@font-face {
  font-family: "Portfolio Noto SC";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/assets/typography/portfolio-noto-400.woff2") format("woff2");
}
@font-face {
  font-family: "Portfolio Noto SC";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/assets/typography/portfolio-noto-500.woff2") format("woff2");
}
@font-face {
  font-family: "Portfolio Noto SC";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/assets/typography/portfolio-noto-700.woff2") format("woff2");
}

:root {
  color-scheme: light;
  --bg: #f7f7f4;
  --surface: #f0f0ed;
  --ink: #151515;
  --muted: #64686d;
  --line: #dadad7;
  --blue: #3157f6;
  --blue-hover: #2545d1;
  --blue-soft: #eef2ff;
  --night: #111214;
  --width: 1280px;
  --reading: 760px;
  --gutter: clamp(24px, 5.55vw, 80px);
  --section-space: clamp(110px, 9.4vw, 140px);
  --layout-gap: clamp(28px, 4.5vw, 64px);
  --nav-height: 74px;
}

* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--nav-height) + 24px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Portfolio Noto SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
::selection { background: #cfdcfe; color: #151515; }
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }
h1, h2, h3, h4 { font-weight: 500; text-wrap: balance; }
h1, h2 { letter-spacing: -.025em; }
p { text-wrap: pretty; }
p + p { margin-top: 18px; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 5px; }
button, summary, a { -webkit-tap-highlight-color: transparent; }
button, input, textarea, select { font: inherit; }
img, svg { display: block; max-width: 100%; }
img { height: auto; }
ol, ul { padding: 0; margin: 0; list-style: none; }
strong { font-weight: 700; }
small { font-size: 12px; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 5px; }
.wrap { width: min(calc(100% - var(--gutter) * 2), var(--width)); margin-inline: auto; }
.wrap > *, [class$="-layout"] > *, [class$="-grid"] > *, .split-head > * { min-width: 0; }
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 40;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--bg);
  transform: translateY(-160%);
}
.skip-link:focus { transform: none; }

/* Navigation stays compact; the native details menu works without scripts. */
.site-header { position: sticky; z-index: 20; top: 0; background: var(--bg); border-bottom: 1px solid var(--line); }
.nav { min-height: var(--nav-height); display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { font-size: 14px; font-weight: 500; }
.brand span { color: var(--muted); font-weight: 400; }
.back { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-size: 14px; }
.nav-links { display: flex; align-items: center; gap: 32px; font-size: 13px; }
.nav-links > a { padding-block: 12px; }
.chapter-menu { position: relative; }
.chapter-menu > summary { min-height: 44px; display: flex; align-items: center; gap: 14px; cursor: pointer; list-style: none; }
.chapter-menu > summary::-webkit-details-marker { display: none; }
.chapter-menu > summary > span { display: none; }
.chapter-menu > summary::after { content: "+"; color: var(--muted); font-size: 19px; line-height: 1; }
.chapter-menu[open] > summary::after { content: "−"; }
.chapter-list {
  position: absolute;
  top: calc(100% + 15px);
  right: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 24px;
  width: min(600px, calc(100vw - 48px));
  max-height: calc(100dvh - var(--nav-height) - 48px);
  padding: 18px 24px;
  overflow-y: auto;
  background: var(--bg);
  border: 1px solid var(--line);
}
.chapter-list a { display: block; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.chapter-list a:last-child { border-bottom: 0; }
.chapter-list a > span { display: inline-block; width: 32px; color: var(--muted); }

/* Section rhythm is structural in this round: no decorative effects or motion. */
.case-section { padding-block: var(--section-space); }
.section-label { margin-bottom: 28px; color: var(--muted); font-size: 13px; font-weight: 500; letter-spacing: .1em; line-height: 1.6; }
.section-head { margin-bottom: 64px; }
.section-title, .case-section h2 { max-width: 1000px; font-size: clamp(32px, 3.75vw, 54px); line-height: 1.35; }
.section-title + .intro, .section-head > .intro { margin-top: 28px; }
.intro { max-width: var(--reading); color: var(--muted); font-size: 18px; line-height: 1.9; }
.intro strong { color: var(--ink); font-weight: 500; }
.split-head { display: grid; grid-template-columns: 1.15fr .85fr; gap: var(--layout-gap); align-items: start; }
.split-head .intro { margin-top: 9px; }
.case-section h3 { font-size: clamp(23px, 2.1vw, 30px); line-height: 1.45; }
.case-section h4 { font-size: 18px; line-height: 1.6; }
.section-note { max-width: var(--reading); margin-top: 32px; color: var(--muted); font-size: 15px; }
.phase-note { color: var(--muted); font-size: 12px; line-height: 1.8; }
.hero > .wrap > .phase-note { margin-top: 22px; }
.diagram-label, .example-note, .source-citation, .validation-source { color: var(--muted); font-size: 12px; line-height: 1.85; }
.diagram-label { margin-bottom: 16px; letter-spacing: .06em; }
.diagram-label > span { margin-left: 20px; letter-spacing: 0; }
.example-note, .source-citation { margin-top: 20px; }
.validation-source { margin-bottom: 32px; font-size: 14px; }
.problem-statement { margin-top: 52px; }
.problem-statement > p:first-child { color: var(--muted); font-size: 16px; }
.problem-statement .conclusion { margin-top: 22px; }
.inline-principle { display: flex; flex-wrap: wrap; gap: 8px 28px; color: var(--ink) !important; }
.contact-copy, .conclusion-sub { margin-top: 26px; color: var(--muted); font-size: 15px; }
.conclusion { max-width: 1000px; margin-top: 64px; padding-top: 34px; border-top: 1px solid var(--line); font-size: clamp(24px, 2.2vw, 32px); line-height: 1.6; letter-spacing: -.015em; }
.conclusion p + p { margin-top: 14px; }
.conclusion small { display: block; color: var(--muted); font-size: 15px; letter-spacing: 0; }
.dark {
  color-scheme: dark;
  --bg: #111214;
  --surface: #191b1e;
  --ink: #f2f3f1;
  --muted: #adb1b8;
  --line: #383b40;
  --blue: #92adff;
  background: var(--bg);
  color: var(--ink);
}
.dark .intro { line-height: 1.95; }

