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

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #64748b;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-sub: #64748b;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --nav-height: 56px;
}

html, body {
  height: 100%;
  font-family: 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  -webkit-tap-highlight-color: transparent;
}

/* ===== ナビゲーション ===== */
.nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  z-index: 100;
  box-shadow: 0 -2px 8px rgba(0,0,0,0.06);
}

.nav-btn {
  flex: 1;
  border: none;
  background: none;
  font-size: 13px;
  color: var(--color-text-sub);
  cursor: pointer;
  padding: 8px 4px;
  transition: color 0.15s, background 0.15s;
}

.nav-btn.active {
  color: var(--color-primary);
  font-weight: 700;
  background: #eff6ff;
}

/* ===== 画面共通 ===== */
.screen {
  display: none;
  min-height: 100vh;
  padding-bottom: calc(var(--nav-height) + 24px);
  padding-top: 16px;
}

.screen.active {
  display: block;
}

.screen-header {
  padding: 0 16px 12px;
}

.screen-header h1 {
  font-size: 22px;
  font-weight: 700;
}

.subtitle {
  font-size: 13px;
  color: var(--color-text-sub);
  margin-top: 4px;
}

/* ===== 検索バー ===== */
.search-bar {
  display: flex;
  align-items: center;
  margin: 0 16px 10px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: 24px;
  padding: 0 14px;
  gap: 8px;
  transition: border-color 0.15s;
}

.search-bar:focus-within {
  border-color: var(--color-primary);
}

.search-icon {
  font-size: 15px;
  flex-shrink: 0;
}

.search-bar input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 15px;
  padding: 12px 0;
  background: transparent;
  color: var(--color-text);
}

.search-bar input::placeholder {
  color: #94a3b8;
}

.search-clear {
  flex-shrink: 0;
  border: none;
  background: #e2e8f0;
  border-radius: 50%;
  width: 22px;
  height: 22px;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #64748b;
}

/* ===== 学年タブ ===== */
.grade-tabs {
  display: flex;
  padding: 0 12px;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  margin-bottom: 12px;
}

.grade-tabs::-webkit-scrollbar {
  display: none;
}

.grade-tab {
  flex-shrink: 0;
  padding: 6px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

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

/* ===== 漢字グリッド ===== */
.kanji-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 8px;
  padding: 0 16px;
  margin-bottom: 16px;
}

.kanji-row-header {
  grid-column: 1 / -1;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-primary);
  background: #eff6ff;
  border-radius: 6px;
  padding: 4px 10px;
  margin-top: 4px;
}

.kanji-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}

.kanji-cell.selected {
  background: #eff6ff;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.kanji-cell.correct {
  background: #f0fdf4;
  border-color: var(--color-success);
}

.kanji-cell.incorrect {
  background: #fef2f2;
  border-color: var(--color-danger);
}

/* ===== 選択画面フッター ===== */
.select-footer {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  position: sticky;
  bottom: var(--nav-height);
}

.select-footer-sub {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.practice-count {
  font-size: 14px;
  color: var(--color-text-sub);
  text-align: center;
}

.practice-count span {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 18px;
}

/* ===== ボタン ===== */
.btn-primary {
  width: 100%;
  padding: 14px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary:active {
  background: var(--color-primary-dark);
}

.btn-secondary {
  width: 100%;
  padding: 14px;
  background: var(--color-surface);
  color: var(--color-secondary);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-secondary:active {
  background: #f1f5f9;
}

.btn-danger {
  width: 100%;
  padding: 14px;
  background: var(--color-surface);
  color: var(--color-danger);
  border: 1.5px solid var(--color-danger);
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-danger:active {
  background: #fef2f2;
}

/* ===== 練習画面 ===== */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--color-text-sub);
}

.empty-state p {
  margin-bottom: 20px;
  font-size: 15px;
}

.empty-state .btn-primary {
  max-width: 200px;
  margin: 0 auto;
}

.practice-content {
  padding: 0 16px;
}

/* 進行状況バー */
.progress-bar-wrap {
  height: 6px;
  background: var(--color-border);
  border-radius: 3px;
  margin-bottom: 6px;
  overflow: hidden;
}

.progress-bar-inner {
  height: 100%;
  background: var(--color-primary);
  border-radius: 3px;
  transition: width 0.3s;
  width: 0%;
}

.progress-label {
  font-size: 13px;
  color: var(--color-text-sub);
  text-align: right;
  margin-bottom: 12px;
}

/* 漢字情報 */
.kanji-info {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
}

.kanji-reading {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.kanji-example {
  font-size: 14px;
  color: var(--color-text-sub);
}

/* 筆順ガイド */
.stroke-guide-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.stroke-guide {
  flex: 1;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.stroke-guide svg {
  width: 100%;
  height: auto;
  max-height: 80px;
}

.btn-hint {
  flex-shrink: 0;
  padding: 10px 14px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

/* 書き取りCanvas */
.canvas-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 12px;
}

