:root {
    --brand-dark: #0B132B;
    --brand-primary: #6C63FF;
    --brand-primary-deep: #4A42E0;
    --brand-accent: #FF6584;
    --brand-accent-deep: #E04E6E;
    --brand-glow: rgba(108, 99, 255, 0.35);
    --bg-light: #F0F2F8;
    --bg-white: #FFFFFF;
    --bg-card: rgba(255, 255, 255, 0.72);
    --bg-card-solid: #FFFFFF;
    --bg-nav: rgba(11, 19, 43, 0.82);
    --bg-footer: #0B132B;
    --bg-glass: rgba(255, 255, 255, 0.55);
    --text-primary: #1A1F36;
    --text-secondary: #3C4257;
    --text-muted: #697386;
    --text-inverse: #FFFFFF;
    --text-inverse-muted: #C7CCE0;
    --border-light: rgba(108, 99, 255, 0.12);
    --border-glass: rgba(255, 255, 255, 0.35);
    --shadow-sm: 0 2px 8px rgba(26, 31, 54, 0.06);
    --shadow-md: 0 8px 28px rgba(26, 31, 54, 0.10);
    --shadow-lg: 0 16px 48px rgba(26, 31, 54, 0.14);
    --shadow-glow: 0 8px 32px rgba(108, 99, 255, 0.28);
    --radius-md: 14px;
    --radius-lg: 22px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    --gradient-brand: linear-gradient(135deg, #6C63FF 0%, #FF6584 100%);
    --gradient-banner: linear-gradient(135deg, #0B132B 0%, #1E2A5A 35%, #4A42E0 70%, #6C63FF 100%);
    --gradient-accent: linear-gradient(135deg, #FF6584 0%, #FF9A76 100%);
    --gradient-card: linear-gradient(135deg, rgba(108, 99, 255, 0.06) 0%, rgba(255, 101, 132, 0.04) 100%);
    --glass-blur: 18px;
}

body.dark-mode {
    --brand-dark: #060B18;
    --bg-light: #0A0F1E;
    --bg-white: #111827;
    --bg-card: rgba(26, 34, 56, 0.72);
    --bg-card-solid: #1A2238;
    --bg-nav: rgba(6, 11, 24, 0.85);
    --bg-footer: #060B18;
    --bg-glass: rgba(26, 34, 56, 0.55);
    --text-primary: #F1F3F9;
    --text-secondary: #D1D7E8;
    --text-muted: #8E99B4;
    --text-inverse: #FFFFFF;
    --text-inverse-muted: #A8B2CC;
    --border-light: rgba(108, 99, 255, 0.18);
    --border-glass: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 8px 32px rgba(108, 99, 255, 0.2);
    --gradient-banner: linear-gradient(135deg, #060B18 0%, #111827 35%, #2A2560 70%, #4A42E0 100%);
    --gradient-card: linear-gradient(135deg, rgba(108, 99, 255, 0.1) 0%, rgba(255, 101, 132, 0.06) 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, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-light);
    background-image: radial-gradient(ellipse at 20% 0%, rgba(108, 99, 255, 0.08) 0%, transparent 50%),
                      radial-gradient(ellipse at 80% 100%, rgba(255, 101, 132, 0.06) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition), color var(--transition);
    overflow-x: hidden;
}

body.dark-mode {
    background-image: radial-gradient(ellipse at 20% 0%, rgba(108, 99, 255, 0.12) 0%, transparent 50%),
                      radial-gradient(ellipse at 80% 100%, rgba(255, 101, 132, 0.08) 0%, transparent 50%);
}

::selection {
    background: var(--brand-primary);
    color: #FFFFFF;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--brand-primary);
    border-radius: 10px;
    opacity: 0.6;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--brand-primary-deep);
}

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

/* ========== 导航栏 ========== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-nav);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    box-shadow: 0 1px 0 var(--border-glass), var(--shadow-sm);
    transition: background var(--transition), box-shadow var(--transition);
}

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

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    transition: transform var(--transition-bounce);
}

.brand:hover {
    transform: scale(1.04);
}

.brand-logo {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 8px var(--brand-glow));
    transition: filter var(--transition);
}

.brand:hover .brand-logo {
    filter: drop-shadow(0 4px 16px var(--brand-glow));
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 800;
    color: #FFFFFF;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #FFFFFF 0%, #C7CCE0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-inverse-muted);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition);
    padding: 4px 0;
    position: relative;
}

