/* ===== リセット & 基本 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --shirt-color: #4A90D9;
  --beer-color:  #F5A623;
  --bg:          #1a1a2e;
  --surface:     #16213e;
  --surface2:    #0f3460;
  --text:        #e8e8e8;
  --text-sub:    #a0a0b0;
  --error:       #e74c3c;
  --success:     #2ecc71;
  --border:      #2a2a4a;
  --cell-size:   min(14vw, 72px);
}

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ===== アプリ全体 ===== */
#app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px 32px;
}

/* ===== ヘッダー ===== */
header {
  padding: 20px 0 12px;
  text-align: center;
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 8px;
}

.header-inner .streak { justify-self: end; }

.header-right {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ===== 遊び方ボタン ===== */
.btn-howto {
  justify-self: start;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-sub);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.btn-howto:active { opacity: 0.7; }

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  background: linear-gradient(135deg, var(--shirt-color), var(--beer-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.streak {
  font-size: 0.9rem;
  color: var(--beer-color);
  font-weight: 600;
}

.subtitle {
  font-size: 0.8rem;
  color: var(--text-sub);
  margin-top: 4px;
}

/* ===== ゲームエリア ===== */
#game-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding-top: 8px;
}

#puzzle-info {
  display: flex;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-sub);
}

#difficulty {
  background: var(--surface2);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--beer-color);
}

/* ===== 難易度タブ ===== */
#difficulty-tabs {
  display: flex;
  gap: 8px;
  width: 100%;
}

.diff-tab {
  flex: 1;
  padding: 10px 0;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text-sub);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  position: relative;
}

.diff-tab:active { transform: scale(0.96); }

.diff-tab.diff-active {
  background: var(--surface2);
  border-color: var(--shirt-color);
  color: var(--shirt-color);
}

.diff-tab.diff-done::after {
  content: '✓';
  position: absolute;
  top: 3px;
  right: 6px;
  font-size: 0.65rem;
  color: var(--success);
}

/* ===== グリッド ===== */
#grid-container {
  background: var(--surface);
  border-radius: 16px;
  padding: 12px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

#grid {
  display: grid;
  gap: 4px;
  position: relative;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: calc(var(--cell-size) * 0.52);
  border-radius: 8px;
  border: 2px solid var(--border);
  background: var(--surface2);
  cursor: pointer;
  user-select: none;
  transition: transform 0.1s ease, background 0.15s ease, border-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.cell:active:not(.fixed) {
  transform: scale(0.92);
}

.cell.shirt {
  background: rgba(74, 144, 217, 0.15);
  border-color: var(--shirt-color);
}

.cell.beer {
  background: rgba(245, 166, 35, 0.15);
  border-color: var(--beer-color);
}

.cell.fixed {
  cursor: default;
}

.cell.fixed.shirt {
  background: rgba(74, 144, 217, 0.55);
  border-color: var(--shirt-color);
}

.cell.fixed.beer {
  background: rgba(245, 166, 35, 0.55);
  border-color: var(--beer-color);
}

.cell.error {
  border-color: var(--error) !important;
  background: rgba(231, 76, 60, 0.2) !important;
  animation: shake 0.3s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25%       { transform: translateX(-3px); }
  75%       { transform: translateX(3px); }
}

/* ===== 制約マーカー ===== */
.constraint {
  position: absolute;
  transform: translate(-50%, -50%);
  font-size: 0.65rem;
  font-weight: 700;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  pointer-events: none;
}

.constraint.eq {
  background: #2ecc71;
  color: #fff;
  font-size: 0.55rem;
}

.constraint.neq {
  background: #e74c3c;
  color: #fff;
  font-size: 0.7rem;
}

/* ===== 凡例 ===== */
.legend {
  display: flex;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--text-sub);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ===== ルールヒント ===== */
.rules-hint {
  background: var(--surface);
  border-radius: 10px;
  padding: 8px 16px;
  font-size: 0.78rem;
  color: var(--text-sub);
  text-align: center;
  width: 100%;
}

.rules-hint strong {
  color: var(--text);
}

/* ===== タイマー ===== */
.timer-group {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.timer-display {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.best-time-display {
  font-size: 0.68rem;
  color: var(--beer-color);
  font-variant-numeric: tabular-nums;
  opacity: 0.8;
}

