/* ========== CSS 变量 ========== */
:root {
    --color-bg: #faf8f5;
    --color-bg-secondary: #f3f0eb;
    --color-bg-card: #ffffff;
    --color-text: #1a1a2e;
    --color-text-secondary: #5a5a72;
    --color-text-muted: #7a7a90;
    --color-border: #e8e5df;
    --color-primary: #4f46e5;
    --color-primary-hover: #4338ca;
    --color-primary-light: #eef2ff;
    --color-accent: #f59e0b;
    --color-accent-light: #fffbeb;
    --color-success: #10b981;
    --color-success-light: #ecfdf5;
    --color-pink: #ec4899;
    --color-purple: #8b5cf6;
    --color-cyan: #06b6d4;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font-serif: 'Noto Serif SC', 'Georgia', serif;
    --font-sans: 'Noto Sans SC', 'Inter', -apple-system, sans-serif;
    --max-width: 1280px;
    --nav-height: 72px;
}

/* ========== 重置与基础样式 ========== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition), color var(--transition);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* ========== 区块容器 ========== */
.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-tag-light {
    color: var(--color-accent);
    background: rgba(245, 158, 11, 0.15);
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.section-title-light {
    color: #ffffff;
}

.section-desc {
    font-size: 17px;
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}

.section-desc-light {
    color: rgba(255, 255, 255, 0.7);
}

/* ========== 按钮 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-primary);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.4);
}

.btn-secondary {
    background: var(--color-bg-card);
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-text-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========== 导航栏 ========== */
/* 常驻白色毛玻璃：在深空 Hero 上也要和背景明显区分 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    z-index: 1000;
    background: rgba(250, 248, 245, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 var(--color-border);
    transition: all var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 1px 0 var(--color-border), 0 6px 20px rgba(20, 20, 43, 0.08);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 36px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
}

.nav-logo i {
    color: var(--color-primary);
    font-size: 24px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 60px;
}

.nav-link {
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-search,
.btn-menu {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 18px;
    transition: all var(--transition);
}

.btn-search:hover,
.btn-menu:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

.btn-menu {
    display: none;
}

/* ========== 移动端菜单 ========== */
.mobile-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg-card);
    box-shadow: var(--shadow-lg);
    padding: 16px 24px 24px;
    transform: translateY(-120%);
    opacity: 0;
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
}

.mobile-menu ul {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-menu li a {
    display: block;
    padding: 14px 16px;
    font-size: 16px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.mobile-menu li a:hover {
    background: var(--color-bg-secondary);
    color: var(--color-primary);
}

/* ========== 首屏横幅 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 140px 24px 120px;
    overflow: hidden;
}

.hero-bg-pattern {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% -20%, rgba(79, 70, 229, 0.06), transparent),
        radial-gradient(ellipse 60% 50% at 80% 80%, rgba(245, 158, 11, 0.05), transparent);
    pointer-events: none;
}

.hero-container {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 780px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 36px;
    animation: fadeInUp 0.6s ease-out;
}

.hero-badge i {
    color: var(--color-accent);
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(36px, 6vw, 64px);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 28px;
    animation: fadeInUp 0.6s ease-out 0.1s both;
}

.hero-highlight {
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 560px;
    margin: 0 auto 44px;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 72px;
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 56px;
    animation: fadeInUp 0.6s ease-out 0.4s both;
}

.hero-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.hero-stat-number {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
}

.hero-stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
}

.hero-stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* ========== 纯图片首屏 ========== */
.hero.hero-image-only {
    min-height: auto;
    padding: 0;
    margin-top: var(--nav-height);
}

.hero-full-image {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    max-height: calc(100vh - var(--nav-height));
}

/* ========== Hero 浮动装饰光斑 ========== */
.hero::before,
.hero::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(70px);
    opacity: 0.35;
    pointer-events: none;
    z-index: 0;
}
.hero::before {
    width: 340px;
    height: 340px;
    left: 6%;
    top: 18%;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.4), transparent 70%);
    animation: heroFloat 9s ease-in-out infinite;
}
.hero::after {
    width: 280px;
    height: 280px;
    right: 8%;
    bottom: 14%;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.32), transparent 70%);
    animation: heroFloat 12s ease-in-out infinite reverse;
}
@keyframes heroFloat {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-26px) translateX(16px); }
}

/* ========== 专题区块 ========== */
.topics {
    padding: 100px 0;
    background: var(--color-bg-secondary);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.topic-card {
    display: block;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

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

.topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

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

.topic-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: color-mix(in srgb, var(--card-color) 10%, transparent);
    color: var(--card-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 20px;
}