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

.nav-links a:hover {
    color: #FFFFFF;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.search-input {
    padding: 8px 16px;
    border-radius: 22px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: #F1F5F9;
    font-size: 0.9rem;
    width: 180px;
    outline: none;
    transition: border-color var(--transition), background var(--transition), width var(--transition), box-shadow var(--transition);
}

.search-input::placeholder {
    color: #8E99B4;
}

.search-input:focus {
    border-color: var(--brand-primary);
    background: rgba(108, 99, 255, 0.12);
    width: 220px;
    box-shadow: 0 0 0 3px var(--brand-glow);
}

.dark-toggle {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 6px 10px;
    border-radius: 12px;
    color: #E2E8F0;
    transition: background var(--transition), transform var(--transition-bounce), border-color var(--transition);
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dark-toggle:hover {
    background: rgba(108, 99, 255, 0.25);
    border-color: var(--brand-primary);
    transform: rotate(20deg) scale(1.1);
}

.hamburger {
    display: none;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    cursor: pointer;
    font-size: 1.4rem;
    color: #E2E8F0;
    padding: 6px 10px;
    border-radius: 12px;
    line-height: 1;
    transition: background var(--transition), transform var(--transition);
}

.hamburger:hover {
    background: rgba(108, 99, 255, 0.25);
}

/* ========== 移动菜单 ========== */
.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-nav);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    z-index: 999;
    padding: 16px;
    overflow-y: auto;
    animation: slideDown 0.3s ease;
}

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

.mobile-menu.open {
    display: block;
}

.mobile-menu a {
    display: block;
    padding: 14px 18px;
    color: var(--text-inverse-muted);
    text-decoration: none;
    font-size: 1.05rem;
    border-radius: var(--radius-md);
    margin-bottom: 6px;
    transition: background var(--transition), color var(--transition), transform var(--transition);
}

.mobile-menu a:hover {
    background: rgba(108, 99, 255, 0.18);
    color: #FFFFFF;
    transform: translateX(6px);
}

/* ========== 面包屑 ========== */
.breadcrumb {
    padding: 16px 0 8px;
    font-size: 0.88rem;
    color: var(--text-muted);
}

.breadcrumb a {
    color: var(--brand-primary-deep);
    text-decoration: none;
    transition: color var(--transition);
}

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

.breadcrumb span {
    color: var(--text-muted);
}

/* ========== Banner ========== */
.banner {
    background: var(--gradient-banner);
    border-radius: var(--radius-xl);
    padding: 56px 48px;
    margin: 16px 0 40px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg), 0 0 80px rgba(108, 99, 255, 0.15);
    min-height: 320px;
    display: flex;
    align-items: center;
    isolation: isolate;
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 101, 132, 0.25) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
    animation: floatOrb 8s ease-in-out infinite;
}

.banner::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(108, 99, 255, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
    animation: floatOrb 10s ease-in-out infinite reverse;
}

@keyframes floatOrb {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

.banner-content {
    position: relative;
    z-index: 2;
    max-width: 680px;
}

.banner h1 {
    font-size: 2.4rem;
    font-weight: 800;
    color: #FFFFFF;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.banner p {
    font-size: 1.1rem;
    color: #E2E8F0;
    line-height: 1.8;
    margin-bottom: 24px;
}

.banner .banner-sub {
    font-size: 0.95rem;
    color: #C7CCE0;
    letter-spacing: 1px;
    margin-bottom: 28px;
}

.banner-cta {
    display: inline-block;
    background: var(--gradient-brand);
    color: #FFFFFF;
    padding: 14px 36px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1rem;
    transition: transform var(--transition-bounce), box-shadow var(--transition);
    box-shadow: 0 6px 24px rgba(108, 99, 255, 0.5);
    position: relative;
    overflow: hidden;
}

.banner-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.banner-cta:hover::before {
    left: 100%;
}

.banner-cta:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 10px 36px rgba(108, 99, 255, 0.6);
}

.banner-dots {
    display: flex;
    gap: 10px;
    margin-top: 32px;
}

.banner-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    cursor: pointer;
    transition: background var(--transition), transform var(--transition-bounce), width var(--transition);
    border: none;
}

.banner-dots .dot.active {
    background: #FFFFFF;
    transform: scale(1.2);
    width: 28px;
    border-radius: 6px;
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

.banner-dots .dot:hover {
    background: rgba(255, 255, 255, 0.7);
}

/* ========== 区块通用 ========== */
section {
    margin-bottom: 56px;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: 0.3px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 48px;
    height: 4px;
    background: var(--gradient-brand);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 760px;
    margin-top: 12px;
}

.section-header {
    margin-bottom: 8px;
}

/* ========== 卡片网格 ========== */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.grid-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

