:root {
    --bg-primary: #faf9f6;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f3f1ec;
    --text-primary: #1f2e26;
    --text-secondary: #2e3b32;
    --text-muted: #5d7266;
    --text-light: #8c9e93;
    --accent: #3a5f4b;
    --accent-light: #8aa79b;
    --accent-hover: #2b4a3a;
    --border-color: #eae8e3;
    --border-strong: #d9d6cf;
    --shadow-sm: 0 2px 8px rgba(58, 95, 75, 0.04);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 12px 28px rgba(58, 95, 75, 0.08);
    --shadow-xl: 0 20px 40px rgba(58, 95, 75, 0.12);
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-full: 40px;
    --glass-bg: rgba(250, 249, 246, 0.72);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-blur: blur(16px);
    --banner-gradient: linear-gradient(135deg, #e7ede9 0%, #d3dfd8 50%, #c5d5cc 100%);
    --banner-gradient-dark: linear-gradient(135deg, #2a3a32 0%, #1f2e26 50%, #182420 100%);
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

body.dark-mode {
    --bg-primary: #1a221e;
    --bg-secondary: #232e28;
    --bg-tertiary: #1f2a24;
    --text-primary: #eaf0ec;
    --text-secondary: #d6e0da;
    --text-muted: #b6c9be;
    --text-light: #9aab9f;
    --accent: #6b9b82;
    --accent-light: #8aa79b;
    --accent-hover: #7fb094;
    --border-color: #2e3f36;
    --border-strong: #3a4f43;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 14px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 12px 28px rgba(0, 0, 0, 0.25);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.3);
    --glass-bg: rgba(26, 34, 30, 0.72);
    --glass-border: rgba(255, 255, 255, 0.08);
    --banner-gradient: linear-gradient(135deg, #2a3a32 0%, #1f2e26 50%, #182420 100%);
}

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

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

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
    overflow-x: hidden;
}

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

/* ========== 导航吸顶 ========== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-strong);
    padding: 10px 0;
    transition: background var(--transition-smooth), border-color var(--transition-smooth);
}

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

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--accent);
    letter-spacing: -0.5px;
    text-decoration: none;
    transition: color var(--transition-fast);
    display: flex;
    align-items: baseline;
    gap: 2px;
}

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

.logo span {
    color: var(--accent-light);
    font-weight: 300;
    font-size: 0.75rem;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
    flex-wrap: wrap;
}

.nav-links a {
    text-decoration: none;
    color: var(--accent);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-fast), color var(--transition-fast);
    position: relative;
}

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

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

.nav-links a:hover {
    border-bottom-color: transparent;
}

.action-icons {
    display: flex;
    gap: 16px;
    align-items: center;
}

.action-icons button {
    background: none;
    border: 1px solid var(--border-strong);
    border-radius: 30px;
    padding: 6px 14px;
    font-size: 0.85rem;
    color: var(--accent);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-icons button:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    transform: translateY(-1px);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--accent);
    cursor: pointer;
    padding: 4px 8px;
    transition: transform var(--transition-fast);
}

.mobile-menu-toggle:hover {
    transform: scale(1.1);
}

/* ========== 站内搜索 ========== */
.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border-radius: 30px;
    padding: 4px 6px 4px 16px;
    border: 1px solid var(--border-strong);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(58, 95, 75, 0.1);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 6px 0;
    font-size: 0.9rem;
    outline: none;
    width: 140px;
    color: var(--text-secondary);
}

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

.search-box button {
    background: var(--accent);
    border: none;
    color: #fff;
    border-radius: 30px;
    padding: 6px 16px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.search-box button:hover {
    background: var(--accent-hover);
    transform: scale(1.03);
}

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

.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

/* ========== Banner 渐变轮播 ========== */
.banner {
    margin: 30px 0 40px;
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--banner-gradient);
    position: relative;
    min-height: 220px;
    display: flex;
    align-items: center;
    padding: 40px 48px;
    transition: background var(--transition-smooth);
    box-shadow: var(--shadow-md);
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.35) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: bannerFloat 8s ease-in-out infinite;
}

.banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(138, 167, 155, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: bannerFloat 10s ease-in-out infinite reverse;
}

@keyframes bannerFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(20px, -20px) scale(1.05); }
}

.banner-content {
    max-width: 60%;
    position: relative;
    z-index: 2;
}

.banner h1 {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    transition: color var(--transition-smooth);
}

.banner p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 24px;
    line-height: 1.8;
    transition: color var(--transition-smooth);
}

.banner-cta {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    padding: 12px 32px;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 14px rgba(58, 95, 75, 0.25);
}

.banner-cta:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(58, 95, 75, 0.35);
}

