:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f1f3f9;
  --text: #141a2e;
  --muted: #5b6480;
  --border: #dde1ec;
  --primary: #1f3a8a;
  --primary-hover: #182f73;
  --primary-soft: #e6ebfa;
  --accent: #f59e0b;
  --ok: #157f3b;
  --ok-soft: #e3f5e9;
  --warn: #9a5b00;
  --warn-soft: #fff3dc;
  --bad: #b42318;
  --bad-soft: #fde8e6;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 26, 46, .05), 0 6px 24px rgba(20, 26, 46, .06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1220;
    --surface: #161b2d;
    --surface-2: #1d2338;
    --text: #e8ebf5;
    --muted: #9aa3bf;
    --border: #2a3150;
    --primary: #7c9cff;
    --primary-hover: #95afff;
    --primary-soft: #1f2a4d;
    --ok: #4ade80;
    --ok-soft: #14301f;
    --warn: #fbbf24;
    --warn-soft: #33270d;
    --bad: #f87171;
    --bad-soft: #3a1718;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.2; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 16px; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.center { text-align: center; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.brand-mark { width: 32px; height: 32px; color: #1f3a8a; display: inline-flex; }
.brand-mark svg { width: 100%; height: 100%; }
.nav { display: flex; gap: 4px; }
.nav a { color: var(--muted); text-decoration: none; padding: 6px 10px; border-radius: 8px; font-size: .95rem; }
.nav a:hover { color: var(--text); background: var(--surface-2); }

/* Hero */
.hero { padding: 40px 0 24px; }
.hero h1 { font-size: clamp(1.75rem, 4vw, 2.6rem); margin: 0 0 10px; letter-spacing: -.02em; }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 720px; margin: 0 0 18px; }
.badges { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.badges li {
  background: var(--surface); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px; font-size: .9rem;
}

/* Tool layout */
.tool { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 20px; align-items: start; padding-bottom: 32px; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.panel h2 { font-size: 1.05rem; margin: 4px 0 14px; display: flex; align-items: center; gap: 10px; }
.panel h2:not(:first-child) { margin-top: 26px; }
.step {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--primary-soft); color: var(--primary);
  display: inline-grid; place-items: center; font-size: .85rem; font-weight: 700; flex: none;
}
.result { position: sticky; top: 76px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 12px; }
.field { display: flex; flex-direction: column; gap: 4px; font-size: .85rem; color: var(--muted); font-weight: 500; min-width: 0; }
.field.inline { flex-direction: row; align-items: center; gap: 8px; }
.field input[type=number], .field input[type=text], .field input[type=date], .field select {
  font: inherit; font-size: 1rem; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  padding: 9px 10px; width: 100%; min-width: 0;
}
.field select { cursor: pointer; }
.field input:focus, .field select:focus, .dropzone:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--primary); outline-offset: 1px;
}
.spec-meta { display: flex; align-items: center; gap: 14px; margin-top: 12px; flex-wrap: wrap; font-size: .9rem; }
.spec-meta select { width: auto; padding: 6px 8px; }
.note {
  margin: 14px 0 0; padding: 10px 12px; border-radius: 10px;
  background: var(--warn-soft); color: var(--text); font-size: .9rem;
  border-left: 3px solid var(--accent);
}

/* Dropzone */
.dropzone {
  display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center;
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 28px 16px;
  cursor: pointer; transition: border-color .15s, background .15s; background: var(--surface-2);
}
.dropzone svg { width: 36px; height: 36px; color: var(--primary); }
.dropzone:hover, .dropzone.drag { border-color: var(--primary); background: var(--primary-soft); }
.dropzone .muted { font-size: .875rem; }