/* ========== 卡片（毛玻璃） ========== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-glass);
    transition: box-shadow var(--transition), transform var(--transition-bounce), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-brand);
    opacity: 0;
    transition: opacity var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md), 0 0 40px rgba(108, 99, 255, 0.1);
    transform: translateY(-5px);
    border-color: rgba(108, 99, 255, 0.25);
}

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

.card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    transition: color var(--transition);
}

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

.card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

.card a:hover {
    color: var(--brand-accent) !important;
}

/* ========== 数字统计 ========== */
.stats-row {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 24px;
    padding: 36px 24px;
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-glass);
    position: relative;
    overflow: hidden;
}

.stats-row::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(ellipse at center, rgba(108, 99, 255, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

.stat-item {
    text-align: center;
    min-width: 120px;
    position: relative;
    z-index: 1;
}

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

.stat-item:hover .stat-number {
    transform: scale(1.1);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 6px;
    font-weight: 500;
}

/* ========== 文章列表 ========== */
.article-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.article-card {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: var(--radius-lg);
    padding: 26px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-glass);
    transition: box-shadow var(--transition), transform var(--transition-bounce), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.article-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.article-card:hover {
    box-shadow: var(--shadow-md), 0 0 40px rgba(255, 101, 132, 0.08);
    transform: translateY(-4px);
    border-color: rgba(255, 101, 132, 0.2);
}

.article-card:hover::after {
    transform: scaleX(1);
}

.article-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    line-height: 1.4;
    transition: color var(--transition);
}

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

.article-card .meta {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-card p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 14px;
}

.article-card .read-more {
    font-size: 0.9rem;
    color: var(--brand-primary-deep);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: color var(--transition), gap var(--transition);
}

.article-card .read-more:hover {
    color: var(--brand-accent);
    gap: 8px;
    text-decoration: underline;
}

/* ========== FAQ ========== */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-glass);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(108, 99, 255, 0.2);
}

.faq-item.open {
    border-color: rgba(108, 99, 255, 0.3);
    box-shadow: var(--shadow-md), 0 0 30px rgba(108, 99, 255, 0.08);
}

.faq-question {
    padding: 18px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: background var(--transition), color var(--transition);
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
    line-height: 1.5;
}

.faq-question:hover {
    background: rgba(108, 99, 255, 0.06);
}

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

.faq-question .arrow {
    font-size: 0.9rem;
    transition: transform var(--transition-bounce);
    color: var(--brand-primary);
    flex-shrink: 0;
    margin-left: 12px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(108, 99, 255, 0.1);
    border-radius: 50%;
}

.faq-item.open .faq-question .arrow {
    transform: rotate(180deg);
    background: var(--brand-primary);
    color: #FFFFFF;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease, opacity 0.3s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    opacity: 0;
}

.faq-item.open .faq-answer {
    max-height: 600px;
    padding: 0 24px 22px;
    opacity: 1;
}

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

.howto-step {
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: var(--radius-lg);
    padding: 24px 24px 24px 80px;
    position: relative;
    border: 1px solid var(--border-glass);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition-bounce), border-color var(--transition);
}

.howto-step:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(6px);
    border-color: rgba(108, 99, 255, 0.25);
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 22px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--gradient-brand);
    color: #FFFFFF;
    font-weight: 800;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px var(--brand-glow);
    transition: transform var(--transition-bounce);
}

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

.howto-step h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.howto-step p {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========== 表格 ========== */
.info-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--bg-card);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-glass);
}

.info-table th {
    background: var(--gradient-banner);
    color: #FFFFFF;
    padding: 16px 20px;
    text-align: left;
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 0.3px;
}

.info-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-secondary);
    font-size: 0.93rem;
    transition: background var(--transition);
}

.info-table tr:last-child td {
    border-bottom: none;
}

.info-table tr:hover td {
    background: rgba(108, 99, 255, 0.06);
}

/* ========== 联系区块 ========== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.contact-info p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
}

.contact-info strong {
    color: var(--text-primary);
    font-weight: 600;
}

.contact-info a {
    color: var(--brand-primary-deep);
    text-decoration: none;
    transition: color var(--transition);
}

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

/* ========== 页脚 ========== */
.footer {
    background: var(--bg-footer);
    color: var(--text-inverse-muted);
    padding: 56px 0 28px;
    margin-top: 60px;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    position: relative;
    overflow: hidden;
}

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

.footer::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(108, 99, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 40px;
    position: relative;
    z-index: 1;
}

.footer h4 {
    font-size: 1rem;
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: 18px;
    position: relative;
    display: inline-block;
}

