/* ========================================
   カラーパレット & デザイントークン
======================================== */
:root {
    --eval-s: #3498db;
    --eval-a: #27ae60;
    --eval-b: #f39c12;
    --eval-c: #e74c3c;
    --eval-d: #e67e22;
    --eval-e: #c0392b;
    --primary: #1e3a5f;
    --primary-light: #2c5282;
    --secondary: #4a5568;
    --accent: #4299e1;
    --card-bg: #ffffff;
    --question-bg: #f7fafc;
    --answer-bg: #ebf4ff;
    --border-color: #e2e8f0;
    --text-dark: #1a202c;
    --text-light: #718096;
    --bg-surface: #edf2f7;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 25px rgba(0,0,0,0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --body-bg: linear-gradient(160deg, #dce8f5 0%, #c4d8ed 100%);
    --modal-overlay: rgba(0, 0, 0, 0.5);
    --input-bg: #ffffff;
    --input-border: #d1d5db;
}

/* ========================================
   ダークモード
======================================== */
[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-light: #93c5fd;
    --secondary: #9ca3af;
    --accent: #60a5fa;
    --card-bg: #1e293b;
    --question-bg: #1a2332;
    --answer-bg: #172033;
    --border-color: #334155;
    --text-dark: #e2e8f0;
    --text-light: #94a3b8;
    --bg-surface: #0f172a;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 25px rgba(0,0,0,0.5);
    --body-bg: linear-gradient(160deg, #0f172a 0%, #1e293b 100%);
    --modal-overlay: rgba(0, 0, 0, 0.7);
    --input-bg: #1e293b;
    --input-border: #475569;
    --eval-s: #60a5fa;
    --eval-a: #34d399;
    --eval-b: #fbbf24;
    --eval-c: #f87171;
    --eval-d: #fb923c;
    --eval-e: #ef4444;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary: #60a5fa;
        --primary-light: #93c5fd;
        --secondary: #9ca3af;
        --accent: #60a5fa;
        --card-bg: #1e293b;
        --question-bg: #1a2332;
        --answer-bg: #172033;
        --border-color: #334155;
        --text-dark: #e2e8f0;
        --text-light: #94a3b8;
        --bg-surface: #0f172a;
        --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
        --shadow-lg: 0 8px 25px rgba(0,0,0,0.5);
        --body-bg: linear-gradient(160deg, #0f172a 0%, #1e293b 100%);
        --modal-overlay: rgba(0, 0, 0, 0.7);
        --input-bg: #1e293b;
        --input-border: #475569;
        --eval-s: #60a5fa;
        --eval-a: #34d399;
        --eval-b: #fbbf24;
        --eval-c: #f87171;
        --eval-d: #fb923c;
        --eval-e: #ef4444;
    }
}

/* ========================================
   基本設定
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Yu Gothic', 'Meiryo', sans-serif;
    background: var(--body-bg);
    min-height: 100vh;
    min-height: 100dvh;
    padding: 20px;
    padding-top: calc(20px + env(safe-area-inset-top, 0px));
    padding-left: calc(20px + env(safe-area-inset-left, 0px));
    padding-right: calc(20px + env(safe-area-inset-right, 0px));
    color: var(--text-dark);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s ease, color 0.3s ease;
}

input, select, textarea {
    background: var(--input-bg);
    color: var(--text-dark);
    border-color: var(--input-border);
    font-size: 16px; /* Prevent iOS auto-zoom */
    -webkit-font-smoothing: antialiased;
}

button {
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    touch-action: manipulation;
}

.modal {
    background: var(--modal-overlay);
}

.modal-content {
    background: var(--card-bg);
    color: var(--text-dark);
}

.app-container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    position: relative;
}

/* ========================================
   ヘッダー
======================================== */
.app-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: 12px 20px;
    text-align: center;
    position: relative;
}

.theme-toggle-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(255,255,255,0.15);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle-btn:hover {
    background: rgba(255,255,255,0.3);
}

.app-header h1 {
    font-size: 1.3rem;
    margin-bottom: 0;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 0.75rem;
    opacity: 0.8;
    font-weight: 400;
    margin: 0;
}

/* ========================================
   タブナビゲーション
======================================== */
.tab-nav {
    display: flex;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tab-button {
    flex: 1;
    min-width: 0;
    padding: 14px 8px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-light);
    transition: all var(--transition-normal);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    white-space: nowrap;
}

.tab-icon {
    font-size: 1.1rem;
    display: none;
}

.tab-button:hover {
    background: #e8e9ef;
    color: var(--primary);
}

.tab-button.active {
    color: var(--primary);
    background: white;
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent);
    border-radius: 3px 3px 0 0;
}

