/* ==========================================
   ゆっくりていねい筆算 CSS
   プレフィックス: addition-hissan-
   ========================================== */

/* ==========================================
   CSS変数定義（統一カラーコンセプト）
   ========================================== */
.addition-hissan-wrap {
  /* ベースカラー（70%） */
  --base: #FFFFFF;
  --base-light: #FAFAFA;
  --base-dark: #F5F5F5;
  
  /* メインカラー（25%） */
  --main: #1e3a5f;
  --main-light: #2d5a8f;
  --main-dark: #0f1e3a;
  
  /* アクセントカラー（5%） */
  --accent: #d4af37;
  --accent-light: #f4cf5f;
  --accent-dark: #b8941f;
  
  /* テキストカラー */
  --text: #2C3E50;
  --text-light: #7F8C8D;
  
  /* ボーダー */
  --border: #E8E8E8;
  
  /* シャドウ */
  --shadow: 0 4px 20px rgba(30, 58, 95, 0.1);
  --shadow-hover: 0 8px 30px rgba(30, 58, 95, 0.15);
  
  /* セル設定 */
  --cell: 85px; 
  --gap: 10px;
  
  /* UI密度（画面モードで切替） */
  --ui-pad: 12px;
  --ui-font: 16px;
  --ui-radius: 20px;
}

/* ==========================================
   リセット & 基本レイアウト
   ========================================== */
.addition-hissan-wrap * {
  box-sizing: border-box !important;
  margin: 0 !important;
  padding: 0 !important;
}

.addition-hissan-wrap {
  width: 100% !important;
  max-width: 600px !important;
  margin: 0 auto !important;
  padding: 10px !important;
  font-family: "UD Digi Kyokasho N-R", "Noto Sans JP", sans-serif !important;
  color: var(--text) !important;
  background: linear-gradient(135deg, #FFFFFF 0%, #F8F9FA 50%, #F0F2F5 100%) !important;
  border-radius: 8px !important;
}

/* 画面モード：設定（密度高め＝コンパクト） */
.addition-hissan-wrap.addition-hissan-mode-setup {
  --ui-pad: 12px;
  --ui-font: 16px;
  --cell: 72px;
}

/* 画面モード：計算（密度低め＝大きく見やすい） */
.addition-hissan-wrap.addition-hissan-mode-calc {
  --ui-pad: 20px;
  --ui-font: 18px;
  --cell: 85px;
}

/* ==========================================
   ヘッダー（ブランドアイデンティティ）
   ========================================== */
.addition-hissan-header {
  background: linear-gradient(135deg, var(--main-light) 0%, var(--main) 100%) !important;
  border-top: 3px solid var(--accent) !important;
  border-bottom: 3px solid var(--accent) !important;
  border-radius: 16px !important;
  padding: 12px !important;
  box-shadow: 0 4px 16px rgba(30, 58, 95, 0.25) !important;
  margin-bottom: 12px !important;
  width: 100% !important;
  position: relative !important;
  overflow: hidden !important;
}

/* 光沢エフェクト */
.addition-hissan-header::before {
  content: '' !important;
  position: absolute !important;
  top: 0 !important;
  left: -100% !important;
  width: 200% !important;
  height: 100% !important;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.2), transparent) !important;
  animation: additionHissanShine 4s infinite !important;
  pointer-events: none !important;
}

@keyframes additionHissanShine {
  0% { left: -100%; }
  100% { left: 100%; }
}

.addition-hissan-header h1 {
  color: #ffffff !important;
  font-weight: 900 !important;
  text-align: center !important;
  font-size: clamp(20px, 3.5vw, 26px) !important;
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3) !important;
  letter-spacing: 0.05em !important;
  position: relative !important;
  z-index: 1 !important;
}

/* ==========================================
   設定エリア
   ========================================== */
.addition-hissan-setup-area {
  background: var(--base) !important;
  border: 2px solid var(--border) !important;
  border-radius: 20px !important;
  padding: 14px !important;
  box-shadow: var(--shadow) !important;
  margin-bottom: 12px !important;
  display: flex !important;
  flex-direction: row !important;
  gap: 10px !important;
  align-items: center !important;
  justify-content: center !important;
  flex-wrap: nowrap !important;
  width: 100% !important;
  position: relative !important;
}

/* 上部アクセントライン */
.addition-hissan-setup-area::before {
  content: '' !important;
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  height: 4px !important;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--accent)) !important;
  border-radius: 24px 24px 0 0 !important;
}

