:root {
    --bg-main: #0f172a;
    --bg-glass: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-red: #ef4444;
}

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

body {
    background: var(--bg-main);
    background-image: radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.15), transparent 25%),
                      radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 25%);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Glassmorphism Utility */
.glass {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.dashboard-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    margin: 20px;
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 40px;
    color: var(--accent-blue);
    font-size: 1.2rem;
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.nav-links li {
    padding: 14px 20px;
    border-radius: 12px;
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
}

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

/* Main Content */
.main-content {
    flex: 1;
    padding: 20px 40px 20px 0;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
}

.header-title h1 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.header-title p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.user-profile img {
    border-radius: 50%;
    width: 48px;
    height: 48px;
    border: 2px solid var(--accent-blue);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stat-card {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
}

.stat-icon.blue { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue); }
.stat-icon.purple { background: rgba(139, 92, 246, 0.15); color: var(--accent-purple); }
.stat-icon.green { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); }

.stat-details h3 {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.stat-details h2 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.trend.positive {
    color: var(--accent-green);
    font-size: 0.8rem;
    font-weight: 600;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 24px;
}

.chart-container, .table-container {
    padding: 24px;
    max-height: 500px;
    overflow-y: auto;
}

.chart-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.chart-container canvas {
    max-height: 350px !important;
}

.table-container h3, .chart-container h3 {
    margin-bottom: 20px;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.churn-table-container {
    grid-column: 1 / -1; /* spans full width */
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 14px;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

th {
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    font-size: 0.95rem;
}

.btn-action {
    background: rgba(59, 130, 246, 0.15);
    color: var(--accent-blue);
    border: 1px solid var(--accent-blue);
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.btn-action:hover {
    background: var(--accent-blue);
    color: #fff;
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
    border: 1px solid var(--accent-red);
}

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

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.page-btn {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    border: 1px solid var(--glass-border);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.page-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.page-btn.active {
    background: var(--accent-blue);
    color: #fff;
    border-color: var(--accent-blue);
}

/* Responsive Design */
@media (max-width: 768px) {
    .dashboard-container {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        margin: 0;
        padding: 15px 10px;
        border-radius: 0;
        border-left: none;
        border-right: none;
        border-top: none;
        margin-bottom: 10px;
    }
    .logo {
        margin-bottom: 20px;
        justify-content: center;
    }
    .nav-links {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }
    .nav-links li {
        padding: 10px;
        font-size: 0.85rem;
        justify-content: center;
        text-align: center;
        flex-direction: column;
        gap: 5px;
    }
    .main-content {
        padding: 10px;
    }
    header {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 10px;
    }
    .stats-grid {
        grid-template-columns: 1fr !important;
    }
    .content-grid {
        grid-template-columns: 1fr;
    }
    .table-container {
        overflow-x: auto;
    }
    table th, table td {
        white-space: nowrap;
    }
    .pos-main-grid {
        grid-template-columns: 1fr !important;
    }
    .admin-filter-bar {
        flex-direction: column;
        align-items: stretch !important;
    }
    .stat-card {
        padding: 15px;
    }
}