/* ═══════════════════════════════════════════════════
   発音特訓ツール Pro — メインスタイルシート
   ダークモード・グラスモーフィズム・レスポンシブ
   ═══════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ─── デザイントークン ────────────────────────────── */
:root {
    --color-bg: #0b1120;
    --color-bg-gradient: linear-gradient(135deg, #0b1120 0%, #1a1040 50%, #0d1b2a 100%);
    --color-surface: rgba(15, 23, 42, 0.85);
    --color-surface-2: rgba(30, 41, 59, 0.7);
    --color-surface-3: rgba(51, 65, 85, 0.5);
    --color-glass: rgba(30, 41, 59, 0.4);
    --color-glass-border: rgba(100, 116, 139, 0.25);

    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-glow: rgba(99, 102, 241, 0.3);
    --color-accent: #06b6d4;
    --color-accent-glow: rgba(6, 182, 212, 0.25);

    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;

    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px var(--color-primary-glow);

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* ─── リセット & ベース ──────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    background-image: var(--color-bg-gradient);
    background-attachment: fixed;
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 背景のアンビエント光 */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 20%, rgba(99, 102, 241, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ─── コンテナ ───────────────────────────────────── */
.app-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

/* ─── ヘッダー ───────────────────────────────────── */
.app-header {
    text-align: center;
    padding: 16px 0 10px;
    position: relative;
}

.app-title {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #818cf8, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}

.app-subtitle {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* ─── ナビゲーションタブ ─────────────────────────── */
.nav-tabs {
    display: flex;
    justify-content: center;
    gap: 4px;
    padding: 6px;
    background: var(--color-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
}

.nav-tab {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 22px;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--color-text-secondary);
    font-family: var(--font-family);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    white-space: nowrap;
}

.nav-tab:hover {
    color: var(--color-text);
    background: rgba(100, 116, 139, 0.15);
}

.nav-tab.active {
    color: #fff;
    background: var(--color-primary);
    box-shadow: 0 4px 16px var(--color-primary-glow);
}

.nav-tab .tab-icon {
    font-size: 1.1rem;
}

/* ─── ビューコンテナ ─────────────────────────────── */
.view {
    display: none;
    animation: viewFadeIn 0.35s ease-out;
}

.view.active {
    display: block;
}

@keyframes viewFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── グラスカード ────────────────────────────────── */
.glass-card {
    background: var(--color-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
    margin-bottom: 12px;
    transition: all var(--transition-normal);
}

.glass-card:hover {
    border-color: rgba(100, 116, 139, 0.4);
}

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

.card-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text);
}

/* ─── ボタン ─────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-family);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 100%);
    pointer-events: none;
}

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

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

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 4px 12px var(--color-primary-glow);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-light);
    box-shadow: 0 6px 20px var(--color-primary-glow);
}

.btn-accent {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 4px 12px var(--color-accent-glow);
}

.btn-accent:hover:not(:disabled) {
    background: #22d3ee;
}

.btn-success {
    background: var(--color-success);
    color: #fff;
}

.btn-danger {
    background: var(--color-danger);
    color: #fff;
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-glass-border);
}

.btn-ghost:hover:not(:disabled) {
    background: rgba(100, 116, 139, 0.15);
    color: var(--color-text);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    font-size: 1.2rem;
}

.btn-icon.btn-lg {
    width: 56px;
    height: 56px;
    font-size: 1.5rem;
}

/* ─── フォーム要素 ────────────────────────────────── */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 10px 14px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: var(--font-family);
    font-size: 0.92rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.5;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%2394a3b8'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

/* ─── デッキ管理ビュー ───────────────────────────── */
.deck-list {
    display: grid;
    gap: 12px;
    margin-bottom: 20px;
}

.deck-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.deck-item:hover {
    background: rgba(51, 65, 85, 0.6);
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

.deck-item.selected {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-glow);
}

.deck-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-glow);
    border-radius: var(--radius-sm);
    font-size: 1.3rem;
    flex-shrink: 0;
}

.deck-info {
    flex: 1;
    min-width: 0;
}

.deck-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-text);
}

.deck-meta {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.deck-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

/* ─── 練習ビュー ─────────────────────────────────── */
.practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 8px;
}

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

.practice-counter {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    min-width: 80px;
    text-align: center;
}

/* 例文表示カード */
.sentence-card {
    padding: 18px 24px;
    text-align: center;
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.9));
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    margin-bottom: 12px;
    position: relative;
    overflow: hidden;
}

.sentence-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}

.sentence-text {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.6;
    color: var(--color-text);
    margin-bottom: 6px;
    word-break: break-word;
}

.sentence-translation {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    font-style: italic;
}

.sentence-notes {
    margin-top: 12px;
    padding: 12px 18px;
    font-size: 1.5rem; /* サイズをほぼ2倍に */
    color: #ffffff;    /* 灰色のミュートテキストをやめて真っ白でコントラストを上げる */
    background: rgba(99, 102, 241, 0.15); /* 背景色も少し濃くして文字を目立たせる */
    border-left: 4px solid var(--color-primary);
    border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
    text-align: left;
    line-height: 1.6;
    font-weight: 500; /* 少し太くして視認性をさらに向上 */
}