.topic-title {
    font-family: var(--font-serif);
    font-size: 19px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.topic-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.topic-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.topic-count {
    font-size: 13px;
    color: var(--color-text-muted);
}

.topic-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 6px;
    transition: gap var(--transition);
}

.topic-link:hover {
    gap: 10px;
}

/* ========== 文章区块 ========== */
.articles {
    padding: 100px 0;
}

.articles-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

.article-featured {
    display: grid;
    grid-template-columns: 1fr;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition);
}

.article-featured:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.article-featured-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 6px 14px;
    background: var(--color-accent);
    color: #1a1a2e;
    font-size: 12px;
    font-weight: 700;
    border-radius: var(--radius-sm);
    letter-spacing: 0.04em;
}

.article-featured-content {
    padding: 36px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-meta-top {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.article-category {
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    padding: 4px 12px;
    border-radius: 100px;
}

.article-date {
    font-size: 13px;
    color: var(--color-text-muted);
}

.article-featured-title {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 12px;
    color: var(--color-text);
}

.article-featured-excerpt {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.article-featured-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.article-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.author-avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
}

.author-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.article-read-time {
    font-size: 13px;
    color: var(--color-text-muted);
}

.articles-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.article-card {
    display: block;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

.article-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.article-card-body {
    padding: 20px;
}

.article-card-title {
    font-family: var(--font-serif);
    font-size: 17px;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 8px;
    color: var(--color-text);
}

.article-card-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
}

.article-card-footer {
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
}

/* ========== 统计区块 ========== */
.stats {
    position: relative;
    padding: 100px 0;
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #1e1b4b 100%);
    overflow: hidden;
}

.stats-bg-pattern {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(129, 140, 248, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(251, 191, 36, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.stats-grid {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-card {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all var(--transition);
}

.stat-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.stat-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin: 0 auto 16px;
}

.stat-card-number {
    font-family: var(--font-serif);
    font-size: 40px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 4px;
}

.stat-card-label {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.65);
    margin-bottom: 16px;
}

.stat-card-trend {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.stat-card-trend.up {
    background: rgba(16, 185, 129, 0.15);
    color: var(--color-success);
}

.stat-card-trend.neutral {
    background: rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.5);
}

/* ========== 订阅区块 ========== */
.subscribe {
    padding: 100px 0;
    background: var(--color-bg-secondary);
}

.subscribe-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 64px 48px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.subscribe-icon {
    font-size: 44px;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.subscribe-title {
    font-family: var(--font-serif);
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
}

.subscribe-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 480px;
    margin: 0 auto 32px;
    line-height: 1.7;
}

.subscribe-form {
    max-width: 500px;
    margin: 0 auto;
}

.subscribe-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 6px;
    transition: all var(--transition);
}

.subscribe-input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.subscribe-input-icon {
    position: absolute;
    left: 18px;
    color: var(--color-text-muted);
    font-size: 16px;
    pointer-events: none;
}

.subscribe-input {
    flex: 1;
    border: none;
    background: none;
    padding: 14px 14px 14px 44px;
    font-size: 15px;
    color: var(--color-text);
    outline: none;
    font-family: inherit;
}

.subscribe-input::placeholder {
    color: var(--color-text-muted);
}

.subscribe-btn {
    flex-shrink: 0;
    padding: 14px 28px;
    font-size: 15px;
}

.subscribe-note {
    margin-top: 16px;
    font-size: 13px;
    color: var(--color-text-muted);
}

/* ========== 资源卡片 ========== */
.folder-file-count {
    margin-left: auto;
    font-size: 12px;
    font-weight: 400;
    color: var(--color-text-muted);
}

.resource-files {
    display: flex;
    flex-direction: column;
}

.resource-file-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    color: var(--color-text);
    transition: background 0.15s;
    border-bottom: 1px solid var(--color-border);
}

.resource-file-item:last-child {
    border-bottom: none;
}

.resource-file-item:hover {
    background: var(--color-primary-light);
}

.resource-file-item .file-name {
    flex: 1;
    font-size: 14px;
}

.resource-file-item .file-size {
    font-size: 12px;
    color: var(--color-text-muted);
}

.resource-file-item .file-dl-icon {
    color: var(--color-text-muted);
    font-size: 13px;
    opacity: 0;
    transition: opacity 0.2s;
}

.resource-file-item:hover .file-dl-icon {
    opacity: 1;
    color: var(--color-primary);
}

.resource-empty-folder {
    padding: 24px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 13px;
}

/* ========== 页脚 ========== */
.footer {
    margin-top: auto !important;
    padding: 24px 0 16px;
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
}

