/* GearForge UI — professional dark engineering theme */
:root {
  --bg: #0f1216;
  --bg-grad: radial-gradient(1200px 600px at 70% -10%, #16202c 0%, #0f1216 60%);
  --panel: #161b22;
  --panel-2: #1c232d;
  --panel-3: #232c38;
  --line: #2a3441;
  --line-soft: #222a35;
  --text: #e6ebf2;
  --text-2: #b7c1cf;
  --dim: #7d8895;
  --accent: #58a6ff;
  --accent-soft: rgba(88, 166, 255, 0.12);
  --cut: #ff5c5c;
  --engrave: #4fa3ff;
  --ok: #4ec98f;
  --warn: #e2b93b;
  --err: #ff6b6b;
  --radius: 10px;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 15px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg) var(--bg-grad) no-repeat;
  color: var(--text);
  font-family: var(--font-ui);
  display: flex; flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ------------------------------------------------------------- header */
header {
  display: flex; align-items: center; gap: 14px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(22, 27, 34, 0.85);
  backdrop-filter: blur(6px);
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand svg { width: 28px; height: 28px; color: var(--accent); }
.brand h1 { margin: 0; font-size: 1.12rem; font-weight: 650; letter-spacing: 0.2px; }
.brand h1 span { color: var(--accent); }
header .tagline { margin: 0; color: var(--dim); font-size: 0.8rem; flex: 1; }
header .links { display: flex; gap: 14px; align-items: center; }
header .links a {
  color: var(--dim); font-size: 0.78rem; text-decoration: none;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 10px; border: 1px solid var(--line-soft); border-radius: 999px;
  transition: color 0.15s, border-color 0.15s;
}
header .links a:hover { color: var(--accent); border-color: var(--accent); }
header .links svg { width: 14px; height: 14px; }

main { flex: 1; display: flex; min-height: 0; }

/* ------------------------------------------------------------ sidebar */
#sidebar {
  width: 350px; min-width: 350px; overflow-y: auto;
  background: var(--panel);
  border-right: 1px solid var(--line-soft);
  padding: 14px;
  scrollbar-width: thin; scrollbar-color: var(--line) transparent;
}
#typeTabs { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; margin-bottom: 14px; }
#typeTabs button {
  background: var(--panel-2); color: var(--text-2);
  border: 1px solid var(--line-soft); border-radius: 8px;
  padding: 9px 6px; cursor: pointer;
  font: 500 0.78rem var(--font-ui);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
#typeTabs button:hover { border-color: var(--accent); color: var(--text); }
#typeTabs button.active {
  border-color: var(--accent); color: var(--accent);
  background: var(--accent-soft); font-weight: 600;
}

#presetRow { display: flex; gap: 10px; align-items: center; margin-bottom: 14px; }
#presetRow label { color: var(--dim); font-size: 0.76rem; font-weight: 500; }
#presetRow select { flex: 1; }

fieldset {
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  margin: 0 0 14px; padding: 10px 12px 12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.015), transparent);
}
legend {
  color: var(--accent); font-size: 0.72rem; font-weight: 650;
  text-transform: uppercase; letter-spacing: 0.8px; padding: 0 7px;
}
.row { display: flex; align-items: center; gap: 10px; margin: 7px 0; }
.row label { flex: 1; font-size: 0.82rem; color: var(--text-2); line-height: 1.3; }
.row label small { color: var(--dim); display: block; font-size: 0.67rem; margin-top: 1px; }
.row input[type="number"], .row input[type="text"], select {
  width: 116px; background: var(--bg); color: var(--text);
  border: 1px solid var(--line); border-radius: 7px;
  padding: 6px 9px; font: 0.82rem var(--font-mono);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.row input:focus, select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
select { font-family: var(--font-ui); }
.row input[type="checkbox"] { width: auto; accent-color: var(--accent); }

#warnings { display: flex; flex-direction: column; gap: 7px; }
.warnItem {
  border-left: 3px solid var(--warn);
  background: var(--panel-2);
  padding: 8px 11px; font-size: 0.75rem; line-height: 1.45;
  border-radius: 0 8px 8px 0; color: var(--text-2);
}
.warnItem.error { border-color: var(--err); background: rgba(255, 107, 107, 0.07); color: #ffc9c9; }
.warnItem.info { border-color: var(--engrave); color: var(--dim); }

