:root {
  --paper: #f3efe5;
  --paper-2: #e8e2d3;
  --ink: #101c2b;
  --ink-2: #25364a;
  --muted: #68717a;
  --vermilion: #e3472f;
  --cyan: #00abc2;
  --line: rgba(16, 28, 43, .17);
  --white: #fffdf7;
  --shadow: 0 24px 64px rgba(16, 28, 43, .12);
  --max: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 8% 5%, rgba(0,171,194,.10), transparent 23rem),
    linear-gradient(rgba(16,28,43,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16,28,43,.035) 1px, transparent 1px),
    var(--paper);
  background-size: auto, 40px 40px, 40px 40px, auto;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Noto Sans JP", "Noto Sans CJK JP", "Yu Gothic", sans-serif;
  line-height: 1.65;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; }

.skip-link {
  position: fixed;
  top: .7rem;
  left: .7rem;
  z-index: 100;
  padding: .65rem 1rem;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(243, 239, 229, .88);
  backdrop-filter: blur(18px);
}

.nav-shell {
  width: min(calc(100% - 2rem), var(--max));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .8rem;
  text-decoration: none;
  font-weight: 760;
  letter-spacing: -.02em;
  white-space: nowrap;
}

.brand-mark {
  width: 34px;
  height: 34px;
  position: relative;
  border: 2px solid var(--ink);
  border-radius: 50%;
}
.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 6px -7px;
  border: 2px solid var(--vermilion);
  border-left-color: transparent;
  border-right-color: transparent;
  border-radius: 50%;
  transform: rotate(-24deg);
}
.brand-mark::after {
  inset: 13px 5px;
  border: 0;
  height: 4px;
  background: var(--cyan);
  transform: rotate(18deg);
}

.main-nav { display: flex; align-items: center; gap: 1.3rem; }
.main-nav a {
  position: relative;
  color: var(--ink-2);
  font-size: .83rem;
  font-weight: 650;
  letter-spacing: .04em;
  text-decoration: none;
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -.45rem;
  height: 2px;
  background: var(--vermilion);
  transition: right .2s ease;
}
.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after { right: 0; }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  background: rgba(255,255,255,.45);
}
.lang-switch button {
  border: 0;
  border-radius: 999px;
  padding: .3rem .55rem;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: .7rem;
  font-weight: 800;
}
.lang-switch button[aria-pressed="true"] { background: var(--ink); color: var(--white); }

.menu-toggle { display: none; border: 0; background: transparent; font-weight: 800; }

main { overflow: hidden; }
.shell { width: min(calc(100% - 2rem), var(--max)); margin: 0 auto; }
.section { padding: clamp(4rem, 7vw, 7rem) 0; }
.section-tight { padding: 3rem 0; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin: 0 0 1.2rem;
  color: var(--vermilion);
  font-size: .75rem;
  font-weight: 820;
  letter-spacing: .15em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 30px; height: 2px; background: currentColor; }

h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.12; letter-spacing: -.035em; }
h1 { font-size: clamp(3.2rem, 8vw, 7.5rem); margin-bottom: 1.5rem; }
h2 { font-size: clamp(2rem, 4vw, 4.1rem); margin-bottom: 1.3rem; }
h3 { font-size: clamp(1.15rem, 2vw, 1.55rem); }
.lead { max-width: 720px; color: var(--ink-2); font-size: clamp(1.03rem, 2vw, 1.3rem); }
.muted { color: var(--muted); }
.small { font-size: .82rem; }

.hero { padding: clamp(5rem, 10vw, 9rem) 0 4rem; position: relative; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(300px, .7fr); align-items: end; gap: 3rem; }
.hero h1 span { display: block; }
.hero h1 .accent { color: var(--vermilion); }
.hero h1 .latin { color: var(--ink-2); font-size: .32em; letter-spacing: .06em; margin-top: .7rem; }

.orbit {
  aspect-ratio: 1;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: radial-gradient(circle, var(--ink) 0 7%, transparent 7.4%), radial-gradient(circle at 50%, transparent 0 45%, rgba(0,171,194,.16) 45.4% 46%, transparent 46.4%);
  animation: drift 8s ease-in-out infinite;
}
.orbit::before, .orbit::after {
  content: "";
  position: absolute;
  inset: 14%;
  border: 2px solid var(--vermilion);
  border-left-color: transparent;
  border-radius: 50%;
  transform: rotate(35deg);
}
.orbit::after { inset: 28%; border-color: var(--cyan) transparent var(--cyan) var(--cyan); transform: rotate(-25deg); }
.orbit-label { position: absolute; right: 0; top: 15%; font-family: ui-monospace, monospace; font-size: .72rem; letter-spacing: .1em; }
@keyframes drift { 0%,100% { transform: translateY(0) rotate(0); } 50% { transform: translateY(-10px) rotate(2deg); } }

.actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  min-height: 48px;
  padding: .75rem 1.2rem;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--white);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 760;
  letter-spacing: .04em;
  transition: transform .2s, box-shadow .2s;
}
.button:hover { transform: translateY(-2px); box-shadow: 6px 6px 0 var(--cyan); }
.button.alt { background: transparent; color: var(--ink); }
.button.alt:hover { box-shadow: 6px 6px 0 var(--vermilion); }

.status-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line);
  background: rgba(255,253,247,.65);
  box-shadow: var(--shadow);
}
.metric { padding: 1.4rem; border-right: 1px solid var(--line); }
.metric:last-child { border-right: 0; }
.metric strong { display: block; font-size: 1.2rem; }
.metric span { color: var(--muted); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.live-dot { display: inline-block; width: 8px; height: 8px; margin-right: .4rem; border-radius: 50%; background: #38a169; box-shadow: 0 0 0 5px rgba(56,161,105,.13); }
.live-dot.degraded { background: var(--vermilion); box-shadow: 0 0 0 5px rgba(227,71,47,.13); }

.grid-2, .grid-3 { display: grid; gap: 1.2rem; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  position: relative;
  padding: clamp(1.4rem, 3vw, 2.2rem);
  border: 1px solid var(--line);
  background: rgba(255,253,247,.72);
  overflow: hidden;
}
.card::before { content: ""; position: absolute; left: 0; top: 0; width: 54px; height: 4px; background: var(--vermilion); }
.card.cyan::before { background: var(--cyan); }
.card a:not(.button) { text-decoration-color: var(--cyan); text-underline-offset: 3px; }
.card dl { display: grid; grid-template-columns: max-content 1fr; gap: .45rem 1rem; font-size: .84rem; }
.card dt { color: var(--muted); }
.card dd { margin: 0; text-align: right; font-family: ui-monospace, monospace; overflow-wrap: anywhere; }

.release-list { border-top: 1px solid var(--line); }
.release-row {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}
.release-row time { color: var(--muted); font-family: ui-monospace, monospace; font-size: .75rem; }
.release-row a { font-weight: 680; text-decoration: none; }
.release-row a:hover { color: var(--vermilion); }
.source-tag { padding: .22rem .55rem; border: 1px solid var(--line); border-radius: 999px; font-size: .67rem; font-weight: 800; letter-spacing: .06em; }

.page-hero { padding: 5.5rem 0 2.5rem; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(2.8rem, 6vw, 6rem); }
.page-hero h1 small { display: block; color: var(--vermilion); font-size: .2em; letter-spacing: .12em; margin-top: 1rem; }

.mirror-item { display: grid; grid-template-columns: 1fr auto; gap: 1.5rem; }
.mirror-item .filename { font-family: ui-monospace, monospace; font-size: .85rem; overflow-wrap: anywhere; }
.hash { padding: .7rem; background: rgba(16,28,43,.06); font-family: ui-monospace, monospace; font-size: .68rem; overflow-wrap: anywhere; }

.callout { padding: 1.4rem 1.6rem; border-left: 4px solid var(--cyan); background: rgba(0,171,194,.08); }
.callout.warn { border-color: var(--vermilion); background: rgba(227,71,47,.07); }

.speed-panel { padding: clamp(1.5rem, 4vw, 3rem); color: var(--white); background: var(--ink); }
.speed-value { font-size: clamp(3rem, 8vw, 7rem); font-weight: 780; letter-spacing: -.07em; line-height: 1; }
.speed-value small { color: var(--cyan); font-size: .2em; letter-spacing: .02em; }
.progress { height: 4px; margin: 1.5rem 0; background: rgba(255,255,255,.16); }
.progress span { display: block; height: 100%; width: 0; background: var(--vermilion); transition: width .2s; }

