/* ==========================================
   CSS variables for themes and sizing
   ========================================== */
:root {
    /* Standard Theme Colors */
    --bg-primary: #f4f6f9;
    --bg-surface: #ffffff;
    --bg-header: #34495e;
    --text-header: #ffffff;
    --bg-subbar: #ebf0f5;
    --text-primary: #2c3e50;
    --text-muted: #7f8c8d;
    --accent-blue: #1b73e8;
    --accent-blue-hover: #155cb0;
    --border-color: #dcdde1;
    --yellow-highlight: #fff275;
    --review-color: #d1a3f0;
    --review-border: #9b59b6;
    
    /* Layout heights */
    --header-height: 60px;
    --subbar-height: 45px;
    --footer-height: 65px;
}

/* Theme modifications */
body.theme-inverted {
    --bg-primary: #121212;
    --bg-surface: #1e1e1e;
    --bg-header: #0d0d0d;
    --text-header: #e0e0e0;
    --bg-subbar: #242424;
    --text-primary: #e0e0e0;
    --text-muted: #aaaaaa;
    --accent-blue: #4285f4;
    --accent-blue-hover: #6ea5ff;
    --border-color: #3d3d3d;
    --yellow-highlight: #c0b200;
    --review-color: #3b2a47;
    --review-border: #bb86fc;
}

body.theme-contrast {
    --bg-primary: #000000;
    --bg-surface: #000000;
    --bg-header: #000000;
    --text-header: #ffff00;
    --bg-subbar: #111111;
    --text-primary: #ffff00;
    --text-muted: #ffff00;
    --accent-blue: #ffffff;
    --accent-blue-hover: #dddddd;
    --border-color: #ffff00;
    --yellow-highlight: #555500;
    --review-color: #222222;
    --review-border: #ffffff;
}

/* Font Sizing scale */
body.font-size-medium {
    --font-scale-base: 16px;
    --font-scale-h3: 18px;
    --font-scale-h2: 22px;
}
body.font-size-large {
    --font-scale-base: 20px;
    --font-scale-h3: 22px;
    --font-scale-h2: 26px;
}
body.font-size-xlarge {
    --font-scale-base: 24px;
    --font-scale-h3: 26px;
    --font-scale-h2: 30px;
}

/* ==========================================
   Base reset & scrollbars
   ========================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: var(--font-scale-base);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    user-select: text;
}

/* Customized scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ==========================================
   Header Component
   ========================================== */
.ielts-header {
    height: var(--header-height);
    background-color: var(--bg-header);
    color: var(--text-header);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    border-bottom: 2px solid var(--border-color);
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.ielts-logo {
    font-family: 'Outfit', sans-serif;
    font-size: 26px;
    font-weight: 700;
    color: var(--accent-blue);
    letter-spacing: 1px;
}

.candidate-info {
    display: flex;
    gap: 15px;
    font-size: 14px;
    opacity: 0.9;
}

.candidate-info span {
    border-right: 1px solid rgba(255,255,255,0.3);
    padding-right: 15px;
}
.candidate-info span:last-child {
    border-right: none;
}

.header-center {
    display: flex;
    justify-content: center;
}

.timer-box {
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    padding: 6px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s;
}

.timer-box:hover {
    background-color: rgba(0, 0, 0, 0.4);
}

.timer-label {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

.timer-value {
    font-family: monospace;
    font-size: 18px;
    font-weight: bold;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-btn {
    background-color: rgba(255, 255, 255, 0.1);
    color: inherit;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 6px 12px;
    font-size: 13px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: all 0.2s;
}

.header-btn:hover {
    background-color: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
}

/* Volume Slider Popover */
.volume-container {
    position: relative;
}
.volume-slider-popover {
    display: none;
    position: absolute;
    top: calc(100% + 5px);
    right: 0;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    z-index: 100;
}
.volume-container:hover .volume-slider-popover {
    display: block;
}
.volume-slider-popover input[type="range"] {
    width: 100px;
    cursor: pointer;
}