.footer-simple {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 16px;
}

.footer-simple .footer-brand {
    max-width: 420px;
}

.footer-simple .footer-contact {
    flex-shrink: 0;
    margin-top: 0;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 56px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 6px;
}

.footer-logo i {
    color: var(--color-primary);
    font-size: 18px;
}

.footer-brand-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 0;
    max-width: 300px;
}

.footer-social {
    display: flex;
    gap: 16px;
    align-items: center;
}

.footer-contact {
    margin-top: 16px;
    margin-left: 8px;
}

.footer-contact-label {
    display: block;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
}

/* ========== 社交二维码弹窗 ========== */
.social-qr-wrapper {
    position: relative;
}

.social-qr-wrapper .social-icon-link {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
}

.social-qr-wrapper .social-icon-link:hover {
    background: var(--color-primary);
    color: #ffffff;
}

.social-qr-wrapper .qq-icon:hover { background: #12B7F5; color: #fff; }
.social-qr-wrapper .wechat-icon:hover { background: #07C160; color: #fff; }

.qr-popup {
    position: absolute;
    bottom: calc(100% + 12px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 12px;
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 100;
    text-align: center;
    white-space: nowrap;
}

.social-qr-wrapper:hover .qr-popup {
    display: block;
}

.qr-popup::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 8px solid transparent;
    border-top-color: var(--color-bg-card);
}

.qr-popup img {
    width: 130px;
    height: 130px;
    border-radius: 6px;
    display: block;
    object-fit: contain;
}

.qr-popup .qr-placeholder {
    width: 130px;
    height: 130px;
    border-radius: 6px;
    background: var(--color-bg-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: center;
    padding: 12px;
    white-space: normal;
}

.qr-popup .qr-placeholder i {
    font-size: 36px;
    color: var(--color-text-muted);
}

.qr-popup .qr-tip {
    display: block;
    margin-top: 8px;
    font-size: 12px;
    color: var(--color-text-secondary);
}

.footer-heading {
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text);
    margin-bottom: 20px;
}

.footer-links-group ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links-group li a {
    font-size: 14px;
    color: var(--color-text-secondary);
    transition: color var(--transition);
}

.footer-links-group li a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--color-border);
    font-size: 12px;
    color: var(--color-text-muted);
}

.footer-bottom-links {
    display: flex;
    gap: 14px;
}

.footer-bottom-links a {
    color: var(--color-text-muted);
    transition: color var(--transition);
}

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

/* ========== 回到顶部 ========== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition: all var(--transition);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-hover);
    transform: translateY(-4px);
}

/* ========== 动画 ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========== 响应式适配 ========== */
@media (max-width: 1024px) {

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

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

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .btn-menu {
        display: flex;
    }

    .hero {
        min-height: auto;
        padding: 140px 24px 80px;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-stat-number {
        font-size: 26px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .topics-grid {
        grid-template-columns: 1fr;
    }

    .article-featured {
        grid-template-columns: 1fr;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .subscribe-card {
        padding: 40px 24px;
    }

    .subscribe-input-wrapper {
        flex-direction: column;
        gap: 12px;
        background: none;
        border: none;
        padding: 0;
    }

    .subscribe-input-wrapper:focus-within {
        box-shadow: none;
    }

    .subscribe-input-icon {
        display: none;
    }

    .subscribe-input {
        background: var(--color-bg);
        border: 1.5px solid var(--color-border);
        border-radius: var(--radius-md);
        padding: 14px 18px;
        width: 100%;
    }

    .subscribe-input:focus {
        border-color: var(--color-primary);
    }

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

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

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}

/* ========== 登录按钮（导航栏） ========== */
.btn-login {
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
    color: #ffffff;
    background: var(--color-primary);
    transition: all var(--transition);
}

.btn-login:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-login.logged-in {
    background: var(--color-bg-secondary);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
}

.btn-login.logged-in:hover {
    background: var(--color-border);
}

/* ========== 模态框遮罩 ========== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    width: 420px;
    max-width: calc(100vw - 48px);
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    position: relative;
    transform: translateY(20px) scale(0.97);
    transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.active .modal-container {
    transform: translateY(0) scale(1);
}

/* ========== 二维码模态框 ========== */
.qr-modal-content {
    position: relative;
    padding: 24px;
    text-align: center;
    animation: qrFadeIn 0.3s ease-out;
}

@keyframes qrFadeIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.qr-modal-content .modal-close {
    position: absolute;
    top: 0;
    right: -8px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.95);
    color: #333;
    border: none;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 12px rgba(0,0,0,0.2);
    transition: transform 0.2s, background 0.2s;
}
.qr-modal-content .modal-close:hover {
    transform: scale(1.1);
    background: #fff;
}

