:root {
  --atlas-bg: #04060f;
  --atlas-bg-soft: #080d1d;
  --atlas-panel: rgba(10, 16, 34, .86);
  --atlas-ink: #eef1fb;
  --atlas-muted: #a3abc6;
  --atlas-dim: #6f7897;
  --atlas-line: rgba(150, 165, 220, .2);
  --atlas-line-soft: rgba(150, 165, 220, .1);
  --atlas-gold: #f6c667;
  --atlas-gold-soft: #ffe3a3;
  --atlas-cyan: #7fd8ff;
  --atlas-rose: #ff9ec2;
  --atlas-violet: #9d8cff;
  --atlas-display: "Shippori Mincho", serif;
  --atlas-body: "Noto Sans JP", sans-serif;
  --atlas-mono: "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.guide-body {
  margin: 0;
  color: var(--atlas-ink);
  background:
    radial-gradient(900px 620px at 80% 0%, rgba(30, 48, 105, .35), transparent 68%),
    radial-gradient(760px 560px at 8% 74%, rgba(45, 24, 73, .22), transparent 72%),
    var(--atlas-bg);
  font-family: var(--atlas-body);
  font-size: 16px;
  line-height: 1.95;
  overflow-x: hidden;
}

body.guide-body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: .38;
  background-image:
    radial-gradient(circle at 11% 18%, rgba(255, 255, 255, .8) 0 1px, transparent 1.5px),
    radial-gradient(circle at 83% 31%, rgba(127, 216, 255, .72) 0 1px, transparent 1.5px),
    radial-gradient(circle at 61% 82%, rgba(246, 198, 103, .72) 0 1px, transparent 1.5px),
    radial-gradient(circle at 32% 62%, rgba(255, 158, 194, .55) 0 1px, transparent 1.5px);
  background-size: 260px 260px, 340px 340px, 420px 420px, 520px 520px;
}

body.guide-body::selection { color: #0a0c16; background: var(--atlas-gold); }
a { color: inherit; }
a:hover { color: var(--atlas-gold-soft); }
:focus-visible { outline: 3px solid var(--atlas-gold); outline-offset: 4px; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 20;
  padding: 9px 14px;
  color: #0a0c16;
  background: var(--atlas-gold);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.guide-header {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 25px 28px 16px;
  border-bottom: 1px solid var(--atlas-line);
}
.guide-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  white-space: nowrap;
}
.guide-brand-mark { width: 30px; height: 30px; flex: none; }
.guide-brand-text { line-height: 1.25; }
.guide-brand-text strong {
  display: block;
  color: var(--atlas-gold);
  font: 500 10px/1.3 var(--atlas-mono);
  letter-spacing: .25em;
}
.guide-brand-text span {
  display: block;
  font: 700 16px/1.5 var(--atlas-display);
  letter-spacing: .18em;
}
.guide-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  font: 500 11px/1.5 var(--atlas-mono);
  letter-spacing: .08em;
}
.guide-nav a {
  padding: 8px 0;
  color: var(--atlas-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.guide-nav a:hover, .guide-nav a[aria-current="page"] { color: var(--atlas-gold-soft); border-color: var(--atlas-gold); }

.guide-shell { max-width: 1240px; margin: 0 auto; padding: 0 28px; }
.guide-main { padding: 54px 0 112px; }
.guide-crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 12px;
  margin-bottom: 42px;
  color: var(--atlas-dim);
  font: 500 11px/1.6 var(--atlas-mono);
  letter-spacing: .06em;
}
.guide-crumbs a { color: var(--atlas-muted); text-decoration: none; }
.guide-crumbs .separator { color: var(--atlas-gold); }

