:root {
    --primary: #1e3a8a;
    --accent: #2563eb;
    --bg: #f3f4f6;
    --card: #ffffff;
    --text: #1f2937;
    --sidebar: #111827;
    --sidebar-text: #9ca3af;
    --danger: #dc2626;
    --success: #16a34a;
    --radius: 12px;
}

[data-theme="dark"] {
    --bg: #111827;
    --card: #1f2937;
    --text: #f3f4f6;
    --sidebar: #0f172a;
}

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

body {
    background: var(--bg);
    color: var(--text);
    display: flex;
    transition: background 0.3s;
}

/* Sidebar */
.sidebar {
    width: 260px;
    height: 100vh;
    background: var(--sidebar);
    color: white;
    position: fixed;
    left: 0;
    top: 0;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    z-index: 1000;
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 2rem;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links {
    list-style: none;
    flex: 1;
}

.nav-links li {
    margin-bottom: 0.5rem;
}

.nav-links a {
    color: var(--sidebar-text);
    text-decoration: none;
    padding: 0.8rem 1rem;
    display: flex;
    align-items: center;
    gap: 12px;
    border-radius: var(--radius);
    transition: 0.3s;
}

.nav-links a:hover, .nav-links a.active {
    background: var(--accent);
    color: white;
}

/* Main Content */
.main-content {
    margin-left: 260px;
    width: calc(100% - 260px);
    padding: 2rem;
}

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

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

.stat-card {
    background: var(--card);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: transform 0.3s;
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(37, 99, 235, 0.1);
    color: var(--accent);
}

.stat-info h3 {
    font-size: 0.875rem;
    color: #6b7280;
    margin-bottom: 0.25rem;
}

.stat-info p {
    font-size: 1.5rem;
    font-weight: bold;
}

/* Data Table */
.data-table-container {
    background: var(--card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    overflow-x: auto;
}

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

th {
    text-align: left;
    padding: 1rem;
    border-bottom: 2px solid var(--bg);
    color: #6b7280;
}

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

/* Buttons */
.btn {
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: 0.3s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary { background: var(--accent); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-success { background: var(--success); color: white; }

/* Modal (CSS Only) */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal:target {
    display: flex;
}

.modal-content {
    background: var(--card);
    padding: 2rem;
    border-radius: var(--radius);
    width: 500px;
    max-width: 90%;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
        padding: 2rem 0.5rem;
    }
    .sidebar-logo span, .nav-links a span {
        display: none;
    }
    .main-content {
        margin-left: 70px;
        width: calc(100% - 70px);
    }
}