/* ==================== 全局重置 ==================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --primary: #4F46E5;
    --primary-light: #818CF8;
    --primary-dark: #3730A3;
    --secondary: #10B981;
    --accent: #F59E0B;
    --bg: #F1F5F9;
    --card: #FFFFFF;
    --text: #1E293B;
    --text-muted: #64748B;
    --border: #E2E8F0;
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-lg: 0 10px 25px rgba(0,0,0,.08);
    --transition: 0.25s ease;
}
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    background: var(--bg); color: var(--text); line-height: 1.7; min-height: 100vh;
    display: flex; flex-direction: column;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; border-radius: 8px; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.main-content { flex: 1; padding-top: 20px; padding-bottom: 40px; }

/* ==================== 导航 ==================== */
.navbar {
    background: var(--card); border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,.04);
}
.nav-container { display: flex; align-items: center; height: 60px; gap: 12px; }
.nav-logo {
    display: flex; align-items: center; gap: 8px;
    font-weight: 800; flex-shrink: 0; margin-right: 8px;
}
.nav-logo img { display: block; }
.nav-links {
    display: flex; align-items: center; gap: 2px; flex: 1;
}
.nav-link {
    padding: 6px 12px; border-radius: 6px; font-size: .88rem;
    color: var(--text); transition: all var(--transition); font-weight: 500;
    white-space: nowrap;
}
.nav-link:hover { background: #EEF2FF; color: var(--primary); }
.nav-link.active { background: #EEF2FF; color: var(--primary); font-weight: 600; }

.nav-actions {
    display: flex; align-items: center; gap: 6px; flex-shrink: 0;
}
.nav-actions .btn { padding: 6px 14px; font-size: .82rem; white-space: nowrap; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 18px; border-radius: 8px; font-size: .88rem;
    font-weight: 600; border: none; cursor: pointer;
    transition: all var(--transition); text-decoration: none !important;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { background: #EEF2FF; border-color: var(--primary-light); color: var(--primary); }
.btn-block { width: 100%; justify-content: center; padding: 12px; }
.btn-sm { padding: 5px 12px; font-size: .82rem; }

.nav-user {
    display: flex; align-items: center; gap: 4px;
    padding-left: 8px; border-left: 1px solid var(--border);
}
.user-badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 10px; border-radius: 6px; font-size: .82rem; font-weight: 500;
}
.user-badge.role-admin { background: #FEE2E2; color: #991B1B; }
.user-badge.role-editor { background: #FEF3C7; color: #92400E; }
.user-badge.role-author { background: #DBEAFE; color: #1E40AF; }
.user-badge.role-user { background: #F1F5F9; color: #475569; }
.logout-link { padding: 6px 8px !important; color: var(--text-muted) !important; }
.logout-link:hover { color: #EF4444 !important; }

.menu-toggle {
    display: none; background: none; border: 1px solid var(--border);
    border-radius: 6px; padding: 8px 10px; cursor: pointer; font-size: 1.1rem; color: var(--text);
}
.logout-link:hover { color: #EF4444 !important; }

.menu-toggle {
    display: none; background: none; border: 1px solid var(--border);
    border-radius: 6px; padding: 8px 10px; cursor: pointer; font-size: 1.1rem; color: var(--text);
}

/* ==================== 轮播 ==================== */
.carousel-container {
    position: relative; overflow: hidden; border-radius: var(--radius);
    margin-bottom: 2rem; box-shadow: var(--shadow-lg);
}
.carousel-slides { display: flex; transition: transform 0.5s ease; }
.carousel-slide {
    min-width: 100%; position: relative; height: 400px;
    background-size: cover; background-position: center;
    display: flex; align-items: center;
}
.carousel-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(0,0,0,.65), rgba(0,0,0,.25));
}
.carousel-content {
    position: relative; z-index: 1; padding: 3rem; max-width: 700px; color: #fff;
}
.carousel-content h2 { font-size: 2.2rem; margin-bottom: 1rem; font-weight: 800; line-height: 1.3; }
.carousel-content p { font-size: 1.1rem; opacity: .9; line-height: 1.6; }
.carousel-dots {
    position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 10px; z-index: 2;
}
.carousel-dot {
    width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.5);
    cursor: pointer; transition: all var(--transition); border: none;
}
.carousel-dot.active { background: #fff; width: 30px; border-radius: 5px; }
.carousel-btn {
    position: absolute; top: 50%; transform: translateY(-50%); z-index: 2;
    background: rgba(255,255,255,.2); border: none; width: 48px; height: 48px;
    border-radius: 50%; cursor: pointer; font-size: 1.3rem; color: #fff;
    backdrop-filter: blur(4px); transition: all var(--transition);
    display: flex; align-items: center; justify-content: center;
}
.carousel-btn:hover { background: rgba(255,255,255,.4); }
.carousel-prev { left: 16px; }
.carousel-next { right: 16px; }

