:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-glass: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --success: #22c55e;
    --border: rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    --font-family: 'Inter', sans-serif;
    --logo-gradient-start: #60a5fa;
    --logo-gradient-end: #3b82f6;
}

:root[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --success: #22c55e;
    --border: rgba(0, 0, 0, 0.1);
    --shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
    --logo-gradient-start: #2563eb;
    --logo-gradient-end: #1d4ed8;
}

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

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

/* Glassmorphism utilities */
.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
}

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

.sidebar {
    width: 280px;
    background: var(--bg-secondary);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    border-right: 1px solid var(--border);
}

.sidebar h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--logo-gradient-start), var(--logo-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent);
}

.main-content {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

/* UI Elements */
.btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.btn-danger {
    background: var(--danger);
}
.btn-danger:hover {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-family);
    transition: border-color 0.3s ease;
    margin-bottom: 1rem;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr {
    transition: background-color 0.2s ease;
}

tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-card h3 {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Login */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: radial-gradient(circle at top right, var(--bg-secondary), var(--bg-primary));
}

.login-box {
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
}

.login-box h1 {
    text-align: center;
    margin-bottom: 2rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease forwards;
}

/* Tags */
.badge {
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
}
.badge.success { background: rgba(34, 197, 94, 0.2); color: #4ade80; }
.badge.danger { background: rgba(239, 68, 68, 0.2); color: #f87171; }

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding: 1rem 1.5rem;
        border-right: none;
        border-bottom: 1px solid var(--border);
        gap: 1rem;
    }
    
    .sidebar h1 {
        justify-content: center;
        margin-bottom: 0.5rem;
    }

    .nav-links {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }
    
    .nav-links a {
        padding: 0.5rem 0.75rem;
        font-size: 0.875rem;
    }

    .main-content {
        padding: 1rem;
    }

    .header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .header > div {
        width: 100%;
    }

    .header > div:last-child {
        justify-content: space-between;
    }

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

    .table-responsive,
    [style*="overflow-x: auto"] {
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    table {
        min-width: 600px; /* Prevent table collapsing too much */
    }
    
    .login-box {
        padding: 1.5rem;
    }
}