:root, [data-theme="emerald"], html[data-theme="emerald"], body[data-theme="emerald"] {
    --bg: #f7faf8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #edf4f0;
    --text: #192e24;
    --text-secondary: #52665c;
    --text-muted: #7e9489;
    --border: #dfe7e2;
    --primary: #059669;
    --primary-hover: #047857;
    --primary-light: #ecfdf5;
    --primary-glow: rgba(5, 150, 105, 0.15);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    --link: #059669;
    --link-hover: #047857;
    --shadow: 0 1px 3px rgba(15, 35, 25, 0.05);
    --shadow-lg: 0 6px 18px rgba(15, 35, 25, 0.08);
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 12px;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    --header-bg: #ffffff;
    --header-border: #e2ece5;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --input-border: #cbd9d1;
    --badge-bg: #e3ede7;
    --sticky-bg: #f0fdf4;
    --avatar-bg: #059669;
    --footer-bg: #f0f5f2;
}

[data-theme="dark"], html[data-theme="dark"], body[data-theme="dark"] {
    --bg: #0a1510;
    --bg-secondary: #11221a;
    --bg-tertiary: #182f25;
    --text: #e3ece7;
    --text-secondary: #92aba0;
    --text-muted: #5e7a6d;
    --border: #1f382c;
    --primary: #34d399;
    --primary-hover: #6ee7b7;
    --primary-light: #132e22;
    --primary-glow: rgba(52, 211, 153, 0.2);
    --link: #34d399;
    --link-hover: #6ee7b7;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 6px 18px rgba(0, 0, 0, 0.4);
    --header-bg: #11221a;
    --header-border: #1f382c;
    --card-bg: #11221a;
    --input-bg: #0a1510;
    --input-border: #1f382c;
    --badge-bg: #182f25;
    --sticky-bg: #142d22;
    --avatar-bg: #059669;
    --footer-bg: #0c1813;
}

/* Bright Ocean Blue Theme */
[data-theme="blue"], html[data-theme="blue"], body[data-theme="blue"], [data-theme="ocean_blue"], html[data-theme="ocean_blue"], body[data-theme="ocean_blue"] {
    --bg: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-glow: rgba(37, 99, 235, 0.15);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #0284c7;
    --link: #2563eb;
    --link-hover: #1d4ed8;
    --shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
    --shadow-lg: 0 6px 18px rgba(15, 23, 42, 0.08);
    --header-bg: #ffffff;
    --header-border: #e2e8f0;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --input-border: #cbd5e1;
    --badge-bg: #e2e8f0;
    --sticky-bg: #eff6ff;
    --avatar-bg: #2563eb;
    --footer-bg: #f1f5f9;
}

[data-theme="blue_dark"], html[data-theme="blue_dark"], body[data-theme="blue_dark"] {
    --bg: #0b1329;
    --bg-secondary: #111c38;
    --bg-tertiary: #17254a;
    --text: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #1e293b;
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-light: #162a52;
    --primary-glow: rgba(59, 130, 246, 0.2);
    --link: #60a5fa;
    --link-hover: #93c5fd;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 6px 18px rgba(0, 0, 0, 0.5);
    --header-bg: #111c38;
    --header-border: #1e293b;
    --card-bg: #111c38;
    --input-bg: #0b1329;
    --input-border: #1e293b;
    --badge-bg: #17254a;
    --sticky-bg: #162a52;
    --avatar-bg: #2563eb;
    --footer-bg: #080e1e;
}