/* ========================================
   タブコンテンツ
======================================== */
.tab-content {
    display: none;
    padding: 24px;
    animation: fadeIn 0.25s ease;
}

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

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-content h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
    padding-bottom: 8px;
    font-weight: 700;
}

/* ========================================
   ダッシュボード
======================================== */
.dashboard {
    margin-bottom: 20px;
}

.dashboard-summary {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    align-items: stretch;
}

.dashboard-stat-card {
    flex: 1;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    padding: 16px 12px;
    text-align: center;
    transition: transform var(--transition-fast);
}

.dashboard-stat-card:hover {
    transform: translateY(-1px);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
}

.stat-number.completed { color: var(--eval-a); }
.stat-number.remaining { color: var(--eval-c); }

.stat-label {
    font-size: 0.75rem;
    color: var(--text-light);
    font-weight: 600;
    margin-top: 4px;
    letter-spacing: 0.5px;
}

/* 進捗リング */
.progress-ring-container {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
}

.progress-ring-container svg {
    transform: rotate(-90deg);
}

.progress-ring-bg {
    fill: none;
    stroke: var(--bg-surface);
    stroke-width: 8;
}

.progress-ring-fill {
    fill: none;
    stroke: var(--eval-a);
    stroke-width: 8;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.6s ease;
}

.progress-ring-text {
    font-size: 0.85rem;
    font-weight: 700;
    fill: var(--primary);
}

/* 評価内訳バッジ */
.dashboard-eval-breakdown {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.eval-pill {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
}

.eval-pill.pill-e { background: var(--eval-e); }
.eval-pill.pill-d { background: var(--eval-d); }
.eval-pill.pill-c { background: var(--eval-c); }
.eval-pill.pill-b { background: var(--eval-b); }
.eval-pill.pill-a { background: var(--eval-a); }
.eval-pill.pill-s { background: var(--eval-s); }
.eval-pill.pill-unlearned { background: #95a5a6; }

/* 7日間カレンダーストリップ */
.calendar-strip {
    display: flex;
    gap: 4px;
    margin-bottom: 16px;
}

.strip-day {
    flex: 1;
    text-align: center;
    padding: 8px 4px;
    border-radius: var(--radius-sm);
    background: var(--bg-surface);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.strip-day:hover {
    border-color: var(--accent);
}

.strip-day.today {
    border-color: var(--accent);
    background: #ebf8ff;
}

.strip-day-label {
    font-size: 0.65rem;
    color: var(--text-light);
    font-weight: 600;
}

.strip-day-num {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
}

.strip-day-count {
    font-size: 0.65rem;
    font-weight: 700;
    margin-top: 2px;
}

.strip-day-count.load-none { color: var(--eval-a); }
.strip-day-count.load-light { color: var(--eval-b); }
.strip-day-count.load-heavy { color: var(--eval-c); }

/* プログレスバー */
.review-progress {
    position: relative;
    margin-bottom: 16px;
}

.review-progress-track {
    height: 6px;
    background: var(--bg-surface);
    border-radius: 3px;
    overflow: hidden;
}

.review-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--eval-a));
    border-radius: 3px;
    transition: width 0.5s ease;
    width: 0%;
}

.review-progress-text {
    position: absolute;
    right: 0;
    top: -20px;
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: 600;
}

/* 科目チップ */
.subject-chips {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}

.subject-chip {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid var(--primary);
    background: var(--primary);
    color: white;
}

.subject-chip.inactive {
    background: transparent;
    color: var(--text-light);
    border-color: var(--border-color);
    text-decoration: line-through;
    opacity: 0.6;
}

.subject-chip:hover {
    transform: scale(1.05);
}

/* 復習コントロール */
.review-controls {
    display: flex;
    gap: 6px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    align-items: center;
}

.review-controls .btn {
    flex: 1;
    padding: 8px 4px;
    font-size: 0.8rem;
}

/* 設定パネル */
.settings-panel {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 100;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: 16px;
    margin-top: 4px;
    min-width: 200px;
}

.settings-group {
    margin-bottom: 12px;
}

.settings-group:last-child {
    margin-bottom: 0;
}

.settings-group label {
    font-size: 0.8rem;
    font-weight: 700;
    display: block;
    margin-bottom: 6px;
    color: var(--text-dark);
}

.settings-group .btn-row {
    display: flex;
    gap: 6px;
}

/* ========================================
   暗記カード
======================================== */
.card-display-area {
    position: relative;
    overflow: hidden;
    min-height: 200px;
}

.theory-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.theory-card:hover {
    box-shadow: var(--shadow-md);
}

.theory-card.card-slide-in-right {
    animation: cardSlideInRight 0.3s ease forwards;
}