.guide-hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
  gap: clamp(36px, 8vw, 112px);
  align-items: end;
  padding: 18px 0 60px;
}
.guide-hero::after {
  position: absolute;
  right: 6%;
  bottom: 20px;
  width: min(360px, 60vw);
  height: 1px;
  content: "";
  background: linear-gradient(90deg, transparent, var(--atlas-gold), transparent);
  opacity: .65;
}
.guide-kicker {
  margin: 0 0 18px;
  color: var(--atlas-gold);
  font: 500 11px/1.5 var(--atlas-mono);
  letter-spacing: .17em;
  text-transform: uppercase;
}
.guide-kicker::before { display: inline-block; width: 44px; height: 1px; margin: 0 12px 4px 0; content: ""; background: currentColor; }
.guide-hero h1 {
  max-width: 820px;
  margin: 0;
  font: 700 clamp(38px, 6vw, 82px)/1.16 var(--atlas-display);
  letter-spacing: .06em;
  text-wrap: balance;
}
.guide-hero .latin {
  margin: 12px 0 0;
  color: var(--atlas-cyan);
  font: 500 12px/1.5 var(--atlas-mono);
  letter-spacing: .16em;
}
.guide-lead {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--atlas-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 2;
}
.answer-panel, .atlas-panel {
  border: 1px solid var(--atlas-line);
  background: linear-gradient(145deg, rgba(18, 28, 57, .84), rgba(5, 8, 19, .86));
  box-shadow: 0 22px 70px rgba(0, 0, 0, .22);
}
.answer-panel { padding: 24px; }
.answer-panel .panel-label, .atlas-panel .panel-label {
  display: block;
  margin-bottom: 12px;
  color: var(--atlas-gold);
  font: 500 10px/1.5 var(--atlas-mono);
  letter-spacing: .17em;
}
.answer-panel p { margin: 0; color: var(--atlas-ink); font-family: var(--atlas-display); font-size: 20px; line-height: 1.8; }

.guide-section { padding: 62px 0; border-top: 1px solid var(--atlas-line-soft); }
.guide-section:first-of-type { border-top: 0; }
.section-heading { display: flex; align-items: baseline; gap: 16px; margin-bottom: 28px; }
.section-index { color: var(--atlas-gold); font: 500 12px/1.5 var(--atlas-mono); letter-spacing: .14em; }
.section-heading h2 { margin: 0; font: 700 clamp(26px, 4vw, 46px)/1.35 var(--atlas-display); letter-spacing: .05em; }
.section-heading .section-sub { margin-left: auto; color: var(--atlas-dim); font: 500 10px/1.5 var(--atlas-mono); letter-spacing: .12em; text-transform: uppercase; }
.guide-section h3 { margin: 34px 0 11px; color: var(--atlas-gold-soft); font: 700 23px/1.5 var(--atlas-display); }
.guide-section h4 { margin: 25px 0 7px; color: var(--atlas-cyan); font: 700 17px/1.5 var(--atlas-display); }
.guide-section p { max-width: 78ch; margin: 0 0 18px; color: var(--atlas-muted); }
.guide-section strong { color: var(--atlas-ink); }
.guide-section em { color: var(--atlas-gold-soft); font-style: normal; }
.guide-section ul, .guide-section ol { max-width: 78ch; margin: 16px 0 24px; padding-left: 1.35em; color: var(--atlas-muted); }
.guide-section li { margin: 7px 0; padding-left: 5px; }
.guide-section li::marker { color: var(--atlas-gold); }

.summary-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin: 34px 0 12px; }
.summary-card { min-height: 128px; padding: 18px; border: 1px solid var(--atlas-line-soft); background: rgba(8, 13, 29, .78); }
.summary-card .value { display: block; color: var(--atlas-gold-soft); font: 700 clamp(23px, 3vw, 34px)/1.2 var(--atlas-display); }
.summary-card .label { display: block; margin-top: 8px; color: var(--atlas-muted); font-size: 13px; line-height: 1.7; }
.summary-card small { color: var(--atlas-cyan); font: 500 10px/1.5 var(--atlas-mono); letter-spacing: .08em; }

