/* Enhanced Mobile Quiz Interface - Phase 2.1 */

/* ========== Mobile Quiz Variables ========== */
:root {
    --mobile-header-height: 60px;
    --mobile-nav-height: 60px;
    --mobile-content-padding: 16px;
    --mobile-option-gap: 12px;
    --mobile-option-padding: 20px;
    --mobile-question-font: clamp(1.125rem, 4vw, 1.375rem);
    --mobile-option-font: clamp(1rem, 3.5vw, 1.125rem);
}

/* ========== Phase 2.1: Redesigned Quiz Interface ========== */

/* Mobile Quiz Container */
@media (max-width: 991px) {
    #quizContainer {
        padding: 0;
        margin: 0;
    }
    
    /* Enhanced Mobile Header */
    .quiz-header-mobile {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: var(--mobile-header-height);
        background: var(--mobile-bg-primary);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        z-index: 1100;
        padding: 0 var(--mobile-content-padding);
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    
    .mobile-header-content {
        display: flex;
        justify-content: space-between;
        align-items: center;
        height: calc(var(--mobile-header-height) - 4px);
    }
    
    .mobile-quiz-title {
        font-size: 1rem;
        font-weight: 600;
        margin: 0;
        max-width: 40%;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        color: var(--text-primary);
    }
    
    .mobile-stats {
        display: flex;
        gap: 12px;
        align-items: center;
    }
    
    .mobile-stat {
        display: flex;
        align-items: center;
        gap: 4px;
        font-size: 0.875rem;
        font-weight: 500;
        padding: 6px 10px;
        border-radius: 20px;
        background: var(--mobile-bg-secondary);
        color: var(--text-primary);
        cursor: pointer;
        transition: all 0.2s ease;
        min-width: fit-content;
    }
    
    .mobile-stat:active {
        transform: scale(0.95);
        background: var(--mobile-primary);
        color: white;
    }
    
    .mobile-stat i {
        font-size: 0.75rem;
    }
    
    /* Progress bar at bottom of header */
    .mobile-progress {
        position: absolute;
        bottom: 0;
        left: 0;
        right: 0;
        height: 4px;
        background: rgba(0, 0, 0, 0.1);
        overflow: hidden;
    }
    
    .mobile-progress-fill {
        height: 100%;
        background: var(--mobile-primary);
        transition: width 0.3s ease;
        box-shadow: 0 0 4px rgba(var(--mobile-primary), 0.5);
    }
    
    /* Mobile Question Container */
    .mobile-question-container {
        padding-top: calc(var(--mobile-header-height) + var(--mobile-content-padding));
        padding-bottom: calc(var(--mobile-nav-height) + var(--mobile-content-padding) + env(safe-area-inset-bottom));
        min-height: 100vh;
        padding-left: var(--mobile-content-padding);
        padding-right: var(--mobile-content-padding);
    }
    
    .mobile-question-content {
        max-width: 600px;
        margin: 0 auto;
    }
    
    /* Question Text */
    .question-text {
        font-size: var(--mobile-question-font);
        line-height: 1.6;
        font-weight: 500;
        color: var(--text-primary);
        margin-bottom: 24px;
        word-wrap: break-word;
    }
    
    /* Mobile Options Container */
    .mobile-options {
        display: flex;
        flex-direction: column;
        gap: var(--mobile-option-gap);
    }
    
    /* Enhanced Option Cards */
    .mobile-option-card {
        display: block;
        width: 100%;
        padding: var(--mobile-option-padding);
        background: var(--mobile-bg-secondary);
        border: 2px solid transparent;
        border-radius: 16px;
        cursor: pointer;
        transition: all 0.2s ease;
        position: relative;
        overflow: hidden;
        -webkit-tap-highlight-color: transparent;
    }
    
    .mobile-option-card::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: radial-gradient(circle at var(--x, 50%) var(--y, 50%), rgba(var(--mobile-primary), 0.1), transparent);
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    
    .mobile-option-card:active::before {
        opacity: 1;
    }
    
    .mobile-option-card:active {
        transform: scale(0.98);
        border-color: var(--mobile-primary);
    }
    
    .mobile-option-card.selected {
        background: rgba(var(--mobile-primary), 0.1);
        border-color: var(--mobile-primary);
    }
    
    .mobile-option-card input {
        position: absolute;
        opacity: 0;
        pointer-events: none;
    }
    
    .option-content {
        display: flex;
        align-items: flex-start;
        gap: 16px;
    }
    
    .option-letter {
        flex-shrink: 0;
        width: 40px;
        height: 40px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: var(--mobile-bg-primary);
        border-radius: 12px;
        font-weight: 700;
        font-size: 1.125rem;
        color: var(--text-primary);
        transition: all 0.2s ease;
    }
    
    .mobile-option-card.selected .option-letter {
        background: var(--mobile-primary);
        color: white;
    }
    