/* Vietnam Flag (Cờ Đỏ Sao Vàng) Theme */
[data-theme="vietnam"], html[data-theme="vietnam"], body[data-theme="vietnam"], [data-theme="vietnam_flag"], html[data-theme="vietnam_flag"], body[data-theme="vietnam_flag"] {
    --bg: #fdfbf7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #faede5;
    --text: #2c1810;
    --text-secondary: #634335;
    --text-muted: #8c6756;
    --border: #f0ddd1;
    --primary: #da251d;
    --primary-hover: #b91c1c;
    --primary-light: #fef2f2;
    --primary-glow: rgba(218, 37, 29, 0.15);
    --accent: #ffcd00;
    --accent-hover: #eab308;
    --success: #16a34a;
    --danger: #dc2626;
    --warning: #d97706;
    --info: #0284c7;
    --link: #da251d;
    --link-hover: #b91c1c;
    --shadow: 0 1px 3px rgba(44, 24, 16, 0.05);
    --shadow-lg: 0 6px 18px rgba(44, 24, 16, 0.08);
    --header-bg: #ffffff;
    --header-border: #f0ddd1;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --input-border: #e8cfc0;
    --badge-bg: #faede5;
    --sticky-bg: #fef2f2;
    --avatar-bg: #da251d;
    --footer-bg: #faede5;
}

[data-theme="vietnam_dark"], html[data-theme="vietnam_dark"], body[data-theme="vietnam_dark"] {
    --bg: #180907;
    --bg-secondary: #23100e;
    --bg-tertiary: #301714;
    --text: #faede5;
    --text-secondary: #c9a799;
    --text-muted: #8c6756;
    --border: #3b1e1a;
    --primary: #ef4444;
    --primary-hover: #f87171;
    --primary-light: #381512;
    --primary-glow: rgba(239, 68, 68, 0.2);
    --accent: #facc15;
    --link: #f87171;
    --link-hover: #fca5a5;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 6px 18px rgba(0, 0, 0, 0.5);
    --header-bg: #23100e;
    --header-border: #3b1e1a;
    --card-bg: #23100e;
    --input-bg: #180907;
    --input-border: #3b1e1a;
    --badge-bg: #301714;
    --sticky-bg: #381512;
    --avatar-bg: #da251d;
    --footer-bg: #110504;
}

/* Specific Component Overrides for Blue Theme */
html[data-theme="blue"] .site-header, body[data-theme="blue"] .site-header {
    border-top: 3px solid #2563eb;
}
html[data-theme="blue"] .btn-primary, body[data-theme="blue"] .btn-primary {
    background-color: #2563eb !important;
}
html[data-theme="blue"] .btn-primary:hover, body[data-theme="blue"] .btn-primary:hover {
    background-color: #1d4ed8 !important;
}
html[data-theme="blue"] .site-logo, body[data-theme="blue"] .site-logo {
    color: #2563eb !important;
}
html[data-theme="blue"] .site-logo i, body[data-theme="blue"] .site-logo i {
    color: #2563eb !important;
}

/* Blue Dark Theme Specifics */
html[data-theme="blue_dark"] .site-header, body[data-theme="blue_dark"] .site-header {
    border-top: 3px solid #3b82f6;
    background: #0f1a36;
    border-bottom: 1px solid #1e2f5c;
}
html[data-theme="blue_dark"] .btn-primary, body[data-theme="blue_dark"] .btn-primary {
    background-color: #2563eb !important;
}
html[data-theme="blue_dark"] .site-logo, body[data-theme="blue_dark"] .site-logo {
    color: #60a5fa !important;
}
html[data-theme="blue_dark"] .site-logo i, body[data-theme="blue_dark"] .site-logo i {
    color: #60a5fa !important;
}

/* Specific Component Overrides for Vietnam Flag Theme */
html[data-theme="vietnam"] .site-header, body[data-theme="vietnam"] .site-header {
    border-top: 3px solid #da251d;
}
html[data-theme="vietnam"] .btn-primary, body[data-theme="vietnam"] .btn-primary {
    background: linear-gradient(135deg, #da251d 0%, #b91c1c 100%) !important;
    color: #ffffff !important;
    box-shadow: 0 2px 8px rgba(218, 37, 29, 0.25);
}
html[data-theme="vietnam"] .btn-primary:hover, body[data-theme="vietnam"] .btn-primary:hover {
    background: linear-gradient(135deg, #b91c1c 0%, #991b1b 100%) !important;
}
html[data-theme="vietnam"] .site-logo, body[data-theme="vietnam"] .site-logo {
    color: #da251d !important;
}
html[data-theme="vietnam"] .site-logo i, body[data-theme="vietnam"] .site-logo i {
    color: #da251d !important;
}
html[data-theme="vietnam"] .badge-primary, body[data-theme="vietnam"] .badge-primary {
    background-color: #da251d !important;
    color: #ffffff !important;
}

