:root {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --card-bg: #1e1e1e;
  
  /* ボタン枠線用カラー */
  --color-primary: #4fc3f7;   
  --color-success: #00e676;   
  --color-warning: #ffb300;   
  --color-danger:  #ff5252;   
  --color-gray:    #9e9e9e;   
}

html, body {
  /* 画面全体のスクロール・バウンドを完全に固定 */
  overscroll-behavior: none;
  overflow: hidden;
  
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

/* ズーム防止 (連打時の拡大を防ぐ) */
button, input {
  touch-action: manipulation;
}

.container {
  width: 100%;
  max-width: 400px;
  padding: 15px;
  box-sizing: border-box;
  
  /* --- 修正箇所：内部スクロールを有効にし、画面の高さを固定 --- */
  height: 100vh;
  height: 100dvh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  -webkit-overflow-scrolling: touch;
}

h1 {
  text-align: center;
  font-size: 1.3rem;
  margin: 5px 0 15px 0;
  color: #ffffff;
}

.hidden {
  display: none !important;
}

/* --- メイン画面のカードレイアウト --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 15px;
}

.stats-card {
  background-color: var(--card-bg);
  border: 1px solid #333;
  border-radius: 8px;
  padding: 10px;
  text-align: center;
}
.count-card {
  grid-column: span 2; /* 台数は目立たせるために2列ぶち抜き */
}

.stat-label {
  font-size: 0.8rem;
  color: #aaaaaa;
  margin-bottom: 5px;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: bold;
  color: #ffffff;
}
.count-card .stat-value {
  font-size: 2.2rem;
}

.unit {
  font-size: 0.8rem;
  color: #aaaaaa;
  margin-left: 2px;
}

/* --- ボタン共通スタイル --- */
.btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}
.btn-group-bottom {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 10px;
}

.btn {
  background-color: transparent;
  font-size: 0.95rem;
  font-weight: bold;
  padding: 12px 8px;
  border-radius: 6px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s ease;
  outline: none;
}
.btn:active {
  opacity: 0.7;
}

.btn-start { border: 2px solid var(--color-success); color: var(--color-success); }
.btn-calc { border: 2px solid var(--color-primary); color: var(--color-primary); }
.btn-rest { border: 2px solid var(--color-warning); color: var(--color-warning); }
.btn-rest.resting { background-color: rgba(255, 179, 0, 0.2); }
.btn-edit { border: 2px solid var(--color-gray); color: var(--color-gray); }
.btn-complete { border: 2px solid var(--color-success); color: var(--color-success); width: 100%; margin-bottom: 10px; }
.btn-cancel { border: 2px solid var(--color-gray); color: var(--color-gray); width: 100%; }
.btn-small { background-color: transparent; border: 1px solid var(--color-primary); color: var(--color-primary); padding: 4px 8px; border-radius: 4px; font-size: 0.8rem; }
.btn-delete { background-color: transparent; border: 1px solid var(--color-danger); color: var(--color-danger); padding: 6px; border-radius: 4px; font-size: 0.8rem; margin-left: 5px; }

#loadingMsg {
  text-align: center;
  color: var(--color-primary);
  font-size: 0.9rem;
  display: none;
  margin-bottom: 10px;
}

/* --- 編集画面のスタイル --- */
.edit-section {
  background-color: var(--card-bg);
  border: 1px solid #333;
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 15px;
}
.edit-label {
  display: block;
  font-size: 0.85rem;
  color: #aaaaaa;
  margin-bottom: 8px;
}
.edit-input {
  width: 100%;
  background-color: #121212;
  border: 1px solid #555;
  color: #fff;
  padding: 10px;
  border-radius: 4px;
  box-sizing: border-box;
  font-size: 1rem;
}

.counter-group {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-counter {
  background-color: transparent;
  border: 1px solid var(--color-gray);
  color: var(--text-color);
  width: 50px;
  height: 45px;
  font-size: 1.5rem;
  border-radius: 4px;
}
.counter-input {
  text-align: center;
  flex: 1;
  font-size: 1.5rem;
  font-weight: bold;
}

.rest-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

/* 休憩リストが増えた時だけスクロールさせる */
#restHistoryList {
  max-height: 180px; 
  overflow-y: auto;
  padding-right: 5px;
}

.rest-item {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid #333;
}
.rest-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}
.rest-time-inputs {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
}
.rest-time-inputs input {
  padding: 6px;
  font-size: 0.9rem;
}

/* --- 修正箇所：編集画面のフッターを画面下部に固定 --- */
.edit-footer {
  position: sticky;
  bottom: -15px; /* containerのpadding分を調整 */
  background-color: var(--bg-color);
  padding: 15px 0;
  margin-top: auto;
  z-index: 10;
  border-top: 1px solid #333;
}:root {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --card-bg: #1e1e1e;
  
