/* ===== HYBRID MODERN APP STYLES - MOBILE FIRST ===== */
        
        /* Root Variables for Modern Theming */
        :root {
            --primary-color: #28a745;
            --primary-dark: #218838;
            --primary-light: #20c997;
            --secondary-color: #667eea;
            --secondary-dark: #764ba2;
            --danger-color: #dc3545;
            --success-color: #28a745;
            --info-color: #17a2b8;
            --warning-color: #ffc107;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --border-radius: 16px;
            --border-radius-sm: 12px;
            --border-radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --safe-area-top: env(safe-area-inset-top, 0px);
            --safe-area-bottom: env(safe-area-inset-bottom, 0px);
        }

        /* Reset & Base Styles */
        * {
            -webkit-tap-highlight-color: transparent;
            box-sizing: border-box;
        }

        body {
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--secondary-dark) 100%);
            background-attachment: fixed;
            min-height: 100vh;
            min-height: -webkit-fill-available;
            min-height: calc(100vh - var(--safe-area-top) - var(--safe-area-bottom));
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
            padding: var(--safe-area-top) 0 var(--safe-area-bottom) 0;
            margin: 0;
            overflow-x: hidden;
        }
        
        @supports (height: 100dvh) {
            body {
                min-height: 100dvh;
            }
        }

        /* Container Styles - Mobile First */
        .container {
            width: 100%;
            max-width: 100%;
            padding: 12px;
            margin: 0 auto;
        }

        @media (min-width: 576px) {
            .container {
                padding: 16px;
            }
        }

        @media (min-width: 768px) {
            .container {
                padding: 24px;
                max-width: 800px;
            }
        }

        @media (min-width: 992px) {
            .container {
                padding: 32px;
                max-width: 900px;
            }
        }

        @media (min-width: 1200px) {
            .container {
                padding: 40px;
                max-width: 1000px;
            }
        }

        /* Registration Container - Card Style */
        .registration-container {
            background: #ffffff;
            border-radius: var(--border-radius-lg);
            box-shadow: var(--shadow-lg);
            margin: 0 auto;
            max-width: 100%;
            overflow: hidden;
            animation: slideUp 0.4s ease-out;
            position: relative;
            will-change: transform;
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translate3d(0, 20px, 0);
            }
            to {
                opacity: 1;
                transform: translate3d(0, 0, 0);
            }
        }

        /* Header Section - Modern App Header */
        .header-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
            color: white;
            padding: 20px 16px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .header-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
            animation: pulse 3s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { transform: scale(1); opacity: 0.5; }
            50% { transform: scale(1.1); opacity: 0.8; }
        }

        .header-section h2 {
            margin: 0 0 8px 0;
            font-size: 20px;
            font-weight: 700;
            position: relative;
            z-index: 1;
        }

        .header-section p {
            margin: 0;
            font-size: 14px;
            opacity: 0.95;
            position: relative;
            z-index: 1;
        }

        @media (min-width: 768px) {
            .header-section {
                padding: 24px 20px;
            }
            .header-section h2 {
                font-size: 24px;
            }
            .header-section p {
                font-size: 16px;
            }
        }

        /* Form Section */
        .form-section {
            padding: 20px 16px;
        }

        @media (min-width: 768px) {
            .form-section {
                padding: 32px 24px;
            }
        }

        /* Form Labels */
        .form-label {
            font-weight: 600;
            font-size: 14px;
            color: var(--dark-text);
            margin-bottom: 8px;
            display: block;
        }

        @media (min-width: 768px) {
            .form-label {
                font-size: 15px;
            }
        }

        .required-field {
            color: var(--danger-color);
            font-weight: 700;
        }

        /* Form Controls - Touch Friendly */
        .form-control {
            border: 2px solid #e0e0e0;
            border-radius: var(--border-radius-sm);
            padding: 14px 16px;
            font-size: 16px; /* Prevents zoom on iOS */
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
            background: #ffffff;
            min-height: 48px; /* Touch target size */
            width: 100%;
            -webkit-appearance: none;
            appearance: none;
        }

        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 4px rgba(40, 167, 69, 0.1);
            outline: none;
        }