.banner-cta:active {
    transform: translateY(0);
}

/* ========== 数字动画区域 ========== */
.stats-row {
    display: flex;
    gap: 40px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
    transition: color var(--transition-smooth);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    transition: color var(--transition-smooth);
}

/* ========== 通用卡片 ========== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin: 30px 0;
}

.card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 26px 22px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), background var(--transition-smooth), border-color var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

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

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

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-primary);
    transition: color var(--transition-smooth);
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
    transition: color var(--transition-smooth);
}

.card a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.card a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* ========== 文章列表 ========== */
.article-item {
    display: flex;
    gap: 24px;
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
    transition: border-color var(--transition-smooth), background var(--transition-fast);
    border-radius: var(--radius-sm);
}

.article-item:hover {
    background: var(--bg-tertiary);
    padding-left: 12px;
    padding-right: 12px;
    margin-left: -12px;
    margin-right: -12px;
}

.article-thumb {
    flex: 0 0 100px;
    height: 100px;
    background: linear-gradient(135deg, #e1e9e4, #d3dfd8);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-light);
    font-size: 0.8rem;
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    overflow: hidden;
}

.article-item:hover .article-thumb {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

body.dark-mode .article-thumb {
    background: linear-gradient(135deg, #2e3f36, #232e28);
}

.article-info h3 {
    font-size: 1.2rem;
    margin-bottom: 6px;
    color: var(--text-primary);
    transition: color var(--transition-smooth);
}

.article-info h3 a {
    color: inherit;
    text-decoration: none;
}

.article-meta {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 8px;
    transition: color var(--transition-smooth);
}

.article-summary {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 10px;
    line-height: 1.7;
    transition: color var(--transition-smooth);
}

.read-more {
    color: var(--accent);
    font-weight: 500;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast), letter-spacing var(--transition-fast);
    display: inline-block;
}

.read-more:hover {
    color: var(--accent-hover);
    letter-spacing: 0.5px;
}

/* ========== FAQ 手风琴 ========== */
.faq-list {
    margin: 20px 0;
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
    transition: border-color var(--transition-smooth);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 0;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-primary);
    transition: color var(--transition-fast);
    user-select: none;
    gap: 16px;
}

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

.faq-question span {
    font-size: 1.4rem;
    color: var(--accent-light);
    transition: transform var(--transition-smooth), color var(--transition-fast);
    flex-shrink: 0;
    line-height: 1;
}

.faq-item.active .faq-question span {
    transform: rotate(45deg);
    color: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding var(--transition-smooth);
    color: var(--text-muted);
    padding-right: 30px;
    font-size: 0.95rem;
    line-height: 1.8;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding-bottom: 18px;
}

/* ========== HowTo 步骤 ========== */
.howto-step {
    margin: 20px 0;
    padding: 20px 24px;
    padding-left: 28px;
    border-left: 3px solid var(--accent);
    background: var(--bg-secondary);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), background var(--transition-smooth), border-color var(--transition-smooth);
}

.howto-step:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
}

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

.howto-step p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
    transition: color var(--transition-smooth);
}

/* ========== 页脚 ========== */
.site-footer {
    background: #1f2e26;
    color: #cfd9d3;
    padding: 50px 0 30px;
    margin-top: 60px;
    border-radius: var(--radius-full) var(--radius-full) 0 0;
    transition: background var(--transition-smooth);
}

body.dark-mode .site-footer {
    background: #111916;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.footer-col h4 {
    color: #fff;
    margin-bottom: 18px;
    font-size: 1rem;
    font-weight: 600;
}

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

.footer-col li {
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.footer-col a {
    color: #cfd9d3;
    text-decoration: none;
    transition: color var(--transition-fast), padding-left var(--transition-fast);
    display: inline-block;
}

.footer-col a:hover {
    color: #fff;
    padding-left: 4px;
}

.copyright {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #3a4f43;
    font-size: 0.85rem;
    color: #9aab9f;
    line-height: 1.8;
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent);
    color: #fff;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-smooth), visibility var(--transition-smooth), transform var(--transition-fast), background var(--transition-fast);
    font-size: 1.4rem;
    z-index: 999;
    line-height: 1;
}

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

.back-to-top:hover {
    background: var(--accent-hover);
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 20px rgba(58, 95, 75, 0.35);
}

.back-to-top:active {
    transform: translateY(-2px) scale(1);
}

/* ========== 滚动动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    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);
}

/* ========== 辅助类 ========== */
.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 50px 0 20px;
    letter-spacing: -0.3px;
    position: relative;
    padding-bottom: 12px;
    transition: color var(--transition-smooth);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 48px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 2px;
    transition: width var(--transition-smooth);
}