.hero { padding-top: clamp(56px, 4.4vw, 72px); padding-bottom: 0; }
.hero .section-label { margin-bottom: 22px; }
.project-name { margin-bottom: 22px; color: var(--muted); font-size: 12px; font-weight: 500; letter-spacing: .07em; }
.project-name > span { display: block; margin-top: 15px; color: var(--ink); font-size: 20px; letter-spacing: 0; }
.hero h1 { max-width: 1130px; font-size: clamp(44px, 5.55vw, 80px); font-weight: 500; line-height: 1.23; letter-spacing: -.035em; }
.hero-intro { max-width: 780px; margin-top: 26px; color: var(--muted); font-size: 18px; line-height: 1.95; }
.meta { display: grid; grid-template-columns: 1.08fr .75fr 1.12fr .8fr; gap: 30px; margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); }
.meta dl { min-width: 0; }
.meta dt { margin-bottom: 9px; color: var(--muted); font-size: 11px; letter-spacing: .09em; }
.meta dd { font-size: 13px; line-height: 1.8; }
.hero-visual { margin-top: 38px; }
.hero-details { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; width: 76%; margin: 28px auto 0; }
.hero-details .placeholder-body { min-height: 190px; }
.hero-details .placeholder-body h3 { font-size: 22px; }
.challenge { padding-block: 112px 40px; }
.challenge > span { display: block; margin-bottom: 24px; color: var(--muted); font-size: 12px; letter-spacing: .09em; }
.challenge > p[lang="en"] { max-width: 890px; font-size: clamp(25px, 2.5vw, 36px); line-height: 1.5; letter-spacing: -.02em; }
.challenge > p:not([lang]) { margin-top: 20px; color: var(--muted); font-size: 18px; }
.challenge .wrap { display: grid; grid-template-columns: .42fr 1fr; gap: 40px; align-items: start; }
.challenge .section-label { margin-top: 10px; }
.challenge blockquote { max-width: 850px; }
.challenge blockquote > p:first-child { font-size: clamp(25px, 2.5vw, 36px); line-height: 1.5; letter-spacing: -.02em; }
.challenge blockquote > p + p { margin-top: 20px; color: var(--muted); font-size: 18px; }

/* Genuine screen locations are reserved explicitly, not imitated with fake UI. */
.media-placeholder { min-width: 0; border: 1px solid var(--line); border-radius: 4px; background: var(--surface); }
.placeholder-top { display: flex; align-items: center; gap: 6px; min-height: 34px; padding: 9px 16px; border-bottom: 1px solid var(--line); }
.placeholder-top > span { flex: 0 0 auto; color: var(--muted); font-size: 7px; line-height: 1; letter-spacing: 3px; white-space: nowrap; }
.placeholder-top small { margin-left: 10px; color: var(--muted); font-size: 10px; letter-spacing: .02em; }
.placeholder-body { display: flex; flex-direction: column; justify-content: center; align-items: center; min-height: 280px; padding: 42px 28px; text-align: center; }
.placeholder-index { margin-bottom: 20px; color: var(--muted); font-size: 12px; letter-spacing: .08em; }
.placeholder-body h3 { max-width: 650px; font-size: clamp(24px, 2.45vw, 34px); line-height: 1.45; }
.placeholder-body > p { max-width: 580px; margin-top: 16px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.placeholder-detail { max-width: 640px; margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.9; }
.media-placeholder figcaption { padding: 14px 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.7; }
.hero-visual > .media-placeholder .placeholder-body { min-height: 430px; }
.placeholder-group { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }

.broken-flow { margin-top: 8px; }
.broken-flow ol, .architecture-flow ol { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); }
.broken-flow li { position: relative; min-height: 174px; padding: 24px 18px 54px 0; border-top: 1px solid var(--line); }
.broken-flow li + li { padding-left: 22px; }
.broken-flow li + li::before { content: "→"; position: absolute; top: 54px; left: -11px; color: var(--muted); }
.broken-flow small, .architecture-flow small { display: block; color: var(--muted); font-size: 11px; letter-spacing: .05em; }
.broken-flow strong { display: block; margin-top: 10px; font-size: 17px; font-weight: 500; }
.broken-flow p { margin-top: 6px; color: var(--muted); font-size: 13px; }
.break-label { display: inline-block; margin-top: 24px; padding-top: 6px; border-top: 1px dashed var(--muted); color: var(--ink); font-size: 12px; }
.tools-line { display: flex; flex-wrap: wrap; gap: 14px 28px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.tools-line span:first-child { margin-right: auto; }

