:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --primary: #6366f1;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #22c55e;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 6px;
    cursor: pointer;
}

.btn-secondary {
    background: white;
    border: 1px solid var(--border);
    padding: 10px 15px;
    border-radius: 6px;
    cursor: pointer;
}

/* Overview Cards */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.card h4 {
    color: var(--text-muted);
    margin: 0;
    font-size: 0.9rem;
}

.card .value {
    font-size: 1.8rem;
    font-weight: bold;
    margin: 10px 0;
}

.card .trend {
    color: var(--success);
    font-size: 0.85rem;
    font-weight: 600;
}

/* Tabs */
.tabs {
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 8px;
    font-weight: 500;
    color: var(--text-muted);
    transition: 0.3s;
}

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

/* Table */
.main-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 20px;
    margin-top: 30px;
}

.table-card,
.insights-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

th {
    text-align: left;
    padding: 12px;
    border-bottom: 2px solid var(--border);
    color: var(--text-muted);
}

td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

tr:hover {
    background: #f1f5f9;
}


/* Responsive adjustments */
@media (max-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
}