        .form-control::placeholder {
            color: #9e9e9e;
            opacity: 0.7;
        }

        textarea.form-control {
            min-height: 100px;
            resize: vertical;
        }
        
        /* Reason Keywords Container */
        .reason-keywords-container {
            width: 100%;
            overflow-x: auto;
            overflow-y: hidden;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: rgba(0,0,0,0.2) transparent;
        }
        
        .reason-keywords-container::-webkit-scrollbar {
            height: 4px;
        }
        
        .reason-keywords-container::-webkit-scrollbar-track {
            background: transparent;
        }
        
        .reason-keywords-container::-webkit-scrollbar-thumb {
            background: rgba(0,0,0,0.2);
            border-radius: 2px;
        }
        
        .reason-keywords-scroll {
            display: flex;
            flex-wrap: nowrap;
            gap: 6px;
            padding: 2px 0;
            white-space: nowrap;
        }
        
        .reason-keyword-btn {
            display: inline-flex;
            align-items: center;
            padding: 6px 12px;
            font-size: 12px;
            font-weight: 500;
            color: var(--primary-color);
            background: #ffffff;
            border: 1.5px solid var(--primary-color);
            border-radius: 16px;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
            flex-shrink: 0;
            min-height: 28px;
            line-height: 1.2;
        }
        
        .reason-keyword-btn:hover {
            background: var(--primary-color);
            color: #ffffff;
            transform: translateY(-1px);
            box-shadow: 0 2px 6px rgba(40, 167, 69, 0.3);
        }
        
        .reason-keyword-btn:active {
            transform: translateY(0);
            box-shadow: 0 1px 3px rgba(40, 167, 69, 0.2);
        }
        
        @media (min-width: 768px) {
            .reason-keyword-btn {
                font-size: 13px;
                padding: 7px 14px;
                min-height: 32px;
            }
        }
        
        input[type="date"].form-control {
            position: relative;
        }
        
        input[type="date"].form-control::-webkit-calendar-picker-indicator {
            cursor: pointer;
            opacity: 0.7;
        }

        /* Capitalize Fields */
        .capitalize-field {
            text-transform: uppercase;
        }

        /* Section Titles */
        .section-title {
            font-weight: 700;
            font-size: 18px;
            color: var(--primary-color);
            margin: 32px 0 20px 0;
            padding-bottom: 12px;
            border-bottom: 3px solid #e9ecef;
            position: relative;
        }

        .section-title:first-child {
            margin-top: 0;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--primary-color);
            border-radius: 2px;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 20px;
            }
        }

        /* Section title with button */
        .section-title.d-flex {
            border-bottom: 3px solid #e9ecef;
        }

        .section-title.d-flex::after {
            width: 60px;
        }

        .section-title .btn-sm {
            font-size: 12px;
            padding: 4px 12px;
            white-space: nowrap;
            margin-left: 12px;
            flex-shrink: 0;
        }

        @media (min-width: 768px) {
            .section-title .btn-sm {
                font-size: 13px;
                padding: 6px 14px;
            }
        }

        @media (max-width: 575px) {
            .section-title .btn-sm {
                font-size: 11px;
                padding: 4px 8px;
            }
            
            .section-title .btn-sm span {
                display: none;
            }
        }

        /* Quick Links - Tối ưu cho mobile và desktop */
        .quick-links {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: var(--border-radius);
            padding: 12px;
            border: 1px solid #dee2e6;
            margin-bottom: 16px;
        }

        @media (min-width: 768px) {
            .quick-links {
                padding: 16px;
                margin-bottom: 8px;
            }
        }

        @media (min-width: 992px) {
            .quick-links {
                padding: 20px;
            }
        }

        .quick-links-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 8px;
            width: 100%;
        }

        @media (min-width: 576px) {
            .quick-links-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 10px;
            }
        }

        @media (min-width: 768px) {
            .quick-links-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 12px;
                max-width: 100%;
            }
        }

        @media (min-width: 992px) {
            .quick-links-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 14px;
                max-width: 100%;
            }
        }

        @media (min-width: 1200px) {
            .quick-links-grid {
                grid-template-columns: repeat(6, 1fr);
                gap: 12px;
                max-width: 100%;
            }
        }