.qr-modal-content img {
    max-width: 90vw;
    max-height: 70vh;
    width: auto;
    height: auto;
    border-radius: 8px;
    margin: 0 auto 16px;
    object-fit: contain;
}

.qr-modal-label {
    font-family: var(--font-serif);
    font-size: 16px;
    color: #fff;
    margin: 0;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 18px;
    transition: all var(--transition);
    z-index: 1;
}

.modal-close:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

/* ========== 模态框头部 ========== */
.modal-header {
    padding: 36px 36px 0;
    text-align: center;
}

.modal-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 28px;
}

.modal-logo i {
    color: var(--color-primary);
    font-size: 28px;
}

.modal-tabs {
    display: flex;
    border-bottom: 2px solid var(--color-border);
    gap: 0;
}

.modal-tab {
    flex: 1;
    padding: 14px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text-muted);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition);
}

.modal-tab:hover {
    color: var(--color-text-secondary);
}

.modal-tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* ========== 模态框内容 ========== */
.modal-body {
    padding: 28px 36px 36px;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.form-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.form-input-wrapper:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.08);
}

.form-input-icon {
    position: absolute;
    left: 14px;
    color: var(--color-text-muted);
    font-size: 15px;
    pointer-events: none;
}

.form-prefix {
    padding: 14px 0 14px 40px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    border-right: 1px solid var(--color-border);
    margin-right: 8px;
}

.form-input {
    flex: 1;
    border: none;
    background: none;
    padding: 14px 14px 14px 8px;
    font-size: 15px;
    color: var(--color-text);
    outline: none;
    font-family: inherit;
}

.form-input-wrapper:not(:has(.form-prefix)) .form-input {
    padding-left: 42px;
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

/* ========== 发送验证码按钮 ========== */
.form-input-row {
    display: flex;
    gap: 10px;
}

.btn-send-code {
    flex-shrink: 0;
    padding: 12px 18px;
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    color: var(--color-primary);
    background: var(--color-primary-light);
    white-space: nowrap;
    transition: all var(--transition);
}

.btn-send-code:hover:not(:disabled) {
    background: var(--color-primary);
    color: #ffffff;
}

.btn-send-code:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========== 登录方式切换（验证码 / 密码） ========== */
.auth-method-tabs {
    display: flex;
    gap: 6px;
    padding: 4px;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
}

.auth-method-tab {
    flex: 1;
    padding: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted);
    border-radius: calc(var(--radius-md) - 3px);
    transition: all var(--transition);
}

.auth-method-tab:hover {
    color: var(--color-text-secondary);
}

.auth-method-tab.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

/* ========== 表单标签辅助说明 ========== */
.form-label-hint {
    font-size: 12px;
    font-weight: 400;
    color: var(--color-text-muted);
}

/* ========== 表单复选框 ========== */
.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.form-checkbox input[type="checkbox"] {
    margin-top: 2px;
    width: 16px;
    height: 16px;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.form-checkbox label a {
    color: var(--color-primary);
}

.form-checkbox label a:hover {
    text-decoration: underline;
}

/* ========== 表单协议 ========== */
.form-agreement {
    text-align: center;
    margin-top: 16px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.form-agreement a {
    color: var(--color-primary);
}

.form-agreement a:hover {
    text-decoration: underline;
}

.btn-link {
    color: var(--color-primary);
    font-weight: 600;
    transition: color var(--transition);
}

.btn-link:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* ========== 全宽按钮 ========== */
.btn-block {
    width: 100%;
    justify-content: center;
    padding: 14px;
    font-size: 16px;
    border-radius: var(--radius-md);
}

/* ========== 用户下拉菜单 ========== */
.user-dropdown {
    position: fixed;
    top: calc(var(--nav-height) + 8px);
    right: 24px;
    width: 240px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1500;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s ease;
}

.user-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
}

.user-dropdown-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
    flex-shrink: 0;
}

.user-dropdown-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
}

.user-dropdown-phone {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.user-dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: 4px 0;
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    color: var(--color-text-secondary);
    transition: all var(--transition);
}

.user-dropdown-item:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

.user-dropdown-item i {
    width: 18px;
    text-align: center;
    font-size: 14px;
}

.btn-logout {
    color: #ef4444;
}

.btn-logout:hover {
    color: #dc2626;
    background: #fef2f2;
}

/* ========== 提示通知 ========== */
.toast {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(-120%);
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: #ffffff;
    z-index: 3000;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-lg);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast.success {
    background: var(--color-success);
}

