/* ============================================
   EXAM ENGINE STYLES
   All classes prefixed with -exam-
   Includes: Scientific Calculator, Instructions,
   Countdown, Warning Modal
   ============================================ */

/* ---------- OVERLAY ---------- */
.-exam-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100dvh;
    z-index: 10000;
    background: var(--bg-primary);
    opacity: 0;
    visibility: hidden;
    transform: scale(0.95);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    overflow: hidden;
    will-change: transform, opacity;
}

.-exam-overlay.-exam-active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

/* Content wrapper */
.-exam-overlay-content {
    position: relative;
    z-index: 1;
    height: 100%;
    display: flex;
    flex-direction: column;
    background: linear-gradient(to bottom,
            transparent 0%,
            var(--bg-primary) 30%,
            var(--bg-primary) 100%);
}

/* ---------- STAGES ---------- */
.-exam-stage {
    display: none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    flex-direction: column;
    opacity: 0;
    transform: scale(0.95);
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 1;
    overflow: hidden;
}

.-exam-stage.-exam-stage-active {
    display: flex;
    opacity: 1;
    transform: scale(1);
    z-index: 2;
}

.-exam-stage-scroll {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 24px 32px 24px;
    width: 100%;
    min-height: 0;
}

/* ---------- TOP BAR ---------- */
.-exam-top-bar,
.-exam-interface-top-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: calc(var(--safe-top) + 8px) 16px 8px 16px;
    flex-shrink: 0;
    z-index: 3;
}

.-exam-back-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    flex-shrink: 0;
    color: var(--text-primary);
}

.-exam-back-btn:hover {
    background-color: var(--bg-hover);
}

.-exam-back-btn .material-icons-round {
    font-size: 2rem;    color: var(--text-primary);
    pointer-events: none;
}

.-exam-top-title {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-primary);
    flex: 1;
}

/* ---------- MODE SELECTION ---------- */
.-exam-mode-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 24px 0;
    text-align: center;
}

.-exam-mode-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 20px;
    margin-bottom: 8px;
}

.-exam-mode-icon .material-icons-round {
    font-size: 3rem;    color: #ffffff;
}

.-exam-mode-title {
    font-size: 2.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.-exam-mode-subject {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.-exam-mode-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: .95rem;
    color: var(--text-tertiary);
}

.-exam-meta-divider {
    width: 3px;
    height: 3px;
    background: var(--text-tertiary);
    border-radius: 50%;
}

.-exam-mode-selection {
    margin-top: 16px;
}

.-exam-mode-selection-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.-exam-mode-btn {
    display: inline-flex;
    width: 100%;
    max-width: 600px;
    align-items: center;
    gap: 16px;
    padding: 20px;
    border-radius: 16px;
    border: 2px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-base);
    font-family: 'Poppins', sans-serif;
    margin-bottom: 12px;
    position: relative;
    overflow: hidden;
    background: transparent;
}

.-exam-mode-btn:hover {
    transform: translateY(-2px);
}

.-exam-mode-btn:active {
    transform: scale(0.97);
}

.-exam-practice-btn {
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.08) 0%, transparent 50%);
    border-color: rgba(76, 175, 80, 0.3);
}

.-exam-exam-btn {
    background: linear-gradient(135deg, rgba(244, 67, 54, 0.08) 0%, transparent 50%);
    border-color: rgba(244, 67, 54, 0.3);
}

.-exam-mode-btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    min-width: 56px;
    border-radius: 50%;
    flex-shrink: 0;
}

.-exam-practice-btn .-exam-mode-btn-icon {
    background: rgba(0, 0, 0, 0);
}

.-exam-exam-btn .-exam-mode-btn-icon {
    background: rgba(244, 67, 54, 0);
}

.-exam-practice-btn .-exam-mode-btn-icon .material-icons-round {
    font-size: 2.25rem;    color: var(--text-primary);
}

.-exam-exam-btn .-exam-mode-btn-icon .material-icons-round {
    font-size: 2.25rem;    color: var(--text-primary);
}