/* Vietnam Flag Dark Theme Specifics */
html[data-theme="vietnam_dark"] .site-header, body[data-theme="vietnam_dark"] .site-header {
    border-top: 3px solid #ef4444;
    background: #220b08;
    border-bottom: 1px solid #441712;
}
html[data-theme="vietnam_dark"] .btn-primary, body[data-theme="vietnam_dark"] .btn-primary {
    background: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%) !important;
    color: #ffffff !important;
    box-shadow: 0 2px 10px rgba(239, 68, 68, 0.3);
}
html[data-theme="vietnam_dark"] .site-logo, body[data-theme="vietnam_dark"] .site-logo {
    color: #ef4444 !important;
}
html[data-theme="vietnam_dark"] .site-logo i, body[data-theme="vietnam_dark"] .site-logo i {
    color: #ef4444 !important;
}
html[data-theme="vietnam_dark"] .badge-primary, body[data-theme="vietnam_dark"] .badge-primary {
    background-color: #ef4444 !important;
    color: #ffffff !important;
}

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

html { font-size: 15.225px; scroll-behavior: smooth; }
html.admin-html { font-size: 14.75px !important; }

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--link); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--link-hover); }

.container { width: 100%; max-width: 1260px; margin: 0 auto; padding: 0 16px; }

/* Header */
.site-header {
    background: var(--header-bg);
    border-bottom: 1px solid var(--header-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    height: 56px;
}

.site-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
}

.main-nav { display: flex; gap: 16px; flex: 1; }
.main-nav a { color: var(--text-secondary); font-weight: 500; font-size: 0.9rem; }
.main-nav a:hover { color: var(--primary); }

.header-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }

.user-menu { position: relative; }
.user-menu-trigger {
    background: none; border: none; color: var(--text);
    cursor: pointer; display: flex; align-items: center; gap: 8px;
    font-size: 0.9rem; font-family: inherit;
}

.dropdown-menu {
    position: absolute; right: 0; top: 100%; margin-top: 8px;
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); box-shadow: var(--shadow-lg);
    min-width: 200px; display: none; z-index: 200;
}
.dropdown-menu.show { display: block; }
.dropdown-menu a {
    display: block; padding: 8px 16px; color: var(--text);
    font-size: 0.9rem;
}
.dropdown-menu a:hover { background: var(--bg-secondary); }
.dropdown-menu hr { border: none; border-top: 1px solid var(--border); margin: 4px 0; }

.notification-bell { position: relative; cursor: pointer; font-size: 1.2rem; }
.notif-count {
    position: absolute; top: -6px; right: -8px;
    background: var(--danger); color: #fff; font-size: 0.7rem;
    padding: 1px 5px; border-radius: 10px;
}

.theme-toggle {
    background: none; border: 1px solid var(--border);
    border-radius: var(--radius-sm); padding: 4px 8px;
    cursor: pointer; font-size: 1rem; color: var(--text);
}

