/* ===== CSS Variables & Theme ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fb;
    --bg-card: #ffffff;
    --bg-nav: rgba(255, 255, 255, 0.85);
    --text-primary: #1a1a2e;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-light: #eef2ff;
    --accent-rgb: 99,102,241;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --info: #3b82f6;
    --info-bg: #eff6ff;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04),0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06),0 1px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-lg: 16px;
    --radius-md: 10px;
    --nav-height: 64px;
    --max-width: 1200px;
    --transition: 0.2s ease;
    --transition-slow: 0.35s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --bg-nav: rgba(15,23,42,0.92);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #334155;
    --accent: #818cf8;
    --accent-hover: #6366f1;
    --accent-light: #1e1b4b;
    --accent-rgb: 129,140,248;
    --success: #34d399;
    --success-bg: #064e3b;
    --warning: #fbbf24;
    --warning-bg: #78350f;
    --danger: #f87171;
    --danger-bg: #7f1d1d;
    --info: #60a5fa;
    --info-bg: #1e3a5f;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.35);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.45);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background var(--transition), color var(--transition);
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; }

/* ===== Navbar ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-nav);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    height: var(--nav-height);
    display: flex;
    align-items: center;
    transition: background var(--transition), border var(--transition);
}

.nav-inner {
    max-width: var(--max-width);
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    flex-shrink: 0;
}
.logo:hover { color: var(--accent); }
.logo-icon { font-size: 1.5rem; }

.nav-links {
    display: flex;
    gap: 8px;
    flex: 1;
}

.nav-dropdown {
    position: relative;
}
.nav-dropdown-btn {
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
}
.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    min-width: 160px;
    z-index: 200;
    padding: 6px 0;
    margin-top: 4px;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
    display: block;
    padding: 8px 16px;
    font-size: 0.85rem;
    color: var(--text-primary);
    transition: background var(--transition);
}
.nav-dropdown-menu a:hover {
    background: var(--accent-light);
    color: var(--accent);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.search-box form {
    display: flex;
    align-items: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 4px 4px 4px 14px;
    transition: border var(--transition);
}
.search-box input {
    border: none;
    background: transparent;
    outline: none;
    color: var(--text-primary);
    font-size: 0.875rem;
    width: 140px;
    padding: 4px 0;
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box button {
    border: none;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

.theme-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
}
.theme-btn:hover { background: var(--bg-secondary); color: var(--accent); }
[data-theme="light"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: none; }

.user-menu { display: flex; align-items: center; gap: 12px; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    line-height: 1.4;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }
.btn-lg { padding: 12px 28px; font-size: 1rem; border-radius: var(--radius); }
.btn-sm { padding: 5px 12px; font-size: 0.8rem; border-radius: 6px; }
.btn-block { display: flex; width: 100%; }

/* ===== Avatars ===== */
.avatar-sm { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.avatar-md { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; }
.avatar-lg { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; }
.avatar-default {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.85rem;
}
.avatar-lg.avatar-default { font-size: 2rem; }
.avatar-md.avatar-default { font-size: 1.1rem; }

/* ===== Badges ===== */
.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--bg-secondary);
    color: var(--text-secondary);
}
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-admin { background: var(--accent-light); color: var(--accent); }

/* ===== Flash Messages ===== */
.flash-container {
    max-width: 800px;
    margin: 16px auto 0;
    padding: 0 16px;
}
.flash {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
    font-size: 0.9rem;
    animation: slideDown 0.3s ease;
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
.flash-success { background: var(--success-bg); color: var(--success); border: 1px solid var(--success); }
.flash-danger { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger); }
.flash-warning { background: var(--warning-bg); color: var(--warning); border: 1px solid var(--warning); }
.flash-info { background: var(--info-bg); color: var(--info); border: 1px solid var(--info); }

/* ===== Container ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 24px; }
.main-content { flex: 1; }

/* ===== Hero ===== */
.hero {
    padding: 20px 24px 20px;
    text-align: center;
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--bg-primary) 50%);
    border-bottom: 1px solid var(--border);
}
.hero-inner { max-width: 700px; margin: 0 auto; }
.hero-title {
    font-size: 2rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}
.hero-subtitle { font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 32px; line-height: 1.7; }
.hero-actions { display: flex; gap: 12px; justify-content: center; }

/* ===== Features ===== */
.features { padding: 60px 0; }
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}
.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}
.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}
.feature-icon { font-size: 2.2rem; margin-bottom: 12px; }
.feature-card h4 { font-size: 1.05rem; margin-bottom: 6px; color: var(--text-primary); }
.feature-card p { font-size: 0.875rem; color: var(--text-secondary); }

/* ===== Board Tabs (index page) ===== */
.board-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--border);
}
.board-tab {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px solid transparent;
    transition: all var(--transition);
}
.board-tab:hover { color: var(--accent); border-color: var(--accent); }
.board-tab.active { background: var(--accent); color: #fff; }
.board-tab-more { border-style: dashed; border-color: var(--border); }
.tab-icon { font-size: 0.9rem; }
.board-tab-ann { border-color: var(--accent); color: var(--accent); font-weight: 600; }

