/* ===== 全局变量与重置 ===== */
:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #f43f5e;
    --accent: #fbbf24;
    --bg: #fafafa;
    --bg-dark: #0f172a;
    --bg-card: #ffffff;
    --bg-card-dark: #1e293b;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-on-dark: #f1f5f9;
    --text-on-dark-secondary: #94a3b8;
    --border: #e2e8f0;
    --border-dark: #334155;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -2px rgba(0,0,0,.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -4px rgba(0,0,0,.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1), 0 8px 10px -6px rgba(0,0,0,.1);
    --radius: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: .3s cubic-bezier(.4,0,.2,1);
}

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font: inherit; }
img { max-width: 100%; display: block; }

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: rgba(250,250,250,.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}
.navbar.scrolled { border-bottom-color: var(--border); }

.nav-container {
    max-width: 1200px; margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}

.nav-logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; }
.logo-icon { font-size: 24px; }
.logo-text { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }

.nav-links { display: flex; gap: 32px; }
.nav-link {
    font-size: 14px; font-weight: 500; color: var(--text-secondary);
    transition: var(--transition); position: relative;
}
.nav-link::after {
    content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
    background: var(--primary); border-radius: 1px; transition: var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--text); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 12px; }
.search-btn {
    width: 36px; height: 36px; border-radius: 8px; display: flex; align-items: center; justify-content: center;
    color: var(--text-secondary); transition: var(--transition);
}
.search-btn:hover { background: var(--border); color: var(--text); }

.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; width: 36px; height: 36px; align-items: center; justify-content: center; }
.mobile-menu-btn span { display: block; width: 20px; height: 2px; background: var(--text); border-radius: 1px; transition: var(--transition); }

/* 搜索覆盖层 */
.search-overlay {
    position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(250,250,250,.95); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px; transform: translateY(-100%); opacity: 0;
    transition: var(--transition); pointer-events: none;
}
.search-overlay.active { transform: translateY(0); opacity: 1; pointer-events: auto; }

.search-container {
    max-width: 600px; margin: 0 auto; display: flex; align-items: center; gap: 12px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
    padding: 12px 16px;
}
.search-container svg { color: var(--text-light); flex-shrink: 0; }
.search-container input {
    flex: 1; border: none; outline: none; font-size: 15px;
    font-family: inherit; background: transparent; color: var(--text);
}
.search-container kbd {
    font-size: 11px; padding: 2px 6px; border-radius: 4px;
    background: var(--bg); border: 1px solid var(--border); color: var(--text-light);
    font-family: inherit;
}

/* ===== Hero ===== */
.hero {
    position: relative; min-height: 100vh; display: flex; align-items: center;
    padding-top: 64px; overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; }
.hero-gradient {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99,102,241,.15), transparent),
                radial-gradient(ellipse 60% 40% at 80% 50%, rgba(244,63,94,.08), transparent);
}
.hero-grid {
    position: absolute; inset: 0;
    background-size: 60px 60px;
    background-image: linear-gradient(to right, rgba(99,102,241,.04) 1px, transparent 1px),
                      linear-gradient(to bottom, rgba(99,102,241,.04) 1px, transparent 1px);
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
    position: relative; max-width: 720px; margin: 0 auto; text-align: center;
    padding: 80px 24px;
}

.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; border-radius: 100px;
    background: rgba(99,102,241,.08); border: 1px solid rgba(99,102,241,.15);
    font-size: 13px; font-weight: 500; color: var(--primary);
    margin-bottom: 32px;
}
.badge-dot {
    width: 6px; height: 6px; border-radius: 50%; background: var(--primary);
    animation: pulse 2s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }

.hero-title {
    font-size: clamp(36px, 5vw, 64px); font-weight: 800; line-height: 1.1;
    letter-spacing: -0.02em; margin-bottom: 24px;
}
.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 18px; line-height: 1.7; color: var(--text-secondary);
    max-width: 560px; margin: 0 auto 40px;
}

