/* ==========================================================================
   7. Comprehensive Lesson Configurator & Session Runner
   ========================================================================== */

/* =======================================================================
   Comprehensive Lesson Configurator & Session Runner (Beta)
   ======================================================================= */

.lesson-view, .lesson-runner-view {
    padding: 24px 20px;
    max-width: 960px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

@media (max-width: 768px) {
    .lesson-view, .lesson-runner-view {
        padding: 12px 10px;
        padding-bottom: calc(75px + var(--sab));
    }
}

.lesson-configurator-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header Bar */
.lesson-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 18px;
}

.lesson-title-wrap h2 {
    font-size: 24px;
    font-weight: 800;
    margin: 0 0 6px 0;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    color: var(--text-main);
}

.lesson-subtitle {
    margin: 0;
    font-size: 14px;
    color: var(--text-muted);
}

.badge-beta {
    background: linear-gradient(135deg, #8b5cf6, #38bdf8);
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-ai {
    background: rgba(139, 92, 246, 0.15);
    color: #8b5cf6;
    border: 1px solid rgba(139, 92, 246, 0.35);
    font-size: 12px;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: var(--radius-sm);
}

.lesson-header-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.pulse-btn {
    box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.7);
    animation: btnPulse 2s infinite;
}

@keyframes btnPulse {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0.4); }
    70% { transform: scale(1.02); box-shadow: 0 0 0 10px rgba(56, 189, 248, 0); }
    100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(56, 189, 248, 0); }
}

@media (max-width: 768px) {
    .lesson-header-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 14px;
        padding-bottom: 14px;
    }
    .lesson-title-wrap h2 {
        font-size: 20px;
    }
    .lesson-subtitle {
        font-size: 13px;
    }
    .lesson-header-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        width: 100%;
    }
    .lesson-header-actions #lesson-start-btn {
        grid-column: span 2;
        order: -1;
        padding: 14px;
        font-size: 16px;
        font-weight: 800;
    }
}

/* Presets Chips Bar */
.lesson-presets-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
}

.presets-section-title {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-main);
}

.lesson-presets-chips-row {
    display: flex;
    gap: 10px;
    overflow-x: auto;
    padding-bottom: 6px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.lesson-presets-chips-row::-webkit-scrollbar {
    display: none;
}

.lesson-preset-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    background: var(--bg-main);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.lesson-preset-chip:hover {
    border-color: var(--primary);
    background: var(--bg-surface-hover);
}

.lesson-preset-chip.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 2px 10px rgba(56, 189, 248, 0.35);
}

.preset-del-btn {
    margin-left: 6px;
    opacity: 0.7;
    font-size: 12px;
    border-radius: 50%;
    padding: 2px 6px;
}

.preset-del-btn:hover {
    opacity: 1;
    background: rgba(0, 0, 0, 0.2);
}

.preset-description-text {
    font-size: 13px;
    margin: 8px 0 0 0;
    color: var(--text-muted);
}

/* Blocks List & Cards */
.blocks-section-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.blocks-section-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
}

.blocks-tip {
    font-size: 12.5px;
    color: var(--text-muted);
}

.lesson-steps-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.lesson-step-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px 18px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.lesson-step-card:hover {
    border-color: rgba(56, 189, 248, 0.4);
}

.lesson-step-card.step-disabled {
    opacity: 0.55;
    background: var(--bg-main);
}

.step-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.step-card-title-wrap {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1;
}

.step-num {
    width: 28px;
    height: 28px;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 800;
    flex-shrink: 0;
    color: var(--text-main);
}

.step-icon {
    font-size: 20px;
    flex-shrink: 0;
}

.step-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.step-card-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.step-card-actions .icon-btn {
    min-width: 34px;
    min-height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 13px;
}

/* Switch Toggle */
.switch-toggle {
    position: relative;
    display: inline-block;
    width: 46px;
    height: 26px;
    flex-shrink: 0;
}

.switch-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--border-color);
    transition: .2s;
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .2s;
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: var(--success);
}

input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

/* Step Card Body & Params */
.step-card-body {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border-color);
}