.problem-layout { display: grid; grid-template-columns: 1fr 1fr; gap: var(--layout-gap); align-items: start; }
.problem-layout .intro { margin-top: 30px; }
.editorial-rows li { display: grid; grid-template-columns: 42px 1fr; gap: 10px; padding: 25px 0; border-top: 1px solid var(--line); }
.editorial-rows li:last-child { border-bottom: 1px solid var(--line); }
.editorial-rows .row-number, .editorial-rows li > span:first-child { color: var(--muted); font-size: 12px; padding-top: 6px; }
.editorial-rows li h3 { font-size: 23px; }
.editorial-rows li p { margin-top: 10px; color: var(--muted); font-size: 15px; }
.judgement-chain { width: min(100%, 920px); margin: 56px 0 0 auto; }
.chain-group-label { margin-bottom: 18px; color: var(--muted); font-size: 12px; letter-spacing: .08em; }
.judgement-chain ol { border-top: 1px solid var(--line); }
.judgement-chain li { display: grid; grid-template-columns: 44px 1fr 1fr; gap: 22px; align-items: center; min-height: 86px; padding: 22px 20px; border-bottom: 1px solid var(--line); }
.judgement-chain li > span:first-child { color: var(--muted); font-size: 12px; }
.judgement-chain strong { font-size: 17px; font-weight: 500; letter-spacing: .02em; }
.judgement-chain h3 { font-size: 18px; letter-spacing: .02em; line-height: 1.5; }
.judgement-chain .human-step h3 { color: var(--blue); }
.judgement-chain p { font-size: 18px; }
.judgement-chain .human-step { margin-top: 30px; border: 1px solid var(--blue); }
.human-step strong { color: var(--blue); }
.human-step small { display: block; margin-bottom: 6px; color: var(--muted); font-size: 10px; letter-spacing: .07em; }

.strategy-list li { display: grid; grid-template-columns: 50px 1fr 1.25fr; column-gap: 28px; padding: 32px 0; border-top: 1px solid var(--line); }
.strategy-list li:last-child { border-bottom: 1px solid var(--line); }
.strategy-list .row-number, .strategy-list li > span:first-child { color: var(--muted); font-size: 12px; }
.strategy-list li > strong { font-size: 15px; font-weight: 500; letter-spacing: .04em; }
.strategy-list li h3 { margin-top: -6px; font-size: 26px; }
.strategy-list li p { margin-top: 12px; color: var(--muted); font-size: 15px; }
.strategy-list .boundary-inline { display: block; margin-top: 14px; color: var(--ink); font-size: 14px; }
.principle-strip { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 24px 40px; margin-top: 48px; padding-block: 26px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.principle-strip small { color: var(--muted); font-size: 11px; letter-spacing: .06em; }
.principle-strip > span { color: var(--muted); font-size: 11px; letter-spacing: .06em; }
.principle-strip p { font-size: 20px; }
.principle-strip p + p { margin-top: 8px; color: var(--muted); font-size: 15px; }
.architecture-flow li { position: relative; padding: 23px 22px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.architecture-flow li:first-child { padding-left: 0; }
.architecture-flow li + li { border-left: 1px solid var(--line); }
.architecture-flow strong { display: block; margin-top: 18px; font-size: 18px; line-height: 1.7; font-weight: 500; }
.architecture-flow .flow-number { display: block; margin-bottom: 17px; color: var(--muted); font-size: 12px; }
.architecture-flow h3 { margin-top: 18px; font-size: 18px; line-height: 1.7; }
.architecture-flow p { margin-top: 22px; color: var(--muted); font-size: 13px; line-height: 1.95; }

.journey-strip ol { display: flex; flex-wrap: wrap; align-items: center; gap: 18px 0; padding-block: 21px; border-block: 1px solid var(--line); }
.journey-strip li { display: flex; align-items: center; font-size: 12px; color: var(--muted); letter-spacing: .045em; }
.journey-strip li:not(:last-child)::after { content: "→"; margin-inline: 28px; font-size: 16px; color: var(--muted); }
.journey-strip li.important, .journey-strip li.is-key, .journey-strip li.active, .journey-strip li strong { color: var(--blue); font-weight: 500; }
.journey-visuals { display: grid; grid-template-columns: .85fr 1.35fr .85fr; align-items: center; gap: 22px; margin-top: 44px; }
.journey-visuals .placeholder-body { min-height: 300px; padding-inline: 18px; }
.journey-visuals > :nth-child(2) .placeholder-body { min-height: 390px; }
.journey-visuals h3 { font-size: 23px; }
.journey-visuals > :nth-child(2) h3 { font-size: 28px; }
.research-layout { display: grid; grid-template-columns: .28fr .72fr; gap: 24px; }
.research-layout .placeholder-body { min-height: 450px; }
.research-layout > :first-child h3 { font-size: 24px; }
.reading-order { margin: 32px 0 0; }
.reading-order ol { display: flex; gap: 22px; border-top: 1px solid var(--line); }
.reading-order li { flex: 1; min-width: 0; padding-top: 18px; }
.reading-order small, .reading-order strong { display: block; }
.reading-order small { color: var(--muted); font-size: 11px; }
.reading-order strong { margin-top: 6px; font-size: 14px; font-weight: 500; }
.comparison { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 48px; padding-block: 30px; border-block: 1px solid var(--line); }
.comparison > * { min-width: 0; }
.comparison small { display: block; margin-bottom: 14px; color: var(--muted); font-size: 12px; letter-spacing: .04em; }
.comparison > div > span { display: block; margin-bottom: 14px; color: var(--muted); font-size: 12px; letter-spacing: .03em; }
.comparison b { margin-left: 12px; color: var(--ink); font-size: 21px; font-weight: 500; }
.comparison b:first-child { margin-left: 0; }
.comparison h3 { margin-bottom: 14px; font-size: 23px; }
.comparison strong { font-size: 18px; font-weight: 500; }
.comparison p { color: var(--muted); font-size: 15px; }
.comparison strong + p { margin-top: 10px; }
.comparison .comparison-value { color: var(--ink); font-size: 24px; }
.comparison .context-counts { display: flex; flex-wrap: wrap; gap: 9px 20px; margin-top: 12px; color: var(--ink); font-size: 14px; }

