/* ========================================
   MOBILE RESPONSIVE ENHANCEMENT
   Tối ưu hóa hoàn toàn cho thiết bị di động
   ======================================== */

/* ========================================
   GLOBAL MOBILE FIXES
   ======================================== */

/* Prevent zoom on input focus (iOS) */
@media (max-width: 767px) {
    input[type="text"],
    input[type="number"],
    input[type="email"],
    input[type="password"],
    textarea,
    select {
        font-size: 16px !important; /* Prevents iOS zoom */
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

/* Prevent horizontal scroll */
body {
    overflow-x: hidden;
    max-width: 100vw;
    position: relative;
}

/* Better tap highlighting */
* {
    -webkit-tap-highlight-color: rgba(102, 126, 234, 0.2);
    -webkit-touch-callout: none;
}

/* ========================================
   MOBILE MENU TOGGLE BUTTON
   ======================================== */

.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 1001;
    width: 44px;
    height: 44px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.mobile-menu-toggle:active {
    transform: scale(0.95);
}

.mobile-menu-toggle i {
    font-size: 20px;
    color: var(--text-primary);
}

@media (max-width: 1023px) {
    .mobile-menu-toggle {
        display: flex;
    }
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* ========================================
   TABLET (768px - 1023px)
   ======================================== */
@media (min-width: 768px) and (max-width: 1023px) {
    /* Sidebar */
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-wrapper {
        margin-left: 0;
        width: 100%;
    }
    
    /* Header adjustments */
    .top-header {
        padding-left: 68px; /* Space for menu button */
    }
    
    .header-left .current-quiz-info {
        display: none;
    }
    
    .header-center {
        flex: 1;
        max-width: 500px;
    }
    
    .btn-create-quiz span {
        display: none;
    }
    
    /* Stats grid */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Quiz grid */
    .quiz-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Features grid */
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Modern quiz layout */
    .modern-quiz-layout {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .quiz-sidebar-left {
        order: 2;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .quiz-info-card,
    .quiz-timer-card {
        grid-column: span 1;
    }
    
    .quiz-settings-card,
    .quiz-progress-card {
        grid-column: span 1;
    }
    
    .quiz-actions-card {
        grid-column: 1 / -1;
        display: flex;
        flex-direction: row;
        gap: 12px;
    }
    
    .quiz-main-content {
        order: 1;
    }
    
    .quiz-sidebar-right {
        order: 3;
        position: static;
        max-height: none;
    }
    
    .question-grid {
        grid-template-columns: repeat(10, 1fr);
    }
}

/* ========================================
   MOBILE (480px - 767px)
   ======================================== */
@media (min-width: 480px) and (max-width: 767px) {
    /* Sidebar */
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-wrapper {
        margin-left: 0;
        width: 100%;
    }
    
    /* Header */
    .top-header {
        height: 60px;
        padding: 0 12px 0 68px;
        gap: 12px;
    }
    
    .header-left {
        display: none;
    }
    
    .header-center {
        flex: 1;
    }
    
    .search-bar {
        padding: 10px 14px;
        font-size: 15px;
    }
    
    .search-bar input {
        font-size: 15px;
    }
    
    .btn-create-quiz {
        padding: 10px;
        width: 44px;
        height: 44px;
    }
    
    .btn-create-quiz span {
        display: none;
    }
    
    .theme-toggle-btn {
        width: 44px;
        height: 44px;
    }
    
    .user-avatar-small {
        width: 36px;
        height: 36px;
    }
    
    /* Main content */
    .main-content-area {
        padding: 16px;
    }
    
    .page-header {
        margin-bottom: 20px;
    }
    
    .page-title {
        font-size: 22px;
    }
    
    /* Stats */
    .stats-section {
        padding: 20px 16px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .stat-card {
        padding: 18px;
    }
    
    .stat-icon {
        width: 48px;
        height: 48px;
        font-size: 22px;
    }
    
    .stat-value {
        font-size: 24px;
    }
    
    .stat-label {
        font-size: 13px;
    }
    
    /* Quiz grid */
    .quiz-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .feature-card {
        padding: 24px;
    }
    
    /* Form */
    .form-card {
        padding: 24px 20px;
    }
    
    .form-group {
        margin-bottom: 20px;
    }
    
    .form-group label {
        font-size: 14px;
        margin-bottom: 8px;
        display: block;
    }
    
    .form-input,
    .form-select {
        padding: 12px 16px;
        font-size: 16px;
        border-radius: 10px;
    }
    
    .form-textarea {
        padding: 12px 16px;
        font-size: 16px;
        min-height: 120px;
        border-radius: 10px;
    }
    
