@font-face {
  font-family: "Geist Mono";
  src: url("fonts/geist-mono.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist";
  src: url("fonts/geist.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/jetbrains-mono.woff2") format("woff2");
  font-weight: 400 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/jetbrains-mono-bold.woff2") format("woff2");
  font-weight: 600 900;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --bg: #f4f6f4;
  --bg-2: #e9edea;
  --panel: #fbfcfb;
  --ink: #0c1413;
  --muted: #56635f;
  --faint: #8a9692;
  --line: #d3dad6;
  --line-2: #c2cbc6;
  --accent: #0a6e82;
  --accent-2: #0d8a7a;
  --accent-soft: rgba(10, 110, 130, .09);
  --accent-ink: #ffffff;
  --glow: rgba(10, 110, 130, .18);
  --grid: rgba(12, 20, 19, .045);
  --code-bg: #0b1211;
  --code-bar: #111b1a;
  --code-line: #1f2e2c;
  --code-ink: #dfe9e6;
  --code-dim: #6f8783;
  --good: #1a7d4f;
  --bad: #b5402e;
  --mono: "JetBrains Mono", "Geist Mono", ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Noto Sans CJK JP", "Noto Sans CJK SC", "Hiragino Sans", "Microsoft YaHei", monospace;
  --sans: var(--mono);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #070c0c;
    --bg-2: #0e1615;
    --panel: #0c1413;
    --ink: #e8efec;
    --muted: #93a5a1;
    --faint: #5f736f;
    --line: #1a2927;
    --line-2: #263a37;
    --accent: #5fd4e6;
    --accent-2: #6ee7c5;
    --accent-soft: rgba(95, 212, 230, .08);
    --accent-ink: #041113;
    --glow: rgba(95, 212, 230, .22);
    --grid: rgba(232, 239, 236, .035);
    --code-bg: #050909;
    --code-bar: #0b1312;
    --code-line: #182624;
    --code-ink: #dfe9e6;
    --code-dim: #627975;
    --good: #6ee7a8;
    --bad: #ff8f7a;
  }
}
:root[data-theme="dark"] {
    --bg: #070c0c;
    --bg-2: #0e1615;
    --panel: #0c1413;
    --ink: #e8efec;
    --muted: #93a5a1;
    --faint: #5f736f;
    --line: #1a2927;
    --line-2: #263a37;
    --accent: #5fd4e6;
    --accent-2: #6ee7c5;
    --accent-soft: rgba(95, 212, 230, .08);
    --accent-ink: #041113;
    --glow: rgba(95, 212, 230, .22);
    --grid: rgba(232, 239, 236, .035);
    --code-bg: #050909;
    --code-bar: #0b1312;
    --code-line: #182624;
    --code-ink: #dfe9e6;
    --code-dim: #627975;
    --good: #6ee7a8;
    --bad: #ff8f7a;
}
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 15px/1.85 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: var(--accent-ink); }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: 740px; margin: 0 auto; padding: 0 22px; }
.wide { max-width: 1240px; margin: 0 auto; padding: 0 22px; }

/* ---------- portfolio frame ---------- */
.skip-link { position: fixed; top: 8px; left: 16px; z-index: 30; padding: 12px 18px; background: var(--ink); color: var(--bg); transform: translateY(-160%); opacity: 0; }
.skip-link:focus { transform: translateY(0); opacity: 1; }
.top { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--line); }
.header-inner { max-width: 1440px; margin: auto; min-height: 88px; padding: 0 32px; display: flex; align-items: center; gap: 32px; }
.brand { min-height: 44px; display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font: 600 19px/1.1 var(--mono); letter-spacing: -.04em; flex: none; }
.brand img { width: 28px; height: 28px; }
.brand-caption { display: block; margin-top: 6px; font: 400 9px/1 var(--mono); letter-spacing: .13em; color: var(--faint); }
.primary-nav { display: flex; align-items: center; min-width: 0; }
.primary-nav a { display: flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 15px; color: var(--muted); text-decoration: none; font-size: 11px; white-space: nowrap; border-left: 1px solid var(--line); }
.primary-nav a:last-child { border-right: 1px solid var(--line); }
.primary-nav a span { margin-left: 6px; color: var(--faint); }
.primary-nav a:hover, .primary-nav a[aria-current] { color: var(--accent); background: var(--accent-soft); }
.header-tools { display: flex; align-items: center; gap: 16px; margin-left: auto; flex: none; }
.locale-switcher { display: flex; align-items: center; }
.locale-switcher a { display: grid; place-items: center; min-height: 44px; min-width: 44px; padding: 0 9px; text-decoration: none; font-size: 11px; color: var(--muted); }
.locale-switcher a:hover { color: var(--ink); }
.locale-switcher a[aria-current] { color: var(--accent); box-shadow: inset 0 -2px var(--accent); }
.theme-toggle { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 3px; background: var(--panel); color: var(--ink); cursor: pointer; }
.theme-toggle[hidden] { display: none; }
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle[data-dark="true"] svg { fill: currentColor; }
#main-content, section, #top { scroll-margin-top: 110px; }