.evidence-layout { display: grid; grid-template-columns: 1.4fr .7fr; gap: 42px; align-items: start; }
.evidence-layout .placeholder-body { min-height: 450px; }
.concept-tree { padding-top: 10px; }
.concept-tree small { display: block; color: var(--muted); font-size: 11px; letter-spacing: .05em; }
.concept-tree span, .unknown-note > span { display: block; color: var(--muted); font-size: 11px; letter-spacing: .05em; }
.assessment { padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.assessment h3 { margin-top: 12px; font-size: 30px; }
.assessment p { margin-top: 12px; color: var(--muted); font-size: 14px; }
.assessment strong { display: block; margin-top: 8px; font-size: 26px; font-weight: 500; }
.reason-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 24px; }
.reason-pair > * { min-width: 0; }
.reason-pair strong { display: block; margin-block: 8px 15px; font-size: 15px; font-weight: 500; line-height: 1.8; }
.reason-pair p { margin-top: 8px; color: var(--muted); font-size: 13px; }
.reason-pair h3 { margin-top: 12px; font-size: 22px; }
.reason-pair p + span { margin-top: 15px; }
.unknown-note { margin-top: 28px; padding-top: 22px; border-top: 1px solid var(--line); }
.unknown-note small { color: var(--blue); }
.unknown-note h3, .unknown-note strong { display: block; margin-top: 8px; font-size: 18px; font-weight: 500; }
.unknown-note p { margin-top: 12px; color: var(--muted); font-size: 14px; }
.semantics { margin-top: 42px; }
.semantics > div, .semantics li { display: grid; grid-template-columns: .85fr 1.15fr; gap: 32px; padding: 19px 0; border-bottom: 1px solid var(--line); }
.semantics > div { grid-template-columns: 120px .8fr 1.2fr; gap: 24px; }
.semantics > div > span { color: var(--muted); font-size: 12px; }
.semantics s { color: var(--muted); text-decoration-color: var(--muted); }
.trust-statement { margin-top: 48px; }
.trust-statement .comparison { margin-top: 24px; }
.semantics p { font-size: 15px; }
.semantics p + p { margin-top: 0; }
.semantics .incorrect { color: var(--muted); }
.semantics small { display: inline-block; margin-right: 16px; color: var(--muted); font-size: 11px; }

.review-layout { display: grid; grid-template-columns: .58fr .42fr; gap: 28px; }
.review-layout .placeholder-body { min-height: 420px; }
.state-flow { margin-top: 36px; }
.state-flow ol { display: flex; flex-wrap: wrap; align-items: center; gap: 18px 0; }
.state-flow li { display: flex; align-items: center; font-size: 13px; letter-spacing: .04em; }
.state-flow li small { margin-right: 12px; color: var(--muted); font-size: 10px; }
.state-flow li:not(:last-child)::after { content: "→"; margin-inline: 30px; color: var(--muted); }
.boundary-note { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 12px 40px; margin-top: 36px; padding-block: 24px; border-block: 1px solid var(--line); }
.boundary-note strong { font-size: clamp(22px, 2vw, 28px); font-weight: 500; letter-spacing: -.015em; }
.boundary-note p { color: var(--muted); font-size: 15px; }
.boundary-note p + p { margin-top: 0; }
.leads-layout { display: grid; grid-template-columns: .62fr .38fr; gap: 28px; }
.leads-layout .placeholder-body { min-height: 420px; }
.drawer-order { margin-top: 30px; }
.drawer-order ol { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px 30px; }
.drawer-order li { padding-top: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; letter-spacing: .03em; }
.runs-layout { display: grid; grid-template-columns: .34fr .66fr; gap: 38px; }
.run-history > p, .run-timeline > p { margin-bottom: 24px; color: var(--muted); font-size: 12px; letter-spacing: .06em; }
.run-history li { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px 16px; padding-block: 23px; border-top: 1px solid var(--line); }
.run-history li:last-child { border-bottom: 1px solid var(--line); }
.run-history strong { font-size: 19px; font-weight: 500; }
.run-history span, .run-history small { color: var(--muted); font-size: 13px; }
.run-history li p { width: 100%; color: var(--muted); font-size: 13px; }
.run-history .current strong, .run-history [aria-current="true"] strong { color: var(--blue); }
.run-timeline li { display: grid; grid-template-columns: 35px 1fr 1.35fr; gap: 18px; align-items: baseline; padding: 20px 0; border-top: 1px solid var(--line); }
.run-timeline li:last-child { border-bottom: 1px solid var(--line); }
.run-timeline li > span:first-child { color: var(--muted); font-size: 12px; }
.run-timeline strong { font-size: 16px; font-weight: 500; }
.run-timeline p { color: var(--muted); font-size: 14px; }
.run-timeline small { display: block; color: var(--muted); font-size: 11px; }
.retry-reserved { display: grid; grid-template-columns: 1fr 1fr; gap: 38px; margin-top: 34px; padding-block: 24px; border-block: 1px dashed var(--line); }
.retry-reserved > div > span { color: var(--muted); font-size: 11px; letter-spacing: .05em; }
.retry-reserved small { color: var(--muted); font-size: 12px; }
.retry-reserved h3 { margin-top: 8px; font-size: 24px; }
.retry-reserved p { max-width: var(--reading); margin-top: 12px; color: var(--muted); font-size: 14px; }
.runs-layout + .placeholder-group { margin-top: 38px; }

