:root {
    --primary-color: #4F46E5; /* Indigo */
    --secondary-color: #818CF8;
    --bg-color: #F3F4F6;
    --sidebar-bg: #111827;
    --text-dark: #1F2937;
    --text-light: #F9FAFB;
    --danger-color: #EF4444;
    --success-color: #10B981;
}

body {
    margin: 0;
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-dark);
}

/* --- Dashboard Layout --- */
.dashboard-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* --- Sidebar --- */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    padding-top: 20px;
    transition: width 0.3s ease;
}

    .sidebar h2 {
        text-align: center;
        font-weight: 700;
        margin-bottom: 30px;
        letter-spacing: 1px;
    }

.nav-link {
    padding: 15px 25px;
    color: #9CA3AF;
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s;
}

    .nav-link:hover, .nav-link.active {
        background-color: var(--primary-color);
        color: white;
        border-left: 4px solid white;
    }

/* --- Main Content Area --- */
.main-content {
    flex: 1;
    padding: 40px;
    overflow-y: auto;
}

/* --- Cards & Forms --- */
.card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 15px;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #D1D5DB;
    border-radius: 8px;
    font-size: 14px;
    box-sizing: border-box;
}

    .form-control:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
    }

/* --- Tables --- */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

    .data-table th, .data-table td {
        padding: 12px 15px;
        text-align: left;
        border-bottom: 1px solid #E5E7EB;
    }

    .data-table th {
        background-color: #F9FAFB;
        font-weight: 600;
        color: #4B5563;
    }

    .data-table tbody tr:hover {
        background-color: #F3F4F6;
    }

/* --- Buttons --- */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s;
}

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

    .btn-primary:hover {
        background-color: #4338CA;
    }

.btn-danger {
    background-color: var(--danger-color);
    color: white;
    padding: 6px 12px;
    font-size: 12px;
}

    .btn-danger:hover {
        background-color: #DC2626;
    }

.btn-edit {
    background-color: #F59E0B;
    color: white;
    padding: 6px 12px;
    font-size: 12px;
    margin-right: 5px;
}