.-exam-mode-btn-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    text-align: left;
}

.-exam-mode-btn-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.-exam-mode-btn-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.-exam-mode-btn-arrow {
    font-size: 2rem;    color: var(--text-tertiary);
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.-exam-mode-btn:hover .-exam-mode-btn-arrow {
    transform: translateX(4px);
}

/* ---------- EXAM CONFIG ---------- */
.-exam-config-content {
    max-width: 500px;
    margin: 0 auto;
    padding: 16px 0;
    padding-bottom: 5rem;
}

.-exam-config-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    text-align: center;
}

.-exam-config-section {
    margin-bottom: 32px;
}

.-exam-config-label {
    display: block;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.-exam-config-input-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
}

.-exam-config-number-input {
    width: 100%;
    padding: 14px 16px;
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
}

.-exam-config-number-input:focus {
    border-color: var(--accent-color);
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring);
}

.-exam-config-max-hint {
    font-size: 0.9rem;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.-exam-time-control-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.-exam-time-control-btn {
    padding: 14px;
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
    text-align: center;
}

.-exam-time-control-btn:hover {
    border-color: var(--text-primary);
    background: var(--bg-hover);
}

.-exam-time-control-btn.-exam-selected {
    border-color: var(--accent-color);
    background: #dcdcdc33;
    color: var(--text-primary);
}

.-exam-start-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 16px;
    background: var(--accent-color);
    border: none;
    border-radius: 24px;
    cursor: pointer;
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
    margin-top: 8px;
}

.-exam-start-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

/* ---------- QUIZ INTERFACE ---------- */
.-exam-interface-top-bar {
    gap: 8px;
    padding: calc(var(--safe-top) + 4px) 12px 4px 12px;
}

.-exam-progress-bar {
    flex: 1;
    height: 6px;
    background: var(--bg-elevated);
    border-radius: 3px;
    overflow: hidden;
    margin: 0 8px;
    cursor: pointer;
}

.-exam-progress-fill {
    height: 100%;
    background: var(--accent-color);
    border-radius: 3px;
    transition: width 0.3s ease;
    width: 0%;
}

.-exam-timer {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    flex-shrink: 0;
}

.-exam-timer .material-icons-round {
    font-size: 1.5rem;    color: var(--accent-color);
}

.-exam-timer-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.-exam-tool-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid var(--border-color);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.-exam-tool-btn:hover {
    background: var(--bg-hover);
    border-color: var(--text-primary);
    color: var(--text-primary);
}

.-exam-tool-btn .material-icons-round {
    font-size: 1.75rem;    pointer-events: none;
}

.-exam-question-counter {
    text-align: center;
    padding: 8px 0;
    flex-shrink: 0;
}

.-exam-question-counter-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.-exam-question-swipe-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.-exam-question-content {
    height: 100%;
    overflow-y: auto;
    padding: 16px 24px;
    -webkit-overflow-scrolling: touch;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.-exam-question-content * {
    font-size: 1.4rem!important;
}

.-exam-question-text {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 20px;
}

.-exam-options-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.-exam-option-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--bg-surface);
    border: 2px solid var(--divider-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: 'Poppins', sans-serif;
    text-align: left;
    width: 100%;
}

.-exam-option-btn:hover {
    border-color: var(--border-color);
    background: var(--bg-hover);
}

.-exam-option-btn.-exam-selected {
    background: var(--text-primary);
    color: var(--bg-primary);
    border: 2px solid var(--bg-primary);
}

.-exam-option-btn.-exam-selected * {
    color: var(--bg-primary)!important;
}

.-exam-option-btn.-exam-correct {
    border-color: #4caf50;
    background: rgba(76, 175, 80, 0.1);
}

.-exam-option-btn.-exam-incorrect {
    border-color: #f44336;
    background: rgba(244, 67, 54, 0.1);
}