/* Main */
.site-main { flex: 1; padding: 24px 0; }

/* Footer */
.site-footer {
    background: var(--footer-bg);
    border-top: 1px solid var(--border);
    padding: 16px 0;
    margin-top: auto;
}
.footer-inner {
    display: flex; justify-content: space-between;
    font-size: 0.85rem; color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 20px; border-radius: var(--radius-sm);
    font-size: 0.9rem; font-weight: 500; border: none;
    cursor: pointer; transition: all 0.2s; font-family: inherit;
    text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); color: #fff; }
.btn-secondary { background: var(--bg-tertiary); color: var(--text); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 4px 12px; font-size: 0.8rem; }
.btn-block { width: 100%; justify-content: center; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 4px; font-weight: 500; font-size: 0.9rem; }
.form-control {
    width: 100%; padding: 8px 12px; border: 1px solid var(--input-border);
    border-radius: var(--radius-sm); font-size: 0.9rem; font-family: inherit;
    background: var(--input-bg); color: var(--text); transition: border-color 0.2s;
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-light); }
.form-control.is-invalid { border-color: var(--danger); }
.form-control-sm { padding: 4px 8px; font-size: 0.8rem; width: auto; }
.invalid-feedback { color: var(--danger); font-size: 0.8rem; margin-top: 4px; display: block; }
.form-check label { display: flex; align-items: center; gap: 8px; font-weight: normal; }
.form-actions { display: flex; align-items: center; gap: 12px; margin-top: 16px; }
textarea.form-control { resize: vertical; min-height: 80px; }

/* Alerts */
.alert {
    padding: 12px 16px; border-radius: var(--radius-sm);
    margin-bottom: 16px; font-size: 0.9rem;
}
.alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert-info { background: #d1ecf1; color: #0c5460; border: 1px solid #bee5eb; }

[data-theme="dark"] .alert-success { background: #1a3a2a; color: #7dcea0; border-color: #2a5a3a; }
[data-theme="dark"] .alert-danger { background: #3a1a1a; color: #e07070; border-color: #5a2a2a; }
[data-theme="dark"] .alert-info { background: #1a2a3a; color: #70b0d0; border-color: #2a4a5a; }

/* Tables */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
.table th { font-weight: 600; background: var(--bg-secondary); }
.table tr.pass td:nth-child(2) { color: var(--success); }
.table tr.fail td:nth-child(2) { color: var(--danger); font-weight: bold; }

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; gap: 6px; margin-bottom: 16px; font-size: 0.85rem; flex-wrap: wrap; }
.breadcrumb .sep { color: var(--text-muted); }
.breadcrumb .current { color: var(--text-secondary); }

/* Pagination */
.pagination { display: flex; gap: 4px; justify-content: center; margin-top: 24px; }
.page-link {
    padding: 6px 12px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text); font-size: 0.85rem;
}
.page-link.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.page-link:hover:not(.active) { background: var(--bg-secondary); }
.page-dots { padding: 6px 4px; color: var(--text-muted); }

/* Avatars */
.avatar-placeholder {
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--avatar-bg); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 1.2rem;
}
.avatar-placeholder.sm, .avatar-sm { width: 36px; height: 36px; border-radius: 50%; font-size: 0.9rem; }
.avatar-placeholder.xs, .avatar-xs { width: 28px; height: 28px; border-radius: 50%; font-size: 0.7rem; }
img.avatar-sm, img.avatar-xs { object-fit: cover; }

/* Badges */
.badge {
    display: inline-block; padding: 2px 8px; border-radius: 10px;
    font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
}
.badge-sticky { background: var(--warning); color: #fff; }
.badge-locked { background: var(--text-muted); color: #fff; }
.badge-featured { background: var(--success); color: #fff; }

/* Forum Home */
.forum-home { display: grid; grid-template-columns: 1fr 280px; gap: 24px; }

.category-block {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); overflow: hidden; margin-bottom: 20px;
}
.category-header {
    padding: 12px 16px; background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}
.category-header h2 { font-size: 1rem; }
.category-header h2 a { color: var(--text); }
.category-header p { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px; }

.forum-row {
    display: grid; grid-template-columns: 40px 1fr 120px 200px;
    gap: 12px; align-items: center;
    padding: 12px 16px; border-bottom: 1px solid var(--border);
    transition: background 0.1s;
}
.forum-row:last-child { border-bottom: none; }
.forum-row:hover { background: var(--bg-secondary); }
.forum-icon { font-size: 1.5rem; text-align: center; }
.forum-info h3 { font-size: 0.95rem; }
.forum-desc { font-size: 0.8rem; color: var(--text-secondary); margin-top: 2px; }
.forum-stats { font-size: 0.8rem; color: var(--text-secondary); text-align: center; }
.forum-stats span { display: block; }
.forum-last-post { font-size: 0.8rem; }
.forum-last-post .meta { display: block; color: var(--text-secondary); }
.forum-last-post .empty { color: var(--text-muted); }