.section-title:hover::after {
    width: 80px;
}

.text-muted {
    color: var(--text-light);
    transition: color var(--transition-smooth);
}

.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
    white-space: nowrap;
}

.lazy-svg {
    display: block;
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

/* ========== 暗黑模式补充 ========== */
body.dark-mode .site-header {
    background: var(--glass-bg);
    border-bottom-color: var(--border-strong);
}

body.dark-mode .logo,
body.dark-mode .nav-links a,
body.dark-mode .action-icons button {
    color: var(--text-secondary);
}

body.dark-mode .logo span {
    color: var(--accent-light);
}

body.dark-mode .banner {
    background: var(--banner-gradient);
}

body.dark-mode .banner h1 {
    color: var(--text-primary);
}

body.dark-mode .banner p {
    color: var(--text-muted);
}

body.dark-mode .search-box {
    background: var(--bg-secondary);
    border-color: var(--border-strong);
}

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

body.dark-mode .card {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

body.dark-mode .card h3,
body.dark-mode .article-info h3,
body.dark-mode .faq-question,
body.dark-mode .howto-step h4 {
    color: var(--text-primary);
}

body.dark-mode .faq-answer,
body.dark-mode .howto-step p,
body.dark-mode .article-summary,
body.dark-mode .card p {
    color: var(--text-muted);
}

body.dark-mode .howto-step {
    background: var(--bg-secondary);
}

body.dark-mode .article-item:hover {
    background: var(--bg-tertiary);
}

body.dark-mode .section-title {
    color: var(--text-primary);
}

body.dark-mode .breadcrumb {
    color: var(--text-light);
}

/* ========== 响应式布局 ========== */
@media (max-width: 1024px) {
    .banner h1 {
        font-size: 2rem;
    }
    .banner-content {
        max-width: 75%;
    }
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 12px;
        padding: 16px 0;
        order: 3;
    }

    .nav-links.active {
        display: flex;
        animation: slideDown 0.3s ease;
    }

    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .mobile-menu-toggle {
        display: block;
        order: 2;
    }

    .header-inner {
        justify-content: space-between;
    }

    .logo {
        order: 1;
    }

    .action-icons {
        order: 2;
        gap: 10px;
    }

    .search-box input {
        width: 100px;
    }

    .search-box {
        padding: 3px 4px 3px 12px;
    }

    .search-box button {
        padding: 5px 12px;
        font-size: 0.75rem;
    }

    .banner {
        padding: 30px 24px;
        border-radius: var(--radius-lg);
        min-height: 180px;
    }

    .banner h1 {
        font-size: 1.6rem;
    }

    .banner p {
        font-size: 0.95rem;
    }

    .banner-content {
        max-width: 100%;
    }

    .banner-cta {
        padding: 10px 24px;
        font-size: 0.9rem;
    }

    .stats-row {
        gap: 24px;
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .stat-label {
        font-size: 0.8rem;
    }

    .article-item {
        flex-direction: column;
        gap: 16px;
    }

    .article-thumb {
        flex: 0 0 auto;
        width: 100%;
        height: 140px;
    }

    .article-item:hover {
        padding-left: 0;
        padding-right: 0;
        margin-left: 0;
        margin-right: 0;
    }

    .section-title {
        font-size: 1.4rem;
        margin: 36px 0 16px;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .card {
        padding: 20px 18px;
    }

    .faq-question {
        font-size: 0.95rem;
        padding: 14px 0;
    }

    .faq-answer {
        font-size: 0.9rem;
        padding-right: 16px;
    }

    .howto-step {
        padding: 16px 18px;
        padding-left: 22px;
    }

    .site-footer {
        padding: 36px 0 24px;
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }

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

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
        font-size: 1.2rem;
    }

    .breadcrumb {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .logo {
        font-size: 1.2rem;
    }

    .logo span {
        display: none;
    }

    .search-box {
        display: none;
    }

    .banner {
        padding: 24px 18px;
        margin: 20px 0 28px;
        border-radius: var(--radius-md);
    }

    .banner h1 {
        font-size: 1.35rem;
    }

    .banner p {
        font-size: 0.88rem;
        margin-bottom: 18px;
    }

    .stats-row {
        gap: 16px;
        margin-top: 20px;
    }

    .stat-number {
        font-size: 1.25rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .article-thumb {
        height: 110px;
    }

    .article-info h3 {
        font-size: 1.05rem;
    }
}

/* ========== 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;
    }
}

/* ========== 选中文字样式 ========== */
::selection {
    background: var(--accent);
    color: #fff;
}

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

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

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

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

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

/* ========== 焦点可见性 ========== */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}

button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}