.theory-card.card-slide-in-left {
    animation: cardSlideInLeft 0.3s ease forwards;
}

@keyframes cardSlideInRight {
    from { transform: translateX(40px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes cardSlideInLeft {
    from { transform: translateX(-40px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.card-path {
    font-size: 0.8rem;
    color: var(--text-light);
    font-weight: 500;
}

.card-number {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
    flex-shrink: 0;
}

.question-section {
    background: var(--question-bg);
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    border-left: 4px solid var(--primary);
}

.question-section h4 {
    font-size: 0.85rem;
    color: var(--primary);
    margin-bottom: 10px;
    font-weight: 700;
}

.question-section p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.answer-section {
    background: var(--answer-bg);
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    border-left: 4px solid var(--accent);
    transform-origin: top center;
}

.answer-reveal {
    animation: answerReveal 0.35s ease-out;
}

@keyframes answerReveal {
    0% {
        opacity: 0;
        transform: perspective(600px) rotateX(-15deg) translateY(-10px);
    }
    100% {
        opacity: 1;
        transform: perspective(600px) rotateX(0) translateY(0);
    }
}

.answer-section h4 {
    font-size: 0.85rem;
    color: var(--accent);
    margin-bottom: 10px;
    font-weight: 700;
}

.answer-section p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-dark);
    font-weight: 600;
}

.card-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 8px;
}

.current-eval {
    font-size: 0.85rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.eval-badge {
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.8rem;
    display: inline-block;
    color: white;
}

.eval-s { background: var(--eval-s); }
.eval-a { background: var(--eval-a); }
.eval-b { background: var(--eval-b); }
.eval-c { background: var(--eval-c); }
.eval-d { background: var(--eval-d); }
.eval-e { background: var(--eval-e); }

.overdue-warning {
    color: var(--eval-c);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
}

.eval-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.eval-btn {
    flex: 1;
    min-width: 40px;
    padding: 12px 4px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: white;
    position: relative;
    overflow: hidden;
}

.eval-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.15);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.eval-btn:hover::after { opacity: 1; }
.eval-btn:active { transform: scale(0.95); }

.eval-btn-large {
    min-width: 80px;
    padding: 16px 12px;
    font-size: 1rem;
}

.eval-btn-s { background: var(--eval-s); }
.eval-btn-a { background: var(--eval-a); }
.eval-btn-b { background: var(--eval-b); }
.eval-btn-c { background: var(--eval-c); }
.eval-btn-d { background: var(--eval-d); }
.eval-btn-e { background: var(--eval-e); }

/* ========================================
   統計表示（レガシー互換）
======================================== */
.review-header {
    margin-bottom: 20px;
}

.review-stats {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.stat-badge {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    color: white;
}

.stat-total { background: var(--primary); }
.stat-s { background: var(--eval-s); }
.stat-e { background: var(--eval-e); }
.stat-d { background: var(--eval-d); }
.stat-c { background: var(--eval-c); }
.stat-b { background: var(--eval-b); }
.stat-a { background: var(--eval-a); }

/* ========================================
   セレクター・フィルター
======================================== */
.selector-area,
.filter-area {
    background: var(--bg-surface);
    padding: 16px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.selector-row,
.filter-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.selector-row:last-child,
.filter-row:last-child {
    margin-bottom: 0;
}

.selector-row label,
.filter-row label {
    min-width: 80px;
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.9rem;
}

.form-select {
    flex: 1;
    padding: 10px 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    background: white;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.form-select:hover:not(:disabled) { border-color: var(--primary); }

.form-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(66,153,225,0.15);
}

.form-select:disabled {
    background: #ecf0f1;
    cursor: not-allowed;
}

.filter-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    flex: 1;
}

.filter-btn {
    padding: 6px 14px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-dark);
    font-weight: 500;
}

.filter-btn:hover {
    border-color: var(--primary);
    background: var(--bg-surface);
}

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

/* ========================================
   理論リスト
======================================== */
.theory-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.theory-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    transition: all var(--transition-fast);
}

.theory-item:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.theory-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.theory-item-path {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 6px;
}

.theory-item-question {
    font-size: 0.95rem;
    color: var(--text-dark);
    font-weight: 500;
    margin-bottom: 8px;
    line-height: 1.6;
}

.theory-item-info {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 12px;
}

.theory-item-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

/* ========================================
   ボタン
======================================== */
.btn {
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

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

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
}

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

.btn-success { background: var(--eval-a); color: white; }
.btn-success:hover { background: #229954; }

.btn-secondary { background: var(--text-light); color: white; }
.btn-secondary:hover { background: #636e72; }