/* Editor */
.stage-wrap {
  display: flex; justify-content: center; padding: 18px;
  background:
    repeating-conic-gradient(var(--surface-2) 0 25%, var(--surface) 0 50%) 0 0 / 20px 20px;
  border-radius: var(--radius); border: 1px solid var(--border);
}
.stage { position: relative; line-height: 0; box-shadow: 0 0 0 1px rgba(0,0,0,.25), 0 6px 20px rgba(0,0,0,.18); touch-action: none; cursor: grab; }
.stage.dragging { cursor: grabbing; }
.stage canvas { display: block; }
.face-guide {
  position: absolute; left: 50%; top: 44%; width: 52%; height: 58%;
  transform: translate(-50%, -50%); border: 2px dashed rgba(245, 158, 11, .9);
  border-radius: 50%; pointer-events: none;
}
.thirds {
  position: absolute; inset: 0; pointer-events: none; opacity: .35;
  background:
    linear-gradient(to right, transparent calc(33.33% - .5px), #fff calc(33.33% - .5px), #fff calc(33.33% + .5px), transparent calc(33.33% + .5px), transparent calc(66.66% - .5px), #fff calc(66.66% - .5px), #fff calc(66.66% + .5px), transparent calc(66.66% + .5px)),
    linear-gradient(to bottom, transparent calc(33.33% - .5px), #fff calc(33.33% - .5px), #fff calc(33.33% + .5px), transparent calc(33.33% + .5px), transparent calc(66.66% - .5px), #fff calc(66.66% - .5px), #fff calc(66.66% + .5px), transparent calc(66.66% + .5px));
  mix-blend-mode: difference;
}
.controls { display: grid; gap: 14px; margin-top: 16px; }
.range span { display: flex; justify-content: space-between; }
.range output { color: var(--text); font-variant-numeric: tabular-nums; }
input[type=range] { width: 100%; accent-color: var(--primary); }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.toggles { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.check { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; font-size: .95rem; }
.check input { width: 18px; height: 18px; accent-color: var(--primary); }

/* Buttons */
.btn {
  font: inherit; font-weight: 600; font-size: .95rem; cursor: pointer;
  border-radius: 10px; padding: 9px 14px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
}
.btn.ghost:hover { background: var(--surface-2); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; padding: 13px 16px; font-size: 1.05rem; }
.btn.primary:hover { background: var(--primary-hover); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn.primary { color: #0e1220; } }
.btn.block { display: flex; width: 100%; margin-top: 14px; }

/* Result */
.empty { text-align: center; padding: 10px 0 4px; }
.empty-frame {
  width: 140px; height: 170px; margin: 0 auto 10px; border-radius: 10px;
  border: 2px dashed var(--border); background: var(--surface-2);
}
.preview-wrap {
  display: grid; place-items: center; min-height: 180px; padding: 16px;
  background: repeating-conic-gradient(var(--surface-2) 0 25%, var(--surface) 0 50%) 0 0 / 16px 16px;
  border-radius: 12px; border: 1px solid var(--border);
}
.preview-wrap img { max-width: 100%; max-height: 320px; box-shadow: 0 0 0 1px rgba(0,0,0,.2), 0 4px 14px rgba(0,0,0,.15); background: #fff; }
.status { margin-top: 14px; padding: 10px 12px; border-radius: 10px; font-weight: 600; font-size: .92rem; }
.status.ok { background: var(--ok-soft); color: var(--ok); }
.status.warn { background: var(--warn-soft); color: var(--warn); }
.status.bad { background: var(--bad-soft); color: var(--bad); }
.status.busy { background: var(--surface-2); color: var(--muted); }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 14px 0 0; }
.stats div { background: var(--surface-2); border-radius: 10px; padding: 8px 10px; }
.stats dt { font-size: .78rem; color: var(--muted); }
.stats dd { margin: 2px 0 0; font-weight: 700; font-variant-numeric: tabular-nums; }

/* Sections */
.section { padding: 28px 16px; }
.section h2 { font-size: 1.5rem; margin: 0 0 8px; }
.table-wrap { overflow-x: auto; margin-top: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { background: var(--surface-2); font-size: .82rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
tbody tr:last-child td { border-bottom: 0; }
td.exam { font-weight: 600; white-space: normal; min-width: 160px; }
td .use { font-size: .85rem; padding: 5px 10px; }
.faq details {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 0 16px; margin-top: 10px;
}
.faq summary { cursor: pointer; padding: 14px 0; font-weight: 600; }
.faq details p { margin: 0 0 14px; color: var(--muted); }

.site-footer { border-top: 1px solid var(--border); padding: 20px 0 28px; color: var(--muted); font-size: .88rem; margin-top: 20px; }

@media (max-width: 920px) {
  .tool { grid-template-columns: 1fr; }
  .result { position: static; }
}
@media (max-width: 560px) {
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .nav a { padding: 6px 7px; font-size: .88rem; }
  .panel { padding: 16px; }
  .stage-wrap { padding: 12px; }
}