/* Enhanced Mobile Styles for QuizNotion - Phase 1 Implementation */

/* ========== CSS Variables for Mobile ========== */
:root {
    /* Touch target sizes */
    --touch-target-min: 44px;
    --touch-target-comfortable: 48px;
    
    /* Responsive spacing */
    --space-unit: clamp(0.25rem, 1vw, 0.5rem);
    --space-xs: calc(var(--space-unit) * 1);
    --space-sm: calc(var(--space-unit) * 2);
    --space-md: calc(var(--space-unit) * 4);
    --space-lg: calc(var(--space-unit) * 6);
    --space-xl: calc(var(--space-unit) * 8);
    
    /* Fluid typography */
    --text-xs: clamp(0.75rem, 2vw, 0.875rem);
    --text-sm: clamp(0.875rem, 2.5vw, 1rem);
    --text-base: clamp(1rem, 3vw, 1.125rem);
    --text-lg: clamp(1.125rem, 3.5vw, 1.25rem);
    --text-xl: clamp(1.25rem, 4vw, 1.5rem);
    --text-2xl: clamp(1.5rem, 5vw, 2rem);
    
    /* Mobile-specific colors */
    --mobile-primary: var(--bs-primary, #0d6efd);
    --mobile-success: var(--bs-success, #198754);
    --mobile-warning: var(--bs-warning, #ffc107);
    --mobile-danger: var(--bs-danger, #dc3545);
    --mobile-bg-primary: var(--bg-primary, #ffffff);
    --mobile-bg-secondary: var(--bg-secondary, #f8f9fa);
    --mobile-border: var(--border-color, #dee2e6);
}

/* ========== Phase 1.1: Touch Target Optimization ========== */

/* Global touch target sizing */
@media (max-width: 991px) {
    /* All interactive elements must meet minimum touch target */
    button, 
    .btn, 
    a.btn,
    .nav-link,
    .dropdown-item,
    input[type="submit"],
    input[type="button"],
    .clickable,
    .mobile-touchable {
        min-height: var(--touch-target-min);
        min-width: var(--touch-target-min);
        display: inline-flex;
        align-items: center;
        justify-content: center;
        position: relative;
        touch-action: manipulation; /* Prevent double-tap zoom */
    }
    
    /* Ensure button text is centered even with min-height */
    .btn {
        padding: 12px 24px;
        font-size: var(--text-base);
        line-height: 1.5;
    }
    
    /* Small buttons need special handling */
    .btn-sm {
        padding: 8px 16px;
        font-size: var(--text-sm);
    }
    
    /* Radio buttons and checkboxes - enhanced touch targets */
    .form-check {
        padding-left: 0;
        margin-bottom: var(--space-md);
    }
    
    .form-check-input {
        position: absolute;
        opacity: 0;
        width: var(--touch-target-min);
        height: var(--touch-target-min);
        cursor: pointer;
    }
    
    .form-check-label {
        position: relative;
        padding-left: calc(var(--touch-target-min) + var(--space-sm));
        min-height: var(--touch-target-min);
        display: flex;
        align-items: center;
        cursor: pointer;
        user-select: none;
        font-size: var(--text-base);
    }
    
    /* Custom checkbox/radio appearance */
    .form-check-label::before {
        content: '';
        position: absolute;
        left: 0;
        top: 50%;
        transform: translateY(-50%);
        width: 24px;
        height: 24px;
        border: 2px solid var(--mobile-border);
        background: var(--mobile-bg-primary);
        transition: all 0.2s ease;
    }
    
    /* Radio button specific */
    input[type="radio"] + .form-check-label::before {
        border-radius: 50%;
    }
    
    /* Checkbox specific */
    input[type="checkbox"] + .form-check-label::before {
        border-radius: 4px;
    }
    
    /* Checked state */
    .form-check-input:checked + .form-check-label::before {
        background: var(--mobile-primary);
        border-color: var(--mobile-primary);
    }
    
    /* Checkmark for checkbox */
    input[type="checkbox"]:checked + .form-check-label::after {
        content: '✓';
        position: absolute;
        left: 7px;
        top: 50%;
        transform: translateY(-50%);
        color: white;
        font-size: 16px;
        font-weight: bold;
    }
    
    /* Dot for radio */
    input[type="radio"]:checked + .form-check-label::after {
        content: '';
        position: absolute;
        left: 8px;
        top: 50%;
        transform: translateY(-50%);
        width: 8px;
        height: 8px;
        background: white;
        border-radius: 50%;
    }
    
    /* Focus states for accessibility */
    .form-check-input:focus + .form-check-label::before {
        box-shadow: 0 0 0 3px rgba(var(--mobile-primary), 0.25);
    }
    
