:root {
    --bg-page: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --border-focus: #2563eb;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-sub: #475569;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --success: #16a34a;
    --success-light: #f0fdf4;
    --danger: #dc2626;
    --danger-light: #fef2f2;
    --warning: #d97706;
    --warning-light: #fffbeb;
    --radius-sharp: 4px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    -webkit-tap-highlight-color: transparent;
}

body.light-mode {
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
}

.reading-app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

                                                            
                                                    
                                                               
.reading-top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: #ffffff;
    border-bottom: 1px solid var(--border-color);
    height: 60px;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    box-shadow: var(--shadow-sm);
}

.bar-left {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
}

.nav-back-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    background-color: #f1f5f9;
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sharp);
    border: 1px solid #cbd5e1;
    transition: all 0.15s ease;
}

.nav-back-pill:hover {
    background-color: #e2e8f0;
    color: var(--primary);
}

.brand-divider {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
}

.test-identity .exam-tag {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background-color: #f1f5f9;
    color: #475569;
    padding: 4px 10px;
    border-radius: var(--radius-sharp);
    border: 1px solid #cbd5e1;
}

.bar-center {
    flex: 1;
    max-width: 460px;
    display: flex;
    justify-content: center;
}

.test-switcher-wrap {
    width: 100%;
    position: relative;
    display: flex;
    align-items: center;
}

.switcher-icon {
    position: absolute;
    left: 12px;
    color: #64748b;
    font-size: 0.85rem;
    pointer-events: none;
}

.test-select-dropdown {
    width: 100%;
    padding: 7px 14px 7px 34px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sharp);
    outline: none;
    cursor: pointer;
    transition: border-color 0.15s ease;
}

.test-select-dropdown:focus {
    border-color: var(--primary);
    background-color: #ffffff;
}

.bar-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.hud-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: var(--radius-sharp);
    font-size: 0.85rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
    background-color: #ffffff;
}

.timer-pill {
    color: var(--primary);
    border-color: #bfdbfe;
    background-color: #eff6ff;
}

.timer-pill.warning {
    color: var(--danger);
    border-color: #fecaca;
    background-color: #fef2f2;
    animation: pulseTimer 1s infinite alternate;
}

@keyframes pulseTimer {
    from { opacity: 1; }
    to { opacity: 0.6; }
}

.progress-pill {
    color: var(--text-sub);
    background-color: #f8fafc;
}

                                                            
                            
                                                               
.reading-container {
    flex: 1;
    max-width: 1380px;
    width: 100%;
    margin: 0 auto;
    padding: 24px 20px 80px 20px;
}

.reading-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sharp);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
}

            
.reading-card-header {
    padding: 24px 28px;
    border-bottom: 1px solid var(--border-color);
}

.header-tags {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    flex-wrap: wrap;
}

.badge-level {
    background-color: #eff6ff;
    color: var(--primary);
    border: 1px solid #bfdbfe;
    font-size: 0.76rem;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: var(--radius-sharp);
    letter-spacing: 0.04em;
}

.badge-type {
    background-color: #f1f5f9;
    color: #475569;
    border: 1px solid #cbd5e1;
    font-size: 0.76rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: var(--radius-sharp);
}

.badge-time {
    background-color: #f8fafc;
    color: #64748b;
    border: 1px solid var(--border-color);
    font-size: 0.76rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: var(--radius-sharp);
}

.passage-title {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.02em;
    margin-bottom: 14px;
}

.instructions-banner {
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sharp);
    padding: 12px 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.instruction-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.88rem;
    color: var(--text-sub);
    line-height: 1.5;
}

.inst-pill {
    background-color: #ffffff;
    color: var(--primary);
    border: 1px solid #bfdbfe;
    font-weight: 800;
    font-size: 0.75rem;
    padding: 2px 7px;
    border-radius: var(--radius-sharp);
    flex-shrink: 0;
    margin-top: 2px;
}

                          
.mobile-segmented-bar {
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px dashed var(--border-color);
}

.segmented-tab {
    padding: 10px;
    font-size: 0.88rem;
    font-weight: 700;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sharp);
    background-color: #f1f5f9;
    color: var(--text-sub);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.15s ease;
}

.segmented-tab.active {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

                                                            
                              
