:root {
    --primary-color: #2563eb;
    --sidebar-bg: #1e293b;
    --sidebar-text: #f8fafc;
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-color: #334155;
    --border-color: #e2e8f0;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
}

.admin-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 1.5rem 1rem;
    display: flex;
    flex-direction: column;
}

.sidebar h2 {
    margin-top: 0;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    text-align: center;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sidebar a {
    color: var(--sidebar-text);
    text-decoration: none;
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    transition: background-color 0.2s;
}

.sidebar a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.sidebar a.active {
    background-color: var(--primary-color);
}

.main-content {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

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

.header h1 {
    margin: 0;
}

.card {
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

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

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f8fafc;
    font-weight: 600;
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    cursor: pointer;
    font-size: 0.875rem;
}

.btn:hover {
    opacity: 0.9;
}

.btn-danger {
    background-color: #ef4444;
}

.modal {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 0.5rem;
    width: 100%;
    max-width: 500px;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    box-sizing: border-box;
}

#login-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: white;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}