.system-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 70px; align-items: start; }
.system-layers li { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center; padding: 23px 0; border-top: 1px solid var(--line); }
.system-layers li { grid-template-columns: .7fr 1.3fr; gap: 6px 24px; }
.system-layers li > span { color: var(--muted); font-size: 11px; letter-spacing: .05em; }
.system-layers h3 { font-size: 20px; line-height: 1.6; }
.system-layers li > p { grid-column: 2; color: var(--muted); font-size: 12px; }
.system-layers li:last-child { border-bottom: 1px solid var(--line); }
.system-layers strong { font-size: 16px; font-weight: 500; letter-spacing: .04em; }
.system-layers p { font-size: 16px; }
.system-layers small { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; letter-spacing: 0; }
.system-explanation h3 { margin-bottom: 24px; }
.system-explanation > span { display: block; margin-bottom: 24px; color: var(--muted); font-size: 12px; letter-spacing: .05em; line-height: 1.9; }
.system-explanation .comparison { gap: 24px; margin-top: 28px; }
.system-explanation p { color: var(--muted); font-size: 16px; }
.system-explanation dl > div { display: grid; grid-template-columns: 112px 1fr; gap: 20px; margin-top: 18px; font-size: 14px; }
.system-explanation dd { color: var(--muted); }
.metrics { display: grid; grid-template-columns: 1fr 1fr 1.5fr 1fr; gap: 28px; align-items: end; margin-top: 60px; padding-top: 30px; border-top: 1px solid var(--line); }
.metrics > * { min-width: 0; }
.metrics strong { display: block; font-size: 38px; font-weight: 500; line-height: 1.25; letter-spacing: -.02em; }
.metrics .important strong, .metrics .first strong { color: var(--blue); font-size: clamp(48px, 4.9vw, 70px); white-space: nowrap; }
.metrics span, .metrics small, .metrics p { display: block; margin-top: 12px; color: var(--muted); font-size: 12px; line-height: 1.8; }
.engineering-principles { display: flex; flex-wrap: wrap; gap: 16px 36px; margin-top: 46px; color: var(--muted); font-size: 12px; letter-spacing: .06em; }
.scope-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--line); }
.scope-layout h3 { margin-bottom: 18px; font-size: 25px; }
.scope-layout p, .scope-layout li { color: var(--muted); font-size: 14px; line-height: 1.95; }
.scope-layout ul { display: flex; flex-wrap: wrap; gap: 4px 22px; }
.scope-layout small { display: block; margin-bottom: 14px; color: var(--muted); font-size: 11px; letter-spacing: .08em; }
.scope-layout strong { color: var(--ink); font-weight: 500; }
.current-scope { margin-top: 54px; padding-top: 30px; border-top: 1px solid var(--line); }
.current-scope > h3 { color: var(--muted); font-size: 12px; letter-spacing: .06em; }
.current-scope .scope-layout { margin-top: 24px; padding-top: 0; border-top: 0; }
.scope-layout > div > span { display: block; margin-bottom: 16px; color: var(--muted); font-size: 11px; letter-spacing: .035em; }

.validation-grid { display: grid; grid-template-columns: 1.2fr .8fr; grid-template-areas: "workflow database" "refresh interface"; column-gap: 60px; row-gap: 36px; }
.validation-workflow { grid-area: workflow; }
.validation-refresh { grid-area: refresh; }
.validation-database { grid-area: database; }
.validation-interface { grid-area: interface; }
.validation-grid > div, .validation-grid > article { min-width: 0; padding-top: 27px; border-top: 1px solid var(--line); }
.validation-grid h3 { margin-bottom: 26px; font-size: 24px; }
.validation-grid > article > span { display: block; margin-bottom: 20px; color: var(--muted); font-size: 11px; letter-spacing: .06em; }
.validation-workflow h3 small { margin-left: 12px; color: var(--blue); font-size: 12px; }
.validation-database h3 { font-size: 17px; }
.validation-grid + .media-placeholder { margin-top: 46px; }
.validation-grid p, .validation-grid li { font-size: 15px; }
.validation-grid .section-label { margin-bottom: 18px; font-size: 11px; }
.validation-workflow .journey-strip ol { border: 0; padding: 0; }
.validation-workflow .journey-strip li { font-size: 10px; }
.validation-workflow .journey-strip li:not(:last-child)::after { margin-inline: 12px; font-size: 12px; }
.validation-grid .verified, .validation-grid .result { display: block; margin-top: 24px; color: var(--blue); font-size: 14px; font-weight: 500; }
.validation-grid .phase-note { margin-top: 18px; color: var(--muted); font-size: 12px; }
.validation-refresh .state-list { display: flex; flex-wrap: wrap; gap: 8px 20px; color: var(--muted); font-size: 13px; }
.validation-refresh .refresh-step { margin-block: 16px; font-size: 12px; color: var(--muted); }
.validation-database .test-count { display: block; margin-bottom: 16px; color: var(--blue); font-size: clamp(52px, 5vw, 72px); font-weight: 500; line-height: 1.2; letter-spacing: -.035em; }
.validation-database ul, .validation-interface ul { margin-top: 20px; }
.validation-database li, .validation-interface li { margin-top: 7px; color: var(--muted); font-size: 14px; }
.validation-interface .viewport-list { margin-bottom: 22px; color: var(--ink); font-size: 18px; line-height: 1.85; }
.verified-scope { margin-top: 42px; padding-top: 26px; border-top: 1px solid var(--line); }
.verified-scope small { color: var(--muted); font-size: 12px; letter-spacing: .05em; }
.verified-scope p { max-width: var(--reading); margin-top: 12px; color: var(--muted); font-size: 14px; }

