/* ========================================
   観光地理クイズ（国内・海外観光地理） - Style
   Travel/Tourism theme, mobile-first PWA
   参考実装: yuusuketominaga/tourisum
   ======================================== */

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #E8F4FD;
  --color-primary: #2196F3;
  --color-primary-dark: #1976D2;
  --color-primary-light: #BBDEFB;
  --color-accent: #FF9800;
  --color-accent-dark: #F57C00;
  --color-success: #4CAF50;
  --color-error: #F44336;
  --color-text: #263238;
  --color-text-secondary: #607D8B;
  --color-white: #FFFFFF;
  --color-card: #FFFFFF;
  --color-border: #E0E0E0;
  --color-overlay: rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  font-size: 16px;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-tap-highlight-color: transparent;
}

body {
  display: flex;
  justify-content: center;
}

/* Hide scrollbars */
::-webkit-scrollbar {
  display: none;
}

* {
  scrollbar-width: none;
}

/* --- App Container --- */
.screen {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: 480px;
  height: 100%;
  display: none;
  flex-direction: column;
  background: var(--color-bg);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.screen.active {
  display: flex;
  opacity: 1;
  animation: fadeIn 0.3s ease forwards;
}

.screen.slide-out-left {
  animation: slideOutLeft 0.3s ease forwards;
}

.screen.slide-in-right {
  animation: slideInRight 0.3s ease forwards;
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes slideOutLeft {
  from { opacity: 1; transform: translateX(-50%); }
  to   { opacity: 0; transform: translateX(calc(-50% - 60px)); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(calc(-50% + 60px)); }
  to   { opacity: 1; transform: translateX(-50%); }
}

@keyframes pulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%      { transform: translateX(-6px); }
  40%      { transform: translateX(6px); }
  60%      { transform: translateX(-4px); }
  80%      { transform: translateX(4px); }
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

@keyframes popIn {
  0%   { transform: scale(0); opacity: 0; }
  70%  { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

/* --- Header --- */
.app-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 16px;
  padding-top: calc(12px + var(--safe-top));
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  font-size: 1.125rem;
  font-weight: 700;
  flex-shrink: 0;
  position: relative;
  min-height: 56px;
}

.app-header h1 {
  font-size: 1.125rem;
  font-weight: 700;
}

.back-button {
  position: absolute;
  left: 12px;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background 0.2s;
}

.back-button:active {
  background: rgba(255, 255, 255, 0.15);
}

/* --- Screen Body --- */
.screen-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  padding-bottom: calc(24px + var(--safe-bottom));
}

/* --- Home Hero --- */
.home-hero {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  box-shadow: var(--shadow-md);
  text-align: center;
  margin-bottom: 16px;
}

.level-badge {
  display: inline-block;
  padding: 6px 20px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: var(--color-white);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}

.streak-display {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
}

.streak-icon {
  font-size: 1.25rem;
}

/* --- Stats Row --- */
.stats-row {
  display: flex;
  justify-content: space-around;
  margin-bottom: 20px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* --- Progress Bar --- */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: var(--radius-pill);
  transition: width 0.5s ease;
}

/* --- Quote Banner --- */
.quote-banner {
  background: rgba(33, 150, 243, 0.08);
  border-left: 3px solid var(--color-primary-light);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  font-style: italic;
  color: var(--color-text-secondary);
  text-align: center;
  line-height: 1.6;
}

/* --- Section --- */
.section {
  margin-bottom: 24px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.section-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.section-header .section-title {
  margin-bottom: 0;
}

.link-button {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  padding: 4px 8px;
}

.link-button:active {
  opacity: 0.7;
}

/* --- Subject Heading (国内観光地理／海外観光地理のグループ見出し) --- */
.subject-heading {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  margin: 4px 0 10px;
}

.subject-heading:not(:first-child) {
  margin-top: 22px;
}

/* --- Unit Grid --- */
.unit-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.unit-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: 16px 14px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
  border: 2px solid transparent;
}

.unit-card:active {
  transform: scale(0.97);
  box-shadow: var(--shadow-md);
}

.unit-card.completed {
  border-color: var(--color-success);
}

.unit-card-icon {
  font-size: 2rem;
  line-height: 1;
}

.unit-card-name {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.unit-card-progress {
  width: 100%;
  height: 4px;
  background: var(--color-border);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.unit-card-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--color-primary);
  border-radius: var(--radius-pill);
  transition: width 0.5s ease;
}

.unit-card-count {
  font-size: 0.7rem;
  color: var(--color-text-secondary);
}

.unit-card-source {
  font-size: 0.6rem;
  color: var(--color-text-secondary);
  opacity: 0.7;
  line-height: 1.3;
  word-break: break-all;
}

.unit-card-pct {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* --- Achievements Row (Home) --- */
.achievements-row {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.achievement-card {
  flex-shrink: 0;
  width: 80px;
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: 12px 8px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
  transition: transform 0.15s;
}

.achievement-card:active {
  transform: scale(0.97);
}

.achievement-card.locked {
  filter: grayscale(100%);
  opacity: 0.45;
}

.achievement-icon {
  font-size: 1.75rem;
  line-height: 1;
}

.achievement-name {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  line-height: 1.3;
}

/* --- Buttons --- */
.btn-primary,
.btn-secondary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 52px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.btn-primary:active {
  transform: scale(0.97);
  opacity: 0.9;
}

.btn-secondary {
  background: var(--color-card);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-secondary:active {
  transform: scale(0.97);
  background: var(--color-primary-light);
}

.btn-icon {
  font-size: 1.125rem;
}

/* --- Quiz Screen --- */
.quiz-header {
  justify-content: space-between;
  padding-left: 48px;
  padding-right: 16px;
}

