:root {
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #1f2937;
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-2: #f59e0b;
  --border: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.muted { color: var(--muted); font-size: 0.9em; }

/* ---------- Landing ---------- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 32px;
  border-bottom: 1px solid var(--border);
  gap: 24px;
  flex-wrap: wrap;
}

.site-title strong { font-size: 1.25rem; margin-right: 12px; }

.github-link {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--text);
  font-size: 0.9rem;
}
.github-link:hover { background: var(--panel); text-decoration: none; border-color: var(--accent); }

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 20px;
  padding: 28px 32px;
}

.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  color: var(--text);
  transition: transform .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }

.card-thumb {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: #e6f0fa center/cover no-repeat;
}

.card-body { padding: 18px 20px 22px; }
.card-body h2 { margin: 0 0 8px; font-size: 1.2rem; }
.card-body p { margin: 0 0 14px; color: var(--muted); line-height: 1.45; }

.badge {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-footer {
  padding: 28px 32px 48px;
  color: var(--muted);
  max-width: 920px;
  font-size: 0.92rem;
  line-height: 1.55;
}

/* ---------- Viewer page ---------- */
.viewer-page { display: flex; flex-direction: column; min-height: 100vh; }

.viewer-header {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.viewer-header h1 { margin: 0; font-size: 1.05rem; font-weight: 500; flex: 1; min-width: 0; }
.viewer-header .back { font-size: 0.95rem; }
.header-actions { display: flex; gap: 8px; }

button {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 7px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
}
button:hover { border-color: var(--accent); }
button.active { background: var(--accent); color: #0f172a; border-color: var(--accent); }

.viewer-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  flex: 1;
  min-height: 0;
}

#canvas-host {
  position: relative;
  background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
}

#render { width: 100%; height: 100%; display: block; }

.status {
  position: absolute;
  bottom: 12px;
  left: 16px;
  color: var(--muted);
  font-size: 0.8rem;
  background: rgba(15, 23, 42, 0.7);
  padding: 4px 10px;
  border-radius: 4px;
  pointer-events: none;
}

.controls {
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 20px;
  overflow-y: auto;
  font-size: 0.9rem;
}
.controls h2 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 0 0 12px;
}
.controls h2:not(:first-child) { margin-top: 24px; }

.param { margin-bottom: 14px; }
.param label {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.85rem;
  margin-bottom: 6px;
}
.param label .name { color: var(--text); font-weight: 500; }
.param label .value { color: var(--accent); font-variant-numeric: tabular-nums; }

.param input[type=range] {
  width: 100%;
}

.param input[type=checkbox] {
  margin-right: 6px;
}

.param-desc { color: var(--muted); font-size: 0.78rem; margin-top: 4px; }

@media (max-width: 880px) {
  .viewer-layout { grid-template-columns: 1fr; }
  .controls { border-left: 0; border-top: 1px solid var(--border); max-height: 50vh; }
  #canvas-host { min-height: 50vh; }
}