:root {
  --color-red: #FF0000;
  --color-orange: #FF7F00;
  --color-yellow: #FFFF00;
  --color-green: #00FF00;
  --color-blue: #0000FF;
  --color-indigo: #4B0082;
  --color-violet: #8B00FF;
  --current-color: var(--color-red);
  --text-color: #FFFFFF;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
  transition: background 0.8s ease-in-out, color 0.3s ease;
  background: linear-gradient(135deg, var(--current-color), rgba(0,0,0,0.3));
  color: var(--text-color);
  display: grid;
  grid-template-areas:
    "header"
    "main"
    "stats"
    "input"
    "weather"
    "history";
  grid-template-rows: auto 1fr auto auto auto auto;
  gap: 16px;
  padding: 16px;
  padding-bottom: 80px;
}

/* ヘッダー */
.header {
  grid-area: header;
  text-align: center;
  padding: 20px 0;
}

.header h1 {
  font-size: 1.8em;
  margin-bottom: 8px;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.countdown {
  font-size: 2.5em;
  font-weight: bold;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.countdown span {
  font-size: 1.5em;
}

.date-display {
  margin-top: 8px;
  font-size: 0.9em;
  opacity: 0.9;
}

/* メインエリア */
.main-area {
  grid-area: main;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 250px;
}

.progress-circle {
  width: 180px;
  height: 180px;
  border: 8px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgba(0,0,0,0.15);
  backdrop-filter: blur(10px);
  transition: transform 0.3s ease;
}

.progress-circle:hover {
  transform: scale(1.05);
}

.percentage {
  font-size: 2.8em;
  font-weight: bold;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.progress-text {
  font-size: 1em;
  opacity: 0.9;
}

.color-indicator {
  margin-top: 16px;
  padding: 8px 20px;
  background: rgba(255,255,255,0.2);
  border-radius: 20px;
  font-size: 0.9em;
}

/* 統計パネル */
.stats-panel {
  grid-area: stats;
  display: flex;
  gap: 12px;
  padding: 16px;
  background: rgba(0,0,0,0.2);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  overflow-x: auto;
}

.stat-item {
  flex: 1;
  text-align: center;
  padding: 12px;
  background: rgba(255,255,255,0.1);
  border-radius: 12px;
  min-width: 90px;
}

.stat-item h3 {
  font-size: 0.75em;
  margin-bottom: 6px;
  opacity: 0.9;
}

.stat-item span {
  font-size: 1.5em;
  font-weight: bold;
}

.stat-item .unit {
  font-size: 0.7em;
  font-weight: normal;
}

/* 入力セクション */
.input-section {
  grid-area: input;
  display: flex;
  justify-content: center;
}

#distanceForm {
  display: flex;
  gap: 10px;
  width: 100%;
  max-width: 400px;
}

#distanceInput {
  flex: 1;
  padding: 14px 18px;
  font-size: 1.1em;
  border: none;
  border-radius: 25px;
  background: rgba(255,255,255,0.95);
  color: #333;
  min-width: 0;
}

#distanceInput:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(255,255,255,0.5);
}

button {
  padding: 14px 24px;
  font-size: 1em;
  border: none;
  border-radius: 25px;
  background: rgba(255,255,255,0.95);
  color: #333;
  cursor: pointer;
  font-weight: bold;
  transition: transform 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}

button:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

button:active {
  transform: scale(0.98);
}

/* 天気パネル */
.weather-panel {
  grid-area: weather;
  padding: 16px;
  background: rgba(0,0,0,0.2);
  border-radius: 16px;
  backdrop-filter: blur(10px);
  text-align: center;
}

.weather-info {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

#weatherIcon {
  font-size: 1.8em;
}

#weatherDescription {
  font-size: 1em;
}

.running-condition {
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 0.85em;
  font-weight: bold;
}

/* 履歴セクション */
.history-section {
  grid-area: history;
  padding: 16px;
  background: rgba(0,0,0,0.2);
  border-radius: 16px;
  backdrop-filter: blur(10px);
}