                                                               
.part5-workspace {
    display: grid;
    grid-template-columns: 1.15fr 1fr;
    min-height: 600px;
}

.pane-passage {
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    background-color: #ffffff;
}

.pane-questions {
    display: flex;
    flex-direction: column;
    background-color: #fafbfd;
}

.pane-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    background-color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 60px;
    z-index: 10;
}

.pane-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.pane-hint {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.passage-body {
    padding: 24px 28px;
    font-size: 1rem;
    line-height: 1.85;
    color: #1e293b;
    overflow-y: auto;
}

.passage-body p {
    margin-bottom: 18px;
}

.passage-body p:last-child {
    margin-bottom: 0;
}

.passage-loading-state {
    padding: 60px 20px;
    text-align: center;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

                                                            
                                                  
                                                               
.questions-list-wrapper {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    overflow-y: auto;
}

.part5-card {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sharp);
    padding: 18px;
    transition: all 0.15s ease;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.part5-card:hover {
    border-color: #cbd5e1;
}

.part5-card.answered {
    border-left: 3px solid var(--primary);
}

.part5-card.correct {
    border-left: 3px solid var(--success);
    background-color: var(--success-light);
}

.part5-card.wrong {
    border-left: 3px solid var(--danger);
    background-color: var(--danger-light);
}

.card-header-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.card-num-badge {
    background-color: #f1f5f9;
    color: var(--text-main);
    font-size: 0.8rem;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: var(--radius-sharp);
    border: 1px solid #cbd5e1;
}

.part5-card.answered .card-num-badge {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.part5-card.correct .card-num-badge {
    background-color: var(--success);
    color: #ffffff;
    border-color: var(--success);
}

.part5-card.wrong .card-num-badge {
    background-color: var(--danger);
    color: #ffffff;
    border-color: var(--danger);
}

.card-rule-hint {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
}

.sentence-container {
    font-size: 0.98rem;
    font-weight: 500;
    line-height: 1.75;
    color: var(--text-main);
    margin-bottom: 14px;
}

.sentence-container strong {
    font-weight: 700;
}

               
.input-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.input-prefix-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-sub);
}

.gap-input {
    flex: 1;
    max-width: 320px;
    padding: 9px 14px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-main);
    background-color: #f8fafc;
    border: 1.5px solid #cbd5e1;
    border-radius: var(--radius-sharp);
    outline: none;
    transition: all 0.15s ease;
}

.gap-input:focus {
    background-color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.gap-input.answered {
    background-color: #ffffff;
    border-color: var(--primary);
}

.gap-input.correct {
    background-color: #ffffff;
    border-color: var(--success);
    color: var(--success);
    font-weight: 700;
}

.gap-input.wrong {
    background-color: #ffffff;
    border-color: var(--danger);
    color: var(--danger);
    font-weight: 700;
}

.gap-input:disabled {
    cursor: not-allowed;
    opacity: 0.9;
}

                                
.q-eval-box {
    margin-top: 14px;
    padding: 10px 14px;
    border-radius: var(--radius-sharp);
    font-size: 0.88rem;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.q-eval-box.correct {
    background-color: #dcfce7;
    border: 1px solid #bbf7d0;
    color: #14532d;
}

.q-eval-box.wrong {
    background-color: #fee2e2;
    border: 1px solid #fecaca;
    color: #7f1d1d;
}

.q-eval-box .explanation-text {
    font-size: 0.82rem;
    font-style: italic;
    color: #334155;
    margin-top: 4px;
    border-top: 1px dashed rgba(0, 0, 0, 0.1);
    padding-top: 6px;
}

                                                            
                        
                                                               
.reading-actions-bar {
    position: sticky;
    bottom: 0;
    background-color: #ffffff;
    border-top: 1px solid var(--border-color);
    padding: 14px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.03);
    z-index: 50;
}

.actions-status {
    font-size: 0.88rem;
    color: var(--text-sub);
}

.actions-status strong {
    color: var(--primary);
    font-weight: 800;
}

.actions-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-action {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    font-size: 0.88rem;
    font-weight: 700;
    border-radius: var(--radius-sharp);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s ease;
}

.btn-reset {
    background-color: #f1f5f9;
    color: var(--text-main);
    border-color: #cbd5e1;
}