/* ==========================================
   Subbar Component
   ========================================== */
.simulator-subbar {
    height: var(--subbar-height);
    background-color: var(--bg-subbar);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    font-size: 14px;
}

.subbar-left {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ielts-select {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-surface);
    color: var(--text-primary);
    font-size: 13px;
    max-width: 450px;
    outline: none;
    cursor: pointer;
}

.mode-toggle-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-btn {
    padding: 4px 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.mode-btn.active {
    background-color: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

/* ==========================================
   Main Simulator Workspace Layout
   ========================================== */
.simulator-container {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* Sidebar Styling */
.simulator-sidebar {
    width: 320px;
    border-right: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

.sidebar-card {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 15px;
    background-color: var(--bg-primary);
}

.sidebar-card h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

.info-row {
    display: flex;
    margin-bottom: 8px;
    font-size: 13px;
}
.info-row .label {
    width: 60px;
    font-weight: 500;
    color: var(--text-muted);
}
.info-row span:last-child {
    flex: 1;
    word-break: break-all;
}

/* Custom Audio Player */
.audio-control-panel {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.audio-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background-color: var(--accent-blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    align-self: center;
    transition: transform 0.2s, background-color 0.2s;
}
.audio-btn:hover {
    background-color: var(--accent-blue-hover);
    transform: scale(1.05);
}

.audio-progress-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    font-family: monospace;
}

.audio-progress-container input[type="range"] {
    flex: 1;
    cursor: pointer;
    height: 4px;
}

.exam-audio-notice {
    font-size: 12px;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    margin-top: 8px;
}

/* Grading Results Panel */
.grading-card {
    border-color: #2ecc71;
    background-color: rgba(46, 204, 113, 0.05);
}
.score-display {
    text-align: center;
    font-size: 28px;
    font-weight: bold;
    color: #2ecc71;
    margin-bottom: 10px;
}

/* Primary Button Action */
.ielts-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}
.btn-primary {
    background-color: var(--accent-blue);
    color: white;
}
.btn-primary:hover {
    background-color: var(--accent-blue-hover);
}
.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}
.btn-secondary:hover {
    background-color: var(--bg-primary);
}

/* ==========================================
   Question Area Component
   ========================================== */
.question-sheet-area {
    flex: 1;
    background-color: var(--bg-primary);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.questions-viewport {
    flex: 1;
    overflow-y: auto;
    padding: 30px 40px;
}

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    font-style: italic;
}

/* Slide Cards styling */
.slide-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 25px;
    margin-bottom: 30px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.02);
}

.slide-card h2 {
    font-family: 'Outfit', sans-serif;
    font-size: var(--font-scale-h2);
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--accent-blue);
    border-bottom: 2px solid var(--bg-primary);
    padding-bottom: 8px;
}

.slide-text-container {
    line-height: 1.8;
}

.slide-text-container blockquote {
    padding-left: 15px;
    border-left: 3px solid var(--border-color);
    margin: 15px 0;
    color: var(--text-primary);
}

.slide-text-container p {
    margin-bottom: 12px;
}

/* Interactive custom blank input fields */
.ielts-input-wrapper {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin: 0 4px;
}
.ielts-input-num {
    font-weight: bold;
    color: var(--accent-blue);
    font-size: 14px;
}

.ielts-input {
    border: none;
    border-bottom: 2px solid #555;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    padding: 2px 8px;
    font-family: inherit;
    font-size: var(--font-scale-base);
    font-weight: 500;
    width: 140px;
    outline: none;
    border-radius: 2px;
    transition: all 0.2s;
}

.ielts-input:focus {
    background-color: #fff;
    border-bottom-color: var(--accent-blue);
    box-shadow: 0 2px 4px rgba(27, 115, 232, 0.1);
}