.addition-hissan-num-input {
  border: 2px solid var(--border) !important;
  border-radius: 14px !important;
  padding: 8px !important;
  font-size: clamp(18px, 2.5vw, 22px) !important;
  font-weight: 700 !important;
  background: var(--base) !important;
  color: var(--text) !important;
  outline: none !important;
  transition: all 0.3s ease !important;
  width: 80px !important;
  text-align: center !important;
}

.addition-hissan-num-input:focus {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.15) !important;
  transform: scale(1.03) !important;
}

.addition-hissan-num-input:hover {
  border-color: var(--main-light) !important;
}

.addition-hissan-plus-sign {
  font-size: 24px !important;
  font-weight: 900 !important;
  color: var(--main) !important;
}

/* ==========================================
   ボタン
   ========================================== */
.addition-hissan-btn {
  border: none !important;
  border-radius: 14px !important;
  padding: 10px 20px !important;
  font-weight: 900 !important;
  cursor: pointer !important;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
  font-size: clamp(14px, 2vw, 16px) !important;
}

.addition-hissan-btn-start {
  background: linear-gradient(135deg, var(--main-light) 0%, var(--main) 100%) !important;
  color: #ffffff !important;
  box-shadow: 0 4px 12px rgba(30, 58, 95, 0.3) !important;
}

.addition-hissan-btn-start:hover {
  background: linear-gradient(135deg, var(--main) 0%, var(--main-dark) 100%) !important;
  transform: translateY(-3px) !important;
  box-shadow: 0 8px 20px rgba(30, 58, 95, 0.4) !important;
}

.addition-hissan-btn-start:active {
  transform: translateY(0) !important;
}

.addition-hissan-btn-next {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 100%) !important;
  color: var(--main-dark) !important;
  box-shadow: 0 4px 12px rgba(212, 175, 55, 0.3) !important;
  font-size: clamp(16px, 2.5vw, 19px) !important;
  padding: 12px 30px !important;
  width: 100% !important;
  max-width: 300px !important;
}

.addition-hissan-btn-next:hover {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%) !important;
  transform: translateY(-3px) !important;
  box-shadow: 0 8px 20px rgba(212, 175, 55, 0.4) !important;
}

.addition-hissan-btn-next:active {
  transform: translateY(0) !important;
}

.addition-hissan-btn-reset {
  background: var(--base) !important;
  color: var(--main) !important;
  border: 2px solid var(--main) !important;
  box-shadow: 0 2px 8px rgba(30, 58, 95, 0.1) !important;
  font-size: clamp(13px, 1.8vw, 15px) !important;
  padding: 8px 16px !important;
}

.addition-hissan-btn-reset:hover {
  background: var(--main) !important;
  color: var(--accent) !important;
  transform: translateY(-3px) !important;
  box-shadow: 0 6px 16px rgba(30, 58, 95, 0.3) !important;
}

/* ボタンエリアを横並びに */
.addition-hissan-bottom-buttons {
  display: flex !important;
  gap: 10px !important;
  justify-content: center !important;
  align-items: center !important;
  width: 100% !important;
  margin-top: 20px !important;
  flex-wrap: wrap !important;
}

/* 下部ボタン2つを「同じ行」で揃える（次へ が width:100% を持っているため上書き） */
.addition-hissan-bottom-buttons {
  flex-wrap: nowrap !important;
}

.addition-hissan-bottom-buttons .addition-hissan-btn-next,
.addition-hissan-bottom-buttons .addition-hissan-btn-reset {
  width: auto !important;
  flex: 1 1 220px !important;
  max-width: 300px !important;
}

/* 画面が狭いときだけ折り返し可 */
@media (max-width: 420px) {
  .addition-hissan-bottom-buttons {
    flex-wrap: wrap !important;
  }
}

/* ==========================================
   筆算エリア
   ========================================== */
.addition-hissan-calc-container {
  background: var(--base) !important;
  border: 2px solid var(--border) !important;
  border-radius: 24px !important;
  padding: var(--ui-pad) !important;
  box-shadow: 0 10px 35px rgba(30, 58, 95, 0.12) !important;
  display: none;
  flex-direction: column !important;
  align-items: center !important;
  width: 100% !important;
  position: relative !important;
  font-size: var(--ui-font) !important;
}

/* 全画面時のレイアウト */
.addition-hissan-calc-container:fullscreen {
  width: 100vw !important;
  height: 100vh !important;
  max-width: none !important;
  border-radius: 0 !important;
  padding: 14px !important;
  overflow: auto !important;
  background: linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%) !important;
  
  /* 全画面時は計算領域（マス）を大きくする */
  --cell: clamp(86px, 9vh, 140px) !important;
  --gap: clamp(8px, 1.2vh, 14px) !important;
  --ui-font: 20px !important;
}