    /* Quiz option cards - enhanced for mobile */
    .option-card,
    .mobile-option-card {
        min-height: 72px;
        padding: var(--space-md);
        margin: var(--space-sm) 0;
        border-radius: 12px;
        background: var(--mobile-bg-secondary);
        border: 2px solid transparent;
        transition: all 0.2s ease;
        cursor: pointer;
        position: relative;
        width: 100%;
        text-align: left;
    }
    
    .option-card:active,
    .mobile-option-card:active {
        transform: scale(0.98);
        background: var(--mobile-bg-secondary);
    }
    
    /* Navigation links need proper spacing */
    .navbar-nav .nav-link {
        padding: var(--space-md) var(--space-lg);
        margin: var(--space-xs) 0;
    }
    
    /* Dropdown items */
    .dropdown-item {
        padding: var(--space-md) var(--space-lg);
        font-size: var(--text-base);
    }
    
    /* Form inputs */
    .form-control,
    .form-select,
    select,
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="number"],
    input[type="tel"],
    input[type="search"],
    textarea {
        min-height: var(--touch-target-comfortable);
        padding: var(--space-md);
        font-size: var(--text-base);
        border-radius: 8px;
    }
    
    /* Larger touch area for select dropdowns */
    select.form-control,
    .form-select {
        background-position: right var(--space-md) center;
        padding-right: calc(var(--space-xl) + 16px);
    }
    
    /* Icon buttons need special handling */
    .btn-icon {
        width: var(--touch-target-comfortable);
        height: var(--touch-target-comfortable);
        padding: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 50%;
    }
    
    /* Close buttons */
    .btn-close,
    .close {
        width: var(--touch-target-min);
        height: var(--touch-target-min);
        padding: var(--space-sm);
    }
    
    /* Pagination */
    .page-link {
        min-width: var(--touch-target-min);
        min-height: var(--touch-target-min);
        padding: var(--space-sm) var(--space-md);
        font-size: var(--text-base);
    }
    
    /* Tabs */
    .nav-tabs .nav-link,
    .nav-pills .nav-link {
        min-height: var(--touch-target-min);
        padding: var(--space-md) var(--space-lg);
        font-size: var(--text-base);
    }
    
    /* Modal headers and footers */
    .modal-header {
        padding: var(--space-lg);
    }
    
    .modal-footer {
        padding: var(--space-lg);
        gap: var(--space-md);
    }
    
    .modal-footer .btn {
        flex: 1;
        max-width: 200px;
    }
    
    /* Cards need better spacing */
    .card {
        margin-bottom: var(--space-lg);
    }
    
    .card-body {
        padding: var(--space-lg);
    }
    
    .card-header {
        padding: var(--space-md) var(--space-lg);
    }
    
    /* List group items */
    .list-group-item {
        padding: var(--space-md) var(--space-lg);
        min-height: var(--touch-target-comfortable);
    }
    
    /* Badge and pills */
    .badge {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--text-sm);
        min-height: 28px;
        display: inline-flex;
        align-items: center;
    }
    
    /* Alerts */
    .alert {
        padding: var(--space-lg);
        margin-bottom: var(--space-lg);
        font-size: var(--text-base);
    }
    
    .alert .btn-close {
        position: absolute;
        top: var(--space-md);
        right: var(--space-md);
    }
}

/* ========== Specific Component Enhancements ========== */

/* Quiz question navigation buttons */
@media (max-width: 991px) {
    #prevQuestion,
    #nextQuestion,
    .question-nav-btn {
        min-width: 120px;
        min-height: var(--touch-target-comfortable);
        font-size: var(--text-base);
        padding: var(--space-md) var(--space-lg);
    }
    
    /* Submit quiz button - make it prominent */
    #submitQuiz,
    .submit-quiz-btn {
        width: 100%;
        min-height: 56px;
        font-size: var(--text-lg);
        font-weight: 600;
        margin-top: var(--space-xl);
    }
    
    /* Timer display needs to be larger */
    #timerDisplay,
    .timer-display {
        font-size: var(--text-lg);
        padding: var(--space-sm) var(--space-md);
        min-height: var(--touch-target-min);
    }
    
    /* Progress indicators */
    .progress {
        height: 24px;
        margin-bottom: var(--space-lg);
    }
    
    .progress-bar {
        font-size: var(--text-sm);
        line-height: 24px;
    }
}

/* ========== Loading States and Feedback ========== */
@media (max-width: 991px) {
    /* Loading spinners */
    .spinner-border {
        width: 24px;
        height: 24px;
        border-width: 3px;
    }
    
    /* Touch feedback */
    .touchable:active,
    button:active,
    .btn:active {
        opacity: 0.8;
        transform: scale(0.98);
    }
    
