/* ==========================================
   MemoCard - メインスタイルシート v2
   ========================================== */

/* ---------- CSS変数 ---------- */
:root {
  --primary:        #4f7ef8;
  --primary-dark:   #3461d1;
  --primary-light:  #e8effe;
  --secondary:      #6c757d;
  --success:        #28a745;
  --success-light:  #d4edda;
  --danger:         #dc3545;
  --danger-light:   #f8d7da;
  --warning:        #fd7e14;
  --warning-light:  #fff3cd;
  --bg:             #f4f6fb;
  --surface:        #ffffff;
  --border:         #e0e4ef;
  --text-main:      #1e2130;
  --text-sub:       #6b7280;
  --text-light:     #9ca3af;
  --radius-sm:      8px;
  --radius-md:      14px;
  --radius-lg:      20px;
  --shadow-sm:      0 1px 4px rgba(0,0,0,.08);
  --shadow-md:      0 4px 16px rgba(0,0,0,.1);
  --shadow-lg:      0 8px 32px rgba(0,0,0,.14);
  --header-h:       60px;
  --sidebar-w:      220px;
  --transition:     .2s ease;
}

/* ---------- リセット・ベース ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  color-scheme: light;
}
body {
  font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  padding-bottom: env(safe-area-inset-bottom);
  forced-color-adjust: none;
}
button { cursor: pointer; border: none; background: none; font-family: inherit; font-size: 1rem; }
input, textarea, select { font-family: inherit; font-size: 1rem; }
textarea { resize: vertical; }
img { max-width: 100%; }

/* ==============================================
   モバイル・タブレット（〜1023px）：上部ヘッダー
   ============================================== */

/* ヘッダー */
#app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  height: var(--header-h);
  padding-top: env(safe-area-inset-top);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}
.header-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
}
.header-logo i { font-size: 1.4rem; }

/* モバイルナビ */
#main-nav {
  display: flex;
  gap: 4px;
}
.nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-sub);
  font-size: .78rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}
.nav-btn i { font-size: 1.15rem; }
.nav-btn:hover { background: var(--primary-light); color: var(--primary); }
.nav-btn.active { background: var(--primary-light); color: var(--primary); font-weight: 700; }

/* サイドバーはモバイルでは非表示 */
#app-sidebar { display: none; }

/* app-wrapperはモバイルでは普通のブロック */
#app-wrapper { display: block; }

/* メインエリア（モバイル） */
#app-main {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 60px;
}

/* ==============================================
   PC（1024px〜）：サイドバー＋メインの2カラム
   ============================================== */
@media (min-width: 1024px) {

  /* モバイルヘッダーを隠す */
  #app-header { display: none; }

  /* 全体をFlexで横並び */
  #app-wrapper {
    display: flex;
    min-height: 100dvh;
    min-height: 100vh;
    width: 100%;
    overflow: hidden;
  }

  /* ===== 左サイドバー ===== */
  #app-sidebar {
    display: flex;
    flex-direction: column;
    width: var(--sidebar-w);
    min-width: var(--sidebar-w);
    height: 100vh;
    position: sticky;
    top: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    z-index: 50;
    overflow-y: auto;
  }

  .sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 28px 20px 22px;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
  }
  .sidebar-logo i { font-size: 1.4rem; }

  .sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px 12px;
    flex: 1;
  }

  /* サイドバー内のナビボタンを横向きに */
  .sidebar-nav .nav-btn {
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    gap: 12px;
    padding: 11px 16px;
    font-size: .95rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    width: 100%;
    color: var(--text-sub);
  }
  .sidebar-nav .nav-btn i {
    font-size: 1.1rem;
    width: 20px;
    text-align: center;
    flex-shrink: 0;
  }
  .sidebar-nav .nav-btn span { display: block; }
  .sidebar-nav .nav-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
  }
  .sidebar-nav .nav-btn.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
  }

  /* ===== 右メインエリア ===== */
  #app-main {
    flex: 1 1 0;       /* サイドバー以外の残り全幅を占有 */
    min-width: 0;      /* flexコンテンツのはみ出しを防ぐ */
    max-width: none;
    width: 0;          /* flex計算用のヒント（flex:1が優先されるので実質無視） */
    margin: 0;
    padding: 32px 40px 60px;
    overflow-x: hidden;
  }

