/* ===================================
   ระบบเช็คชื่อนักเรียน - CSS Stylesheet
   ธีมสี: ฟ้า-น้ำเงิน (สถาบันการศึกษา)
   =================================== */

/* === CSS Variables === */
:root {
    /* Primary Colors - Blue Theme */
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-lighter: #dbeafe;
    
    /* Secondary Colors */
    --secondary-color: #0891b2;
    --secondary-dark: #0e7490;
    
    /* Status Colors */
    --success-color: #10b981;
    --success-light: #d1fae5;
    --danger-color: #ef4444;
    --danger-light: #fee2e2;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --info-color: #06b6d4;
    --info-light: #cffafe;
    --purple-color: #8b5cf6;
    --purple-light: #ede9fe;
    
    /* Attendance Status Colors */
    --present-color: #10b981;
    --absent-color: #ef4444;
    --late-color: #f59e0b;
    --leave-color: #06b6d4;
    --sick-color: #ec4899;
    
    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Layout */
    --sidebar-width: 280px;
    --header-height: 70px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* === Global Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Prompt', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--gray-800);
    line-height: 1.6;
    overflow-x: hidden;
}

/* === Sidebar === */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: white;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.sidebar-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 600;
}

.logo i {
    font-size: 1.75rem;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    display: none;
    transition: var(--transition);
}

.sidebar-toggle:hover {
    transform: rotate(90deg);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-section-title {
    padding: 0.5rem 1.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    color: var(--gray-700);
    text-decoration: none;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--gray-100);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.nav-item.active {
    background: var(--primary-lighter);
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    font-weight: 600;
}

.nav-item i {
    font-size: 1.25rem;
    width: 1.5rem;
    text-align: center;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--gray-200);
    text-align: center;
    font-size: 0.75rem;
    color: var(--gray-500);
}

/* === Mobile Menu Toggle === */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 999;
    background: var(--primary-color);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.mobile-menu-toggle:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

/* === Main Content === */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: 2rem;
    transition: var(--transition);
}

/* === Page === */
.page {
    display: none;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.page-header {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header h1 {
    font-size: 2rem;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--gray-600);
    margin-top: 0.25rem;
}

/* === Stats Grid === */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 70px;
    height: 70px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.stat-primary .stat-icon {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
}

.stat-success .stat-icon {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
}

.stat-info .stat-icon {
    background: linear-gradient(135deg, var(--info-color) 0%, #22d3ee 100%);
}

.stat-warning .stat-icon {
    background: linear-gradient(135deg, var(--warning-color) 0%, #fbbf24 100%);
}

.stat-danger .stat-icon {
    background: linear-gradient(135deg, var(--danger-color) 0%, #f87171 100%);
}

.stat-purple .stat-icon {
    background: linear-gradient(135deg, var(--purple-color) 0%, #a78bfa 100%);
}

.stat-info h3 {
    font-size: 2rem;
    color: var(--gray-800);
    margin-bottom: 0.25rem;
}

.stat-info p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* === Charts Grid === */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.chart-card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.chart-card h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chart-card canvas {
    max-height: 300px;
}

/* === Search Bar === */
.search-bar {
    position: relative;
    margin-bottom: 1.5rem;
}

.search-bar input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 3rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
}

.search-bar input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-lighter);
}

.search-bar i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 1.125rem;
}

/* === Filter Bar === */
.filter-bar {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.filter-bar .search-bar {
    flex: 1;
    min-width: 250px;
    margin-bottom: 0;
}

.filter-select {
    padding: 0.875rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    background: white;
    font-size: 1rem;
    color: var(--gray-700);
    cursor: pointer;
    transition: var(--transition);
    min-width: 200px;
}

.filter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-lighter);
}

/* === Table === */
.table-container {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.data-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table tbody tr {
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

.data-table td {
    padding: 1rem;
    color: var(--gray-700);
}

.data-table tbody tr:last-child {
    border-bottom: none;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: 'Prompt', sans-serif;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-success:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-warning:hover {
    background: #d97706;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--gray-500);
    color: white;
}

.btn-secondary:hover {
    background: var(--gray-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-icon {
    width: 35px;
    height: 35px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