.btn-warning { background: #6c63ff; color: white; }
.btn-warning:hover { background: #5a52e0; }

.btn-danger { background: var(--eval-c); color: white; }
.btn-danger:hover { background: #c0392b; }

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
    min-width: auto;
}

/* ========================================
   教材構造管理
======================================== */
.structure-item {
    margin-bottom: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: white;
    transition: box-shadow var(--transition-fast);
}

.structure-item:hover { box-shadow: var(--shadow-sm); }

.structure-subject { border-color: var(--primary); }
.structure-book { border-color: var(--eval-a); margin-left: 16px; }
.structure-chapter { border-color: var(--eval-b); margin-left: 32px; }

.structure-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-surface);
    transition: all var(--transition-fast);
}

.structure-subject .structure-header { background: linear-gradient(to right, var(--bg-surface), #e8f4f8); }
.structure-book .structure-header { background: linear-gradient(to right, var(--bg-surface), #e8f5e9); }
.structure-chapter .structure-header { background: linear-gradient(to right, var(--bg-surface), #fff3e0); }
.structure-header:hover { background: #e8e9ef; }

.structure-info { display: flex; align-items: center; gap: 10px; flex: 1; }
.structure-icon { font-size: 1.3rem; }
.structure-name { font-size: 1rem; font-weight: 600; color: var(--text-dark); }

.structure-count {
    padding: 3px 10px;
    background: var(--primary);
    color: white;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 700;
}

.structure-book .structure-count { background: var(--eval-a); }
.structure-chapter .structure-count { background: var(--eval-b); }
.structure-actions { display: flex; gap: 6px; }
.structure-children { padding: 12px; background: white; }
.structure-subject > .structure-children { background: #fafbfc; }
.structure-book > .structure-children { background: #f5f9f5; }

/* ========================================
   バックアップセクション
======================================== */
.backup-section { margin-bottom: 24px; }
.backup-section h4 { font-size: 1.1rem; margin-bottom: 12px; }

.import-options label {
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.import-options label:hover { background: var(--bg-surface); }

.import-options input[type="radio"] {
    cursor: pointer;
    width: 16px;
    height: 16px;
}

/* ========================================
   カレンダー
======================================== */
.calendar-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.calendar-nav-btn {
    padding: 8px 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.calendar-nav-btn:hover { background: var(--primary-light); }

.calendar-title {
    font-size: 1.3rem;
    color: var(--primary);
    font-weight: 700;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 6px;
    margin-bottom: 20px;
}

.calendar-header {
    text-align: center;
    font-weight: 700;
    padding: 8px;
    background: var(--primary);
    color: white;
    border-radius: 6px;
    font-size: 0.8rem;
}

.calendar-day {
    aspect-ratio: 1;
    padding: 6px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.calendar-day:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.calendar-day.empty { border: none; cursor: default; }
.calendar-day.empty:hover { box-shadow: none; }

.calendar-day.today {
    background: #fffbeb;
    border-color: var(--eval-b);
    font-weight: 700;
}

.calendar-day-number { font-size: 1rem; font-weight: 600; margin-bottom: 2px; }

.calendar-day-count {
    font-size: 0.75rem;
    color: var(--text-light);
    background: var(--bg-surface);
    padding: 1px 6px;
    border-radius: 10px;
}

.calendar-day.has-review .calendar-day-count {
    color: white;
    font-weight: 700;
}

/* Heat map levels */
.calendar-day.heat-light {
    background: rgba(66, 153, 225, 0.1);
    border-color: rgba(66, 153, 225, 0.3);
}
.calendar-day.heat-light .calendar-day-count { background: rgba(66, 153, 225, 0.7); }

.calendar-day.heat-medium {
    background: rgba(66, 153, 225, 0.2);
    border-color: rgba(66, 153, 225, 0.5);
}
.calendar-day.heat-medium .calendar-day-count { background: rgba(245, 158, 11, 0.8); }

.calendar-day.heat-heavy {
    background: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.5);
}
.calendar-day.heat-heavy .calendar-day-count { background: rgba(239, 68, 68, 0.8); }

.calendar-day.heat-extreme {
    background: rgba(239, 68, 68, 0.12);
    border-color: rgba(239, 68, 68, 0.5);
}
.calendar-day.heat-extreme .calendar-day-count { background: rgba(239, 68, 68, 0.95); }

.calendar-day.was-studied::after {
    content: '';
    display: block;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--eval-a);
    margin-top: 2px;
}

[data-theme="dark"] .calendar-day.today {
    background: rgba(251, 191, 36, 0.15);
}

.calendar-detail {
    background: var(--bg-surface);
    padding: 16px;
    border-radius: var(--radius-md);
}