.reflection { padding-block: 150px 160px; }
.reflection .section-title { max-width: 1010px; }
.reflection-copy { max-width: var(--reading); margin-top: 48px; color: var(--muted); font-size: 18px; line-height: 2; }
.reflection-copy p + p { margin-top: 28px; }
.reflection-copy strong { color: var(--ink); font-weight: 500; }
.reflection-pillars { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 34px; margin-top: 72px; padding-top: 26px; border-top: 1px solid var(--line); }
.reflection-pillars small { color: var(--muted); font-size: 11px; letter-spacing: .06em; }
.reflection-pillars span { color: var(--muted); font-size: 11px; letter-spacing: .06em; }
.reflection-pillars p { margin-top: 14px; font-size: 15px; }
.reflection .conclusion { margin-top: 86px; max-width: 960px; padding-top: 0; border-top: 0; font-size: clamp(28px, 2.7vw, 39px); line-height: 1.65; }
.next-project { padding-block: 80px; }
.next-inner { display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.next-inner > * { min-width: 0; }
.next-project .section-label { margin-bottom: 18px; }
.next-project .project-type { margin-bottom: 10px; color: var(--muted); font-size: 13px; }
.next-project .next-type { margin-top: 0; margin-bottom: 12px; font-size: 12px; letter-spacing: .035em; }
.next-project h2 { max-width: 780px; font-size: clamp(30px, 3vw, 42px); line-height: 1.4; }
.next-project p { max-width: 660px; margin-top: 18px; color: var(--muted); font-size: 15px; }
.next-project .next-link { display: inline-flex; align-items: center; justify-content: space-between; gap: 32px; min-height: 48px; margin-top: 28px; border-bottom: 1px solid var(--muted); font-size: 14px; }
.next-project .next-visual { width: 28%; flex-shrink: 0; }
.site-footer { padding-block: 24px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); }
.site-footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; }

@media (max-width: 1100px) {
  .architecture-flow ol, .broken-flow ol { grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 24px; }
  .architecture-flow li:nth-child(4) { padding-left: 0; border-left: 0; }
  .broken-flow li:nth-child(4) { padding-left: 0; }
  .broken-flow li:nth-child(4)::before { content: none; }
  .journey-strip li:not(:last-child)::after { margin-inline: 20px; }
  .journey-visuals { gap: 16px; }
  .journey-visuals .placeholder-body { padding-inline: 14px; }
  .journey-visuals .placeholder-body h3 { font-size: 21px; }
  .system-layout { gap: 38px; }
  .evidence-layout { grid-template-columns: 1.15fr 1fr; gap: 30px; }
  .run-timeline li { grid-template-columns: 30px 1fr; }
  .run-timeline li > p { grid-column: 2; margin-top: -10px; }
}

@media (max-width: 900px) {
  :root { --gutter: 36px; --section-space: 96px; --layout-gap: 38px; }
  .hero h1 { font-size: clamp(44px, 7.5vw, 67px); }
  .hero .meta { grid-template-columns: 1fr 1fr; row-gap: 24px; }
  .split-head, .problem-layout, .evidence-layout, .system-layout { grid-template-columns: 1fr; }
  .section-head { margin-bottom: 46px; }
  .split-head { gap: 28px; }
  .split-head .intro { margin-top: 0; }
  .section-title, .case-section h2 { max-width: 780px; font-size: clamp(32px, 5.6vw, 48px); }
  .hero-details { width: 92%; }
  .challenge .wrap { grid-template-columns: 1fr; gap: 18px; }
  .challenge .section-label { margin: 0; }
  .judgement-chain { margin-top: 40px; }
  .strategy-list li { grid-template-columns: 36px .9fr 1.4fr; column-gap: 20px; }
  .strategy-list li > strong { font-size: 12px; }
  .strategy-list li h3 { font-size: 24px; }
  .journey-visuals { grid-template-columns: 1fr 1fr; }
  .journey-visuals > :nth-child(2) { grid-column: 1 / -1; grid-row: 1; }
  .journey-visuals > :nth-child(2) .placeholder-body { min-height: 360px; }
  .journey-visuals .placeholder-body { min-height: 260px; }
  .research-layout { grid-template-columns: .34fr .66fr; gap: 20px; }
  .research-layout .placeholder-body { min-height: 380px; padding-inline: 18px; }
  .reading-order ol { flex-wrap: wrap; gap: 22px 28px; }
  .reading-order li { flex: 1 1 140px; }
  .reason-pair { gap: 38px; }
  .review-layout, .leads-layout { gap: 20px; }
  .review-layout .placeholder-body, .leads-layout .placeholder-body { min-height: 370px; padding-inline: 18px; }
  .runs-layout { grid-template-columns: .34fr .66fr; gap: 28px; }
  .metrics { grid-template-columns: 1fr 1fr; gap: 36px; }
  .metrics .important { grid-column: 1; grid-row: 1; }
  .scope-layout { gap: 36px; }
  .validation-grid { column-gap: 36px; }
  .reflection { padding-block: 118px 130px; }
  .reflection-pillars { grid-template-columns: 1fr 1fr; row-gap: 30px; }
  .next-inner { gap: 30px; }
}