/* ===== 結果モーダル: モード・難易度ラベル ===== */
.result-mode-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-sub);
  margin: -4px 0 8px;
}

/* ===== 結果モーダル: ベストタイム ===== */
.result-best {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 12px;
  min-height: 1.2em;
}

.result-best.new-record {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--beer-color);
  animation: newRecord 0.5s ease;
}

@keyframes newRecord {
  0%   { transform: scale(0.8); opacity: 0; }
  60%  { transform: scale(1.1); }
  100% { transform: scale(1);   opacity: 1; }
}

/* ===== コントロール ===== */
#controls {
  display: flex;
  gap: 8px;
  width: 100%;
}

.btn {
  flex: 1;
  padding: 14px 8px;
  border: none;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, opacity 0.15s;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

.btn:active { transform: scale(0.96); }

.btn-primary {
  background: linear-gradient(135deg, var(--shirt-color), #2980b9);
  color: #fff;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-sub);
  border: 1.5px solid var(--border);
}

.btn-hint {
  background: var(--surface);
  color: var(--beer-color);
  border: 1.5px solid var(--beer-color);
}

.btn-undo:disabled {
  opacity: 0.35;
  cursor: default;
}

.btn-undo:active:not(:disabled) { transform: scale(0.96); }

.share-buttons {
  display: none;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  margin-bottom: 8px;
}

.btn-share-x {
  background: #000;
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.btn-share-fb {
  background: #1877f2;
  color: #fff;
  font-weight: 700;
}

.btn-share-copy {
  background: var(--surface2);
  color: var(--text);
  border: 1.5px solid var(--border);
}

/* ===== ヒントパネル ===== */
.hint-panel {
  width: 100%;
  background: var(--surface);
  border: 1.5px solid var(--beer-color);
  border-radius: 14px;
  padding: 14px 16px;
  animation: slideDown 0.25s ease;
}

.hint-panel.hidden { display: none; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hint-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.hint-tech-name {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--beer-color);
  flex: 1;
}

.hint-penalty-badge {
  font-size: 0.7rem;
  background: rgba(245, 166, 35, 0.18);
  color: var(--beer-color);
  padding: 2px 8px;
  border-radius: 8px;
  font-weight: 600;
}

.hint-close {
  background: none;
  border: none;
  color: var(--text-sub);
  font-size: 1rem;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  font-family: inherit;
}

.hint-cell-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.hint-reason-text {
  font-size: 0.78rem;
  color: var(--text-sub);
  line-height: 1.5;
}

/* ===== ヒントハイライトセル ===== */
.cell.hint-target {
  border-color: var(--beer-color) !important;
  box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.35);
  animation: hintPulse 1.2s ease infinite;
}

@keyframes hintPulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.35); }
  50%       { box-shadow: 0 0 0 6px rgba(245, 166, 35, 0.15); }
}

/* ===== モーダル ===== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 100;
  padding: 0 16px 16px;
  backdrop-filter: blur(4px);
}

.modal.hidden { display: none; }

.tentative-panel.hidden { display: none; }

/* フィーチャーフラグでオフにした要素を完全に隠す */
.flag-hidden { display: none !important; }

.modal-content {
  background: var(--surface);
  border-radius: 24px 24px 16px 16px;
  padding: 32px 24px 24px;
  width: 100%;
  max-width: 448px;
  text-align: center;
  box-shadow: 0 -8px 40px rgba(0,0,0,0.5);
  animation: slideUp 0.3s ease;
  max-height: calc(100dvh - 32px);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

@keyframes slideUp {
  from { transform: translateY(60px); opacity: 0; }
  to   { transform: translateY(0);    opacity: 1; }
}

.result-emoji { font-size: 3.5rem; margin-bottom: 8px; }

.modal-content h2 {
  font-size: 1.6rem;
  margin-bottom: 8px;
  background: linear-gradient(135deg, var(--shirt-color), var(--beer-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-content p {
  color: var(--text-sub);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.share-text {
  background: var(--bg);
  border-radius: 10px;
  padding: 12px;
  font-size: 0.85rem;
  white-space: pre-wrap;
  text-align: left;
  margin-bottom: 16px;
  color: var(--text);
  line-height: 1.6;
  font-family: monospace;
}