    .form-textarea.large {
        min-height: 180px;
    }
    
    .btn-paste-inline {
        position: static;
        margin-bottom: 10px;
        width: 100%;
        padding: 10px 16px;
    }
    
    .form-actions {
        flex-direction: column;
        gap: 12px;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 14px 24px;
        font-size: 15px;
    }
    
    /* Modern quiz layout */
    .modern-quiz-layout {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .quiz-sidebar-left {
        order: 2;
        display: flex;
        flex-direction: column;
        gap: 12px;
    }
    
    .quiz-info-card,
    .quiz-timer-card,
    .quiz-settings-card,
    .quiz-progress-card {
        padding: 18px;
    }
    
    .quiz-title-sidebar {
        font-size: 18px;
    }
    
    .timer-display {
        font-size: 32px;
    }
    
    .quiz-actions-card {
        display: flex;
        flex-direction: column;
        gap: 10px;
        padding: 16px;
    }
    
    .btn-back-quiz,
    .btn-submit-quiz {
        width: 100%;
        padding: 14px 20px;
        font-size: 15px;
        justify-content: center;
    }
    
    .quiz-main-content {
        order: 1;
    }
    
    .quiz-sidebar-right {
        order: 3;
        position: static;
        max-height: none;
        padding: 18px;
    }
    
    /* Question card */
    .question-card,
    .question-card-modern {
        padding: 20px 18px;
    }
    
    .question-text,
    .question-text-modern {
        font-size: 16px;
        padding: 16px;
        line-height: 1.7;
    }
    
    /* Options */
    .option,
    .option-modern {
        padding: 14px 16px;
        gap: 12px;
        min-height: 56px;
    }
    
    .option input[type="radio"],
    .option-modern input[type="radio"] {
        width: 22px;
        height: 22px;
    }
    
    .option-label,
    .option-modern .option-letter {
        min-width: 28px;
        font-size: 16px;
    }
    
    .option-text,
    .option-modern .option-text {
        font-size: 15px;
        line-height: 1.6;
    }
    
    /* Question grid */
    .question-grid {
        grid-template-columns: repeat(8, 1fr);
        gap: 8px;
    }
    
    .question-grid-item {
        font-size: 14px;
        min-height: 44px;
    }
    
    /* Navigation */
    .quiz-navigation {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn-nav {
        width: 100%;
        padding: 14px 24px;
        font-size: 15px;
        justify-content: center;
    }
    
    /* Modal */
    .modal-content {
        width: 95%;
        max-width: 500px;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: 20px;
    }
    
    .modal-footer {
        flex-direction: column;
        gap: 10px;
    }
    
    /* Results */
    .results-header {
        padding: 36px 24px;
    }
    
    .score-display {
        font-size: 60px;
    }
    
    .results-stats {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    /* AI Quiz */
    .ai-info-banner {
        padding: 16px;
        font-size: 14px;
    }
    
    .file-upload-area {
        padding: 24px 16px;
    }
    
    .ai-preview-section {
        padding: 20px;
    }
}

/* ========================================
   MOBILE SMALL (< 480px)
   ======================================== */
@media (max-width: 479px) {
    /* Sidebar */
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100vh;
        width: 85%;
        max-width: 300px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-header {
        padding: 16px;
    }
    
    .logo-text {
        font-size: 18px;
    }
    
    .sidebar-nav .nav-item {
        padding: 14px 16px;
        font-size: 15px;
    }
    
    .main-wrapper {
        margin-left: 0;
        width: 100%;
    }
    
    /* Header */
    .top-header {
        height: 56px;
        padding: 0 8px 0 64px;
        gap: 8px;
    }
    
    .header-left {
        display: none;
    }
    
    .header-center {
        flex: 1;
    }
    
    .search-bar {
        padding: 8px 12px;
        font-size: 14px;
    }
    
    .search-bar i {
        font-size: 14px;
    }
    
    .search-bar input {
        font-size: 14px;
    }
    
    .header-right {
        gap: 6px;
    }
    
    .btn-create-quiz {
        padding: 8px;
        width: 40px;
        height: 40px;
    }
    
    .btn-create-quiz i {
        font-size: 16px;
    }
    
    .btn-create-quiz span {
        display: none;
    }
    
    .theme-toggle-btn {
        width: 40px;
        height: 40px;
        padding: 8px;
    }
    
    .theme-toggle-btn i {
        font-size: 16px;
    }
    
    .user-avatar-small {
        width: 32px;
        height: 32px;
        font-size: 12px;
    }
    
