* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
  background: #F0F4F8;
  color: #1E293B;
  min-height: 100vh;
}

/* ===== INDEX: ヘッダー ===== */
.header {
  background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
  color: white;
  padding: 2.5rem 1.5rem 2rem;
  text-align: center;
}

.app-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -1px;
}

.app-subtitle {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-top: 0.35rem;
  font-weight: 400;
}

/* ===== INDEX: カテゴリタブ ===== */
.category-tabs {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.25rem 0;
}

.category-tab {
  flex: 1;
  padding: 0.65rem 0.5rem;
  border-radius: 0.75rem;
  border: 1.5px solid #E2E8F0;
  background: white;
  font-size: 0.8rem;
  font-weight: 700;
  color: #94A3B8;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}

.category-tab.active {
  background: #4F46E5;
  border-color: #4F46E5;
  color: white;
}

/* ===== INDEX: シーングリッド ===== */
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 1.25rem;
}

.scene-card {
  background: white;
  border-radius: 1.125rem;
  padding: 1.5rem 1rem;
  text-align: center;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.scene-card:active {
  transform: scale(0.96);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}

.scene-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 0.6rem;
}

.scene-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: #374151;
  line-height: 1.3;
}

.scene-count {
  font-size: 0.72rem;
  color: #9CA3AF;
  margin-top: 0.35rem;
}

/* ===== SCENE: ヘッダー ===== */
.scene-header {
  background: white;
  border-bottom: 1px solid #E5E7EB;
  padding: 0.875rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

.back-btn {
  background: #F1F5F9;
  border: none;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  color: #4F46E5;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.scene-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #0F172A;
}

/* ===== 練習ボタン ===== */
.practice-btn {
  display: block;
  margin: 1rem 1rem 0;
  background: #0F172A;
  color: white;
  border: none;
  border-radius: 0.875rem;
  padding: 0.875rem;
  width: calc(100% - 2rem);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  text-align: center;
  text-decoration: none;
}

.practice-btn:active { opacity: 0.85; }

/* ===== 練習モード切り替え ===== */
.practice-mode-toggle {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1rem 0;
}

.mode-btn {
  flex: 1;
  padding: 0.65rem;
  border-radius: 0.75rem;
  border: 1.5px solid #E2E8F0;
  background: white;
  font-size: 0.875rem;
  font-weight: 700;
  color: #94A3B8;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
}

.mode-btn.active {
  background: #0F172A;
  border-color: #0F172A;
  color: white;
}

/* ===== 練習カード ===== */
.practice-list {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-bottom: 3rem;
}

.practice-card {
  background: white;
  border-radius: 1rem;
  padding: 1.25rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

.practice-question {
  font-size: 1rem;
  font-weight: 600;
  color: #0F172A;
  margin-bottom: 0.875rem;
  line-height: 1.5;
}

.practice-reveal-btn {
  background: #F1F5F9;
  border: none;
  border-radius: 0.625rem;
  padding: 0.6rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: #475569;
  cursor: pointer;
  font-family: inherit;
}

.practice-reveal-btn:active { background: #E2E8F0; }

.practice-answer {
  border-top: 1px solid #F1F5F9;
  padding-top: 0.875rem;
  margin-top: 0.875rem;
}

.practice-answer-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: #4F46E5;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.practice-en-actions {
  display: flex;
  gap: 0.5rem;
}

.practice-speak-btn,
.practice-close-btn {
  background: none;
  border: 1.5px solid #E2E8F0;
  border-radius: 0.625rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #64748B;
  cursor: pointer;
  font-family: inherit;
}

.practice-speak-btn:active,
.practice-close-btn:active { background: #F8FAFC; }

/* ===== 心構えカード ===== */
.mindset-card {
  margin: 1rem;
  background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
  border-radius: 1.125rem;
  padding: 1.25rem;
  color: white;
}

.mindset-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #94A3B8;
  text-transform: uppercase;
  margin-bottom: 0.875rem;
}

/* フロー */
.mindset-flow {
  display: flex;
  align-items: flex-start;
  gap: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  margin-bottom: 1.125rem;
  scrollbar-width: none;
}

.mindset-flow::-webkit-scrollbar { display: none; }

.flow-step {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
}

.flow-label {
  background: rgba(255,255,255,0.1);
  border-radius: 0.5rem;
  padding: 0.3rem 0.6rem;
  font-size: 0.72rem;
  color: #E2E8F0;
  white-space: nowrap;
  font-weight: 500;
}

