:root {
  color-scheme: light;
  --paper: #e7ece9;
  --paper-deep: #d9e1dc;
  --surface: #f7f9f7;
  --ink: #17201c;
  --muted: #5a685f;
  --faint: #7d8982;
  --line: #bdc9c1;
  --accent: #146c73;
  --accent-deep: #104e53;
  --accent-soft: #c9e3df;
  --signal: #d14d36;
  --ops: #854625;
  --ops-deep: #633118;
  --ops-soft: #ead6bd;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --accent-serif: "STKaiti", "Kaiti SC", "KaiTi", "Noto Serif CJK SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --shell: min(1180px, calc(100vw - 48px));
}

[data-track="operations"] {
  --accent: #854625;
  --accent-deep: #633118;
  --accent-soft: #ead6bd;
  --signal: #a83c2b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 100% 0%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 30rem),
    repeating-linear-gradient(0deg, transparent 0 27px, rgb(23 32 28 / 0.035) 28px),
    var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
button { font: inherit; }
.shell { width: var(--shell); margin-inline: auto; }
.skip-link { position: fixed; z-index: 50; top: 12px; left: 12px; padding: 8px 14px; color: var(--surface); background: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.site-header { border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 70px; }
.wordmark { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 750; letter-spacing: .04em; }
.wordmark-mark { display: grid; width: 25px; height: 25px; place-items: center; color: var(--surface); background: var(--accent); font-family: var(--mono); font-size: 15px; }
.site-nav { display: flex; gap: 24px; align-items: center; margin-left: auto; margin-right: 34px; }
.site-nav a { display: inline-flex; min-height: 42px; align-items: center; color: var(--muted); font-size: 13px; font-weight: 700; text-decoration: none; }
.site-nav a:hover { color: var(--ink); }
.header-note { margin: 0; color: var(--faint); font-family: var(--mono); font-size: 11px; letter-spacing: .08em; }

.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero::after { position: absolute; top: 0; right: -8vw; width: min(45vw, 610px); height: 100%; content: ""; background: linear-gradient(135deg, transparent 40%, color-mix(in srgb, var(--accent) 8%, transparent)); pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(44px, 7vw, 92px); align-items: center; min-height: 640px; padding-block: 88px; }
.hero-copy, .trace-panel { position: relative; z-index: 1; }
.eyebrow { display: flex; align-items: center; gap: 10px; margin: 0 0 18px; color: var(--accent-deep); font-family: var(--sans); font-size: 13px; font-weight: 750; letter-spacing: .07em; line-height: 1.5; }
.eyebrow span { width: 31px; height: 2px; background: currentColor; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { text-wrap: balance; }
h1, h2 { font-family: var(--serif); font-weight: 700; letter-spacing: -.018em; }
h1 { max-width: 720px; margin-bottom: 25px; font-size: clamp(44px, 5vw, 64px); line-height: 1.08; }
h1 em { display: block; color: var(--accent); font-family: var(--accent-serif); font-style: normal; font-weight: 700; }
.hero-lead { max-width: 620px; margin-bottom: 17px; font-size: clamp(17px, 1.7vw, 20px); font-weight: 600; line-height: 1.65; }
.hero-detail { max-width: 600px; margin-bottom: 28px; color: var(--muted); }
.text-link { display: inline-flex; gap: 13px; align-items: center; padding-bottom: 5px; border-bottom: 1px solid var(--ink); text-decoration: none; font-weight: 750; transition: color .2s, gap .2s; }
.text-link:hover { gap: 19px; color: var(--accent-deep); }

