:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #64748b;
    --bg-main: #0f172a;
    --bg-card: #1e293b;
    --bg-hover: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --border: rgba(255, 255, 255, 0.1);
    --glass: rgba(30, 41, 59, 0.7);
    --sidebar-width: 260px;
}

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

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

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-card);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    color: var(--primary);
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: all 0.2s ease;
}

.nav-item:hover, .nav-item.active {
    background-color: var(--bg-hover);
    color: var(--text-main);
}

.nav-item.active {
    background-color: rgba(99, 102, 241, 0.15);
    color: var(--primary);
}

.nav-item i {
    width: 20px;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 2rem;
    max-width: 1400px;
}

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

.welcome-text h1 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.welcome-text p {
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.search-bar {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 300px;
}

.search-bar input {
    background: none;
    border: none;
    color: var(--text-main);
    outline: none;
    width: 100%;
}

.profile-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

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

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    padding: 1.5rem;
    border-radius: 1rem;
    transition: transform 0.2s ease;
}

.stat-card:hover {
    transform: translateY(-4px);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.stat-trend {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.trend-up { color: var(--success); }
.trend-down { color: var(--danger); }

/* Charts Area */
.charts-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-container {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    padding: 1.5rem;
    border-radius: 1rem;
    height: 400px; /* Fixed height for consistency */
    display: flex;
    flex-direction: column;
}

.chart-header {
    margin-bottom: 1.5rem;
}

.chart-header h3 {
    font-size: 1.1rem;
}

/* Recent Activity */
.activity-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    padding: 1.5rem;
    border-radius: 1rem;
}

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

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

th {
    text-align: left;
    color: var(--text-muted);
    font-weight: 500;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
}

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

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-valid { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.status-invalid { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.status-catchall { background: rgba(245, 158, 11, 0.1); color: var(--warning); }

/* Responsive */
@media (max-width: 1024px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    .main-content {
        margin-left: 0;
    }
}