:root {
  --paper: #f4efe6;
  --card: #fffdf8;
  --ink: #1c1915;
  --muted: #6f675e;
  --line: #e6dfd4;
  --seal: #b4332a;
  --seal-ink: #fff8f2;
  --warn: #8a3d12;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(ellipse at top left, #fbf7f0 0%, transparent 46%),
    var(--paper);
  font-family: "Segoe UI", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

.top {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px 8px;
}

.brand {
  display: flex;
  gap: 16px;
  align-items: center;
}

.seal {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  flex: 0 0 auto;
  border: 3px solid var(--seal);
  color: var(--seal);
  font-family: "PMingLiU", "Songti TC", "Microsoft JhengHei", serif;
  font-size: 34px;
  line-height: 1;
  transform: rotate(-8deg);
}

h1, h2, p { margin: 0; }

h1 {
  font-family: "PMingLiU", "Songti TC", "Palatino Linotype", serif;
  font-size: 40px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.brand p, .hint {
  color: var(--muted);
  line-height: 1.5;
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 24px 48px;
  display: grid;
  grid-template-columns: minmax(280px, 380px) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.panel, .preview {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
}

label, legend {
  display: block;
  margin: 16px 0 8px;
  font-size: 14px;
  font-weight: 650;
}

textarea, input[type="number"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: inherit;
  font: inherit;
  padding: 12px;
}

textarea { resize: vertical; min-height: 140px; line-height: 1.6; }

fieldset {
  margin: 16px 0 0;
  padding: 0;
  border: 0;
}

fieldset label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 8px 0;
  font-weight: 500;
}

.meta {
  margin-top: 16px;
  font-variant-numeric: tabular-nums;
}

.dot { margin: 0 6px; color: var(--muted); }

.warn {
  margin-top: 10px;
  color: var(--warn);
}

.hint { margin-top: 12px; font-size: 14px; }

button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 650;
  cursor: pointer;
}

button:disabled { cursor: not-allowed; opacity: 0.45; }

#download {
  width: 100%;
  margin-top: 16px;
  background: var(--seal);
  color: var(--seal-ink);
}

.passages { margin-bottom: 4px; }

.group-label {
  margin: 14px 0 8px;
  font-size: 14px;
  font-weight: 650;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset {
  padding: 6px 12px;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  font-weight: 500;
}

.preset.is-active {
  background: var(--seal);
  color: var(--seal-ink);
  border-color: var(--seal);
}

button:focus-visible, textarea:focus-visible, input:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 2px;
}

.preview h2 {
  font-size: 16px;
  letter-spacing: 0.12em;
}

.preview .hint { margin-top: 6px; }

.sheet-frame {
  margin-top: 14px;
  display: grid;
  place-items: center;
  min-height: 420px;
  background:
    linear-gradient(180deg, rgba(28, 25, 21, 0.03), transparent 28%),
    #efe8dc;
  border-radius: 14px;
  padding: 18px;
}

.empty {
  color: var(--muted);
  text-align: center;
}

canvas {
  width: min(100%, 460px);
  height: auto;
  background: white;
  box-shadow: 0 16px 40px rgba(70, 48, 24, 0.14);
}

@media (max-width: 840px) {
  main { grid-template-columns: 1fr; }
  .top, main { padding-left: 16px; padding-right: 16px; }
}