#draw-canvas {
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
  touch-action: none;
  cursor: crosshair;
  width: min(300px, calc(100vw - 32px));
  height: min(300px, calc(100vw - 32px));
}

/* 操作ボタン */
.practice-actions {
  display: grid;
  grid-template-columns: 1fr 1fr 2fr;
  gap: 8px;
  margin-bottom: 12px;
}

/* 判定結果 */
.result-area {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.result-mark {
  font-size: 56px;
  margin-bottom: 8px;
  line-height: 1;
}

.result-mark.mark-correct { color: var(--color-success); }
.result-mark.mark-delta   { color: #d97706; }
.result-mark.mark-wrong   { color: var(--color-danger); }

.result-score {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text-sub);
}

.result-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

/* ===== 進捗画面 ===== */
.progress-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding: 0 16px 16px;
}

.summary-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 16px 8px;
  text-align: center;
  box-shadow: var(--shadow);
}

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

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

.weak-section {
  padding: 0 16px 16px;
}

.progress-footer {
  padding: 0 16px;
}

/* ===== 学年別進捗 ===== */
.grade-breakdown-section {
  padding: 0 16px 16px;
}

.grade-breakdown-section h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}

.grade-row {
  display: grid;
  grid-template-columns: 28px 1fr 52px 36px;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.grade-row-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-text-sub);
}

.grade-row-bar-wrap { width: 100%; }

.grade-row-bar-bg {
  height: 10px;
  background: var(--color-border);
  border-radius: 5px;
  overflow: hidden;
}

.grade-row-bar-fill {
  height: 100%;
  background: var(--color-primary);
  border-radius: 5px;
  transition: width 0.4s;
}

.grade-row-stat {
  font-size: 12px;
  font-weight: 700;
  text-align: right;
  white-space: nowrap;
}

.grade-row-stat span { font-weight: 400; color: var(--color-text-sub); }

.grade-row-rate {
  font-size: 12px;
  font-weight: 700;
  text-align: right;
}

.rate-good { color: var(--color-success); }
.rate-mid  { color: #d97706; }
.rate-low  { color: var(--color-danger); }

/* ===== 苦手セクションヘッダー ===== */
.weak-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.weak-header h2 {
  font-size: 16px;
  font-weight: 700;
}

.btn-add-weak {
  padding: 6px 14px;
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

/* ===== 漢字詳細ポップアップ ===== */
.kanji-detail {
  position: fixed;
  bottom: calc(var(--nav-height) + 16px);
  left: 16px;
  right: 16px;
  max-width: 448px;
  margin: 0 auto;
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  z-index: 150;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.kanji-detail-close {
  position: absolute;
  top: 12px;
  right: 12px;
  border: none;
  background: none;
  font-size: 18px;
  cursor: pointer;
  color: var(--color-text-sub);
  padding: 4px 8px;
}

.kanji-detail-char {
  font-size: 64px;
  line-height: 1;
  font-weight: 700;
}

.kanji-detail-reading {
  font-size: 14px;
  color: var(--color-text-sub);
}

.kanji-detail-stats {
  font-size: 14px;
  color: var(--color-text-sub);
  text-align: center;
}

.kanji-detail-stats b { color: var(--color-text); }

.kanji-detail-actions {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

/* ===== 筆順アニメーションモーダル ===== */
.stroke-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.stroke-modal.open {
  display: flex;
}

.stroke-modal-inner {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 20px;
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.stroke-modal-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.stroke-modal-title {
  font-size: 15px;
  font-weight: 700;
}

.stroke-modal-close {
  border: none;
  background: none;
  font-size: 18px;
  cursor: pointer;
  color: var(--color-text-sub);
  padding: 4px 8px;
}

.stroke-modal-svg {
  width: 220px;
  height: 220px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  margin-bottom: 16px;
}

.stroke-modal-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 4px;
}

.stroke-modal-step {
  font-size: 15px;
  font-weight: 700;
  min-width: 60px;
  text-align: center;
}

/* ===== 筆順モーダル：スピード選択 ===== */
.modal-speed-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
}

.modal-speed-label {
  font-size: 13px;
  color: var(--color-text-sub);
}

.btn-speed {
  font-size: 13px;
  font-weight: 700;
  padding: 5px 16px;
  border-radius: 20px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-sub);
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

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

/* ===== なぞり書きガイドトグル ===== */
.guide-toggle-wrap {
  display: flex;
  justify-content: center;
  margin-top: 6px;
}

.btn-guide-toggle {
  font-size: 12px;
  padding: 4px 14px;
  border-radius: 20px;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-sub);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.btn-guide-toggle:active {
  background: var(--color-border);
}

/* ===== ユーティリティ ===== */
@media (min-width: 480px) {
  .screen {
    max-width: 480px;
    margin: 0 auto;
  }
  .nav {
    max-width: 480px;
    left: 50%;
    transform: translateX(-50%);
  }
}