/* ==================== 文章卡片 ==================== */
.post-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px;
}
.post-card {
    background: var(--card); border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow); transition: all var(--transition);
    display: flex; flex-direction: column;
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.post-card-image {
    height: 200px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); background-size: cover; background-position: center; position: relative;
}
.post-card-featured {
    position: absolute; top: 12px; left: 12px; background: var(--accent); color: #fff;
    padding: 3px 10px; border-radius: 6px; font-size: .75rem; font-weight: 700;
}
.post-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.post-card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 10px; }
.post-card-tag {
    display: inline-block; padding: 2px 10px; border-radius: 12px;
    font-size: .75rem; font-weight: 600; color: #fff;
}
.post-card-title {
    font-size: 1.15rem; font-weight: 700; line-height: 1.4; margin-bottom: 8px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.post-card-title a { color: var(--text) !important; }
.post-card-title a:hover { color: var(--primary) !important; }
.post-card-summary {
    color: var(--text-muted); font-size: .9rem; line-height: 1.6;
    flex: 1; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
    margin-bottom: 14px;
}
.post-card-meta {
    display: flex; align-items: center; gap: 16px; font-size: .8rem; color: var(--text-muted);
    padding-top: 14px; border-top: 1px solid var(--border);
}
.post-card-meta i { width: 14px; }

/* ==================== 页面标题 ==================== */
.page-header {
    text-align: center; padding: 2rem 0 1.5rem;
}
.page-header h1 { font-size: 2rem; font-weight: 800; color: var(--text); }
.page-header p { color: var(--text-muted); margin-top: 6px; }
.section-title {
    font-size: 1.4rem; font-weight: 700; margin-bottom: 1.2rem;
    display: flex; align-items: center; gap: 10px;
}
.section-title i { color: var(--primary); }

/* ==================== 表单 ==================== */
.form-card {
    max-width: 480px; margin: 2rem auto; background: var(--card);
    border-radius: var(--radius); padding: 2.5rem; box-shadow: var(--shadow-lg);
}
.form-card h2 { text-align: center; font-size: 1.5rem; margin-bottom: 1.5rem; }
.form-group { margin-bottom: 1.2rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: .9rem; }
.form-control {
    width: 100%; padding: 10px 14px; border: 2px solid var(--border); border-radius: 10px;
    font-size: .95rem; transition: border-color var(--transition); background: #FAFBFC;
    font-family: inherit;
}
.form-control:focus { outline: none; border-color: var(--primary); background: #fff; }
.form-control-lg { padding: 14px; font-size: 1rem; }
textarea.form-control { resize: vertical; min-height: 100px; }
select.form-control { cursor: pointer; }
.btn {
    display: inline-flex; align-items: center; gap: 8px; padding: 10px 24px;
    border: none; border-radius: 10px; font-size: .95rem; font-weight: 600;
    cursor: pointer; transition: all var(--transition); font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-success { background: var(--secondary); color: #fff; }
.btn-success:hover { background: #059669; }
.btn-danger { background: #EF4444; color: #fff; }
.btn-danger:hover { background: #DC2626; }
.btn-sm { padding: 6px 14px; font-size: .85rem; }
.btn-block { width: 100%; justify-content: center; padding: 12px; }
.form-footer { text-align: center; margin-top: 1.2rem; font-size: .9rem; color: var(--text-muted); }

/* ==================== Flash ==================== */
.flash-message {
    position: fixed; top: 72px; right: 20px; z-index: 9999;
    padding: 10px 18px; border-radius: 10px;
    display: flex; align-items: center; gap: 8px; font-size: .88rem; font-weight: 500;
    box-shadow: 0 4px 16px rgba(0,0,0,.12);
    transition: opacity .5s; max-width: 360px;
    animation: flashIn .3s ease;
}
@keyframes flashIn {
    from { transform: translateX(100px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
.flash-success { background: #D1FAE5; color: #065F46; border: 1px solid #A7F3D0; }
.flash-error { background: #FEE2E2; color: #991B1B; border: 1px solid #FECACA; }

/* ==================== Tags ==================== */
.tag-chip {
    display: inline-flex; align-items: center; gap: 6px; padding: 6px 16px;
    border-radius: 20px; font-size: .85rem; font-weight: 600; color: #fff;
    transition: all var(--transition);
}
.tag-chip:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.15); }

/* ==================== 文章详情 ==================== */
.post-detail {
    background: var(--card); border-radius: var(--radius); padding: 2.5rem 3rem;
    box-shadow: var(--shadow); max-width: 1100px; margin: 1rem auto;
}