.toast.error {
    background: #ef4444;
}

.toast.info {
    background: var(--color-primary);
}

/* ========== 设置页面 ========== */
.settings-page {
    max-width: 760px;
    margin: 0 auto;
    padding: 120px 24px 80px;
    min-height: 60vh;
}

.settings-page-title {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 32px;
}

.settings-page-title i {
    color: var(--color-primary);
    margin-right: 8px;
}

.settings-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    max-width: 520px;
    margin: 0 auto;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.settings-avatar-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-bottom: 36px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
}

.settings-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.25);
}

.settings-avatar-info h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 4px;
}

.settings-avatar-info p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0;
}

.settings-group {
    margin-bottom: 24px;
    text-align: left;
}

.settings-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.settings-group label i {
    margin-right: 4px;
    color: var(--color-primary);
}

.settings-group .form-input-wrapper {
    background: var(--color-bg);
}

.settings-group .form-input-wrapper.readonly {
    background: var(--color-bg-secondary);
    cursor: not-allowed;
}

.settings-group .form-input-wrapper.readonly .readonly {
    padding: 14px 14px 14px 42px;
    font-size: 14px;
    color: var(--color-text-muted);
}

.settings-group .form-input-wrapper input {
    width: 100%;
}

/* ========== 手机绑定 ========== */
.phone-code-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.phone-bind-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--color-text-secondary);
}

.btn-outline {
    flex-shrink: 0;
    padding: 10px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.btn-outline:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.settings-group-hint {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 6px;
}

.settings-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 36px;
    padding-top: 28px;
    border-top: 1px solid var(--color-border);
}

.settings-actions .btn {
    min-width: 140px;
    justify-content: center;
    padding: 12px 24px;
    font-size: 15px;
    border-radius: var(--radius-md);
}

.btn-danger {
    background: #fef2f2;
    color: #ef4444;
    border: 1.5px solid #fecaca;
    cursor: pointer;
    font-weight: 600;
    transition: all var(--transition);
}

.btn-danger:hover {
    background: #ef4444;
    color: #fff;
    border-color: #ef4444;
}

@media (max-width: 600px) {
    .settings-card {
        padding: 32px 20px;
    }

    .settings-actions {
        flex-direction: column;
        align-items: center;
    }

    .settings-actions .btn {
        width: 100%;
    }
}

/* ========== 富文本编辑器 ========== */
.editor-content {
    min-height: 400px;
    font-family: var(--font-serif);
    font-size: 16px;
    line-height: 1.8;
    padding: 20px;
    border: none;
    border-radius: 0;
    background: transparent;
    outline: none;
    cursor: text;
}

.editor-content:focus {
    box-shadow: none;
}

.editor-content:empty:before {
    content: attr(data-placeholder);
    color: var(--color-text-muted);
    pointer-events: none;
}

.editor-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 12px 0;
    display: block;
}

.editor-content blockquote {
    border-left: 3px solid var(--color-primary);
    padding: 8px 16px;
    margin: 12px 0;
    color: var(--color-text-secondary);
    background: var(--color-primary-light);
    border-radius: 0 8px 8px 0;
}

.editor-content pre {
    background: var(--color-bg-secondary);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 12px 0;
    font-size: 14px;
    line-height: 1.5;
}

.editor-content pre code {
    background: none;
    padding: 0;
    font-family: 'Consolas', 'Monaco', monospace;
}

.editor-content ul,
.editor-content ol {
    padding-left: 24px;
    margin: 8px 0;
}

.editor-content li {
    margin-bottom: 4px;
}

.editor-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: 24px 0;
}

/* ========== 编辑器模式切换 ========== */
.editor-mode-toggle {
    display: flex;
    gap: 4px;
    margin-bottom: 8px;
}

.editor-mode-btn {
    padding: 6px 16px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    background: var(--color-bg-card);
    color: var(--color-text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.editor-mode-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.editor-mode-btn.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

/* ========== 图片上传占位 ========== */
.img-uploading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 200px;
    height: 120px;
    background: var(--color-bg-secondary);
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    color: var(--color-text-muted);
    font-size: 14px;
    margin: 12px 0;
}

.img-uploading i {
    font-size: 24px;
}

.img-uploading.error {
    border-color: #ef4444;
    color: #ef4444;
    background: #fef2f2;
    cursor: pointer;
}

/* ========== 预览容器 ========== */
.preview-container {
    min-height: 400px;
    font-family: var(--font-serif);
    font-size: 16px;
    line-height: 2.1;
    padding: 20px;
    color: var(--color-text);
}

.preview-container h2 {
    font-size: 22px;
    margin: 40px 0 16px;
    font-family: var(--font-serif);
}

