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

:root {
  --color-bg:       #f5f5f5;
  --color-panel:    #ffffff;
  --color-border:   #cccccc;
  --color-primary:  #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-danger:   #dc2626;
  --color-success:  #16a34a;
  --color-text:     #1a1a1a;
  --color-muted:    #6b7280;
  --color-hint-bg:  #e8f0fe;
  --color-hint-border: #93c5fd;
  --color-cell-unknown: #f0f0f0;
  --color-cell-black:   #1a1a1a;
  --color-cell-white:   #ffffff;

  --font:           'Segoe UI', 'Noto Sans JP', sans-serif;
  --radius:         4px;
  --shadow:         0 1px 3px rgba(0,0,0,.12);
  --panel-width:    190px;
}

html, body {
  height: 100%;
  font-family: var(--font);
  font-size: 13px;
  background: var(--color-bg);
  color: var(--color-text);
}

/* ── レイアウト ──────────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ヘッダー */
#header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-primary);
  color: #fff;
  padding: 0 16px;
  height: 44px;
  flex-shrink: 0;
  box-shadow: 0 2px 4px rgba(0,0,0,.2);
}
#header h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .03em;
}
#header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
/* ヘッダーロゴ */
#header-logo-link {
  display: inline-flex;
  align-items: center;
  opacity: .85;
  transition: opacity .2s;
  flex-shrink: 0;
}
#header-logo-link:hover { opacity: 1; }
#header-logo-img {
  height: 18px;
  filter: brightness(1.8) saturate(.8);
}

#lang-select {
  padding: 2px 4px;
  font-size: 11px;
  border: 1px solid rgba(255,255,255,.4);
  border-radius: 3px;
  background: rgba(255,255,255,.15);
  color: #fff;
  cursor: pointer;
  outline: none;
}
#lang-select:hover { background: rgba(255,255,255,.25); }
#lang-select option { color: #333; background: #fff; }
#solve-rate-display {
  font-size: 13px;
  font-weight: 500;
  background: rgba(255,255,255,.2);
  border-radius: 12px;
  padding: 2px 12px;
}

/* メインコンテンツ */
#main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── 左パネル（操作） ────────────────────────────────────── */
#side-panel {
  width: var(--panel-width);
  background: var(--color-panel);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  padding: 8px;
  gap: 6px;
  overflow-y: auto;
  flex-shrink: 0;
}

.panel-section {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.panel-section h3 {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--color-muted);
  letter-spacing: .05em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 2px;
  margin-bottom: 1px;
}

/* ボタン2列グリッド */
.btn-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}
/* サイズ設定横並び */
.size-inline {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: nowrap;
}
.size-inline label {
  font-size: 11px;
  color: var(--color-muted);
  flex-shrink: 0;
}
.size-inline input[type="number"] {
  width: 52px;
  padding: 3px 4px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 12px;
  text-align: right;
}
.size-inline .btn-apply {
  flex: 1;
  padding: 4px 4px;
  font-size: 11px;
}
/* マス色横並び */
.color-compact {
  display: flex;
  align-items: center;
  gap: 6px;
}
.color-compact-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 10px;
  color: var(--color-muted);
  flex: 1;
}
.color-compact-item input[type="color"] {
  width: 100%;
  height: 20px;
  padding: 1px;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  cursor: pointer;
}

/* サイズ入力 */
.size-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.size-row label {
  width: 28px;
  font-size: 12px;
  color: var(--color-muted);
}
.size-row input[type="number"] {
  width: 70px;
  padding: 4px 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 13px;
  text-align: right;
}
.size-row input[type="number"]:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* ボタン共通 */
button {
  width: 100%;
  padding: 7px 10px;
  border: none;
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font);
  transition: background .15s, opacity .15s;
}
button:disabled { opacity: .45; cursor: default; }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
}
.btn-primary:hover:not(:disabled) { background: var(--color-primary-hover); }

.btn-secondary {
  background: #e5e7eb;
  color: var(--color-text);
}
.btn-secondary:hover:not(:disabled) { background: #d1d5db; }

.btn-danger {
  background: #fee2e2;
  color: var(--color-danger);
}
.btn-danger:hover:not(:disabled) { background: #fecaca; }