/* ---------- introduction & evidence panel ---------- */
.hero-bg { border-bottom: 1px solid var(--line); }
.hero { display: grid; grid-template-columns: 1.18fr 1fr; align-items: start; column-gap: 64px; padding: 80px 0 64px; }
.hero-copy, .hero-evidence { min-width: 0; }
.eyebrow { display: flex; align-items: center; gap: 10px; font: 400 10px/1.6 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin: 0 0 26px; }
.eyebrow::before { content: ""; width: 6px; height: 6px; flex: none; background: var(--accent); }
.hero h1 { font: 600 clamp(30px, 3.3vw, 44px)/1.23 var(--mono); letter-spacing: -.055em; margin: 0 0 26px; text-wrap: balance; }
.hero h1 em { color: var(--accent); font-style: normal; background: linear-gradient(100deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
:lang(en) .hero h1 em { white-space: nowrap; }
.hero .sub { font-size: 14px; line-height: 1.9; color: var(--muted); max-width: 43em; margin: 0 0 28px; }
.hero .sub strong { color: var(--ink); font-weight: 500; }
.cta { display: flex; gap: 10px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px 16px; border-radius: 3px; text-decoration: none; font: 500 11px/1.5 var(--mono); border: 1px solid var(--line-2); transition: border-color .15s, background .15s; }
.btn::after { content: "↗"; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.ghost { color: var(--ink); background: var(--panel); }
.btn.ghost:hover { border-color: var(--accent); }
.hero-evidence { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; box-shadow: 0 4px 20px #00000004; }
.panel-heading { padding: 16px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; font: 500 10px/1.6 var(--mono); letter-spacing: .08em; color: var(--muted); border-bottom: 1px solid var(--line); }
.panel-heading > span:first-child { color: var(--ink); }
.panel-heading > span:last-child { text-align: right; font-size: 9px; }
.facts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); }
.facts div { padding: 24px 20px; background: var(--panel); }
.facts b { display: block; font: 400 31px/1.15 var(--mono); letter-spacing: -.05em; color: var(--accent); margin-bottom: 12px; font-variant-numeric: tabular-nums; }
.facts span { font-size: 11px; line-height: 1.8; color: var(--muted); display: block; }
.asof { border-top: 1px solid var(--line); font: 400 10px/1.8 var(--mono); color: var(--faint); margin: 0; padding: 16px 20px; }
.asof code { padding: 0; border: 0; background: none; font-size: inherit; }
.page-index { border-bottom: 1px solid var(--line); }
.page-index > div { display: grid; grid-template-columns: repeat(4, 1fr); }
.page-index a { display: flex; align-items: center; gap: 14px; padding: 19px 20px; color: var(--muted); text-decoration: none; font-size: 11px; border-left: 1px solid var(--line); }
.page-index a:last-child { border-right: 1px solid var(--line); }
.page-index a:hover { color: var(--accent); background: var(--accent-soft); }
.page-index a span:first-child { color: var(--accent); font-size: 10px; }
.page-index a span:last-child { margin-left: auto; }