/* モード表示ラベルは廃止し、クイズ中の単元名表示に転用（長い単元名でもレイアウトが崩れないよう省略表示にする） */
.quiz-mode-label {
  font-size: 0.85rem;
  font-weight: 600;
  opacity: 0.9;
  max-width: 55%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.quiz-progress {
  font-size: 0.85rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.2);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
}

.quiz-body {
  display: flex;
  flex-direction: column;
  position: relative;
}

.quiz-question-area {
  /* flex-shrink:0（basis:auto）にして、画像付きでコンテンツが伸びても
     min-height:160pxまで押し縮められないようにする。押し縮められると
     overflow:visibleのため中身が下の.quiz-choicesに重なって隠れる不具合になる。
     grow:1は維持し、画像なし・短い問題文では従来どおり余白を埋めて中央寄せされる。
     はみ出す場合は親.screen-body(overflow-y:auto)が画面内スクロールを担う。 */
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px 16px;
  min-height: 160px;
}

/* 問題画像（地図・写真参照問題用。無い問では要素ごとhiddenで非表示） */
.quiz-question-image {
  max-width: 100%;
  max-height: 45vh;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.quiz-question {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.7;
  text-align: center;
  color: var(--color-text);
}

/* --- Quiz Choices --- */
.quiz-choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 16px 24px;
}

.quiz-choices button {
  width: 100%;
  min-height: 52px;
  padding: 14px 16px;
  background: var(--color-card);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  text-align: left;
  transition: transform 0.1s, border-color 0.2s, background 0.2s;
  box-shadow: var(--shadow-sm);
  line-height: 1.5;
}

.quiz-choices button:active {
  transform: scale(0.97);
}

.quiz-choices button.selected {
  border-color: var(--color-primary);
  background: rgba(33, 150, 243, 0.06);
}

.quiz-choices button.correct {
  border-color: var(--color-success);
  background: rgba(76, 175, 80, 0.1);
  color: var(--color-success);
  animation: pulse 0.4s ease;
}

.quiz-choices button.wrong {
  border-color: var(--color-error);
  background: rgba(244, 67, 54, 0.08);
  color: var(--color-error);
  animation: shake 0.4s ease;
}

.quiz-choices button:disabled {
  cursor: default;
  opacity: 0.85;
}

/* --- Quiz Result Overlay --- */
.quiz-result {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--color-card);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.12);
  padding: 28px 20px;
  padding-bottom: calc(28px + var(--safe-bottom));
  transform: translateY(100%);
  /* 未回答時は完全に非表示・非干渉にする。bottom:0はスクロール可能な
     .screen-body自身の（コンテンツ量ではなく）レイアウト上の高さを基準に
     計算されるため、画像で中身が伸びてスクロールが発生すると、
     transformだけでは「非表示のはずの座標」が選択肢群の位置と重なり、
     スクロール時に露出して下の選択肢のクリックを奪ってしまう。
     visibility:hiddenとpointer-events:noneで見た目・操作の両方を無効化する。
     非表示への切替はtransition-delayでtransformのスライドダウン完了後に行う。 */
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), visibility 0s linear 0.35s;
  z-index: 10;
}

.quiz-result.visible {
  transform: translateY(0);
  visibility: visible;
  pointer-events: auto;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), visibility 0s linear 0s;
}

.quiz-result-inner {
  text-align: center;
}

.quiz-result-mark {
  font-size: 3rem;
  margin-bottom: 12px;
  animation: popIn 0.4s ease;
}

.quiz-explanation {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  text-align: left;
}

/* --- Result Screen --- */
.result-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.result-hero {
  padding: 32px 16px 24px;
}

.result-title {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.1em;
}

.result-score {
  font-size: 3.5rem;
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 8px;
  animation: popIn 0.5s ease;
}

.result-accuracy {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.result-message {
  font-size: 1rem;
  color: var(--color-accent-dark);
  font-weight: 600;
}

.result-stats {
  display: flex;
  justify-content: space-around;
  width: 100%;
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.result-achievements {
  width: 100%;
  margin-bottom: 24px;
}

.result-achievements .achievement-card {
  width: 100%;
  flex-direction: row;
  justify-content: flex-start;
  gap: 12px;
  padding: 14px 16px;
  margin-bottom: 8px;
  animation: slideUp 0.4s ease;
}

.result-achievements .achievement-name {
  font-size: 0.85rem;
  text-align: left;
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  padding: 0 8px;
}

/* --- Achievements Screen --- */
.achievements-title {
  text-align: center;
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding-bottom: 24px;
}

.achievements-grid .achievement-card {
  width: 100%;
  padding: 16px 10px;
}

.achievements-grid .achievement-icon {
  font-size: 2rem;
  margin-bottom: 4px;
}

.achievements-grid .achievement-name {
  font-size: 0.7rem;
}

/* --- Utility --- */
.hidden {
  display: none !important;
}

/* --- Responsive Tweaks --- */
@media (min-width: 400px) {
  .quiz-question {
    font-size: 1.2rem;
  }

  .unit-grid {
    gap: 14px;
  }
}

@media (min-width: 480px) {
  .screen-body {
    padding: 20px 24px;
  }
}

/* --- Dark mode support (optional, respects system) --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0D1B2A;
    --color-card: #1B2838;
    --color-text: #E8F4FD;
    --color-text-secondary: #90A4AE;
    --color-border: #37474F;
  }

  .app-header {
    background: linear-gradient(135deg, #1565C0 0%, #0D47A1 100%);
  }

  .quote-banner {
    background: rgba(33, 150, 243, 0.12);
  }

  .quiz-choices button {
    background: var(--color-card);
    color: var(--color-text);
  }

  .quiz-result {
    background: var(--color-card);
  }
}