/* Breadcrumb */
.post-breadcrumb {
    font-size: .85rem; color: var(--text-muted); margin-bottom: 1.2rem;
    display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.post-breadcrumb a { color: var(--primary); }
.post-breadcrumb .sep { color: #CBD5E1; }
.post-breadcrumb .current { color: var(--text-muted); }

.post-detail-cover {
    width: 100%; max-height: 420px; object-fit: cover; border-radius: 12px;
    margin-bottom: 1.5rem; box-shadow: var(--shadow);
}
.post-cover-wrap { margin-bottom: 0; }

.post-detail-title {
    font-size: 2.2rem; font-weight: 800; line-height: 1.35;
    margin-bottom: .8rem; color: #0F172A;
}
.post-detail-meta {
    display: flex; flex-wrap: wrap; gap: 1.5rem; color: var(--text-muted);
    font-size: .9rem; padding-bottom: 1.2rem;
    border-bottom: 2px solid #F1F5F9; margin-bottom: 1.2rem;
}
.post-detail-meta .meta-item i { margin-right: 6px; width: 14px; text-align: center; }

.post-detail-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 1.5rem; }

/* ─── Content Typography ─── */
.post-detail-content {
    font-size: 1.1rem; line-height: 1.9; color: #1E293B;
}
.post-detail-content h2 {
    font-size: 1.65rem; font-weight: 700; margin: 2rem 0 1rem;
    padding-bottom: .5rem; border-bottom: 2px solid #F1F5F9;
}
.post-detail-content h3 {
    font-size: 1.3rem; font-weight: 700; margin: 1.5rem 0 .8rem; color: #0F172A;
}
.post-detail-content h4 {
    font-size: 1.1rem; font-weight: 600; margin: 1.2rem 0 .6rem;
}
.post-detail-content p { margin-bottom: 1.2rem; }
.post-detail-content a {
    color: var(--primary); text-decoration: underline;
    text-underline-offset: 2px;
}
.post-detail-content a:hover { color: var(--primary-dark); }
.post-detail-content ul, .post-detail-content ol {
    margin: 0 0 1.2rem 1.8rem; padding: 0;
}
.post-detail-content li { margin-bottom: .5rem; }
.post-detail-content li > p { margin-bottom: .3rem; }
.post-detail-content img {
    max-width: 100%; max-height: 500px; width: auto; height: auto;
    border-radius: 8px; margin: 1rem auto; display: block;
    box-shadow: 0 2px 8px rgba(0,0,0,.08);
    cursor: zoom-in; transition: all .3s ease;
}
.post-detail-content img:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.post-detail-content blockquote {
    border-left: 4px solid var(--primary); padding: 1rem 1.5rem; margin: 1.5rem 0;
    background: #F8FAFC; border-radius: 0 8px 8px 0;
    color: #475569; font-style: italic;
}
.post-detail-content blockquote p:last-child { margin-bottom: 0; }
.post-detail-content code {
    background: #F1F5F9; padding: 2px 8px; border-radius: 4px;
    font-size: .9em; font-family: 'JetBrains Mono', 'Fira Code', monospace;
}
.post-detail-content pre {
    background: #1E293B; color: #E2E8F0; padding: 1.2rem 1.5rem;
    border-radius: 8px; overflow-x: auto; margin: 1.2rem 0;
    font-size: .9rem; line-height: 1.6;
}
.post-detail-content pre code {
    background: none; padding: 0; color: inherit; font-size: inherit;
}
.post-detail-content table {
    width: 100%; border-collapse: collapse; margin: 1.2rem 0;
    font-size: .95rem;
}
.post-detail-content th, .post-detail-content td {
    padding: 10px 14px; border: 1px solid #E2E8F0; text-align: left;
}
.post-detail-content th {
    background: #F8FAFC; font-weight: 700; color: #475569;
}
.post-detail-content hr {
    border: none; border-top: 2px solid #F1F5F9; margin: 2rem 0;
}
.post-detail-content .ol {
    list-style-type: decimal;
}

/* Footer section */
.post-detail-footer {
    margin-top: 2rem; padding-top: 1.5rem;
    border-top: 2px solid #F1F5F9; display: flex;
    align-items: center; gap: 12px; flex-wrap: wrap;
}
.post-footer-tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; color: var(--text-muted); font-size: .9rem; }
.tag-chip-sm {
    display: inline-flex; align-items: center; padding: 4px 12px;
    border-radius: 14px; font-size: .8rem; font-weight: 500;
}