/* ===== 遊び方モーダル ===== */
.howto-content {
  max-height: 82vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  text-align: left;
  padding: 24px 20px 24px;
}

.howto-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.howto-header h2 {
  font-size: 1.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--shirt-color), var(--beer-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-sub);
  font-size: 1.3rem;
  cursor: pointer;
  padding: 4px 8px;
  font-family: inherit;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}

.howto-section {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}

.howto-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.howto-section h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--shirt-color);
  margin-bottom: 8px;
}

.howto-section p {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-bottom: 8px;
  line-height: 1.5;
}

.howto-section p:last-child { margin-bottom: 0; }

.howto-note {
  background: rgba(245, 166, 35, 0.1);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.82rem !important;
  color: var(--text-sub);
}

.howto-note strong { color: var(--beer-color); }

/* ===== デモセル ===== */
.demo-cell {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  border: 1.5px solid var(--border);
  background: var(--surface2);
  font-size: 1.15rem;
}

.demo-cell.shirt { border-color: var(--shirt-color); background: rgba(74,144,217,0.18); }
.demo-cell.beer  { border-color: var(--beer-color);  background: rgba(245,166,35,0.18); }
.demo-cell.err   { border-color: var(--error); background: rgba(231,76,60,0.2); }

.demo-tap {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
}

.demo-arrow {
  color: var(--text-sub);
  font-size: 0.85rem;
}

.demo-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.demo-row {
  display: flex;
  align-items: center;
  gap: 3px;
}

.demo-dots {
  color: var(--text-sub);
  font-size: 0.9rem;
  margin: 0 2px;
}

.demo-ok { color: var(--success); font-size: 0.82rem; margin-left: 8px; }
.demo-ng { color: var(--error);   font-size: 0.82rem; margin-left: 8px; }

.demo-constraints {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 10px;
}

.demo-con-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

.demo-pair {
  display: flex;
  align-items: center;
  gap: 4px;
}

.demo-badge {
  display: inline-flex;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  font-size: 0.58rem;
  font-weight: 700;
}

.demo-badge.eq  { background: #2ecc71; color: #fff; }
.demo-badge.neq { background: #e74c3c; color: #fff; font-size: 0.75rem; }

.demo-con-desc {
  font-size: 0.85rem;
  color: var(--text-sub);
}

.demo-con-desc strong { color: var(--text); }

/* ===== 実績ボタン (ヘッダー) ===== */
.btn-ach {
  background: transparent;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 2px;
  line-height: 1;
}

/* ===== 実績モーダル ===== */
.ach-modal-content {
  max-height: 80dvh;
  overflow-y: auto;
}

.ach-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.ach-item {
  background: var(--surface2);
  border-radius: 12px;
  padding: 14px 10px;
  text-align: center;
  transition: opacity 0.2s;
}

.ach-item.locked {
  opacity: 0.45;
}

.ach-icon {
  font-size: 1.8rem;
  margin-bottom: 6px;
}

.ach-name {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.ach-desc {
  font-size: 0.7rem;
  color: var(--text-sub);
}

/* ===== 結果モーダル: 新実績 ===== */
.result-achievements {
  margin: 12px 0 4px;
}

.result-ach-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 6px;
}

.result-ach-item {
  font-size: 0.9rem;
  padding: 4px 0;
}

/* ===== モードタブ ===== */
#mode-tabs {
  display: flex;
  gap: 8px;
  width: 100%;
}

.mode-tab {
  flex: 1;
  padding: 8px 0;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text-sub);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.mode-tab.mode-active {
  background: var(--surface2);
  border-color: var(--warn);
  color: var(--warn);
}

.mode-tab.mode-locked {
  display: none;
}

/* ===== 壁マーカー ===== */
.wall-marker {
  position: absolute;
  background: var(--text);
  pointer-events: none;
  z-index: 10;
}

.wall-v {
  width: 4px;
  transform: translateX(-50%);
  border-radius: 2px;
}

.wall-h {
  height: 4px;
  transform: translateY(-50%);
  border-radius: 2px;
}

/* ===== 仮置きモード ===== */
.btn-tentative {
  background: transparent;
  border: 2px solid var(--text-sub);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.btn-tentative.tentative-on,
.btn-tentative:hover {
  border-color: var(--warn);
  color: var(--warn);
  background: #1a1200;
}