.-exam-option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    min-width: 32px;
    border-radius: 50%;
    background: var(--bg-elevated);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.-exam-option-btn.-exam-selected .-exam-option-letter {
    color: var(--text-primary)!important;
}

.-exam-option-btn.-exam-correct .-exam-option-letter {
    background: #4caf50;
    color: #ffffff;
}

.-exam-option-btn.-exam-incorrect .-exam-option-letter {
    background: #f44336;
    color: #ffffff;
}

.-exam-option-text {
    flex: 1;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.-exam-explanation-box {
    margin-top: 16px;
    padding: 16px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    display: none;
}

.-exam-explanation-box.-exam-show {
    display: block;
    animation: fadeIn 0.3s ease;
}

.-exam-explanation-box.-exam-correct {
    border-color: rgba(76, 175, 80, 0.4);
    background: rgba(76, 175, 80, 0.05);
}

.-exam-explanation-box.-exam-incorrect {
    border-color: rgba(244, 67, 54, 0.4);
    background: rgba(244, 67, 54, 0.05);
}

.-exam-explanation-title {
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.-exam-explanation-box.-exam-correct .-exam-explanation-title {
    color: #4caf50;
}

.-exam-explanation-box.-exam-incorrect .-exam-explanation-title {
    color: #f44336;
}

.-exam-explanation-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.-exam-navigation {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-top: 1px solid var(--divider-color);
    flex-shrink: 0;
}

.-exam-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 12px 16px;
    border-radius: .4rem;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
    flex: 1;
    background: transparent;
}

.-exam-prev-btn,
.-exam-next-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.-exam-prev-btn:hover,
.-exam-next-btn:hover {
    background: var(--bg-hover);
}

.-exam-submit-btn {
    background: var(--accent-color);
    border: none;
    color: #ffffff;
}

.-exam-submit-btn:hover {
    background: var(--accent-hover);
}

.-exam-nav-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.-exam-nav-btn .material-icons-round {
    font-size: 1.625rem;    pointer-events: none;
}

/* ---------- QUIZ MAP MODAL ---------- */
.-exam-map-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10001;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.-exam-map-overlay.-exam-active {
    opacity: 1;
    visibility: visible;
}

.-exam-map-content {
    background: var(--bg-surface);
    border-radius: 16px;
    width: 90%;
    max-width: 400px;
    max-height: 70vh;
    overflow-y: auto;
    padding: 20px;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.-exam-map-overlay.-exam-active .-exam-map-content {
    transform: scale(1);
}

.-exam-map-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.-exam-map-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.-exam-map-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.-exam-map-close-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.-exam-map-close-btn .material-icons-round {
    font-size: 1.75rem;    pointer-events: none;
}

.-exam-map-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.-exam-map-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--bg-elevated);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    font-family: 'Poppins', sans-serif;
}

.-exam-map-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-color);
}

.-exam-map-btn.-exam-current {
    border-color: var(--accent-color);
    background: var(--accent-light);
    color: var(--accent-color);
}

.-exam-map-btn.-exam-answered {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #ffffff;
}

/* ---------- CALCULATOR MODAL ---------- */
.-exam-calculator-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10001;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.-exam-calculator-overlay.-exam-active {
    opacity: 1;
    visibility: visible;
}

.-exam-calculator-content {
    background: var(--bg-surface);
    border-radius: 16px;
    width: 90%;
    max-width: 380px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
    padding: 16px;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.-exam-calculator-overlay.-exam-active .-exam-calculator-content {
    transform: scale(1);
}

.-exam-calculator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.-exam-calculator-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.-exam-calculator-close-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.-exam-calculator-close-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.-exam-calculator-close-btn .material-icons-round {
    font-size: 1.625rem;    pointer-events: none;
}

/* Display */
.-exam-calculator-display-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--bg-elevated);
    border-radius: 8px;
    padding: 0 12px;
    min-height: 40px;
    flex-shrink: 0;
}

.-exam-calculator-display {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-family: 'Poppins', monospace;
    text-align: right;
    padding: 8px 0;
    min-width: 0;
    letter-spacing: 0.5px;
    caret-color: transparent;
}