.step-param-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: flex-end;
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.param-group label {
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-muted);
}

.param-group.flex-2 {
    flex: 2;
    min-width: 240px;
}

.segmented-control {
    display: inline-flex;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 3px;
    gap: 3px;
}

.seg-btn {
    border: none;
    background: transparent;
    padding: 7px 14px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.seg-btn:hover {
    color: var(--text-main);
}

.seg-btn.active {
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

/* Mode Segmented Control: 2x2 grid on mobile, horizontal pill on desktop */
.mode-segmented-control {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    width: 100%;
}

.mode-segmented-control .seg-btn {
    flex: 1 1 calc(50% - 4px);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 8px;
    font-size: 13px;
    text-align: center;
}

@media (min-width: 768px) {
    .step-param-row {
        flex-direction: row;
        align-items: flex-end;
    }
    .mode-segmented-control {
        display: inline-flex;
        flex-wrap: nowrap;
        width: auto;
    }
    .mode-segmented-control .seg-btn {
        flex: initial;
        padding: 7px 14px;
    }
}

@media (max-width: 767px) {
    .step-param-row {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }
    .param-group {
        width: 100%;
    }
    .param-group.flex-2 {
        min-width: 0;
    }
    .step-select-param {
        width: 100%;
        padding: 11px 12px;
        font-size: 14px;
    }
}

.step-select-param {
    background: var(--bg-main);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 9px 12px;
    font-size: 13.5px;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: var(--transition);
}

.step-select-param:focus {
    border-color: var(--primary);
}

.ai-debrief-info-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(139, 92, 246, 0.08);
    border: 1px dashed rgba(139, 92, 246, 0.35);
    padding: 14px 16px;
    border-radius: var(--radius-md);
    font-size: 13.5px;
    color: var(--text-main);
    line-height: 1.5;
}

.ai-box-icon {
    font-size: 24px;
    flex-shrink: 0;
}

/* Bottom Floating CTA */
.lesson-bottom-cta {
    padding: 10px 0;
}

@media (max-width: 768px) {
    .lesson-bottom-cta {
        position: sticky;
        bottom: calc(12px + var(--sab));
        z-index: 40;
        padding: 8px 0;
        margin-top: 16px;
    }
    .lesson-bottom-cta .btn {
        box-shadow: 0 4px 20px rgba(56, 189, 248, 0.4);
    }
}

.btn-xl {
    padding: 15px 24px;
    font-size: 17px;
    font-weight: 800;
    border-radius: var(--radius-lg);
}

/* =======================================================================
   Lesson Session Runner Stage
   ======================================================================= */

.lesson-runner-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border-color);
    flex-wrap: wrap;
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--bg-main);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.runner-nav-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.runner-timer-wrap {
    font-family: var(--font-mono, monospace);
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
    background: var(--bg-card);
    padding: 5px 12px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    white-space: nowrap;
}

.runner-breadcrumbs-row {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    max-width: 540px;
    padding: 4px 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.runner-breadcrumbs-row::-webkit-scrollbar {
    display: none;
}

.runner-crumb {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    white-space: nowrap;
    transition: var(--transition);
}

.crumb-num {
    font-size: 11px;
    font-weight: 800;
}

.runner-crumb.step-done {
    background: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.4);
    color: var(--success);
}

.runner-crumb.step-active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.45);
}

.crumb-separator {
    color: var(--text-dim);
    font-size: 11px;
}

@media (max-width: 768px) {
    .lesson-runner-header {
        padding: 10px 8px;
        display: grid;
        grid-template-columns: auto 1fr auto;
        gap: 8px;
        align-items: center;
    }
    .runner-nav-left {
        gap: 6px;
    }
    .runner-nav-left .btn {
        padding: 6px 10px;
        font-size: 12px;
    }
    .runner-timer-wrap {
        font-size: 13px;
        padding: 4px 8px;
    }
    .runner-breadcrumbs-row {
        max-width: none;
        flex-wrap: nowrap;
        gap: 4px;
        justify-content: center;
    }
    .runner-crumb {
        padding: 4px 8px;
        font-size: 11px;
    }
    /* On mobile, collapse inactive crumbs to save horizontal space */
    .runner-crumb:not(.step-active) .crumb-label {
        display: none;
    }
    .crumb-separator {
        font-size: 9px;
    }
    .runner-nav-right .btn {
        padding: 6px 8px;
        font-size: 12px;
        white-space: nowrap;
    }
}

