/* Reset CSS Dasar */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 0 10px;
}
header h1 {
    color: #2c3e50;
    font-size: 2.2rem;
    margin-bottom: 5px;
}
header p {
    color: #7f8c8d;
    font-size: 1rem;
}

/* Layout Kontainer */
.container {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
}

.card {
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    padding: 25px;
}

/* Tab Navigasi */
.tab-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 25px;
}
.tab-btn {
    flex: 1;
    min-width: 140px; /* Mencegah tombol terlalu kecil di HP */
    padding: 12px;
    border: none;
    background: #ecf0f1;
    cursor: pointer;
    border-radius: 8px;
    font-weight: bold;
    color: #7f8c8d;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}
.tab-btn.active {
    background: #3498db;
    color: #fff;
    box-shadow: 0 4px 6px rgba(52, 152, 219, 0.3);
}

/* Bagian Form */
.form-section {
    display: none;
}
.form-section.active {
    display: block;
    animation: fadeIn 0.4s ease-in-out;
}
.form-section h2 {
    color: #2c3e50;
    margin-bottom: 5px;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #34495e;
}
.form-group input[type="file"], 
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccd1d9;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
}
.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* Tombol Eksekusi */
.action-btn {
    display: block;
    width: 100%;
    padding: 14px;
    background: #2ecc71;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    transition: 0.3s;
}
.action-btn:hover {
    opacity: 0.85;
    transform: translateY(-1px);
}

/* Pesan Alert Notifikasi */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    font-size: 0.95rem;
}
.alert-success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }
.alert a { color: #0056b3; font-weight: bold; text-decoration: underline; }

/* Footer */
footer {
    text-align: center;
    margin-top: 40px;
    color: #95a5a6;
    font-size: 0.9rem;
}

/* Animasi */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* MEDIA QUERIES (Khusus Layar HP / Mobile Responsive) */
@media screen and (max-width: 600px) {
    header h1 { font-size: 1.8rem; }
    header p { font-size: 0.9rem; }
    .card { padding: 20px 15px; }
    .tab-btn { font-size: 0.85rem; padding: 10px; }
    .form-section h2 { font-size: 1.3rem; }
    .action-btn { font-size: 1rem; padding: 12px; }
}