  /* ページコンテンツの最大幅制限を撤廃してフル幅に */
  .page {
    max-width: 100%;
    width: 100%;
  }

  /* 学習ページ：セッション中のみ 設定(左280px固定) + 問題カード(右) の2カラム */
  #page-study.pc-study-layout.session-active {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 28px;
    align-items: start;
    max-width: none;
  }
  /* 設定画面のみのとき（session-active なし）は通常ブロック＝全幅 */
  #page-study.pc-study-layout:not(.session-active) {
    display: block;
  }
  #page-study.pc-study-layout.session-active #study-setup {
    position: sticky;
    top: 24px;
    margin-bottom: 0;
  }
  #page-study.pc-study-layout.session-active #study-session,
  #page-study.pc-study-layout.session-active #study-result {
    min-width: 0;
  }

  /* 問題文フォントを大きく */
  .question-text { font-size: 1.2rem; }

  /* 統計サマリーを4列 */
  .stats-summary { grid-template-columns: repeat(4, 1fr); }

  /* フィルター行を横並び */
  .filter-row { flex-direction: row; flex-wrap: nowrap; }
  .select-input { min-width: 140px; }

  /* モーダルをセンター表示 */
  .modal-overlay {
    align-items: center;
    padding: 30px;
  }
  .modal {
    border-radius: var(--radius-lg);
    animation: fadeIn .2s ease;
    max-height: 88dvh;
    max-width: 680px;
  }

  /* セッションアクション */
  .session-actions { justify-content: flex-end; }

  /* 選択肢グリッドは維持 */
  .choices-area { gap: 10px; }
}

/* ==============================================
   ページ表示制御
   ============================================== */
.page { display: block; }
.page.hidden { display: none !important; }
.hidden { display: none !important; }

/* ==============================================
   カード
   ============================================== */
.card {
  background: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  padding: 20px;
  margin-bottom: 16px;
}
.card-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
}

/* セクションタイトル */
.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}

/* ==============================================
   ボタン
   ============================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .95rem;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-lg { padding: 13px 28px; font-size: 1rem; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79,126,248,.3); }
.btn-secondary { background: #f0f1f5; color: var(--text-main); }
.btn-secondary:hover { background: #e4e6ed; }
.btn-outline { background: transparent; color: var(--primary); border: 1.5px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-outline-warning { background: transparent; color: var(--warning); border: 1.5px solid var(--warning); }
.btn-outline-warning:hover { background: var(--warning-light); }
.btn-success { background: var(--success); color: #fff; flex: 1; }
.btn-success:hover { background: #218838; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c82333; }
.btn-sm {
  padding: 5px 12px;
  font-size: .82rem;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ==============================================
   学習設定パネル
   ============================================== */
.setup-group { margin-bottom: 20px; }
.setup-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: .9rem;
  margin-bottom: 10px;
  color: var(--text-main);
}

/* タグフィルター */
.tag-filter-area {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 36px;
  padding: 8px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  margin-bottom: 8px;
}
.tag-placeholder { color: var(--text-light); font-size: .9rem; align-self: center; }
.tag-filter-controls { display: flex; gap: 8px; }

/* タグチェックボックス */
.tag-filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: .82rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-sub);
  transition: all var(--transition);
  user-select: none;
}
.tag-filter-chip.selected {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}
.tag-filter-chip input { display: none; }

/* ラジオグループ */
.radio-group { display: flex; flex-wrap: wrap; gap: 8px; }
.radio-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  cursor: pointer;
  font-size: .9rem;
  transition: all var(--transition);
}
.radio-item:has(input:checked) {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}
.radio-item input { display: none; }

/* スライダー */
.accuracy-filter { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.accuracy-label { font-size: .85rem; color: var(--text-sub); white-space: nowrap; min-width: 70px; }
input[type="range"] { flex: 1; accent-color: var(--primary); height: 6px; cursor: pointer; }

/* 出題数コントロール */
.count-control { display: flex; align-items: center; gap: 10px; }
.input-sm {
  width: 80px;
  padding: 8px 10px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 1rem;
}
.input-sm:focus { outline: none; border-color: var(--primary); }
.checkbox-item { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; font-size: .9rem; }

