:root {
  --canvas: #07080a;
  --surface: #0d0d0d;
  --card: #121212;
  --hairline: #242728;
  --ink: #f4f4f6;
  --body: #cdcdcd;
  --mute: #9c9c9d;
  --blue: #57c1ff;
  --red: #ff6161;
  --green: #59d499;
  --yellow: #ffc533;
  --radius: 12px;
  --font: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--canvas);
  color: var(--body);
  font: 15px/1.55 var(--font);
  overflow-x: hidden;
}
h1, h2 { color: var(--ink); margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 15px; font-weight: 600; }
code, .mono { font-family: var(--mono); font-size: 0.86em; color: var(--ink); overflow-wrap: anywhere; }
[hidden] { display: none !important; }
a { color: var(--blue); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 16px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--hairline);
}
.brand { color: var(--ink); font-weight: 650; font-size: 17px; letter-spacing: -0.02em; }
.brand-to { color: var(--mute); font-weight: 400; margin: 0 1px; }
.top-note { color: var(--mute); font-size: 13px; text-align: right; }

.layout {
  flex: 1;
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: clamp(28px, 6vw, 64px) clamp(16px, 4vw, 40px) 48px;
}
.intro { max-width: 680px; margin-bottom: clamp(24px, 4vw, 40px); }
h1 { font-size: clamp(32px, 5.2vw, 52px); line-height: 1.06; font-weight: 650; letter-spacing: -0.03em; text-wrap: balance; }
.lede { font-size: 17px; color: var(--body); margin: 16px 0 0; max-width: 600px; }

.work { display: grid; gap: 20px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 960px) {
  .work { grid-template-columns: minmax(0, 440px) minmax(0, 1fr); gap: 28px; align-items: start; }
  .stage { position: sticky; top: 20px; }
}
.steps { display: flex; flex-direction: column; gap: 14px; min-width: 0; }

.panel {
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 18px;
  display: flex; flex-direction: column; gap: 12px;
  min-width: 0;
}
.extra { border-color: #2d3b45; background: linear-gradient(180deg, #121820, var(--card) 70%); }
.extra-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.price { color: var(--ink); font-weight: 600; font-variant-numeric: tabular-nums; }

.drop {
  display: flex; flex-direction: column; gap: 6px;
  border: 1px dashed #3a3f41;
  border-radius: 10px;
  padding: 22px 18px;
  cursor: pointer;
  background: var(--surface);
  transition: border-color .15s, background-color .15s;
}
.drop:hover, .drop.over { border-color: var(--blue); background: #0b1218; }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.drop:focus-within { outline: 2px solid var(--blue); outline-offset: 2px; }
.drop-title { color: var(--ink); font-weight: 600; }
.drop-sub { color: var(--mute); font-size: 13.5px; }

.row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 40px; padding: 0 16px;
  border-radius: 9px;
  font: 600 14px/1 var(--font);
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color .15s, border-color .15s, opacity .15s;
}
.btn.ghost { background: transparent; color: var(--ink); border-color: #34383a; }
.btn.ghost:hover { background: #1a1c1d; }
.btn.primary { background: #ffffff; color: #000000; }
.btn.primary:hover { background: #e4e4e6; }
.btn.wide { width: 100%; min-height: 46px; font-size: 15px; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.msg { margin: 0; color: var(--body); font-size: 13.5px; min-height: 0; }
.msg:empty { display: none; }
.hint, .fine { margin: 0; color: var(--mute); font-size: 13.5px; }
.fine { font-size: 12.5px; }

.parts { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.part {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 9px;
}
.part-name { display: flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 500; min-width: 0; overflow-wrap: anywhere; }
.part-meta { color: var(--mute); font-size: 12.5px; flex: 1 1 140px; min-width: 0; overflow-wrap: anywhere; }
.attach { display: flex; align-items: center; gap: 8px; color: var(--mute); font-size: 12.5px; flex-basis: 100%; }
.attach select { flex: 1; min-width: 0; }
.missing { border-left: 2px solid var(--yellow); padding: 4px 0 4px 12px; font-size: 13px; color: var(--body); }
.missing p { margin: 0 0 4px; }

.grid2 { display: grid; gap: 12px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 480px) { .grid2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.field { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--mute); min-width: 0; }
.field > span { display: flex; justify-content: space-between; gap: 8px; }
.field output { color: var(--ink); font-variant-numeric: tabular-nums; }
.check { display: flex; align-items: center; gap: 10px; color: var(--body); font-size: 14px; align-self: end; min-height: 40px; }

input[type=text], input[type=number], select {
  width: 100%;
  min-height: 38px;
  padding: 0 10px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid #2f3335;
  border-radius: 8px;
  font: 14px var(--font);
}
input[type=text]::placeholder { color: #7d7d7e; }
input[type=checkbox] { width: 17px; height: 17px; accent-color: var(--blue); flex: none; margin: 0; }
input[type=range] { width: 100%; accent-color: var(--blue); }

.bones summary { cursor: pointer; color: var(--ink); font-size: 14px; display: flex; align-items: center; gap: 10px; padding: 4px 0; }
.bones[open] summary { margin-bottom: 8px; }
.pill { font-size: 12px; padding: 2px 8px; border-radius: 99px; border: 1px solid currentColor; }
.pill.ok { color: var(--green); }
.pill.warn { color: var(--yellow); }
.bone-grid { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); margin-top: 10px; }
.bone.bad select { border-color: var(--red); }

.stage { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.viewer {
  position: relative;
  aspect-ratio: 4 / 5;
  max-height: 78dvh;
  width: 100%;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
}
.viewer canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
.viewer-empty {
  position: absolute; inset: 0; margin: 0;
  display: grid; place-items: center;
  color: var(--mute); font-size: 14px; pointer-events: none;
}

.notes {
  display: grid; gap: 24px;
  margin-top: clamp(40px, 7vw, 80px);
  padding-top: 32px;
  border-top: 1px solid var(--hairline);
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 960px) { .notes { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 48px; } }
.note-main h2 { font-size: 20px; margin-bottom: 10px; }
.note-main p { margin: 0; max-width: 62ch; }
.note-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; font-size: 14px; }
.note-list li { padding-left: 14px; border-left: 1px solid var(--hairline); }
.note-list strong { color: var(--ink); font-weight: 600; }

.foot {
  padding: 20px clamp(16px, 4vw, 40px);
  border-top: 1px solid var(--hairline);
  color: var(--mute); font-size: 13px;
  display: flex; flex-wrap: wrap; gap: 4px 16px;
}
.foot a { color: inherit; }

@media (max-width: 520px) {
  .top { flex-direction: column; align-items: flex-start; gap: 4px; }
  .top-note { text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}