:root {
    --bg-body: #ffffff;
    --bg-surface: #f6f8fa;
    --bg-elevated: #ffffff;
    --bg-hover: rgba(0, 0, 0, 0.04);
    --border-subtle: #d0d7de;
    --border-strong: #8b949e;
    --text-primary: #1f2328;
    --text-secondary: #24292f;
    --text-muted: #57606a;
    --link-color: #0969da;
    --link-hover: #0550ae;
    --accent-blue: #0969da;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.08);
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

body.dark-theme {
    --bg-body: #0d1117;
    --bg-surface: #161b22;
    --bg-elevated: #1c2333;
    --bg-hover: rgba(56, 139, 253, 0.08);
    --border-subtle: #30363d;
    --border-strong: #484f58;
    --text-primary: #e6edf3;
    --text-secondary: #c9d1d9;
    --text-muted: #8b949e;
    --link-color: #58a6ff;
    --link-hover: #79c0ff;
    --accent-blue: #1f6feb;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.3);
}

*,
*::before,
*::after {
    transition: none !important;
    border-radius: 0 !important;
}

html {
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}
h1 { font-size: 1.8rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

a {
    color: var(--link-color);
    text-decoration: none;
}
a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

code, pre {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    background-color: var(--bg-surface) !important;
    border-bottom: 1px solid var(--border-subtle) !important;
    padding: 0.5rem 1rem !important;
}
.navbar .navbar-brand {
    font-weight: 700;
    color: var(--text-primary) !important;
}
.navbar .nav-link {
    color: var(--text-secondary) !important;
}
.navbar .nav-link:hover {
    color: var(--text-primary) !important;
    background: var(--bg-hover) !important;
}
.navbar .navbar-toggler {
    border-color: var(--border-subtle) !important;
}
.navbar .dropdown-menu {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-subtle) !important;
}
.navbar .dropdown-item {
    color: var(--text-secondary) !important;
}
.navbar .dropdown-item:hover {
    background: var(--bg-hover) !important;
    color: var(--text-primary) !important;
}

.card {
    background-color: var(--bg-elevated) !important;
    border: 1px solid var(--border-subtle) !important;
    box-shadow: var(--shadow-card) !important;
    margin-bottom: 1rem;
}
.card-header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    font-weight: 600;
    color: var(--text-primary);
}
.card-body {
    color: var(--text-secondary);
}

body.dark-theme .card.bg-primary {
    background-color: #1a3a6b !important;
}
body.dark-theme .card.bg-success {
    background-color: #1a4a2a !important;
}
body.dark-theme .card.bg-warning {
    background-color: #4a3a1a !important;
}
body.dark-theme .card.bg-danger {
    background-color: #4a1a1a !important;
}
body.dark-theme .card.bg-info {
    background-color: #1a3a4a !important;
}
body.dark-theme .card.bg-warning .card-header,
body.dark-theme .card.bg-warning .card-body {
    color: #e6edf3 !important;
}

body.dark-theme .btn-outline-primary {
    color: #58a6ff !important;
    border-color: #58a6ff !important;
}
body.dark-theme .btn-outline-primary:hover {
    background-color: #58a6ff !important;
    color: #0d1117 !important;
}
body.dark-theme .btn-outline-success {
    color: #3fb950 !important;
    border-color: #3fb950 !important;
}
body.dark-theme .btn-outline-success:hover {
    background-color: #3fb950 !important;
    color: #0d1117 !important;
}
body.dark-theme .btn-outline-warning {
    color: #d29922 !important;
    border-color: #d29922 !important;
}
body.dark-theme .btn-outline-warning:hover {
    background-color: #d29922 !important;
    color: #0d1117 !important;
}
body.dark-theme .btn-outline-danger {
    color: #f85149 !important;
    border-color: #f85149 !important;
}
body.dark-theme .btn-outline-danger:hover {
    background-color: #f85149 !important;
    color: #0d1117 !important;
}
body.dark-theme .btn-outline-secondary {
    color: #8b949e !important;
    border-color: #8b949e !important;
}
body.dark-theme .btn-outline-secondary:hover {
    background-color: #8b949e !important;
    color: #0d1117 !important;
}
body.dark-theme .btn-outline-dark {
    color: #e6edf3 !important;
    border-color: #e6edf3 !important;
}
body.dark-theme .btn-outline-dark:hover {
    background-color: #e6edf3 !important;
    color: #0d1117 !important;
}