        .quick-link-btn {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 10px 8px;
            border-radius: var(--border-radius-sm);
            border: 2px solid;
            background: white;
            text-decoration: none;
            transition: var(--transition);
            font-size: 11px;
            font-weight: 600;
            min-height: 70px;
            gap: 6px;
            cursor: pointer;
        }

        @media (min-width: 576px) {
            .quick-link-btn {
                padding: 12px 10px;
                font-size: 12px;
                min-height: 75px;
                gap: 8px;
            }
        }

        @media (min-width: 768px) {
            .quick-link-btn {
                flex-direction: row;
                padding: 12px 14px;
                font-size: 13px;
                min-height: 50px;
                gap: 8px;
            }
        }

        @media (min-width: 992px) {
            .quick-link-btn {
                padding: 14px 16px;
                font-size: 14px;
                min-height: 52px;
                gap: 10px;
            }
        }

        @media (min-width: 1200px) {
            .quick-link-btn {
                padding: 10px 12px;
                font-size: 13px;
                min-height: 48px;
                gap: 6px;
            }
        }

        .quick-link-btn i {
            font-size: 18px;
            line-height: 1;
        }

        @media (min-width: 576px) {
            .quick-link-btn i {
                font-size: 20px;
            }
        }

        @media (min-width: 768px) {
            .quick-link-btn i {
                font-size: 18px;
            }
        }

        @media (min-width: 992px) {
            .quick-link-btn i {
                font-size: 20px;
            }
        }

        @media (min-width: 1200px) {
            .quick-link-btn i {
                font-size: 16px;
            }
        }

        .quick-link-text {
            text-align: center;
            line-height: 1.2;
            word-break: break-word;
        }

        @media (min-width: 768px) {
            .quick-link-text {
                white-space: nowrap;
                word-break: normal;
            }
        }

        @media (max-width: 575px) {
            .quick-link-text {
                font-size: 10px;
            }
        }

        @media (max-width: 360px) {
            .quick-links {
                padding: 10px;
            }
            
            .quick-links-grid {
                gap: 6px;
            }
            
            .quick-link-btn {
                padding: 8px 6px;
                min-height: 65px;
                font-size: 10px;
            }
            
            .quick-link-btn i {
                font-size: 16px;
            }
            
            .quick-link-text {
                font-size: 9px;
            }
        }

        /* Button color variants */
        .quick-link-btn.btn-outline-primary {
            border-color: #0d6efd;
            color: #0d6efd;
        }

        .quick-link-btn.btn-outline-primary:hover,
        .quick-link-btn.btn-outline-primary:active {
            background: #0d6efd;
            color: white;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .quick-link-btn.btn-outline-info {
            border-color: #0dcaf0;
            color: #0dcaf0;
        }

        .quick-link-btn.btn-outline-info:hover,
        .quick-link-btn.btn-outline-info:active {
            background: #0dcaf0;
            color: white;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .quick-link-btn.btn-outline-success {
            border-color: #198754;
            color: #198754;
        }

        .quick-link-btn.btn-outline-success:hover,
        .quick-link-btn.btn-outline-success:active {
            background: #198754;
            color: white;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .quick-link-btn.btn-outline-warning {
            border-color: #ffc107;
            color: #ffc107;
        }

        .quick-link-btn.btn-outline-warning:hover,
        .quick-link-btn.btn-outline-warning:active {
            background: #ffc107;
            color: #212529;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .gap-2 {
            gap: 8px !important;
        }

        /* Custom Radio Buttons - Touch Friendly */
        .custom-radio-group {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .custom-radio {
            display: flex;
            align-items: center;
            cursor: pointer;
            padding: 8px 0;
            min-height: 44px; /* Touch target */
        }

        .custom-radio input[type="radio"] {
            width: 20px;
            height: 20px;
            margin-right: 8px;
            cursor: pointer;
            accent-color: var(--primary-color);
        }

        .custom-radio label {
            cursor: pointer;
            font-size: 15px;
            margin: 0;
            user-select: none;
        }

        /* Buttons - Modern App Style */
        .btn-register {
            background: #0751ad;
            border: none;
            padding: 16px 32px;
            font-weight: 700;
            font-size: 16px;
            border-radius: var(--border-radius-lg);
            transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
            color: white;
            min-height: 56px; /* Large touch target */
            width: 100%;
            max-width: 100%;
            box-shadow: var(--shadow-md);
            position: relative;
            overflow: hidden;
            will-change: transform;
        }