/* ===== Forum Table ===== */
.forum-table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.forum-table {
    display: flex;
    flex-direction: column;
}
.forum-row {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    transition: background var(--transition);
    gap: 16px;
}
.forum-row:last-child { border-bottom: none; }
.forum-row-header {
    background: var(--bg-secondary);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    padding: 12px 20px;
}
.forum-row-link {
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
}
.forum-row-link:hover {
    background: var(--accent-light);
    color: var(--text-primary);
}
.forum-row-announcement {
    border-left: 3px solid var(--accent);
    background: linear-gradient(90deg, var(--accent-light) 0%, var(--bg-card) 5%);
}

.forum-col-main {
    flex: 3;
    display: flex;
    align-items: center;
    gap: 14px;
    min-width: 0;
}
.forum-col-stats {
    flex: 0 0 80px;
    text-align: center;
}
.forum-col-last {
    flex: 1.5;
    min-width: 0;
    text-align: right;
}

.forum-col-topic { flex: 3; min-width: 0; }
.forum-col-author { flex: 0 0 120px; }
.forum-col-replies { flex: 0 0 100px; text-align: center; }
.forum-col-time { flex: 0 0 90px; text-align: right; }

.forum-board-icon {
    font-size: 2rem;
    flex-shrink: 0;
}
.forum-board-info { min-width: 0; }
.forum-board-name {
    font-size: 1.05rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
    color: var(--text-primary);
}
.forum-board-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.forum-board-meta { font-size: 0.8rem; }

.forum-stat-num {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}
.forum-stat {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: block;
    line-height: 1.6;
}

.forum-last-post {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 2px;
}
.forum-last-title {
    font-size: 0.85rem;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 180px;
}
.forum-last-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.forum-topic-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.forum-topic-excerpt {
    font-size: 0.8rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.forum-author {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===== Small Avatars ===== */
.avatar-xs { width: 24px; height: 24px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.avatar-default-xs {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px; height: 24px;
    border-radius: 50%;
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.65rem;
    flex-shrink: 0;
}

/* ===== Announcement ===== */
.badge-announcement {
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    color: #fff;
    font-size: 0.7rem;
    padding: 2px 8px;
}
.badge-sm { font-size: 0.7rem; padding: 1px 6px; }

.moderator-tag {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    background: var(--warning-bg);
    color: var(--warning);
    font-weight: 500;
}
.moderator-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 8px;
    font-size: 0.7rem;
    background: var(--warning-bg);
    color: var(--warning);
    margin: 1px;
}

.board-moderator-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
    flex-wrap: wrap;
}

.announcement-note {
    font-size: 0.82rem;
    color: var(--accent);
    font-weight: 500;
}

.announcement-note-box {
    background: var(--accent-light);
    border: 1px solid var(--accent);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    font-size: 0.9rem;
    color: var(--text-primary);
    line-height: 1.6;
}
.announcement-note-box strong { color: var(--accent); }

.board-announcement {
    border-left: 4px solid var(--accent);
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--bg-card) 20%);
}

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

.forum-board-header {
    flex-wrap: wrap;
}

/* ===== Form Select Small ===== */
.form-select-sm {
    padding: 4px 8px;
    font-size: 0.75rem;
    background-position: right 8px center;
    padding-right: 28px;
}

/* ===== Board Cards Grid ===== */
.boards-grid, .board-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}
.board-card {
    display: flex;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    color: var(--text-primary);
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}
.board-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
    color: var(--text-primary);
}
.board-card-icon { font-size: 2rem; flex-shrink: 0; }
.board-card-body h3 {
    font-size: 1.05rem;
    margin-bottom: 4px;
    color: var(--text-primary);
}
.board-card-body p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.board-card-meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===== Board Header ===== */
.board-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
}
.board-header-info { display: flex; align-items: center; gap: 16px; }
.board-icon-large { font-size: 2.5rem; }
.board-header-info h2 { font-size: 1.4rem; margin-bottom: 4px; }
.board-header-info p { font-size: 0.9rem; color: var(--text-secondary); }

/* ===== Board Breadcrumb ===== */
.board-breadcrumb {
    font-size: 0.85rem;
    color: var(--text-muted);
}
.board-breadcrumb a { color: var(--text-secondary); }
.board-breadcrumb a:hover { color: var(--accent); }

/* ===== Post Board Tag ===== */
.post-board-tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    background: var(--accent-light);
    color: var(--accent);
    font-weight: 500;
}
.post-card-meta-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.posts-grid { display: grid; gap: 16px; }

.post-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}
.post-card:hover { box-shadow: var(--shadow-md); border-color: var(--accent); }

.post-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.post-author { display: flex; align-items: center; gap: 8px; color: var(--text-primary); }
.post-username { font-weight: 600; font-size: 0.9rem; }
.post-time { font-size: 0.8rem; color: var(--text-muted); }