/* Sidebar */
.forum-sidebar { grid-column: 2; }
.sidebar-block {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 16px; margin-bottom: 16px;
}
.sidebar-block h3 { font-size: 0.9rem; margin-bottom: 12px; }
.stat-list { list-style: none; }
.stat-list li { display: flex; justify-content: space-between; padding: 4px 0; font-size: 0.85rem; }
.newest-users { display: flex; flex-wrap: wrap; gap: 8px; }
.user-chip {
    display: flex; align-items: center; gap: 4px;
    font-size: 0.8rem; background: var(--bg-secondary);
    padding: 4px 10px; border-radius: 20px;
}

/* Thread List */
.thread-list-header {
    display: grid; grid-template-columns: 1fr 130px 200px;
    gap: 12px; padding: 8px 16px; font-size: 0.8rem;
    font-weight: 600; color: var(--text-secondary);
    background: var(--bg-secondary); border-radius: var(--radius) var(--radius) 0 0;
    border: 1px solid var(--border); border-bottom: none;
}

.thread-row {
    display: grid; grid-template-columns: 40px 1fr 130px 200px;
    gap: 12px; align-items: center;
    padding: 12px 16px; border: 1px solid var(--border); border-top: none;
    background: var(--card-bg); transition: background 0.1s;
}
.thread-row:last-child { border-radius: 0 0 var(--radius) var(--radius); }
.thread-row:hover { background: var(--bg-secondary); }
.thread-row.sticky { background: var(--sticky-bg); }
.thread-info h3 { font-size: 0.95rem; }
.thread-badges { display: flex; gap: 4px; margin-bottom: 2px; }
.thread-author { font-size: 0.8rem; color: var(--text-secondary); }
.thread-stats { font-size: 0.8rem; color: var(--text-secondary); text-align: center; }
.thread-stats span { display: block; }
.thread-last-post { font-size: 0.8rem; }
.thread-last-post span { display: block; color: var(--text-secondary); }

/* Thread Header */
.thread-header { margin-bottom: 24px; }
.thread-header h1 { font-size: 1.5rem; margin-bottom: 8px; }
.thread-meta { display: flex; gap: 16px; font-size: 0.85rem; color: var(--text-secondary); flex-wrap: wrap; }

/* Post List */
.post-block {
    display: grid; grid-template-columns: 180px 1fr;
    border: 1px solid var(--border); border-radius: var(--radius);
    margin-bottom: 16px; overflow: hidden; background: var(--card-bg);
}

.post-author {
    padding: 16px; background: var(--bg-secondary);
    text-align: center; border-right: 1px solid var(--border);
}
.author-avatar { margin-bottom: 8px; }
.author-avatar img, .author-avatar .avatar-placeholder { margin: 0 auto; width: 64px; height: 64px; }
.author-name { display: block; font-weight: 600; font-size: 0.9rem; }
.author-group { display: block; font-size: 0.75rem; color: var(--text-secondary); margin-top: 2px; }
.author-stats { font-size: 0.75rem; color: var(--text-muted); margin-top: 8px; }
.author-stats span { display: block; }

.staff-admin { color: var(--danger) !important; }
.staff-mod { color: var(--primary) !important; }

