:root {
  --bg: #0f1014;
  --panel: #181c24;
  --panel-2: #1f2530;
  --border: #2a3140;
  --fg: #e6ecf2;
  --muted: #8b95a3;
  --accent: #7cc4ff;
  --accent-dim: #4a7aa8;
  --warn: #ffce67;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  min-height: 100vh;
  font-size: 14px;
  line-height: 1.5;
}

code {
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  background: var(--panel);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 0.88em;
}

header {
  max-width: 980px;
  margin: 28px auto 16px;
  padding: 0 20px;
}

h1 {
  margin: 0 0 6px;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 72ch;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.preview-panel {
  grid-column: 1 / 2;
}

.preview-stage {
  background:
    linear-gradient(45deg, #1a1d24 25%, transparent 25%),
    linear-gradient(-45deg, #1a1d24 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1a1d24 75%),
    linear-gradient(-45deg, transparent 75%, #1a1d24 75%);
  background-size: 14px 14px;
  background-position: 0 0, 0 7px, 7px -7px, -7px 0;
  background-color: #14171d;
  border-radius: 6px;
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
}

.preview {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, #7cc4ff, #c084fc);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(124, 196, 255, 0.3);
}

.preview-controls {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.replay {
  background: var(--panel-2);
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
}

.replay:hover { border-color: var(--accent); }

.presets {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.presets .label {
  font-size: 0.78rem;
  color: var(--muted);
}

.preset {
  background: var(--panel-2);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 10px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
}

.preset:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.config-panel { grid-column: 2 / 3; }

.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field .label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.field input, .field select {
  background: #0c0e13;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 8px;
  font-family: inherit;
  font-size: 0.88rem;
  outline: none;
}

.field input:focus, .field select:focus { border-color: var(--accent); }

.frames-panel {
  grid-column: 1 / -1;
}

.frames {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.frame-row {
  display: grid;
  grid-template-columns: 80px 1fr 32px;
  gap: 12px;
  align-items: center;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
}

.stop-label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.stop-input {
  background: #0c0e13;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 6px;
  font-family: inherit;
  font-size: 0.88rem;
  width: 48px;
  outline: none;
}

.props-cell {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.prop-input {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.prop-label {
  font-size: 0.7rem;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  color: var(--muted);
}

.prop-input input {
  background: #0c0e13;
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.82rem;
  outline: none;
}

.prop-input input:focus { border-color: var(--accent); }

.del {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
}

.del:hover { color: #ff6b8a; border-color: #ff6b8a; }

.action {
  margin-top: 10px;
  background: var(--panel-2);
  color: var(--accent);
  border: 1px dashed var(--accent-dim);
  border-radius: 4px;
  padding: 6px 14px;
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
}

.action:hover { border-style: solid; }

.output-panel { grid-column: 1 / -1; }

.output {
  background: #0c0e13;
  color: #c6d4e6;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.84rem;
  line-height: 1.55;
  white-space: pre;
  overflow-x: auto;
  margin: 0;
  min-height: 100px;
}

.copy {
  margin-top: 10px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 0.82rem;
  cursor: pointer;
  font-family: inherit;
}

.copy:hover { border-color: var(--accent); }

footer {
  grid-column: 1 / -1;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.82rem;
  text-align: center;
  line-height: 1.6;
}

footer code {
  background: var(--panel-2);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: "JetBrains Mono", "SF Mono", Consolas, monospace;
  font-size: 0.8rem;
}

@media (max-width: 720px) {
  main { grid-template-columns: 1fr; }
  .preview-panel, .config-panel { grid-column: 1 / -1; }
  .frame-row { grid-template-columns: 80px 1fr; }
  .frame-row .del { grid-column: 2; justify-self: end; }
  .props-cell { grid-template-columns: 1fr; }
}