.btn-reset:hover {
    background-color: #e2e8f0;
}

.btn-send {
    background-color: var(--primary);
    color: #ffffff;
}

.btn-send:hover {
    background-color: var(--primary-hover);
}

.btn-send:disabled {
    background-color: #94a3b8;
    cursor: not-allowed;
}

                                                            
                  
                                                               
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-backdrop.open {
    display: flex;
}

.modal-card {
    background-color: #ffffff;
    border-radius: var(--radius-sharp);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 680px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    animation: modalSlideUp 0.2s ease-out;
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-badge-tag {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--primary);
    letter-spacing: 0.05em;
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
}

.modal-close-btn {
    background: none;
    border: none;
    font-size: 1.6rem;
    color: var(--text-muted);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
}

.modal-hud-card {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 12px;
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sharp);
    padding: 16px;
    margin-bottom: 20px;
}

.hud-stat-box {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--text-main);
}

.num-highlight {
    color: var(--success);
}

.num-total {
    font-size: 1rem;
    color: var(--text-muted);
}

.num-percent {
    color: var(--primary);
}

.cefr-badge-pill {
    display: inline-block;
    background-color: var(--primary);
    color: #ffffff;
    font-size: 1.05rem;
    font-weight: 800;
    padding: 2px 14px;
    border-radius: var(--radius-sharp);
    margin-bottom: 2px;
}

.cefr-subname {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-sub);
}

.feedback-quote-box {
    background-color: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-sharp);
    padding: 14px 18px;
    margin-bottom: 20px;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

.quote-icon {
    color: var(--primary);
    font-size: 1.1rem;
    margin-top: 3px;
    flex-shrink: 0;
}

.feedback-quote-box p {
    font-size: 0.92rem;
    font-weight: 500;
    color: #1e3a8a;
    line-height: 1.5;
}

.breakdown-title {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.breakdown-card {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sharp);
    padding: 12px 16px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.breakdown-card.correct {
    border-left: 4px solid var(--success);
    background-color: #f0fdf4;
}

.breakdown-card.wrong {
    border-left: 4px solid var(--danger);
    background-color: #fef2f2;
}

.breakdown-card-idx {
    background-color: #ffffff;
    color: var(--text-main);
    border: 1px solid #cbd5e1;
    font-weight: 800;
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: var(--radius-sharp);
    flex-shrink: 0;
    margin-top: 2px;
}

.breakdown-card-info {
    flex: 1;
    font-size: 0.88rem;
    line-height: 1.45;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

.btn-modal {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    font-size: 0.88rem;
    font-weight: 700;
    border-radius: var(--radius-sharp);
    cursor: pointer;
    text-decoration: none;
    border: 1px solid transparent;
}

.btn-modal-retry {
    background-color: #f1f5f9;
    color: var(--text-main);
    border-color: #cbd5e1;
}

.btn-modal-exit {
    background-color: var(--primary);
    color: #ffffff;
}

                     
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    pointer-events: none;
}

.toast-item {
    background-color: #0f172a;
    color: #ffffff;
    padding: 10px 18px;
    border-radius: var(--radius-sharp);
    font-size: 0.88rem;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    pointer-events: auto;
    animation: toastIn 0.2s ease-out;
}

.toast-item.info {
    border-left: 4px solid var(--primary);
}

.toast-item.danger {
    border-left: 4px solid var(--danger);
}

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

                                                            
                            
                                                               
@media (max-width: 960px) {
    .part5-workspace {
        grid-template-columns: 1fr;
    }

    .mobile-segmented-bar {
        display: grid;
    }

    .part5-workspace.view-passage .pane-questions {
        display: none !important;
    }

    .part5-workspace.view-questions .pane-passage {
        display: none !important;
    }

    .pane-passage {
        border-right: none;
    }

    .reading-top-bar {
        padding: 0 12px;
    }

    .bar-center {
        max-width: 220px;
    }

    .reading-container {
        padding: 12px 10px 80px 10px;
    }

    .reading-card-header {
        padding: 18px 16px;
    }

    .passage-body {
        padding: 18px 16px;
    }

    .questions-list-wrapper {
        padding: 14px;
    }

    .gap-input {
        max-width: 100%;
    }
}