*, *::before, *::after { box-sizing: border-box; }

:root {
  --navy: #070f26;
  --navy-2: #101a36;
  --ink: #172033;
  --muted: #526071;
  --line: #e4e9f1;
  --surface: #ffffff;
  --soft: #f5f7fb;
  --accent: #ffcc00;
  --accent-ink: #2f2500;
  --blue: #0d6efd;
  --green: #138a54;
  --red: #b53b35;
  --sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Yu Gothic", system-ui, sans-serif;
  --mono: "JetBrains Mono", "Consolas", monospace;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--soft);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  min-height: 54px;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 28px;
  color: rgba(255, 255, 255, 0.78);
  background: rgba(7, 15, 38, 0.94);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
}

.topbar b {
  color: #fff;
  letter-spacing: .08em;
}

.topbar span {
  margin-left: auto;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .08em;
}

.hero {
  color: #fff;
  background: linear-gradient(180deg, var(--navy), var(--navy-2));
  border-bottom: 4px solid var(--accent);
}

.hero-inner,
.section {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: center;
  padding: 56px 0 48px;
}

.hero-copy {
  max-width: 920px;
}

.eyebrow {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: .76rem;
  color: var(--accent);
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(2rem, 4.5vw, 3.7rem);
  line-height: 1.18;
  letter-spacing: 0;
}

.lead {
  margin: 0 0 16px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.08rem;
}

.summary {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.button-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 9px 14px;
  color: var(--accent-ink);
  background: var(--accent);
  border: 1px solid var(--accent);
  text-decoration: none;
  font-weight: 700;
}

.button-link.secondary {
  color: #fff;
  background: transparent;
  border-color: rgba(255, 255, 255, 0.28);
}

.hero-media img,
.image-grid img,
.visual-card img,
.wide-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: #fff;
}

.hero-media img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.hero-media.large img {
  aspect-ratio: auto;
  object-fit: contain;
}

.section {
  padding: 42px 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.35;
  letter-spacing: 0;
}

.section-lead {
  max-width: 780px;
  margin: -4px 0 24px;
  color: var(--muted);
  font-size: 1.04rem;
}

.story-grid,
.chapter-grid,
.metric-grid,
.step-grid {
  display: grid;
  gap: 16px;
}

.story-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.chapter-grid {
  grid-template-columns: minmax(0, 1fr) minmax(280px, 38%);
  align-items: start;
}

.metric-grid,
.step-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.panel,
.chapter,
.metric,
.step {
  background: var(--surface);
  border: 1px solid var(--line);
}

.panel,
.chapter {
  padding: 20px;
}

.panel h3,
.chapter h3,
.step h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  line-height: 1.45;
}

.panel p,
.chapter p,
.step p {
  margin: 0;
  color: var(--muted);
}

.label {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 3px 8px;
  color: var(--accent-ink);
  background: var(--accent);
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .06em;
}

.chapter ol,
.chapter ul {
  margin: 14px 0 0;
  padding-left: 1.2em;
  color: var(--muted);
}

.chapter li + li {
  margin-top: 8px;
}

.metric {
  padding: 18px;
}

.metric strong {
  display: block;
  margin-bottom: 4px;
  color: var(--navy);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1;
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: .94rem;
}

.flow {
  display: grid;
  gap: 10px;
}

.flow-item {
  padding: 14px;
  color: #fff;
  background: var(--navy);
  border-left: 5px solid var(--accent);
}

.flow-item b {
  display: block;
  margin-bottom: 2px;
}

.flow-item span {
  display: block;
  color: rgba(255, 255, 255, 0.72);
  font-size: .92rem;
}

.usecase {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.usecase b {
  color: var(--navy);
}

.usecase p {
  margin: 0;
  color: var(--muted);
}

.note {
  padding: 18px 20px;
  background: #fff8d6;
  border: 1px solid #ead77a;
  color: #574400;
}

.step {
  padding: 18px;
  counter-increment: step;
}

.step::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-bottom: 12px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: .85rem;
  font-weight: 700;
}

.step-grid {
  counter-reset: step;
}

.tldr {
  padding-left: 0;
  list-style: none;
  counter-reset: item;
}

.tldr li {
  counter-increment: item;
  position: relative;
  padding: 14px 0 14px 44px;
  border-top: 1px solid var(--line);
}

.tldr li::before {
  content: counter(item);
  position: absolute;
  left: 0;
  top: 17px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  text-align: center;
  line-height: 28px;
  font-family: var(--mono);
  font-size: .78rem;
  font-weight: 700;
  color: var(--accent-ink);
  background: var(--accent);
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.visual-section {
  background: #ffffff;
}