.post-body { padding: 16px; }
.post-header { display: flex; justify-content: space-between; margin-bottom: 12px; font-size: 0.8rem; color: var(--text-secondary); }
.post-content { line-height: 1.7; word-wrap: break-word; overflow-wrap: break-word; }
.post-content blockquote {
    border-left: 3px solid var(--primary); padding: 8px 16px;
    margin: 12px 0; background: var(--bg-secondary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.post-content pre { background: var(--bg-tertiary); padding: 12px; border-radius: var(--radius-sm); overflow-x: auto; }
.post-content code { font-family: var(--font-mono); font-size: 0.9em; }
.post-content img { max-width: 100%; height: auto; border-radius: var(--radius-sm); }
.post-content .embed-responsive { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; margin: 12px 0; border-radius: var(--radius-sm); }
.post-content .embed-responsive iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.post-edited { font-size: 0.75rem; color: var(--text-muted); margin-top: 12px; font-style: italic; }
.post-actions { display: flex; gap: 8px; margin-top: 16px; padding-top: 12px; border-top: 1px solid var(--border); }
.btn-action {
    background: none; border: none; color: var(--text-secondary);
    cursor: pointer; font-size: 0.8rem; padding: 4px 8px;
    border-radius: var(--radius-sm); font-family: inherit;
}
.btn-action:hover { background: var(--bg-secondary); color: var(--primary); }

/* Mention */
.mention { color: var(--primary); font-weight: 500; }

/* Reply Form */
.reply-form {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 20px; margin-top: 24px;
}
.reply-form h3 { margin-bottom: 12px; }
.login-prompt {
    text-align: center; padding: 24px; background: var(--bg-secondary);
    border-radius: var(--radius); margin-top: 24px;
}

/* Auth Pages */
.auth-container { display: flex; justify-content: center; align-items: center; min-height: 100vh; padding: 20px; }
.auth-card {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 40px; width: 100%; max-width: 420px;
    box-shadow: var(--shadow-lg);
}
.auth-title { text-align: center; color: var(--primary); margin-bottom: 8px; }
.auth-card h2 { text-align: center; margin-bottom: 24px; font-size: 1.2rem; color: var(--text-secondary); }
.auth-links { display: flex; justify-content: space-between; margin-top: 20px; font-size: 0.85rem; }

/* Installer */
.installer { max-width: 600px; margin: 40px auto; }
.installer-header { text-align: center; margin-bottom: 24px; }
.installer-header h1 { color: var(--primary); }
.installer-steps { display: flex; justify-content: center; gap: 12px; margin-bottom: 32px; }
.step {
    width: 36px; height: 36px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 600; font-size: 0.85rem;
    background: var(--bg-tertiary); color: var(--text-secondary);
}
.step.active { background: var(--primary); color: #fff; }
.step.done { background: var(--success); color: #fff; }
.installer-body { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; }
.installer-body h2 { margin-bottom: 16px; }
.installer-actions { display: flex; justify-content: space-between; margin-top: 24px; }
.success-box { text-align: center; padding: 20px; }
.success-box h2 { color: var(--success); }

/* Profile */
.profile-header {
    display: flex; gap: 24px; align-items: flex-start;
    padding: 24px; background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); margin-bottom: 24px;
}
.profile-avatar img, .profile-avatar .avatar-placeholder { width: 96px; height: 96px; font-size: 2.5rem; }
.profile-info h1 { font-size: 1.5rem; margin-bottom: 4px; }
.profile-info .username { color: var(--text-secondary); }
.profile-info .bio { margin-top: 8px; color: var(--text-secondary); }
.profile-stats { display: flex; gap: 20px; margin-top: 12px; font-size: 0.9rem; }
.profile-meta { font-size: 0.8rem; color: var(--text-muted); margin-top: 8px; display: flex; gap: 16px; }

.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 16px; }
.tab {
    background: none; border: none; padding: 8px 20px;
    cursor: pointer; font-size: 0.9rem; font-weight: 500;
    color: var(--text-secondary); border-bottom: 2px solid transparent;
    margin-bottom: -2px; font-family: inherit;
}
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }

.thread-item, .post-item {
    padding: 12px 0; border-bottom: 1px solid var(--border);
}
.thread-item a, .post-item a { font-weight: 500; }
.thread-meta, .post-meta { font-size: 0.8rem; color: var(--text-secondary); margin-top: 4px; }
.thread-meta span { margin-right: 12px; }
.post-excerpt { font-size: 0.85rem; color: var(--text-secondary); margin-top: 4px; }

