:root {
  --bg: #0e1216;
  --panel: #161c22;
  --line: #2a343e;
  --text: #e7eef5;
  --muted: #8b9aab;
  --accent: #c45c26;
  --accent-2: #3d8bfd;
  --field: #0f1419;
  --radius: 12px;
  --font: "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "Consolas", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(900px 480px at 80% -10%, #1a2838 0%, transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: rgba(14, 18, 22, 0.9);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.brand .mark {
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(145deg, var(--accent), #8a3a14);
  font-weight: 700;
  font-size: 0.85rem;
}

.brand strong {
  display: block;
  font-size: 1rem;
}

.brand p {
  margin: 0.1rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.steps {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.steps span {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.steps .on {
  border-color: rgba(196, 92, 38, 0.55);
  color: #f0d2c0;
  background: rgba(196, 92, 38, 0.12);
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 340px) 1fr;
  min-height: calc(100vh - 7rem);
}

.panel {
  padding: 1.25rem;
  border-right: 1px solid var(--line);
  background: var(--panel);
}

.panel h2 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
}

.hint {
  margin: 0 0 1.1rem;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.hint.small {
  margin-top: 0.75rem;
  font-size: 0.78rem;
}

.field {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

.field span {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 500;
}

.field input,
.ai-row input {
  width: 100%;
  min-height: 2.5rem;
  padding: 0 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--field);
  color: var(--text);
  font: inherit;
}

.field input:focus,
.ai-row input:focus {
  outline: 2px solid rgba(61, 139, 253, 0.35);
  border-color: #3d8bfd;
}

.ai-box {
  margin: 1.25rem 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #12181f;
}

.ai-box label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
}

.ai-row {
  display: flex;
  gap: 0.5rem;
}

.ai-hint {
  min-height: 1.2rem;
  margin: 0.45rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.exports {
  display: grid;
  gap: 0.5rem;
}

.exports h3 {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: #1b242e;
  color: var(--text);
  border-radius: 8px;
  min-height: 2.5rem;
  padding: 0 0.9rem;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn:hover {
  border-color: #4a5a6c;
}

.btn.primary {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
}

.btn.primary:hover {
  filter: brightness(1.05);
}

.viewport-wrap {
  position: relative;
  min-height: 520px;
  background: linear-gradient(180deg, #141a21 0%, #0c1014 100%);
}

#viewport {
  width: 100%;
  height: 100%;
  min-height: 520px;
}

#viewport canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.boot-error {
  position: absolute;
  inset: 1rem;
  z-index: 5;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid #7a3030;
  background: rgba(40, 12, 12, 0.92);
  color: #f5d0d0;
  font-size: 0.9rem;
  line-height: 1.5;
  white-space: pre-wrap;
}

.dims {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  padding: 0.45rem 0.7rem;
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.45);
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.foot {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .panel {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  #viewport {
    min-height: 420px;
  }
}