.post-card-title { font-size: 1.15rem; margin-bottom: 8px; font-weight: 700; }
.post-card-title a { color: var(--text-primary); }
.post-card-title a:hover { color: var(--accent); }

.post-card-excerpt {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 14px;
}
.post-card-footer { display: flex; align-items: center; gap: 16px; }
.post-stat { font-size: 0.85rem; color: var(--text-muted); }

/* ===== Empty State ===== */
.empty-state { text-align: center; padding: 60px 20px; }
.empty-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-state h3 { font-size: 1.3rem; margin-bottom: 6px; color: var(--text-primary); }
.empty-state p { color: var(--text-secondary); margin-bottom: 16px; }

/* ===== Auth Pages ===== */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - var(--nav-height) - 100px);
    padding: 40px 16px;
}
.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-md);
}
.auth-header { text-align: center; margin-bottom: 28px; }
.auth-header h2 { font-size: 1.5rem; margin-bottom: 6px; }
.auth-header p { color: var(--text-secondary); font-size: 0.9rem; }
.auth-form .form-group { margin-bottom: 18px; }
.checkbox-label { display: flex; align-items: flex-start; gap: 6px; font-size: 0.85rem; color: var(--text-secondary); cursor: pointer; user-select: none; }
.checkbox-label input[type="checkbox"] { width: 15px; height: 15px; margin-top: 2px; flex-shrink: 0; cursor: pointer; accent-color: var(--primary); }
.checkbox-label a { color: var(--primary); text-decoration: none; }
.checkbox-label a:hover { text-decoration: underline; }
.auth-footer { text-align: center; margin-top: 20px; }
.auth-footer p { font-size: 0.9rem; color: var(--text-secondary); }

/* ===== Forms ===== */
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border var(--transition);
    font-family: inherit;
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group small { display: block; margin-top: 4px; font-size: 0.8rem; color: var(--text-muted); }

.form-actions { display: flex; gap: 12px; margin-top: 24px; }

/* ===== Post Form ===== */
.post-form-page { max-width: 700px; margin: 0 auto; padding: 40px 0; }
.post-form-page h2 { margin-bottom: 24px; font-size: 1.5rem; }

/* ===== Post Detail ===== */
.post-detail { max-width: 768px; margin: 0 auto; padding: 32px 0; }

.post-full { margin-bottom: 40px; }
.post-full-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}
.author-info { margin-left: 4px; }
.author-info .post-username { display: block; }
.author-info .post-time { font-size: 0.8rem; }

.post-full-title { font-size: 1.6rem; margin-bottom: 20px; line-height: 1.4; }
.post-full-content {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 20px;
}
/* Rich text content styling */
.post-full-content h1, .post-full-content h2, .post-full-content h3 {
    margin: 0.8em 0 0.4em;
    line-height: 1.3;
}
.post-full-content h1 { font-size: 1.6rem; }
.post-full-content h2 { font-size: 1.3rem; }
.post-full-content h3 { font-size: 1.1rem; }
.post-full-content p { margin-bottom: 0.8em; }
.post-full-content ul, .post-full-content ol {
    margin: 0.5em 0;
    padding-left: 1.8em;
}
.post-full-content li { margin-bottom: 0.3em; }
.post-full-content blockquote {
    border-left: 4px solid var(--accent);
    padding: 8px 16px;
    margin: 12px 0;
    background: var(--bg-secondary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-secondary);
}
.post-full-content pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    overflow-x: auto;
    font-size: 0.9rem;
    margin: 12px 0;
}
.post-full-content code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}
.post-full-content pre code { background: none; padding: 0; }
.post-full-content a { color: var(--accent); }
.post-full-content img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin: 8px 0;
}
.post-full-actions { padding-top: 16px; border-top: 1px solid var(--border); }

.like-btn.liked { background: var(--danger-bg); color: var(--danger); border-color: var(--danger); }

/* ===== Comments ===== */
.comments-section { border-top: 2px solid var(--border); padding-top: 28px; }
.comments-section h3 { margin-bottom: 18px; font-size: 1.15rem; }

.comment-form { margin-bottom: 24px; }
.comment-form textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    resize: vertical;
    min-height: 60px;
    font-family: inherit;
    margin-bottom: 8px;
}
.comment-form textarea:focus { outline: none; border-color: var(--accent); }

.login-hint { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 16px; }

.comments-list { display: flex; flex-direction: column; gap: 16px; }
.comment-item { display: flex; gap: 12px; }
.comment-avatar { flex-shrink: 0; }
.comment-body { flex: 1; }
.comment-header { display: flex; gap: 12px; align-items: baseline; margin-bottom: 4px; }
.comment-username { font-weight: 600; font-size: 0.9rem; color: var(--text-primary); }
.comment-time { font-size: 0.75rem; color: var(--text-muted); }
.comment-content { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; }
.no-comments { color: var(--text-muted); text-align: center; padding: 20px; }