.two-column { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.three-column { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.atlas-panel { padding: 25px; }
.atlas-panel h3, .atlas-panel h4 { margin-top: 0; }
.atlas-panel p:last-child { margin-bottom: 0; }
.note { border-left: 2px solid var(--atlas-cyan); padding: 18px 20px; background: rgba(127, 216, 255, .055); }
.note.warning { border-left-color: var(--atlas-rose); background: rgba(255, 158, 194, .055); }
.note.gold { border-left-color: var(--atlas-gold); background: rgba(246, 198, 103, .055); }
.note strong { color: var(--atlas-gold-soft); }
.mini-label { color: var(--atlas-dim); font: 500 10px/1.6 var(--atlas-mono); letter-spacing: .12em; text-transform: uppercase; }

.data-table-wrap { margin: 26px 0; overflow-x: auto; border: 1px solid var(--atlas-line); background: rgba(5, 9, 20, .7); }
table { width: 100%; min-width: 630px; border-collapse: collapse; text-align: left; }
caption { padding: 15px 17px; color: var(--atlas-muted); font-size: 13px; text-align: left; caption-side: top; }
th, td { padding: 14px 16px; border-top: 1px solid var(--atlas-line-soft); vertical-align: top; }
th { color: var(--atlas-gold-soft); font: 500 11px/1.5 var(--atlas-mono); letter-spacing: .08em; white-space: nowrap; }
td { color: var(--atlas-muted); font-size: 14px; }
td strong { color: var(--atlas-ink); font-family: var(--atlas-display); font-size: 16px; }
tr:hover td { background: rgba(127, 216, 255, .035); }

.figure-card { margin: 32px 0; padding: 22px; border: 1px solid var(--atlas-line); background: rgba(5, 9, 20, .72); }
.figure-card svg { display: block; width: 100%; height: auto; max-height: 420px; }
.figure-card figcaption { margin-top: 14px; color: var(--atlas-dim); font-size: 12px; line-height: 1.8; }
.diagram-label { fill: #eef1fb; font: 500 14px "Noto Sans JP", sans-serif; }
.diagram-small { fill: #a3abc6; font: 500 11px "IBM Plex Mono", monospace; letter-spacing: .04em; }

.steps { display: grid; gap: 10px; margin: 24px 0; counter-reset: guide-step; }
.step { display: grid; grid-template-columns: 54px minmax(0, 1fr); gap: 18px; align-items: start; padding: 18px; border: 1px solid var(--atlas-line-soft); background: rgba(8, 13, 29, .7); counter-increment: guide-step; }
.step::before { content: counter(guide-step, decimal-leading-zero); color: var(--atlas-gold); font: 500 13px/1.5 var(--atlas-mono); }
.step h3 { margin: 0 0 6px; font-size: 19px; }
.step p { margin: 0; font-size: 14px; }

.link-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 24px; }
.link-card { display: block; min-height: 116px; padding: 18px; border: 1px solid var(--atlas-line-soft); text-decoration: none; background: rgba(8, 13, 29, .66); transition: border-color .2s ease, background .2s ease, transform .2s ease; }
.link-card:hover { border-color: var(--atlas-gold); background: rgba(22, 29, 57, .72); transform: translateY(-2px); }
.link-card .link-code { color: var(--atlas-cyan); font: 500 10px/1.5 var(--atlas-mono); letter-spacing: .12em; }
.link-card strong { display: block; margin-top: 10px; font: 700 18px/1.45 var(--atlas-display); }
.link-card span { display: block; margin-top: 5px; color: var(--atlas-muted); font-size: 12px; line-height: 1.6; }