/* 設定アクション */
.setup-actions { display: flex; flex-direction: column; align-items: center; gap: 10px; margin-top: 8px; }
.count-preview { font-size: .9rem; color: var(--text-sub); font-weight: 500; }

/* ==============================================
   学習セッション
   ============================================== */
.session-progress { margin-bottom: 16px; }
.progress-info { text-align: center; font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; color: var(--text-sub); }
.progress-bar-wrap { height: 8px; background: var(--border); border-radius: 99px; overflow: hidden; margin-bottom: 10px; }
.progress-bar { height: 100%; background: linear-gradient(90deg, var(--primary), #7aa2fb); border-radius: 99px; transition: width .4s ease; }
.session-stats-mini { display: flex; justify-content: center; gap: 20px; font-size: .9rem; font-weight: 600; }
.stat-correct { color: var(--success); }
.stat-wrong   { color: var(--danger); }

/* 問題カード */
.question-card { min-height: 200px; }
.card-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; }
.tag-badge {
  padding: 2px 10px;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}
.question-text { font-size: 1.15rem; font-weight: 500; line-height: 1.7; margin-bottom: 20px; white-space: pre-wrap; }

/* 解答エリア共通 */
.answer-area { margin-top: 8px; }
.answer-content, .answer-result { margin-top: 16px; }
.answer-label {
  font-size: .8rem;
  font-weight: 700;
  color: var(--text-sub);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 6px;
}
.answer-text {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.7;
  padding: 12px 16px;
  background: var(--success-light);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--success);
  margin-bottom: 14px;
  white-space: pre-wrap;
}
.answer-memo {
  font-size: .88rem;
  color: var(--text-sub);
  padding: 10px 14px;
  background: var(--warning-light);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--warning);
  margin-bottom: 14px;
  white-space: pre-wrap;
}

/* 解説パネル */
.explanation-panel {
  margin-bottom: 16px;
  border-radius: var(--radius-md);
  border: 1.5px solid #c7d7fd;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8effe 100%);
  overflow: hidden;
  animation: fadeIn .3s ease;
}
.explanation-header {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  font-size: .82rem;
  font-weight: 700;
  color: var(--primary-dark);
  background: rgba(79,126,248,.1);
  border-bottom: 1px solid #c7d7fd;
  letter-spacing: .04em;
  text-transform: uppercase;
}
.explanation-header i {
  color: #f5a623;
  font-size: 1rem;
}
.explanation-text {
  padding: 14px 16px;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--text-main);
  white-space: pre-wrap;
}

/* モーダル内フォームラベルのサブテキスト */
.form-label-sub {
  font-size: .78rem;
  font-weight: 400;
  color: var(--text-sub);
  margin-left: 4px;
}

/* 正誤ボタン */
.judge-buttons { display: flex; gap: 10px; margin-top: 4px; }
.judge-btn { flex: 1; justify-content: center; font-size: 1rem; padding: 13px; transition: all var(--transition); position: relative; }
.judge-btn.selected-correct  { background: var(--success); color: #fff; box-shadow: 0 4px 14px rgba(40,167,69,.4); transform: translateY(-2px); }
.judge-btn.selected-incorrect { background: var(--danger);  color: #fff; box-shadow: 0 4px 14px rgba(220,53,69,.4); transform: translateY(-2px); }
.judge-btn.dimmed { opacity: .35; pointer-events: none; }

/* 自由記述 */
.free-input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  margin-bottom: 12px;
  transition: border-color var(--transition);
  background: var(--bg);
}
.free-input:focus { outline: none; border-color: var(--primary); background: var(--surface); }