.hero-grid--evidence { grid-template-columns: minmax(0, 1.25fr) minmax(330px, .75fr); }
.hero-grid--evidence .hero-copy { max-width: 710px; }
.evidence-card { position: relative; z-index: 1; padding: 25px 26px 21px; border: 1px solid var(--ink); background: color-mix(in srgb, var(--surface) 94%, var(--accent-soft)); box-shadow: 9px 9px 0 color-mix(in srgb, var(--accent) 24%, transparent); }
.evidence-card::before { position: absolute; top: -7px; right: 28px; width: 54px; height: 14px; content: ""; background: color-mix(in srgb, var(--accent-soft) 70%, white); transform: rotate(1.5deg); }
.evidence-head { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 24px; padding-bottom: 11px; color: var(--accent-deep); border-bottom: 1px solid var(--line); font-family: var(--mono); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.evidence-title { max-width: 315px; margin-bottom: 25px; font-family: var(--serif); font-size: 25px; font-weight: 700; letter-spacing: -.015em; line-height: 1.35; }
.evidence-flow { position: relative; }
.evidence-flow::before { position: absolute; top: 29px; bottom: 29px; left: 28px; width: 1px; content: ""; background: var(--line); }
.evidence-row { position: relative; display: grid; grid-template-columns: 58px 1fr; gap: 15px; min-height: 74px; }
.evidence-tag { position: relative; z-index: 1; align-self: start; padding: 5px 0; color: var(--accent-deep); border: 1px solid var(--accent); background: var(--surface); font-family: var(--mono); font-size: 10px; font-weight: 800; text-align: center; }
.evidence-row--signal .evidence-tag { color: var(--surface); border-color: var(--accent); background: var(--accent); }
.evidence-row strong, .evidence-row small { display: block; }
.evidence-row strong { margin-top: 1px; font-size: 14px; line-height: 1.45; }
.evidence-row small { margin-top: 3px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.evidence-foot { margin: 7px 0 0; padding-top: 14px; color: var(--muted); border-top: 1px solid var(--line); font-family: var(--mono); font-size: 10px; letter-spacing: .04em; }

.trace-panel { padding: 31px; border: 1px solid var(--ink); background: var(--surface); box-shadow: 9px 9px 0 color-mix(in srgb, var(--accent) 22%, transparent); }
.trace-kicker { margin-bottom: 24px; color: var(--muted); font-size: 13px; font-weight: 700; }
.process-trace { position: relative; display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.process-trace::before { position: absolute; top: 30px; bottom: 30px; left: 15px; width: 1px; content: ""; background: var(--line); }
.process-trace li { position: relative; display: grid; grid-template-columns: 44px 1fr; column-gap: 12px; min-height: 78px; padding-block: 0 14px; }
.trace-index { position: relative; z-index: 1; display: grid; width: 31px; height: 31px; place-items: center; color: var(--accent-deep); border: 1px solid var(--accent); background: var(--surface); border-radius: 50%; font-family: var(--mono); font-size: 10px; font-weight: 700; }
.trace-alert .trace-index { color: var(--surface); border-color: var(--signal); background: var(--signal); }
.process-trace strong { align-self: end; font-size: 16px; line-height: 1.2; }
.process-trace small { grid-column: 2; color: var(--muted); font-size: 12px; }

.gate-section, .cases-section, .steps-section { padding-block: clamp(82px, 11vw, 150px); }
.split-heading { display: grid; grid-template-columns: 1fr .68fr; gap: 70px; align-items: end; margin-bottom: 53px; }
.split-heading h2, .section-heading h2, .judgement-grid h2, .boundary-grid h2, .start-inner h2 { margin-bottom: 0; font-size: clamp(35px, 4vw, 52px); line-height: 1.12; }
.split-heading > p { max-width: 440px; margin-bottom: 4px; color: var(--muted); font-size: 17px; }
.gate-list { display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--ink); }
.gate-list > div { min-height: 202px; padding: 22px 18px 22px 0; border-right: 1px solid var(--line); }
.gate-list > div + div { padding-left: 18px; }
.gate-list > div:last-child { border-right: 0; }
.gate-list span, .case-number { display: block; margin-bottom: 25px; color: var(--accent); font-family: var(--mono); font-size: 12px; font-weight: 700; }
.gate-list strong { display: block; margin-bottom: 8px; font-size: 16px; }
.gate-list p { margin-bottom: 0; color: var(--muted); font-size: 13px; line-height: 1.68; }