.flow-arrow {
  color: #475569;
  font-size: 0.7rem;
  padding: 0 0.3rem;
  flex-shrink: 0;
}

/* 相手の言葉 / 自分の言葉 */
.mindset-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.875rem;
}

.mindset-col-title {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.col-from-them .mindset-col-title { color: #93C5FD; }
.col-from-you  .mindset-col-title { color: #86EFAC; }

.mindset-phrase {
  margin-bottom: 0.5rem;
}

.mindset-phrase-en {
  font-size: 0.78rem;
  font-weight: 600;
  color: #F1F5F9;
  line-height: 1.3;
}

.mindset-phrase-ja {
  font-size: 0.68rem;
  color: #94A3B8;
  margin-top: 0.1rem;
}

/* ===== SCENE: チャンクリスト ===== */
.chunk-list {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-bottom: 3rem;
}

.chunk-card {
  background: white;
  border-radius: 1rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.chunk-main {
  padding: 1rem 0.875rem 1rem 1.125rem;
  display: flex;
  align-items: center;
  gap: 0.625rem;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.chunk-main:active {
  background: #FAFBFF;
}

.chunk-text {
  flex: 1;
  min-width: 0;
}

.chunk-en {
  font-size: 0.975rem;
  font-weight: 600;
  color: #0F172A;
  line-height: 1.4;
}

.chunk-ja {
  font-size: 0.8rem;
  color: #64748B;
  margin-top: 0.2rem;
}

.chunk-level {
  font-size: 0.62rem;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  font-weight: 700;
  flex-shrink: 0;
  white-space: nowrap;
}

.level-beginner {
  background: #DCFCE7;
  color: #166534;
}

.level-intermediate {
  background: #FEF9C3;
  color: #92400E;
}

.expand-btn {
  background: none;
  border: none;
  font-size: 0.8rem;
  cursor: pointer;
  color: #CBD5E1;
  padding: 0.4rem;
  transition: transform 0.2s ease, color 0.2s ease;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
}

.expand-btn.open {
  transform: rotate(180deg);
  color: #4F46E5;
}

/* ===== 枝葉 ===== */
.branch-list {
  border-top: 1px solid #F1F5F9;
  display: none;
}

.branch-list.open {
  display: block;
}

.branch-item {
  padding: 0.7rem 1rem 0.7rem 1.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  border-bottom: 1px solid #F8FAFC;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.branch-item:last-child {
  border-bottom: none;
}

.branch-item:active {
  background: #F8FAFC;
}

.branch-connector {
  color: #CBD5E1;
  font-size: 0.8rem;
  flex-shrink: 0;
  margin-top: 0.15rem;
  font-family: monospace;
}

.branch-text {
  flex: 1;
  min-width: 0;
}

.branch-en {
  font-size: 0.875rem;
  font-weight: 500;
  color: #1E293B;
  line-height: 1.4;
}

.branch-ja {
  font-size: 0.775rem;
  color: #94A3B8;
  margin-top: 0.15rem;
}

.branch-type {
  font-size: 0.6rem;
  padding: 0.12rem 0.4rem;
  border-radius: 999px;
  font-weight: 700;
  flex-shrink: 0;
  white-space: nowrap;
  margin-top: 0.2rem;
  align-self: flex-start;
}

.type-pattern    { background: #EEF2FF; color: #4338CA; }
.type-vocabulary { background: #FDF4FF; color: #7E22CE; }
.type-related    { background: #F0FDF4; color: #166534; }
.type-answer     { background: #FFF7ED; color: #C2410C; }
.type-variation  { background: #F0F9FF; color: #0369A1; }

/* ===== 全画面カードモーダル ===== */
.card-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(3px);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.card-modal.open {
  opacity: 1;
  pointer-events: all;
}

.card-modal-inner {
  background: white;
  border-radius: 1.5rem 1.5rem 0 0;
  padding: 2rem 1.5rem 2.5rem;
  width: 100%;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.32, 0.72, 0, 1);
  position: relative;
}

.card-modal.open .card-modal-inner {
  transform: translateY(0);
}

/* ドラッグハンドル */
.card-handle {
  width: 2.5rem;
  height: 0.25rem;
  background: #E2E8F0;
  border-radius: 999px;
  margin: 0 auto 1.5rem;
}

.card-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: #F1F5F9;
  border: none;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  cursor: pointer;
  font-size: 0.8rem;
  color: #64748B;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-en {
  font-size: 1.7rem;
  font-weight: 800;
  color: #0F172A;
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.card-ja {
  font-size: 1rem;
  color: #475569;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid #F1F5F9;
  line-height: 1.5;
}