.source-list { display: grid; gap: 10px; margin: 25px 0 0; padding: 0; list-style: none; }
.source-list li { margin: 0; padding: 14px 16px; border: 1px solid var(--atlas-line-soft); color: var(--atlas-muted); font-size: 13px; }
.source-list a { color: var(--atlas-cyan); text-decoration: underline; text-decoration-color: rgba(127, 216, 255, .4); text-underline-offset: 3px; }
.source-list .source-type { display: block; margin-bottom: 5px; color: var(--atlas-gold); font: 500 10px/1.5 var(--atlas-mono); letter-spacing: .12em; }
.last-checked { margin-top: 34px; color: var(--atlas-dim); font: 500 11px/1.7 var(--atlas-mono); letter-spacing: .05em; }

details { margin: 10px 0; border: 1px solid var(--atlas-line-soft); background: rgba(8, 13, 29, .66); }
summary { cursor: pointer; padding: 16px 18px; color: var(--atlas-ink); font-family: var(--atlas-display); font-weight: 700; }
details > div { padding: 0 18px 16px; color: var(--atlas-muted); font-size: 14px; }

.guide-footer { border-top: 1px solid var(--atlas-line); background: rgba(3, 5, 13, .8); }
.guide-footer-inner { max-width: 1240px; margin: 0 auto; padding: 48px 28px 30px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 26px; }
.footer-word { color: var(--atlas-gold); font: 700 clamp(25px, 3vw, 42px)/1.1 var(--atlas-display); letter-spacing: .1em; }
.footer-word em { color: var(--atlas-cyan); font-style: normal; }
.footer-grid h2 { margin: 0 0 11px; color: var(--atlas-gold-soft); font: 500 11px/1.5 var(--atlas-mono); letter-spacing: .13em; }
.footer-grid p, .footer-grid ul { margin: 0; color: var(--atlas-muted); font-size: 13px; }
.footer-grid ul { padding-left: 1.1em; }
.footer-grid li { margin: 4px 0; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; margin-top: 38px; padding-top: 18px; border-top: 1px solid var(--atlas-line-soft); color: var(--atlas-dim); font: 500 10px/1.6 var(--atlas-mono); letter-spacing: .06em; }

@media (max-width: 900px) {
  .guide-header { align-items: flex-start; flex-direction: column; }
  .guide-nav { justify-content: flex-start; }
  .guide-hero { grid-template-columns: 1fr; gap: 28px; }
  .guide-hero::after { right: 0; bottom: 18px; }
  .summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .three-column, .link-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  body.guide-body { font-size: 15px; }
  .guide-shell, .guide-footer-inner { padding-right: 18px; padding-left: 18px; }
  .guide-header { padding: 18px; }
  .guide-main { padding-top: 36px; padding-bottom: 76px; }
  .guide-crumbs { margin-bottom: 28px; }
  .guide-hero { padding-bottom: 42px; }
  .guide-hero h1 { font-size: clamp(34px, 11vw, 54px); }
  .guide-lead { font-size: 16px; }
  .answer-panel { padding: 19px; }
  .answer-panel p { font-size: 18px; }
  .guide-section { padding: 42px 0; }
  .section-heading { display: block; }
  .section-heading h2 { margin-top: 6px; }
  .section-heading .section-sub { display: block; margin: 7px 0 0; }
  .summary-grid, .two-column, .three-column, .link-grid, .footer-grid { grid-template-columns: 1fr; }
  .summary-card { min-height: auto; }
  .atlas-panel { padding: 20px; }
  .step { grid-template-columns: 40px minmax(0, 1fr); gap: 10px; padding: 15px; }
  .footer-bottom { display: block; }
  .footer-bottom span { display: block; margin-top: 7px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}
@media print {
  body.guide-body { color: #111; background: #fff; }
  body.guide-body::before, .guide-header, .guide-footer, .link-grid { display: none; }
  .guide-section p, .guide-section li, td { color: #222; }
  .guide-main { padding: 0; }
  .answer-panel, .atlas-panel, .data-table-wrap, .figure-card { background: #fff; box-shadow: none; border-color: #aaa; }
}