/* Navigation between posts */
.post-nav {
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
    margin-top: 2rem; padding-top: 1.5rem; border-top: 2px solid #F1F5F9;
}
.post-nav-link {
    display: flex; flex-direction: column; gap: 4px;
    padding: 1rem 1.2rem; border-radius: 10px;
    background: #F8FAFC; transition: all var(--transition);
    border: 1px solid var(--border);
}
.post-nav-link:hover { background: #EEF2FF; border-color: var(--primary-light); transform: translateY(-2px); }
.post-nav-prev { align-items: flex-start; }
.post-nav-next { align-items: flex-end; }
.post-nav-label { font-size: .8rem; color: var(--text-muted); font-weight: 500; }
.post-nav-title { font-size: .9rem; font-weight: 600; color: var(--text); line-height: 1.3; }
.post-nav-link:hover .post-nav-title { color: var(--primary); }

@media (max-width: 768px) {
    .post-detail { padding: 1.5rem; }
    .post-detail-title { font-size: 1.6rem; }
    .post-detail-content { font-size: 1rem; }
    .post-nav { grid-template-columns: 1fr; }
}

/* ==================== Admin ==================== */
.admin-layout { display: flex; gap: 24px; }
.admin-sidebar {
    width: 240px; flex-shrink: 0; background: var(--card); border-radius: var(--radius);
    padding: 1.2rem; box-shadow: var(--shadow); height: fit-content;
}
.admin-sidebar h4 { font-size: .85rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 1rem; padding-left: 8px; }
.admin-sidebar a {
    display: flex; align-items: center; gap: 10px; padding: 10px 12px;
    border-radius: 8px; color: var(--text); font-weight: 500; margin-bottom: 4px;
}
.admin-sidebar a:hover, .admin-sidebar a.active { background: #EEF2FF; color: var(--primary); }
.admin-main { flex: 1; min-width: 0; }
.admin-card {
    background: var(--card); border-radius: var(--radius); padding: 1.5rem;
    box-shadow: var(--shadow); margin-bottom: 1.2rem;
}
.stats-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px;
}
.stat-card {
    background: var(--card); border-radius: var(--radius); padding: 1.5rem;
    box-shadow: var(--shadow); text-align: center;
}
.stat-card i { font-size: 2rem; margin-bottom: 8px; display: block; }
.stat-card h3 { font-size: 1.8rem; font-weight: 800; }
.stat-card p { color: var(--text-muted); font-size: .85rem; }

/* ==================== 表格 ==================== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: .9rem; }
th { font-weight: 700; color: var(--text-muted); font-size: .8rem; text-transform: uppercase; letter-spacing: 1px; background: #F8FAFC; }
tr:hover td { background: #F8FAFC; }
.table-actions { display: flex; gap: 6px; }
.badge {
    display: inline-block; padding: 2px 10px; border-radius: 12px; font-size: .75rem; font-weight: 600;
}
.badge-green { background: #D1FAE5; color: #065F46; }
.badge-yellow { background: #FEF3C7; color: #92400E; }
.badge-red { background: #FEE2E2; color: #991B1B; }
.badge-blue { background: #DBEAFE; color: #1E40AF; }

/* ==================== Footer ==================== */
.footer {
    background: var(--card); border-top: 1px solid var(--border); padding: 2rem 0 0; margin-top: auto;
}
.footer-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; margin-bottom: 1.5rem; }
.footer-col h4 { font-weight: 700; margin-bottom: .8rem; font-size: 1rem; }
.footer-col p, .footer-col a { color: var(--text-muted); font-size: .9rem; display: block; margin-bottom: 6px; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding: 1rem 0; text-align: center; font-size: .85rem; color: var(--text-muted); }

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .nav-links {
        display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0;
        background: var(--card); border-bottom: 1px solid var(--border); padding: 8px 16px;
        box-shadow: var(--shadow-lg); gap: 2px;
    }
    .nav-links.active { display: flex; }
    .nav-actions {
        display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0;
        background: var(--card); padding: 8px 16px 16px; gap: 6px;
        border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg);
    }
    .nav-actions.active { display: flex; }
    /* Show nav-actions below nav-links when active */
    .nav-links.active + .nav-actions,
    .nav-links.active ~ .nav-actions { display: flex; top: auto; position: static; box-shadow: none; border-bottom: none; padding-top: 0; }
    .nav-user { border-left: none; padding-left: 0; }
    .carousel-slide { height: 280px; }
    .carousel-content h2 { font-size: 1.5rem; }
    .carousel-content p { font-size: .95rem; }
    .carousel-content { padding: 1.5rem; }
    .post-grid { grid-template-columns: 1fr; }
    .admin-layout { flex-direction: column; }
    .admin-sidebar { width: 100%; }
    .post-detail { padding: 1.5rem; }
    .post-detail-title { font-size: 1.5rem; }
    .post-detail-cover { height: 220px; }
}