:root {
  --bg: #e8eef3;
  --panel: #ffffff;
  --ink: #1e293b;
  --muted: #64748b;
  --line: #d8e0e8;
  --accent: #b45309;
  --accent-ink: #fff7ed;
  --ok: #0f766e;
  --danger: #b91c1c;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg); color: var(--ink); }
button, input, select { font: inherit; }

.app {
  height: 100%;
  display: grid;
  grid-template-columns: 380px 1fr;
  min-height: 0;
}

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  padding: 20px 18px 28px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.brand h1 {
  margin: 0 0 4px;
  font-size: 20px;
  letter-spacing: 0.02em;
}
.brand p, .hint, .muted { margin: 0; color: var(--muted); font-size: 13px; }

.card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #f8fafc;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 700;
}

.pallet-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 220px;
  overflow: auto;
}

.pallet-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: white;
  cursor: pointer;
  text-align: left;
}
.pallet-item.active {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.pallet-item strong { display: block; font-size: 13px; }
.pallet-item span { color: var(--muted); font-size: 12px; }
.pallet-actions { display: flex; gap: 4px; align-items: start; }
.icon-btn, .btn {
  border: 1px solid var(--line);
  background: white;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}
.icon-btn:hover, .btn:hover { background: #f1f5f9; }
.btn.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: #9a3412;
  width: 100%;
  padding: 10px 12px;
  font-weight: 700;
}
.btn.primary:hover { filter: brightness(1.05); }
.btn.ghost { width: 100%; margin-top: 8px; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.form-grid label, .stack label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}
.form-grid .full { grid-column: 1 / -1; }
input[type="text"], input[type="number"] {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  background: white;
  color: var(--ink);
}
.mode {
  display: flex;
  gap: 8px;
  margin: 8px 0 12px;
}
.mode label {
  flex: 1;
  border: 1px solid var(--line);
  background: white;
  border-radius: 10px;
  padding: 8px;
  cursor: pointer;
  font-size: 12px;
}
.mode input { margin-right: 6px; }

.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.stat {
  background: white;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
}
.stat b { display: block; font-size: 20px; }
.stat span { color: var(--muted); font-size: 12px; }
.error {
  color: var(--danger);
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 10px;
  padding: 10px;
  font-size: 13px;
}
.ok-line { color: var(--ok); font-size: 13px; }

.stage {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
}
.stage-bar, .stage-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.86);
  border-bottom: 1px solid var(--line);
}
.stage-footer { border-bottom: 0; border-top: 1px solid var(--line); }
#viewer {
  min-height: 0;
  position: relative;
}
#viewer canvas { display: block; width: 100%; height: 100%; }

.range {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 980px) {
  .app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  .sidebar { height: auto; max-height: 48vh; }
  .stage { min-height: 52vh; }
}