.preview-container h3 {
    font-size: 18px;
    margin: 32px 0 12px;
}

.preview-container p {
    margin-bottom: 16px;
}

.preview-container blockquote {
    border-left: 3px solid var(--color-primary);
    padding: 8px 16px;
    margin: 12px 0;
    color: var(--color-text-secondary);
    background: var(--color-primary-light);
    border-radius: 0 8px 8px 0;
}

.preview-container ul,
.preview-container ol {
    padding-left: 24px;
    margin: 8px 0;
}

.preview-container li {
    margin-bottom: 4px;
}

.preview-container .article-image {
    margin: 16px 0;
}

.preview-container .article-image img {
    max-width: 100%;
    border-radius: 8px;
    display: block;
}

/* ========== 图片灯箱 ========== */
.lightbox-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.lightbox-overlay.active {
    display: flex;
}

.lightbox-image {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border: none;
    border-radius: 50%;
    font-size: 22px;
    cursor: pointer;
    transition: background 0.2s;
    z-index: 10000;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ========== 打印样式 ========== */
@media print {
    .navbar,
    .mobile-menu,
    .back-to-top,
    .subscribe {
        display: none;
    }

    body {
        background: #fff;
        color: #000;
    }
}

/* ========== 404 错误页 ========== */
        .error-page {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: calc(100vh - 120px);
            padding: 40px 20px;
            text-align: center;
        }
        .error-page .error-code {
            font-size: 100px;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1;
            margin-bottom: 8px;
        }
        .error-page .error-desc {
            font-size: 18px;
            color: var(--color-text-secondary);
            margin-bottom: 32px;
        }
        .error-page .btn-home {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--color-primary);
            color: #fff;
            border-radius: 8px;
            text-decoration: none;
            font-size: 15px;
            transition: opacity .2s;
        }
        .error-page .btn-home:hover {
            opacity: .85;
        }

/* ========== 骨架屏 ========== */
.skeleton-block{background:var(--color-bg-secondary);border-radius:8px;position:relative;overflow:hidden;}
.skeleton-block::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.4),transparent);animation:skeletonShimmer 1.4s infinite;}
@keyframes skeletonShimmer{0%{transform:translateX(-100%);}100%{transform:translateX(100%);}}
.skeleton-card{background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:12px;padding:20px;margin-bottom:12px;}
.skeleton-line{height:14px;margin-bottom:10px;}
.skeleton-line.short{width:40%;}
.skeleton-line.mid{width:70%;}

/* ========== 键盘焦点可见性（无障碍） ========== */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,[tabindex]:focus-visible{
    outline:2px solid var(--color-primary);outline-offset:2px;border-radius:4px;
}

/* ========== 折叠面板（details/summary） ========== */
details > summary { list-style: none; }
details > summary::-webkit-details-marker { display: none; }
details[open] > summary i { transform: rotate(90deg); }

.topic-empty-icon {
    font-size: 48px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
}

.topic-empty h3 {
    font-family: var(--font-serif);
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.topic-empty p {
    font-size: 15px;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

/* ========== 加载/权限提示页（全站共用，自 topic.css 迁移） ========== */
.topic-page-loading {
    text-align: center;
    padding: 120px 0;
    color: var(--color-text-muted);
}

.topic-page-loading i {
    font-size: 36px;
    margin-bottom: 16px;
    color: var(--color-primary);
    display: block;
}

.topic-page-loading p {
    font-size: 16px;
}

/* ============================================================
   v33 科技感升级 —— 新引擎特性层（全部渐进增强，不支持的浏览器零影响）
   ① View Transitions API 跨页转场（Chrome 126+，其余=普通跳转）
   ② CSS scroll-driven animations：顶部阅读进度光条 / Hero 视差退场
   ③ @property 旋转光束边框 / 品牌字流光 / 按钮扫光 / HUD 角标 / 卡片星辉扫掠
   ============================================================ */

/* ----- ① 跨文档页面转场：同源导航自动 morph ----- */
@view-transition {
    navigation: auto;
}

@media (prefers-reduced-motion: no-preference) {
    ::view-transition-old(root) {
        animation: vt-page-out 0.22s cubic-bezier(0.4, 0, 0.2, 1) both;
    }

    ::view-transition-new(root) {
        animation: vt-page-in 0.3s 0.04s cubic-bezier(0.22, 1, 0.36, 1) both;
    }

    /* 品牌标为共享元素：页与页之间丝滑飞移 */
    .nav-logo {
        view-transition-name: site-logo;
    }
}

@keyframes vt-page-out {
    to {
        opacity: 0;
        transform: translateY(-12px) scale(0.996);
    }
}

