:root {
  color-scheme: light dark;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --panel-2: #eef3f9;
  --text: #0f172a;
  --muted: #516173;
  --line: #d3dde9;
  --brand: #2563eb;
  --brand-2: #0ea5e9;
  --ok: #047857;
  --error: #dc2626;
  --shadow: 0 18px 55px rgba(15, 23, 42, 0.1);
}

[data-theme="dark"] {
  --bg: #090d14;
  --panel: #111827;
  --panel-2: #172033;
  --text: #f8fafc;
  --muted: #a8b3c4;
  --line: #2d3a50;
  --brand: #60a5fa;
  --brand-2: #22d3ee;
  --ok: #34d399;
  --error: #f87171;
  --shadow: 0 18px 55px rgba(0, 0, 0, 0.3);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}
a { color: var(--brand); }
.container { width: min(1240px, calc(100% - 40px)); margin: 0 auto; }
.site-header, .site-footer { background: var(--panel); border-bottom: 1px solid var(--line); }
.site-footer { border-top: 1px solid var(--line); border-bottom: 0; margin-top: 48px; }
.nav, .footer-inner { min-height: 72px; display: flex; align-items: center; gap: 24px; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; font-weight: 800; }
.brand img { width: 36px; height: 36px; }
.links { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.links a, .links button { color: var(--muted); background: transparent; border: 0; font: inherit; cursor: pointer; text-decoration: none; }
.links a:hover, .links button:hover { color: var(--text); }
.hero { padding: 44px 0 18px; }
.hero h1 { margin: 0; font-size: clamp(2.2rem, 5vw, 4.8rem); line-height: 1; letter-spacing: 0; max-width: 930px; }
.hero p { color: var(--muted); max-width: 740px; font-size: 1.12rem; }
.workbench { display: grid; gap: 18px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); overflow: clip; }
.controls { padding: 16px; display: grid; grid-template-columns: minmax(280px, 1.2fr) minmax(260px, 1fr) minmax(300px, 1fr); gap: 14px; align-items: stretch; }
.dropzone {
  border: 1px dashed color-mix(in srgb, var(--brand), var(--line) 35%);
  border-radius: 9px;
  min-height: 120px;
  padding: 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  background: linear-gradient(135deg, color-mix(in srgb, var(--brand), transparent 90%), transparent);
}
.dropzone.drag { border-color: var(--brand); background: color-mix(in srgb, var(--brand), transparent 88%); }
body.file-dragging .dropzone { border-color: var(--brand); background: color-mix(in srgb, var(--brand), transparent 86%); }
.dropzone input { position: absolute; opacity: 0; pointer-events: none; }
.upload-icon { width: 50px; height: 50px; border-radius: 9px; display: grid; place-items: center; background: var(--brand); color: #fff; font-weight: 800; }
.dropzone strong, .meta strong { display: block; }
.dropzone span, .meta span, .hint { color: var(--muted); font-size: .93rem; }
.meta { border: 1px solid var(--line); border-radius: 9px; padding: 16px; display: grid; gap: 5px; min-height: 120px; }
.status { border-radius: 9px; padding: 16px; background: var(--panel-2); color: var(--muted); min-height: 120px; display: flex; align-items: center; }
.status.ok { color: var(--ok); }
.status.error { color: var(--error); }
.export-row { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; padding: 0 16px 16px; }
.export-card { border: 1px solid var(--line); border-radius: 9px; padding: 14px; display: grid; gap: 10px; background: color-mix(in srgb, var(--panel), var(--panel-2) 35%); }
.export-card h3 { margin: 0; font-size: 1rem; }
.export-card p { margin: 0; color: var(--muted); font-size: .92rem; }
button, select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--text);
  background: var(--panel);
  font: inherit;
}
button.primary { border-color: var(--brand); background: var(--brand); color: #fff; font-weight: 700; }
button:disabled { opacity: .48; cursor: not-allowed; }
.toolbar { padding: 10px 12px; display: flex; align-items: center; justify-content: space-between; gap: 12px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tabs button.active { color: #fff; background: var(--brand); border-color: var(--brand); }
.inline-control { display: flex; align-items: center; gap: 10px; color: var(--muted); }
body:not([data-preview="cube"]) .inline-control { display: none; }
.viewport { min-height: 520px; background: var(--panel-2); padding: 18px; }
.preview-frame { position: relative; }
.canvas-fill { width: 100%; height: auto; aspect-ratio: 5 / 3; display: block; border: 1px solid var(--line); border-radius: 8px; background: #000; }
.corner-caption {
  position: absolute;
  z-index: 2;
  top: 12px;
  left: 12px;
  border-radius: 7px;
  padding: 6px 10px;
  color: #fff;
  background: rgba(15, 23, 42, .72);
  font-weight: 800;
  pointer-events: none;
}
#curvesCanvas { background: var(--panel); }
#cubeCanvas { background: var(--panel-2); cursor: grab; }
.notes { padding: 28px 0; color: var(--muted); }
.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-top: 30px; }
.content-grid h2, .faq h2 { color: var(--text); }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; background: var(--panel); border: 1px solid var(--line); }
th, td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; }
th { color: var(--text); }
.feedback { margin-top: 26px; }
.feedback form { display: grid; gap: 12px; max-width: 720px; }
input, textarea { width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 11px 12px; background: var(--panel); color: var(--text); font: inherit; }
textarea { min-height: 130px; resize: vertical; }
.hp { position: absolute; left: -9999px; }
.resource-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin: 22px 0; }
.resource-card { border: 1px solid var(--line); border-radius: 9px; padding: 16px; background: var(--panel); display: grid; gap: 8px; }
.resource-card h2, .resource-card h3 { margin: 0; color: var(--text); font-size: 1.04rem; }
.resource-card p { margin: 0; }
.tag-list { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-list span { border: 1px solid var(--line); border-radius: 999px; padding: 3px 8px; color: var(--muted); font-size: .82rem; }
.resource-table td, .resource-table th { vertical-align: top; }
.resource-table td:nth-child(1) { min-width: 160px; }
.resource-table td:nth-child(4) { min-width: 220px; }

@media (max-width: 900px) {
  .controls, .export-row, .content-grid, .resource-grid { grid-template-columns: 1fr; }
  .container { width: min(100% - 24px, 1240px); }
  .nav, .footer-inner { align-items: flex-start; flex-direction: column; justify-content: center; padding: 14px 0; }
  .viewport { min-height: 420px; padding: 10px; }
}