.-exam-calculator-cursor {
    display: inline-block;
    width: 2px;
    height: 1.2rem;
    background: var(--accent-color);
    margin-left: 2px;
    animation: examCalcCursorBlink 1s step-end infinite;
    flex-shrink: 0;
}

@keyframes examCalcCursorBlink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

/* Buttons grid */
.-exam-calculator-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 6px;
    flex-shrink: 0;
}

.-exam-calc-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-elevated);
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    font-family: 'Poppins', sans-serif;
    padding: .4rem 0;
    min-width: 0;
    min-height: 0;
}

.-exam-calc-btn:hover {
    background: var(--bg-hover);
    border-color: var(--accent-color);
}

.-exam-clear-btn {
    background: rgba(244, 67, 54, 0.1);
    border-color: rgba(244, 67, 54, 0.3);
    color: var(--accent-color);
}

.-exam-del-btn {
    background: rgba(255, 152, 0, 0.1);
    border-color: rgba(255, 152, 0, 0.3);
    color: #ff9800;
}

.-exam-operator-btn {
    background: var(--accent-light);
    border-color: rgba(244, 67, 54, 0.3);
    color: var(--accent-color);
}

.-exam-sci-btn {
    font-size: 0.85rem;
    font-weight: 600;
    background: rgba(33, 150, 243, 0.1);
    border-color: rgba(33, 150, 243, 0.3);
    color: #2196f3;
}

.-exam-sci-btn:hover {
    background: rgba(33, 150, 243, 0.2);
    border-color: #2196f3;
}

.-exam-equals-btn {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #ffffff;
    grid-column: span 2;
    aspect-ratio: auto;
}

/* Height-based scaling - no scroll until 300px */
@media (max-height: 500px) {
    .-exam-calculator-content {
        padding: 10px;
        gap: 6px;
        border-radius: 10px;
    }
    
    .-exam-calculator-display-wrapper {
        min-height: 32px;
        padding: 0 10px;
    }
    
    .-exam-calculator-display {
        font-size: 0.85rem;
        padding: 4px 0;
    }
    
    .-exam-calculator-buttons {
        gap: 4px;
    }
    
    .-exam-calc-btn {
        font-size: 0.85rem;
        border-radius: 4px;
    }
    
    .-exam-sci-btn {
        font-size: 0.85rem;
    }
}

@media (max-height: 400px) {
    .-exam-calculator-content {
        padding: 8px;
        gap: 4px;
    }
    
    .-exam-calculator-display-wrapper {
        min-height: 28px;
    }
    
    .-exam-calculator-display {
        font-size: 0.75rem;
    }
    
    .-exam-calc-btn {
        font-size: 0.85rem;
    }
    
    .-exam-sci-btn {
        font-size: 0.85rem;
    }
}

@media (max-height: 300px) {
    .-exam-calculator-content {
        padding: 6px;
        gap: 2px;
        overflow-y: auto;
    }
}
/* ---------- EXIT MODAL ---------- */
.-exam-exit-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10002;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.-exam-exit-modal-overlay.-exam-active {
    opacity: 1;
    visibility: visible;
}

.-exam-exit-modal {
    background: var(--bg-surface);
    border-radius: 16px;
    width: 90%;
    max-width: 360px;
    padding: 24px;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.-exam-exit-modal-overlay.-exam-active .-exam-exit-modal {
    transform: scale(1);
}

.-exam-exit-modal-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(255, 152, 0, 0.15);
    margin: 0 auto 16px auto;
}

.-exam-exit-modal-icon .material-icons-round {
    font-size: 2.5rem;    color: #ff9800;
}

.-exam-exit-modal-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.-exam-exit-modal-message {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.-exam-exit-modal-buttons {
    display: flex;
    gap: 12px;
}

.-exam-exit-btn {
    flex: 1;
    padding: 12px;
    border-radius: 24px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
}