  /* ボタン枠線用カラー */
  --color-primary: #4fc3f7;   
  --color-success: #00e676;   
  --color-warning: #ffb300;   
  --color-danger:  #ff5252;   
  --color-gray:    #9e9e9e;   
}

html, body {
  /* 画面全体のスクロール・バウンドを完全に固定 */
  overscroll-behavior: none;
  overflow: hidden;
  
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

/* ズーム防止 (連打時の拡大を防ぐ) */
button, input {
  touch-action: manipulation;
}

.container {
  width: 100%;
  max-width: 400px;
  padding: 15px;
  box-sizing: border-box;
  
  /* --- 修正箇所：内部スクロールを有効にし、画面の高さを固定 --- */
  height: 100vh;
  height: 100dvh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  -webkit-overflow-scrolling: touch;
}

h1 {
  text-align: center;
  font-size: 1.3rem;
  margin: 5px 0 15px 0;
  color: #ffffff;
}

.hidden {
  display: none !important;
}

/* --- メイン画面のカードレイアウト --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 15px;
}

.stats-card {
  background-color: var(--card-bg);
  border: 1px solid #333;
  border-radius: 8px;
  padding: 10px;
  text-align: center;
}
.count-card {
  grid-column: span 2; /* 台数は目立たせるために2列ぶち抜き */
}

.stat-label {
  font-size: 0.8rem;
  color: #aaaaaa;
  margin-bottom: 5px;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: bold;
  color: #ffffff;
}
.count-card .stat-value {
  font-size: 2.2rem;
}

.unit {
  font-size: 0.8rem;
  color: #aaaaaa;
  margin-left: 2px;
}

/* --- ボタン共通スタイル --- */
.btn-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 10px;
}
.btn-group-bottom {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 10px;
}

.btn {
  background-color: transparent;
  font-size: 0.95rem;
  font-weight: bold;
  padding: 12px 8px;
  border-radius: 6px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s ease;
  outline: none;
}
.btn:active {
  opacity: 0.7;
}

.btn-start { border: 2px solid var(--color-success); color: var(--color-success); }
.btn-calc { border: 2px solid var(--color-primary); color: var(--color-primary); }
.btn-rest { border: 2px solid var(--color-warning); color: var(--color-warning); }
.btn-rest.resting { background-color: rgba(255, 179, 0, 0.2); }
.btn-edit { border: 2px solid var(--color-gray); color: var(--color-gray); }
.btn-complete { border: 2px solid var(--color-success); color: var(--color-success); width: 100%; margin-bottom: 10px; }
.btn-cancel { border: 2px solid var(--color-gray); color: var(--color-gray); width: 100%; }
.btn-small { background-color: transparent; border: 1px solid var(--color-primary); color: var(--color-primary); padding: 4px 8px; border-radius: 4px; font-size: 0.8rem; }
.btn-delete { background-color: transparent; border: 1px solid var(--color-danger); color: var(--color-danger); padding: 6px; border-radius: 4px; font-size: 0.8rem; margin-left: 5px; }

#loadingMsg {
  text-align: center;
  color: var(--color-primary);
  font-size: 0.9rem;
  display: none;
  margin-bottom: 10px;
}

/* --- 編集画面のスタイル --- */
.edit-section {
  background-color: var(--card-bg);
  border: 1px solid #333;
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 15px;
}
.edit-label {
  display: block;
  font-size: 0.85rem;
  color: #aaaaaa;
  margin-bottom: 8px;
}
.edit-input {
  width: 100%;
  background-color: #121212;
  border: 1px solid #555;
  color: #fff;
  padding: 10px;
  border-radius: 4px;
  box-sizing: border-box;
  font-size: 1rem;
}

.counter-group {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-counter {
  background-color: transparent;
  border: 1px solid var(--color-gray);
  color: var(--text-color);
  width: 50px;
  height: 45px;
  font-size: 1.5rem;
  border-radius: 4px;
}
.counter-input {
  text-align: center;
  flex: 1;
  font-size: 1.5rem;
  font-weight: bold;
}

.rest-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

/* 休憩リストが増えた時だけスクロールさせる */
#restHistoryList {
  max-height: 180px; 
  overflow-y: auto;
  padding-right: 5px;
}

.rest-item {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid #333;
}
.rest-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}
.rest-time-inputs {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
}
.rest-time-inputs input {
  padding: 6px;
  font-size: 0.9rem;
}

/* --- 修正箇所：編集画面のフッターを画面下部に固定 --- */
.edit-footer {
  position: sticky;
  bottom: -15px; /* containerのpadding分を調整 */
  background-color: var(--bg-color);
  padding: 15px 0;
  margin-top: auto;
  z-index: 10;
  border-top: 1px solid #333;
}