/* ========================================
   フォーム
======================================== */
.mode-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.mode-btn {
    flex: 1;
    min-width: 100px;
    padding: 12px 8px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mode-btn:hover { border-color: var(--primary); }

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

/* 設定タブ: 一行ずつのメニュー */
.mode-selector-grid {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 20px;
}

.mode-btn-row {
    width: 100%;
    padding: 14px 16px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    color: var(--text-dark);
}

.mode-btn-row:hover { border-color: var(--primary); background: var(--question-bg); }

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

/* 教材登録サブタブ */
.register-sub-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 16px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid var(--primary);
}

.register-sub-tab {
    flex: 1;
    padding: 10px 12px;
    background: var(--card-bg);
    border: none;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--primary);
}

.register-sub-tab.active {
    background: var(--primary);
    color: white;
}

.form-section {
    background: var(--bg-surface);
    padding: 20px;
    border-radius: var(--radius-md);
}

.form-row { margin-bottom: 16px; }

.form-row label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-dark);
    font-size: 0.9rem;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    transition: all var(--transition-normal);
    line-height: 1.6;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(66,153,225,0.15);
}

.form-textarea { resize: vertical; }

.guide-box {
    background: #e8f5e9;
    border-left: 4px solid var(--eval-a);
    padding: 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}

.guide-box h4 { color: var(--eval-a); margin-bottom: 12px; font-size: 0.95rem; }
.guide-box p { margin-bottom: 8px; line-height: 1.6; }
.guide-box ul { margin-left: 16px; margin-bottom: 12px; }
.guide-box li { margin-bottom: 6px; line-height: 1.6; }

.guide-example {
    background: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-family: monospace;
    font-size: 0.9rem;
}

.guide-note {
    font-size: 0.85rem;
    color: var(--text-light);
    font-style: italic;
}

.form-actions { display: flex; gap: 12px; }

/* ========================================
   モーダル
======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--card-bg, white);
    color: var(--text-dark);
    border-radius: var(--radius-xl);
    padding: 28px;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    max-height: 90dvh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    position: relative;
    animation: modalSlideUp 0.3s ease;
}

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

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-light);
    transition: all var(--transition-fast);
    line-height: 1;
}

.modal-close:hover {
    color: var(--eval-c);
    transform: rotate(90deg);
}

/* ========================================
   Toast通知
======================================== */
#toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-sm);
    color: white;
    font-weight: 600;
    font-size: 0.85rem;
    transform: translateX(120%);
    transition: transform var(--transition-normal);
    pointer-events: auto;
    max-width: 320px;
    box-shadow: var(--shadow-md);
}

.toast-visible { transform: translateX(0); }
.toast-info { background: var(--primary); }
.toast-success { background: var(--eval-a); }
.toast-warning { background: var(--eval-b); }
.toast-error { background: var(--eval-c); }

/* ========================================
   完了セレブレーション
======================================== */
.celebration {
    text-align: center;
    padding: 60px 20px;
    animation: celebrationPop 0.5s ease;
}

@keyframes celebrationPop {
    0% { transform: scale(0.8); opacity: 0; }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); opacity: 1; }
}

.celebration-emoji {
    font-size: 4rem;
    animation: celebrationBounce 1.5s ease infinite;
}

@keyframes celebrationBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.celebration-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-top: 16px;
}

.celebration-subtitle {
    font-size: 1rem;
    color: var(--text-light);
    margin-top: 8px;
}

.celebration-stats {
    margin-top: 20px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   空状態
======================================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state-icon {
    font-size: 3.5rem;
    margin-bottom: 16px;
    animation: gentleFloat 3s ease-in-out infinite;
}

@keyframes gentleFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

.empty-state-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-dark);
}

.empty-state-message {
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ========================================
   レスポンシブ + モバイルボトムナビ
======================================== */
@media (max-width: 768px) {
    body {
        padding: 0;
        padding-top: env(safe-area-inset-top, 0px);
        background: #f0f4f8;
    }

    [data-theme="dark"] body,
    :root:not([data-theme="light"]) body {
        background: var(--body-bg);
    }

    .app-container {
        border-radius: 0;
        padding-bottom: calc(100px + env(safe-area-inset-bottom, 0px));
    }

    .app-header {
        padding: 8px 16px;
        padding-top: calc(8px + env(safe-area-inset-top, 0px));
    }
    .app-header h1 { font-size: 1.1rem; }

    .tab-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 999;
        border-top: 1px solid var(--border-color);
        border-bottom: none;
        background: var(--card-bg, white);
        box-shadow: 0 -2px 10px rgba(0,0,0,0.06);
        justify-content: space-around;
        padding-bottom: env(safe-area-inset-bottom, 0px);
        padding-left: env(safe-area-inset-left, 0px);
        padding-right: env(safe-area-inset-right, 0px);
    }