.cases-section { background: var(--ink); color: var(--surface); }
.cases-section .eyebrow { color: color-mix(in srgb, var(--accent-soft) 85%, white); }
.section-heading { margin-bottom: 51px; }
.section-heading h2 { max-width: 750px; }
.cases-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid rgb(255 255 255 / .37); border-left: 1px solid rgb(255 255 255 / .37); }
.cases-grid--three { grid-template-columns: repeat(3, 1fr); }
.case-card { min-height: 347px; padding: 29px 30px; border-right: 1px solid rgb(255 255 255 / .37); border-bottom: 1px solid rgb(255 255 255 / .37); }
.case-number { color: color-mix(in srgb, var(--accent-soft) 87%, white); }
.case-card h3 { margin-bottom: 16px; font-family: var(--serif); font-size: clamp(24px, 2.1vw, 30px); font-weight: 700; line-height: 1.28; letter-spacing: -.015em; }
.case-card > p:not(.case-number):not(.case-result) { color: #c7d2cb; font-size: 14px; }
.case-result { margin: 23px 0 0; color: var(--accent-soft); font-size: 14px; font-weight: 650; line-height: 1.6; }

.judgement-section { padding-block: clamp(90px, 12vw, 170px); }
.judgement-grid { display: grid; grid-template-columns: .87fr 1.13fr; gap: clamp(55px, 10vw, 135px); }
.large-copy { max-width: 440px; margin-top: 26px; color: var(--muted); font-size: 18px; }
.principle-list { border-top: 1px solid var(--ink); }
.principle-list article { display: grid; grid-template-columns: 115px 1fr; gap: 22px; padding-block: 25px; border-bottom: 1px solid var(--line); }
.principle-list span { padding-top: 4px; color: var(--accent-deep); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: .08em; }
.principle-list h3 { margin-bottom: 7px; font-family: var(--serif); font-size: 24px; line-height: 1.3; }
.principle-list p { grid-column: 2; margin-bottom: 0; color: var(--muted); font-size: 14px; }

.steps-section { border-top: 1px solid var(--line); }
.steps-list { margin-block: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.steps-list li { display: grid; grid-template-columns: 116px 1fr; gap: 22px; padding-block: 24px; border-bottom: 1px solid var(--line); }
.steps-list > li > span { color: var(--accent); font-family: var(--mono); font-size: 13px; font-weight: 700; }
.steps-list h3 { margin-bottom: 4px; font-family: var(--serif); font-size: 25px; line-height: 1.3; }
.steps-list p { margin-bottom: 0; color: var(--muted); }

.boundary-section { padding-block: 72px; color: var(--surface); background: var(--accent-deep); }
.boundary-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; }
.boundary-grid .eyebrow { color: var(--accent-soft); }
.boundary-grid ul { margin: 0; padding: 0; border-top: 1px solid rgb(255 255 255 / .4); list-style: none; }
.boundary-grid li { padding: 14px 0 14px 28px; border-bottom: 1px solid rgb(255 255 255 / .25); font-size: 15px; line-height: 1.55; }
.boundary-grid li::before { margin-left: -28px; margin-right: 13px; color: var(--accent-soft); content: "×"; font-family: var(--mono); }