/* ---------- sections ---------- */
section { padding: 84px 0; border-bottom: 1px solid var(--line); }
.num {
  display: flex; align-items: center; gap: 14px;
  font: 500 12px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin: 0 0 22px;
}
.num::after { content: ""; flex: 1; height: 1px; background: var(--line); }
h2 { font: 600 clamp(24px, 3.1vw, 32px)/1.3 var(--mono); letter-spacing: -.04em; margin: 0 0 26px; text-wrap: balance; }
h3 { font: 600 17px/1.4 var(--mono); letter-spacing: -.02em; margin: 0 0 6px; }
p { margin: 0 0 18px; }
.big { font: 400 clamp(17px, 2vw, 19px)/1.8 var(--sans); letter-spacing: -.01em; margin-bottom: 22px; color: var(--ink); }
.aside { color: var(--muted); font-size: 15px; }

code { font: 0.88em var(--mono); background: var(--bg-2); padding: 2px 6px; border-radius: 5px; border: 1px solid var(--line); }

/* ---------- code windows ---------- */
pre {
  position: relative; margin: 24px 0; padding: 54px 20px 20px; border-radius: 4px;
  background: var(--code-bg); color: var(--code-ink); border: 1px solid var(--code-line);
  font: 400 13.5px/1.75 var(--mono); overflow-x: auto; tab-size: 2;
  box-shadow: none;
}
pre::before {
  content: attr(data-title);
  position: absolute; left: 0; right: 0; top: 0; height: 36px;
  padding: 0 16px 0 62px; display: flex; align-items: center;
  font: 500 11.5px/1 var(--mono); letter-spacing: .04em; color: var(--code-dim);
  background:
    radial-gradient(circle at 18px 18px, #2c403d 4.5px, transparent 5px),
    radial-gradient(circle at 34px 18px, #2c403d 4.5px, transparent 5px),
    radial-gradient(circle at 50px 18px, #2c403d 4.5px, transparent 5px),
    var(--code-bar);
  border-bottom: 1px solid var(--code-line); border-radius: 4px 12px 0 0;
}
pre code { background: none; padding: 0; border: 0; font-size: inherit; }
pre .c { color: var(--code-dim); }
pre .k { color: #7fd8e8; }
pre .e { color: #ff9c88; font-weight: 600; }
pre .g { color: #7fe6b4; }
.cap { font: 400 12.5px/1.6 var(--mono); color: var(--faint); margin: -10px 2px 24px; }
.cap code { font-size: 1em; }

/* ---------- diagram ---------- */
.diagram {
  margin: 34px 0 14px; border: 1px solid var(--line); border-radius: 4px; padding: 26px 18px 18px; overflow-x: auto;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 24px 24px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 24px 24px,
    var(--panel);
}
.diagram svg { display: block; width: 100%; min-width: 720px; height: auto; }
.diagram .node { fill: var(--bg); stroke: var(--line-2); stroke-width: 1; }
.diagram .node.hot { fill: var(--accent-soft); stroke: var(--accent); }
.diagram .halo { fill: none; stroke: var(--accent); stroke-opacity: .22; stroke-width: 6; }
.diagram .tag { font: 500 10px var(--mono); letter-spacing: .14em; fill: var(--faint); text-transform: uppercase; }
.diagram .t { font: 600 14px var(--mono); letter-spacing: -.02em; fill: var(--ink); }
.diagram .s { font: 400 11.5px var(--sans); fill: var(--muted); }
.diagram .wire { fill: none; stroke: color-mix(in srgb, var(--muted) 60%, transparent); stroke-width: 1.25; stroke-linecap: round; stroke-linejoin: round; }
.diagram .wire.ok { stroke: var(--good); }
.diagram .wire.no { stroke: var(--bad); }
.diagram .flow { fill: none; stroke: var(--accent); stroke-width: 1.75; stroke-linecap: round; stroke-dasharray: 1 15; animation: flow 1.6s linear infinite; }
.diagram .flow.ok { stroke: var(--good); }
.diagram .flow.no { stroke: var(--bad); }
@keyframes flow { to { stroke-dashoffset: -32; } }
.diagram .dot { fill: var(--bg); stroke: color-mix(in srgb, var(--muted) 80%, transparent); stroke-width: 1.25; }
.diagram .head { fill: none; stroke: color-mix(in srgb, var(--muted) 80%, transparent); stroke-width: 1.25; stroke-linecap: round; stroke-linejoin: round; }
.diagram .head.ok { stroke: var(--good); }
.diagram .head.no { stroke: var(--bad); }
.diagram .pill { stroke-width: 1; }
.diagram .pill.ok { fill: color-mix(in srgb, var(--good) 10%, transparent); stroke: var(--good); }
.diagram .pill.no { fill: color-mix(in srgb, var(--bad) 10%, transparent); stroke: var(--bad); }
.diagram .pt { font: 600 12.5px var(--mono); letter-spacing: -.01em; }
.diagram .pt.ok { fill: var(--good); }
.diagram .pt.no { fill: var(--bad); }