.list-group-item {
    background-color: var(--bg-elevated) !important;
    border: 1px solid var(--border-subtle) !important;
    color: var(--text-primary);
}
.list-group-item-action:hover {
    background-color: var(--bg-hover) !important;
}
.list-group-item .text-muted {
    color: var(--text-muted) !important;
}
.list-group-item a:not(.btn) {
    color: var(--link-color);
}
.list-group-item a:not(.btn):hover {
    color: var(--link-hover);
}

#notifications-list .list-group-item {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 14px;
    padding: 10px 16px;
    margin-bottom: 4px;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-left-width: 3px;
    border-left-style: solid;
    border-left-color: var(--link-color);
    box-shadow: none;
    font-size: 0.95rem;
}

#notifications-list .list-group-item.type-info {
    border-left-color: var(--link-color);
}
#notifications-list .list-group-item.type-warning {
    border-left-color: #d29922;
}
#notifications-list .list-group-item.type-danger {
    border-left-color: #cf222e;
}
#notifications-list .list-group-item.type-success {
    border-left-color: #2da44e;
}

#notifications-list .list-group-item .badge {
    font-weight: 500;
    margin-right: 4px;
    background-color: transparent !important;
    color: var(--text-muted);
    border: none;
    padding: 0;
}
#notifications-list .list-group-item .badge.type-info {
    color: var(--link-color);
}
#notifications-list .list-group-item .badge.type-warning {
    color: #d29922;
}
#notifications-list .list-group-item .badge.type-danger {
    color: #cf222e;
}
#notifications-list .list-group-item .badge.type-success {
    color: #2da44e;
}

#notifications-list .list-group-item .notification-message {
    display: inline;
    color: var(--text-primary);
    line-height: 1.5;
}
#notifications-list .list-group-item .notification-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: 6px;
}

.alert {
    border: 1px solid var(--border-subtle) !important;
    background-color: var(--bg-surface) !important;
    color: var(--text-primary) !important;
    border-radius: 0 !important;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
}
.alert-info {
    border-left: 4px solid var(--link-color) !important;
}
.alert-success {
    border-left: 4px solid #2da44e !important;
}
.alert-warning {
    border-left: 4px solid #d29922 !important;
}
.alert-danger {
    border-left: 4px solid #cf222e !important;
}
.alert .btn-close {
    filter: none !important;
}
body.dark-theme .alert .btn-close {
    filter: invert(1) !important;
}

body.dark-theme .list-group-item-action:hover,
body.dark-theme .list-group-item-action:focus {
    color: var(--text-primary) !important;
    background-color: var(--bg-hover) !important;
}
body.dark-theme .list-group-item-action:hover a,
body.dark-theme .list-group-item-action:focus a,
body.dark-theme .list-group-item-action:hover .text-muted,
body.dark-theme .list-group-item-action:focus .text-muted {
    color: var(--text-primary) !important;
}
body.dark-theme .list-group-item-action:hover .text-muted {
    color: var(--text-muted) !important;
}
body.dark-theme .list-group-item-action:hover a:not(.btn) {
    color: var(--link-hover) !important;
}
body.dark-theme .list-group-item-action a:not(.btn) {
    color: var(--link-color);
}

.table {
    color: var(--text-primary);
}
.table thead th {
    background-color: var(--bg-surface);
    border-bottom: 2px solid var(--border-subtle);
    color: var(--text-secondary);
    font-weight: 600;
}
.table td,
.table th {
    border-color: var(--border-subtle);
}
.table-striped tbody tr:nth-of-type(odd) {
    background-color: var(--bg-surface);
}
.table-hover tbody tr:hover {
    background-color: var(--bg-hover);
}