.lesson-runner-progress-track {
    width: 100%;
    height: 4px;
    background: var(--bg-surface-hover);
    overflow: hidden;
    margin-bottom: 24px;
}

.lesson-runner-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #38bdf8, #8b5cf6);
    transition: width 0.3s ease;
}

/* Stage Card Box */
.step-card-box {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    max-width: 760px;
    margin: 0 auto;
}

@media (max-width: 640px) {
    .step-card-box {
        padding: 18px 14px;
        border-radius: var(--radius-md);
    }
}

.step-mini-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    gap: 10px;
    flex-wrap: wrap;
}

.step-tags-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.step-term-display {
    text-align: center;
    padding: 16px 0;
}

.display-term {
    font-size: 36px;
    font-weight: 800;
    margin: 0 0 6px 0;
    color: var(--text-main);
    letter-spacing: -0.5px;
}

.display-phonetic {
    font-size: 18px;
    color: var(--text-muted);
}

.step-context-box {
    background: var(--bg-main);
    border-left: 3px solid var(--primary);
    padding: 12px 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-top: 14px;
    font-size: 15px;
    line-height: 1.5;
}

/* -----------------------------------------------------------------------
   Vocabulary Step: Modes
   ----------------------------------------------------------------------- */

/* Mode 1: Quiz (4 Options) */
.lesson-quiz-card {
    max-width: 680px;
    margin: 0 auto;
}

.lesson-quiz-options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    width: 100%;
}

@media (min-width: 640px) {
    .lesson-quiz-options-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
}

.lesson-quiz-opt-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    min-height: 56px;
    background: var(--bg-main);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    transition: all 0.15s ease;
    text-align: left;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.lesson-quiz-opt-btn:hover:not(:disabled) {
    border-color: var(--primary);
    background: var(--bg-surface-hover);
    transform: translateY(-1px);
}

.lesson-quiz-opt-btn:active:not(:disabled) {
    transform: scale(0.98);
}

.quiz-opt-num {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    flex-shrink: 0;
}

.quiz-opt-text {
    flex: 1;
    line-height: 1.35;
    word-break: break-word;
}

.lesson-quiz-opt-btn.opt-correct {
    background: rgba(16, 185, 129, 0.18) !important;
    border-color: var(--success) !important;
    color: var(--success) !important;
}

.lesson-quiz-opt-btn.opt-correct .quiz-opt-num {
    background: var(--success);
    color: #fff;
    border-color: var(--success);
}

.lesson-quiz-opt-btn.opt-wrong {
    background: rgba(239, 68, 68, 0.18) !important;
    border-color: var(--danger) !important;
    color: var(--danger) !important;
}

.lesson-quiz-opt-btn.opt-wrong .quiz-opt-num {
    background: var(--danger);
    color: #fff;
    border-color: var(--danger);
}

/* Mode 2: Flashcards */
.translation-reveal-banner {
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.3);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    text-align: center;
    color: var(--text-main);
}

.tr-text {
    font-size: 22px;
    display: block;
    margin-top: 4px;
}

.tr-definition {
    font-size: 14px;
}

.rating-buttons-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

@media (max-width: 640px) {
    .rating-buttons-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
}

.srs-btn-rating {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 6px;
    gap: 4px;
    min-height: 52px;
    border-radius: var(--radius-md);
}

.rating-key {
    font-size: 11px;
    opacity: 0.7;
}

.rating-label {
    font-size: 13px;
    font-weight: 700;
}

/* Mode 3: Typing & Mode 4: Dictation */
.typing-input-wrap {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

@media (min-width: 640px) {
    .typing-input-wrap {
        flex-direction: row;
    }
    .typing-input-wrap .typing-main-input {
        flex: 1;
    }
}