/* 計算画面ツールバー（全画面ボタン） */
.addition-hissan-calc-toolbar {
  width: 100% !important;
  display: flex !important;
  gap: 10px !important;
  justify-content: flex-end !important;
  align-items: center !important;
  margin-bottom: 10px !important;
}

.addition-hissan-btn-ghost {
  background: #ffffff !important;
  color: #0f172a !important;
  border: 2px solid #cbd5e1 !important;
  box-shadow: none !important;
  padding: 8px 16px !important;
  font-size: 14px !important;
}

.addition-hissan-btn-ghost:active {
  transform: translateY(2px) !important;
}

/* 拡大縮小UI（全画面のときだけ表示） */
.addition-hissan-zoom-ui {
  display: none !important;
}

.addition-hissan-calc-container:fullscreen .addition-hissan-zoom-ui {
  display: flex !important;
  position: fixed !important;
  right: 14px !important;
  bottom: 14px !important;
  z-index: 2147483647 !important;
  gap: 8px !important;
  padding: 10px !important;
  border-radius: 16px !important;
  background: rgba(255, 255, 255, 0.86) !important;
  border: 1px solid rgba(15, 23, 42, 0.10) !important;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.20) !important;
  backdrop-filter: blur(6px) !important;
}

.addition-hissan-zoom-ui .addition-hissan-zlabel {
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  min-width: 72px !important;
  padding: 10px 12px !important;
  border-radius: 12px !important;
  border: 1px solid #e5e7eb !important;
  background: #fff !important;
  font-weight: 900 !important;
  font-size: 14px !important;
}

.addition-hissan-zoom-ui button {
  padding: 10px 12px !important;
  border-radius: 12px !important;
  border: 2px solid #1e3a5f !important;
  background: #fff !important;
  color: #1e3a5f !important;
  font-weight: 900 !important;
  cursor: pointer !important;
  box-shadow: 0 2px 8px rgba(30, 58, 95, 0.10) !important;
  font-size: 14px !important;
}

.addition-hissan-zoom-ui button:hover {
  background: #1e3a5f !important;
  color: #d4af37 !important;
}

.addition-hissan-zoom-ui button:active {
  transform: translateY(1px) !important;
}

/* 上部アクセントライン */
.addition-hissan-calc-container::before {
  content: '' !important;
  position: absolute !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  height: 4px !important;
  background: linear-gradient(90deg, var(--accent), var(--accent-light), var(--accent)) !important;
  border-radius: 28px 28px 0 0 !important;
}

/* ==========================================
   ガイドメッセージ
   ========================================== */
.addition-hissan-guide-box {
  background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%) !important;
  border: 3px solid var(--accent) !important;
  color: var(--main-dark) !important;
  padding: 14px !important;
  border-radius: 18px !important;
  margin-bottom: 20px !important;
  text-align: center !important;
  font-size: clamp(15px, 2.2vw, 18px) !important;
  font-weight: 700 !important;
  line-height: 1.6 !important;
  width: 100% !important;
  min-height: 80px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  position: relative !important;
  box-shadow: inset 0 2px 8px rgba(212, 175, 55, 0.08) !important;
}

/* 吹き出し風矢印 */
.addition-hissan-guide-box::after {
  content: '' !important;
  position: absolute !important;
  bottom: -12px !important;
  left: 50% !important;
  transform: translateX(-50%) !important;
  border-width: 12px 12px 0 !important;
  border-style: solid !important;
  border-color: var(--accent) transparent transparent transparent !important;
}

/* ==========================================
   筆算グリッド
   ========================================== */
.addition-hissan-grid {
  display: grid !important;
  grid-template-columns: repeat(4, var(--cell)) !important;
  gap: var(--gap) !important;
  margin: 10px 0 20px 0 !important;
  position: relative !important;
}

/* 「＋」を左余白に固定表示（グリッド外） */
.addition-hissan-plus-outside {
  position: absolute !important;
  left: calc(var(--cell) * -0.70) !important;
  top: calc(var(--cell) + var(--gap) + (var(--cell) / 2)) !important; /* 2段目の中央 */
  transform: translateY(-50%) !important;
  font-size: clamp(40px, 7vw, 56px) !important;
  font-weight: 900 !important;
  color: var(--main) !important;
  text-shadow: 0 2px 0 rgba(15,23,42,.10) !important;
  pointer-events: none !important;
}

/* ==========================================
   セル
   ========================================== */
.addition-hissan-cell {
  width: var(--cell) !important;
  height: var(--cell) !important;
  border: 3px solid var(--border) !important;
  border-radius: 16px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  font-size: clamp(36px, 6vw, 44px) !important;
  font-weight: 900 !important;
  background: var(--base) !important;
  position: relative !important;
  color: var(--text) !important;
  transition: all 0.3s ease !important;
}