.form-control,
.form-select {
    background-color: var(--bg-elevated) !important;
    border: 1px solid var(--border-subtle) !important;
    color: var(--text-primary) !important;
}
.form-control:focus,
.form-select:focus {
    border-color: var(--link-color) !important;
    box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15) !important;
}
body.dark-theme .form-control:focus,
body.dark-theme .form-select:focus {
    box-shadow: 0 0 0 3px rgba(56, 139, 253, 0.15) !important;
}
.form-control::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

.btn {
    border-radius: 0 !important;
    font-weight: 500;
    border: 1px solid var(--border-subtle);
    background-color: var(--bg-surface);
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 30px;
    padding: 0 14px;
    line-height: 1;
}
.btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}
.btn-sm {
    height: 24px;
    padding: 0 10px;
    font-size: 0.8rem;
}
.btn-primary {
    background-color: var(--accent-blue) !important;
    border-color: var(--accent-blue) !important;
    color: #fff !important;
}
.btn-primary:hover {
    background-color: var(--link-hover) !important;
    border-color: var(--link-hover) !important;
}
.btn-outline-primary {
    color: var(--link-color) !important;
    border-color: var(--link-color) !important;
}
.btn-outline-primary:hover {
    background-color: var(--link-color) !important;
    color: #fff !important;
}
.btn-success {
    background-color: #2da44e !important;
    border-color: #2da44e !important;
    color: #fff !important;
}
.btn-success:hover {
    background-color: #22863a !important;
    border-color: #22863a !important;
}
.btn-danger {
    background-color: #cf222e !important;
    border-color: #cf222e !important;
    color: #fff !important;
}
.btn-danger:hover {
    background-color: #a0111f !important;
    border-color: #a0111f !important;
}
.btn-warning {
    background-color: #d29922 !important;
    border-color: #d29922 !important;
    color: #0d1117 !important;
}
.btn-warning:hover {
    background-color: #b8871a !important;
    border-color: #b8871a !important;
}
.btn-secondary {
    background-color: var(--bg-surface) !important;
    border-color: var(--border-subtle) !important;
    color: var(--text-secondary) !important;
}
.btn-secondary:hover {
    background-color: var(--bg-hover) !important;
}

.btn-check:checked + .btn-outline-primary {
    background-color: var(--accent-blue) !important;
    border-color: var(--accent-blue) !important;
    color: #fff !important;
}
.btn-check:checked + .btn-outline-primary:hover {
    background-color: var(--link-hover) !important;
    border-color: var(--link-hover) !important;
}

.pagination .page-link {
    border: 1px solid var(--border-subtle) !important;
    color: var(--text-secondary) !important;
    background-color: var(--bg-elevated) !important;
}
.pagination .page-link:hover {
    background-color: var(--bg-hover) !important;
}
.pagination .page-item.active .page-link {
    background-color: var(--accent-blue) !important;
    border-color: var(--accent-blue) !important;
    color: #fff !important;
}
.pagination .page-item.disabled .page-link {
    opacity: 0.5;
}

.breadcrumb {
    background-color: transparent !important;
    padding: 0.5rem 0;
}
.breadcrumb-item a {
    color: var(--link-color);
}
.breadcrumb-item.active {
    color: var(--text-secondary);
}
.breadcrumb-item + .breadcrumb-item::before {
    color: var(--text-muted);
}

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

.profile-header {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
}
.profile-avatar img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border: 2px solid var(--border-subtle);
}
.profile-info {
    flex: 1;
}
.profile-username {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}
.profile-role {
    margin-bottom: 10px;
}
.profile-role .badge {
    font-weight: 500;
}
.profile-actions .btn {
    border-radius: 0 !important;
}

.profile-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
}
@media (max-width: 768px) {
    .profile-grid {
        grid-template-columns: 1fr;
    }
    .profile-header {
        flex-direction: column;
        text-align: center;
    }
}

