/* ============================================================
   EX2400英単語 - iOS/iPadOSライク デザインシステム
   ============================================================ */

:root {
  --color-bg-top: #eef2fb;
  --color-bg-bottom: #dfe6f5;
  --color-accent: #007aff;
  --color-accent-2: #5856d6;
  --color-green: #34c759;
  --color-red: #ff3b30;
  --color-orange: #ff9500;
  --color-text: #1c1c1e;
  --color-text-secondary: #6e6e73;
  --color-card-bg: rgba(255, 255, 255, 0.72);
  --color-glass-bg: rgba(255, 255, 255, 0.55);
  --color-glass-border: rgba(255, 255, 255, 0.6);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --header-h: 56px;
  --bottomnav-h: 64px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-strong: 0 20px 60px rgba(0, 0, 0, 0.18);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  height: 100%;
  margin: 0;
  overscroll-behavior: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
    "Inter", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  color: var(--color-text);
  background: linear-gradient(180deg, var(--color-bg-top) 0%, var(--color-bg-bottom) 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

ul { list-style: none; margin: 0; padding: 0; }

.glass {
  background: var(--color-glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--color-glass-border);
}

/* ============================================================
   レイアウト骨格
   ============================================================ */

.app-root {
  position: relative;
  min-height: 100vh;
  padding-top: calc(var(--header-h) + var(--safe-top));
  padding-bottom: calc(var(--bottomnav-h) + var(--safe-bottom) + 12px);
}

.app-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: calc(var(--header-h) + var(--safe-top));
  padding-top: var(--safe-top);
  z-index: 100;
  border-left: none; border-right: none; border-top: none;
}

.app-header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 0 16px;
}

.app-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0;
}

.header-action-btn {
  position: absolute;
  right: 16px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--color-accent);
  font-size: 16px;
}
.header-action-btn:active { background: rgba(0,0,0,0.06); }

.main-content {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 16px 8px;
}

/* ---- ビュー切替 ---- */
.view {
  display: none;
  animation: fadeIn .25s ease;
}
.view.active-view { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.view-lead {
  color: var(--color-text-secondary);
  font-size: 14px;
  margin: 4px 4px 16px;
}

/* ============================================================
   ボトムナビゲーション
   ============================================================ */
.bottom-nav {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: calc(var(--bottomnav-h) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  display: flex;
  z-index: 200;
  border-left: none; border-right: none; border-bottom: none;
}

.nav-btn {
  flex: 1;
  min-height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  font-size: 10px;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: color .15s ease, transform .15s ease;
}
.nav-btn i { font-size: 20px; }
.nav-btn:active { transform: scale(0.92); }
.nav-btn.active-nav { color: var(--color-accent); }

/* ============================================================
   ① ダッシュボード
   ============================================================ */
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.chapter-card {
  background: var(--color-card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-soft);
  min-height: 148px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-align: left;
  transition: transform .15s ease, box-shadow .15s ease;
}
.chapter-card:active { transform: scale(0.97); }
.chapter-card.locked { opacity: 0.45; }

.chapter-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chapter-card-title {
  font-size: 15px;
  font-weight: 700;
}

.chapter-card-range {
  font-size: 11px;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.progress-ring-wrap {
  position: relative;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}
.progress-ring-wrap svg { transform: rotate(-90deg); }
.progress-ring-bg { fill: none; stroke: rgba(0,0,0,0.08); stroke-width: 4; }
.progress-ring-fg {
  fill: none;
  stroke: var(--color-accent);
  stroke-width: 4;
  stroke-linecap: round;
  transition: stroke-dashoffset .4s ease;
}
.progress-ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: var(--color-accent);
}

.chapter-card-btn {
  align-self: flex-start;
  margin-top: 10px;
  min-height: 32px;
  padding: 0 14px;
  border-radius: 20px;
  background: var(--color-accent);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}
.chapter-card-btn:active { transform: scale(0.94); }

/* ============================================================
   ② カード機能
   ============================================================ */
.card-progress-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 4px 4px 20px;
}
.card-progress-track {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: rgba(0,0,0,0.08);
  overflow: hidden;
}
.card-progress-fill {
  height: 100%;
  width: 20%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  border-radius: 3px;
  transition: width .3s ease;
}
.card-progress-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.card-stage {
  position: relative;
  height: 58vh;
  max-height: 460px;
  min-height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-hint {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  color: rgba(0,0,0,0.12);
  z-index: 0;
}
.card-hint-left { left: 4px; }
.card-hint-right { right: 4px; }

.card-deck {
  position: relative;
  width: 100%;
  height: 100%;
  perspective: 1400px;
}

.flash-card {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  cursor: grab;
  transform-style: preserve-3d;
  transition: transform .35s cubic-bezier(.2,.8,.2,1), opacity .3s ease;
  will-change: transform;
}
.flash-card:active { cursor: grabbing; }
.flash-card.flipped .flash-card-inner { transform: rotateY(180deg); }

