:root {
  --color-paper: oklch(94% 0.012 85);
  --color-paper-2: oklch(91% 0.014 85);
  --color-paper-muted: oklch(79% 0.012 85);
  --color-paper-dim: oklch(68% 0.012 85);
  --color-paper-rule: oklch(94% 0.012 85 / 0.55);
  --color-ink: oklch(22% 0.012 180);
  --color-ink-2: oklch(36% 0.014 180);
  --color-accent: oklch(42% 0.09 190);
  --color-accent-soft: oklch(82% 0.04 180);
  --color-accent-ink: oklch(96% 0.012 85);
  --color-signal: oklch(67% 0.14 65);
  --color-rule: oklch(72% 0.018 180);
  --color-focus: oklch(57% 0.19 190);
  --color-hairpin: oklch(34% 0.008 250);
  --color-shadow: oklch(22% 0.012 180 / 0.16);
  --font-display: "Yu Mincho", "Hiragino Mincho ProN", "YuMincho", serif;
  --font-body: "Geist", "Inter", "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --page-gutter: clamp(1.25rem, 7vw, 7.5rem);
  --rule: 1px;
  --ease-out: cubic-bezier(.16,1,.3,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  overflow-x: clip;
}
a { color: inherit; }
button { font: inherit; }
::selection { background: var(--color-accent); color: var(--color-paper); }

.site-header {
  height: 88px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 clamp(24px, 4vw, 68px);
  border-bottom: var(--rule) solid var(--color-rule);
  background: color-mix(in oklch, var(--color-paper) 92%, transparent);
  backdrop-filter: blur(18px);
  position: sticky;
  top: 0;
  z-index: 30;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  text-decoration: none;
}
.brand-copy { display: grid; gap: 2px; }
.brand-copy b { font-size: 18px; letter-spacing: .12em; }
.brand-copy small { font-size: 10px; letter-spacing: .14em; font-weight: 700; }
.brand-mark { width: 42px; height: 36px; display: block; position: relative; }
.brand-mark i { position: absolute; display: block; height: 4px; border-radius: 1px; background: var(--color-hairpin); transform: rotate(-57deg); transform-origin: center; }
.brand-mark i:first-child { width: 36px; left: -2px; top: 15px; }
.brand-mark i:last-child { width: 29px; left: 17px; top: 18px; }
.nav { display: flex; align-items: center; gap: clamp(20px,3vw,48px); }
.nav a, .header-link { text-decoration: none; font-size: 10px; font-weight: 800; letter-spacing: .14em; }
.nav a { padding: 12px 0; position: relative; }
.nav a::after { content:""; position:absolute; left:0; right:0; bottom:6px; height:2px; background:var(--color-accent); transform:scaleX(0); transform-origin:left; transition:transform 180ms var(--ease-out); }
.nav a:hover::after { transform:scaleX(1); }
.header-link { justify-self:end; border:1px solid var(--color-ink); padding:12px 16px; }

.hero {
  min-height: clamp(42rem, 82svh, 56rem);
  display: grid;
  grid-template-columns: minmax(0,.84fr) minmax(0,1.16fr);
  align-items: center;
  gap: clamp(2.25rem,6vw,6rem);
  padding: clamp(4rem,7vw,6.5rem) var(--page-gutter) clamp(5rem,10vw,9rem);
  position: relative;
}
.hero-copy > * { animation: rise 1.1s var(--ease-out) both; }
.hero-copy > :nth-child(2) { animation-delay:.08s; }
.hero-copy > :nth-child(3) { animation-delay:.16s; }
.hero-copy > :nth-child(4) { animation-delay:.24s; }
.kicker { margin:0 0 28px; font-size:10px; font-weight:800; letter-spacing:.14em; }
.hero h1, .section-heading h2, .routing-title h2 {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -.055em;
}
.hero h1 { margin:0; font-size:clamp(3.5rem,7vw,7.2rem); line-height:.98; }
.hero h1 span { color:var(--color-accent); }
.lead { max-width: 47ch; margin: clamp(2rem,4vw,3.5rem) 0 2rem; font-size: 1rem; line-height:1.8; letter-spacing:.025em; }
.text-link { width:fit-content; min-height:44px; display:flex; gap:42px; align-items:center; text-decoration:none; border-bottom:1px solid var(--color-ink); font-size:13px; font-weight:700; }
.text-link span { color:var(--color-accent); }
.vertical-note { position:absolute; right:24px; top:50%; writing-mode:vertical-rl; margin:0; font-size:9px; letter-spacing:.18em; }