@media (max-width: 600px) {
  :root { --gutter: 24px; --section-space: 76px; --nav-height: 64px; --layout-gap: 28px; }
  body { font-size: 15px; }
  .nav { gap: 12px; }
  .brand { max-width: 134px; font-size: 12px; line-height: 1.6; }
  .brand span { display: block; }
  .brand > span[aria-hidden] { display: inline; }
  .nav-links { gap: 16px; font-size: 12px; }
  .nav-links > a:not(.back):not(.return-link) { display: none; }
  .back { font-size: 12px; gap: 5px; }
  .chapter-menu > summary { gap: 8px; }
  .chapter-list { position: fixed; top: var(--nav-height); right: 16px; left: 16px; width: auto; max-height: calc(100dvh - var(--nav-height) - 24px); grid-template-columns: 1fr; padding: 10px 20px; }
  .chapter-list a { padding: 11px 0; }
  .case-section { padding-block: var(--section-space); }
  .section-label { margin-bottom: 20px; font-size: 11px; letter-spacing: .08em; }
  .section-head { margin-bottom: 34px; }
  .section-title, .case-section h2 { font-size: clamp(30px, 8.2vw, 40px); line-height: 1.42; letter-spacing: -.025em; }
  .intro { font-size: 16px; line-height: 1.95; }
  .section-title + .intro, .section-head > .intro { margin-top: 22px; }
  .split-head { gap: 22px; }
  .split-head .intro { margin-top: 0; }
  .case-section h3 { font-size: 23px; }
  .conclusion { margin-top: 40px; padding-top: 26px; font-size: 24px; line-height: 1.65; }
  .conclusion small { font-size: 13px; }
  .hero { padding-top: 56px; padding-bottom: 0; }
  .hero .section-label { font-size: 10px; margin-bottom: 28px; }
  .project-name { margin-bottom: 18px; font-size: 10px; }
  .project-name > span { font-size: 16px; }
  .hero h1 { font-size: clamp(37px, 10.3vw, 55px); line-height: 1.32; letter-spacing: -.035em; }
  .hero h1 br { display: none; }
  .hero-intro { margin-top: 26px; font-size: 16px; line-height: 1.95; }
  .hero-intro br, .intro br, .reflection-copy br { display: none; }
  .meta { margin-top: 34px; gap: 24px 18px; }
  .meta dt { font-size: 10px; margin-bottom: 7px; }
  .meta dd { font-size: 11px; line-height: 1.8; overflow-wrap: anywhere; }
  .hero-visual { margin-top: 38px; }
  .hero-visual > .media-placeholder .placeholder-body { min-height: 320px; }
  .hero-details { width: 100%; grid-template-columns: 1fr; gap: 18px; margin-top: 18px; }
  .hero-details .placeholder-body { min-height: 190px; }
  .challenge { padding-block: 76px 16px; }
  .challenge .wrap { gap: 22px; }
  .challenge blockquote > p:first-child { font-size: 26px; }
  .challenge blockquote > p + p { font-size: 16px; }
  .challenge > p[lang="en"] { font-size: 26px; }
  .challenge > p:not([lang]) { font-size: 16px; }
  .placeholder-body { min-height: 260px; padding: 32px 22px; }
  .placeholder-body h3 { font-size: 25px; }
  .placeholder-body > p { font-size: 13px; }
  .placeholder-detail { font-size: 11px; }
  .placeholder-top { padding-inline: 13px; }
  .placeholder-top small { font-size: 9px; overflow-wrap: anywhere; }
  .media-placeholder figcaption { padding: 12px 16px; font-size: 11px; }
  .placeholder-group { grid-template-columns: 1fr; gap: 20px; }
  .broken-flow ol, .architecture-flow ol { grid-template-columns: 1fr; row-gap: 0; }
  .broken-flow li, .broken-flow li + li { min-height: 0; padding: 23px 0; }
  .broken-flow li { display: grid; grid-template-columns: 100px 1fr; column-gap: 12px; align-items: baseline; }
  .broken-flow small { grid-column: 1; }
  .broken-flow strong { grid-column: 2; margin-top: 0; font-size: 17px; }
  .broken-flow li > p { grid-column: 2; }
  .broken-flow .break-label { grid-column: 2; margin-top: 16px; justify-self: start; }
  .broken-flow li + li::before { content: none; }
  .tools-line { gap: 10px 20px; margin-top: 12px; font-size: 11px; }
  .tools-line span:first-child { width: 100%; }
  .editorial-rows li { grid-template-columns: 29px 1fr; gap: 10px; padding-block: 23px; }
  .editorial-rows li h3 { font-size: 23px; }
  .editorial-rows li p { font-size: 14px; }
  .judgement-chain li { grid-template-columns: 25px 1fr; gap: 8px 12px; padding: 20px 14px; }
  .judgement-chain li > p { grid-column: 2; font-size: 16px; }
  .judgement-chain strong { font-size: 15px; }
  .judgement-chain h3 { font-size: 16px; }
  .judgement-chain .human-step { margin-top: 26px; }
  .strategy-list li { grid-template-columns: 28px 1fr; gap: 16px 12px; padding-block: 26px; }
  .strategy-list li > strong { font-size: 12px; }
  .strategy-list li > div { grid-column: 2; }
  .strategy-list li h3 { margin-top: 0; font-size: 24px; }
  .strategy-list li p { font-size: 14px; }
  .principle-strip { margin-top: 34px; gap: 15px; padding-block: 24px; }
  .principle-strip p { font-size: 19px; }
  .architecture-flow li, .architecture-flow li:first-child, .architecture-flow li:nth-child(4) { display: grid; grid-template-columns: 100px 1fr; gap: 10px 16px; padding: 25px 0; border: 0; border-top: 1px solid var(--line); }
  .architecture-flow li:last-child { border-bottom: 1px solid var(--line); }
  .architecture-flow strong { grid-column: 2; margin-top: 0; font-size: 18px; }
  .architecture-flow .flow-number { grid-column: 1; grid-row: 1; margin-bottom: 0; }
  .architecture-flow small { grid-column: 1; grid-row: 2; }
