:root {
    --primary-color: #3498db;
    --secondary-color: #95a5a6;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --bg-color: #f4f6f9;
    --white-color: #ffffff;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --success-color: #27ae60;
    --font-family: 'Sarabun', sans-serif;
    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

body { 
    font-family: var(--font-family); 
    background-color: var(--bg-color); 
    margin: 0; 
    color: #333; 
}
header { 
    background-color: var(--white-color); 
    color: var(--dark-color); 
    padding: 0.75rem 2rem; 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    border-bottom: 1px solid #e0e0e0;
}
header h1 { 
    margin: 0; 
    font-size: 1.5rem; 
    color: var(--dark-color);
    font-weight: 600;
}
.user-info { font-size: 0.9rem; }
.user-info a { color: var(--primary-color); text-decoration: none; margin-left: 1rem; font-weight: 500; }
.user-info a:hover { text-decoration: underline; }

.app-container {
    display: flex;
    height: calc(100vh - 65px); /* Adjust to your header's actual height */
}

.sidebar {
    width: 250px;
    background-color: var(--dark-color);
    color: var(--light-color);
    padding: 1rem 0.75rem;
    overflow-y: auto;
    transition: width 0.3s ease;
}
.sidebar nav ul { list-style: none; padding: 0; margin: 0; }
.sidebar nav ul li a { 
    display: block; 
    padding: 0.8rem 1rem; 
    text-decoration: none; 
    color: var(--light-color); 
    border-radius: var(--border-radius); 
    margin-bottom: 0.25rem; 
    transition: background-color 0.2s ease, color 0.2s ease;
}
.sidebar nav ul li a:hover { 
    background-color: rgba(255, 255, 255, 0.1); 
}
.sidebar nav ul li a.active { 
    background-color: var(--primary-color); 
    color: var(--white-color);
    font-weight: 600; 
}

.main-content { flex-grow: 1; padding: 2rem; overflow-y: auto; min-width: 0; }
footer { text-align: center; padding: 1rem; background-color: var(--white-color); color: #777; font-size: 0.9rem; border-top: 1px solid #e0e0e0;}

/* Login Form */
.login-container { max-width: 400px; margin: 5rem auto; padding: 2rem; background: white; border-radius: 8px; box-shadow: 0 4px 8px rgba(0,0,0,0.1); text-align: center; }
.form-group { margin-bottom: 1rem; text-align: left; }
.form-group label { display: block; margin-bottom: 0.5rem; }
.form-group input, .form-group select { width: 100%; padding: 0.75rem; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; }
button { width: 100%; padding: 0.75rem; background-color: var(--primary-color); color: white; border: none; border-radius: 4px; cursor: pointer; font-size: 1rem; font-family: var(--font-family); }
button:hover { background-color: #2980b9; }
.error { color: #721c24; background-color: #f8d7da; border: 1px solid #f5c6cb; padding: 0.75rem; border-radius: 4px; margin-bottom: 1rem; }

/* Table */
table { 
    width: 100%; 
    border-collapse: collapse; 
    margin-top: 1.5rem; 
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}
th, td { 
    padding: 1rem; 
    border-bottom: 1px solid var(--light-color); 
    text-align: left; 
}
th { 
    background-color: #f8f9fa; 
    font-weight: 600;
    color: #34495e;
}
tr:last-child td {
    border-bottom: none;
}
tr:hover {
    background-color: #fdfdfd;
}

/* --- เพิ่มเติมสำหรับหน้า CRUD --- */
.toolbar {
    margin-bottom: 1rem;
}
.button-primary, .button-secondary, .button-edit, .button-delete {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
    text-decoration: none;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    font-family: var(--font-family);
    transition: background-color 0.2s ease, transform 0.1s ease;
    font-weight: 500;
}
.button-primary:hover, .button-secondary:hover, .button-edit:hover, .button-delete:hover {
    transform: translateY(-1px);
}
.button-primary { background-color: var(--primary-color); color: white; }
.button-primary:hover { background-color: #2980b9; }

.button-secondary { background-color: var(--secondary-color); color: white; }
.button-secondary:hover { background-color: #7f8c8d; }

.button-edit { background-color: var(--warning-color); color: var(--dark-color); }
.button-edit:hover { background-color: #d4ac0d; }

.button-delete { background-color: var(--danger-color); color: white; }
.button-delete:hover { background-color: #c0392b; }

.form-layout {
    background-color: var(--white-color);
    padding: 1.5rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}
.form-layout .form-group {
    margin-bottom: 1rem;
}
.form-layout .form-actions {
    margin-top: 1.5rem;
}
.success {
    color: #145A32;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    padding: 0.75rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}
.csv-import-form {
    display: inline-block;
    margin-left: 1rem;
    padding: 0.5rem;
    border: 1px solid #ddd;
    background-color: #f8f9fa;
    border-radius: 4px;
}
.score-input { width: 80px; padding: 0.25rem; }
.active-row {
    background-color: #d4edda !important;
    font-weight: bold;
}
.table-responsive-wrapper {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.sidebar .menu-header {
    padding: 1.5rem 1rem 0.5rem;
    font-size: 0.75rem;
    color: #7f8c8d;
    text-transform: uppercase;
    font-weight: bold;
    letter-spacing: 0.05em;
}
@media print {
    .transcript-container:last-child { page-break-after: auto; }
}