.diagram .lane { fill: color-mix(in srgb, var(--accent) 3%, transparent); stroke: var(--line); stroke-dasharray: 2 6; }
.diagram .lanet { font: 600 15px var(--mono); letter-spacing: .08em; fill: var(--accent); }
.diagram .lanes { font: 400 11.5px var(--sans); fill: var(--muted); }
.diagram .node.ghost { fill: transparent; stroke: var(--faint); stroke-dasharray: 4 5; }
.diagram .t.gt { fill: var(--muted); font-weight: 500; }
.diagram .node.back { fill: var(--panel); stroke: var(--line); }
.diagram .wl { font: 500 10px var(--mono); letter-spacing: .12em; fill: var(--accent); text-transform: uppercase; }

.diagram .rib { fill: none; stroke: var(--accent); stroke-width: 1.25; stroke-dasharray: 3 4; stroke-linecap: round; }
.diagram .rdot { fill: var(--accent); }

/* ---------- trust spine panels ---------- */
.spine { position: relative; margin: 18px 0; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); overflow: hidden; }
.spine:first-child { margin-top: 36px; }
.spine-head { display: flex; align-items: center; gap: 18px; padding: 22px 24px 18px; }
.spine-head .n { font: 500 12px/1 var(--mono); letter-spacing: .1em; color: var(--accent); border: 1px solid var(--line-2); border-radius: 3px; padding: 9px 10px; }
.spine-head .n::before { content: "0"; }
.spine-head .n.all::before { content: ""; }
.spine.overview { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); box-shadow: 0 30px 80px -50px var(--glow); }
.spine.overview + .spine:not(.overview) { margin-top: 30px; }
.spine-head h3 { font: 600 25px/1.15 var(--mono); letter-spacing: -.045em; margin: 0 0 5px; }
.spine-head .role { font: 500 12px/1.4 var(--mono); letter-spacing: .02em; color: var(--muted); margin: 0; }
.spine-head .tag {
  margin-left: auto; display: inline-flex; align-items: center; gap: 7px; white-space: nowrap;
  font: 500 11px/1 var(--mono); letter-spacing: .04em; color: var(--faint);
  padding: 7px 11px; border-radius: 999px; border: 1px solid var(--line);
}
.spine-head .tag::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--faint); }
.spine-head .tag.here { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 45%, transparent); background: color-mix(in srgb, var(--accent-2) 8%, transparent); }
.spine-head .tag.here::before { background: var(--accent-2); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-2) 25%, transparent); }
.spine .diagram { margin: 0; border: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); border-radius: 0; padding: 30px 18px 22px; }
.spine-real { padding: 22px 24px 6px; border-bottom: 1px solid var(--line); }
.spine-real .real-h { font: 500 10.5px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 14px; }
.spine-real pre { margin: 0 0 14px; box-shadow: none; }
.spine-real .cap { margin: 0 0 16px; font: 400 14px/1.7 var(--sans); color: var(--muted); max-width: 62em; }
.spine-foot { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; padding: 20px 24px 22px; }
.spine-foot p { margin: 0; font-size: 14.5px; line-height: 1.7; color: var(--muted); }
.spine-foot .guards { color: var(--ink); padding-left: 24px; border-left: 1px dashed var(--line-2); }
.spine-foot .guards b { display: block; font: 500 10.5px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 8px; }