.hero-board {
  aspect-ratio: 1.18/1;
  max-width: 720px;
  width: 100%;
  justify-self: center;
  background: var(--color-ink);
  color: var(--color-paper);
  padding: clamp(24px,4vw,54px);
  position: relative;
  transform: rotate(-2deg);
  box-shadow: 0 26px 64px var(--color-shadow);
  overflow: hidden;
  animation: boardIn 1.45s var(--ease-out) both;
}
.hero-board::before { content:""; position:absolute; width:42%; aspect-ratio:1; border:1px solid var(--color-paper-rule); border-radius:50%; right:-10%; top:-10%; }
.hero-board::after { content:""; position:absolute; left:0; right:0; bottom:24%; height:1px; background:var(--color-paper-rule); }
.board-topline, .board-caption { position:relative; z-index:2; display:flex; justify-content:space-between; gap:20px; text-transform:uppercase; font-size:10px; letter-spacing:.16em; font-weight:800; }
.board-number { position:relative; z-index:2; margin:7% 0 1%; font-family:var(--font-display); font-size:clamp(9rem,22vw,20rem); line-height:.74; letter-spacing:-.08em; color:var(--color-paper); }
.board-caption { align-items:end; }
.board-caption span:first-child { color:var(--color-accent-soft); }
.board-grid { position:absolute; right:7%; bottom:7%; width:29%; display:grid; grid-template-columns:repeat(3,1fr); gap:7px; transform:rotate(3deg); }
.board-grid i { aspect-ratio:1; border:1px solid var(--color-paper-rule); }
.board-grid i:nth-child(2), .board-grid i:nth-child(6), .board-grid i:nth-child(8) { background:var(--color-accent); border-color:var(--color-accent); }

.welcome { min-height:136px; display:grid; grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr); gap:40px; align-items:center; padding:30px var(--page-gutter); background:var(--color-ink); color:var(--color-paper); }
.welcome p { margin:0; font-family:var(--font-display); font-size:clamp(1.6rem,2.8vw,2.5rem); }
.welcome small { max-width:64ch; font-size:1rem; line-height:1.7; color:var(--color-paper-muted); }

.overview { display:grid; grid-template-columns:repeat(4,1fr); border-bottom:1px solid var(--color-rule); }
.overview article { min-height:220px; padding:28px clamp(20px,3vw,44px); border-right:1px solid var(--color-rule); display:grid; grid-template-rows:auto 1fr auto; }
.overview article:last-child { border-right:0; }
.overview span { font-size:10px; font-weight:800; letter-spacing:.14em; color:var(--color-ink-2); }
.overview b { align-self:center; font-family:var(--font-display); font-size:clamp(4rem,7vw,7rem); line-height:1; font-weight:500; color:var(--color-accent); }
.overview p { margin:0; font-size:11px; text-transform:uppercase; letter-spacing:.15em; font-weight:800; }

.services { padding:clamp(5.5rem,11vw,10rem) var(--page-gutter); }
.section-heading { display:grid; grid-template-columns:minmax(0,1fr) auto; align-items:end; gap:32px; margin-bottom:50px; }
.section-heading h2, .routing-title h2 { margin:0; font-size:clamp(3rem,6vw,5.6rem); line-height:.98; }
.filters { display:flex; flex-wrap:wrap; justify-content:flex-end; gap:8px; }
.filter { border:1px solid var(--color-rule); background:transparent; color:var(--color-ink); min-height:42px; padding:0 14px; font-size:10px; font-weight:800; letter-spacing:.12em; cursor:pointer; transition:background 180ms var(--ease-out), color 180ms var(--ease-out), border 180ms var(--ease-out); }
.filter:hover, .filter.is-active { background:var(--color-ink); color:var(--color-paper); border-color:var(--color-ink); }

.service-list { border-top:1px solid var(--color-rule); }
.service-card { display:grid; grid-template-columns:64px minmax(0,1fr) auto; gap:clamp(20px,3vw,48px); align-items:start; padding:clamp(28px,4vw,52px) 0; border-bottom:1px solid var(--color-rule); transition:padding 220ms var(--ease-out), background 220ms var(--ease-out); }
.service-card:hover { padding-left:20px; padding-right:20px; background:var(--color-paper-2); }
.service-card[hidden] { display:none; }
.service-index { font-size:10px; font-weight:800; letter-spacing:.14em; color:var(--color-ink-2); padding-top:6px; }
.service-meta { display:flex; align-items:center; flex-wrap:wrap; gap:12px; font-size:9px; font-weight:800; letter-spacing:.13em; color:var(--color-ink-2); }
.route { display:inline-flex; align-items:center; min-height:26px; padding:0 9px; border:1px solid var(--color-rule); color:var(--color-ink); }
.route-tunnel { border-color:var(--color-accent); color:var(--color-accent); }
.route-direct { background:var(--color-ink); color:var(--color-paper); border-color:var(--color-ink); }
.route-proxy { background:var(--color-accent-soft); border-color:var(--color-accent-soft); }
.service-card h3 { margin:16px 0 8px; font-family:var(--font-display); font-size:clamp(2.3rem,4.5vw,4.6rem); line-height:1; font-weight:500; letter-spacing:-.045em; }
.host { display:inline-block; text-decoration:none; font-size:clamp(.9rem,1.6vw,1.1rem); font-weight:700; letter-spacing:.015em; border-bottom:1px solid var(--color-ink); padding-bottom:3px; }
.host:hover { color:var(--color-accent); border-color:var(--color-accent); }
.host-secondary { color:var(--color-ink-2); border-color:var(--color-rule); }
.host-muted { border-bottom:0; color:var(--color-ink-2); }
.host-stack { display:flex; flex-wrap:wrap; gap:10px 18px; }
.service-main p { max-width:64ch; margin:18px 0 0; color:var(--color-ink-2); line-height:1.7; font-size:.92rem; }
.status { display:inline-flex; align-items:center; gap:8px; min-height:32px; padding:0 10px; border:1px solid var(--color-rule); font-size:9px; letter-spacing:.13em; font-weight:800; white-space:nowrap; }
.status i { width:7px; height:7px; border-radius:50%; background:var(--color-accent); box-shadow:0 0 0 3px color-mix(in oklch,var(--color-accent) 18%,transparent); }