.tentative-panel {
  display: flex;
  align-items: center;
  gap: 8px;
  background: #1e1500;
  border: 1px solid var(--warn);
  border-radius: 10px;
  padding: 10px 14px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.tentative-label {
  font-size: 0.82rem;
  color: var(--warn);
  font-weight: 700;
  flex: 1;
}

.btn-tentative-confirm {
  background: #0f2a0f;
  border: 1px solid var(--success);
  color: var(--success);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-tentative-confirm:hover { background: #1a3a1a; }

.btn-tentative-discard {
  background: #2a0f0f;
  border: 1px solid var(--error);
  color: var(--error);
  border-radius: 8px;
  padding: 6px 14px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-tentative-discard:hover { background: #3a1a1a; }

.cell.tentative {
  border-style: dashed;
  border-color: var(--warn) !important;
  opacity: 0.82;
}

/* ===== テーマ切り替え ===== */
.theme-switcher {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 8px 0 4px;
}

.theme-btn {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 5px 12px;
  font-size: 1.1rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  line-height: 1.4;
}

.theme-btn:hover {
  border-color: var(--text-sub);
}

.theme-btn.theme-active {
  border-color: var(--accent);
  background: var(--surface2);
}

/* ===== エリア境界線 ===== */
.region-border {
  position: absolute;
  pointer-events: none;
  z-index: 8;
  border-radius: 2px;
}

.region-border-h {
  height: 3px;
  background: var(--text);
  transform: translateY(-50%);
}

.region-border-v {
  width: 3px;
  background: var(--text);
  transform: translateX(-50%);
}

/* ===== 遊び方: エリア図 ===== */
.demo-region-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 2px;
  margin: 8px auto;
  width: fit-content;
}

.demo-region {
  width: 32px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.demo-region.r0c0 { background: rgba(74,144,217,0.2); color: #4A90D9; }
.demo-region.r0c1 { background: rgba(245,166,35,0.2);  color: #F5A623; }
.demo-region.r1c0 { background: rgba(46,204,113,0.2);  color: #2ecc71; }
.demo-region.r1c1 { background: rgba(155,89,182,0.2);  color: #9b59b6; }
.demo-region.r2c0 { background: rgba(231,76,60,0.2);   color: #e74c3c; }
.demo-region.r2c1 { background: rgba(26,188,156,0.2);  color: #1abc9c; }

/* ===== Xタンゴ: 対角線ハイライト ===== */
.cell.diag-cell {
  box-shadow: inset 0 0 0 2px rgba(180, 100, 255, 0.5);
}

.cell.diag-cell.error {
  box-shadow: none;
}

/* ===== 遊び方: Xタンゴ図 ===== */
.demo-x-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 2px;
  margin: 8px auto;
  width: fit-content;
}

.demo-x-cell {
  width: 32px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface2);
  color: var(--text-sub);
}

/* ===== キラータンゴ ===== */
.cage-svg-overlay {
  position: absolute;
  left: 0; top: 0;
  pointer-events: none;
  z-index: 15;
  overflow: visible;
}

.cage-label {
  position: absolute;
  font-size: 0.6rem;
  font-weight: 800;
  color: #c084fc;
  z-index: 20;
  pointer-events: none;
  line-height: 1;
  background: rgba(15, 20, 46, 0.85);
  padding: 1px 3px;
  border-radius: 3px;
}

/* ===== 遊び方: キラーデモ ===== */
.demo-killer-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0;
  padding: 10px 12px;
  border: 2px dashed #c084fc;
  border-radius: 10px;
  width: fit-content;
  position: relative;
}

.demo-killer-label {
  position: absolute;
  top: -8px; left: 6px;
  font-size: 0.7rem;
  font-weight: 800;
  color: #c084fc;
  background: var(--surface);
  padding: 0 4px;
}

.demo-killer-cells {
  display: flex;
  gap: 4px;
}

.demo-x-cell.diag-demo {
  box-shadow: inset 0 0 0 2px rgba(180, 100, 255, 0.6);
  color: rgba(180, 100, 255, 0.9);
  background: rgba(180, 100, 255, 0.08);
}