/* 選択肢ボタン */
.choices-area { display: flex; flex-direction: column; gap: 9px; }
.choices-area.grid-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.choice-btn {
  padding: 13px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--surface);
  font-size: .95rem;
  font-weight: 500;
  text-align: left;
  line-height: 1.4;
  transition: all var(--transition);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  width: 100%;
}
.choice-btn:hover:not(:disabled):not(.multi-mode) { border-color: var(--primary); background: var(--primary-light); }
.choice-btn.multi-mode { cursor: pointer; user-select: none; }
.choice-btn.multi-mode:hover:not(:disabled) { border-color: var(--primary); background: var(--primary-light); }
.choice-btn.multi-mode.selected { border-color: var(--primary); background: var(--primary-light); color: var(--primary); }
.choice-btn.multi-mode.selected .choice-label { background: var(--primary); color: #fff; }
.choice-btn.correct   { border-color: var(--success); background: var(--success-light); color: var(--success); }
.choice-btn.incorrect { border-color: var(--danger);  background: var(--danger-light);  color: var(--danger);  }
.choice-btn.missed    { border-color: var(--warning);  background: var(--warning-light); color: var(--warning); }
.choice-btn:disabled  { cursor: default; }
.choice-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--border);
  color: var(--text-sub);
  font-size: .78rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: background var(--transition), color var(--transition);
}
.choice-btn.correct   .choice-label { background: var(--success); color: #fff; }
.choice-btn.incorrect .choice-label { background: var(--danger);  color: #fff; }
.choice-btn.missed    .choice-label { background: var(--warning);  color: #fff; }

#btn-submit-choice { margin-top: 10px; width: 100%; justify-content: center; }

.choice-instruction {
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-sub);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

.result-message { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; padding: 10px 14px; border-radius: var(--radius-sm); text-align: center; }
.result-message.correct   { background: var(--success-light); color: var(--success); }
.result-message.incorrect { background: var(--danger-light);  color: var(--danger);  }

/* セッションアクション */
.session-actions { display: flex; justify-content: center; gap: 12px; margin-top: 16px; flex-wrap: wrap; }

/* ==============================================
   セッション結果
   ============================================== */
.result-card { text-align: center; padding: 36px 24px; }
.result-icon { font-size: 3rem; color: var(--primary); margin-bottom: 12px; }
.result-card h2 { font-size: 1.5rem; margin-bottom: 24px; }
.score-circle {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #7aa2fb);
  color: #fff;
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 6px 20px rgba(79,126,248,.4);
}
.score-circle small { font-size: 1rem; }
.result-detail { background: var(--bg); border-radius: var(--radius-sm); padding: 16px; margin-bottom: 24px; text-align: left; }
.result-row { display: flex; justify-content: space-between; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--border); font-size: .95rem; }
.result-row:last-child { border-bottom: none; }
.result-row strong { font-size: 1.1rem; }
.result-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ==============================================
   問題管理ページ
   ============================================== */
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.page-header .section-title { margin-bottom: 0; }

.filter-card { padding: 14px 16px; }
.filter-row { display: flex; gap: 10px; flex-wrap: wrap; }
.search-wrap {
  flex: 1;
  min-width: 180px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text-sub);
}
.search-input { border: none; background: transparent; flex: 1; outline: none; color: var(--text-main); }
.select-input { padding: 8px 12px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); color: var(--text-main); outline: none; min-width: 130px; }
.select-input:focus { border-color: var(--primary); }

/* 問題一覧 */
.question-list { display: flex; flex-direction: column; gap: 10px; }
.q-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.q-card:hover { border-color: var(--primary); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.q-card-left { flex: 1; min-width: 0; }
.q-card-question {
  font-weight: 600;
  font-size: .95rem;
  line-height: 1.5;
  margin-bottom: 6px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.q-card-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 6px; }
.q-card-meta { display: flex; align-items: center; gap: 10px; font-size: .8rem; color: var(--text-sub); }
.q-card-right { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; flex-shrink: 0; }
.accuracy-badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: .8rem; font-weight: 700; }
.accuracy-high { background: var(--success-light); color: var(--success); }
.accuracy-mid  { background: var(--warning-light); color: var(--warning); }
.accuracy-low  { background: var(--danger-light);  color: var(--danger);  }
.accuracy-none { background: var(--bg);            color: var(--text-light); }
.type-badge { padding: 2px 8px; border-radius: 6px; font-size: .75rem; font-weight: 600; background: #f0f1f5; color: var(--text-sub); }

.loading-msg { text-align: center; padding: 40px; color: var(--text-sub); font-size: .95rem; }
.empty-msg   { text-align: center; padding: 48px 20px; color: var(--text-light); }
.empty-msg i { font-size: 3rem; display: block; margin-bottom: 12px; }