/* ===== Page Header ===== */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.page-header h2 { font-size: 1.5rem; }

/* ===== Tables ===== */
.posts-table, .admin-table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow-x: auto;
    box-shadow: var(--shadow-sm);
}
table { width: 100%; border-collapse: collapse; }
thead { background: var(--bg-secondary); }
th, td { padding: 12px 16px; text-align: left; font-size: 0.9rem; border-bottom: 1px solid var(--border); }
th { font-weight: 600; color: var(--text-secondary); white-space: nowrap; }
td { color: var(--text-primary); }
tr:last-child td { border-bottom: none; }
.action-cell { display: flex; gap: 6px; }

/* ===== Profile ===== */
.profile-page { max-width: 768px; margin: 0 auto; padding: 40px 0; }

.profile-card {
    display: flex;
    gap: 24px;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 40px;
    box-shadow: var(--shadow-sm);
    flex-wrap: wrap;
}
.profile-info { flex: 1; min-width: 200px; }
.profile-name { font-size: 1.4rem; display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.profile-bio { color: var(--text-secondary); margin-bottom: 12px; line-height: 1.6; }
.profile-bio.muted { color: var(--text-muted); font-style: italic; }
.profile-meta { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 14px; }

.profile-posts h3 { margin-bottom: 16px; font-size: 1.15rem; }

/* ===== Admin ===== */
.admin-page { max-width: 960px; margin: 0 auto; padding: 32px 0; }
.admin-page > h2 { margin-bottom: 28px; font-size: 1.5rem; }
.admin-section { margin-bottom: 36px; }
.admin-section h3 { margin-bottom: 14px; font-size: 1.1rem; }
.muted { color: var(--text-muted); font-size: 0.9rem; }

.admin-nav-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 28px;
    border-bottom: 2px solid var(--border);
    padding-bottom: 0;
}
.admin-tab {
    padding: 8px 18px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all var(--transition);
    border-radius: 0;
}
.admin-tab:hover { color: var(--accent); }
.admin-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* ===== Report Modal ===== */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9999;
    align-items: center;
    justify-content: center;
}
.modal-overlay.show { display: flex; }
.modal-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 480px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}
.modal-header h3 { margin: 0; font-size: 1.1rem; }
.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0 4px;
    line-height: 1;
}
.modal-close:hover { color: var(--text-primary); }
.modal-body {
    padding: 20px;
}
.modal-body .form-group { margin-bottom: 16px; }
.modal-body .form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* ===== Report Buttons ===== */
.report-btn {
    font-size: 0.8rem !important;
    opacity: 0.7;
}
.report-btn:hover { opacity: 1; color: var(--danger); }
.report-btn-comment {
    margin-left: auto;
    font-size: 0.75rem !important;
    padding: 2px 8px !important;
    opacity: 0.5;
    border: none !important;
    background: none !important;
}
.report-btn-comment:hover { opacity: 1; color: var(--danger); }

/* ===== Sensitive Word Management ===== */
.sensitive-form { margin-bottom: 0; }
.sensitive-form .form-textarea, .modal-body .form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    resize: vertical;
    margin-bottom: 12px;
}
.sensitive-form-inline {
    display: flex;
    gap: 10px;
}
.sensitive-form-inline .form-input {
    flex: 1;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
}
.sensitive-word-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.sensitive-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: var(--danger-bg);
    color: var(--danger);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}
.tag-delete-btn {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 1.1rem;
    padding: 0 2px;
    line-height: 1;
    opacity: 0.7;
}
.tag-delete-btn:hover { opacity: 1; }

/* Report table extras */
.row-resolved { opacity: 0.6; }
.row-dismissed { opacity: 0.5; }
.desc-cell { max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.target-title { font-weight: 500; }
.badge-muted { background: var(--border); color: var(--text-muted); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-admin { background: var(--accent-light); color: var(--accent); }

/* ===== Appeal Styles ===== */
.appeal-link-bar {
    margin-top: 24px;
    padding: 16px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border: 1px solid var(--border);
}
.appeal-link-bar span { color: var(--text-secondary); font-size: 0.9rem; }
.appeal-events { display: flex; flex-direction: column; gap: 12px; margin-bottom: 24px; }
.appeal-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}
.appeal-card-info { display: flex; flex-direction: column; gap: 4px; }
.appeal-card-type { font-weight: 600; font-size: 0.95rem; }
.appeal-card-reason { font-size: 0.85rem; color: var(--text-secondary); }
.appeal-card-time { font-size: 0.8rem; color: var(--text-muted); }
.appeal-actions { display: flex; gap: 8px; }

/* ===== Board Info ===== */
.post-board-info { margin-bottom: 12px; }

/* ===== Form Select ===== */
.form-select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    cursor: pointer;
    transition: border var(--transition);
    -webkit-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}
.form-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-light);
}