/* ---------- story page ---------- */
.diagram.plot { padding: 22px 14px 10px; }
.diagram.plot svg { min-width: 680px; }
.plot .grid { stroke: var(--line); stroke-width: 1; }
.plot .axis { font: 500 11px var(--mono); fill: var(--faint); }
.plot .axis.dim { fill: var(--muted); }
.plot .area { fill: var(--accent); fill-opacity: .1; }
.plot .line { fill: none; stroke: var(--accent); stroke-width: 2.25; stroke-linejoin: round; stroke-linecap: round; }
.plot .pt { fill: var(--bg); stroke: var(--accent); stroke-width: 2; }
.plot .lab { font: 500 11.5px var(--mono); fill: var(--ink); letter-spacing: -.01em; }
.plot .bar { fill: var(--accent); fill-opacity: .75; }
.chapter { padding: 64px 0; }
.chapter p.quote { border-left: 2px solid var(--accent); padding: 4px 0 4px 20px; margin: 22px 0; color: var(--ink); font: 450 17.5px/1.7 var(--sans); }
q { quotes: none; font-style: normal; }
.chapter p.quote q { display: inline; }
p:not(.quote) q { color: var(--ink); font-weight: 500; }
p:not(.quote) q::before { content: "\201C"; }
p:not(.quote) q::after { content: "\201D"; }
:lang(ja) p:not(.quote) q::before { content: "\300C"; }
:lang(ja) p:not(.quote) q::after { content: "\300D"; }
.props.two .prop { grid-template-columns: 180px 1fr; }
.props.months .prop { grid-template-columns: 80px 1fr 1fr 1fr; }
ul.plain.hard li::before { content: "\2014"; color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, transparent); background: var(--accent-soft); }
.btn.ghost[href]::after { content: "→"; }

/* ---------- cards ---------- */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 34px 0 26px; }
.card {
  position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 24px 24px 22px;
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.card:hover { border-color: var(--line-2); transform: translateY(-2px); box-shadow: 0 18px 44px -30px var(--glow); }
.card .n { font: 500 12px/1 var(--mono); letter-spacing: .1em; color: var(--accent); margin-bottom: 18px; }
.card .n::before { content: "0"; }
.card h3 { font: 600 23px/1.2 var(--mono); letter-spacing: -.04em; margin-bottom: 6px; }
.card .role { font: 500 12px/1.5 var(--mono); letter-spacing: .02em; color: var(--muted); margin: 0 0 14px; }
.card p { font-size: 14.5px; line-height: 1.7; margin: 0; color: var(--muted); }
.card .guards { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--line-2); font-size: 14px; color: var(--ink); }
.card .guards b { display: block; font: 500 10.5px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent-2); margin-bottom: 8px; }
.subhead { font: 600 21px/1.3 var(--mono); letter-spacing: -.03em; margin: 44px 0 12px; }
.props { margin: 22px 0 18px; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); overflow: hidden; }
.prop { display: grid; grid-template-columns: 150px 1fr 1.25fr; gap: 22px; align-items: baseline; padding: 15px 22px; border-top: 1px solid var(--line); font-size: 14.5px; line-height: 1.6; }
.prop:first-child { border-top: 0; }
.prop.head { font: 500 10.5px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--faint); background: var(--bg-2); padding-top: 13px; padding-bottom: 13px; }
.prop code { justify-self: start; color: var(--accent); background: var(--accent-soft); border-color: transparent; font-size: 12.5px; padding: 3px 8px; }
.prop .stops { color: var(--ink); font-weight: 500; }
.prop .iff { color: var(--muted); }
.card .tag {
  position: absolute; top: 20px; right: 20px;
  display: inline-flex; align-items: center; gap: 7px;
  font: 500 11px/1 var(--mono); letter-spacing: .04em; color: var(--faint);
  padding: 6px 10px; border-radius: 999px; border: 1px solid var(--line);
}
.card .tag::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--faint); }
.card .tag.here { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent-2) 45%, transparent); background: color-mix(in srgb, var(--accent-2) 8%, transparent); }
.card .tag.here::before { background: var(--accent-2); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-2) 25%, transparent); }
.cards.three { grid-template-columns: repeat(3, 1fr); }
.cards.three .card h3 { font: 600 16px/1.4 var(--mono); letter-spacing: -.02em; margin-bottom: 10px; }
.cards.three .card h3::before { content: "› "; color: var(--accent); }