.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 64px; }

.hero-stats {
    display: flex; align-items: center; justify-content: center; gap: 32px;
    padding: 24px 40px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--border);
    box-shadow: var(--shadow); width: fit-content; margin: 0 auto;
}
.stat { text-align: center; }
.stat-num { display: block; font-size: 28px; font-weight: 800; color: var(--text); }
.stat-label { font-size: 13px; color: var(--text-secondary); }
.stat-divider { width: 1px; height: 40px; background: var(--border); }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px; border-radius: 10px; font-size: 14px; font-weight: 600;
    transition: var(--transition); white-space: nowrap;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white; box-shadow: 0 4px 14px rgba(99,102,241,.35);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(99,102,241,.4); }
.btn-secondary {
    background: var(--bg-card); color: var(--text); border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn-outline {
    background: transparent; color: var(--text); border: 1px solid var(--border);
    padding: 10px 24px;
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-outline-light {
    background: transparent; color: var(--text-on-dark); border: 1px solid var(--border-dark);
    padding: 10px 24px;
}
.btn-outline-light:hover { border-color: var(--primary-light); color: var(--primary-light); }
.btn-sm { padding: 8px 16px; font-size: 13px; border-radius: 8px; background: var(--primary); color: white; }
.btn-sm:hover { background: var(--primary-dark); }

/* ===== 通用 Section ===== */
.section { padding: 100px 0; }
.section-dark { background: var(--bg-dark); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header-light .section-label { color: var(--primary-light); }
.section-header-light .section-title { color: var(--text-on-dark); }
.section-header-light .section-desc { color: var(--text-on-dark-secondary); }

.section-label {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 14px; font-weight: 600; color: var(--primary);
    margin-bottom: 12px; text-transform: uppercase; letter-spacing: .05em;
}
.section-title {
    font-size: clamp(28px, 3.5vw, 40px); font-weight: 800; letter-spacing: -0.02em;
    margin-bottom: 12px;
}
.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 480px; margin: 0 auto; }

.section-more { text-align: center; margin-top: 48px; }

/* ===== 文章模块 ===== */
.tabs {
    display: flex; gap: 8px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap;
}
.tab {
    padding: 8px 20px; border-radius: 100px; font-size: 14px; font-weight: 500;
    color: var(--text-secondary); background: var(--bg-card); border: 1px solid var(--border);
    transition: var(--transition); display: inline-flex; align-items: center; gap: 6px;
}
.tab:hover { border-color: var(--primary); color: var(--primary); }
.tab.active { background: var(--primary); color: white; border-color: var(--primary); }

.tab-icon {
    width: 20px; height: 20px; border-radius: 4px; display: inline-flex;
    align-items: center; justify-content: center; font-size: 11px; font-weight: 700; color: white;
}
.feishu-icon { background: #3370ff; }
.coze-icon { background: #7c3aed; }

/* 置顶文章 */
.featured-article {
    display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-xl); overflow: hidden; margin-bottom: 32px;
    transition: var(--transition);
}
.featured-article:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }

.featured-img { position: relative; min-height: 320px; overflow: hidden; }
.featured-img img {
    width: 100%; height: 100%; object-fit: cover;
}
.featured-img-placeholder {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
    font-size: 48px; font-weight: 800; color: rgba(255,255,255,.3);
}
.article-tag {
    position: absolute; top: 16px; left: 16px; padding: 4px 12px;
    border-radius: 6px; font-size: 12px; font-weight: 600; color: white;
}
.tag-feishu { background: #3370ff; }
.tag-coze { background: #7c3aed; }
.tag-ai { background: #f43f5e; }
.tag-tutorial { background: #30cfd0; }

.featured-body { padding: 32px 32px 32px 0; display: flex; flex-direction: column; justify-content: center; }
.article-meta { display: flex; gap: 16px; font-size: 13px; color: var(--text-light); margin-bottom: 12px; }
.featured-title { font-size: 24px; font-weight: 700; line-height: 1.3; margin-bottom: 12px; }
.featured-desc { font-size: 15px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 24px; }

