响应式 */
    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--cream);
        padding: 24px;
        flex-direction: column;
        gap: 16px;
        border-bottom: 2px solid var(--red);
        box-shadow: var(--shadow-md);
        z-index: 999;
    }

    .main-nav.open {
        display: flex;
    }

    .main-nav a {
        font-size: 1rem;
        padding: 12px 0;
        border-bottom: 1px solid var(--gray-light);
        width: 100%;
    }

    .main-nav a::after {
        display: none;
    }

    .main-nav a:hover {
        color: var(--red);
        padding-left: 8px;
    }

    .nav-cta {
        text-align: center;
        padding: 14px 24px !important;
        margin-top: 8px;
        border-radius: var(--radius-sm) !important;
    }

    .menu-toggle {
        display: flex;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-eyebrow {
        font-size: 0.7rem;
        padding: 4px 14px;
    }

    .cards-grid,
    .content-wall,
    .stats-bar {
        grid-template-columns: 1fr;
    }

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

    .stat-item {
        padding: 24px 16px;
    }

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

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .section-desc {
        font-size: 0.95rem;
        margin-bottom: 32px;
    }

    .cta-banner {
        padding: 40px 20px;
    }

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

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

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

    .faq-item .faq-question {
        padding: 16px 18px;
        font-size: 0.95rem;
    }

    .faq-item .faq-answer {
        padding: 0 18px 16px;
        font-size: 0.9rem;
    }
}

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

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

::-webkit-scrollbar-thumb {
    background: var(--gray-light);
    border-radius: 4px;
}

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

/* --- 选中高亮 --- */
::selection {
    background: var(--red);
    color: var(--white);
}

/* --- 加载动画 --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content,
.category-card,
.feature-block,
.stat-item,
.content-wall-item,
.cta-banner {
    animation: fadeInUp 0.6s ease forwards;
}

.category-card:nth-child(2) { animation-delay: 0.1s; }
.category-card:nth-child(3) { animation-delay: 0.2s; }
.category-card:nth-child(4) { animation-delay: 0.3s; }

.stat-item:nth-child(2) { animation-delay: 0.1s; }
.stat-item:nth-child(3) { animation-delay: 0.2s; }
.stat-item:nth-child(4) { animation-delay: 0.3s; }