    /* Main content */
    .main-content-area {
        padding: 12px 10px;
    }
    
    .page-header {
        margin-bottom: 16px;
    }
    
    .page-title {
        font-size: 20px;
        gap: 8px;
    }
    
    .page-title i {
        font-size: 22px;
    }
    
    /* Section headers */
    .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .section-title {
        font-size: 18px;
    }
    
    /* Stats */
    .stats-section,
    .recent-section,
    .features-section {
        padding: 16px 12px;
        margin-bottom: 16px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .stat-card {
        padding: 16px;
        gap: 14px;
    }
    
    .stat-icon {
        width: 44px;
        height: 44px;
        font-size: 20px;
    }
    
    .stat-value {
        font-size: 22px;
    }
    
    .stat-label {
        font-size: 12px;
    }
    
    /* Quiz grid */
    .quiz-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .quiz-card {
        padding: 16px;
    }
    
    .quiz-card-header h3 {
        font-size: 16px;
    }
    
    .quiz-card-meta {
        font-size: 12px;
        gap: 8px;
    }
    
    .quiz-card-actions {
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .btn-sm {
        padding: 8px 14px;
        font-size: 12px;
    }
    
    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .feature-card {
        padding: 20px 16px;
    }
    
    .feature-icon {
        font-size: 36px;
        margin-bottom: 12px;
    }
    
    .feature-card h3 {
        font-size: 16px;
        margin-bottom: 8px;
    }
    
    .feature-card p {
        font-size: 13px;
    }
    
    /* Form */
    .form-card {
        padding: 20px 14px;
    }
    
    .form-group {
        margin-bottom: 18px;
    }
    
    .form-group label {
        font-size: 14px;
        margin-bottom: 8px;
        display: flex;
        align-items: center;
        gap: 6px;
        flex-wrap: wrap;
    }
    
    .form-input,
    .form-select {
        padding: 12px 14px;
        font-size: 16px;
        border-radius: 10px;
        width: 100%;
    }
    
    .form-textarea {
        padding: 12px 14px;
        font-size: 16px;
        min-height: 110px;
        border-radius: 10px;
        width: 100%;
    }
    
    .form-textarea.large {
        min-height: 160px;
    }
    
    .btn-paste-inline {
        position: static;
        margin-bottom: 10px;
        width: 100%;
        padding: 10px 16px;
        font-size: 14px;
    }
    
    .form-actions {
        flex-direction: column;
        gap: 10px;
        margin-top: 20px;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        padding: 14px 20px;
        font-size: 15px;
        justify-content: center;
    }
    
    /* Modern quiz layout */
    .modern-quiz-layout {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .quiz-sidebar-left {
        order: 2;
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    .quiz-info-card,
    .quiz-timer-card,
    .quiz-settings-card,
    .quiz-progress-card {
        padding: 16px;
        border-radius: 12px;
    }
    
    .quiz-title-sidebar {
        font-size: 17px;
        line-height: 1.4;
    }
    
    .quiz-mode {
        font-size: 13px;
    }
    
    .timer-label {
        font-size: 13px;
    }
    
    .timer-display {
        font-size: 28px;
    }
    
    .setting-item {
        font-size: 14px;
        padding: 10px 0;
    }
    
    .progress-section {
        gap: 12px;
    }
    
    .progress-icon {
        font-size: 28px;
    }
    
    .progress-title {
        font-size: 14px;
    }
    
    .progress-stats {
        font-size: 13px;
    }
    
    .progress-details {
        font-size: 12px;
    }
    
    .quiz-actions-card {
        display: flex;
        flex-direction: column;
        gap: 10px;
        padding: 14px;
    }
    
    .btn-back-quiz,
    .btn-submit-quiz {
        width: 100%;
        padding: 13px 18px;
        font-size: 14px;
        justify-content: center;
    }
    
    .quiz-main-content {
        order: 1;
    }
    
    .quiz-sidebar-right {
        order: 3;
        position: static;
        max-height: none;
        padding: 16px;
        border-radius: 12px;
    }
    
    .grid-title {
        font-size: 15px;
        margin-bottom: 12px;
    }
    
    /* Question card */
    .question-card,
    .question-card-modern {
        padding: 18px 14px;
        border-radius: 12px;
        min-height: auto;
    }
    
    .question-header {
        gap: 10px;
        margin-bottom: 14px;
    }
    
    .question-number {
        min-width: 36px;
        height: 36px;
        font-size: 14px;
        border-radius: 10px;
    }
    
    .question-header-modern {
        margin-bottom: 12px;
    }
    
    .question-label {
        font-size: 13px;
        padding: 6px 12px;
    }
    
    .question-text,
    .question-text-modern {
        font-size: 15px;
        padding: 14px;
        line-height: 1.6;
        border-radius: 10px;
    }
    