/* ===== Form Divider ===== */
.form-divider {
    display: flex;
    align-items: center;
    margin: 24px 0 18px;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.form-divider::before,
.form-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}
.form-divider span {
    padding: 0 16px;
}

/* ===== File Upload ===== */
.file-upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 32px 20px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg-secondary);
}
.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--accent);
    background: var(--accent-light);
}
.file-upload-icon { font-size: 2.5rem; margin-bottom: 8px; }
.file-upload-text { font-size: 0.95rem; color: var(--text-primary); margin-bottom: 4px; }
.file-upload-hint { font-size: 0.8rem; color: var(--text-muted); }
.file-input-hidden {
    position: absolute;
    width: 1px; height: 1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
}

.file-preview {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.current-avatar-preview {
    display: flex;
    align-items: center;
    margin-bottom: 4px;
}
.section-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ===== Posts Section (header) ===== */
.posts-section { padding: 40px 0 60px; }
.section-header { margin-bottom: 24px; }
.section-header h2 { font-size: 1.5rem; color: var(--text-primary); }

/* ===== Forgot Password ===== */
.forgot-password-info {
    padding: 8px 0 16px;
}
.forgot-step {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: 12px;
    margin-bottom: 20px;
}
.step-icon { font-size: 2rem; flex-shrink: 0; }
.step-content h3 { font-size: 1rem; color: var(--text-primary); margin-bottom: 4px; }
.step-content p { font-size: 0.9rem; color: var(--text-muted); }
.forgot-wechat {
    text-align: center;
    padding: 24px;
    border: 2px dashed var(--border);
    border-radius: 12px;
    background: var(--bg-primary);
}
.wechat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.wechat-id {
    font-size: 1.6rem;
    font-weight: 700;
    color: #07c160;
    letter-spacing: 2px;
    margin-bottom: 16px;
    font-family: inherit;
}
.copy-btn {
    cursor: pointer;
    min-width: 140px;
}

/* ===== Footer ===== */
.footer {
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
    padding: 24px;
    text-align: center;
    margin-top: auto;
}
.footer-inner p { font-size: 0.85rem; color: var(--text-muted); }
.footer-links { margin-top: 10px; }
.footer-links a { font-size: 0.82rem; color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: var(--primary); }
.footer-sep { color: var(--border); margin: 0 10px; }

/* ===== Douyin OAuth ===== */
.oauth-divider {
    display: flex;
    align-items: center;
    margin: 20px 0 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.oauth-divider::before,
.oauth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}
.oauth-divider span { padding: 0 14px; }

.oauth-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.btn-douyin {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: #111;
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.2s;
}
.btn-douyin:hover {
    opacity: 0.85;
    color: #fff;
}
.btn-douyin svg {
    flex-shrink: 0;
}

[data-theme="dark"] .btn-douyin {
    background: #252525;
}

/* Douyin link card in edit profile */
.oauth-link-section {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.oauth-link-section h3 {
    font-size: 1rem;
    margin-bottom: 16px;
}
.edit-profile-links {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}
.oauth-link-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
}
.oauth-link-info {
    display: flex;
    align-items: center;
    gap: 12px;
}
.oauth-link-icon {
    font-size: 1.5rem;
}
.oauth-link-info p {
    margin: 0;
    font-size: 0.82rem;
}
.oauth-link-info p.muted {
    color: var(--text-muted);
}

/* ===== Legal Pages ===== */
.legal-page { max-width: 860px; margin: 0 auto; padding: 40px 20px; }
.legal-page h1 { font-size: 1.8rem; color: var(--text-primary); margin-bottom: 4px; }
.legal-update { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 32px; }
.legal-section { margin-bottom: 28px; }
.legal-section h2 { font-size: 1.15rem; color: var(--text-primary); margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid var(--border); }
.legal-section p { font-size: 0.93rem; color: var(--text-primary); line-height: 1.8; margin-bottom: 8px; }
.legal-section ul { padding-left: 22px; margin-bottom: 8px; }
.legal-section ul li { font-size: 0.93rem; color: var(--text-primary); line-height: 1.8; margin-bottom: 4px; }
.legal-section a { color: var(--primary); text-decoration: none; }
.legal-section a:hover { text-decoration: underline; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    /* Navbar */
    .nav-inner { padding: 0 12px; gap: 8px; }
    .nav-links { gap: 2px; }
    .nav-links a { padding: 4px 6px; font-size: 0.75rem; }
    .logo-text { font-size: 0.9rem; }
    .search-box input { width: 60px; font-size: 0.8rem; }
    .user-menu { gap: 6px; }
    .user-menu .btn-sm { padding: 4px 8px; font-size: 0.7rem; }

    /* Hero */
    .hero { padding: 40px 16px 30px; }
    .hero-title { font-size: 1.6rem; }
    .hero-subtitle { font-size: 0.9rem; margin-bottom: 20px; }