/* Styling for graded inputs */
.ielts-input.correct {
    background-color: rgba(46, 204, 113, 0.15) !important;
    border-bottom-color: #2ecc71 !important;
}
.ielts-input.incorrect {
    background-color: rgba(231, 76, 60, 0.15) !important;
    border-bottom-color: #e74c3c !important;
}

.graded-answer-hint {
    display: block;
    font-size: 12px;
    color: #2ecc71;
    font-weight: 500;
    margin-top: 2px;
    padding-left: 2px;
}
.graded-answer-hint.wrong {
    color: #e74c3c;
}

/* Interactive Multiple Choice Options styling */
.mcq-container {
    margin: 15px 0 15px 15px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.mcq-option {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}
.mcq-option:hover {
    background-color: var(--bg-primary);
}
.mcq-option input[type="radio"] {
    margin-top: 4px;
    cursor: pointer;
}
.mcq-option.selected {
    border-color: var(--accent-blue);
    background-color: rgba(27, 115, 232, 0.05);
}
.mcq-option.correct {
    border-color: #2ecc71 !important;
    background-color: rgba(46, 204, 113, 0.1) !important;
}
.mcq-option.incorrect {
    border-color: #e74c3c !important;
    background-color: rgba(231, 76, 60, 0.1) !important;
}

/* Custom highlight class */
.highlight-yellow {
    background-color: var(--yellow-highlight);
}

/* ==========================================
   Footer Component (Question Grid navigation)
   ========================================== */
.ielts-footer {
    height: var(--footer-height);
    background-color: var(--bg-subbar);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    z-index: 10;
    width: 100%;
}

.footer-btn {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
    flex-shrink: 0;
}
.footer-btn:hover {
    background-color: var(--border-color);
}

/* Question Grid (1-40) */
.footer-center {
    flex: 1;
    min-width: 0;
    display: flex;
    justify-content: center;
    overflow: hidden;
    padding: 0 10px;
}

.nav-grid {
    display: flex;
    gap: 6px;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 5px 0;
    flex-wrap: nowrap;
    scrollbar-width: none;
}
.nav-grid::-webkit-scrollbar {
    display: none;
}

.nav-item {
    flex: 0 0 32px;
    width: 32px;
    height: 32px;
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    user-select: none;
    transition: all 0.2s;
}

.nav-item:hover {
    border-color: var(--text-primary);
}

/* Underline for Answered */
.nav-item.answered::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 4px;
    right: 4px;
    height: 3px;
    background-color: var(--accent-blue);
    border-radius: 1px;
}

/* Circular border for Review flagged questions */
.nav-item.review {
    border-radius: 50% !important;
    border: 2px solid var(--review-border) !important;
    background-color: var(--review-color);
}

/* Active Highlight */
.nav-item.active {
    background-color: var(--accent-blue) !important;
    color: white !important;
    border-color: var(--accent-blue) !important;
}

/* Review Checkbox custom container */
.review-checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-right: 15px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
}
.review-checkbox-label input {
    cursor: pointer;
}

/* ==========================================
   Modals
   ========================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex;
}

.modal-content {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 500px;
    max-width: 90vw;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    overflow: hidden;
    animation: modalSlide 0.3s ease;
}

@keyframes modalSlide {
    from { transform: translateY(-30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h2 {
    font-size: 18px;
    font-weight: 600;
}
.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}

.modal-body {
    padding: 20px;
}

.settings-group {
    margin-bottom: 20px;
}
.settings-group h3 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.settings-options {
    display: flex;
    gap: 10px;
}
.settings-opt-btn {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}
.settings-opt-btn.active {
    border-color: var(--accent-blue);
    background-color: var(--accent-blue);
    color: white;
}

.modal-body ul {
    margin-left: 20px;
    margin-top: 10px;
    margin-bottom: 10px;
}
.modal-body li {
    margin-bottom: 8px;
    line-height: 1.5;
}