    /* Options */
    .options,
    .options-modern {
        gap: 10px;
    }
    
    .option,
    .option-modern {
        padding: 13px 14px;
        gap: 10px;
        min-height: 52px;
        border-radius: 10px;
    }
    
    .option input[type="radio"],
    .option-modern input[type="radio"] {
        width: 20px;
        height: 20px;
        flex-shrink: 0;
    }
    
    .option-label,
    .option-modern .option-letter {
        min-width: 26px;
        font-size: 15px;
    }
    
    .option-text,
    .option-modern .option-text {
        font-size: 14px;
        line-height: 1.5;
    }
    
    /* Question grid */
    .question-grid {
        grid-template-columns: repeat(6, 1fr);
        gap: 6px;
    }
    
    .question-grid-item {
        font-size: 13px;
        min-height: 40px;
        border-radius: 8px;
        border-width: 2px;
    }
    
    /* Navigation */
    .quiz-navigation {
        flex-direction: column;
        gap: 10px;
        margin-top: 16px;
    }
    
    .btn-nav {
        width: 100%;
        padding: 13px 20px;
        font-size: 14px;
        justify-content: center;
    }
    
    /* Modal */
    .modal-content {
        width: 100%;
        max-width: 100%;
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
        margin: 0;
    }
    
    .modal-header {
        padding: 16px;
    }
    
    .modal-header h3 {
        font-size: 17px;
    }
    
    .modal-close {
        width: 36px;
        height: 36px;
        font-size: 20px;
    }
    
    .modal-body {
        padding: 16px;
        max-height: calc(100vh - 130px);
    }
    
    .modal-input,
    .modal-textarea {
        padding: 12px 14px;
        font-size: 16px;
    }
    
    .modal-footer {
        padding: 16px;
        flex-direction: column;
        gap: 10px;
    }
    
    .edit-questions {
        max-height: calc(100vh - 300px);
    }
    
    .edit-question-item {
        padding: 16px;
    }
    
    /* Results */
    .results-header {
        padding: 28px 18px;
    }
    
    .performance-badge {
        font-size: 56px;
        margin-bottom: 12px;
    }
    
    .quiz-title-result {
        font-size: 15px;
        margin-bottom: 16px;
    }
    
    .score-display {
        font-size: 52px;
        margin-bottom: 12px;
    }
    
    .score-text {
        font-size: 17px;
    }
    
    .results-stats {
        grid-template-columns: 1fr;
        gap: 12px;
        margin-bottom: 24px;
    }
    
    .stat-number {
        font-size: 26px;
    }
    
    .stat-label {
        font-size: 12px;
    }
    
    .results-details h3 {
        font-size: 18px;
        margin-bottom: 16px;
    }
    
    .result-question {
        padding: 16px;
        margin-bottom: 12px;
        border-radius: 12px;
    }
    
    .result-question-text {
        font-size: 15px;
        line-height: 1.6;
    }
    
    .result-answers {
        font-size: 13px;
    }
    
    .result-options {
        gap: 10px;
    }
    
    .result-option {
        padding: 12px 14px;
        border-radius: 10px;
    }
    
    .result-option .option-letter {
        min-width: 26px;
        font-size: 15px;
    }
    
    .result-option .option-text {
        font-size: 14px;
    }
    
    /* Action buttons */
    .action-buttons-container {
        padding: 16px;
        gap: 10px;
        margin: 20px 0;
        flex-direction: column;
    }
    
    .action-buttons-container .btn {
        width: 100%;
    }
    
    /* AI Quiz */
    .ai-info-banner {
        padding: 14px;
        font-size: 13px;
        gap: 12px;
    }
    
    .ai-info-banner i {
        font-size: 20px;
    }
    
    .file-upload-area {
        padding: 20px 14px;
    }
    
    .file-upload-content h4 {
        font-size: 15px;
    }
    
    .file-upload-content p {
        font-size: 12px;
    }
    
    .divider-with-text {
        margin: 20px 0;
        font-size: 13px;
    }
    
    .ai-preview-section {
        padding: 18px 14px;
    }
    
    .ai-preview-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .preview-question {
        padding: 16px;
        margin-bottom: 12px;
    }
    
    .preview-question-text {
        font-size: 15px;
    }
    
    .preview-option {
        padding: 12px 14px;
    }
    
    .preview-option-text {
        font-size: 14px;
    }
    
    /* Scroll to top */
    .scroll-to-top {
        width: 48px;
        height: 48px;
        bottom: 16px;
        right: 16px;
        font-size: 20px;
    }
    