.article-footer { display: flex; align-items: center; justify-content: space-between; }
.author-info { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); }
.author-avatar {
    width: 28px; height: 28px; border-radius: 50%; background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; color: white;
}
.read-more {
    display: inline-flex; align-items: center; gap: 4px;
    font-size: 14px; font-weight: 600; color: var(--primary); transition: var(--transition);
}
.read-more:hover { gap: 8px; }

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

.article-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition);
}
.article-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }

.card-img { position: relative; height: 180px; overflow: hidden; }
.card-img img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform .4s ease;
}
.article-card:hover .card-img img { transform: scale(1.05); }
.card-img-placeholder {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
    font-size: 32px; font-weight: 800; color: rgba(255,255,255,.3);
}

.card-body { padding: 20px; }
.card-title { font-size: 16px; font-weight: 700; line-height: 1.4; margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ===== 视频课程 ===== */
.course-filters {
    display: flex; gap: 8px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap;
}
.filter-btn {
    padding: 8px 20px; border-radius: 100px; font-size: 14px; font-weight: 500;
    color: var(--text-on-dark-secondary); border: 1px solid var(--border-dark);
    transition: var(--transition);
}
.filter-btn:hover { border-color: var(--primary-light); color: var(--primary-light); }
.filter-btn.active { background: var(--primary); color: white; border-color: var(--primary); }

.course-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}

.course-card {
    background: var(--bg-card-dark); border: 1px solid var(--border-dark);
    border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition);
}
.course-card:hover { transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,.3); }

.course-thumb { position: relative; aspect-ratio: 16/10; }
.course-thumb img { width: 100%; height: 100%; object-fit: cover; }
.course-thumb-placeholder {
    width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
}
.course-badge {
    position: absolute; top: 12px; right: 12px; padding: 4px 10px;
    border-radius: 6px; font-size: 11px; font-weight: 700; color: white; background: #10b981;
}
.course-badge.hot { background: #f43f5e; }
.course-badge.new { background: #6366f1; }
.course-duration {
    position: absolute; bottom: 12px; right: 12px; padding: 4px 10px;
    border-radius: 6px; font-size: 12px; font-weight: 500; color: white;
    background: rgba(0,0,0,.6); backdrop-filter: blur(4px);
    display: flex; align-items: center; gap: 4px;
}

.course-body { padding: 20px; }
.course-tags { display: flex; gap: 6px; margin-bottom: 10px; flex-wrap: wrap; }
.course-tag {
    padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 600;
    background: rgba(99,102,241,.15); color: var(--primary-light);
}
.course-tag.tag-beginner { background: rgba(16,185,129,.15); color: #34d399; }
.course-tag.tag-advanced { background: rgba(244,63,94,.15); color: #fb7185; }
.course-tag.tag-project { background: rgba(251,191,36,.15); color: #fbbf24; }

.course-title { font-size: 15px; font-weight: 700; color: var(--text-on-dark); line-height: 1.4; margin-bottom: 8px; }
.course-desc { font-size: 13px; color: var(--text-on-dark-secondary); line-height: 1.5; margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.course-meta { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--text-on-dark-secondary); }
.course-students { display: flex; align-items: center; gap: 4px; }
.course-rating { display: flex; align-items: center; gap: 4px; }

/* ===== 工作流中心 ===== */
.workflow-categories {
    display: flex; gap: 12px; justify-content: center; margin-bottom: 40px; flex-wrap: wrap;
}
.wf-category {
    padding: 10px 20px; border-radius: 100px; font-size: 14px; font-weight: 500;
    color: var(--text-secondary); background: var(--bg-card); border: 1px solid var(--border);
    transition: var(--transition); display: inline-flex; align-items: center; gap: 6px; cursor: pointer;
}
.wf-category:hover { border-color: var(--primary); color: var(--primary); }
.wf-category.active { background: var(--primary); color: white; border-color: var(--primary); }
.wf-cat-icon { font-size: 16px; }

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

.workflow-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 24px; transition: var(--transition);
}
.workflow-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }

.wf-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 16px; }
.wf-icon {
    width: 48px; height: 48px; border-radius: 12px; display: flex;
    align-items: center; justify-content: center;
}
.wf-actions { display: flex; align-items: center; gap: 12px; }
.wf-use-count { font-size: 12px; color: var(--text-light); }
.wf-fav { font-size: 18px; color: var(--text-light); transition: var(--transition); }
.wf-fav:hover, .wf-fav.active { color: var(--secondary); }

.wf-title { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.wf-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; margin-bottom: 16px; }

.wf-flow {
    display: flex; align-items: center; gap: 6px; margin-bottom: 16px;
    flex-wrap: wrap;
}
.wf-node {
    padding: 4px 10px; border-radius: 6px; font-size: 12px; font-weight: 500;
    background: rgba(99,102,241,.08); color: var(--primary); border: 1px solid rgba(99,102,241,.15);
}
.wf-arrow { color: var(--text-light); font-size: 12px; }

.wf-tags { display: flex; gap: 6px; margin-bottom: 16px; flex-wrap: wrap; }
.wf-tag {
    padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 500;
    background: var(--bg); color: var(--text-secondary); border: 1px solid var(--border);
}

.wf-footer { display: flex; justify-content: space-between; align-items: center; }
.wf-platform {
    padding: 4px 10px; border-radius: 6px; font-size: 12px; font-weight: 600;
}
.coze-platform { background: rgba(124,58,237,.1); color: #7c3aed; }
.feishu-platform { background: rgba(51,112,255,.1); color: #3370ff; }

/* ===== 关于涛哥 ===== */
.section-about {
    background: linear-gradient(180deg, var(--bg) 0%, rgba(99,102,241,.03) 100%);
}
.about-layout {
    display: grid; grid-template-columns: 400px 1fr; gap: 80px; align-items: center;
}

.about-visual { position: relative; display: flex; justify-content: center; }

.about-avatar-wrapper { position: relative; }
.about-avatar {
    width: 200px; height: 200px; border-radius: 50%; overflow: hidden;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex; align-items: center; justify-content: center;
    position: relative; z-index: 2;
}
.avatar-placeholder { font-size: 72px; font-weight: 800; color: rgba(255,255,255,.9); }
.avatar-ring {
    position: absolute; inset: -12px; border-radius: 50%;
    border: 2px dashed rgba(99,102,241,.2); animation: spin 30s linear infinite;
}
.ring-2 { inset: -28px; border-color: rgba(244,63,94,.1); animation-direction: reverse; animation-duration: 40s; }
@keyframes spin { to { transform: rotate(360deg); } }

.about-float-cards { position: absolute; inset: -40px; }
.float-card {
    position: absolute; padding: 10px 16px; border-radius: 12px;
    background: var(--bg-card); border: 1px solid var(--border);
    box-shadow: var(--shadow); font-size: 13px; font-weight: 600;
    display: flex; align-items: center; gap: 6px;
    animation: float 3s ease-in-out infinite;
}
.fc-icon { font-size: 18px; }
.fc-1 { top: 10%; right: -20px; animation-delay: 0s; }
.fc-2 { top: 50%; right: -40px; animation-delay: .8s; }
.fc-3 { bottom: 10%; right: -20px; animation-delay: 1.6s; }
.fc-4 { top: 30%; left: -40px; animation-delay: 2.4s; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

.about-content {}
.about-title { font-size: 36px; font-weight: 800; margin-bottom: 20px; }
.about-bio { margin-bottom: 24px; }
.about-bio p { font-size: 15px; color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px; }

.about-skills { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.skill-tag {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 14px; border-radius: 100px; font-size: 13px; font-weight: 500;
    background: var(--bg-card); border: 1px solid var(--border);
}
.skill-dot { width: 8px; height: 8px; border-radius: 50%; }

.about-social { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 32px; }
.social-link {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px; border-radius: 10px; font-size: 13px; font-weight: 500;
    background: var(--bg-card); border: 1px solid var(--border); color: var(--text-secondary);
    transition: var(--transition);
}
.social-link:hover { border-color: var(--primary); color: var(--primary); }

