:root {
  --bg0: #0e1210;
  --bg1: #161c18;
  --bg2: #1e2720;
  --line: #2e3a32;
  --text: #e6efe8;
  --muted: #8fa094;
  --accent: #c4a35a;
  --accent-dim: #8a7340;
  --zone: #3d8fd1;
  --zone-on: #5cb87a;
  --danger: #c45c4a;
  --font-display: "Bebas Neue", "Impact", sans-serif;
  --font-body: "Source Sans 3", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; min-height: 100%;
  background:
    radial-gradient(ellipse 80% 50% at 20% 0%, #1a241c 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 80%, #1c1810 0%, transparent 50%),
    var(--bg0);
  color: var(--text);
  font-family: var(--font-body);
}

body::before {
  content: "";
  position: fixed; inset: 0; pointer-events: none; opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cpath d='M0 60h120M60 0v120' stroke='%23fff' stroke-width='0.5' fill='none'/%3E%3C/svg%3E");
}

.app {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 3rem;
}

header.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: 1.5rem 0 1.25rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.25rem;
  animation: fadeUp 0.6s ease both;
}

header.hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  letter-spacing: 0.06em;
  color: var(--accent);
  line-height: 0.95;
}

header.hero .tag {
  color: var(--muted);
  font-size: 1rem;
  max-width: 42rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: linear-gradient(165deg, var(--bg1), var(--bg2));
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 1rem;
  animation: fadeUp 0.7s ease both;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  letter-spacing: 0.08em;
  font-size: 1.35rem;
  color: var(--accent);
  font-weight: 400;
}

.toolbar {
  display: flex; flex-wrap: wrap; gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg0);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.85rem;
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  border-radius: 2px;
  transition: border-color 0.15s, background 0.15s, transform 0.15s;
}
.btn:hover { border-color: var(--accent-dim); background: #1a221c; }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(180deg, #d4b46a, var(--accent));
  color: #1a1408;
  border-color: var(--accent);
  font-weight: 600;
}
.btn.primary:hover { filter: brightness(1.05); }
.btn.active {
  border-color: var(--zone-on);
  box-shadow: inset 0 0 0 1px var(--zone-on);
}

.viewport-wrap {
  position: relative;
  background: #0a0d0b;
  border: 1px solid var(--line);
  overflow: hidden;
  min-height: 420px;
  height: min(62vh, 620px);
}

#viewer-3d {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}
#viewer-3d canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

/* legacy template host (unused) */
#template-host {
  width: 100%;
  height: 520px;
  display: block;
}
#template-host .zone.selected {
  fill: #5cb87a !important;
  fill-opacity: 0.35 !important;
  stroke: #8fe0a8 !important;
  stroke-width: 0.55 !important;
}
#template-host .zone.filled {
  fill: url(#art-pattern) !important;
  fill-opacity: 1 !important;
}

.field {
  display: grid;
  gap: 0.3rem;
  margin-bottom: 0.75rem;
}
.field label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.field input, .field select, .field textarea {
  width: 100%;
  background: var(--bg0);
  border: 1px solid var(--line);
  color: var(--text);
  padding: 0.5rem 0.6rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  border-radius: 2px;
}
.field textarea { min-height: 72px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent-dim);
}

.zone-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 0.35rem;
  max-height: 180px; overflow: auto;
}
.zone-list li {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.5rem;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--line);
  background: var(--bg0);
  cursor: pointer;
  font-size: 0.85rem;
}
.zone-list li:hover, .zone-list li.selected {
  border-color: var(--zone-on);
}
.zone-list .badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
}

.preview-stack {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
@media (max-width: 640px) {
  .preview-stack { grid-template-columns: 1fr; }
}

.preview-card {
  background: var(--bg0);
  border: 1px solid var(--line);
  padding: 0.5rem;
}
.preview-card h3 {
  margin: 0 0 0.4rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  font-weight: 600;
}
.preview-card canvas, .preview-card #relief-3d {
  width: 100%;
  height: 160px;
  display: block;
  background: #050706;
}

.status {
  margin-top: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  min-height: 1.2em;
}
.status.err { color: var(--danger); }
.status.ok { color: var(--zone-on); }

.hint {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.4;
  margin: 0.5rem 0 0;
}

.row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.spin {
  display: inline-block;
  width: 0.85em; height: 0.85em;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: -0.1em;
  margin-right: 0.35em;
}
@keyframes spin { to { transform: rotate(360deg); } }