.profile-left .card,
.profile-right .card {
    background-color: var(--bg-elevated) !important;
    border-color: var(--border-subtle) !important;
}
.profile-left .card-header,
.profile-right .card-header {
    background-color: var(--bg-surface) !important;
    border-bottom-color: var(--border-subtle) !important;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 20px;
}
.stat-item {
    display: flex;
    justify-content: space-between;
}
.stat-label {
    color: var(--text-muted);
}
.stat-value {
    font-weight: 500;
    color: var(--text-primary);
}

.profile-topic-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-subtle);
}
.profile-topic-item:last-child {
    border-bottom: none;
}
.topic-title {
    font-weight: 500;
    color: var(--link-color);
}
.topic-title:hover {
    color: var(--link-hover);
    text-decoration: underline;
}
.topic-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
    display: flex;
    gap: 15px;
}

.message-self {
    background-color: var(--accent-blue) !important;
    color: #fff !important;
}
.message-other {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-subtle) !important;
}

.pinned-section .card-header {
    background: #ffd700 !important;
    border-bottom: 2px solid #e6a800;
    color: #1a1a1a !important;
    font-weight: 700;
}
body.dark-theme .pinned-section .card-header {
    background: #ffd700 !important;
    color: #1a1a1a !important;
}
.pinned-topic {
    background: #fffdf0 !important;
    border-left: 4px solid #ffd700 !important;
}
.pinned-topic:hover {
    background: #fff8d6 !important;
}
body.dark-theme .pinned-topic {
    background: #2d2800 !important;
    border-left-color: #ffd700 !important;
}
body.dark-theme .pinned-topic:hover {
    background: #3d3500 !important;
}
.pinned-icon {
    display: inline-block;
    vertical-align: middle;
    margin-right: 4px;
}

.nav-tabs {
    border-bottom: 1px solid var(--border-subtle);
}
.nav-tabs .nav-link {
    border: none !important;
    color: var(--text-secondary);
    background: transparent;
}
.nav-tabs .nav-link:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.nav-tabs .nav-link.active {
    background: var(--bg-elevated) !important;
    color: var(--text-primary) !important;
    border-bottom: 2px solid var(--link-color) !important;
}
.nav-tabs .nav-link.disabled {
    color: var(--text-muted);
}

.modal-content {
    background-color: var(--bg-elevated) !important;
    border: 1px solid var(--border-subtle) !important;
}
.modal-header {
    border-bottom: 1px solid var(--border-subtle);
}
.modal-footer {
    border-top: 1px solid var(--border-subtle);
}
.modal .btn-close {
    filter: none !important;
}
body.dark-theme .modal .btn-close {
    filter: invert(1) !important;
}

.online-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50% !important;
    background-color: #2da44e;
    margin-left: 4px;
    vertical-align: middle;
}
.offline-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50% !important;
    background-color: var(--text-muted);
    margin-left: 4px;
    vertical-align: middle;
}

.social-icon {
    width: 24px;
    height: 24px;
    fill: currentColor;
    flex-shrink: 0;
}
body.dark-theme .social-icon {
    fill: var(--text-secondary);
}
body.dark-theme .social-icon:hover {
    fill: var(--link-color);
}

pre {
    background-color: var(--bg-surface);
    padding: 1rem;
    border: 1px solid var(--border-subtle);
    overflow-x: auto;
    color: var(--text-primary);
}
.copy-code-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
}
.copy-code-btn:hover {
    background: var(--bg-hover);
}

footer {
    background-color: var(--bg-surface) !important;
    border-top: 1px solid var(--border-subtle) !important;
    color: var(--text-muted) !important;
}
footer .text-muted {
    color: var(--text-muted) !important;
}
footer.bg-light {
    background-color: var(--bg-surface) !important;
}

body.dark-theme .text-muted,
body.dark-theme .text-secondary {
    color: #b0bcd6 !important;
}

.badge,
.dropdown-menu,
.modal-content,
.card,
.list-group-item,
.btn,
.form-control,
.form-select,
.navbar,
.pagination .page-link,
.alert,
.table,
.table th,
.table td,
.breadcrumb,
.nav-tabs .nav-link {
    border-radius: 0 !important;
}