/* ---------- lists ---------- */
ul.plain { list-style: none; padding: 0; margin: 28px 0 0; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); overflow: hidden; }
ul.plain li { position: relative; padding: 17px 22px 17px 56px; border-top: 1px solid var(--line); font-size: 15.5px; color: var(--muted); }
ul.plain li:first-child { border-top: 0; }
ul.plain li::before {
  content: "×"; position: absolute; left: 20px; top: 19px; width: 20px; height: 20px; border-radius: 6px;
  display: grid; place-items: center; font: 600 12px/1 var(--mono);
  color: var(--bad); border: 1px solid color-mix(in srgb, var(--bad) 45%, transparent); background: color-mix(in srgb, var(--bad) 8%, transparent);
}
ul.plain li b { font-weight: 600; color: var(--ink); }

.callout { border: 1px solid var(--line); border-left: 2px solid var(--accent); border-radius: 0 12px 12px 0; padding: 16px 20px; margin: 28px 0; background: var(--panel); }
.callout p { margin: 0; font-size: 15.5px; color: var(--muted); }
.callout b { color: var(--ink); }

/* ---------- try ---------- */
.links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 30px; }
.links a {
  display: block; text-decoration: none; background: var(--panel); border: 1px solid var(--line);
  border-radius: 4px; padding: 22px 22px 20px; color: var(--ink);
  transition: border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.links a:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 18px 44px -30px var(--glow); }
.links b { display: block; font: 600 16px/1.3 var(--mono); letter-spacing: -.02em; margin-bottom: 8px; color: var(--accent); }
.links span { font-size: 14px; color: var(--muted); line-height: 1.55; display: block; }

/* Japanese: keep phrases together, loosen display tracking */
:lang(ja) h1, :lang(ja) h2, :lang(ja) .big, :lang(ja) .sub { word-break: auto-phrase; line-break: strict; }
:lang(ja) .hero h1, :lang(zh) .hero h1 { letter-spacing: -.03em; line-height: 1.4; font-size: clamp(28px, 3.1vw, 40px); }
:lang(ja) h2 { letter-spacing: -.01em; line-height: 1.35; }
:lang(ja) .num, :lang(ja) .eyebrow { letter-spacing: .06em; }

footer { padding: 40px 0 70px; color: var(--faint); font: 400 12.5px/1.7 var(--mono); }
footer p { margin: 0 0 8px; }

@media (max-width: 940px) {
  .facts { grid-template-columns: repeat(2, 1fr); }
  .cards.three { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .hero { padding: 40px 0; }
  section { padding: 58px 0; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cards, .cards.three, .links { grid-template-columns: 1fr; }
  pre { font-size: 12.5px; padding: 50px 16px 16px; }
  .card .tag { position: static; margin-top: 16px; }
  .spine-head { flex-wrap: wrap; gap: 14px; padding: 18px; }
  .spine-head .tag { margin-left: 0; }
  .spine-foot { grid-template-columns: 1fr; gap: 16px; padding: 18px; }
  .spine-foot .guards { padding-left: 0; border-left: 0; padding-top: 14px; border-top: 1px dashed var(--line-2); }
}

@media (prefers-reduced-motion: reduce) {
  .cursor, .diagram .flow { animation: none; }
  .diagram .flow { display: none; }
  html { scroll-behavior: auto; }
  .card, .links a, .btn { transition: none; }
}

