body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    color: #333;
}

/* --- Halaman Login --- */
.login-container {
    width: 320px;
    margin: 100px auto;
    padding: 30px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}
.login-container h2 {
    text-align: center;
    color: #2c3e50;
    margin-top: 0;
}
.login-container .error {
    background-color: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
    text-align: center;
}
.login-container div {
    margin-bottom: 15px;
}
.login-container label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}
.login-container input[type="text"],
.login-container input[type="password"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box; 
}
.login-container button {
    width: 100%;
    padding: 12px;
    background-color: #3498db;
    border: none;
    color: white;
    font-size: 16px;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
}
.login-container button:hover {
    background-color: #2980b9;
}

/* --- Global Header & Main --- */
header {
    background-color: #2c3e50;
    color: white;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
header h1 {
    margin: 0;
    font-size: 24px;
}
header .user-info {
    font-size: 14px;
}
header .user-info a {
    color: #ecf0f1;
    text-decoration: none;
    background-color: #34495e;
    padding: 5px 10px;
    border-radius: 4px;
    margin-left: 10px;
    transition: background-color 0.3s;
}
header .user-info a:last-child { /* Khusus tombol logout */
    background-color: #e74c3c;
}
header .user-info a:hover {
    background-color: #1e2b37;
}
header .user-info a:last-child:hover {
    background-color: #c0392b;
}

main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}

.filter-card, .content-card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    padding: 20px;
    margin-bottom: 20px;
}

.filter-card h3, .content-card h3 {
    margin-top: 0;
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 10px;
}

/* --- Filter Form (Dashboard) --- */
.filter-card form {
    display: flex;
    gap: 20px;
    align-items: flex-end;
}
.form-group {
    flex: 1;
}
.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}
.form-group input, .form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}
.filter-card button {
    padding: 10px 20px;
    background-color: #2ecc71;
    border: none;
    color: white;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    height: 40px; 
}
.filter-card button:hover {
    background-color: #27ae60;
}

/* --- Tabel Data --- */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    font-size: 14px;
}
table th, table td {
    border: 1px solid #ecf0f1;
    padding: 12px 15px;
    text-align: left;
}
table th {
    background-color: #f9fbfd;
    font-weight: 600;
}
table tr:nth-child(even) {
    background-color: #fdfdfd;
}
.btn-detail {
    background-color: #3498db;
    color: white;
    padding: 5px 10px;
    text-decoration: none;
    border-radius: 4px;
    font-size: 12px;
}
.btn-detail:hover {
    background-color: #2980b9;
}

/* --- Halaman Detail --- */
.detail-container {
    max-width: 800px;
    margin: 20px auto;
}
.detail-section {
    margin-top: 20px;
}
.detail-media {
    margin-top: 15px;
    background-color: #f9f9f9;
    padding: 15px;
    border-radius: 6px;
}
.detail-media img {
    max-width: 100%;
    height: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    margin-top: 5px;
    max-height: 400px;
    display: block;
}
.detail-media a {
    color: #3498db;
    text-decoration: none;
    font-weight: 600;
}
.detail-media a:hover {
    text-decoration: underline;
}

/* --- CRUD Siswa Styles --- */
.success { background-color: #d4edda; color: #155724; padding: 10px; border: 1px solid #c3e6cb; border-radius: 4px; margin-bottom: 15px; }
.error { background-color: #f8d7da; color: #721c24; padding: 10px; border: 1px solid #f5c6cb; border-radius: 4px; margin-bottom: 15px; }
.btn-add { display: inline-block; padding: 10px 15px; background-color: #2ecc71; color: white; text-decoration: none; border-radius: 4px; margin-bottom: 20px; }
.btn-edit { background-color: #f39c12; color: white; padding: 5px 10px; text-decoration: none; border-radius: 4px; font-size: 12px; margin-right: 5px; }
.btn-delete { background-color: #e74c3c; color: white; padding: 5px 10px; text-decoration: none; border-radius: 4px; font-size: 12px; }

/* CRUD Form */
.form-container { max-width: 600px; margin: 20px auto; }
.form-container h3 { margin-top: 25px; border-bottom: 1px dashed #ddd; padding-bottom: 8px; color: #3498db; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 600; }
.form-group input { width: 100%; padding: 10px; border: 1px solid #ddd; border-radius: 4px; box-sizing: border-box; }
.btn-save { padding: 12px 20px; background-color: #3498db; border: none; color: white; font-size: 16px; font-weight: 600; border-radius: 4px; cursor: pointer; width: 100%; margin-top: 20px; }
.btn-save:hover { background-color: #2980b9; }