        .btn-register::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 0;
            height: 0;
            border-radius: 50%;
            background: rgba(255,255,255,0.3);
            transform: translate(-50%, -50%);
            transition: width 0.4s ease, height 0.4s ease;
        }

        .btn-register:active::before {
            width: 300px;
            height: 300px;
        }

        @media (hover: hover) {
            .btn-register:hover,
            .btn-register:focus {
                background: #06408a;
                transform: translateY(-2px);
                box-shadow: var(--shadow-lg);
            }
        }

        .btn-register:active {
            transform: scale(0.98);
        }

        .btn-register:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        @media (min-width: 768px) {
            .btn-register {
                width: auto;
                min-width: 200px;
            }
        }

        /* Alert Success */
        .alert-success {
            background: linear-gradient(135deg, #d4edda, #c3e6cb);
            border: none;
            border-radius: var(--border-radius);
            padding: 20px;
            box-shadow: var(--shadow-sm);
        }

        .alert-info {
            border-radius: var(--border-radius);
            border: none;
            padding: 16px;
            box-shadow: var(--shadow-sm);
        }

        /* Row & Column Adjustments for Mobile */
        .row {
            margin-left: -8px;
            margin-right: -8px;
        }

        .row > * {
            padding-left: 8px;
            padding-right: 8px;
        }

        @media (min-width: 768px) {
            .row {
                margin-left: -12px;
                margin-right: -12px;
            }
            .row > * {
                padding-left: 12px;
                padding-right: 12px;
            }
        }

        .mb-3 {
            margin-bottom: 20px !important;
        }

        .mb-4 {
            margin-bottom: 24px !important;
        }

        /* QA System Styles - Modernized */
        .qa-container {
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: var(--border-radius);
            padding: 20px;
            margin: 20px 0;
            border: 1px solid #dee2e6;
        }

        @media (min-width: 768px) {
            .qa-container {
                padding: 24px;
            }
        }

        .qa-search-box {
            position: relative;
            margin-bottom: 20px;
        }

        .qa-search-input {
            border-radius: var(--border-radius-lg);
            border: 2px solid var(--primary-color);
            padding: 14px 50px 14px 20px;
            font-size: 16px; /* Prevents zoom on iOS */
            transition: var(--transition);
            width: 100%;
            min-height: 48px;
        }

        .qa-search-input:focus {
            border-color: var(--primary-light);
            box-shadow: 0 0 0 4px rgba(40, 167, 69, 0.1);
            outline: none;
        }

        .qa-search-icon {
            position: absolute;
            right: 18px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--primary-color);
            font-size: 18px;
        }

        .qa-results {
            max-height: 400px;
            overflow-y: auto;
            -webkit-overflow-scrolling: touch;
            padding-right: 4px;
        }

        .qa-results::-webkit-scrollbar {
            width: 6px;
        }

        .qa-results::-webkit-scrollbar-track {
            background: #f1f1f1;
            border-radius: 10px;
        }

        .qa-results::-webkit-scrollbar-thumb {
            background: var(--primary-color);
            border-radius: 10px;
        }

        .qa-item {
            background: white;
            border-radius: var(--border-radius-sm);
            padding: 16px;
            margin-bottom: 12px;
            border-left: 4px solid var(--primary-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .qa-item:active {
            transform: scale(0.98);
        }

        @media (hover: hover) {
            .qa-item:hover {
                transform: translateY(-2px);
                box-shadow: var(--shadow-md);
            }
        }

        .qa-question {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
            font-size: 16px;
            line-height: 1.4;
        }

        .qa-answer {
            color: #333;
            line-height: 1.6;
            font-size: 14px;
        }

        .qa-no-results {
            text-align: center;
            padding: 40px 20px;
            color: #6c757d;
        }

        .qa-no-results i {
            font-size: 48px;
            margin-bottom: 15px;
            color: #dee2e6;
        }

        .qa-categories {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 20px;
        }

        .qa-category-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 10px 16px;
            border-radius: var(--border-radius-lg);
            font-size: 13px;
            font-weight: 600;
            transition: var(--transition);
            min-height: 40px;
            cursor: pointer;
        }

