.page {
  flex: 1;
  max-width: 600px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tool {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* アップロードゾーン */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  cursor: pointer;
  transition: border-color 140ms ease, background 140ms ease;
  position: relative;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* 未アップロード時ガイダンス */
.upload-idle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 48px 24px;
  user-select: none;
  pointer-events: none;
}

.upload-icon {
  color: var(--muted);
}

.upload-primary {
  font-size: 14px;
  font-weight: 600;
  color: var(--sub);
}

.upload-sub {
  font-size: 12px;
  color: var(--muted);
}

/* Canvas ラップ */
.canvas-wrap {
  position: relative;
  line-height: 0;
}

#imgCanvas {
  display: block;
  width: 100%;
  height: auto;
  cursor: crosshair;
  border-radius: calc(var(--radius) - 2px);
}

/* ホバー追従スウォッチ */
.cursor-swatch {
  position: fixed;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2.5px solid #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
  pointer-events: none;
  display: none;
  z-index: 100;
  transform: translate(12px, -12px);
}

/* 画像操作バー */
.img-actions {
  display: none;
  justify-content: flex-end;
  margin-top: 2px;
}

.clear-btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: "Noto Sans JP", sans-serif;
  font-size: 12px;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 140ms ease, color 140ms ease;
}

.clear-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* 結果エリア */
.result-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.picked-swatch {
  width: 100%;
  height: 80px;
  border-radius: var(--radius);
  border: 1px solid rgba(0, 0, 0, 0.08);
  background: var(--border);
  transition: background 80ms ease;
}

/* カラー行 */
.color-rows {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.color-row {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  align-items: center;
  gap: 10px;
}

.color-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
  user-select: none;
}

.color-input {
  appearance: none;
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  font-family: "JetBrains Mono", monospace;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink);
  width: 100%;
}

/* コピーボタン */
.copy-btn {
  appearance: none;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--sub);
  font-family: "Noto Sans JP", sans-serif;
  font-size: 12px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  transition: background 140ms ease, color 140ms ease, border-color 140ms ease;
}

.copy-btn:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-deep);
}

.copy-btn.copied {
  background: var(--ok);
  border-color: var(--ok);
  color: #fff;
}

/* アコーディオン */
.section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  cursor: pointer;
  user-select: none;
  gap: 8px;
}

.section-head:hover { background: var(--hover); }

.section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.section-arrow {
  color: var(--muted);
  transition: transform 200ms ease;
  flex-shrink: 0;
}

.section.open .section-arrow { transform: rotate(180deg); }

.section-body {
  display: none;
  padding: 0 18px 16px;
  border-top: 1px solid var(--border);
}

.section.open .section-body { display: block; }

.howto {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: howto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 14px;
}

.howto li {
  counter-increment: howto;
  display: flex;
  gap: 10px;
  font-size: 13px;
  color: var(--sub);
  line-height: 1.6;
}

.howto li::before {
  content: counter(howto);
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}

.about-text {
  font-size: 13px;
  color: var(--sub);
  line-height: 1.7;
  margin: 0;
  padding-top: 14px;
}

.about-text + .about-text { padding-top: 10px; }

.ad-slot { margin-top: 4px; }

/* モバイル */

@media (max-width: 480px) {
  .upload-idle { padding: 32px 16px; }
  .upload-primary { font-size: 13px; }
  .color-label { font-size: 10px; letter-spacing: 0.08em; }
  .color-input { font-size: 12.5px; padding: 9px 10px; }
  .copy-btn    { padding: 8px 10px; font-size: 11px; }
}