/* ==============================================
   統計ページ
   ============================================== */
.stats-summary { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-bottom: 16px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 18px 14px; text-align: center; box-shadow: var(--shadow-sm); }
.stat-icon  { font-size: 1.6rem; color: var(--primary); margin-bottom: 8px; }
.stat-value { font-size: 1.8rem; font-weight: 700; margin-bottom: 4px; }
.stat-label { font-size: .8rem; color: var(--text-sub); }

.tag-stats-list { display: flex; flex-direction: column; gap: 10px; }
.tag-stat-row { display: flex; align-items: center; gap: 10px; }
.tag-stat-name { min-width: 100px; font-size: .9rem; font-weight: 600; }
.tag-stat-bar-wrap { flex: 1; height: 10px; background: var(--bg); border-radius: 99px; overflow: hidden; }
.tag-stat-bar { height: 100%; border-radius: 99px; transition: width .6s ease; }
.tag-stat-pct { font-size: .85rem; font-weight: 600; min-width: 40px; text-align: right; }

.weak-list { display: flex; flex-direction: column; gap: 10px; }
.weak-item { display: flex; align-items: center; gap: 12px; padding: 10px 14px; background: var(--bg); border-radius: var(--radius-sm); }
.weak-rank { font-size: .85rem; font-weight: 700; color: var(--text-light); width: 24px; text-align: center; }
.weak-text { flex: 1; font-size: .9rem; font-weight: 500; line-height: 1.4; }
.weak-acc  { font-size: .85rem; font-weight: 700; color: var(--danger); white-space: nowrap; }

.chart-wrap { position: relative; }

/* ==============================================
   モーダル
   ============================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  backdrop-filter: blur(3px);
}
@media (min-width: 600px) {
  .modal-overlay { align-items: center; padding: 20px; }
}
.modal {
  background: var(--surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  width: 100%;
  max-width: 640px;
  max-height: 92dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  animation: slideUp .25s ease;
}
@media (min-width: 600px) {
  .modal { border-radius: var(--radius-lg); animation: fadeIn .2s ease; }
}
@keyframes slideUp {
  from { transform: translateY(60px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}
@keyframes fadeIn {
  from { opacity: 0; transform: scale(.97); }
  to   { opacity: 1; transform: scale(1); }
}
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px; border-bottom: 1px solid var(--border); flex-shrink: 0; }
.modal-header h3 { font-size: 1.05rem; font-weight: 700; }
.modal-close { width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--text-sub); font-size: 1.1rem; transition: background var(--transition); }
.modal-close:hover { background: var(--bg); }
.modal-body { flex: 1; overflow-y: auto; padding: 20px; display: flex; flex-direction: column; gap: 16px; -webkit-overflow-scrolling: touch; }
.modal-footer { display: flex; align-items: center; justify-content: space-between; padding: 14px 20px; border-top: 1px solid var(--border); flex-shrink: 0; padding-bottom: calc(14px + env(safe-area-inset-bottom)); }
.modal-footer-right { display: flex; gap: 10px; }

/* フォーム */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-weight: 600; font-size: .88rem; color: var(--text-sub); }
.form-label.required::after { content: ' *'; color: var(--danger); }
.form-textarea { padding: 10px 12px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); font-size: .95rem; line-height: 1.6; background: var(--bg); transition: border-color var(--transition); }
.form-textarea:focus { outline: none; border-color: var(--primary); background: var(--surface); }
.form-hint { font-size: .8rem; color: var(--text-sub); display: flex; align-items: center; gap: 4px; }

