:root {
    --primary-color: #1a3e8c;
    --secondary-color: #f8f9fa;
    --accent-color: #e9ecef;
    --text-color: #212529;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Sarabun', sans-serif;
}

body {
    background-color: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 20px 0;
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
}

header p {
    font-size: 1.2rem;
    font-weight: 400;
}

section {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 25px;
    margin-bottom: 30px;
}

h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.8rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
}

h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.4rem;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

select, input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 1rem;
}

input[readonly] {
    background-color: var(--accent-color);
    border-color: #dee2e6;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0d2b6b;
}

button:disabled {
    background-color: #adb5bd;
    cursor: not-allowed;
}

.status-available {
    background-color: #d4edda;
    color: #155724;
}

.status-reserved {
    background-color: #fff3cd;
    color: #856404;
}

.status-suspended {
    background-color: #f8d7da;
    color: #721c24;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
}

tr:nth-child(even) {
    background-color: var(--accent-color);
}

footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
}

/* Admin specific styles */
.admin-section {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 25px;
    margin-bottom: 30px;
}

.admin-tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 1px solid #ddd;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 20px;
    background: #f1f1f1;
    border: none;
    cursor: pointer;
    margin-right: 5px;
    border-radius: 5px 5px 0 0;
    transition: all 0.3s;
}

.tab-btn:hover {
    background: #ddd;
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.logout-btn {
    margin-left: auto;
    background-color: var(--danger-color);
}

.tab-content {
    display: none;
    padding: 20px;
    border: 1px solid #ddd;
    border-top: none;
    border-radius: 0 0 8px 8px;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

.form-row {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
}

.form-row .form-group {
    flex: 1;
}

.admin-actions {
    margin: 20px 0;
    display: flex;
    gap: 10px;
}

.btn-edit, 
.btn-delete, 
.btn-edit-person, 
.btn-delete-person {
    padding: 5px 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.btn-edit, 
.btn-edit-person {
    background-color: var(--success-color);
    color: white;
}

.btn-edit:hover, 
.btn-edit-person:hover {
    background-color: #218838;
}

.btn-delete, 
.btn-delete-person {
    background-color: var(--danger-color);
    color: white;
}

.btn-delete:hover, 
.btn-delete-person:hover {
    background-color: #c82333;
}

.no-data {
    text-align: center;
    color: #666;
    padding: 20px;
}

/* Loading spinner */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    section {
        padding: 15px;
    }
    
    th, td {
        padding: 8px 10px;
        font-size: 0.9rem;
    }
    
    .form-row {
        flex-direction: column;
        gap: 10px;
    }
    
    .tab-btn {
        margin-bottom: 5px;
    }
    
    button {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
}