  .architecture-flow h3 { grid-column: 2; grid-row: 1 / 3; margin-top: 0; font-size: 18px; }
  .architecture-flow p { grid-column: 2; margin-top: 0; font-size: 13px; }
  .journey-strip ol { align-items: flex-start; flex-direction: column; gap: 0; padding-block: 16px; }
  .journey-strip li { display: block; font-size: 12px; }
  .journey-strip li:not(:last-child)::after { display: block; content: "↓"; margin: 8px 0; font-size: 15px; }
  .journey-visuals { grid-template-columns: 1fr; margin-top: 28px; gap: 20px; }
  .journey-visuals > :nth-child(2) { grid-column: auto; grid-row: auto; }
  .journey-visuals .placeholder-body { min-height: 260px; }
  .journey-visuals > :nth-child(2) .placeholder-body { min-height: 330px; }
  .journey-visuals .placeholder-body h3, .journey-visuals > :nth-child(2) h3 { font-size: 26px; }
  .research-layout, .review-layout, .leads-layout, .runs-layout { grid-template-columns: 1fr; gap: 22px; }
  .research-layout .placeholder-body { min-height: 280px; }
  .research-layout > :last-child .placeholder-body { min-height: 360px; }
  .reading-order ol { gap: 0; flex-direction: column; }
  .reading-order li { display: flex; gap: 22px; flex: none; align-items: baseline; padding-block: 13px; border-bottom: 1px solid var(--line); }
  .reading-order small { flex: 0 0 100px; }
  .reading-order strong { margin-top: 0; }
  .comparison { grid-template-columns: 1fr; gap: 28px; margin-top: 30px; padding-block: 24px; }
  .comparison > :nth-child(2) { padding-top: 24px; border-top: 1px solid var(--line); }
  .comparison h3 { font-size: 22px; }
  .evidence-layout .placeholder-body { min-height: 330px; }
  .reason-pair { grid-template-columns: 1fr; gap: 24px; }
  .reason-pair > :nth-child(2) { padding-top: 23px; border-top: 1px solid var(--line); }
  .reason-pair strong { font-size: 16px; }
  .reason-pair p { font-size: 14px; }
  .semantics { margin-top: 30px; }
  .semantics > div, .semantics li { grid-template-columns: 1fr; gap: 10px; padding-block: 18px; }
  .semantics p { font-size: 14px; }
  .review-layout .placeholder-body, .leads-layout .placeholder-body { min-height: 320px; }
  .state-flow ol { align-items: flex-start; flex-direction: column; gap: 0; }
  .state-flow li { display: block; }
  .state-flow li:not(:last-child)::after { display: block; content: "↓"; margin: 8px 0; }
  .boundary-note { align-items: flex-start; flex-direction: column; gap: 12px; margin-top: 28px; padding-block: 22px; }
  .boundary-note strong { font-size: 24px; }
  .boundary-note p { font-size: 14px; }
  .drawer-order ol { grid-template-columns: 1fr; gap: 0; }
  .drawer-order li { padding-block: 13px; font-size: 11px; }
  .runs-layout { gap: 34px; }
  .run-history li { padding-block: 18px; }
  .run-timeline li { grid-template-columns: 27px 1fr; gap: 8px 12px; padding-block: 18px; }
  .run-timeline li > p { grid-column: 2; margin-top: 0; }
  .retry-reserved { margin-top: 28px; }
  .retry-reserved { grid-template-columns: 1fr; gap: 18px; }
  .retry-reserved h3 { font-size: 23px; }
  .system-layers li { grid-template-columns: 1fr; gap: 8px; padding-block: 21px; }
  .system-layers strong { font-size: 14px; }
  .system-layers p { font-size: 16px; }
  .system-layers li > p { grid-column: auto; }
  .system-explanation dl > div { grid-template-columns: 98px 1fr; gap: 14px; }
  .metrics { margin-top: 36px; grid-template-columns: 1fr 1fr; gap: 32px 20px; }
  .metrics strong { font-size: 32px; }
  .metrics .important, .metrics .first { grid-column: 1 / -1; grid-row: 1; }
  .metrics .important strong, .metrics .first strong { font-size: 60px; }
  .metrics span, .metrics small, .metrics p { margin-top: 9px; font-size: 11px; }
  .engineering-principles { gap: 12px 22px; margin-top: 34px; font-size: 10px; }
  .scope-layout { grid-template-columns: 1fr; gap: 30px; margin-top: 32px; }
  .scope-layout h3 { font-size: 23px; }
  .scope-layout ul { gap: 5px 20px; }
  .validation-grid { grid-template-columns: 1fr; grid-template-areas: "workflow" "refresh" "database" "interface"; row-gap: 34px; }
  .validation-grid h3 { font-size: 23px; margin-bottom: 20px; }
  .validation-workflow .journey-strip ol { flex-direction: column; }
  .validation-workflow .journey-strip li { font-size: 12px; }
  .validation-workflow .journey-strip li:not(:last-child)::after { margin: 7px 0; }
  .validation-database .test-count { font-size: 62px; }
  .verified-scope { margin-top: 34px; }
  .reflection { padding-block: 100px 110px; }
  .reflection .section-title { font-size: 32px; }
  .reflection-copy { margin-top: 32px; font-size: 16px; line-height: 2; }
  .reflection-copy p + p { margin-top: 25px; }
  .reflection-pillars { margin-top: 46px; grid-template-columns: 1fr; gap: 24px; }
  .reflection-pillars p { margin-top: 8px; font-size: 15px; }
  .reflection .conclusion { margin-top: 55px; font-size: 27px; line-height: 1.7; }
  .next-project { padding-block: 56px; }
  .next-inner { flex-direction: column; align-items: stretch; gap: 32px; }
  .next-project h2 { font-size: 30px; }
  .next-project .next-visual { width: 100%; }
  .next-project .next-link { margin-top: 24px; font-size: 13px; }
  .site-footer { padding-block: 23px; }
  .site-footer .wrap { flex-direction: column; gap: 9px; font-size: 11px; }
}