/* Settings */
.settings-page { max-width: 600px; }
.settings-page h1 { margin-bottom: 20px; }
.current-avatar { margin-bottom: 8px; }
.current-avatar img { border-radius: 50%; }

/* Error Pages */
.error-page { text-align: center; padding: 80px 20px; }
.error-page h1 { font-size: 5rem; color: var(--primary); }
.error-page p { margin: 16px 0 24px; color: var(--text-secondary); }

/* Empty State */
.empty-state { text-align: center; padding: 40px; color: var(--text-secondary); }

/* Forum Header */
.forum-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 20px; }
.forum-header h1 { font-size: 1.3rem; }
.forum-header p { color: var(--text-secondary); font-size: 0.9rem; }

/* Create Thread */
.create-thread-page { max-width: 800px; }
.create-thread-page h1 { margin-bottom: 20px; font-size: 1.3rem; }

/* Admin Layout & Compact Proportions */
.admin-body {
    font-size: 13.65px;
    background: var(--bg);
}

.admin-body .site-header {
    box-shadow: 0 1px 2px rgba(15, 35, 25, 0.05);
}

.admin-body .header-inner {
    height: 46px;
    gap: 16px;
}

.admin-body .site-logo {
    font-size: 0.95rem;
    font-weight: 700;
}

.admin-body .site-main {
    padding: 16px 0;
}

.admin-body h1 { font-size: 1.15rem; font-weight: 600; margin-bottom: 12px; }
.admin-body h2 { font-size: 1.02rem; font-weight: 600; margin-bottom: 10px; }
.admin-body h3 { font-size: 0.92rem; font-weight: 600; margin-bottom: 8px; }
.admin-body h4 { font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }

.admin-body .form-group {
    margin-bottom: 10px;
}

.admin-body .form-group label {
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 3px;
    display: block;
}

.admin-body .form-control {
    font-size: 0.85rem;
    padding: 5px 9px;
    border-radius: 5px;
    height: 32px;
}

.admin-body select.form-control {
    height: 32px;
    padding: 4px 8px;
}

.admin-body textarea.form-control {
    height: auto;
    min-height: 70px;
    padding: 6px 9px;
}

.admin-body .btn {
    font-size: 0.82rem;
    padding: 5px 12px;
    border-radius: 5px;
}

.admin-body .btn-sm {
    font-size: 0.75rem;
    padding: 3px 8px;
}

.admin-body .btn-lg {
    font-size: 0.88rem;
    padding: 7px 16px;
}

.admin-body .table th {
    font-size: 0.76rem;
    font-weight: 600;
    padding: 6px 8px;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    color: var(--text-secondary);
}

.admin-body .table td {
    font-size: 0.82rem;
    padding: 6px 8px;
}

.admin-layout { display: grid; grid-template-columns: 200px 1fr; gap: 16px; min-height: 65vh; }
.admin-sidebar {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 10px;
}
.admin-sidebar a {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 9px; color: var(--text);
    border-radius: var(--radius-sm); font-size: 0.82rem; margin-bottom: 2px;
    font-weight: 500; text-decoration: none;
}
.admin-sidebar a i { width: 16px; text-align: center; font-size: 0.85rem; }
.admin-sidebar a:hover, .admin-sidebar a.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.admin-content {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 18px;
}
.admin-content h1 { font-size: 1.15rem; margin-bottom: 12px; }

.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat-card {
    background: var(--bg-secondary); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 14px; text-align: center;
}
.stat-card .stat-value { font-size: 1.4rem; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 0.78rem; color: var(--text-secondary); margin-top: 2px; }