.btn-success {
  background: #dcfce7;
  color: var(--color-success);
}
.btn-success:hover:not(:disabled) { background: #bbf7d0; }

.btn-file {
  background: #d1fae5;
  color: #065f46;
}
.btn-file:hover:not(:disabled) { background: #a7f3d0; }

.btn-warning {
  background: #fef3c7;
  color: #92400e;
}
.btn-warning:hover:not(:disabled) { background: #fde68a; }

/* ステップ速度設定行 */
.speed-row {
  display: flex;
  align-items: center;
  gap: 4px;
}
.speed-row label {
  font-size: 12px;
  color: var(--color-muted);
  white-space: nowrap;
}
.speed-row input[type="number"] {
  width: 64px;
  padding: 3px 5px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 12px;
  text-align: right;
}
.speed-row span {
  font-size: 12px;
  color: var(--color-muted);
}

/* 色設定行 */
.color-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.color-row label {
  flex: 1;
  font-size: 12px;
  color: var(--color-muted);
}
.color-row input[type="color"] {
  width: 36px;
  height: 22px;
  padding: 0 2px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
}

/* ズームボタン */
.zoom-row {
  display: flex;
  gap: 4px;
}
.zoom-row button {
  flex: 1;
  padding: 5px;
  font-size: 14px;
}

/* ステータス */
#status-message {
  font-size: 11px;
  color: var(--color-muted);
  min-height: 16px;
  line-height: 1.4;
  word-break: break-all;
}
#status-message.error   { color: var(--color-danger); }
#status-message.success { color: var(--color-success); }

/* ── パズルエリア ─────────────────────────────────────────── */
#puzzle-area {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* スクロールコンテナ */
#puzzle-scroll {
  flex: 1;
  overflow: auto;
  padding: 8px;
  background: var(--color-bg);
}

/* 4象限グリッドレイアウト */
#puzzle-layout {
  display: inline-grid;
  grid-template-columns: auto auto;
  grid-template-rows: auto auto;
  gap: 0;
  user-select: none;
}

/* 左上の空きコーナー */
#corner {
  background: transparent;
}

/* グリッドキャンバスのラッパー */
#grid-wrap {
  position: relative;
  line-height: 0; /* canvas の下の余白をなくす */
}
#grid-canvas {
  cursor: pointer;
  display: block;
}

/* ── サンプル選択ボタン ────────────────────────────────── */
.btn-sample {
  background: linear-gradient(135deg, #dbeafe, #ede9fe) !important;
  border: 1px solid var(--color-hint-border) !important;
  color: #1e40af !important;
  font-weight: 600 !important;
}
.btn-sample:hover {
  background: linear-gradient(135deg, #bfdbfe, #ddd6fe) !important;
}

/* ── サンプル選択モーダル ──────────────────────────────── */
#sample-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}
#sample-modal {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 8px 32px rgba(0,0,0,.25);
  width: 420px;
  max-width: 90vw;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
#sample-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid #e5e7eb;
  background: #f9fafb;
}
#sample-modal-header h3 {
  font-size: 14px;
  font-weight: 700;
  color: #1e40af;
}
#sample-modal-close {
  width: auto;
  padding: 4px 10px;
  font-size: 14px;
  background: none;
  border: 1px solid #d1d5db;
  border-radius: 4px;
  color: #6b7280;
  cursor: pointer;
}
#sample-modal-close:hover { background: #f3f4f6; color: #374151; }
#sample-modal-list {
  padding: 12px;
  overflow-y: auto;
  flex: 1;
}
.sample-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s;
  margin-bottom: 8px;
}
.sample-item:last-child { margin-bottom: 0; }
.sample-item:hover {
  background: #eff6ff;
  border-color: var(--color-primary);
  box-shadow: 0 1px 4px rgba(37,99,235,.15);
}
.sample-item-name {
  font-size: 13px;
  font-weight: 600;
  color: #1e3a5f;
}
.sample-item-size {
  font-size: 11px;
  color: #6b7280;
  margin-left: auto;
  white-space: nowrap;
}