    /* Container */
    .container { padding: 16px 14px; }

    /* Features */
    .features-grid { grid-template-columns: 1fr 1fr; }

    /* Forum Table → stacked layout */
    .forum-row:not(.forum-row-header) {
        flex-wrap: wrap;
        padding: 12px 14px;
        gap: 8px;
    }
    .forum-col-main { flex: 1 1 100%; order: 1; }
    .forum-col-topic { flex: 1 1 100%; order: 1; min-width: 100%; }
    .forum-col-author { flex: 0 0 auto; order: 2; font-size: 0.8rem; }
    .forum-col-replies { flex: 0 0 auto; order: 3; text-align: left; }
    .forum-col-time { flex: 0 0 auto; order: 4; text-align: left; }
    .forum-col-stats { flex: 0 0 auto; order: 2; text-align: left; }
    .forum-col-last { flex: 1 1 100%; order: 3; text-align: left; }
    .forum-row-header { display: none; }
    .forum-last-post { align-items: flex-start; }
    .forum-last-title { max-width: 100%; }
    .forum-topic-title,
    .forum-topic-excerpt { white-space: normal; }

    /* Board Cards */
    .boards-grid, .board-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
    .board-card { padding: 14px 16px; }

    /* Board Header */
    .board-header { padding: 16px; }
    .board-header-info h2 { font-size: 1.15rem; }

    /* Post Cards */
    .post-card { padding: 14px 16px; }

    /* Post Detail */
    .post-detail { padding: 20px 0; }
    .post-full-title { font-size: 1.3rem; }

    /* Auth */
    .auth-card { padding: 24px; max-width: 100%; }
    .auth-page { padding: 24px 12px; min-height: auto; }

    /* Forms */
    .form-actions { flex-direction: column; }
    .form-actions .btn { width: 100%; justify-content: center; }

    /* Profile */
    .profile-card { flex-direction: column; text-align: center; }
    .profile-page { padding: 20px 0; }

    /* Tables → scroll */
    .posts-table, .admin-table-wrap { font-size: 0.8rem; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    th, td { padding: 8px 10px; white-space: nowrap; }

    /* Admin */
    .admin-page { padding: 20px 0; }
    .admin-nav-tabs { overflow-x: auto; -webkit-overflow-scrolling: touch; flex-wrap: nowrap; }
    .admin-tab { white-space: nowrap; flex-shrink: 0; }

    /* Legal */
    .legal-page { padding: 24px 14px; }
    .legal-page h1 { font-size: 1.4rem; }

    /* Footer */
    .footer { padding: 16px 14px; }
    .footer-inner p { font-size: 0.78rem; }

    /* Section header */
    .section-header h2 { font-size: 1.2rem; }
}
@media (max-width: 480px) {
    /* Navbar: hide search, reduce logo */
    .search-box { display: none; }
    .logo-text { font-size: 0.8rem; max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .nav-inner { gap: 4px; }
    .nav-links a { padding: 4px 5px; font-size: 0.7rem; }
    .nav-actions { gap: 6px; }

    /* Hero */
    .hero-title { font-size: 1.3rem; }
    .hero-actions { flex-direction: column; align-items: center; }

    /* Features */
    .features-grid { grid-template-columns: 1fr; }

    /* Board Cards → single column */
    .boards-grid, .board-grid { grid-template-columns: 1fr; }

    /* Post Detail */
    .post-full-title { font-size: 1.15rem; }
    .post-full-content { font-size: 0.9rem; }

    /* Forum Rows */
    .forum-row { padding: 10px 12px; }

    /* Auth */
    .auth-card { padding: 18px; }
    .auth-header h2 { font-size: 1.25rem; }

    /* Container */
    .container { padding: 12px 10px; }

    /* Legal */
    .legal-page { padding: 20px 10px; }
    .legal-section h2 { font-size: 1rem; }

    /* Comments */
    .comment-item { gap: 8px; }
}


/* ========== Error Page ========== */

.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--nav-height) - 200px);
    padding: 40px 20px;
}

.error-card {
    text-align: center;
    max-width: 480px;
    width: 100%;
    animation: errorFadeIn 0.5s ease;
}

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

.error-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 16px;
    color: var(--text-muted);
    opacity: 0.5;
}

.error-card .error-code {
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.03em;
    color: var(--accent);
    margin-bottom: 4px;
}

.error-card .error-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 12px;
}

.error-card .error-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0 0 28px;
}

.error-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.error-actions .btn {
    min-width: 120px;
}

/* 移动端适配 */
@media (max-width: 480px) {
    .error-card .error-code {
        font-size: 3.5rem;
    }
    .error-actions {
        flex-direction: column;
        align-items: center;
    }
    .error-actions .btn {
        width: 100%;
    }
}