.footer h4::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--gradient-brand);
    border-radius: 2px;
}

.footer p {
    font-size: 0.9rem;
    color: var(--text-inverse-muted);
    line-height: 1.7;
    margin-bottom: 8px;
}

.footer a {
    color: #A8B2CC;
    text-decoration: none;
    font-size: 0.9rem;
    display: block;
    margin-bottom: 10px;
    transition: color var(--transition), transform var(--transition);
    position: relative;
    padding-left: 0;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 22px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    color: #8E99B4;
    position: relative;
    z-index: 1;
}

.footer-bottom a {
    color: #A8B2CC;
    display: inline;
    margin-bottom: 0;
    transition: color var(--transition);
}

.footer-bottom a:hover {
    color: #FFFFFF;
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-brand);
    color: #FFFFFF;
    border: none;
    cursor: pointer;
    font-size: 1.3rem;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 24px var(--brand-glow);
    transition: transform var(--transition-bounce), box-shadow var(--transition), opacity var(--transition);
    z-index: 900;
    line-height: 1;
}

.back-to-top.show {
    display: flex;
    animation: popIn 0.3s ease;
}

@keyframes popIn {
    from { opacity: 0; transform: scale(0.5); }
    to { opacity: 1; transform: scale(1); }
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 10px 36px var(--brand-glow);
}

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

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 900px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .article-list {
        grid-template-columns: 1fr;
    }
    .banner {
        padding: 44px 32px;
        min-height: 280px;
    }
    .banner h1 {
        font-size: 1.9rem;
    }
    .banner p {
        font-size: 1rem;
    }
    .section-title {
        font-size: 1.55rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .search-wrap {
        display: none;
    }
    .hamburger {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }
    .grid-4 {
        grid-template-columns: 1fr 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .banner {
        padding: 36px 24px;
        min-height: auto;
        border-radius: var(--radius-lg);
    }
    .banner h1 {
        font-size: 1.6rem;
    }
    .banner p {
        font-size: 0.95rem;
    }
    .banner .banner-sub {
        font-size: 0.85rem;
    }
    .banner-cta {
        padding: 12px 28px;
        font-size: 0.95rem;
    }
    .stats-row {
        padding: 28px 16px;
    }
    .stat-number {
        font-size: 2rem;
    }
    .info-table th,
    .info-table td {
        padding: 12px 14px;
        font-size: 0.88rem;
    }
    .howto-step {
        padding: 20px 20px 20px 72px;
    }
    .howto-step::before {
        left: 18px;
        top: 18px;
        width: 38px;
        height: 38px;
        font-size: 0.95rem;
    }
    .faq-question {
        padding: 16px 20px;
        font-size: 0.95rem;
    }
    .faq-answer {
        padding: 0 20px;
    }
    .faq-item.open .faq-answer {
        padding: 0 20px 18px;
    }
}

@media (max-width: 640px) {
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .banner {
        padding: 32px 20px;
    }
    .banner h1 {
        font-size: 1.4rem;
    }
    .banner p {
        font-size: 0.92rem;
    }
    .section-title {
        font-size: 1.35rem;
    }
    .stats-row {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
    .info-table {
        border-radius: var(--radius-md);
    }
    .info-table th,
    .info-table td {
        padding: 10px 12px;
        font-size: 0.82rem;
    }
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
        font-size: 1.15rem;
    }
    .card {
        padding: 22px 20px;
    }
    .article-card {
        padding: 22px 20px;
    }
}

/* ========== 可访问性焦点样式 ========== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 3px solid var(--brand-primary);
    outline-offset: 3px;
    border-radius: 4px;
}

/* ========== 减少动画偏好 ========== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .fade-in {
        opacity: 1;
        transform: none;
    }
}

/* ========== 打印样式 ========== */
@media print {
    .navbar,
    .back-to-top,
    .dark-toggle,
    .hamburger,
    .search-wrap,
    .banner-dots,
    .banner-cta {
        display: none !important;
    }
    body {
        background: #FFFFFF;
        color: #000000;
        background-image: none;
    }
    .banner {
        background: #F0F2F8;
        box-shadow: none;
    }
    .banner h1,
    .banner p,
    .banner .banner-sub {
        color: #000000;
    }
    .card,
    .article-card,
    .faq-item,
    .howto-step {
        box-shadow: none;
        border: 1px solid #CCCCCC;
        background: #FFFFFF;
    }
    .footer {
        background: #FFFFFF;
        color: #000000;
        border-radius: 0;
    }
    .footer h4,
    .footer a,
    .footer p {
        color: #000000;
    }
}