.routing { display:grid; grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr); gap:clamp(3rem,8vw,8rem); padding:clamp(5.5rem,12vw,11rem) var(--page-gutter); background:var(--color-ink); color:var(--color-paper); }
.routing-title { position:sticky; top:140px; align-self:start; }
.routing-title .kicker { color:var(--color-paper-muted); }
.routing-title h2 span { color:var(--color-accent-soft); }
.routing-grid { border-top:1px solid var(--color-paper-rule); }
.routing-grid article { padding:32px 0 42px; border-bottom:1px solid var(--color-paper-rule); }
.routing-head { display:grid; grid-template-columns:48px 1fr auto; align-items:baseline; gap:16px; }
.routing-head span, .routing-head b { font-size:9px; letter-spacing:.14em; color:var(--color-paper-muted); }
.routing-head h3 { margin:0; font-family:var(--font-display); font-size:clamp(1.8rem,3vw,3rem); font-weight:500; }
.routing-grid ul { list-style:none; padding:0 0 0 64px; margin:28px 0 0; }
.routing-grid li { display:flex; justify-content:space-between; gap:20px; padding:13px 0; border-top:1px solid color-mix(in oklch,var(--color-paper) 18%,transparent); font-size:.88rem; letter-spacing:.02em; }
.routing-grid li small { font-size:9px; letter-spacing:.13em; color:var(--color-accent-soft); font-weight:800; }

.footer { min-height:150px; display:grid; grid-template-columns:1fr auto 1fr; align-items:center; gap:28px; padding:30px var(--page-gutter); border-top:1px solid var(--color-rule); }
.footer p, .footer a { margin:0; font-size:9px; font-weight:800; letter-spacing:.13em; }
.footer a { justify-self:end; text-decoration:none; }

@keyframes rise { from { opacity:0; transform:translateY(28px); } to { opacity:1; transform:none; } }
@keyframes boardIn { from { opacity:0; transform:translate(50px,38px) rotate(4deg); } to { opacity:1; transform:rotate(-2deg); } }

@media (max-width: 900px) {
  .site-header { grid-template-columns:1fr auto; }
  .nav { display:none; }
  .hero { grid-template-columns:1fr; padding-top:64px; }
  .hero-board { max-width:620px; }
  .vertical-note { display:none; }
  .overview { grid-template-columns:repeat(2,1fr); }
  .overview article:nth-child(2) { border-right:0; }
  .overview article:nth-child(-n+2) { border-bottom:1px solid var(--color-rule); }
  .section-heading { grid-template-columns:1fr; align-items:start; }
  .filters { justify-content:flex-start; }
  .routing { grid-template-columns:1fr; }
  .routing-title { position:static; }
  .footer { grid-template-columns:1fr auto; }
  .footer p { display:none; }
}

@media (max-width: 620px) {
  .site-header { height:74px; padding:0 18px; }
  .brand-copy small, .header-link { font-size:8px; }
  .brand-mark { transform:scale(.85); transform-origin:left center; width:36px; }
  .header-link { padding:10px 12px; }
  .hero { min-height:auto; padding:58px 20px 76px; gap:58px; }
  .hero h1 { font-size:clamp(3.1rem,16vw,5rem); }
  .hero-board { transform:rotate(-1deg); }
  .board-number { font-size:42vw; }
  .welcome { grid-template-columns:1fr; padding:30px 20px; gap:10px; }
  .overview { grid-template-columns:1fr 1fr; }
  .overview article { min-height:170px; padding:20px; }
  .services, .routing { padding-left:20px; padding-right:20px; }
  .service-card { grid-template-columns:32px minmax(0,1fr); gap:14px; }
  .service-card:hover { padding-left:8px; padding-right:8px; }
  .status { grid-column:2; justify-self:start; }
  .service-card h3 { font-size:2.5rem; }
  .routing-head { grid-template-columns:34px 1fr; }
  .routing-head b { display:none; }
  .routing-grid ul { padding-left:48px; }
  .footer { padding:28px 20px; }
  .footer-brand .brand-copy small { display:none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration:.001ms !important; animation-iteration-count:1 !important; scroll-behavior:auto !important; transition-duration:.001ms !important; }
}