.typing-main-input {
    font-size: 16px !important; /* Prevents auto-zoom on mobile safari/chrome */
    padding: 12px 16px;
    border-radius: var(--radius-md);
}

.dictation-hero-play {
    padding: 10px 0;
}

.dictation-play-btn {
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 700;
    border-radius: var(--radius-full);
}

.dictation-hint {
    font-size: 14px;
}

/* Shared Trainer Feedback Box */
.trainer-feedback-box {
    padding: 14px 18px;
    border-radius: var(--radius-md);
    font-size: 14.5px;
    line-height: 1.5;
    animation: fadeIn 0.2s ease-out;
}

.trainer-feedback-box.feedback-correct {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.35);
    color: var(--text-main);
}

.trainer-feedback-box.feedback-wrong {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.35);
    color: var(--text-main);
}

/* -----------------------------------------------------------------------
   Grammar Questions & Theory Stage
   ----------------------------------------------------------------------- */

.grammar-question-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px 18px;
}

.grammar-sentence-prompt {
    font-size: 20px;
    font-weight: 600;
    line-height: 1.5;
    margin: 0 0 10px 0;
    color: var(--text-main);
}

.clue-tag {
    font-size: 13px;
    color: var(--text-muted);
}

.grammar-options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

@media (max-width: 640px) {
    .grammar-options-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
}

.grammar-opt-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    min-height: 54px;
    background: var(--bg-main);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
    transition: all 0.15s ease;
    text-align: left;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.grammar-opt-btn:hover:not(:disabled) {
    border-color: var(--primary);
    background: var(--bg-surface-hover);
}

.grammar-opt-btn.opt-correct {
    background: rgba(16, 185, 129, 0.18) !important;
    border-color: var(--success) !important;
    color: var(--success) !important;
}

.grammar-opt-btn.opt-wrong {
    background: rgba(239, 68, 68, 0.18) !important;
    border-color: var(--danger) !important;
    color: var(--danger) !important;
}

.opt-key {
    width: 26px;
    height: 26px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.feedback-banner {
    padding: 16px 18px;
    border-radius: var(--radius-md);
}

.feedback-banner.fb-success {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.35);
}

.feedback-banner.fb-danger {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.35);
}

.fb-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
}

.fb-text {
    font-size: 14px;
    line-height: 1.45;
}

/* Murphy Golden Formula & Contrasts */
.golden-formula-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(168, 85, 247, 0.08));
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-md);
    padding: 16px;
}

.formula-label {
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary);
    margin-bottom: 8px;
}

.formula-code {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-family: var(--font-mono, monospace);
    font-size: 14px;
    font-weight: 700;
    color: var(--text-main);
    overflow-x: auto;
    white-space: pre-wrap;
    margin: 0;
}

.contrast-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.contrast-row {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

@media (min-width: 640px) {
    .contrast-row {
        flex-direction: row;
        gap: 16px;
    }
}

.contrast-col {
    flex: 1;
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
}

.contrast-col.a {
    border-left: 3px solid #38bdf8;
}

.contrast-col.b {
    border-left: 3px solid #10b981;
}

.contrast-col .col-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 6px;
}

.contrast-col .col-example {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 4px;
}

.contrast-col .col-trans {
    font-size: 13px;
    color: var(--text-muted);
}

.contrast-diff {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 13px;
    color: var(--text-main);
}

.journaling-box {
    background: rgba(56, 189, 248, 0.06);
    border: 1px dashed rgba(56, 189, 248, 0.3);
    border-radius: var(--radius-md);
    padding: 14px 18px;
}

.hw-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
}

/* -----------------------------------------------------------------------
   Listening Stage
   ----------------------------------------------------------------------- */

.audio-player-card {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    text-align: center;
}

.audio-controls-row {
    display: flex;
    justify-content: center;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.answer-input-group {
    display: flex;
    gap: 10px;
}

@media (max-width: 640px) {
    .answer-input-group {
        flex-direction: column;
    }
}

.transcript-box {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font-size: 13.5px;
}

/* -----------------------------------------------------------------------
   Reading Stage
   ----------------------------------------------------------------------- */

.article-paragraph-card {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 18px;
    margin-bottom: 14px;
}

.article-para-en {
    font-size: 17px;
    line-height: 1.75;
    margin: 0 0 10px 0;
}

.clickable-reader-word {
    cursor: pointer;
    border-radius: 3px;
    padding: 1px 3px;
    transition: background 0.15s;
}

.clickable-reader-word:hover {
    background: rgba(56, 189, 248, 0.25);
    color: var(--primary);
}

.article-para-ru {
    font-size: 14px;
    color: var(--text-muted);
    border-top: 1px dashed var(--border-color);
    padding-top: 8px;
    margin: 8px 0 0 0;
}

.vocab-highlights-bar {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 16px;
}

.highlights-title {
    font-size: 13px;
    font-weight: 700;
    margin-bottom: 8px;
    display: block;
}

.highlights-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.vh-chip {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 5px 12px;
    border-radius: var(--radius-full);
    font-size: 12.5px;
}

/* Word Popup in Lesson: Floating on laptop, Bottom sheet on mobile */
.lesson-popup {
    position: fixed;
    z-index: 1000;
    width: 270px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
    animation: fadeIn 0.15s ease-out;
}

@media (max-width: 640px) {
    .lesson-popup {
        left: 14px !important;
        right: 14px !important;
        bottom: calc(20px + var(--sab)) !important;
        top: auto !important;
        width: auto !important;
        border-radius: var(--radius-lg);
        box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    }
}

.popup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
    margin-bottom: 6px;
}

.popup-close-btn {
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 16px;
}

.popup-trans {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-main);
}

/* -----------------------------------------------------------------------
   AI Debrief Stage
   ----------------------------------------------------------------------- */

.lesson-debrief-card {
    max-width: 800px;
}

.debrief-banner-header {
    display: flex;
    align-items: center;
    gap: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    flex-wrap: wrap;
}

.grade-badge-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 90px;
    height: 90px;
    background: var(--bg-main);
    border: 3px solid var(--primary);
    border-radius: 50%;
    flex-shrink: 0;
}

.grade-badge {
    font-size: 34px;
    font-weight: 900;
    line-height: 1;
    color: var(--primary);
}

.score-pct {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-muted);
}

.debrief-titles {
    flex: 1;
    min-width: 220px;
}

.debrief-headline {
    font-size: 22px;
    font-weight: 800;
    margin: 0 0 8px 0;
    color: var(--text-main);
}

.blocks-scores-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
}

.block-score-item {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
}

.bs-header {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-main);
}

.bs-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-card);
    border-radius: 3px;
    overflow: hidden;
}

.bs-bar-fill {
    height: 100%;
    background: var(--success);
}

.debrief-list, .tomorrow-focus-list {
    margin: 8px 0 0 0;
    padding-left: 20px;
    font-size: 14.5px;
    line-height: 1.6;
}

.tomorrow-focus-list {
    list-style: none;
    padding-left: 0;
}

.tomorrow-focus-list li {
    padding: 8px 12px;
    background: var(--bg-main);
    border-left: 3px solid var(--primary);
    margin-bottom: 6px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 14px;
}

.error-cards-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.error-analysis-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: rgba(234, 179, 8, 0.1);
    border: 1px solid rgba(234, 179, 8, 0.3);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    font-size: 14px;
    line-height: 1.45;
}

.celebrate-badge {
    font-size: 48px;
    margin-bottom: 12px;
}

.step-completed-box h3 {
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text-main);
}

.score-highlight {
    font-size: 16px;
    color: var(--text-muted);
}

/* History Modal items */
.lesson-history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 65vh;
    overflow-y: auto;
}

.lesson-history-item {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 16px;
}

.lh-header {
    display: flex;
    justify-content: space-between;
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
}

.lh-date {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: normal;
}

.lh-stats {
    display: flex;
    gap: 12px;
    align-items: center;
    font-size: 13px;
    margin-bottom: 6px;
}

.lh-headline {
    font-size: 13px;
    font-style: italic;
    color: var(--text-dim);
}

@media (max-width: 640px) {
    .display-term {
        font-size: 26px;
    }
}