.card-nuance {
  font-size: 0.875rem;
  color: #64748B;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  background: #F8FAFC;
  border-radius: 0.75rem;
  padding: 0.875rem 1rem;
}

.card-listen-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #4F46E5, #7C3AED);
  color: white;
  padding: 1rem;
  border-radius: 0.875rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  -webkit-tap-highlight-color: transparent;
}

.card-listen-btn:active {
  opacity: 0.9;
}

/* ===== 文法解説 ===== */
.card-grammar {
  margin-bottom: 1.25rem;
}

.card-grammar-toggle {
  background: none;
  border: 1.5px solid #E2E8F0;
  border-radius: 0.625rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #64748B;
  cursor: pointer;
  font-family: inherit;
  width: 100%;
  text-align: left;
  transition: background 0.15s;
}

.card-grammar-toggle:active { background: #F8FAFC; }
.card-grammar-toggle.open   { border-color: #A5B4FC; color: #4338CA; }

.card-grammar-body {
  display: none;
  background: #F8FAFC;
  border-radius: 0.75rem;
  padding: 1rem;
  margin-top: 0.5rem;
}

.card-grammar-body.open { display: block; }

.grammar-parts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.875rem;
}

.grammar-part {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  max-width: 100%;
  min-width: 0;
}

.grammar-part-text {
  font-size: 0.9rem;
  font-weight: 700;
  color: #0F172A;
  background: white;
  border-radius: 0.4rem;
  padding: 0.3rem 0.5rem;
  border: 1.5px solid #E2E8F0;
  white-space: nowrap;
}

.grammar-part-role {
  font-size: 0.62rem;
  font-weight: 700;
  padding: 0.1rem 0.35rem;
  border-radius: 999px;
  white-space: nowrap;
}

.grammar-part-note {
  font-size: 0.58rem;
  color: #64748B;
  text-align: center;
  word-break: break-word;
  overflow-wrap: anywhere;
  line-height: 1.4;
  max-width: 6rem;
}

.role-s    { background: #DBEAFE; color: #1D4ED8; }
.role-v    { background: #DCFCE7; color: #166534; }
.role-o    { background: #FEF3C7; color: #92400E; }
.role-c    { background: #F3E8FF; color: #7E22CE; }
.role-aux  { background: #EEF2FF; color: #4338CA; }
.role-mod  { background: #F1F5F9; color: #475569; }
.role-conj { background: #FFF1F2; color: #BE123C; }
.role-prep { background: #ECFDF5; color: #065F46; }

.grammar-pattern {
  font-size: 0.78rem;
  font-weight: 700;
  color: #4338CA;
  background: #EEF2FF;
  border-radius: 0.4rem;
  padding: 0.3rem 0.6rem;
  display: inline-block;
  margin-bottom: 0.625rem;
}

.grammar-note {
  font-size: 0.8rem;
  color: #475569;
  line-height: 1.6;
}

/* ===== 返答の例（指差し英会話） ===== */
.card-responses {
  margin-bottom: 1.25rem;
}

.card-responses-toggle {
  background: none;
  border: 1.5px solid #E2E8F0;
  border-radius: 0.625rem;
  padding: 0.5rem 0.875rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #64748B;
  cursor: pointer;
  font-family: inherit;
  width: 100%;
  text-align: left;
  transition: background 0.15s;
  margin-bottom: 0;
}

.card-responses-toggle:active { background: #F8FAFC; }
.card-responses-toggle.open   { border-color: #86EFAC; color: #166534; }

.card-responses-body {
  display: none;
  margin-top: 0.625rem;
}

.card-responses-body.open { display: block; }

.response-cards {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.response-card {
  background: #F8FAFC;
  border: 1.5px solid #E2E8F0;
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  cursor: pointer;
  text-decoration: none;
  display: block;
  width: 100%;
  text-align: left;
  font-family: inherit;
  transition: background 0.15s, border-color 0.15s;
}

.response-card:active {
  background: #EEF2FF;
  border-color: #A5B4FC;
}

.response-card-en {
  font-size: 0.95rem;
  font-weight: 600;
  color: #1E293B;
  line-height: 1.4;
}

.response-card-ja {
  font-size: 0.8rem;
  color: #64748B;
  margin-top: 0.15rem;
}

.pointing-hint {
  text-align: center;
  font-size: 0.7rem;
  color: #CBD5E1;
  margin-top: 0.625rem;
}