    /* Toast */
    .toast {
        bottom: 16px;
        right: 16px;
        left: 16px;
        min-width: auto;
        padding: 14px 16px;
        font-size: 14px;
    }
    
    .toast i {
        font-size: 20px;
    }
}

/* ========================================
   LANDSCAPE MODE (Mobile)
   ======================================== */
@media (max-height: 500px) and (orientation: landscape) {
    .top-header {
        height: 50px;
        padding: 0 8px 0 60px;
    }
    
    .mobile-menu-toggle {
        top: 8px;
        left: 8px;
        width: 40px;
        height: 40px;
    }
    
    .quiz-sidebar-left {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }
    
    .quiz-actions-card {
        grid-column: 1 / -1;
        flex-direction: row;
    }
    
    .quiz-info-card,
    .quiz-timer-card,
    .quiz-settings-card,
    .quiz-progress-card {
        padding: 12px;
    }
    
    .question-card-modern {
        min-height: auto;
        padding: 16px;
    }
    
    .question-text-modern {
        padding: 12px;
    }
    
    .modal-content {
        max-height: 95vh;
    }
    
    .modal-body {
        max-height: calc(95vh - 120px);
    }
    
    .results-header {
        padding: 20px;
    }
    
    .performance-badge {
        font-size: 40px;
        margin-bottom: 8px;
    }
    
    .score-display {
        font-size: 40px;
        margin-bottom: 8px;
    }
    
    .results-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========================================
   VERY SMALL SCREENS (< 360px)
   ======================================== */
@media (max-width: 359px) {
    .top-header {
        padding: 0 6px 0 58px;
    }
    
    .mobile-menu-toggle {
        width: 40px;
        height: 40px;
        top: 10px;
        left: 10px;
    }
    
    .btn-create-quiz,
    .theme-toggle-btn {
        width: 36px;
        height: 36px;
    }
    
    .user-avatar-small {
        width: 30px;
        height: 30px;
    }
    
    .page-title {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 16px;
    }
    
    .stat-value {
        font-size: 20px;
    }
    
    .timer-display {
        font-size: 24px;
    }
    
    .question-text,
    .question-text-modern {
        font-size: 14px;
        padding: 12px;
    }
    
    .option,
    .option-modern {
        padding: 11px 12px;
    }
    
    .option-text,
    .option-modern .option-text {
        font-size: 13px;
    }
    
    .question-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 5px;
    }
    
    .question-grid-item {
        font-size: 12px;
        min-height: 36px;
    }
    
    .score-display {
        font-size: 44px;
    }
}

/* ========================================
   TOUCH IMPROVEMENTS
   ======================================== */

/* Larger touch targets */
@media (hover: none) and (pointer: coarse) {
    button,
    a,
    .nav-item,
    .option,
    .option-modern,
    .question-grid-item,
    input[type="radio"],
    input[type="checkbox"] {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Better spacing for touch */
    .option,
    .option-modern {
        margin-bottom: 4px;
    }
    
    /* Prevent double-tap zoom */
    button,
    a {
        touch-action: manipulation;
    }
}

/* ========================================
   SAFE AREA INSETS (Notched devices)
   ======================================== */
@supports (padding: max(0px)) {
    .top-header {
        padding-left: max(68px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
        padding-top: env(safe-area-inset-top);
    }
    
    .mobile-menu-toggle {
        left: max(12px, env(safe-area-inset-left));
        top: max(12px, calc(env(safe-area-inset-top) + 12px));
    }
    
    .sidebar {
        padding-left: max(0px, env(safe-area-inset-left));
        padding-top: env(safe-area-inset-top);
    }
    
    .main-content-area {
        padding-left: max(12px, env(safe-area-inset-left));
        padding-right: max(12px, env(safe-area-inset-right));
        padding-bottom: max(12px, env(safe-area-inset-bottom));
    }
    
    .scroll-to-top {
        bottom: max(16px, calc(env(safe-area-inset-bottom) + 16px));
        right: max(16px, env(safe-area-inset-right));
    }
    
    .toast {
        bottom: max(16px, calc(env(safe-area-inset-bottom) + 16px));
        left: max(16px, env(safe-area-inset-left));
        right: max(16px, env(safe-area-inset-right));
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Better focus indicators on mobile */
@media (max-width: 767px) {
    *:focus-visible {
        outline: 3px solid var(--primary-color);
        outline-offset: 2px;
    }
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .sidebar {
        transition: none !important;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    .option,
    .option-modern,
    .question-card,
    .question-card-modern,
    .btn-primary,
    .btn-secondary {
        border-width: 3px;
    }
}