:root {
    --bg-color: #000000;          /* PURE OLED BLACK */
    --card-bg: #09090b;            /* OLED Card Dark Surface */
    --sidebar-bg: #000000;         /* OLED Sidebar Pitch Black */
    --accent-color: #38bdf8;       /* Electric Blue Accent */
    --accent-hover: #0284c7;
    --text-primary: #ffffff;
    --text-secondary: #71717a;
    --border-color: #18181b;       /* Subtle Dark Border */
    --success-color: #4ade80;
    --danger-color: #f87171;
    --warning-color: #fbbf24;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    padding-left: 8px;
}

.brand img {
    width: 28px;
    height: 28px;
}

.nav-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.nav-item a:hover, .nav-item.active a {
    background-color: rgba(56, 189, 248, 0.08);
    color: var(--accent-color);
}

.main-content {
    flex: 1;
    padding: 32px 40px;
    overflow-y: auto;
    background-color: #000000;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 28px;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 18px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.stat-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 18px 20px;
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 6px;
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
}

th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge {
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.badge-active { background-color: rgba(74, 222, 128, 0.1); color: var(--success-color); border: 1px solid rgba(74, 222, 128, 0.2); }
.badge-suspended { background-color: rgba(248, 113, 113, 0.1); color: var(--danger-color); border: 1px solid rgba(248, 113, 113, 0.2); }

.btn {
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.875rem;
    border: none;
    cursor: pointer;
    background-color: var(--accent-color);
    color: #000000;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn:hover {
    background-color: var(--accent-hover);
}

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

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.btn-icon {
    padding: 6px 10px;
    font-size: 0.8rem;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 9px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background-color: #000000;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-color);
}