:root {
  --bg: #f6f5f3;
  --panel: #ffffff;
  --border: #e2e0db;
  --ink: #1c1b19;
  --ink-soft: #6b6862;
  --accent: #d97757;
  --accent-ink: #ffffff;
  --radius: 10px;
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
}

.topbar {
  padding: 28px 32px 18px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--accent);
}

.tagline {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  max-width: 60ch;
}

.layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 20px;
  padding: 24px 32px 40px;
  max-width: 1280px;
  margin: 0 auto;
  align-items: start;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.panel h2 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin: 22px 0 10px;
  font-weight: 600;
}

.panel h2:first-of-type { margin-top: 0; }

.dropzone {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 22px 14px;
  text-align: center;
  cursor: pointer;
  color: var(--ink-soft);
  transition: border-color .15s ease, background .15s ease;
}

.dropzone svg { color: var(--accent); margin-bottom: 6px; }

.dropzone:hover, .dropzone:focus-visible, .dropzone.dragover {
  border-color: var(--accent);
  background: #fbf1ec;
  outline: none;
}

.dropzone p { margin: 4px 0; font-size: 0.9rem; }
.dropzone .hint { font-size: 0.78rem; color: var(--ink-soft); word-break: break-all; }

select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  font-size: 0.9rem;
}

.field {
  display: block;
  margin-bottom: 14px;
}

.field span {
  display: flex;
  justify-content: space-between;
  font-size: 0.83rem;
  color: var(--ink-soft);
  margin-bottom: 5px;
}

.field output { color: var(--ink); font-weight: 600; }

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.87rem;
  color: var(--ink-soft);
  margin: 6px 0 4px;
  cursor: pointer;
}

.checkbox input { accent-color: var(--accent); }

.btnrow {
  margin-top: 18px;
  display: flex;
  gap: 10px;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s ease, transform .05s ease;
}

.btn:active { transform: scale(0.98); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.primary:hover:not(:disabled) { opacity: 0.9; }

.btn.secondary { background: #efece7; color: var(--ink); }
.btn.secondary:hover:not(:disabled) { background: #e5e1da; }

.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

@media (max-width: 640px) {
  .preview-grid { grid-template-columns: 1fr; }
}

.canvas-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 10px;
}

.canvas-wrap.checker {
  background-image:
    linear-gradient(45deg, #eee 25%, transparent 25%),
    linear-gradient(-45deg, #eee 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #eee 75%),
    linear-gradient(-45deg, transparent 75%, #eee 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: #fafafa;
}

.canvas-wrap img, .canvas-wrap svg {
  max-width: 100%;
  max-height: 360px;
  display: block;
}

.placeholder {
  color: var(--ink-soft);
  font-size: 0.85rem;
  text-align: center;
  padding: 20px;
}

.status {
  font-weight: 400;
  text-transform: none;
  letter-spacing: normal;
  font-size: 0.75rem;
}

.status.busy { color: var(--accent); }
.status.done { color: #3a7d44; }
.status.error { color: #c0392b; }

.preview-note {
  margin: 0 0 10px;
  font-size: 0.78rem;
  color: var(--ink-soft);
  font-weight: 400;
}

.output-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.svg-info {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-left: auto;
}

.code-details {
  margin-top: 16px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.code-details summary {
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--ink-soft);
  font-weight: 600;
}

.svg-code {
  margin-top: 10px;
  max-height: 220px;
  overflow: auto;
  background: #1c1b19;
  color: #e8e6e1;
  padding: 14px;
  border-radius: 8px;
  font-size: 0.76rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}

.footer {
  text-align: center;
  padding: 20px;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.footer a { color: var(--accent); }