/* ========== Settings Page ========== */

.settings-page { max-width: 680px; margin: 0 auto; padding: 20px 0; }
.settings-title { font-size: 1.5rem; margin-bottom: 28px; color: var(--text-primary); }
.settings-section {
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}
.settings-section:last-of-type { border-bottom: none; }
.settings-section h3 { font-size: 1.05rem; margin-bottom: 6px; color: var(--text-primary); }
.settings-desc { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 14px; }
.settings-row {
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    padding: 14px 18px; background: var(--bg-secondary);
    border: 1px solid var(--border); border-radius: var(--radius-md);
}
.settings-row strong { font-size: 0.93rem; }
.settings-row .muted { margin: 2px 0 0; font-size: 0.78rem; }
.settings-back { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--border); }

@media (max-width: 480px) {
    .settings-row { flex-direction: column; align-items: flex-start; }
    .settings-row .btn { width: 100%; }
}


/* ========== Merge Account Page ========== */

.merge-page { max-width: 640px; margin: 0 auto; padding: 20px 0; }
.merge-title { font-size: 1.5rem; margin-bottom: 8px; color: var(--text-primary); }
.merge-desc { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.7; }
.merge-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: 24px;
}
.merge-step-badge {
    display: inline-block; background: var(--accent); color: #fff;
    font-size: 0.75rem; font-weight: 600; padding: 3px 10px;
    border-radius: 99px; margin-bottom: 12px;
}
.merge-card h3 { font-size: 1.1rem; margin-bottom: 6px; }
.merge-card .muted { font-size: 0.85rem; margin-bottom: 18px; line-height: 1.6; }

.merge-form .form-group { margin-bottom: 16px; }
.merge-form .form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; color: var(--text-primary); }
.merge-form .form-group input {
    width: 100%; padding: 10px 14px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); background: var(--bg); color: var(--text-primary);
    font-size: 0.9rem; box-sizing: border-box;
}
.merge-form .form-group input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(var(--accent-rgb, 99 102 241), 0.15); }

/* 对比面板 */
.merge-comparison {
    display: flex; align-items: center; gap: 16px; margin: 20px 0;
}
.merge-account {
    flex: 1; border: 2px solid var(--border); border-radius: var(--radius-md);
    overflow: hidden;
}
.merge-account-keep { border-color: var(--success, #22c55e); }
.merge-account-delete { border-color: var(--danger, #ef4444); }
.merge-account-label {
    font-size: 0.72rem; font-weight: 700; padding: 6px 12px; text-align: center;
    color: #fff; text-transform: uppercase; letter-spacing: 0.04em;
}
.merge-label-keep { background: var(--success, #22c55e); }
.merge-label-delete { background: var(--danger, #ef4444); }
.merge-account-body {
    display: flex; flex-direction: column; align-items: center;
    gap: 6px; padding: 18px 12px 12px; text-align: center;
}
.merge-account-body strong { font-size: 0.95rem; }
.merge-account-body .muted { font-size: 0.75rem; color: var(--text-muted); }
.merge-stats {
    display: flex; justify-content: center; gap: 16px;
    padding: 10px 12px; background: var(--bg); font-size: 0.78rem;
    color: var(--text-secondary); border-top: 1px solid var(--border);
}
.merge-arrow {
    font-size: 1.5rem; font-weight: 700; color: var(--text-muted);
    flex-shrink: 0;
}

/* 合并摘要 */
.merge-summary {
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 16px 18px; margin: 16px 0;
}
.merge-summary h4 { font-size: 0.9rem; margin-bottom: 10px; color: var(--text-primary); }
.merge-summary ul { padding-left: 0; list-style: none; margin: 0; font-size: 0.85rem; }
.merge-summary li { padding: 4px 0; color: var(--text-primary); line-height: 1.6; }

@media (max-width: 600px) {
    .merge-comparison { flex-direction: column; }
    .merge-arrow { transform: rotate(90deg); }
}


/* ========== Complete Registration Page ========== */

.complete-reg-page { max-width: 460px; margin: 0 auto; padding: 30px 0; }
.complete-reg-title { font-size: 1.5rem; margin-bottom: 8px; color: var(--text-primary); }
.complete-reg-desc { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 24px; }

.complete-reg-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius-md); padding: 28px;
}

/* 抖音用户信息 */
.dy-user-info {
    display: flex; align-items: center; gap: 14px;
    padding: 14px 16px; margin-bottom: 24px;
    background: var(--bg); border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.dy-user-info strong { font-size: 0.95rem; color: var(--text-primary); }
.dy-user-info .muted { font-size: 0.78rem; color: var(--text-muted); margin-top: 2px; }
.dy-avatar {
    width: 48px; height: 48px; border-radius: 50%; object-fit: cover; flex-shrink: 0;
}
.dy-avatar-default {
    display: flex; align-items: center; justify-content: center;
    background: var(--accent); color: #fff; font-weight: 700; font-size: 1.1rem;
}