.wide-visual {
  margin: 24px 0 26px;
  background: var(--surface);
}

.wide-visual img {
  border-color: var(--line);
}

.wide-visual figcaption,
.visual-card figcaption {
  padding: 10px 12px;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.55;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 0;
}

.visual-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
}

.visual-card {
  margin: 0;
}

.visual-card img {
  border-color: var(--line);
}

.source-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

.source-list a {
  display: block;
  min-height: 68px;
  padding: 14px 16px;
  color: var(--ink);
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--line);
}

.source-list a:hover {
  border-color: #b9c4d4;
}

.source-list strong {
  display: block;
  font-size: .98rem;
  line-height: 1.45;
}

.source-list span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .72rem;
  overflow-wrap: anywhere;
}

.topbar nav {
  display: flex;
  gap: 2px;
  margin-left: 20px;
}

.topbar nav a {
  padding: 6px 10px;
  color: rgba(255, 255, 255, 0.62);
  font-family: var(--mono);
  font-size: .72rem;
  text-decoration: none;
  letter-spacing: .06em;
  text-transform: uppercase;
  border-radius: 3px;
  transition: color .15s, background .15s;
}

.topbar nav a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.score-versus {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  margin: 24px 0 0;
  padding: 36px 32px;
  color: #fff;
  background: var(--navy);
  position: relative;
  overflow: hidden;
}

.score-versus::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 70%;
  height: 180%;
  background: radial-gradient(ellipse at center, rgba(255, 204, 0, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.score-versus > * { position: relative; }

.score-side { text-align: center; }

.score-side .tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.7);
  font-weight: 600;
}

.score-side.win .tag {
  color: var(--accent);
  font-weight: 700;
}

.score-side .num {
  display: block;
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.04em;
  font-variant-numeric: tabular-nums lining-nums;
}

.score-side.win .num { color: var(--accent); }

.score-side .sub {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: .76rem;
  color: rgba(255, 255, 255, 0.62);
}

.score-vs {
  font-family: var(--mono);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: rgba(255, 255, 255, 0.45);
}

.pullquote {
  margin: 24px 0 0;
  padding: 32px 0 0;
  border-top: 1px solid var(--line);
}

.pullquote q {
  display: block;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--navy);
  quotes: none;
}

.pullquote q::before,
.pullquote q::after { content: ""; }

.pullquote em {
  font-style: normal;
  background: linear-gradient(transparent 65%, rgba(255, 204, 0, 0.32) 65%);
  padding: 0 .12em;
}

.pullquote cite {
  display: block;
  margin-top: 16px;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  font-style: normal;
}

.page-figure {
  margin: 24px 0 0;
  background: #fff;
  border: 1px solid var(--line);
}

.page-figure img {
  display: block;
  width: 100%;
}

.page-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: var(--soft);
  color: var(--muted);
  font-family: var(--mono);
  font-size: .8rem;
  letter-spacing: .04em;
}

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 24px 0 0;
}

.pager a {
  display: block;
  padding: 16px 20px;
  color: var(--ink);
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--line);
}

.pager a:hover { border-color: #b9c4d4; }

.pager a .dir {
  display: block;
  margin-bottom: 4px;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--blue);
  text-transform: uppercase;
}

.pager a strong {
  display: block;
  color: var(--navy);
}

.pager a.next { text-align: right; }

footer.site-foot {
  margin-top: 36px;
  padding: 28px 0 22px;
  background: var(--navy);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  border-top: 4px solid var(--accent);
}

footer.site-foot .inner {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

footer.site-foot .f-title {
  margin-bottom: 8px;
  color: #fff;
  font-weight: 700;
}

footer.site-foot .f-title em {
  font-style: normal;
  color: var(--accent);
}

footer.site-foot .f-meta {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .12em;
  color: rgba(255, 255, 255, 0.5);
  text-transform: uppercase;
}

@media (max-width: 820px) {
  .topbar { padding: 0 20px; flex-wrap: wrap; }
  .topbar nav { display: none; }
  .hero-inner { grid-template-columns: 1fr; padding-top: 42px; }
  .story-grid,
  .chapter-grid,
  .usecase,
  .visual-grid {
    grid-template-columns: 1fr;
  }
  .score-versus {
    grid-template-columns: 1fr;
    padding: 28px 22px;
  }
  .score-vs { transform: rotate(0); }
  .pager { grid-template-columns: 1fr; }
  .pager a.next { text-align: left; }
}