.sentence-notes::before {
    content: '💡 ';
}

/* デッキ管理カード一覧のnotes */
.sp-strip-notes {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 2px;
    font-style: italic;
}

/* 誤認識警告 */
.misrecognition-warning {
    margin-top: 10px;
    padding: 8px 14px;
    font-size: 0.85rem;
    color: #fbbf24;
    background: rgba(251, 191, 36, 0.1);
    border-left: 3px solid #f59e0b;
    border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
    text-align: left;
    line-height: 1.6;
}

#misrecognition-alert {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-left: 4px;
    vertical-align: middle;
}

.misrec-item {
    background: rgba(251, 191, 36, 0.15);
    border: 1px solid rgba(251, 191, 36, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.misrec-delete {
    cursor: pointer;
    font-weight: bold;
    color: #f59e0b;
    padding: 0 2px;
    border-radius: 50%;
    width: 16px;
    height: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    font-size: 0.9rem;
}

.misrec-delete:hover {
    color: #fff;
    background-color: #f59e0b;
}

/* トグルスイッチ */
.practice-nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.display-toggles {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-separator {
    width: 1px;
    height: 16px;
    background-color: var(--color-glass-border);
    margin: 0 4px;
}

.misrec-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    user-select: none;
}

.misrec-toggle input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: #f59e0b;
    cursor: pointer;
}

.misrec-toggle-label {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.misrec-toggle:hover .misrec-toggle-label {
    color: var(--color-text-secondary);
}

/* レベルフィルタ */
.level-filter {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
    width: 100%;
    padding-top: 4px;
}

.level-filter-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-right: 2px;
}

.level-filter-item {
    display: flex;
    align-items: center;
    gap: 2px;
    cursor: pointer;
    user-select: none;
}

.level-filter-item input[type="checkbox"] {
    width: 13px;
    height: 13px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.lf-badge {
    font-size: 0.7rem;
    font-weight: 600;
    padding: 1px 5px;
    border-radius: 3px;
    line-height: 1.4;
}

.lf-0 { color: #94a3b8; }
.lf-1 { color: #f97316; }
.lf-2 { color: #eab308; }
.lf-3 { color: #22c55e; }
.lf-4 { color: #06b6d4; }

.sentence-level-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 600;
    color: #fff;
}

/* 練習コントロール */
.practice-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 12px;
}

.control-panel {
    padding: 12px 16px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-md);
}

.control-panel h3 {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 録音ボタン - 特別なスタイリング */
.btn-record {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 4px 12px var(--color-accent-glow);
}

.btn-record.recording {
    background: var(--color-danger);
    animation: recordPulse 1.5s infinite;
    box-shadow: 0 0 30px rgba(239, 68, 68, 0.4);
}

@keyframes recordPulse {
    0%, 100% { box-shadow: 0 0 20px rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 40px rgba(239, 68, 68, 0.6); }
}

/* 結果表示 */
.result-area {
    min-height: 60px;
    padding: 14px;
    background: rgba(15, 23, 42, 0.5);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-glass-border);
    font-size: 1.1rem;
    line-height: 1.8;
    word-break: break-word;
}

.result-area:empty::before {
    content: 'ここに認識結果が表示されます';
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* 突き合わせ結果 */
.diff-container {
    padding: 14px 16px;
    background: var(--color-surface-2);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-glass-border);
    margin-bottom: 10px;
}

.diff-header {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 10px;
}

.diff-left {
    flex: 1;
    min-width: 0;
}

.diff-title {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}

.diff-result {
    font-size: 1.2rem;
    line-height: 2;
    word-break: break-word;
}

.diff-word {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    margin: 2px;
    transition: all var(--transition-fast);
}

.diff-match {
    background: rgba(34, 197, 94, 0.2);
    color: var(--color-success);
}

.diff-partial {
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-warning);
}

.diff-miss {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-danger);
    text-decoration: line-through;
}

.diff-extra {
    background: rgba(99, 102, 241, 0.2);
    color: var(--color-primary-light);
    font-style: italic;
}

/* スコア表示 */
.score-display {
    text-align: center;
    padding: 4px 12px;
    flex-shrink: 0;
}

.score-value {
    font-size: 1.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.score-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* レベル更新 */
.level-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.level-row-left {
    flex: 1;
    min-width: 0;
}

.level-update {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-top: 4px;
}

.level-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 6px 8px;
    border: 2px solid var(--color-glass-border);
    border-radius: var(--radius-xs);
    background: transparent;
    color: var(--color-text-secondary);
    font-family: var(--font-family);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-width: 52px;
}

.level-btn:hover {
    border-color: var(--level-color);
    color: var(--color-text);
    background: rgba(100, 116, 139, 0.15);
}

