:root {
  --bg: #f4f1ea;
  --panel: #ffffff;
  --ink: #2b2b2b;
  --muted: #6b6b6b;
  --line: #e2ddd2;
  --accent: #1f6f8b;
  --accent-ink: #ffffff;
  --danger: #c0392b;
  --radius: 10px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg); color: var(--ink);
  font-family: "Noto Sans JP", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 15px; line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}
.top { padding: 14px 16px 6px; }
.top h1 { font-size: 20px; margin: 0; }
.top p { margin: 2px 0 0; color: var(--muted); font-size: 13px; }

.layout { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 8px 16px 32px; max-width: 1100px; margin: 0 auto; }
.stage, .panel { min-width: 0; }
body { overflow-x: hidden; }
@media (min-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr) 360px; align-items: start; }
  .stage { position: sticky; top: 8px; }
}
.stage { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; }
#canvasWrap { width: 100%; display: flex; justify-content: center; overflow: hidden; }
#canvasWrap .canvas-container { touch-action: none; }
.hint { font-size: 12px; color: var(--muted); margin: 10px 0 0; }
.hint .dash { color: #e0245e; font-weight: 700; }
.warn { font-size: 13px; color: #9a5b00; background: #fff4df; border: 1px solid #f3d9a4; border-radius: 8px; padding: 8px 10px; margin: 8px 0 0; }
.warn[hidden] { display: none; }

.panel { display: flex; flex-direction: column; gap: 10px; }
.group { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.group h2 { font-size: 14px; margin: 0 0 8px; color: var(--muted); font-weight: 700; letter-spacing: .02em; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; }
.row:last-child { margin-bottom: 0; }
label { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }
label.block { display: flex; margin-bottom: 8px; }
label.block > select, label.block > input[type=range], label.block > textarea { flex: 1; min-width: 0; }
textarea {
  font: inherit; padding: 7px 8px; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink); resize: vertical; line-height: 1.4;
}
select, input[type=number] {
  font: inherit; padding: 7px 8px; border: 1px solid var(--line); border-radius: 8px; background: #fff; color: var(--ink); max-width: 100%;
}
input[type=color] { width: 40px; height: 32px; padding: 0 2px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
input[type=range] { accent-color: var(--accent); }
.btn {
  font: inherit; font-size: 14px; padding: 9px 14px; border-radius: 8px; border: 1px solid var(--line);
  background: #fff; color: var(--ink); cursor: pointer; display: inline-flex; align-items: center; gap: 6px; min-height: 40px; text-decoration: none;
}
.btn:hover { border-color: #c9c2b4; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:disabled { opacity: .6; cursor: default; }
.btn.danger { color: var(--danger); }
.btn.big { width: 100%; justify-content: center; font-size: 16px; min-height: 48px; }
.tg { font: inherit; min-width: 40px; min-height: 40px; padding: 6px 10px; border-radius: 8px; border: 1px solid var(--line); background: #fff; cursor: pointer; color: var(--ink); }
.tg.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.small { font-size: 12px; color: var(--muted); margin: 0 0 8px; }
#saveStatus { margin: 8px 0 0; min-height: 1.2em; }
.val { font-variant-numeric: tabular-nums; color: var(--muted); font-size: 13px; min-width: 3.5em; text-align: right; }

.modal { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 50; }
.modal[hidden] { display: none; }
.modal .box { background: #fff; border-radius: 14px; padding: 20px; max-width: 520px; width: 100%; }
.modal h2 { margin: 0 0 8px; font-size: 18px; }
.urlrow { display: flex; gap: 8px; margin: 10px 0; }
.urlrow input { flex: 1; min-width: 0; font: inherit; font-size: 14px; padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; }
.modal img { max-width: 100%; max-height: 200px; display: block; margin: 8px auto; border: 1px solid var(--line); border-radius: 8px; background: repeating-conic-gradient(#eee 0 25%, #fff 0 50%) 0 0/16px 16px; }

/* 閲覧ページ */
.view { max-width: 720px; margin: 0 auto; padding: 8px 16px 40px; display: flex; flex-direction: column; gap: 12px; }
.preview { background: repeating-conic-gradient(#e9e9e9 0 25%, #fff 0 50%) 0 0/20px 20px; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; text-align: center; }
.preview img { max-width: 100%; max-height: 60vh; }
.kv { font-size: 14px; margin: 0; }
.kv dt { color: var(--muted); font-size: 12px; margin-top: 6px; }
.kv dd { margin: 0; }
.err { color: var(--danger); }