.flash-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform .5s cubic-bezier(.4,.2,.2,1);
}

.flash-card-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-card-bg);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid rgba(255,255,255,0.75);
  box-shadow: var(--shadow-strong);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 28px;
  text-align: center;
  gap: 12px;
}

.flash-card-face-back { transform: rotateY(180deg); }

.flash-card-pos {
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: var(--color-accent-2);
  padding: 3px 12px;
  border-radius: 12px;
  letter-spacing: 0.03em;
}

.flash-card-word {
  font-size: 34px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.flash-card-phonetic {
  font-size: 15px;
  color: var(--color-text-secondary);
}

.flash-card-tap-tip {
  position: absolute;
  bottom: 20px;
  font-size: 11px;
  color: var(--color-text-secondary);
}

.flash-card-meaning {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.5;
}

.flash-card-example {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  border-top: 1px solid rgba(0,0,0,0.08);
  padding-top: 12px;
  margin-top: 4px;
}
.flash-card-example-ja { font-size: 12px; margin-top: 4px; }

/* スワイプ判定用オーバーレイ */
.swipe-flag {
  position: absolute;
  top: 20px;
  padding: 6px 16px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 16px;
  border: 3px solid;
  opacity: 0;
  transition: opacity .1s ease;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.swipe-flag-known { left: 20px; color: var(--color-green); border-color: var(--color-green); transform: rotate(-12deg); }
.swipe-flag-review { right: 20px; color: var(--color-orange); border-color: var(--color-orange); transform: rotate(12deg); }

.sort-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 18px;
}

.sort-btn {
  min-height: 52px;
  border-radius: 26px;
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 22px;
  box-shadow: var(--shadow-soft);
  transition: transform .15s ease;
}
.sort-btn:active { transform: scale(0.93); }

.sort-btn-review { background: #fff; color: var(--color-orange); border: 2px solid var(--color-orange); }
.sort-btn-known { background: var(--color-green); color: #fff; }
.sort-btn-flip {
  width: 52px;
  height: 52px;
  padding: 0;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-size: 18px;
  justify-content: center;
}

/* ============================================================
   ③ テスト機能
   ============================================================ */
.test-progress-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 4px 4px 18px;
}
.test-progress-track {
  flex: 1;
  height: 6px;
  border-radius: 3px;
  background: rgba(0,0,0,0.08);
  overflow: hidden;
}
.test-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent-2), var(--color-accent));
  border-radius: 3px;
  transition: width .3s ease;
}
.test-progress-label, .test-score-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-secondary);
  white-space: nowrap;
}

.test-question-wrap {
  text-align: center;
  padding: 30px 16px 24px;
}
.test-question-tag {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0 0 8px;
}
.test-question-word {
  font-size: 36px;
  font-weight: 800;
  margin: 0;
  animation: popIn .3s ease;
}
.test-question-phonetic {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 4px;
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

.test-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 0 4px;
}

.test-option-btn {
  min-height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.75);
  box-shadow: var(--shadow-soft);
  font-size: 16px;
  font-weight: 600;
  text-align: left;
  padding: 0 20px;
  display: flex;
  align-items: center;
  transition: transform .12s ease, background .2s ease, border-color .2s ease;
}
.test-option-btn:active { transform: scale(0.98); }

.test-option-btn.correct-flash {
  background: rgba(52, 199, 89, 0.18);
  border-color: var(--color-green);
  animation: correctFlash .5s ease;
}
.test-option-btn.wrong-flash {
  background: rgba(255, 59, 48, 0.14);
  border-color: var(--color-red);
  animation: shake .4s ease;
}

@keyframes correctFlash {
  0% { box-shadow: 0 0 0 0 rgba(52,199,89,0.5); }
  100% { box-shadow: 0 0 0 14px rgba(52,199,89,0); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-8px); }
  40% { transform: translateX(8px); }
  60% { transform: translateX(-6px); }
  80% { transform: translateX(6px); }
}

.test-result-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 20, 30, 0.35);
  backdrop-filter: blur(6px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 500;
  padding: 20px;
}
.test-result-overlay.show { display: flex; }

.test-result-card {
  width: 100%;
  max-width: 320px;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-strong);
  animation: popIn .3s ease;
}
.test-result-icon { font-size: 44px; color: var(--color-orange); margin-bottom: 10px; }
.test-result-title { font-size: 20px; font-weight: 800; margin: 0 0 8px; }
.test-result-score { font-size: 15px; color: var(--color-text-secondary); margin: 0 0 20px; }

.primary-btn {
  width: 100%;
  min-height: 48px;
  border-radius: 24px;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
}
.primary-btn:active { transform: scale(0.96); }

/* ============================================================
   ④ 辞書機能（全語・一枚の本のようなリスト。左右分割やシートは使わない）
   ============================================================ */
.dictionary-layout {
  position: relative;
}