.addition-hissan-cell-empty {
  border-color: transparent !important;
  background: transparent !important;
}

/* 横線（筆算の線） */
.addition-hissan-line {
  grid-column: 1 / -1 !important;
  height: 5px !important;
  background: linear-gradient(90deg, var(--main), var(--main-light)) !important;
  border-radius: 3px !important;
  margin: -8px 0 !important;
  z-index: 10 !important;
  box-shadow: 0 2px 4px rgba(30, 58, 95, 0.2) !important;
}

/* ==========================================
   ハイライト（計算中の位）
   ========================================== */
.addition-hissan-col-active {
  background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%) !important;
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.3), 0 4px 12px rgba(212, 175, 55, 0.4) !important;
  z-index: 5 !important;
  transform: scale(1.08) !important;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
}

/* ==========================================
   繰り上がり小窓（右上）
   ========================================== */
.addition-hissan-carry-box {
  position: absolute !important;
  top: -14px !important;
  right: -14px !important;
  width: 36px !important;
  height: 36px !important;
  border: 3px solid #ef4444 !important;
  border-radius: 10px !important;
  background: linear-gradient(135deg, #fff 0%, #fee 100%) !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  z-index: 20 !important;
  font-size: 20px !important;
  font-weight: 900 !important;
  color: #ef4444 !important;
  box-shadow: 0 3px 8px rgba(239, 68, 68, 0.3) !important;
  opacity: 0 !important;
  transform: scale(0) !important;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
}

.addition-hissan-carry-box.addition-hissan-show {
  opacity: 1 !important;
  transform: scale(1) !important;
}

/* 使用済みの繰り上がり斜線 */
.addition-hissan-carry-box.addition-hissan-used {
  color: #94a3b8 !important;
  border-color: #cbd5e1 !important;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%) !important;
}

.addition-hissan-carry-box.addition-hissan-used::after {
  content: '' !important;
  position: absolute !important;
  width: 80% !important;
  height: 3px !important;
  background: linear-gradient(90deg, #0f172a, #334155) !important;
  top: 50% !important;
  left: 50% !important;
  transform: translate(-50%, -50%) rotate(-45deg) !important;
  opacity: 0 !important;
  animation: additionHissanDrawLine 0.4s forwards !important;
  
  /* 見えやすさ強化（線が薄い/背景に溶ける対策） */
  z-index: 2 !important;
  filter: drop-shadow(0 1px 0 rgba(15,23,42,.35)) !important;
}

@keyframes additionHissanDrawLine {
  from { 
    width: 0; 
    opacity: 0; 
  }
  to { 
    width: 80%; 
    opacity: 1; 
  }
}

/* ==========================================
   答えの数字
   ========================================== */
.addition-hissan-ans-text {
  background: linear-gradient(135deg, var(--main) 0%, var(--main-light) 50%, var(--accent) 100%) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  background-clip: text !important;
  opacity: 0 !important;
  transform: translateY(15px) scale(0.8) !important;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
}

.addition-hissan-ans-text.addition-hissan-show {
  opacity: 1 !important;
  transform: translateY(0) scale(1) !important;
}

/* ==========================================
   プラス記号
   ========================================== */
.addition-hissan-symbol-plus {
  font-size: clamp(36px, 6vw, 44px) !important;
  font-weight: 900 !important;
  background: linear-gradient(135deg, var(--main), var(--accent)) !important;
  -webkit-background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  background-clip: text !important;
  display: flex !important;
  align-items: center !important;
  justify-content: flex-end !important;
  padding-right: 12px !important;
  width: 100% !important;
  height: 100% !important;
}

/* ==========================================
   レスポンシブ対応
   ========================================== */
@media (max-width: 600px) {
  .addition-hissan-wrap {
    --cell: 70px;
    --gap: 8px;
  }
  
  .addition-hissan-wrap {
    padding: 8px !important;
  }
  
  .addition-hissan-header {
    margin-bottom: 10px !important;
    padding: 10px !important;
  }
  
  .addition-hissan-setup-area,
  .addition-hissan-calc-container {
    padding: 12px !important;
  }
  
  .addition-hissan-guide-box {
    min-height: 70px !important;
    padding: 12px !important;
  }
}

@media (max-width: 450px) {
  .addition-hissan-setup-area {
    flex-wrap: wrap !important;
  }
}

@media (max-width: 400px) {
  .addition-hissan-wrap {
    --cell: 60px;
    --gap: 6px;
  }
}