@keyframes vt-page-in {
    from {
        opacity: 0;
        transform: translateY(14px) scale(0.998);
    }
}

/* ----- ② 顶部阅读进度光条：scroll(root) 时间线驱动，compositor 级零 JS（节点由 main.js 按能力注入） ----- */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    z-index: 3000;
    pointer-events: none;
    background: linear-gradient(90deg, var(--color-primary), var(--color-cyan) 55%, var(--color-purple));
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.55);
    transform-origin: 0 50%;
    transform: scaleX(0);
    opacity: 0;
}

@supports (animation-timeline: scroll()) {
    @media (prefers-reduced-motion: no-preference) {
        .scroll-progress {
            opacity: 1;
            animation: scroll-progress-grow linear both;
            animation-timeline: scroll(root);
        }

        @keyframes scroll-progress-grow {
            from { transform: scaleX(0); }
            to { transform: scaleX(1); }
        }
    }
}

/* ----- ② Hero 内容滚动视差退场：已移除 -----
   view() 时间线在部分环境会把 exit 进度误判到尽头，导致文案常驻近透明（呈现为整屏遮罩）。
   文字可见性优先，滚动时靠 3D 管线自身的运动感即可。 */

/* ----- ③ 旋转光束：注册角度自定义属性，conic-gradient 光点沿边框巡游 ----- */
@property --beam-angle {
    syntax: "<angle>";
    inherits: false;
    initial-value: 0deg;
}

@media (prefers-reduced-motion: no-preference) {
    @keyframes beam-spin {
        to { --beam-angle: 360deg; }
    }
}

@supports (mask-composite: exclude) or (-webkit-mask-composite: xor) {
    @media (prefers-reduced-motion: no-preference) {
        /* Hero 徽章：青紫双色光束绕框巡游 */
        .hero-badge {
            position: relative;
        }

        .hero-badge::after {
            content: "";
            position: absolute;
            inset: -2px;
            border-radius: inherit;
            padding: 1.5px;
            background: conic-gradient(from var(--beam-angle),
                    transparent 0deg,
                    transparent 295deg,
                    rgba(34, 211, 238, 0.65) 330deg,
                    rgba(167, 139, 250, 0.75) 350deg,
                    transparent 360deg);
            -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
            -webkit-mask-composite: xor;
            mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
            mask-composite: exclude;
            animation: beam-spin 5.2s linear infinite;
            pointer-events: none;
        }
    }
}

/* 品牌字流光：渐变背景流动（浅色/深空两套配色通用，只动 background-position） */
@media (prefers-reduced-motion: no-preference) {
    .hero-highlight {
        background-size: 220% 100%;
        animation: hl-shimmer 7s ease-in-out infinite;
    }

    @keyframes hl-shimmer {
        0%, 100% { background-position: 0% 50%; }
        50% { background-position: 100% 50%; }
    }
}

/* 主按钮扫光：hover 时一道斜向高光滑过（伪元素未被占用，安全） */
.btn-primary {
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: "";
    position: absolute;
    top: -10%;
    left: -80%;
    width: 46%;
    height: 120%;
    background: linear-gradient(105deg, transparent, rgba(255, 255, 255, 0.42), transparent);
    transform: skewX(-18deg);
    transition: left 0.55s cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
}

.btn-primary:hover::after {
    left: 135%;
}

/* 区块标签 HUD 角标：左上/右下取景框括弧 */
.section-tag {
    position: relative;
}

.section-tag::before,
.section-tag::after {
    content: "";
    position: absolute;
    width: 7px;
    height: 7px;
    opacity: 0.6;
    pointer-events: none;
}

.section-tag::before {
    top: -4px;
    left: -4px;
    border-top: 1.5px solid currentColor;
    border-left: 1.5px solid currentColor;
}

.section-tag::after {
    bottom: -4px;
    right: -4px;
    border-bottom: 1.5px solid currentColor;
    border-right: 1.5px solid currentColor;
}

/* Wiki 分类卡：hover 星辉扫掠 + 同色辉光 */
.topic-card::after {
    content: "";
    position: absolute;
    top: -60%;
    left: 0;
    width: 52%;
    height: 220%;
    background: linear-gradient(105deg, transparent, color-mix(in srgb, var(--card-color, #4f46e5) 16%, transparent), transparent);
    transform: translateX(-140%) skewX(-16deg);
    transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
    pointer-events: none;
}

.topic-card:hover::after {
    transform: translateX(320%) skewX(-16deg);
}

.topic-card:hover {
    border-color: color-mix(in srgb, var(--card-color, #4f46e5) 45%, transparent);
    box-shadow: 0 12px 40px color-mix(in srgb, var(--card-color, #4f46e5) 22%, transparent);
}