/* Keep the navigation complete on narrow screens, rather than hiding links. */
.footer-end { display: flex; justify-content: space-between; gap: 24px; margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--line); }
.footer-end a { text-decoration: none; color: var(--ink); }
:lang(zh) { line-break: strict; }
:lang(zh) h2 { letter-spacing: -.01em; line-height: 1.5; }
@media (max-width: 1100px) {
  .header-inner { gap: 20px; padding: 0 22px; }
  .primary-nav a { padding: 0 10px; }
  .header-tools { gap: 8px; }
  .hero { column-gap: 32px; }
}
@media (max-width: 940px) {
  .header-inner { flex-wrap: wrap; gap: 0; padding-top: 12px; min-height: 0; }
  .brand { min-height: 48px; }
  .header-tools { order: 1; }
  .primary-nav { order: 2; width: 100%; margin-top: 10px; border-top: 1px solid var(--line); }
  .primary-nav a { flex: 1; padding: 0 12px; min-height: 44px; border-left: 0; }
  .primary-nav a:last-child { border-right: 0; }
  #main-content, section, #top { scroll-margin-top: 140px; }
}
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { max-width: 22em; font-size: 34px; }
  :lang(ja) .hero h1, :lang(zh) .hero h1 { font-size: 30px; }
  .hero .sub { max-width: none; }
  .hero-evidence { max-width: none; }
  .page-index > div { grid-template-columns: repeat(2, 1fr); }
  .page-index a { border-bottom: 1px solid var(--line); padding: 16px 14px; }
  .page-index a:nth-child(2) { border-right: 1px solid var(--line); }
  .page-index a:nth-last-child(-n+2) { border-bottom: 0; }
  .props.two .prop, .props.months .prop { grid-template-columns: 1fr; }
  .num { font-size: 10px; line-height: 1.7; }
}
@media (max-width: 440px) {
  .header-inner { padding-inline: 16px; }
  .brand { font-size: 17px; gap: 8px; }
  .brand img { width: 25px; height: 25px; }
  .locale-switcher a { min-width: 44px; padding-inline: 6px; }
  .header-tools { gap: 6px; }
  .theme-toggle { width: 44px; }
  .primary-nav a { padding-inline: 6px; font-size: 10px; }
  .primary-nav a span { display: none; }
  .hero h1 { font-size: 30px; }
  :lang(ja) .hero h1, :lang(zh) .hero h1 { font-size: 28px; }
  .wide, .wrap { padding-inline: 18px; }
  .facts div { padding: 20px 16px; }
  .facts b { font-size: 27px; }
  .facts span { font-size: 10.5px; }
  .panel-heading { padding: 14px 16px; }
}

/* Mobile reading: larger text and controls without a persistent two-row header. */
.diagram-hint, .mobile-label { display: none; }
@media (max-width: 760px) {
  .top { position: static; }
  #main-content, section { scroll-margin-top: 24px; }
  #top { scroll-margin-top: 0; }
  .primary-nav a { min-height: 48px; font-size: 12px; padding-inline: 6px; }
  .locale-switcher a { min-width: 44px; min-height: 44px; font-size: 12px; }
  .theme-toggle { width: 44px; height: 44px; }
  .hero { padding-block: 30px; }
  .eyebrow { font-size: 11px; margin-bottom: 20px; }
  .hero h1 { margin-bottom: 20px; }
  .hero .sub { font-size: 16px; line-height: 1.85; margin-bottom: 24px; }
  .btn { min-height: 48px; font-size: 13px; }
  .facts span { font-size: 13px; line-height: 1.75; }
  .panel-heading, .panel-heading > span:last-child { font-size: 11px; }
  .asof { font-size: 12px; line-height: 1.8; }
  .asof, .cap, footer { color: var(--muted); }
  .page-index a { min-height: 52px; font-size: 12px; gap: 10px; }
  .num { font-size: 12px; }
  .diagram-hint { display: block; position: sticky; left: 0; width: fit-content; max-width: 100%; margin: 0 0 16px; color: var(--muted); font: 400 12px/1.7 var(--mono); }
  .mobile-label { display: block; margin: 6px 0 4px; font: 500 12px/1.6 var(--mono); color: var(--accent); }
  .prop { grid-template-columns: 1fr; gap: 10px; padding: 16px 18px; }
  .prop.head { display: none; }
  .prop code { font-size: 14px; }
  pre { font-size: 13px; }
}
@media (max-width: 440px) {
  .cta { display: grid; grid-template-columns: 1fr; gap: 10px; }
  .cta .btn { width: 100%; }
  .facts { grid-template-columns: 1fr; }
  .facts > div { display: grid; grid-template-columns: 84px minmax(0, 1fr); align-items: start; gap: 16px; padding: 18px 16px; }
  .facts b { font-size: 26px; margin: 0; }
  .story-page .facts > div { grid-template-columns: 96px minmax(0, 1fr); }
  .story-page .facts b { font-size: 24px; }
}
@media (max-width: 360px) {
  .primary-nav { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .primary-nav a { grid-column: span 2; }
  .primary-nav a:nth-child(-n+2) { grid-column: span 3; }
}