/* ── ヒント入力パネル（グリッド上部） ────────────────────── */
#hint-input-panel {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--color-panel);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}
#hint-input-label {
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  min-width: 100px;
}
#hint-input-field {
  flex: 1;
  max-width: 300px;
  padding: 5px 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 13px;
}
#hint-input-field:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(37,99,235,.15);
}
#hint-input-current {
  font-size: 12px;
  color: var(--color-muted);
  white-space: nowrap;
}
.hint-input-help {
  font-size: 11px;
  color: var(--color-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex-shrink: 1;
  min-width: 0;
}
@media (max-width: 900px) {
  .hint-input-help { display: none; }
}

/* ── 行ヒント（グリッド左側） ────────────────────────────── */
#row-hints-area {
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

/* 行ヒント: 1行表示セル（グリッド線付き） */
.rh-cell {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  box-sizing: border-box;
  border-bottom: 1px solid #ddd;
  border-right: 2px solid var(--color-border);
  background: var(--color-hint-bg);
  padding: 0 3px;
  cursor: pointer;
  overflow: hidden;
}
.rh-cell:first-child {
  border-top: 1px solid #ddd;
}
.rh-cell.rh-sep5 {
  border-top: 2px solid #888;
}
.rh-cell:hover {
  background: #dbeafe;
}
.rh-cell.selected {
  background: #bfdbfe;
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  z-index: 1;
}

/* セルサイズが極小のとき数字テキストを非表示 */
.hints-text-hidden .rh-num,
.hints-text-hidden .ch-num {
  font-size: 0 !important;
  color: transparent !important;
}

/* 行ヒント: 数字 */
.rh-num {
  display: inline-block;
  width: 22px;
  text-align: center;
  font-size: 11px;
  color: var(--color-text);
  flex-shrink: 0;
}

/* ── 列ヒント（グリッド上側） ────────────────────────────── */
#col-hints-area {
  display: flex;
  flex-direction: row;
  align-items: stretch;
}

/* 列ヒント: 1列表示セル（グリッド線付き、数字縦積み） */
.ch-cell {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  box-sizing: border-box;
  border-right: 1px solid #ddd;
  border-bottom: 2px solid var(--color-border);
  background: var(--color-hint-bg);
  cursor: pointer;
  overflow: hidden;
  flex-shrink: 0;
}
.ch-cell:first-child {
  border-left: 1px solid #ddd;
}
.ch-cell.ch-sep5 {
  border-left: 2px solid #888;
}
.ch-cell:hover {
  background: #dbeafe;
}
.ch-cell.selected {
  background: #bfdbfe;
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
  z-index: 1;
}

/* 列ヒント: 1つの数字（縦積み） */
.ch-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  font-size: 11px;
  color: var(--color-text);
  box-sizing: border-box;
  flex-shrink: 0;
}

/* ── プログレスバー ──────────────────────────────────────── */
#progress-bar-wrap {
  height: 4px;
  background: #e5e7eb;
  flex-shrink: 0;
}
#progress-bar {
  height: 100%;
  background: var(--color-primary);
  width: 0%;
  transition: width .3s;
}

/* ── ローディングオーバーレイ ────────────────────────────── */
#loading-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,.6);
  z-index: 100;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
}
#loading-overlay.visible {
  display: flex;
}
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid #e5e7eb;
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loading-label {
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 600;
}

/* ── ファイル入力（非表示） ──────────────────────────────── */
#file-input { display: none; }

/* ── スクロールバー（細め） ─────────────────────────────── */
#puzzle-scroll::-webkit-scrollbar { width: 8px; height: 8px; }
#puzzle-scroll::-webkit-scrollbar-track { background: transparent; }
#puzzle-scroll::-webkit-scrollbar-thumb { background: #c1c1c1; border-radius: 4px; }
#puzzle-scroll::-webkit-scrollbar-thumb:hover { background: #a0a0a0; }

/* ── レスポンシブ（小画面） ─────────────────────────────── */
@media (max-width: 600px) {
  :root { --panel-width: 160px; }
  #header h1 { font-size: 13px; }
  .panel-section h3 { font-size: 10px; }
  button { font-size: 12px; padding: 6px 8px; }
}