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


body {
    font-family: system-ui, -apple-system, sans-serif;
    background: #f5f5f5;
    color: #333;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

/* navbar */

nav {
    background: #2c3e50;
    color: #fff;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: #ecf0f1;
    text-decoration: none;
    margin-left: 16px;
}

nav a:hover {
    text-decoration: underline;
}

/* head */

h1 {
    margin: 20px 0 10px;
    font-size: 1.5em;
}

hr {
    border: none;
    border-top: 1px solid #ddd;
    margin: 16px 0;
}

.text-center {
    text-align: center;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

th,
td {
    padding: 8px 12px;
    border: 1px solid #ddd;
    text-align: left;
}

th {
    background: #ecf0f1;
}

/* tombol */

.btn {
    display: inline-block;
    padding: 6px 14px;
    background: #3498db;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
}

.btn:hover {
    background: #2980b9;
}

.btn-danger {
    background: #e74c3c;
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-group {
    display: flex;
    gap: 6px;
    justify-content: center;
}

/* form */

.form-group {
    margin-bottom: 14px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 14px;
    color: #475569;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid #bbb;
    border-radius: 5px;
    font-size: 14px;
    font-family: inherit;
    color: #333;
    background: #fff;
    transition: border-color .15s, box-shadow .15s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, .15);
}

.form-group input:disabled {
    background: #eee;
    color: #999;
    cursor: not-allowed;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.radio-group {
    display: flex;
    gap: 20px;
    padding-top: 4px;
}

.radio-group label {
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.radio-group input[type="radio"] {
    accent-color: #3498db;
    width: 16px;
    height: 16px;
}

/* flash message */

.flash-message {
    padding: 12px 16px;
    border-radius: 5px;
    margin-bottom: 16px;
    font-size: 14px;
    font-weight: 500;
}

.flash-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.flash-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.flash-info {
    background: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}