.-exam-cancel-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.-exam-cancel-btn:hover {
    background: var(--bg-hover);
}

.-exam-confirm-btn {
    background: var(--accent-color);
    border: none;
    color: #ffffff;
}

.-exam-confirm-btn:hover {
    background: var(--accent-hover);
}

/* ---------- RESULTS ---------- */
.-exam-results-content {
    max-width: 1700px;
    margin: 0 auto;
    padding: 16px 0;
}

.-exam-results-summary {
    text-align: center;
    padding: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 16px;
    margin-bottom: 24px;
}

.-exam-results-score {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
}

.-exam-results-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.-exam-results-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 16px;
}

.-exam-result-stat {
    text-align: center;
}

.-exam-result-stat-value {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--text-primary);
}

.-exam-result-stat-label {
    font-size: 0.9rem;
    color: var(--text-tertiary);
}

.-exam-results-question-card {
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
}

.-exam-results-question-card.-exam-correct {
    border-left: 0px solid #4caf50;
}

.-exam-results-question-card.-exam-incorrect {
    border-left: 0px solid #f44336;
}

.-exam-results-question-card.-exam-skipped {
    border-left: 0px solid #ff9800;
}

.-exam-results-question-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.-exam-results-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 8px;
    margin-bottom: 6px;
    font-size: 1.05rem;
}

.-exam-results-option.-exam-correct-answer {
    background: rgba(76, 175, 80, 0.1);
    color: #4caf50;
    font-weight: 600;
}

.-exam-results-option.-exam-wrong-answer {
    background: rgba(244, 67, 54, 0.1);
    color: #f44336;
}

.-exam-results-option.-exam-user-answer {
    border: none;
}

.-exam-results-explanation {
    margin-top: 12px;
    padding: 12px 0;
    border-radius: 8px;
    font-size: 1.05rem;
    color: var(--text-primary);
}

/* ---------- EXAM INSTRUCTIONS ---------- */
.-exam-instructions-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 16px 0;
    padding-bottom: 5rem;
}

.-exam-instructions-icon {
    display: none;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--accent-light);
    margin: 24px auto;
}

.-exam-instructions-icon .material-icons-round {
    font-size: 3rem;    color: var(--accent-color);
}

.-exam-instructions-title {
    text-align: center;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.-exam-instructions-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 32px;
}

.-exam-instruction-item {
    display: flex;
    gap: 16px;
    padding: 16px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 12px;
}

.-exam-instruction-item > .material-icons-round {
    font-size: 2rem;    color: var(--text-primary);
    flex-shrink: 0;
}

.-exam-instruction-item strong {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.-exam-instruction-item p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.-exam-begin-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 16px;
    background: var(--accent-color);
    border: none;
    border-radius: 24px;
    cursor: pointer;
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
}

.-exam-begin-btn:hover {
    background: var(--accent-hover);
    transform: scale(1.02);
}

.-exam-begin-btn .material-icons-round {
    font-size: 1.75rem;    pointer-events: none;
}

/* ---------- WARNING MODAL ---------- */
.-exam-warning-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 10006;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.-exam-warning-overlay.active {
    opacity: 1;
    visibility: visible;
}

.-exam-warning-content {
    background: var(--bg-surface);
    border-radius: 16px;
    width: 90%;
    max-width: 360px;
    padding: 24px;
    text-align: center;
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.-exam-warning-overlay.active .-exam-warning-content {
    transform: scale(1);
}

.-exam-warning-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: rgba(255, 152, 0, 0.15);
    margin: 0 auto 16px auto;
}

.-exam-warning-icon .material-icons-round {
    font-size: 2.5rem;    color: #ff9800;
}

.-exam-warning-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.-exam-warning-message {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.-exam-warning-btn {
    padding: 12px 24px;
    background: var(--accent-color);
    border: none;
    border-radius: 24px;
    cursor: pointer;
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    transition: all var(--transition-fast);
}