/* Screen Hiding Overlay */
.hiding-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #2b3e50;
    color: white;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
}
.overlay-content h2 {
    font-size: 28px;
    margin-bottom: 15px;
    font-family: 'Outfit', sans-serif;
}
.overlay-content p {
    font-size: 16px;
    opacity: 0.8;
}

/* ==========================================
   Responsive & Mobile Overrides
   ========================================== */
#sidebar-toggle-btn {
    display: none;
}

@media (max-width: 1024px) {
    #sidebar-toggle-btn {
        display: flex !important;
    }
    
    .ielts-logo {
        font-size: 22px;
    }
    
    .simulator-sidebar {
        position: fixed;
        left: -320px;
        top: var(--header-height);
        bottom: var(--footer-height);
        height: calc(100vh - var(--header-height) - var(--footer-height));
        z-index: 1000;
        transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 5px 0 15px rgba(0,0,0,0.15);
        background-color: var(--bg-surface);
        border-right: 1px solid var(--border-color);
    }
    
    .simulator-sidebar.active {
        left: 0;
    }
    
    /* Overlay for mobile drawer */
    .drawer-overlay {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: var(--footer-height);
        background-color: rgba(0,0,0,0.4);
        z-index: 999;
    }
    .drawer-overlay.active {
        display: block;
    }
}

@media (max-width: 768px) {
    .candidate-info {
        display: none;
    }
    
    .ielts-header {
        padding: 0 10px;
    }
    
    .header-right {
        gap: 4px;
    }
    
    .header-btn {
        padding: 6px 8px;
        font-size: 11px;
    }
    
    .timer-box {
        padding: 4px 10px;
        gap: 4px;
    }
    
    .timer-label {
        display: none;
    }
    
    .timer-value {
        font-size: 15px;
    }
    
    .simulator-subbar {
        height: auto;
        min-height: var(--subbar-height);
        flex-direction: column;
        align-items: stretch;
        padding: 10px;
        gap: 8px;
    }
    
    .subbar-left, .subbar-right {
        width: 100%;
        justify-content: space-between;
        gap: 10px;
    }
    
    .ielts-select {
        max-width: 100%;
        flex: 1;
    }
    
    .questions-viewport {
        padding: 15px;
    }
    
    .slide-card {
        padding: 15px;
        margin-bottom: 20px;
    }
    
    .ielts-footer {
        padding: 0 10px;
    }
    
    .footer-btn span {
        display: none;
    }
    
    .review-checkbox-label {
        margin-right: 5px;
        font-size: 12px;
    }
}

@media (max-width: 480px) {
    .footer-center {
        padding: 0 5px;
    }
    .nav-grid {
        gap: 4px;
    }
    .nav-item {
        min-width: 28px;
        height: 28px;
        font-size: 11px;
        flex: 0 0 28px;
    }
}

/* Fallback Questions cards style */
.fallback-question-card {
    border: 1px dashed var(--accent-blue);
    background-color: rgba(27, 115, 232, 0.02);
    padding: 15px;
    border-radius: 6px;
    margin-top: 15px;
}
.fallback-questions-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 10px;
}

/* Shared option banks extracted from OCR slides (e.g. What TWO… A–E) */
.option-bank-panel {
    margin-top: 14px;
    padding: 12px 14px;
    border: 1px solid rgba(27, 115, 232, 0.25);
    border-radius: 8px;
    background: rgba(27, 115, 232, 0.04);
}
.option-bank-prompt {
    margin: 0 0 10px;
    font-size: 0.95rem;
    line-height: 1.4;
}
.option-bank-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.option-bank-item {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    padding: 6px 8px;
    border-radius: 4px;
    background: var(--card-bg, #fff);
}
.option-bank-item .mcq-letter {
    font-weight: 700;
    min-width: 1.2em;
    color: var(--accent-blue, #1b73e8);
}
.option-plain {
    opacity: 0.85;
    font-size: 0.92rem;
}