/* Responsive */
@media (max-width: 768px) {
    .forum-home { grid-template-columns: 1fr; }
    .forum-sidebar { grid-column: 1; }
    .forum-row { grid-template-columns: 1fr; gap: 4px; }
    .forum-icon { display: none; }
    .forum-stats, .forum-last-post { display: none; }
    .thread-list-header { display: none; }
    .thread-row { grid-template-columns: 36px 1fr; }
    .thread-stats, .thread-last-post { display: none; }
    .post-block { grid-template-columns: 1fr; }
    .post-author {
        border-right: none; border-bottom: 1px solid var(--border);
        display: flex; align-items: center; gap: 12px; text-align: left; padding: 12px;
    }
    .author-avatar img, .author-avatar .avatar-placeholder { width: 40px; height: 40px; }
    .author-stats { display: none; }
    .header-inner { gap: 12px; }
    .main-nav { display: none; }
    .profile-header { flex-direction: column; align-items: center; text-align: center; }
    .profile-stats { justify-content: center; }
    .admin-layout { grid-template-columns: 1fr; }
    .footer-inner { flex-direction: column; gap: 4px; text-align: center; }
    .auth-card { padding: 24px; }
}

@media (max-width: 480px) {
    .container { padding: 0 12px; }
    .auth-card { padding: 20px 16px; }
    .installer-body { padding: 20px; }
}

/* Utility */
.text-danger { color: var(--danger); }
.text-success { color: var(--success); }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }

/* Phase 2: Polymorphic Reactions */
.reaction-container {
    position: relative;
    display: inline-block;
}

.reaction-picker {
    position: absolute;
    bottom: calc(100% + 6px);
    left: 0;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 30px;
    padding: 4px 8px;
    display: none;
    align-items: center;
    gap: 6px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: popupFade 0.2s ease-out;
}

@keyframes popupFade {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.reaction-container:hover .reaction-picker,
.reaction-picker:hover {
    display: flex;
}

.reaction-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.35rem;
    padding: 3px 5px;
    border-radius: 50%;
    transition: transform 0.15s ease, background 0.15s ease;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.reaction-btn:hover {
    transform: scale(1.35);
    background: var(--bg-secondary);
}

.reaction-summary-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 8px;
    padding-top: 6px;
    border-top: 1px dashed var(--border);
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.reaction-icons-group {
    display: inline-flex;
    align-items: center;
    margin-right: 4px;
}

.reaction-icon-mini {
    font-size: 0.95rem;
    margin-left: -3px;
    filter: drop-shadow(0 1px 2px rgba(0,0,0,0.15));
}
.reaction-icon-mini:first-child { margin-left: 0; }

.reaction-summary-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.82rem;
    font-weight: 600;
    padding: 0;
}
.reaction-summary-btn:hover {
    color: var(--primary);
    text-decoration: underline;
}

/* Phase 2: Tag Badges */
.tag-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    text-decoration: none;
    transition: all 0.15s ease;
}
.tag-badge:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

/* Phase 2: Mentions */
a.mention {
    color: var(--primary);
    font-weight: 600;
    background: var(--primary-light);
    padding: 1px 4px;
    border-radius: 4px;
    text-decoration: none;
}
a.mention:hover {
    text-decoration: underline;
}

/* Phase 2: Notifications Dropdown */
.notification-bell {
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    transition: background 0.15s;
    color: var(--text);
}
.notification-bell:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}
.notif-count {
    position: absolute;
    top: 2px;
    right: 2px;
    background: #ef4444;
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    border-radius: 10px;
    padding: 1px 5px;
    line-height: 1.2;
}

.notif-popup {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    width: 320px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    display: none;
    z-index: 1000;
}
.notif-popup.show {
    display: block;
}
.notif-popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    font-size: 0.88rem;
}
.notif-popup-body {
    max-height: 320px;
    overflow-y: auto;
}
.notif-popup-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    font-size: 0.82rem;
    text-decoration: none;
    color: var(--text);
    transition: background 0.15s;
}
.notif-popup-item:hover {
    background: var(--bg-secondary);
}
.notif-popup-item.unread {
    background: var(--primary-light);
}
.notif-popup-footer {
    text-align: center;
    padding: 8px;
    border-top: 1px solid var(--border);
    font-size: 0.82rem;
}