.-exam-warning-btn:hover {
    background: var(--accent-hover);
}

/* ---------- COUNTDOWN OVERLAY ---------- */
.-exam-countdown-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 10005;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.-exam-countdown-overlay.active {
    opacity: 1;
    visibility: visible;
}

.-exam-countdown-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 40px;
    background: var(--bg-surface);
    border: 1px solid var(--divider-color);
    border-radius: 24px;
    text-align: center;
    transform: scale(0.8);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.-exam-countdown-overlay.active .-exam-countdown-content {
    transform: scale(1);
}

.-exam-countdown-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: examCountdownIconPulse 1s ease infinite;
}

.-exam-countdown-icon .material-icons-round {
    font-size: 3rem;    color: var(--accent-color);
}

.-exam-countdown-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    animation: examCountdownFadeIn 0.5s ease;
}

.-exam-countdown-number {
    font-size: 5rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
}

.-exam-countdown-number.-exam-pulse {
    animation: examCountdownNumberPulse 1s ease;
}

.-exam-countdown-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    animation: examCountdownFadeIn 0.5s ease;
}

@keyframes examCountdownIconPulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(244, 67, 54, 0.3); }
    50% { transform: scale(1.05); box-shadow: 0 0 0 20px rgba(244, 67, 54, 0); }
}

@keyframes examCountdownNumberPulse {
    0% { transform: scale(1.5); opacity: 0; }
    30% { transform: scale(1); opacity: 1; }
    80% { transform: scale(1); opacity: 1; }
    100% { transform: scale(0.8); opacity: 0.7; }
}

@keyframes examCountdownFadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ---------- RESPONSIVE ---------- */
@media (min-width: 711px) {
    .-exam-stage-scroll,
    .-exam-question-content {
        margin: 0 auto;
        width: 100%;
    }

    .-exam-navigation,
    .-exam-interface-top-bar,
    .-exam-question-counter {
        margin-left: auto;
        margin-right: auto;
        width: 100%;
    }

    .-exam-time-control-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (min-width: 711px) and (max-width: 1024px) {
    .-exam-stage-scroll,
    .-exam-question-content {
        max-width: none;
    }

    .-exam-time-control-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 710px) {
    .-exam-stage-scroll {
        padding: 0 .5rem 24px .5rem;
    }

    .-exam-progress-bar {
        display: none;
    }

    .-exam-interface-top-bar {
        padding: calc(var(--safe-top) + 4px) 8px 4px 8px;
    }

    .-exam-mode-icon {
        width: 64px;
        height: 64px;
        border-radius: 16px;
    }

    .-exam-mode-icon .material-icons-round {
        font-size: 2.5rem;    }

    .-exam-mode-title {
        font-size: 1.4rem;
    }

    .-exam-mode-btn {
        padding: 16px;
        gap: 12px;
    }

    .-exam-mode-btn-icon {
        width: 44px;
        height: 44px;
        min-width: 44px;
    }

    .-exam-mode-btn-icon .material-icons-round {
        font-size: 1.875rem;    }

    .-exam-question-content {
        padding: 12px 0.5rem;
    }

    .-exam-question-content * {
    font-size: 1.2rem!important;
}

    .-exam-question-text {
        font-size: 1rem;
    }

    .-exam-option-btn {
        padding: 12px;
        gap: 10px;
    }

    .-exam-option-letter {
        width: 28px;
        height: 28px;
        min-width: 28px;
        font-size: 0.75rem;
    }

    .-exam-option-text {
        font-size: 0.85rem;
    }

    .-exam-navigation {
        padding: 1.4rem .6rem;
        padding-bottom: calc(var(--safe-bottom) + .3rem);
        gap: 3px;
    }

    .-exam-nav-btn {
        padding: 10px;
        font-size: 0.85rem;
    }

    .-exam-nav-btn .material-icons-round {
        font-size: 1.5rem;    }

    .-exam-time-control-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .-exam-time-control-btn {
        padding: 12px;
        font-size: 0.95rem;
    }

    .-exam-map-content,
    .-exam-calculator-content {
        width: 95%;
        padding: 16px;
    }

