:root {
    --primary: #4f46e5;
    --bg-main: #f3f4f6;
    --card-bg: #ffffff;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background: var(--bg-main);
    color: var(--text-main);
}

.screen-center {
    display: flex;
    height: 100vh;
    justify-content: center;
    align-items: center;
}

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

.input-field {
    width: 100%;
    padding: 12px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
}

.input-field:focus {
    border-color: var(--primary);
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
}

.btn-outline:hover {
    background: var(--bg-main);
}

.btn-danger {
    background: #fee2e2;
    color: #dc2626;
    border: 1px solid #fca5a5;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
}

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

/* Dashboard Layout */
.header {
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 30px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
}

.main-layout {
    display: flex;
    height: calc(100vh - 70px);
    padding: 20px;
    gap: 20px;
}

.sidebar {
    width: 250px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.nav-btn {
    padding: 12px 16px;
    border: none;
    background: transparent;
    text-align: left;
    font-size: 1rem;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    transition: 0.2s;
}

.nav-btn:hover {
    background: var(--bg-main);
}

.nav-btn.active {
    background: #eef2ff;
    color: var(--primary);
    font-weight: 600;
    border-left: 4px solid var(--primary);
}

.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.stat-card {
    background: var(--bg-main);
    padding: 20px;
    border-radius: 12px;
    border-left: 4px solid var(--primary);
}

.stat-title {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-main);
}

/* Tables */
.table-container {
    width: 100%;
    overflow-x: auto;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.admin-table th {
    background: var(--bg-main);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9rem;
}

.admin-table tr:hover {
    background: #f9fafb;
}

.badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge.plus {
    background: #fef3c7;
    color: #d97706;
}

.badge.free {
    background: #e5e7eb;
    color: #4b5563;
}