.history-section h3 {
  margin-bottom: 12px;
  font-size: 1em;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 200px;
  overflow-y: auto;
}

.history-item {
  display: flex;
  justify-content: space-between;
  padding: 10px 14px;
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  font-size: 0.9em;
}

.history-item .date {
  opacity: 0.8;
}

.history-item .distance {
  font-weight: bold;
}

.history-empty {
  text-align: center;
  padding: 20px;
  opacity: 0.7;
  font-size: 0.9em;
}

/* 設定ボタン */
.settings-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  font-size: 1.5em;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

/* モーダル */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 20px;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: #fff;
  color: #333;
  padding: 24px;
  border-radius: 16px;
  width: 100%;
  max-width: 400px;
}

.modal-content h2 {
  margin-bottom: 20px;
  font-size: 1.3em;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9em;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 1em;
}

.form-group input:focus {
  outline: none;
  border-color: #667eea;
}

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.form-actions button {
  flex: 1;
}

.btn-cancel {
  background: #e0e0e0;
  color: #333;
}

.btn-save {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #fff;
}

/* レスポンシブ - タブレット */
@media (min-width: 768px) {
  body {
    grid-template-areas:
      "header header"
      "main stats"
      "input weather"
      "history history";
    grid-template-columns: 1.5fr 1fr;
    grid-template-rows: auto 1fr auto auto;
    max-width: 900px;
    margin: 0 auto;
    padding: 24px;
  }

  .progress-circle {
    width: 220px;
    height: 220px;
  }

  .percentage {
    font-size: 3.2em;
  }

  .stats-panel {
    flex-direction: column;
  }
}

/* レスポンシブ - デスクトップ */
@media (min-width: 1024px) {
  body {
    grid-template-areas:
      "header header header"
      "main main stats"
      "input weather stats"
      "history history history";
    grid-template-columns: 1fr 1fr 280px;
    max-width: 1100px;
  }

  .header h1 {
    font-size: 2.2em;
  }

  .countdown {
    font-size: 3em;
  }

  .progress-circle {
    width: 260px;
    height: 260px;
  }

  .percentage {
    font-size: 3.5em;
  }
}

/* アニメーション */
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.pulse {
  animation: pulse 0.3s ease-in-out;
}

/* スクロールバー */
.history-list::-webkit-scrollbar {
  width: 6px;
}

.history-list::-webkit-scrollbar-track {
  background: rgba(255,255,255,0.1);
  border-radius: 3px;
}

.history-list::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.3);
  border-radius: 3px;
}

/* 履歴アイテム - クリック可能 */
.history-item {
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.history-item:hover {
  background: rgba(255,255,255,0.2);
  transform: translateX(4px);
}

.history-item .edit-hint {
  font-size: 0.8em;
  opacity: 0.6;
}

.history-count {
  font-size: 0.8em;
  opacity: 0.7;
  font-weight: normal;
}

/* ウェルカムモーダル */
.welcome-modal {
  text-align: center;
}

.welcome-modal h2 {
  font-size: 1.5em;
  margin-bottom: 12px;
}

.welcome-text {
  color: #666;
  margin-bottom: 24px;
  line-height: 1.6;
}

.btn-welcome {
  width: 100%;
  padding: 16px;
  font-size: 1.1em;
}

/* 危険ゾーン（データ初期化） */
.danger-zone {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid #eee;
}

.danger-zone h4 {
  font-size: 0.9em;
  color: #666;
  margin-bottom: 12px;
}

.btn-danger {
  background: #e74c3c;
  color: #fff;
  width: 100%;
}

.btn-danger:hover {
  background: #c0392b;
}

/* 編集モーダルの削除ボタン */
#editHistoryModal .form-actions {
  flex-wrap: wrap;
}

#editHistoryModal .btn-danger {
  flex: 0 0 100%;
  margin-bottom: 10px;
}

/* 確認ダイアログ風 */
.confirm-text {
  text-align: center;
  margin-bottom: 20px;
  color: #e74c3c;
  font-weight: 500;
}