    .option-text {
        flex: 1;
        font-size: var(--mobile-option-font);
        line-height: 1.5;
        padding-top: 8px;
        color: var(--text-primary);
    }
    
    /* Multi-select checkbox styling */
    .mobile-option-card[data-type="checkbox"] .option-letter::after {
        content: '✓';
        position: absolute;
        color: white;
        font-size: 1.25rem;
        opacity: 0;
        transform: scale(0);
        transition: all 0.2s ease;
    }
    
    .mobile-option-card[data-type="checkbox"].selected .option-letter::after {
        opacity: 1;
        transform: scale(1);
    }
    
    /* Mobile Bottom Navigation Enhanced */
    .mobile-quiz-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: calc(var(--mobile-nav-height) + env(safe-area-inset-bottom));
        background: var(--mobile-bg-primary);
        border-top: 1px solid var(--mobile-border);
        display: flex;
        justify-content: space-between;
        align-items: flex-start;
        padding: 8px var(--mobile-content-padding) env(safe-area-inset-bottom);
        z-index: 1100;
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    }
    
    .quiz-nav-button {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 8px;
        border: none;
        background: none;
        color: var(--text-secondary);
        font-size: 0.75rem;
        text-decoration: none;
        cursor: pointer;
        transition: all 0.2s ease;
        position: relative;
        min-height: 44px;
    }
    
    .quiz-nav-button:active {
        transform: scale(0.95);
    }
    
    .quiz-nav-button.active,
    .quiz-nav-button:active {
        color: var(--mobile-primary);
    }
    
    .quiz-nav-button i {
        font-size: 1.25rem;
        margin-bottom: 2px;
    }
    
    .quiz-nav-button.mark.marked {
        color: var(--mobile-warning);
    }
    
    .quiz-nav-button.submit {
        color: var(--mobile-success);
        font-weight: 600;
    }
    
    .quiz-nav-button:disabled {
        opacity: 0.4;
        cursor: not-allowed;
    }
    
    /* Answer Display for Mobile */
    .mobile-answer-section {
        margin-top: 24px;
        padding: 16px;
        background: var(--mobile-bg-secondary);
        border-radius: 12px;
        border: 2px solid var(--mobile-success);
        animation: slideUp 0.3s ease;
    }
    
    .mobile-answer-section h6 {
        color: var(--mobile-success);
        font-weight: 600;
        margin-bottom: 8px;
        font-size: 1rem;
    }
    
    .mobile-answer-section p {
        margin: 0;
        font-size: 0.9375rem;
        line-height: 1.5;
        color: var(--text-primary);
    }
    
    /* AI Assistant Button */
    .mobile-ai-fab {
        position: fixed;
        bottom: calc(var(--mobile-nav-height) + 16px + env(safe-area-inset-bottom));
        right: 16px;
        width: 56px;
        height: 56px;
        border-radius: 50%;
        background: var(--mobile-primary);
        color: white;
        border: none;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 24px;
        z-index: 1000;
        transition: all 0.2s ease;
        cursor: pointer;
    }
    
    .mobile-ai-fab:active {
        transform: scale(0.95);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    }
    
    .mobile-ai-fab.pulse {
        animation: pulse 2s infinite;
    }
    
    @keyframes pulse {
        0% {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }
        50% {
            box-shadow: 0 4px 20px rgba(var(--mobile-primary), 0.4);
        }
        100% {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }
    }
    
    /* Animations */
    @keyframes slideUp {
        from {
            opacity: 0;
            transform: translateY(20px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    @keyframes fadeIn {
        from {
            opacity: 0;
        }
        to {
            opacity: 1;
        }
    }
    
    /* Landscape Mode Adjustments */
    @media (max-width: 991px) and (orientation: landscape) {
        .mobile-question-container {
            padding-top: calc(var(--mobile-header-height) + 8px);
            padding-bottom: calc(var(--mobile-nav-height) + 8px);
        }
        
        .mobile-options {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }
        
        .mobile-option-card {
            padding: 16px;
        }
        
        .option-letter {
            width: 36px;
            height: 36px;
            font-size: 1rem;
        }
        
        .option-text {
            font-size: 0.9375rem;
        }
    }
}

/* Dark Mode Support */
[data-theme="dark"] .quiz-header-mobile {
    background: #1a1a1a;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .mobile-stat {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .mobile-option-card {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .mobile-option-card.selected {
    background: rgba(var(--mobile-primary), 0.2);
}

[data-theme="dark"] .option-letter {
    background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .mobile-quiz-nav {
    background: #1a1a1a;
    border-top-color: rgba(255, 255, 255, 0.1);
}

/* Accessibility Enhancements */
@media (prefers-reduced-motion: reduce) {
    .mobile-option-card,
    .quiz-nav-button,
    .mobile-ai-fab {
        transition: none;
    }
    
    .mobile-progress-fill {
        transition: none;
    }
    
    @keyframes slideUp {
        from, to {
            opacity: 1;
            transform: none;
        }
    }
}