    .tab-button {
        padding: 8px 4px 6px;
        font-size: 0.6rem;
        min-width: 0;
        flex: 1;
    }

    .tab-icon { display: block; font-size: 1.2rem; }
    .tab-label { font-size: 0.6rem; }

    .tab-button.active::after {
        top: 0;
        bottom: auto;
        border-radius: 0 0 3px 3px;
    }

    .tab-content { padding: 16px; }
    .tab-content h2 { font-size: 1.25rem; }
    .theory-card { padding: 16px; }
    .question-section, .answer-section { padding: 14px; }
    .question-section p, .answer-section p { font-size: 0.95rem; }

    .eval-buttons:not(.eval-buttons-compact) { flex-direction: column; }
    .eval-buttons:not(.eval-buttons-compact) .eval-btn { width: 100%; }

    .selector-row, .filter-row { flex-direction: column; align-items: flex-start; }
    .selector-row label, .filter-row label { min-width: auto; }
    .form-select, .filter-buttons { width: 100%; }

    .calendar-grid { gap: 3px; }
    .calendar-day { padding: 4px; }
    .calendar-day-number { font-size: 0.85rem; }
    .calendar-day-count { font-size: 0.65rem; }

    .form-actions { flex-direction: column; }

    .modal-content {
        width: 95%;
        padding: 20px;
        border-radius: var(--radius-lg);
    }

    .structure-book { margin-left: 8px; }
    .structure-chapter { margin-left: 16px; }
    .structure-name { font-size: 0.9rem; }
    .structure-actions { flex-wrap: wrap; }
    .mode-selector { gap: 6px; }
    .mode-btn { padding: 10px 6px; font-size: 0.8rem; min-width: 0; }
    .mode-selector-grid { gap: 4px; }
    .mode-btn-row { padding: 12px 14px; font-size: 0.85rem; }

    .dashboard-summary { gap: 8px; }
    .stat-number { font-size: 1.5rem; }
    .dashboard-stat-card { padding: 12px 8px; }
    .calendar-strip { gap: 2px; }
    .strip-day { padding: 6px 2px; }
    .strip-day-num { font-size: 0.85rem; }

    #toast-container {
        top: auto;
        bottom: calc(80px + env(safe-area-inset-bottom, 0px));
        right: 12px;
        left: 12px;
    }

    .toast { max-width: none; }

    .review-controls .btn {
        font-size: 0.7rem;
        padding: 7px 2px;
    }

    .theory-item-actions { flex-wrap: wrap; }
    .theory-item-actions .btn { flex: 1; min-width: 0; text-align: center; }
}

/* ========================================
   ユーティリティ
======================================== */
.text-center { text-align: center; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mt-20 { margin-top: 20px; }
.hidden { display: none !important; }

.badge-unlearned {
    background: #95a5a6;
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.65rem;
    margin-left: 4px;
    white-space: nowrap;
    display: inline-block;
    vertical-align: middle;
}

/* ========================================
   統計ダッシュボード
======================================== */

.stats-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}

.stats-summary-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 16px 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
}

.stats-summary-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
}

.stats-summary-label {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 4px;
}

.stats-section {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.stats-section h3 {
    font-size: 0.9rem;
    color: var(--secondary);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.stats-empty {
    text-align: center;
    color: var(--text-light);
    font-size: 0.85rem;
    padding: 20px 0;
}

/* Bar chart */
.bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 2px;
    height: 140px;
    padding-top: 20px;
}

.bar-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    height: 100%;
    min-width: 0;
}

.bar-value {
    font-size: 0.6rem;
    color: var(--text-light);
    margin-bottom: 2px;
    min-height: 12px;
}

.bar {
    width: 100%;
    max-width: 14px;
    background: var(--accent);
    border-radius: 3px 3px 0 0;
    min-height: 1px;
    transition: height 0.3s ease;
}

.bar-col:hover .bar {
    background: var(--primary);
}

.bar-label {
    font-size: 0.55rem;
    color: var(--text-light);
    margin-top: 4px;
    min-height: 12px;
    white-space: nowrap;
}

/* Accuracy SVG chart */
.accuracy-svg {
    width: 100%;
    height: auto;
    max-height: 200px;
}

/* Evaluation distribution */
.eval-dist-bars {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

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

.eval-dist-label {
    font-weight: 700;
    font-size: 0.85rem;
    width: 20px;
    text-align: center;
    color: var(--primary);
}