/* 選択肢エディタ */
.choices-form-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.choices-form-header .form-label { margin-bottom: 0; }
.choices-form-hint { display: flex; gap: 10px; font-size: .78rem; color: var(--text-sub); align-items: center; }
.hint-correct { color: var(--success); font-weight: 600; }
.hint-multi   { color: var(--primary); font-weight: 600; }
.choices-editor { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }
.choice-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  transition: border-color var(--transition);
}
.choice-row:focus-within { border-color: var(--primary); background: var(--surface); }
.choice-row.is-correct { border-color: var(--success); background: var(--success-light); }
.choice-correct-cb { width: 18px; height: 18px; accent-color: var(--success); cursor: pointer; flex-shrink: 0; }
.choice-text-input { flex: 1; border: none; background: transparent; font-size: .93rem; outline: none; color: var(--text-main); min-width: 0; }
.choice-text-input::placeholder { color: var(--text-light); }
.choice-drag-handle { color: var(--text-light); cursor: grab; font-size: .9rem; padding: 2px 4px; flex-shrink: 0; touch-action: none; }
.choice-drag-handle:active { cursor: grabbing; }
.choice-delete-btn { width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--text-light); font-size: .8rem; flex-shrink: 0; transition: background var(--transition), color var(--transition); cursor: pointer; }
.choice-delete-btn:hover { background: var(--danger-light); color: var(--danger); }
.btn-add-choice {
  display: flex; align-items: center; gap: 6px; padding: 7px 14px;
  border-radius: var(--radius-sm); border: 1.5px dashed var(--border);
  background: transparent; color: var(--text-sub); font-size: .88rem;
  font-weight: 600; cursor: pointer; width: 100%; justify-content: center;
  transition: all var(--transition);
}
.btn-add-choice:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

/* タグ入力 */
.tag-input-wrap { border: 1.5px solid var(--border); border-radius: var(--radius-sm); padding: 8px 10px; background: var(--bg); position: relative; transition: border-color var(--transition); }
.tag-input-wrap:focus-within { border-color: var(--primary); background: var(--surface); }
.tag-display-area { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 6px; min-height: 0; }
.tag-input-row { display: flex; gap: 6px; align-items: center; }
.tag-text-input { flex: 1; border: none; background: transparent; font-size: .9rem; outline: none; color: var(--text-main); }
.tag-chip { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 20px; background: var(--primary-light); color: var(--primary); font-size: .82rem; font-weight: 600; }
.tag-chip-remove { display: inline-flex; align-items: center; justify-content: center; width: 14px; height: 14px; border-radius: 50%; background: rgba(79,126,248,.2); color: var(--primary); font-size: .65rem; cursor: pointer; transition: background var(--transition); }
.tag-chip-remove:hover { background: var(--primary); color: #fff; }
.tag-suggestions { position: absolute; left: 0; right: 0; top: 100%; margin-top: 4px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); box-shadow: var(--shadow-md); z-index: 10; max-height: 160px; overflow-y: auto; }
.tag-suggestion-item { padding: 8px 12px; cursor: pointer; font-size: .88rem; transition: background var(--transition); }
.tag-suggestion-item:hover { background: var(--primary-light); color: var(--primary); }

/* 難易度ボタン */
.difficulty-select { display: flex; gap: 6px; flex-wrap: wrap; }
.diff-btn { padding: 6px 12px; border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: var(--bg); color: var(--text-sub); font-size: .85rem; transition: all var(--transition); cursor: pointer; }
.diff-btn.active { border-color: var(--warning); background: var(--warning-light); color: var(--warning); font-weight: 700; }

/* ==============================================
   トースト通知
   ============================================== */
.toast-container {
  position: fixed;
  bottom: calc(20px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  pointer-events: none;
}
.toast {
  background: var(--text-main);
  color: #fff;
  padding: 10px 20px;
  border-radius: 99px;
  font-size: .9rem;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: toastIn .25s ease;
  white-space: nowrap;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }
.toast.warning { background: var(--warning); }
@keyframes toastIn  { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes toastOut { from { opacity: 1; } to { opacity: 0; transform: translateY(8px); } }

/* ==============================================
   既存タグ選択エリア（モーダル内）
   ============================================== */
.existing-tags-area { margin-bottom: 8px; }
.existing-tags-label { font-size: .78rem; font-weight: 700; color: var(--text-sub); margin-bottom: 6px; display: flex; align-items: center; gap: 5px; text-transform: uppercase; letter-spacing: .04em; }
.existing-tags-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.existing-tag-chip {
  display: inline-flex; align-items: center; gap: 4px; padding: 4px 12px;
  border-radius: 20px; font-size: .82rem; font-weight: 600; cursor: pointer;
  border: 1.5px solid var(--border); background: var(--surface); color: var(--text-sub);
  transition: all var(--transition); user-select: none;
}
.existing-tag-chip:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.existing-tag-chip.already-added { border-color: var(--success); background: var(--success-light); color: var(--success); cursor: default; opacity: .65; }