/* 移动端收敛：光束/扫光关闭，保电池与流畅 */
@media (max-width: 768px) {
    .hero-badge::after,
    .topic-card::after,
    .btn-primary::after {
        display: none;
    }
}

/* ============================================================
   v36 Hero 精致化 —— 「深空玻璃 · 细线 · 渐变微光」设计语言
   仅作用于 .hero.cosmos-active（3D 深空模式）；亮色回退态保持原样。
   原则：静态细线取代旋转光束，微交互取代花哨动画。
   ============================================================ */
:root {
    --hairline: rgba(199, 210, 254, 0.15);
    --accent-grad: linear-gradient(100deg, #818cf8, #67e8f9);
    --ease-out-soft: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ----- 徽章：轨道星标 + 玻璃细线胶囊 ----- */
.hero.cosmos-active .hero-badge {
    gap: 10px;
    padding: 9px 20px;
    border: 1px solid var(--hairline);
    border-radius: 999px;
    background: linear-gradient(160deg, rgba(15, 20, 44, 0.55), rgba(8, 11, 26, 0.38));
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 10px 30px rgba(3, 6, 18, 0.45);
    font-size: 12.5px;
    letter-spacing: 0.14em;
    color: #c9d2f6;
}

.hero .hero-badge i {
    display: none;
}

.hero .badge-mark {
    width: 15px;
    height: 15px;
    flex: none;
}

/* 停用旧的旋转光束环 */
.hero .hero-badge::after {
    display: none !important;
}

/* ----- 标题与副标题：呼吸感与克制的辉光 ----- */
.hero.cosmos-active .hero-title {
    letter-spacing: -0.015em;
    text-shadow: 0 2px 34px rgba(4, 6, 18, 0.65);
}

.hero.cosmos-active .hero-subtitle {
    color: #9aa3d0;
}

/* ----- 按钮：细线玻璃 + 渐变主按钮 + 箭头微交互 ----- */
.hero.cosmos-active .btn {
    min-width: 156px;
    height: 48px;
    border-radius: 12px;
    font-weight: 500;
    letter-spacing: 0.03em;
    transition: transform 0.45s var(--ease-out-soft),
        box-shadow 0.45s var(--ease-out-soft),
        border-color 0.3s ease,
        background 0.3s ease;
}

.hero.cosmos-active .btn-primary {
    background: linear-gradient(135deg, #6d6ff3 0%, #8b5cf6 100%);
    border: 1px solid rgba(255, 255, 255, 0.16);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.hero.cosmos-active .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 42px rgba(99, 102, 241, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.26);
}

.hero.cosmos-active .btn-secondary {
    background: rgba(148, 163, 255, 0.07);
    border: 1px solid var(--hairline);
    color: #dde3ff;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.hero.cosmos-active .btn-secondary:hover {
    transform: translateY(-2px);
    border-color: rgba(199, 210, 254, 0.38);
    background: rgba(148, 163, 255, 0.12);
    box-shadow: 0 14px 34px rgba(3, 6, 18, 0.5);
}

.hero .btn-arrow {
    display: inline-block;
    font-size: 0.82em;
    transition: transform 0.45s var(--ease-out-soft);
}

.hero .btn-primary:hover .btn-arrow {
    transform: translateX(4px);
}

/* ----- 统计：渐变衬线数字 + 小字距标签 + 发丝分隔线 ----- */
.hero.cosmos-active .hero-stats {
    gap: 44px;
}

.hero.cosmos-active .hero-stat {
    gap: 9px;
}

.hero.cosmos-active .hero-stat-number {
    font-size: 36px;
    font-weight: 600;
    line-height: 1;
    background: linear-gradient(120deg, #eef0ff, #93a5ff 55%, #67e8f9);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero.cosmos-active .hero-stat-label {
    font-size: 12px;
    letter-spacing: 0.34em;
    padding-left: 0.34em;
    color: #8d96c8;
}

.hero.cosmos-active .hero-stat-divider {
    width: 1px;
    height: 34px;
    background: linear-gradient(180deg,
        transparent,
        var(--hairline) 28%,
        rgba(103, 232, 249, 0.55) 50%,
        var(--hairline) 72%,
        transparent);
}

/* ----- 海报底图：加载期压暗，避免与 UI 抢戏 ----- */
.cosmos-stage > img {
    filter: brightness(0.8) saturate(1.05);
}

/* 移动端收敛：光束/扫光关闭，保电池与流畅 */
@media (max-width: 768px) {
    .hero-badge::after,
    .topic-card::after,
    .btn-primary::after {
        display: none;
    }
}