/* 表单 */
.complete-reg-form .form-group { margin-bottom: 18px; }
.complete-reg-form .form-group label {
    display: block; font-size: 0.85rem; font-weight: 600;
    margin-bottom: 6px; color: var(--text-primary);
}
.complete-reg-form .form-group input {
    width: 100%; padding: 10px 14px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); background: var(--bg);
    color: var(--text-primary); font-size: 0.9rem; box-sizing: border-box;
}
.complete-reg-form .form-group input:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
.form-hint {
    display: block; font-size: 0.75rem; color: var(--text-muted); margin-top: 4px;
}
.btn-block { width: 100%; justify-content: center; }

.complete-reg-footer {
    margin-top: 20px; text-align: center;
    padding-top: 16px; border-top: 1px solid var(--border);
}
.complete-reg-footer a {
    font-size: 0.85rem; color: var(--text-muted); text-decoration: none;
}
.complete-reg-footer a:hover { color: var(--accent); }

/* ========== Page Transition Animation ========== */
@keyframes pageIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}
.main-content { animation: pageIn 0.35s ease; }

/* ========== Skeleton Loading ========== */
@keyframes shimmer {
    0% { background-position: -400px 0; }
    100% { background-position: 400px 0; }
}
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border) 50%, var(--bg-secondary) 75%);
    background-size: 800px 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: var(--radius-sm);
}
.skeleton-text { height: 16px; margin-bottom: 8px; }
.skeleton-title { height: 24px; width: 60%; margin-bottom: 12px; }
.skeleton-avatar { width: 48px; height: 48px; border-radius: 50%; flex-shrink: 0; }
.skeleton-card {
    display: flex; gap: 16px; padding: 20px 24px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius);
}
.skeleton-card-body { flex: 1; }

/* ========== Mobile Hamburger Menu ========== */
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    color: var(--text-primary);
}
.hamburger-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    margin: 5px 0;
    transition: var(--transition);
}
.hamburger-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger-btn.active span:nth-child(2) { opacity: 0; }
.hamburger-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
}
.mobile-menu-overlay.show { display: block; }

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--nav-height);
    right: 0;
    width: 260px;
    max-width: 80vw;
    bottom: 0;
    background: var(--bg-card);
    border-left: 1px solid var(--border);
    z-index: 100;
    padding: 16px;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
}
.mobile-nav.show { transform: translateX(0); }
.mobile-nav a {
    display: block;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.92rem;
    transition: background var(--transition);
    margin-bottom: 2px;
}
.mobile-nav a:hover { background: var(--accent-light); color: var(--accent); }
.mobile-nav .mobile-nav-divider {
    height: 1px;
    background: var(--border);
    margin: 10px 0;
}
.mobile-nav .mobile-search {
    margin-bottom: 12px;
}
.mobile-nav .mobile-search form {
    display: flex;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}
.mobile-nav .mobile-search input {
    flex: 1;
    border: none;
    padding: 8px 12px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.88rem;
    outline: none;
}
.mobile-nav .mobile-search button {
    border: none;
    background: var(--accent);
    color: #fff;
    padding: 8px 12px;
    cursor: pointer;
}

/* ========== Scroll to Top ========== */
.scroll-top-btn {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
    z-index: 90;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: all var(--transition-slow);
    display: flex;
    align-items: center;
    justify-content: center;
}
.scroll-top-btn.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
.scroll-top-btn:hover { background: var(--accent-hover); transform: translateY(-2px); }

/* ========== Transitions & Hover Effects ========== */
tr {
    transition: background var(--transition);
}
tr:hover { background: var(--bg-secondary); }
thead tr:hover { background: var(--bg-secondary); }

/* ========== Focus & Accessibility ========== */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
button:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.2);
}

/* skip link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 16px;
    background: var(--accent);
    color: #fff;
    padding: 8px 16px;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    z-index: 200;
    font-size: 0.85rem;
    transition: top var(--transition);
}
.skip-link:focus { top: 0; }

/* ========== Tooltip ========== */
[data-tooltip] {
    position: relative;
    cursor: help;
}
[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition);
    z-index: 150;
}
[data-tooltip]:hover::after { opacity: 1; }

/* ========== Card Hover Lift ========== */
.hover-lift {
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.hover-lift:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent);
}

/* ========== Pulse Dot (notification indicator) ========== */
.pulse-dot {
    display: inline-block;
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--danger);
    animation: pulse 1.8s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ========== Inline Code ========== */
:not(pre) > code {
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.88em;
    border: 1px solid var(--border);
}

/* ========== Responsive Enhancements ========== */
@media (max-width: 768px) {
    .hamburger-btn { display: block; }
    .nav-links { display: none; }
    .nav-actions { gap: 6px; }
    .search-box { display: none; }
    .mobile-nav { display: block; }

    .post-full-content img {
        max-width: 100% !important;
        height: auto !important;
    }
    .forum-board-desc { font-size: 0.8rem; }
}

@media (max-width: 480px) {
    .hamburger-btn { display: block; }
    .scroll-top-btn { bottom: 16px; right: 16px; width: 38px; height: 38px; }
    .user-menu .btn-sm { font-size: 0.7rem; padding: 3px 6px; }
}