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

:root {
    --primary-color: #2563eb;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --status-available: #22c55e;
    --status-unavailable: #ef4444;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.site-stats {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: var(--text-secondary);
}

.site-stats em {
    font-style: normal;
    color: var(--primary-color);
    font-weight: 600;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary-color);
}

/* Main */
.main {
    padding: 32px 0;
    min-height: calc(100vh - 140px);
}

/* Search Bar */
.search-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 0;
}

.search-bar input {
    flex: 1;
    max-width: 400px;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    font-size: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.submit-site-btn {
    margin-left: auto;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
    white-space: nowrap;
}

.submit-site-btn:hover {
    background: #1d4ed8;
}

/* Category Tabs */
.category-tabs {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 16px 0;
    margin-bottom: 24px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.category-tabs::-webkit-scrollbar {
    display: none;
}

.category-tab {
    flex-shrink: 0;
    padding: 8px 20px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.category-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.category-tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Sites Grid */
.sites-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

/* Site Card */
.site-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    gap: 12px;
    text-decoration: none;
    color: inherit;
}

.site-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.site-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    object-fit: contain;
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    overflow: hidden;
}

.site-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.site-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    flex: 1;
}

.site-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-dot.available {
    background: var(--status-available);
    box-shadow: 0 0 6px var(--status-available);
}

.status-dot.unavailable {
    background: var(--status-unavailable);
}

.status-text.available {
    color: var(--status-available);
}

.status-text.unavailable {
    color: var(--status-unavailable);
}

.site-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Footer */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
}

/* Admin Page */
.admin-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 20px;
}

.login-card {
    max-width: 400px;
    margin: 100px auto;
    background: var(--card-bg);
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow);
}

.login-card h2 {
    text-align: center;
    margin-bottom: 32px;
    color: var(--text-primary);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
    text-align: center;
    text-decoration: none;
}

.btn:hover {
    background: #1d4ed8;
}

.btn-secondary {
    background: var(--text-secondary);
}

.btn-secondary:hover {
    background: #475569;
}

.btn-danger {
    background: var(--status-unavailable);
}

.btn-danger:hover {
    background: #dc2626;
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

/* Admin Hidden */
.admin-hidden {
    display: none;
}

/* Admin Header */
.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.admin-header h1 {
    font-size: 20px;
    color: var(--text-primary);
}

.admin-nav {
    display: flex;
    gap: 16px;
}

.admin-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    cursor: pointer;
    transition: color 0.2s;
}

.admin-nav a:hover,
.admin-nav a.active {
    color: var(--primary-color);
}

/* Admin Panel */
.admin-panel {
    display: none;
}

.admin-panel.active {
    display: block;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.panel-header h2 {
    font-size: 18px;
    color: var(--text-primary);
}

/* Table */
.data-table {
    width: 100%;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.data-table th,
.data-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--bg-color);
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.data-table td {
    font-size: 14px;
    color: var(--text-secondary);
}

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

.data-table tr:hover td {
    background: var(--bg-color);
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 32px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

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

.modal-header h3 {
    font-size: 18px;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-footer {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* Filter */
.filter-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.filter-group select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14px;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .sites-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .site-card {
        padding: 16px;
    }

    .site-icon {
        width: 40px;
        height: 40px;
    }

    .site-title {
        font-size: 14px;
    }

    .site-description {
        font-size: 12px;
    }

    .login-card {
        margin: 60px 20px;
    }

    .data-table {
        display: block;
        overflow-x: auto;
    }

    .admin-header {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

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