:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-blue: #4f8cff;
    --accent-blue-hover: #6b9fff;
    --accent-cyan: #58a6ff;
    --danger: #f85149;
    --success: #3fb950;
    --warning: #d29922;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

a:hover {
    color: var(--accent-blue-hover);
}

/* Navbar */
.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.navbar-brand {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar-brand .logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
}

.navbar-search {
    flex: 1;
    max-width: 480px;
    margin: 0 24px;
}

.navbar-search input {
    width: 100%;
    padding: 10px 16px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.navbar-search input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.15);
}

.navbar-search input::placeholder {
    color: var(--text-secondary);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: #fff;
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
    color: #fff;
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.btn-danger {
    background-color: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    opacity: 0.9;
    color: #fff;
}

.btn-success {
    background-color: var(--success);
    color: #fff;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Announcements */
.announcements-bar {
    background-color: var(--bg-secondary);
    border-left: 3px solid var(--accent-blue);
    padding: 12px 20px;
    margin: 20px 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.announcements-bar .announcement-item {
    font-size: 14px;
    color: var(--text-secondary);
}

.announcements-bar .announcement-item strong {
    color: var(--accent-blue);
}

/* Sample Grid */
.samples-section {
    padding: 20px 0 40px;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.section-title {
    font-size: 20px;
    font-weight: 600;
}

.samples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.sample-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.sample-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-blue);
}

.sample-card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sample-card-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.sample-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-secondary);
}

.sample-card-meta .downloads {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}

.pagination a,
.pagination span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border-radius: var(--radius-md);
    font-size: 14px;
    transition: all 0.2s;
}

.pagination a {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.pagination a:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.pagination span.current {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
    color: #fff;
}

/* Auth Pages */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 420px;
}

.auth-card .auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-card .auth-header h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.auth-card .auth-header p {
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.15);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-secondary);
}

.form-group .captcha-box {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: 16px;
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 8px;
    user-select: none;
}

.form-group .error {
    color: var(--danger);
    font-size: 13px;
    margin-top: 6px;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Sample Detail */
.sample-detail {
    padding: 40px 0;
}

.sample-detail-header {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 24px;
}

.sample-detail-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
}

.sample-detail-meta {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.sample-detail-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.sample-detail-desc {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-secondary);
    white-space: pre-wrap;
}

.sample-detail-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Admin Layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 260px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    padding: 20px 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
}

.admin-sidebar-brand {
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
    font-size: 18px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 10px;
}

.admin-sidebar-menu {
    list-style: none;
    padding: 0 12px;
}

.admin-sidebar-menu li {
    margin-bottom: 4px;
}

.admin-sidebar-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    transition: all 0.2s;
}

.admin-sidebar-menu a:hover,
.admin-sidebar-menu a.active {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.admin-sidebar-menu a.active {
    border-left: 2px solid var(--accent-blue);
}

.admin-main {
    flex: 1;
    margin-left: 260px;
    padding: 24px;
}

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.admin-header h1 {
    font-size: 22px;
    font-weight: 600;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: var(--bg-tertiary);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table td {
    color: var(--text-primary);
}

.data-table .actions {
    display: flex;
    gap: 8px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

/* Toast */
.toast {
    position: fixed;
    top: 80px;
    right: 24px;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    z-index: 1000;
    animation: slideIn 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.toast.success {
    background-color: var(--success);
    color: #fff;
}

.toast.error {
    background-color: var(--danger);
    color: #fff;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Share Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px;
    width: 90%;
    max-width: 480px;
    transform: scale(0.9);
    transition: transform 0.3s;
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.modal .share-url {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    word-break: break-all;
    margin-bottom: 16px;
    font-family: monospace;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-inner {
        flex-wrap: wrap;
        height: auto;
        padding: 12px 0;
        gap: 12px;
    }

    .navbar-search {
        order: 3;
        margin: 0;
        max-width: 100%;
        width: 100%;
    }

    .samples-grid {
        grid-template-columns: 1fr;
    }

    .admin-sidebar {
        width: 100%;
        position: relative;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .admin-main {
        margin-left: 0;
    }

    .admin-layout {
        flex-direction: column;
    }

    .data-table {
        font-size: 12px;
    }

    .data-table th,
    .data-table td {
        padding: 10px 8px;
    }
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.user-menu-trigger:hover {
    background-color: var(--bg-hover);
}

.user-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    min-width: 160px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all 0.2s;
    z-index: 200;
}

.user-menu-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-menu-dropdown a {
    display: block;
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 14px;
    transition: background-color 0.2s;
}

.user-menu-dropdown a:hover {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.user-menu-dropdown a:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.user-menu-dropdown a:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.stat-card-value {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-card-label {
    font-size: 14px;
    color: var(--text-secondary);
}