/* === Badges === */
.badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-present {
    background: var(--success-light);
    color: var(--success-color);
}

.badge-absent {
    background: var(--danger-light);
    color: var(--danger-color);
}

.badge-late {
    background: var(--warning-light);
    color: var(--warning-color);
}

.badge-leave {
    background: var(--info-light);
    color: var(--info-color);
}

.badge-sick {
    background: #fce7f3;
    color: var(--sick-color);
}

.badge-success {
    background: var(--success-light);
    color: var(--success-color);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning-color);
}

.badge-info {
    background: var(--info-light);
    color: var(--info-color);
}

.badge-active {
    background: var(--success-light);
    color: var(--success-color);
}

.badge-inactive {
    background: var(--gray-100);
    color: var(--gray-600);
}

/* === Modal === */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.modal-body {
    padding: 2rem;
    overflow-y: auto;
    flex: 1;
}

/* === Forms === */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--gray-700);
    font-weight: 500;
}

.form-group .required {
    color: var(--danger-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: 'Prompt', sans-serif;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-lighter);
}

.form-control:disabled {
    background: var(--gray-100);
    cursor: not-allowed;
}

.form-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 200px;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

/* === Toast Notification === */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: white;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    z-index: 3000;
    display: none;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.show {
    display: flex;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--danger-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast.info {
    border-left: 4px solid var(--info-color);
}

/* === Attendance Page === */
.attendance-filters {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.attendance-sheet {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.attendance-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.attendance-header h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.attendance-legend {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.attendance-table select {
    padding: 0.5rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
}

.attendance-table select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.attendance-table input[type="text"] {
    width: 100%;
    padding: 0.5rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: 0.875rem;
}

.attendance-table input[type="text"]:focus {
    outline: none;
    border-color: var(--primary-color);
}

.attendance-actions {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* === Report Page === */
.report-filters {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.report-content {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
}

.report-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.report-header h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.report-header p {
    color: var(--gray-600);
}

.report-section {
    margin-bottom: 2rem;
}

.report-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.report-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.report-stat {
    background: var(--gray-50);
    padding: 1rem;
    border-radius: var(--border-radius);
    text-align: center;
    border-left: 4px solid var(--primary-color);
}

.report-stat h4 {
    font-size: 1.75rem;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.report-stat p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.report-group {
    margin-bottom: 2rem;
}

.report-group h4 {
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
    font-size: 1.125rem;
}

.report-group.pass h4 {
    background: var(--success-light);
    color: var(--success-color);
}

.report-group.fail h4 {
    background: var(--danger-light);
    color: var(--danger-color);
}

.report-actions {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* === Empty State === */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--gray-500);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    margin-bottom: 0.5rem;
    color: var(--gray-600);
}

/* === Loading State === */
.loading {
    text-align: center;
    padding: 2rem;
}

.loading i {
    font-size: 2rem;
    color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* === Responsive Design === */
@media (max-width: 1024px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .sidebar-toggle {
        display: block;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-content {
        margin-left: 0;
        padding: 1rem;
        padding-top: 5rem;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .page-header h1 {
        font-size: 1.5rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-bar {
        flex-direction: column;
    }
    
    .filter-bar .search-bar,
    .filter-select {
        width: 100%;
    }
    
    .form-row {
        flex-direction: column;
    }
    
    .form-row .form-group {
        width: 100%;
    }
    
    .table-container {
        overflow-x: auto;
    }
    
    .data-table {
        min-width: 800px;
    }
    
    .modal {
        width: 95%;
        max-height: 95vh;
    }
    
    .toast {
        bottom: 1rem;
        right: 1rem;
        min-width: auto;
        width: calc(100% - 2rem);
    }
    
    .report-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 1.25rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .stat-card {
        flex-direction: column;
        text-align: center;
    }
}

/* === Print Styles === */
@media print {
    .sidebar,
    .mobile-menu-toggle,
    .page-header button,
    .search-bar,
    .filter-bar,
    .btn,
    .report-actions {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .page {
        display: block !important;
    }
    
    .report-content {
        box-shadow: none;
        padding: 0;
    }
}

/* === Utilities === */
.text-center {
    text-align: center;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }