* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
}

:root {
    --primary-blue: #4A90E2;
    --primary-blue-dark: #357ABD;
    --success: #2ECC71;
    --error: #E74C3C;
    --warning: #F39C12;
    --bg-primary: #FAFAFA;
    --bg-card: #FFFFFF;
    --text-primary: #2C3E50;
    --text-secondary: #7F8C8D;
    --border: #ECF0F1;
    --romanization: #9B59B6;
    --hint-gem: #F1C40F;
    --blank-bg: #E8F4FD;
    --blank-border: #4A90E2;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: stretch;
    padding: 20px;
    overflow: hidden;
}

.phone-frame {
    width: 100vw;
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.phone-notch {
    display: none;
}

@media (min-width: 480px) {
    .phone-frame {
        width: 375px;
        height: 812px;
        border-radius: 40px;
        box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
        border: 12px solid #1a1a2e;
    }

    .phone-notch {
        display: block;
        position: absolute;
        top: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 150px;
        height: 30px;
        background: #1a1a2e;
        border-radius: 0 0 20px 20px;
        z-index: 100;
    }

    body {
        padding: 20px;
    }
}

@media (max-width: 479px) {
    body {
        padding: 0;
    }

    .phone-frame {
        width: 100%;
        height: 100%;
        min-height: 100vh;
        min-height: 100svh;
        min-height: 100dvh;
        border-radius: 0;
        border: none;
    }
}

.screen {
    width: 100%;
    height: 100%;
    min-height: 0;
    display: none;
    flex-direction: column;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: flex;
}

#quizScreen,
#resultsScreen,
#endScreen {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header */
.header {
    padding: 50px 16px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.header-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.lang-switch {
    background: var(--border);
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.lang-switch:hover {
    background: var(--primary-blue);
    color: white;
}

.back-btn {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-primary);
    padding: 4px;
}

/* Progress Bar */
.progress-header {
    padding: 8px 16px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.progress-bar-container {
    display: flex;
    align-items: center;
    gap: 8px;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), #6dd5fa);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    min-width: 50px;
}

/* Content */
.content {
    flex: 1;
    min-height: 0;
    padding: 12px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

/* Quiz Header */
.quiz-header {
    padding: 50px 16px 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.quiz-progress {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--warning);
}

/* Question */
.question-text {
    text-align: center;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    padding: 12px 8px 8px;
    flex-shrink: 0;
}

.question-image-container {
    padding: 0 12px 8px;
    flex-shrink: 0;
}

.question-image {
    width: 100%;
    height: auto;
    max-height: 42vh;
    max-height: 42svh;
    max-height: 42dvh;
    object-fit: contain;
    border-radius: 12px;
    display: block;
    background: #eef2f7;
}

/* Fill-in-the-blank Sentence */
.sentence-container {
    padding: 10px 12px 8px;
    flex-shrink: 0;
}

.sentence-card {
    background: linear-gradient(135deg, #E8F4FD 0%, #D4E6F1 100%);
    border: 2px solid var(--primary-blue);
    border-radius: 12px;
    padding: 14px;
}

.sentence-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.sentence-text {
    font-size: 13px;
    line-height: 1.8;
    color: var(--text-primary);
}

.blank-space {
    display: inline-block;
    min-width: 80px;
    padding: 2px 8px;
    background: var(--bg-card);
    border: 2px dashed var(--blank-border);
    border-radius: 6px;
    text-align: center;
    font-weight: 700;
    color: var(--primary-blue);
    cursor: pointer;
    transition: all 0.2s;
    margin: 0 4px;
}

.blank-space:hover {
    background: var(--blank-border);
    color: white;
}

.blank-space.revealed {
    background: var(--success);
    border-color: var(--success);
    color: white;
    border-style: solid;
}

.blank-hint {
    font-size: 9px;
    color: var(--text-secondary);
    margin-top: 6px;
    text-align: center;
}

.reveal-btn {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 10px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 8px;
    width: 100%;
    transition: all 0.2s;
}

.reveal-btn:hover {
    background: var(--primary-blue-dark);
}

.reveal-btn:disabled {
    background: var(--border);
    cursor: not-allowed;
}

/* Options - Compact */
.options-container {
    padding: 0 12px 8px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    flex-shrink: 0;
}

.option-btn {
    background: var(--bg-card);
    border: 2px solid var(--border);
    padding: 12px 10px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-align: center;
}

.option-btn:hover {
    border-color: var(--primary-blue);
    background: #E8F4FD;
}

.option-btn.selected {
    border-color: var(--primary-blue);
    background: #E8F4FD;
}

.option-btn.correct {
    border-color: var(--success);
    background: #E8F8EF;
    color: #27AE60;
}

.option-btn.incorrect {
    border-color: var(--error);
    background: #FDEDEC;
    color: #C0392B;
}

.option-letter {
    font-size: 10px;
    color: var(--text-secondary);
    font-weight: 500;
}

.option-word {
    font-size: 15px;
    font-weight: 700;
}

.hint-btn {
    background: none;
    border: none;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 4px;
    cursor: pointer;
    color: var(--warning);
    font-size: 12px;
    font-weight: 500;
    flex-shrink: 0;
}

/* Feedback Screen */
.feedback-content {
    padding: 12px;
    min-height: 0;
    overflow-y: auto;
    flex: 1;
    -webkit-overflow-scrolling: touch;
}

.feedback-header {
    text-align: center;
    margin-bottom: 12px;
    flex-shrink: 0;
}

.feedback-emoji {
    font-size: 48px;
    margin-bottom: 8px;
    animation: bounce 0.5s ease;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-15px);
    }
}

.feedback-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 4px;
}

.feedback-title.correct {
    color: var(--success);
}

.feedback-title.incorrect {
    color: var(--error);
}

.feedback-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Compact Cards */
.feedback-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.feedback-word {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    text-align: center;
}

.feedback-roman {
    color: var(--romanization);
    font-size: 13px;
    font-weight: 500;
    text-align: center;
    margin-bottom: 10px;
}

/* Complete Sentence Display */
.complete-sentence {
    background: linear-gradient(135deg, #E8F8EF 0%, #D5F5E3 100%);
    border: 2px solid var(--success);
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 10px;
}

.complete-sentence-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 6px;
}

.complete-sentence-text {
    font-size: 13px;
    line-height: 1.8;
    color: var(--text-primary);
}

.filled-word {
    display: inline-block;
    padding: 2px 8px;
    background: var(--success);
    color: white;
    border-radius: 6px;
    font-weight: 700;
    margin: 0 4px;
}

/* Tabs for Content */
.tabs-container {
    display: flex;
    gap: 6px;
    margin-bottom: 10px;
    flex-shrink: 0;
}

.tab-btn {
    flex: 1;
    background: var(--bg-card);
    border: 2px solid var(--border);
    padding: 8px 6px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Why Correct - Compact */
.why-correct-section {
    background: linear-gradient(135deg, #E8F8EF 0%, #D5F5E3 100%);
    border: 2px solid var(--success);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 10px;
}

.section-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--success);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.explanation-text {
    font-size: 12px;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 8px;
}

.key-points {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.key-point {
    background: white;
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 11px;
}

.key-point-label {
    font-size: 9px;
    color: var(--text-secondary);
    margin-bottom: 2px;
}

.key-point-value {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
}

/* Other Options - Compact */
.option-detail-card {
    background: var(--bg-primary);
    border-radius: 10px;
    padding: 10px;
    margin-bottom: 8px;
    border-left: 3px solid var(--error);
}

.option-detail-card:last-child {
    margin-bottom: 0;
}

.option-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.option-detail-word {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
}

.option-detail-roman {
    color: var(--romanization);
    font-size: 10px;
}

.option-detail-usage {
    font-size: 11px;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 4px;
}

.option-detail-example {
    background: white;
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 10px;
    color: var(--text-secondary);
    border-left: 2px solid var(--border);
}

/* Intensity Scale - Compact */
.intensity-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 10px;
}

.intensity-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    text-align: center;
}

.intensity-scale {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 8px 0;
}

.intensity-bar {
    flex: 1;
    height: 8px;
    background: linear-gradient(90deg, #AED6F1, #5DADE2, #2E86C1, #1B4F72);
    border-radius: 4px;
    position: relative;
}

.intensity-words {
    display: flex;
    justify-content: space-between;
    margin-top: 6px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
}

.intensity-word {
    text-align: center;
    flex: 1;
}

.intensity-word-text {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.intensity-word-desc {
    font-size: 8px;
    color: var(--text-secondary);
}

/* Comparison Table - Compact */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 10px;
}

.comparison-table th,
.comparison-table td {
    padding: 6px 4px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.comparison-table th {
    background: var(--bg-primary);
    font-weight: 700;
    color: var(--text-secondary);
    font-size: 9px;
}

.comparison-table tr:last-child td {
    border-bottom: none;
}

/* Tip Box - Compact */
.tip-box {
    background: linear-gradient(135deg, #FEF9E7 0%, #FDEBD0 100%);
    border: 2px solid var(--warning);
    border-radius: 10px;
    padding: 10px;
    margin-top: 10px;
}

.tip-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--warning);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.tip-text {
    font-size: 10px;
    color: var(--text-primary);
    line-height: 1.5;
}

/* Expand Button */
.expand-btn {
    background: none;
    border: none;
    color: var(--primary-blue);
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 6px;
    width: 100%;
    margin-top: 6px;
}

.expand-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.expand-content.expanded {
    max-height: 300px;
}

.expand-icon {
    transition: transform 0.3s ease;
}

.expand-btn.expanded .expand-icon {
    transform: rotate(180deg);
}

/* Next Button Container */
.next-btn-container {
    padding: 10px 12px;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

.primary-btn {
    background: var(--primary-blue);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 24px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.primary-btn:hover {
    background: var(--primary-blue-dark);
    transform: scale(1.02);
}

.primary-btn:active {
    transform: scale(0.98);
}

/* Tab Bar */
.tab-bar {
    display: flex;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    padding: 8px 0;
    padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
    flex-shrink: 0;
}

.tab-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 6px;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.tab-item.active {
    color: var(--primary-blue);
}

.tab-icon {
    font-size: 20px;
}

.tab-label {
    font-size: 10px;
    font-weight: 500;
}

/* Confetti */
.confetti {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--success);
    animation: confetti-fall 1.5s ease-out forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(-100px) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(800px) rotate(720deg);
        opacity: 0;
    }
}

/* Screen Indicator */
.screen-indicator {
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 10px;
    font-weight: 500;
    z-index: 50;
}

/* Results Screen */
.results-content {
    flex: 1;
    min-height: 0;
    padding: 20px 16px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    text-align: center;
}

.results-emoji {
    font-size: 64px;
    margin-bottom: 16px;
}

.results-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.results-score {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.results-subtitle {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.results-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 11px;
    color: var(--text-secondary);
}

.review-list {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 14px;
    margin-bottom: 20px;
    text-align: left;
}

.review-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.review-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    margin-bottom: 8px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: #fff;
    transition: all 0.2s ease;
}

.review-item.clickable {
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.review-item.clickable:hover {
    background: #f8fafc;
    border-color: var(--primary-blue);
    transform: translateY(-1px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
}

.review-item.clickable:active {
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.review-word {
    font-weight: 700;
    color: var(--text-primary);
}

.review-status {
    color: var(--primary-blue);
    font-size: 12px;
    font-weight: 600;
    background: #e0f2fe;
    padding: 4px 8px;
    border-radius: 12px;
}

.results-action-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.results-action-btn {
    width: 100%;
    height: 44px;
    border-radius: 12px;
    border: 1px solid transparent;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.2;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0 8px;
    white-space: nowrap;
}

.results-action-btn:active {
    transform: scale(0.98);
}

.results-action-primary {
    background: var(--primary-blue);
    color: #fff;
}

.results-action-primary:hover {
    background: var(--primary-blue-dark);
}

.results-action-secondary {
    background: #fff;
    color: var(--text-primary);
    border-color: var(--border);
}

.results-action-secondary:hover {
    border-color: #9ca3af;
}

.results-action-danger {
    background: #fff;
    color: #b91c1c;
    border-color: #fecaca;
}

.results-action-danger:hover {
    background: #fff5f5;
    border-color: #fca5a5;
}

.end-session-content {
    display: grid;
    gap: 14px;
    place-items: center;
    text-align: center;
}

/* Home Screen */
.mission-card {
    background: var(--bg-card);
    border-radius: 14px;
    padding: 14px;
    margin-bottom: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.mission-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.mission-text {
    font-size: 20px;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 12px;
    line-height: 1.4;
    text-align: center;
}

.progress-bar-sm {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill-sm {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-blue), #6dd5fa);
    border-radius: 3px;
}

.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    padding: 20px 16px;
    text-align: center;
    margin-bottom: 12px;
    color: white;
}

.hero-emoji {
    font-size: 36px;
    margin-bottom: 10px;
}

.hero-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 4px;
}

.hero-subtitle {
    font-size: 12px;
    opacity: 0.9;
    margin-bottom: 20px;
}

.name-input-group {
    background: rgba(255, 255, 255, 0.15);
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 16px;
    text-align: left;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.name-input-group label {
    display: block;
    color: white;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 8px;
}

#learnerName {
    width: 100%;
    padding: 12px 14px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    background: white;
    color: var(--text-primary);
    box-sizing: border-box;
    font-family: inherit;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

#learnerName::placeholder {
    color: #cbd5e1;
}

.error-msg {
    color: #ffd6d6;
    font-size: 11px;
    margin-top: 6px;
    margin-bottom: 0;
    font-weight: 500;
}

.footer-stats {
    padding: 10px 12px;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
}

.stat-value {
    color: var(--text-primary);
    font-weight: 700;
}

/* Navigation Dots */
.nav-dots {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
    z-index: 50;
}

.nav-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.2s;
}

.nav-dot.active {
    background: white;
    width: 18px;
    border-radius: 3px;
}

/* Scrollbar */
.content::-webkit-scrollbar,
.feedback-content::-webkit-scrollbar {
    width: 4px;
}

.content::-webkit-scrollbar-thumb,
.feedback-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

/* Additional Example Sentences */
.example-sentences {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 12px;
    margin-top: 10px;
}

.example-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.example-item {
    font-size: 11px;
    color: var(--text-primary);
    line-height: 1.6;
    padding: 6px 0;
    border-bottom: 1px dashed var(--border);
}

.example-item:last-child {
    border-bottom: none;
}

.example-highlight {
    color: var(--primary-blue);
    font-weight: 700;
}

/* Learner Landing */
.sample-lp-page {
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
    margin: 0;
    font-family: 'Noto Sans JP', sans-serif;
    background:
        radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.26), transparent 42%),
        radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.18), transparent 45%),
        linear-gradient(140deg, #2f4ec9 0%, #6a43b9 100%);
}

.lpv2-shell {
    width: min(760px, 92vw);
    margin: 0 auto;
    padding: 28px 0;
    padding-bottom: calc(28px + env(safe-area-inset-bottom, 0px));
}

.lpv2-card {
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 20px 60px rgba(20, 26, 58, 0.28);
}

.lpv2-title {
    margin: 0 0 8px;
    font-size: clamp(30px, 5.4vw, 46px);
    line-height: 1.1;
    color: #111827;
}

.lpv2-subtitle {
    margin: 0 0 20px;
    font-size: clamp(16px, 2.4vw, 20px);
    color: #374151;
}

.lpv2-guide {
    background: #f8fafc;
    border: 1px solid #dbe4ff;
    border-radius: 14px;
    padding: 18px;
}

.lpv2-owner {
    margin-top: 14px;
}

.lpv2-owner-split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 14px;
    align-items: start;
}

.lpv2-owner-pane {
    display: grid;
    gap: 10px;
    min-width: 0;
}

.lpv2-owner-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
    margin-top: 14px;
    align-items: center;
    flex-wrap: wrap;
}

.google-login-mount {
    min-width: 220px;
    min-height: 40px;
}

.lpv2-owner-form {
    display: grid;
    gap: 8px;
}

.lpv2-owner-list-wrap {
    margin-top: 12px;
}

.lpv2-admin-users {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 8px;
}

.lpv2-admin-user-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    background: #fff;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 10px 12px;
}

.lpv2-admin-user-meta {
    display: grid;
    gap: 2px;
}

.lpv2-admin-user-meta span {
    font-size: 12px;
    color: #64748b;
}

.lpv2-remove-btn {
    border: 1px solid #ef4444;
    color: #b91c1c;
    background: #fff;
    border-radius: 8px;
    padding: 6px 10px;
    font-weight: 700;
    cursor: pointer;
}

.lpv2-feedback-list {
    display: grid;
    gap: 10px;
    max-height: 620px;
    overflow-y: auto;
}

.lpv2-feedback-item {
    background: #fff;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 12px;
    display: grid;
    gap: 10px;
}

.lpv2-feedback-meta {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    align-items: baseline;
}

.lpv2-feedback-meta span {
    font-size: 12px;
    color: #64748b;
}

.lpv2-feedback-section {
    display: grid;
    gap: 4px;
}

.lpv2-feedback-label {
    font-size: 13px;
    font-weight: 700;
    color: #334155;
}

.lpv2-feedback-body {
    white-space: pre-wrap;
    word-break: break-word;
    font-size: 14px;
    color: #1f2937;
}

@media (max-width: 960px) {
    .lpv2-owner-split {
        grid-template-columns: 1fr;
    }
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.72);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.prompt-modal-content {
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.prompt-modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.lpv2-guide-title {
    margin: 0 0 10px;
    font-weight: 700;
    color: #1f2937;
}

.lpv2-steps {
    margin: 0 0 10px 20px;
    color: #374151;
    line-height: 1.7;
}

.lpv2-label {
    display: block;
    margin-bottom: 6px;
    color: #111827;
    font-weight: 600;
}

.lpv2-input {
    width: 100%;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 10px 12px;
    font-size: 16px;
    margin-bottom: 10px;
}

.lpv2-help {
    margin: 0 0 12px;
    color: #475569;
}

.lpv2-help.error {
    color: #b91c1c;
}

.lpv2-start-btn,
.lpv2-admin-link {
    display: inline-block;
    border-radius: 10px;
    padding: 10px 16px;
    font-weight: 700;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 15px;
}

.under-construction-toast {
    position: fixed;
    left: 50%;
    bottom: 88px;
    transform: translateX(-50%) translateY(10px);
    background: rgba(15, 23, 42, 0.92);
    color: #fff;
    border-radius: 999px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.02em;
    opacity: 0;
    pointer-events: none;
    z-index: 1600;
    transition: opacity 160ms ease, transform 160ms ease;
}

.under-construction-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.lpv2-start-btn {
    background: #1d4ed8;
    color: #fff;
}

.lpv2-admin-link {
    background: #fff;
    color: #1f2937;
    border: 1px solid #cbd5e1;
}

.hidden {
    display: none !important;
}