.about-cta { display: flex; gap: 12px; }

/* ===== 文章详情页 ===== */
.article-page {
    padding-top: 100px;
    padding-bottom: 80px;
}
.article-page-header {
    max-width: 780px;
    margin: 0 auto;
    padding: 0 24px;
    margin-bottom: 48px;
}
.article-page-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: white;
    margin-bottom: 16px;
}
.article-page-title {
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}
.article-page-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}
.article-page-meta .author-info {
    font-weight: 600;
    color: var(--text);
}
.article-page-cover {
    max-width: 900px;
    margin: 0 auto 48px;
    padding: 0 24px;
}
.article-page-cover img {
    width: 100%;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}
.article-page-content {
    max-width: 780px;
    margin: 0 auto;
    padding: 0 24px;
    font-size: 16px;
    line-height: 1.8;
    color: var(--text);
}
.article-page-content h1,
.article-page-content h2,
.article-page-content h3 {
    margin-top: 2em;
    margin-bottom: 0.8em;
    font-weight: 700;
    line-height: 1.3;
}
.article-page-content h2 { font-size: 1.5em; }
.article-page-content h3 { font-size: 1.25em; }
.article-page-content p {
    margin-bottom: 1.2em;
}
.article-page-content pre {
    background: var(--bg-dark);
    color: var(--text-on-dark);
    padding: 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1.5em 0;
    font-size: 14px;
    line-height: 1.6;
}
.article-page-content code {
    background: rgba(99,102,241,.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}
.article-page-content pre code {
    background: none;
    padding: 0;
}
.article-page-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 12px 20px;
    margin: 1.5em 0;
    background: rgba(99,102,241,.04);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-secondary);
}
.article-page-content ul, .article-page-content ol {
    margin: 1em 0;
    padding-left: 2em;
}
.article-page-content li { margin-bottom: 0.5em; }
.article-page-content img {
    border-radius: var(--radius);
    margin: 1.5em auto;
}
.article-page-content a {
    color: var(--primary);
    border-bottom: 1px solid rgba(99,102,241,.3);
}
.article-page-content a:hover {
    border-bottom-color: var(--primary);
}

.article-page-nav {
    max-width: 780px;
    margin: 64px auto 0;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    gap: 24px;
}
.article-nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    background: var(--bg-card);
}
.article-nav-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ===== 页脚 ===== */
.footer {
    background: var(--bg-dark); padding: 64px 0 32px; color: var(--text-on-dark);
}
.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px;
    margin-bottom: 48px;
}
.footer-brand .logo-text { color: var(--text-on-dark); -webkit-text-fill-color: var(--text-on-dark); }
.footer-desc { font-size: 14px; color: var(--text-on-dark-secondary); margin-top: 12px; line-height: 1.7; }
.footer-links h4 { font-size: 14px; font-weight: 600; margin-bottom: 16px; }
.footer-links a { display: block; font-size: 14px; color: var(--text-on-dark-secondary); margin-bottom: 10px; transition: var(--transition); }
.footer-links a:hover { color: var(--primary-light); }
.footer-bottom {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: 24px; border-top: 1px solid var(--border-dark);
    font-size: 13px; color: var(--text-on-dark-secondary);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .course-grid { grid-template-columns: repeat(2, 1fr); }
    .about-layout { grid-template-columns: 1fr; text-align: center; }
    .about-visual { margin-bottom: 40px; }
    .about-skills, .about-social { justify-content: center; }
    .about-cta { justify-content: center; }
    .float-card.fc-4 { left: auto; right: -40px; top: 70%; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: flex; }
    .featured-article { grid-template-columns: 1fr; }
    .featured-body { padding: 24px; }
    .article-grid { grid-template-columns: 1fr; }
    .course-grid { grid-template-columns: 1fr; }
    .workflow-grid { grid-template-columns: 1fr; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .stat-divider { width: 40px; height: 1px; }
    .hero-actions { flex-direction: column; align-items: center; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
    .article-page-nav { flex-direction: column; }
}