    .-exam-calculator-content {
        max-width: 100%;
        max-height: 90vh;
    }

    .-exam-calc-btn {
        font-size: 0.85rem;
    }

    .-exam-sci-btn {
        font-size: 0.85rem;
    }

    .-exam-countdown-content {
        padding: 32px 24px;
        border-radius: 20px;
        gap: 12px;
    }

    .-exam-countdown-icon {
        width: 64px;
        height: 64px;
    }

    .-exam-countdown-icon .material-icons-round {
        font-size: 2.5rem;    }

    .-exam-countdown-number {
        font-size: 4rem;
    }

    .-exam-countdown-title {
        font-size: 1rem;
    }

    .-exam-instructions-icon {
        width: 64px;
        height: 64px;
        margin: 16px auto;
    }

    .-exam-instructions-icon .material-icons-round {
        font-size: 2.5rem;    }

    .-exam-instructions-title {
        font-size: 1.1rem;
    }

    .-exam-instruction-item {
        padding: 12px;
        gap: 12px;
    }
}

/* ============================================
   EXAM OFFLINE MODAL (NEW)
   ============================================ */

.-exam-offline-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10050;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    padding: 20px;
}

.-exam-offline-modal-overlay.-exam-active {
    opacity: 1;
    pointer-events: auto;
}

.-exam-offline-modal {
    background: var(--bg-primary, #030303);
    border: 1px solid var(--divider-color, #272727);
    border-radius: 20px;
    padding: 32px 28px 28px;
    width: 100%;
    max-width: 380px;
    text-align: center;
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.6);
    transform: scale(0.9) translateY(10px);
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Poppins', sans-serif;
}

.-exam-offline-modal-overlay.-exam-active .-exam-offline-modal {
    transform: scale(1) translateY(0);
}

.-exam-offline-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: rgba(244, 67, 54, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
}

.-exam-offline-icon .material-icons-round {
    font-size: 36px;
    color: #f44336;
}

.-exam-offline-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary, #ffffff);
    margin: 0 0 8px;
    letter-spacing: -0.01em;
}

.-exam-offline-message {
    font-size: 0.95rem;
    line-height: 1.55;
    color: var(--text-secondary, #aaaaaa);
    margin: 0 0 24px;
}

.-exam-offline-buttons {
    display: flex;
    gap: 10px;
}

.-exam-offline-btn {
    flex: 1;
    padding: 12px 16px;
    border-radius: 12px;
    border: none;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.15s ease, opacity 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.-exam-offline-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.-exam-offline-stay {
    background: var(--bg-elevated, #212121);
    color: var(--text-primary, #ffffff);
}

.-exam-offline-stay:hover:not(:disabled) {
    background: var(--bg-hover, #272727);
}

.-exam-offline-retry {
    background: #f44336;
    color: #ffffff;
}

.-exam-offline-retry:hover:not(:disabled) {
    background: #e53935;
}

.-exam-offline-retry .material-icons-round {
    font-size: 18px;
    animation: -exam-offline-spin 1s linear infinite;
}

@keyframes -exam-offline-spin {
    to { transform: rotate(360deg); }
}

/* Mobile tweaks */
@media (max-width: 380px) {
    .-exam-offline-modal {
        padding: 28px 20px 24px;
    }
    .-exam-offline-title {
        font-size: 1.2rem;
    }
    .-exam-offline-message {
        font-size: 0.9rem;
    }
    .-exam-offline-buttons {
        flex-direction: column-reverse;
    }
}

/* ---------- iOS Safari bottom-toolbar guard ---------- */
/* iOS Safari's floating bottom bar overlaps anything pinned to bottom: 0.
   Add extra space so the nav buttons sit above it. */
@supports (-webkit-touch-callout: none) {
    .-exam-navigation {
        padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 1rem) !important;
    }
    .-exam-navigation button,
    .-exam-navigation .-exam-nav-btn {
        min-height: 52px;
    }
}