.status-strip-wide { grid-template-columns: repeat(4, 1fr); }
.speed-lab { position: relative; overflow: hidden; }
.speed-lab::after {
  content: "01";
  position: absolute;
  right: -1rem;
  top: -4rem;
  color: rgba(255,255,255,.035);
  font-size: 18rem;
  font-weight: 850;
  line-height: 1;
  pointer-events: none;
}
.speed-lab-head { position: relative; z-index: 1; display: flex; align-items: flex-start; justify-content: space-between; gap: 2rem; }
.speed-title { max-width: 720px; margin-bottom: 0; font-size: clamp(2rem, 5vw, 4.6rem); }
.test-state { flex: 0 0 auto; padding: .45rem .75rem; border: 1px solid rgba(255,255,255,.25); color: var(--cyan); font: 750 .75rem/1.2 ui-monospace, monospace; letter-spacing: .08em; text-transform: uppercase; }
.lab-results { position: relative; z-index: 1; display: grid; grid-template-columns: 1.35fr repeat(3, 1fr); margin-top: 2.4rem; border: 1px solid rgba(255,255,255,.18); }
.lab-result { min-width: 0; padding: 1.25rem; border-right: 1px solid rgba(255,255,255,.18); }
.lab-result:last-child { border-right: 0; }
.lab-result span, .lab-result small { display: block; color: rgba(255,255,255,.58); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; }
.lab-result strong { display: block; margin: .45rem 0 .25rem; color: var(--white); font-size: clamp(1.8rem, 4vw, 3.8rem); line-height: 1; letter-spacing: -.055em; }
.lab-result.primary strong { color: var(--cyan); }
.lab-progress { position: relative; z-index: 1; margin-top: 2rem; }
.test-note { position: relative; z-index: 1; min-height: 1.7em; color: rgba(255,255,255,.72); }
.lab-controls { position: relative; z-index: 1; display: flex; flex-wrap: wrap; align-items: center; gap: 1.2rem; }
.speed-panel .button { border-color: var(--white); background: var(--white); color: var(--ink); cursor: pointer; }
.speed-panel .button:disabled { cursor: wait; opacity: .58; transform: none; box-shadow: none; }
.upload-choice { display: inline-flex; align-items: center; gap: .55rem; color: rgba(255,255,255,.76); font-size: .82rem; cursor: pointer; }
.upload-choice input { width: 1.05rem; height: 1.05rem; accent-color: var(--cyan); }

.prose { max-width: 790px; }
.prose h2 { margin-top: 3.5rem; font-size: clamp(1.7rem, 3vw, 2.6rem); }
.prose h3 { margin-top: 2.2rem; }
.prose li + li { margin-top: .55rem; }
.prose code { padding: .12rem .35rem; background: rgba(16,28,43,.08); font-family: ui-monospace, monospace; font-size: .85em; }

.site-footer { margin-top: 4rem; color: var(--paper); background: var(--ink); }
.footer-grid { padding: 3.2rem 0; display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 2rem; }
.site-footer a { color: inherit; text-decoration-color: var(--cyan); text-underline-offset: 3px; }
.footer-bottom { padding: 1rem 0; border-top: 1px solid rgba(255,255,255,.14); color: rgba(255,255,255,.62); font-size: .75rem; }

.i18n-en { display: none; }
body[data-lang="en"] .i18n-ja { display: none; }
body[data-lang="en"] .i18n-en { display: initial; }

@media (max-width: 880px) {
  .hero-grid, .grid-3, .footer-grid { grid-template-columns: 1fr; }
  .orbit { width: min(340px, 80vw); margin: 1rem auto; }
  .status-strip { grid-template-columns: repeat(2, 1fr); }
  .metric:nth-child(2) { border-right: 0; }
  .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .main-nav { display: none; position: absolute; top: 72px; left: 0; right: 0; padding: 1.5rem; flex-direction: column; align-items: flex-start; background: var(--paper); border-bottom: 1px solid var(--line); }
  .main-nav.open { display: flex; }
  .menu-toggle { display: block; }
  .release-row { grid-template-columns: 1fr auto; }
  .release-row time { grid-column: 1 / -1; }
  .lab-results { grid-template-columns: repeat(2, 1fr); }
  .lab-result:nth-child(2) { border-right: 0; }
  .lab-result:nth-child(-n+2) { border-bottom: 1px solid rgba(255,255,255,.18); }
}

@media (max-width: 580px) {
  .grid-2, .status-strip { grid-template-columns: 1fr; }
  .metric { border-right: 0; border-bottom: 1px solid var(--line); }
  .mirror-item { grid-template-columns: 1fr; }
  .brand-label { display: none; }
  .speed-lab-head { display: block; }
  .test-state { display: inline-block; margin-top: 1.2rem; }
  .lab-results { grid-template-columns: 1fr; }
  .lab-result { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.18); }
  .lab-result:nth-child(2) { border-right: 0; }
  .lab-result:last-child { border-bottom: 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
}