/* -------------------------------------------------------------- stage */
#stage { flex: 1; display: flex; flex-direction: column; min-width: 0; }
#toolbar {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 14px;
  background: var(--panel); border-bottom: 1px solid var(--line-soft);
}
#toolbar .spacer { flex: 1; }
#toolbar button {
  background: var(--panel-2); color: var(--text-2);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 7px 13px; cursor: pointer;
  font: 500 0.79rem var(--font-ui);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
#toolbar button:hover { border-color: var(--accent); color: var(--text); }
#toolbar button.primary {
  background: var(--accent); border-color: var(--accent); color: #0b1826; font-weight: 650;
}
#toolbar button.primary:hover { background: #74b6ff; color: #0b1826; }
#toolbar label {
  font-size: 0.78rem; color: var(--text-2);
  display: inline-flex; gap: 6px; align-items: center; cursor: pointer;
}
#toolbar input[type="checkbox"] { accent-color: var(--accent); }
#zoomInfo { color: var(--dim); font-size: 0.7rem; font-family: var(--font-mono); }
.hidden { display: none !important; }

#viewport {
  flex: 1; position: relative; min-height: 0;
  background:
    radial-gradient(circle at 50% 45%, rgba(88,166,255,0.05) 0%, transparent 55%),
    var(--bg);
}
#viewport::before { /* fine grid */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 28px 28px;
}
#preview { width: 100%; height: 100%; display: block; cursor: grab; position: relative; }
#preview:active { cursor: grabbing; }
#preview .cutPath { fill: rgba(88, 166, 255, 0.08); stroke: var(--cut); stroke-width: var(--sw, 0.5); }
#preview .cutPath.hole { fill: var(--bg); }
#preview .engravePath {
  fill: none; stroke: var(--engrave); opacity: 0.75;
  stroke-width: var(--sw, 0.5);
  stroke-dasharray: calc(var(--sw, 0.5) * 6) calc(var(--sw, 0.5) * 4);
}
#preview text.engraveText { fill: var(--engrave); opacity: 0.8; font-family: var(--font-mono); }
#preview .mate .cutPath { stroke: var(--ok); fill: rgba(78, 201, 143, 0.06); }

#errBox {
  position: absolute; inset: auto 14px 14px 14px;
  background: rgba(58, 22, 27, 0.95); border: 1px solid var(--err); color: #ffd3d3;
  border-radius: var(--radius); padding: 11px 15px; font-size: 0.83rem;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}

#reportBox {
  border-top: 1px solid var(--line-soft); background: var(--panel);
  max-height: 36%; overflow-y: auto; padding: 4px 16px 12px;
}
#reportBox summary {
  cursor: pointer; color: var(--text-2); font-size: 0.78rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.7px; padding: 8px 0;
  user-select: none;
}
#reportBox summary:hover { color: var(--accent); }
#reportTable { border-collapse: collapse; width: 100%; font-size: 0.79rem; }
#reportTable td { padding: 4px 16px 4px 0; border-bottom: 1px solid var(--line-soft); }
#reportTable td:first-child { color: var(--dim); white-space: nowrap; width: 40%; }
#reportTable td:last-child { color: var(--text); font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
#reportTable tr.section td {
  color: var(--accent); font-weight: 650; font-family: var(--font-ui);
  padding-top: 12px; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.6px;
}

footer {
  padding: 9px 20px; border-top: 1px solid var(--line-soft); background: var(--panel);
}
footer p { margin: 0; color: var(--dim); font-size: 0.68rem; line-height: 1.55; }
footer b { color: var(--text-2); font-weight: 600; }
footer .cutdot, footer .engdot {
  display: inline-block; width: 8px; height: 8px; border-radius: 2px;
  margin: 0 3px -1px 2px;
}
footer .cutdot { background: var(--cut); }
footer .engdot { background: var(--engrave); }

@media (max-width: 900px) {
  main { flex-direction: column; }
  #sidebar { width: 100%; min-width: 0; max-height: 45vh; }
  header .tagline { display: none; }
}