:root {
    --admin-primary: #2c3e50;
    --admin-secondary: #34495e;
    --admin-accent: #3498db;
    --admin-bg: #f4f6f9;
    --admin-text: #333;
    --admin-light: #ecf0f1;
    --admin-white: #ffffff;
    --border-color: #e5e7eb;
    --text-light: #6b7280;
    --sidebar-width: 250px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--admin-bg);
    color: var(--admin-text);
}

/* Login Page */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: var(--admin-primary);
}

.login-box {
    background: var(--admin-white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--admin-primary);
}

/* Layout Admin */
.admin-wrapper {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--admin-primary);
    color: var(--admin-white);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    font-size: 1.5rem;
    font-weight: 700;
    background-color: var(--admin-secondary);
    text-align: center;
}

.sidebar-menu {
    list-style: none;
    padding: 20px 0;
}

.sidebar-menu li a {
    display: block;
    padding: 15px 20px;
    color: var(--admin-light);
    text-decoration: none;
    transition: background 0.3s;
}

.sidebar-menu li a:hover, .sidebar-menu li a.active {
    background-color: var(--admin-accent);
    color: var(--admin-white);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.topbar {
    background-color: var(--admin-white);
    height: 60px;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 0 20px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.content-wrapper {
    padding: 20px;
    flex: 1;
}

/* Cards & Forms */
.card {
    background: var(--admin-white);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 20px;
    margin-bottom: 20px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

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

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

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

/* Utils */
.btn {
    padding: 8px 16px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    font-size: 0.9rem;
}

.btn-primary { background-color: var(--admin-accent); color: white; }
.btn-danger { background-color: #e74c3c; color: white; }
.btn-secondary { background-color: #95a5a6; color: white; }

.alert {
    padding: 12px 16px;
    border-radius: 6px;
    font-size: .9rem;
}

.alert-success {
    background: #f0fdf4;
    color: #166534;
    border: 1px solid #86efac;
}

.alert-danger {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
}

@media (max-width: 900px) {
    .admin-wrapper {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
    }
    .sidebar-menu {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
        padding: 10px;
    }
}