/* ==============================================
   タグ管理
   ============================================== */
.tag-manage-card { padding: 0; overflow: hidden; }
.tag-manage-header { display: flex; align-items: center; gap: 10px; padding: 16px 20px; cursor: pointer; user-select: none; transition: background var(--transition); }
.tag-manage-header:hover { background: var(--bg); }
.tag-manage-count { font-size: .8rem; font-weight: 600; color: var(--text-sub); background: var(--bg); border: 1px solid var(--border); border-radius: 20px; padding: 1px 10px; }
.tag-manage-chevron { margin-left: auto; color: var(--text-light); font-size: .9rem; transition: transform .25s ease; }
.tag-manage-chevron.open { transform: rotate(180deg); }
.tag-manage-body { border-top: 1px solid var(--border); padding: 14px 20px 18px; }
.tag-manage-hint { font-size: .82rem; color: var(--text-sub); margin-bottom: 14px; display: flex; align-items: center; gap: 6px; }
.tag-manage-list { display: flex; flex-direction: column; gap: 6px; }
.tag-manage-row { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--bg); transition: border-color var(--transition); }
.tag-manage-row:hover { border-color: var(--primary); background: var(--primary-light); }
.tag-manage-name { flex: 1; font-size: .93rem; font-weight: 600; color: var(--text-main); }
.tag-manage-qcount { font-size: .78rem; color: var(--text-light); white-space: nowrap; }
.tag-manage-edit-btn { display: inline-flex; align-items: center; gap: 5px; padding: 4px 12px; border-radius: 6px; border: 1.5px solid var(--border); background: var(--surface); color: var(--text-sub); font-size: .8rem; font-weight: 600; cursor: pointer; white-space: nowrap; transition: all var(--transition); flex-shrink: 0; }
.tag-manage-edit-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.tag-rename-old { display: inline-flex; align-items: center; padding: 5px 14px; border-radius: 20px; background: var(--primary-light); color: var(--primary); font-size: .93rem; font-weight: 700; }
.tag-rename-affected { font-size: .85rem; color: var(--text-sub); background: var(--warning-light); border-left: 3px solid var(--warning); border-radius: var(--radius-sm); padding: 8px 12px; display: none; }
.tag-rename-affected.visible { display: block; }

/* ==============================================
   画像添付機能
   ============================================== */

/* モーダル内：画像アップロードセクション */
.img-upload-section {
  margin-top: 8px;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  background: var(--bg);
  transition: border-color var(--transition);
}
.img-upload-section:focus-within { border-color: var(--primary); }
.img-add-controls { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 6px; }
.btn-img-upload {
  display: inline-flex; align-items: center; gap: 5px; padding: 5px 13px;
  border-radius: 6px; border: 1.5px solid var(--border); background: var(--surface);
  color: var(--text-sub); font-size: .82rem; font-weight: 600; cursor: pointer;
  white-space: nowrap; transition: all var(--transition); user-select: none;
}
.btn-img-upload:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }
.btn-img-url {
  display: inline-flex; align-items: center; gap: 5px; padding: 5px 13px;
  border-radius: 6px; border: 1.5px solid var(--border); background: var(--surface);
  color: var(--text-sub); font-size: .82rem; font-weight: 600; cursor: pointer;
  white-space: nowrap; transition: all var(--transition);
}
.btn-img-url:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

/* プレビューエリア */
.img-preview-area { display: flex; flex-wrap: wrap; gap: 8px; }
.img-preview-area:empty { display: none; }
.img-thumb { position: relative; width: 80px; height: 80px; border-radius: var(--radius-sm); overflow: hidden; border: 1.5px solid var(--border); background: var(--bg); flex-shrink: 0; transition: border-color var(--transition); }
.img-thumb:hover { border-color: var(--primary); }
.img-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.img-thumb-del { position: absolute; top: 2px; right: 2px; width: 20px; height: 20px; border-radius: 50%; background: rgba(220,53,69,.85); color: #fff; font-size: .65rem; display: flex; align-items: center; justify-content: center; cursor: pointer; border: none; transition: background var(--transition); z-index: 1; }
.img-thumb-del:hover { background: var(--danger); }
.img-thumb-caption { position: absolute; bottom: 0; left: 0; right: 0; background: rgba(0,0,0,.55); color: #fff; font-size: .6rem; padding: 2px 4px; line-height: 1.3; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }

/* URL入力ポップオーバー */
.img-url-popover { display: none; flex-direction: column; gap: 6px; padding: 8px 0 0; width: 100%; }
.img-url-popover.open { display: flex; }
.img-url-row { display: flex; gap: 6px; align-items: center; }
.img-url-input { flex: 1; padding: 7px 10px; border: 1.5px solid var(--border); border-radius: 6px; font-size: .85rem; background: var(--surface); outline: none; transition: border-color var(--transition); }
.img-url-input:focus { border-color: var(--primary); }
.img-url-add-btn { display: inline-flex; align-items: center; gap: 4px; padding: 7px 12px; border-radius: 6px; background: var(--primary); color: #fff; font-size: .82rem; font-weight: 700; cursor: pointer; border: none; white-space: nowrap; transition: background var(--transition); }
.img-url-add-btn:hover { background: var(--primary-dark); }
.img-url-caption-input { flex: 1; padding: 5px 10px; border: 1.5px solid var(--border); border-radius: 6px; font-size: .82rem; background: var(--surface); outline: none; transition: border-color var(--transition); }
.img-url-caption-input:focus { border-color: var(--primary); }

/* 学習画面：画像表示エリア */
.study-img-area { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
.study-img-area:empty { display: none; margin-bottom: 0; }
.study-img-item { display: flex; flex-direction: column; gap: 4px; max-width: 100%; }
.study-img-item img { max-width: 100%; max-height: 340px; border-radius: var(--radius-sm); border: 1px solid var(--border); object-fit: contain; display: block; cursor: pointer; transition: box-shadow var(--transition); }
.study-img-item img:hover { box-shadow: var(--shadow-md); }
.study-img-caption { font-size: .78rem; color: var(--text-sub); text-align: center; }

/* ライトボックス */
.img-lightbox-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.88); z-index: 9999;
  display: flex; align-items: center; justify-content: center; padding: 16px;
  cursor: zoom-out; animation: fadeIn .18s ease;
}
.img-lightbox-overlay img { max-width: 100%; max-height: 90dvh; border-radius: var(--radius-sm); object-fit: contain; box-shadow: 0 8px 40px rgba(0,0,0,.6); cursor: default; }
.img-lightbox-close { position: absolute; top: 14px; right: 18px; width: 36px; height: 36px; border-radius: 50%; background: rgba(255,255,255,.18); color: #fff; font-size: 1.2rem; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background var(--transition); }
.img-lightbox-close:hover { background: rgba(255,255,255,.32); }

/* ==============================================
   レスポンシブ（小画面）
   ============================================== */
@media (max-width: 600px) {
  .nav-btn span { display: none; }
  .nav-btn { padding: 6px 12px; }
  .header-logo span { font-size: 1rem; }
  .choices-area.grid-2col { grid-template-columns: 1fr; }
  .stats-summary { grid-template-columns: repeat(2, 1fr); }
  .filter-row { flex-direction: column; }
  .select-input { width: 100%; }
  .result-actions { flex-direction: column; }
  .result-actions .btn { width: 100%; justify-content: center; }
}

@media (min-width: 601px) {
  .stats-summary { grid-template-columns: repeat(4, 1fr); }
}

/* ==============================================
   スクロールバー
   ============================================== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* ==============================================
   フォーカスリング（アクセシビリティ）
   ============================================== */
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ==============================================
   問題管理ページヘッダーアクション
   ============================================== */
.page-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* ==============================================
   インポート確認ダイアログ
   ============================================== */
.import-confirm-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 20px;
}
.import-confirm-box {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  max-width: 480px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}
.import-confirm-box h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
}
.import-confirm-box p {
  margin-bottom: 6px;
  font-size: .95rem;
  color: var(--text-main);
}
.import-confirm-sub {
  color: var(--text-sub) !important;
  font-size: .88rem !important;
  margin-top: 10px !important;
}
.import-confirm-btns {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  flex-wrap: wrap;
  margin-top: 20px;
}
.btn-warning-outline {
  background: transparent;
  color: var(--warning);
  border: 1.5px solid var(--warning);
}
.btn-warning-outline:hover { background: var(--warning-light); }