.search-bar-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.search-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  border-radius: 14px;
  padding: 0 14px;
  flex: 1;
}
.search-icon { color: var(--color-text-secondary); font-size: 14px; }
.search-bar input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 15px;
  color: var(--color-text);
  height: 100%;
}
.search-clear-btn { color: var(--color-text-secondary); font-size: 16px; }

.dictionary-count {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-secondary);
  white-space: nowrap;
  padding-right: 2px;
}

/* リスト本体：常に単一カラム、書籍のように上から下へ読む */
.dictionary-list {
  padding-right: 26px; /* A-Zバー分の余白（右端の索引と重ならないように） */
  list-style: none;
  margin: 0;
  padding-left: 0;
}

.dictionary-list-group-label {
  font-size: 13px;
  font-weight: 800;
  color: #fff;
  background: var(--color-accent);
  padding: 3px 10px;
  border-radius: 8px;
  display: inline-block;
  margin: 14px 0 6px;
}

.dictionary-list-item {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 10px;
  padding: 12px 14px;
  background: var(--color-card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  line-height: 1.5;
}

.dict-item-flag-icon { font-size: 13px; flex: 0 0 auto; width: 16px; text-align: center; }
.dict-item-flag-icon .flag-known { color: var(--color-green); }
.dict-item-flag-icon .flag-review { color: var(--color-orange); }

.dict-item-word {
  font-size: 17px;
  font-weight: 800;
  color: var(--color-text);
  flex: 0 0 auto;
}
.dict-item-meaning {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1 1 220px;
  white-space: normal;
  word-break: break-word;
}

.dictionary-list-empty {
  text-align: center;
  color: var(--color-text-secondary);
  padding: 40px 0;
  font-size: 14px;
}

/* A-Zインデックスバー：同一リスト内をジャンプするだけの補助ナビ（左右分割ではない） */
.az-index-bar {
  position: fixed;
  right: 2px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 2px;
  border-radius: 12px;
  z-index: 60;
  user-select: none;
  touch-action: none;
}
.az-index-item {
  font-size: 9px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.5;
  padding: 0 4px;
}

/* ============================================================
   ⑤ 設定
   ============================================================ */
.settings-group {
  border-radius: var(--radius-md);
  padding: 6px 16px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-soft);
}
.settings-group-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 12px 4px 8px;
  margin: 0;
}
.settings-row {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 6px 4px;
  border-top: 1px solid rgba(0,0,0,0.06);
}
.settings-row:first-of-type { border-top: none; }
.settings-row-title { font-size: 15px; font-weight: 600; margin: 0; }
.settings-row-desc { font-size: 13px; color: var(--color-text-secondary); margin: 2px 0 0; }

.settings-action-btn {
  width: 100%;
  min-height: 52px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
  border-top: 1px solid rgba(0,0,0,0.06);
  padding: 6px 4px;
}
.settings-action-btn:first-of-type { border-top: none; }
.settings-action-btn:active { background: rgba(0,0,0,0.03); }
.settings-row-chevron { margin-left: auto; font-size: 12px; color: rgba(0,0,0,0.25); }
.settings-action-danger { color: var(--color-red); }

.settings-footnote {
  font-size: 12px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 0 20px;
}

/* ============================================================
   トースト
   ============================================================ */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(var(--bottomnav-h) + var(--safe-bottom) + 20px);
  transform: translateX(-50%) translateY(20px);
  background: rgba(28,28,30,0.9);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  z-index: 900;
  white-space: nowrap;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================================
   レスポンシブ：iPad / 横画面 / デスクトップ
   ============================================================ */

/* タブレット幅以上：ダッシュボードのカラム数を増やす */
@media (min-width: 700px) {
  .main-content { max-width: 900px; padding: 24px 32px 8px; }
  .chapter-grid { grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .card-stage { max-width: 460px; margin: 0 auto; height: 60vh; }
}

@media (min-width: 1000px) {
  .chapter-grid { grid-template-columns: repeat(4, 1fr); }
}

/* iPad以上でも辞書は左右分割にしない：本のような一枚リストのまま、幅と余白だけ広げる */
@media (min-width: 834px) {
  .dictionary-list { max-width: 720px; margin: 0 auto; padding-right: 30px; }
  .search-bar-wrap { max-width: 720px; margin: 0 auto 12px; }
  .main-content { max-width: 1100px; }
}

/* iPad化に伴い、ボトムナビ自体は「片手操作」思想としてスマホ同様残すが、
   より大画面ではサイドに寄せず中央下部に据え置き、幅を絞る */
@media (min-width: 834px) {
  .bottom-nav {
    max-width: 480px;
    margin: 0 auto;
    left: 0; right: 0;
    border-radius: 24px 24px 0 0;
  }
}

/* 小さすぎる端末向けの微調整 */
@media (max-width: 360px) {
  .flash-card-word { font-size: 28px; }
  .test-question-word { font-size: 28px; }
}