:root {
  --ink: #0b1220;
  --well: #111a2c;
  --slate: #1a2740;
  --line: #2a3b58;
  --mist: #8ea0bd;
  --paper: #e8edf5;
  --nafl: #d6f56a;
  --nafl-dim: #8aa63a;
  --tear: #3db8a8;
  --stain: #e07a3d;
  --ticket: #f4efe4;
  --ticket-ink: #1a1f2c;
  --locked: #5b6b86;
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "IBM Plex Sans", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  min-height: 100vh;
}

a { color: var(--nafl); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 2px solid var(--nafl);
  outline-offset: 2px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 18, 32, 0.92);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--serif);
}
.brand b { letter-spacing: 0.04em; }
.brand span { color: var(--mist); font-size: 13px; font-family: var(--sans); }
.nav { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 13px; }
.nav a { color: var(--mist); }
.nav a[aria-current="page"] { color: var(--nafl); text-decoration: none; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 28px 20px 80px; }

.kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--nafl-dim);
  margin: 0 0 8px;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: 0.01em; }
h1 { font-size: clamp(28px, 4vw, 40px); line-height: 1.25; margin: 0 0 12px; }
h2 { font-size: 22px; margin: 0 0 10px; }
.lede { color: var(--mist); max-width: 46em; }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 860px) {
  .grid-2 { grid-template-columns: 1fr; }
  .topbar { flex-direction: column; align-items: flex-start; }
}

.card {
  background: var(--well);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 18px;
}
.card.paper {
  background: var(--ticket);
  color: var(--ticket-ink);
}
.card.paper .mist { color: #5b5648; }

label {
  display: block;
  font-size: 12px;
  color: var(--mist);
  margin-bottom: 4px;
}
.field { margin-bottom: 12px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
input, select, textarea, button {
  font: inherit;
}
input, select, textarea {
  width: 100%;
  background: var(--slate);
  color: var(--paper);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 8px 10px;
}
.card.paper input, .card.paper select, .card.paper textarea {
  background: #fff;
  color: var(--ticket-ink);
  border-color: #d5cebf;
}
.hint { font-size: 12px; color: var(--mist); margin-top: 4px; }

button, .btn {
  appearance: none;
  border: 1px solid var(--nafl);
  background: var(--nafl);
  color: var(--ink);
  font-weight: 600;
  padding: 9px 14px;
  border-radius: 3px;
  cursor: pointer;
  display: inline-block;
}
button.ghost, .btn.ghost {
  background: transparent;
  color: var(--nafl);
}
button:disabled { opacity: 0.45; cursor: not-allowed; }

.screws {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 16px 0;
}
@media (max-width: 700px) { .screws { grid-template-columns: 1fr; } }

.screw {
  border: 1px solid var(--nafl-dim);
  background: #162033;
  padding: 14px 14px 12px;
  position: relative;
  min-height: 132px;
}
.screw::before {
  content: "";
  position: absolute;
  top: 10px;
  right: 10px;
  width: 18px;
  height: 18px;
  border: 2px solid var(--nafl);
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px var(--ink), 0 0 0 1px var(--nafl-dim);
}
.screw .name { font-family: var(--mono); font-size: 12px; color: var(--nafl); letter-spacing: 0.08em; }
.screw .val {
  font-family: var(--mono);
  font-size: 28px;
  line-height: 1.15;
  margin: 8px 0 4px;
}
.screw .sub { font-size: 12px; color: var(--mist); }
.screw.locked { border-color: var(--line); opacity: 0.72; }
.screw.locked::before { border-color: var(--locked); }

.bullseye {
  width: 220px;
  height: 220px;
  margin: 8px auto;
}
.warn {
  border: 1px solid var(--stain);
  color: #ffd2b3;
  background: rgba(224, 122, 61, 0.08);
  padding: 10px 12px;
  font-size: 13px;
  margin-top: 10px;
}
.fine {
  font-size: 12px;
  color: var(--mist);
  border-top: 1px solid var(--line);
  margin-top: 22px;
  padding-top: 12px;
}

table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--mist); font-weight: 500; }
td.mono, .mono { font-family: var(--mono); }
.dim { color: var(--locked); }
details { margin-top: 16px; }
details summary { cursor: pointer; color: var(--mist); }

.tools {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 28px;
}
@media (max-width: 700px) { .tools { grid-template-columns: 1fr; } }
.tool-link {
  display: block;
  border: 1px solid var(--line);
  padding: 18px;
  color: inherit;
  text-decoration: none;
  background: var(--well);
}
.tool-link:hover { border-color: var(--nafl-dim); text-decoration: none; }
.tool-link h2 { font-size: 20px; margin: 0 0 6px; }
.tool-link p { margin: 0; color: var(--mist); font-size: 14px; }
.tool-link .idx { font-family: var(--mono); color: var(--nafl); font-size: 12px; }

.module { display: none; }
.module.active { display: block; }
.progress {
  display: flex;
  gap: 4px;
  margin: 16px 0 22px;
  flex-wrap: wrap;
}
.progress button {
  background: var(--slate);
  border-color: var(--line);
  color: var(--mist);
  font-size: 12px;
  padding: 5px 8px;
  font-weight: 500;
}
.progress button.on { background: var(--nafl); color: var(--ink); border-color: var(--nafl); }
.progress button.done { color: var(--nafl); }

.q { border: 1px solid var(--line); padding: 12px; margin: 10px 0; background: var(--slate); }
.q label { color: var(--paper); font-size: 14px; margin: 6px 0; cursor: pointer; }
.ok { color: var(--nafl); }
.bad { color: #ffb089; }

.case-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 700px) { .case-grid { grid-template-columns: 1fr; } }
.case-card {
  border: 1px solid var(--line);
  background: var(--slate);
  padding: 12px;
}
.case-card h3 { margin: 0 0 6px; font-size: 16px; }
.case-card .tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--nafl);
  letter-spacing: 0.06em;
}
.topo {
  width: 100%;
  max-width: 220px;
  height: auto;
  display: block;
  margin: 8px auto;
  background: #0a1020;
}
.choices { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.choices button { font-size: 13px; padding: 6px 10px; font-weight: 500; }
.choices button.ghost { color: var(--paper); border-color: var(--line); }
.choices button.pick-ok { background: var(--nafl); color: var(--ink); border-color: var(--nafl); }
.choices button.pick-bad { background: transparent; color: #ffb089; border-color: var(--stain); }

.cert-sheet {
  background: var(--ticket);
  color: var(--ticket-ink);
  padding: 36px 32px;
  border: 8px double #1a1f2c;
}
.cert-sheet h1 { font-size: 28px; }

@media print {
  .topbar, .no-print { display: none !important; }
  body { background: #fff; color: #111; }
  .wrap { max-width: none; padding: 0; }
}