    /* Ripple effect for material-like feedback */
    @keyframes ripple {
        to {
            transform: scale(4);
            opacity: 0;
        }
    }
    
    .ripple {
        position: relative;
        overflow: hidden;
    }
    
    .ripple::before {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        width: 0;
        height: 0;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.5);
        transform: translate(-50%, -50%);
        transition: width 0.6s, height 0.6s;
    }
    
    .ripple:active::before {
        width: 100px;
        height: 100px;
        animation: ripple 0.6s;
    }
}

/* ========== Accessibility Enhancements ========== */
@media (max-width: 991px) {
    /* Focus visible for keyboard navigation */
    *:focus-visible {
        outline: 3px solid var(--mobile-primary);
        outline-offset: 2px;
    }
    
    /* Skip links */
    .skip-link {
        position: absolute;
        top: -40px;
        left: 0;
        background: var(--mobile-primary);
        color: white;
        padding: var(--space-md);
        text-decoration: none;
        border-radius: 0 0 8px 0;
    }
    
    .skip-link:focus {
        top: 0;
    }
    
    /* High contrast mode support */
    @media (prefers-contrast: high) {
        .btn,
        .form-control,
        .card {
            border-width: 2px;
        }
    }
    
    /* Reduced motion support */
    @media (prefers-reduced-motion: reduce) {
        *,
        *::before,
        *::after {
            animation-duration: 0.01ms !important;
            animation-iteration-count: 1 !important;
            transition-duration: 0.01ms !important;
        }
    }
}

/* ========== Utility Classes ========== */
@media (max-width: 991px) {
    /* Spacing utilities */
    .mobile-mt-0 { margin-top: 0 !important; }
    .mobile-mt-1 { margin-top: var(--space-xs) !important; }
    .mobile-mt-2 { margin-top: var(--space-sm) !important; }
    .mobile-mt-3 { margin-top: var(--space-md) !important; }
    .mobile-mt-4 { margin-top: var(--space-lg) !important; }
    .mobile-mt-5 { margin-top: var(--space-xl) !important; }
    
    .mobile-mb-0 { margin-bottom: 0 !important; }
    .mobile-mb-1 { margin-bottom: var(--space-xs) !important; }
    .mobile-mb-2 { margin-bottom: var(--space-sm) !important; }
    .mobile-mb-3 { margin-bottom: var(--space-md) !important; }
    .mobile-mb-4 { margin-bottom: var(--space-lg) !important; }
    .mobile-mb-5 { margin-bottom: var(--space-xl) !important; }
    
    /* Text utilities */
    .mobile-text-center { text-align: center !important; }
    .mobile-text-left { text-align: left !important; }
    .mobile-text-right { text-align: right !important; }
    
    /* Display utilities */
    .mobile-hide { display: none !important; }
    .mobile-show { display: block !important; }
    .mobile-flex { display: flex !important; }
    
    /* Full width on mobile */
    .mobile-w-100 { width: 100% !important; }
}

/* ========== Phase 1.2: Mobile Bottom Navigation ========== */
.mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--mobile-bg-primary);
    border-top: 1px solid var(--mobile-border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

.mobile-bottom-nav .nav-button {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px;
    min-height: var(--touch-target-min);
    border: none;
    background: none;
    color: var(--text-secondary);
    font-size: 11px;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.mobile-bottom-nav .nav-button:active {
    transform: scale(0.95);
}

.mobile-bottom-nav .nav-button.active,
.mobile-bottom-nav .nav-button:hover {
    color: var(--mobile-primary);
}

.mobile-bottom-nav .nav-button.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20%;
    right: 20%;
    height: 3px;
    background: var(--mobile-primary);
    border-radius: 0 0 3px 3px;
}

.mobile-bottom-nav .nav-button i {
    font-size: 20px;
    margin-bottom: 3px;
}

.mobile-bottom-nav .nav-button span {
    font-weight: 500;
}

/* Dark mode support for bottom nav */
[data-theme="dark"] .mobile-bottom-nav {
    background: #1a1a1a;
    border-top-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .mobile-bottom-nav .nav-button {
    color: rgba(255, 255, 255, 0.6);
}

[data-theme="dark"] .mobile-bottom-nav .nav-button.active,
[data-theme="dark"] .mobile-bottom-nav .nav-button:hover {
    color: var(--mobile-primary);
}

/* Adjust content padding when bottom nav is present */
@media (max-width: 991px) {
    body.has-mobile-nav {
        padding-bottom: calc(60px + env(safe-area-inset-bottom));
    }
    
    /* Ensure footer is above bottom nav */
    .footer {
        margin-bottom: calc(60px + env(safe-area-inset-bottom));
    }
}