.eval-dist-bar-bg {
    flex: 1;
    height: 22px;
    background: var(--bg-surface);
    border-radius: 11px;
    overflow: hidden;
}

.eval-dist-bar-fill {
    height: 100%;
    border-radius: 11px;
    transition: width 0.4s ease;
    min-width: 2px;
}

.eval-dist-count {
    font-size: 0.8rem;
    color: var(--text-light);
    min-width: 80px;
    text-align: right;
}

/* Subject progress */
.subject-progress-row {
    margin-bottom: 14px;
}

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

.subject-progress-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-dark);
}

.subject-progress-detail {
    font-size: 0.75rem;
    color: var(--text-light);
}

.subject-progress-bar {
    height: 18px;
    background: var(--bg-surface);
    border-radius: 9px;
    overflow: hidden;
    display: flex;
}

.subject-progress-mastered {
    background: var(--eval-a);
    transition: width 0.4s ease;
}

.subject-progress-learning {
    background: var(--eval-b);
    transition: width 0.4s ease;
}

.subject-progress-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-light);
    margin-top: 4px;
}

/* ========================================
   日別学習目標バー
======================================== */

.daily-goal-bar {
    margin: 8px 0 4px;
}

.daily-goal-label {
    font-size: 0.75rem;
    color: var(--text-light);
    margin-bottom: 4px;
    text-align: center;
}

.daily-goal-track {
    height: 8px;
    background: var(--bg-surface);
    border-radius: 4px;
    overflow: hidden;
}

.daily-goal-fill {
    height: 100%;
    background: var(--accent);
    border-radius: 4px;
    transition: width 0.4s ease;
}

.daily-goal-fill.goal-achieved {
    background: var(--eval-a);
}

/* ========================================
   ショートカットヘルプ
======================================== */

.shortcut-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay, rgba(0,0,0,0.5));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s ease;
}

.shortcut-modal {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    max-width: 360px;
    width: 90%;
    box-shadow: var(--shadow-lg);
}

.shortcut-modal h3 {
    text-align: center;
    color: var(--primary);
    margin-bottom: 16px;
    font-size: 1rem;
}

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

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.shortcut-item kbd {
    display: inline-block;
    min-width: 44px;
    text-align: center;
    padding: 3px 8px;
    font-size: 0.8rem;
    font-family: inherit;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-dark);
    font-weight: 600;
}

.shortcut-item span {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* ========================================
   Help Button
======================================== */
.tab-heading {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.tab-heading h2 {
    margin-bottom: 0;
}

.help-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--primary);
    background: transparent;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    padding: 0;
    line-height: 1;
}

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

.help-modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay, rgba(0,0,0,0.5));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10001;
    animation: fadeIn 0.2s ease;
    backdrop-filter: blur(4px);
}

.help-modal-content {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    max-width: 420px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    color: var(--text-dark);
}

.help-modal-content h3 {
    color: var(--primary);
    margin-bottom: 12px;
    font-size: 1.05rem;
}

.help-modal-content p {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-dark);
    margin-bottom: 16px;
}

.help-modal-content .btn {
    width: 100%;
}

/* ========================================
   Test Mode
======================================== */
.test-setup {
    background: var(--bg-surface);
    padding: 20px;
    border-radius: var(--radius-md);
}

.test-setup .form-row {
    margin-bottom: 16px;
}

.test-progress-bar {
    height: 6px;
    background: var(--bg-surface);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 16px;
}

.test-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--eval-a));
    border-radius: 3px;
    transition: width 0.4s ease;
}

.test-card-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-light);
}

.test-answer-buttons {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.test-answer-buttons .btn {
    flex: 1;
    padding: 14px;
    font-size: 1rem;
    font-weight: 700;
}

.test-result-score {
    text-align: center;
    padding: 30px 0 20px;
}

.test-result-score .score-number {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.test-result-score .score-label {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 8px;
}

.test-result-score .score-detail {
    font-size: 1rem;
    color: var(--text-dark);
    margin-top: 4px;
}

.test-result-section {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

.test-result-section h3 {
    font-size: 0.9rem;
    color: var(--secondary);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.test-eval-bar-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.test-eval-bar-label {
    width: 24px;
    font-weight: 700;
    font-size: 0.85rem;
    text-align: center;
    color: var(--primary);
}

.test-eval-bar-bg {
    flex: 1;
    height: 20px;
    background: var(--bg-surface);
    border-radius: 10px;
    overflow: hidden;
}

.test-eval-bar-fill {
    height: 100%;
    border-radius: 10px;
    transition: width 0.4s ease;
}

.test-eval-bar-pct {
    width: 50px;
    font-size: 0.8rem;
    text-align: right;
    color: var(--text-light);
}