        .qa-category-btn:active {
            transform: scale(0.95);
        }

        @media (hover: hover) {
            .qa-category-btn:hover {
                background: var(--primary-light);
                transform: translate3d(0, -1px, 0);
            }
        }

        .qa-category-btn.active {
            background: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }

        .qa-suggestions {
            margin-bottom: 16px;
        }

        .qa-suggestion-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .qa-suggestion-tag {
            background: #e3f2fd;
            color: #1976d2;
            padding: 8px 14px;
            border-radius: var(--border-radius-lg);
            font-size: 13px;
            cursor: pointer;
            border: 1px solid #bbdefb;
            transition: var(--transition);
            white-space: nowrap;
            min-height: 36px;
            display: inline-flex;
            align-items: center;
            user-select: none;
        }

        .qa-suggestion-tag:active {
            transform: scale(0.95);
        }

        @media (hover: hover) {
            .qa-suggestion-tag:hover {
                background: #1976d2;
                color: white;
                transform: translate3d(0, -1px, 0);
                box-shadow: 0 2px 4px rgba(25, 118, 210, 0.3);
            }
        }

        /* Modal Adjustments for Mobile */
        .modal-dialog {
            margin: 12px;
        }

        @media (min-width: 576px) {
            .modal-dialog {
                margin: 24px auto;
            }
        }

        .modal-content {
            border-radius: var(--border-radius);
            border: none;
            box-shadow: var(--shadow-lg);
        }

        .modal-header {
            border-bottom: 1px solid #e9ecef;
            padding: 16px 20px;
        }

        .modal-body {
            padding: 20px;
        }

        .modal-footer {
            border-top: 1px solid #e9ecef;
            padding: 16px 20px;
        }

        /* Footer */
        footer {
            border-radius: 0;
            margin-top: 32px;
        }

        /* Text Center */
        .text-center {
            text-align: center;
        }

        /* Loading Spinner */
        .fa-spinner {
            animation: spin 1s linear infinite;
        }

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

        /* Smooth Scrolling */
        html {
            scroll-behavior: smooth;
        }

        /* Focus Visible for Accessibility */
        *:focus-visible {
            outline: 2px solid var(--primary-color);
            outline-offset: 2px;
        }

        /* Touch Active State */
        .touch-active {
            opacity: 0.7;
            transform: scale(0.98);
        }


        /* Better Scrollbar for Mobile */
        @media (max-width: 768px) {
            ::-webkit-scrollbar {
                width: 4px;
                height: 4px;
            }
        }

        /* Prevent text selection on buttons */
        button, .btn, .qa-suggestion-tag, .qa-category-btn {
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
            -webkit-touch-callout: none;
            touch-action: manipulation;
        }

        /* Validation Error Animation */
        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translate3d(0, -10px, 0);
            }
            to {
                opacity: 1;
                transform: translate3d(0, 0, 0);
            }
        }

        .validation-error-message {
            animation: slideDown 0.3s ease-out;
        }

        /* Improve tap targets on mobile */
        @media (max-width: 768px) {
            input, select, textarea, button, .btn {
                min-height: 44px;
                touch-action: manipulation;
            }
            
            .custom-radio {
                min-height: 44px;
            }
            
            /* Optimize scrolling on mobile */
            * {
                -webkit-overflow-scrolling: touch;
            }
        }
        
        /* QR Scanner Styles */
        #qrReader {
            border: 2px solid var(--primary-color);
            border-radius: var(--border-radius);
            overflow: hidden;
            background: #000;
            min-height: 300px;
            position: relative;
        }
        
        #qrReader video {
            width: 100% !important;
            height: auto !important;
            display: block;
            object-fit: cover;
        }
        
        #qrReader canvas {
            width: 100% !important;
            height: auto !important;
        }
        
        #qrReader > div {
            width: 100% !important;
        }
        
        #qrScanStatus {
            margin-top: 16px;
            border-radius: var(--border-radius-sm);
            animation: slideDown 0.3s ease-out;
        }
        
        /* Fix for html5-qrcode library */
        #qrReader__dashboard_section {
            display: none !important;
        }
        
        #qrReader__scan_region {
            width: 100% !important;
        }