.level-btn.active,
.level-btn.suggested {
    border-color: var(--level-color);
    background: var(--level-bg);
    color: var(--color-text);
    box-shadow: 0 0 16px rgba(var(--level-rgb), 0.3);
}

.level-btn .level-number {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1px;
}

/* ショートカットキーヒント */
.kbd-hint {
    display: inline-block;
    padding: 1px 6px;
    margin-left: 4px;
    font-size: 0.65rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 4px;
    vertical-align: middle;
    letter-spacing: 0.02em;
    opacity: 0.7;
}

/* ショートカットガイド */
.shortcut-guide {
    margin-top: 8px;
}

.shortcut-guide summary {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 6px 0;
    user-select: none;
    transition: color var(--transition-fast);
}

.shortcut-guide summary:hover {
    color: var(--color-text-secondary);
}

.shortcut-guide summary::marker {
    font-size: 0.7rem;
}

.shortcut-table {
    width: auto;
    border-collapse: collapse;
    margin-top: 6px;
    font-size: 0.78rem;
}

.shortcut-table td {
    padding: 3px 12px 3px 0;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.shortcut-table td:first-child {
    padding-right: 16px;
    min-width: 70px;
}

.shortcut-table kbd {
    display: inline-block;
    padding: 2px 7px;
    font-size: 0.72rem;
    font-family: var(--font-family);
    font-weight: 600;
    color: var(--color-text);
    background: var(--color-surface-3);
    border: 1px solid var(--color-glass-border);
    border-radius: 4px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* 練習モード選択 */
.mode-select {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.mode-btn {
    padding: 6px 14px;
    border: 1px solid var(--color-glass-border);
    border-radius: 20px;
    background: transparent;
    color: var(--color-text-secondary);
    font-family: var(--font-family);
    font-size: 0.8rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.mode-btn:hover {
    background: rgba(100, 116, 139, 0.15);
}

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

/* ─── ステータスバー ─────────────────────────────── */
.status-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 10px 20px;
    text-align: center;
    font-size: 0.82rem;
    font-weight: 500;
    color: #fff;
    z-index: 100;
    transition: all var(--transition-normal);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.status-bar.status-ready {
    background: rgba(34, 197, 94, 0.85);
}

.status-bar.status-playing {
    background: rgba(99, 102, 241, 0.85);
}

.status-bar.status-recording {
    background: rgba(239, 68, 68, 0.85);
    animation: recordPulse 1.5s infinite;
}

.status-bar.status-error {
    background: rgba(245, 158, 11, 0.85);
}

.status-bar.status-hidden {
    transform: translateY(100%);
    opacity: 0;
}

/* ─── モーダル / ダイアログ ──────────────────────── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 200;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
    animation: modalFadeIn 0.25s ease-out;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--color-surface);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    max-width: 500px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: modalSlideUp 0.3s ease-out;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-title {
    font-size: 1.1rem;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 50%;
    background: var(--color-surface-3);
    color: var(--color-text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-danger);
    color: #fff;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

/* ─── ユーティリティ ──────────────────────────────── */
.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-sm { font-size: 0.82rem; }

.hidden { display: none !important; }

/* ─── スクロールバー ─────────────────────────────── */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-text-muted);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* ─── レスポンシブ ───────────────────────────────── */
@media (max-width: 768px) {
    .app-container {
        padding: 12px;
    }

    .app-title {
        font-size: 1.4rem;
    }

    .nav-tabs {
        gap: 2px;
        padding: 4px;
    }

    .nav-tab {
        padding: 8px 14px;
        font-size: 0.8rem;
        gap: 5px;
    }

    .nav-tab .tab-label {
        display: none;
    }

    .nav-tab .tab-icon {
        font-size: 1.3rem;
    }

    .glass-card {
        padding: 16px;
    }

    .sentence-card {
        padding: 20px;
    }

    .sentence-text {
        font-size: 1.2rem;
    }

    .practice-controls {
        grid-template-columns: 1fr;
    }

    .level-btn {
        min-width: 60px;
        padding: 8px 10px;
        font-size: 0.72rem;
    }

    .level-btn .level-number {
        font-size: 1rem;
    }

    .score-value {
        font-size: 2.2rem;
    }

    .deck-item {
        padding: 12px 16px;
    }
}

@media (max-width: 480px) {
    .practice-nav .btn {
        padding: 8px 12px;
        font-size: 0.8rem;
    }

    .mode-select {
        gap: 4px;
    }

    .mode-btn {
        padding: 5px 10px;
        font-size: 0.75rem;
    }
}

/* ─── body下部のパディング（ステータスバー用） ──── */
body {
    padding-bottom: 50px;
}

/* ─── 辞書確認ボタン ──────────────────────────── */
.dict-lookup {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    margin-top: 4px;
}

.dict-lookup .btn {
    background: rgba(100, 200, 255, 0.15);
    border: 1px solid rgba(100, 200, 255, 0.3);
    color: #7ecfff;
}

.dict-lookup .btn:hover {
    background: rgba(100, 200, 255, 0.3);
}