:root {
    --primary-color: #4A90E2;
    --primary-hover: #357ABD;
    --secondary-color: #50E3C2;
    --background-color: #F5F7FA;
    --surface-color: #FFFFFF;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-on-primary: #FFFFFF;
    --border-color: #EAEAEA;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --font-family: 'Be Vietnam Pro', sans-serif;
}

body.dark-mode {
    --primary-color: #50E3C2;
    --primary-hover: #38a189;
    --secondary-color: #4A90E2;
    --background-color: #121212;
    --surface-color: #1E1E1E;
    --text-primary: #E0E0E0;
    --text-secondary: #A0A0A0;
    --text-on-primary: #121212;
    --border-color: #333333;
    --shadow-color: rgba(255, 255, 255, 0.08);
}

/* Reset và Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--surface-color);
    border-radius: 12px;
    box-shadow: 0 10px 30px var(--shadow-color);
    overflow: hidden;
    transition: background-color 0.3s;
}

/* Header */
h1 {
    background: var(--primary-color);
    color: var(--text-on-primary);
    text-align: center;
    padding: 30px 20px;
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    border-bottom: 1px solid transparent;
    transition: background-color 0.3s, color 0.3s;
}

/* Content Area */
.content-area {
    padding: 30px;
}

/* Search Form */
.search-form {
    margin-bottom: 30px;
    display: flex;
    gap: 0;
    box-shadow: 0 4px 15px var(--shadow-color);
    border-radius: 25px;
    overflow: hidden;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.search-form input[type="text"] {
    flex: 1;
    padding: 15px 20px;
    border: none;
    font-size: 1rem;
    outline: none;
    background: var(--background-color);
    color: var(--text-primary);
    transition: background-color 0.3s, color 0.3s;
}

.search-form input[type="text"]:focus {
    background: var(--surface-color);
    box-shadow: inset 0 0 0 2px var(--primary-color);
}

.search-form button {
    padding: 15px 25px;
    border: none;
    background: var(--primary-color);
    color: white;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    min-width: 100px;
}

.search-form button:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0, 0.2);
}

/* Table Container */
.table-container {
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--shadow-color);
    margin-bottom: 20px;
}

/* Table Styles */
.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface-color);
    min-width: 800px;
}

.table th {
    background: var(--background-color);
    padding: 18px 15px;
    font-weight: 600;
    text-align: left;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.95rem;
    white-space: nowrap;
}

.table td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    vertical-align: top;
    font-size: 0.9rem;
}

.table tbody tr {
    transition: all 0.3s ease;
}

.table tbody tr:hover {
    background-color: var(--background-color);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px var(--shadow-color);
}

/* Toggle Button */
.toggle-btn {
    padding: 8px 16px;
    border: none;
    background: var(--success-color);
    color: white;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(40, 167, 69, 0.2);
}

.toggle-btn:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

/* Xa Details Row */
.xa-details td {
    background: var(--background-color);
    padding: 20px !important;
    border-top: 2px solid var(--primary-color);
}

.list-xa {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 8px;
}

.list-xa li {
    background: var(--surface-color);
    padding: 8px 12px;
    border-radius: 6px;
    border-left: 3px solid var(--primary-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.list-xa li:hover {
    transform: translateX(5px);
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}

/* Alert Styles */
.alert {
    padding: 20px;
    margin: 20px 0;
    border-radius: 8px;
    font-size: 1rem;
    text-align: center;
}

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

body.dark-mode .alert-danger {
    background-color: #2c1d20;
    color: #f8d7da;
    border-color: #582c33;
}

/* Admin CRUD Styles */
.wrapper {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px var(--shadow-color);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

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

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

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

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

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s ease;
    background: var(--background-color);
    color: var(--text-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--surface-color);
    box-shadow: 0 0 0 3px var(--primary-color-translucent, rgba(74, 144, 226, 0.25));
}

.form-control.is-invalid {
    border-color: var(--danger-color);
    background: #fff5f5;
}

body.dark-mode .form-control.is-invalid {
    background: #2c1d20;
}

.invalid-feedback {
    display: block;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 5px;
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

/* Utility Classes */
.pull-left { float: left; }
.pull-right { float: right; }
.mt-5 { margin-top: 3rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mr-3 { margin-right: 1rem; }
.ml-2 { margin-left: 0.5rem; }
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}

/* Theme Switcher */
.site-header {
    display: flex;
    justify-content: flex-end;
    padding: 10px 20px;
    background-color: var(--background-color);
    transition: background-color 0.3s;
}

.theme-switcher {
    position: relative;
}

.theme-toggle-checkbox {
    display: none;
}

.theme-toggle-label {
    display: block;
    width: 50px;
    height: 26px;
    background-color: #ccc;
    border-radius: 13px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
    position: relative;
}

.theme-toggle-label::after {
    content: '';
    display: block;
    width: 22px;
    height: 22px;
    background-color: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: transform 0.2s ease-in-out;
}

.theme-toggle-checkbox:checked + .theme-toggle-label {
    background-color: var(--primary-color);
}

.theme-toggle-checkbox:checked + .theme-toggle-label::after {
    transform: translateX(24px);
}

.theme-toggle-label .sun,
.theme-toggle-label .moon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
}

.theme-toggle-label .sun {
    left: 5px;
    color: #f39c12;
}

.theme-toggle-label .moon {
    right: 5px;
    color: #f1c40f;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    body { padding: 10px; }
    h1 { font-size: 1.4rem; padding: 20px 15px; }
    .content-area { padding: 20px 15px; }
    .search-form { flex-direction: column; border-radius: 12px; max-width: none; }
    .search-form input[type="text"] { border-radius: 12px 12px 0 0; padding: 12px 15px; }
    .search-form button { border-radius: 0 0 12px 12px; padding: 12px 15px; }
    .table-container { margin: 0 -15px; border-radius: 0; }
    .table { min-width: 600px; }
    .table th, .table td { padding: 10px 8px; font-size: 0.8rem; }
    .table th { position: sticky; top: 0; z-index: 10; }
    .toggle-btn { padding: 6px 12px; font-size: 0.75rem; }
    .list-xa { grid-template-columns: 1fr; gap: 5px; }
    .list-xa li { font-size: 0.8rem; padding: 6px 10px; }
    .xa-details td { padding: 15px 10px !important; }
    .wrapper { padding: 15px; }
    .pull-right, .pull-left { float: none; display: block; width: 100%; margin-bottom: 10px; }
    .btn { width: 100%; margin-bottom: 10px; }
    .mr-3, .ml-2 { margin-left: 0; margin-right: 0; }
}

@media screen and (max-width: 480px) {
    h1 { font-size: 1.2rem; padding: 15px 10px; }
    .content-area { padding: 15px 10px; }
    .table th, .table td { padding: 8px 5px; font-size: 0.75rem; }
    .search-form input[type="text"], .search-form button { padding: 10px 12px; }
}

/* Print styles */
@media print {
    :root {
        --background-color: #FFFFFF;
        --surface-color: #FFFFFF;
        --text-primary: #000000;
        --text-secondary: #333333;
        --border-color: #CCCCCC;
    }
    body { background: white !important; color: black !important; }
    .search-form, .toggle-btn, .site-header { display: none !important; }
    .xa-details { display: table-row !important; }
    .table { border-collapse: collapse; }
    .table th, .table td { border: 1px solid #000 !important; padding: 8px !important; }
    .container { box-shadow: none !important; border: 1px solid #000; }
}