.test-incorrect-item {
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    padding: 12px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.test-incorrect-item:hover {
    border-color: var(--accent);
}

.test-incorrect-item .incorrect-question {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-dark);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.test-incorrect-item .incorrect-detail {
    display: none;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border-color);
}

.test-incorrect-item.expanded .incorrect-detail {
    display: block;
}

.test-incorrect-item .incorrect-detail .question-section,
.test-incorrect-item .incorrect-detail .answer-section {
    margin-bottom: 8px;
}

.test-result-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.test-result-actions .btn {
    flex: 1;
}

/* ========================================
   Guide Modal
======================================== */
.guide-modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--modal-overlay, rgba(0,0,0,0.5));
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10001;
    animation: fadeIn 0.2s ease;
    backdrop-filter: blur(4px);
}

.guide-modal-content {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: 28px;
    max-width: 500px;
    width: 92%;
    max-height: 90vh;
    max-height: 90dvh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: var(--shadow-lg);
    color: var(--text-dark);
}

.guide-step {
    display: flex;
    gap: 14px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.guide-step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.guide-step-content h4 {
    font-size: 0.95rem;
    color: var(--primary);
    margin-bottom: 4px;
}

.guide-step-content p {
    font-size: 0.85rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ========================================
   ログイン/登録画面
======================================== */

.auth-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--body-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 400px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px 32px;
    animation: authFadeIn 0.4s ease;
}

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

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header h1 {
    font-size: 1.8rem;
    color: var(--primary);
    margin-bottom: 4px;
}

.auth-header p {
    font-size: 0.9rem;
    color: var(--text-light);
}

.auth-form h2 {
    font-size: 1.2rem;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-align: center;
}

.auth-field {
    margin-bottom: 16px;
}

.auth-field label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.auth-input {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--input-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: var(--input-bg);
    color: var(--text-dark);
    transition: border-color var(--transition-fast);
    outline: none;
}

.auth-input:focus {
    border-color: var(--accent);
}

.auth-error {
    background: #fee2e2;
    color: #dc2626;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-bottom: 16px;
    border: 1px solid #fecaca;
}

[data-theme="dark"] .auth-error,
:root:not([data-theme="light"]) .auth-error {
    background: #451a1a;
    color: #fca5a5;
    border-color: #7f1d1d;
}

.auth-btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 12px;
}

.auth-btn-primary {
    background: var(--primary);
    color: white;
}

.auth-btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.auth-btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.auth-btn-offline {
    background: transparent;
    color: var(--text-light);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    padding: 10px;
}

.auth-btn-offline:hover {
    background: var(--bg-surface);
}

.auth-switch {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 16px;
}

.auth-switch a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}

.auth-switch a:hover {
    text-decoration: underline;
}

.auth-legal-links {
    text-align: center;
    margin-top: 16px;
    font-size: 0.75rem;
    color: var(--text-light);
}

.auth-legal-links a {
    color: var(--text-light);
    text-decoration: none;
}

.auth-legal-links a:hover {
    text-decoration: underline;
}

/* 法的ページモーダル */
#legal-modal-body h3 {
    font-size: 1rem;
    color: var(--primary);
    margin: 20px 0 8px;
}

#legal-modal-body h4 {
    font-size: 0.9rem;
    color: var(--secondary);
    margin: 12px 0 6px;
}

#legal-modal-body p,
#legal-modal-body li {
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--text-dark);
    margin-bottom: 8px;
}

#legal-modal-body ul,
#legal-modal-body ol {
    padding-left: 20px;
    margin-bottom: 12px;
}

/* ========================================
   コーチング（もぐら先生の声かけ）
======================================== */
.coach-bubble {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 16px;
    margin: 12px 0;
    background: var(--card-bg, white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--primary);
    animation: fadeIn 0.3s ease;
}

.coach-avatar {
    font-size: 1.8rem;
    flex-shrink: 0;
    line-height: 1;
}

.coach-message {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-dark);
}

.coach-message strong {
    color: var(--primary);
}

/* 復帰モーダル */
.coach-comeback-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
    backdrop-filter: blur(4px);
}

.coach-comeback-card {
    background: var(--card-bg, white);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    max-width: 320px;
    width: 90%;
    box-shadow: var(--shadow-lg);
    animation: celebrationPop 0.5s ease;
}

.coach-comeback-avatar {
    font-size: 3.5rem;
    margin-bottom: 12px;
    animation: gentleFloat 3s ease-in-out infinite;
}

.coach-comeback-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.coach-comeback-message {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 20px;
}

.coach-comeback-btn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 12px 32px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.coach-comeback-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.coach-comeback-btn:active {
    transform: scale(0.97);
}