.start-section { padding-block: clamp(95px, 13vw, 180px); }
.start-inner { max-width: 860px; }
.start-inner > h2 { margin-bottom: 23px; }
.start-inner > p:not(.budget-note):not(.safety-note) { color: var(--muted); font-size: 18px; }
.message-box { position: relative; margin-block: 42px 18px; padding: 26px 146px 26px 28px; border: 1px solid var(--ink); background: var(--surface); box-shadow: 7px 7px 0 var(--accent-soft); }
.message-label { display: block; margin-bottom: 9px; color: var(--accent-deep); font-family: var(--mono); font-size: 11px; font-weight: 700; letter-spacing: .08em; }
.message-box p { margin-bottom: 0; font-family: var(--serif); font-size: clamp(20px, 2.2vw, 27px); font-weight: 700; line-height: 1.35; }
.copy-button { position: absolute; right: 18px; bottom: 20px; padding: 8px 12px; color: var(--ink); border: 1px solid var(--ink); border-radius: 0; background: transparent; cursor: pointer; font-size: 13px; font-weight: 700; transition: background .2s, color .2s; }
.copy-button:hover { color: var(--surface); background: var(--ink); }
.budget-note { margin: 20px 0 5px; font-weight: 700; }
.safety-note { color: var(--muted); font-size: 13px; }
.site-footer { padding-block: 23px; border-top: 1px solid var(--line); color: var(--faint); font-family: var(--mono); font-size: 10px; letter-spacing: .08em; }
.toast { position: fixed; z-index: 20; right: 18px; bottom: 18px; padding: 11px 14px; color: var(--surface); background: var(--ink); opacity: 0; pointer-events: none; transform: translateY(12px); transition: opacity .2s, transform .2s; }
.toast.is-visible { opacity: 1; transform: translateY(0); }

.hero--combined .hero-grid { grid-template-columns: 1.05fr .95fr; }
.route-map { position: relative; z-index: 1; padding: 31px; border: 1px solid var(--ink); background: var(--surface); box-shadow: 9px 9px 0 color-mix(in srgb, var(--accent) 22%, transparent); }
.route-lane { display: grid; grid-template-columns: 45px 1fr; gap: 15px; align-items: center; padding-block: 20px; border-top: 1px solid var(--line); }
.route-lane--operations { border-color: color-mix(in srgb, var(--ops) 35%, var(--line)); }
.route-code { display: grid; width: 35px; height: 35px; place-items: center; color: var(--surface); background: var(--accent); font-family: var(--mono); font-size: 12px; font-weight: 800; }
.route-lane--operations .route-code { background: var(--ops); }
.route-lane strong { display: block; margin-bottom: 3px; font-family: var(--serif); font-size: 22px; line-height: 1.2; }
.route-lane small { display: block; color: var(--muted); font-size: 12px; line-height: 1.6; }
.route-outcome { margin-top: 13px; padding: 18px; color: var(--surface); background: var(--ink); }
.route-outcome span { display: block; margin-bottom: 7px; color: var(--accent-soft); font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: .09em; }
.route-outcome strong { font-size: 13px; line-height: 1.6; }

.directions-section { padding-block: clamp(82px, 11vw, 145px); }
.direction-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.direction-card { position: relative; min-height: 315px; padding: 32px; border: 1px solid var(--ink); background: var(--surface); text-decoration: none; transition: transform .2s, box-shadow .2s; }
.direction-card:hover { transform: translateY(-4px); }
.direction-card--workflow:hover { box-shadow: 7px 7px 0 var(--accent-soft); }
.direction-card--operations:hover { box-shadow: 7px 7px 0 var(--ops-soft); }
.direction-index { display: block; margin-bottom: 42px; color: var(--accent-deep); font-family: var(--mono); font-size: 11px; font-weight: 800; letter-spacing: .09em; }
.direction-card--operations .direction-index { color: var(--ops-deep); }
.direction-card h3 { max-width: 480px; margin-bottom: 17px; font-family: var(--serif); font-size: clamp(30px, 3.1vw, 43px); line-height: 1.08; letter-spacing: -.04em; }
.direction-card p { max-width: 510px; margin-bottom: 30px; color: var(--muted); }
.direction-card > strong { position: absolute; right: 30px; bottom: 25px; color: var(--accent-deep); font-size: 13px; }
.direction-card--operations > strong { color: var(--ops-deep); }

.service-heading { padding-block: clamp(88px, 12vw, 155px); scroll-margin-top: 20px; border-top: 1px solid var(--line); }
.service-heading-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(55px, 10vw, 135px); align-items: end; }
.service-heading h2 { margin-bottom: 0; font-size: clamp(42px, 5.4vw, 72px); line-height: 1.02; }
.service-heading-grid > div:last-child { max-width: 570px; justify-self: end; }
.service-heading-grid > div:last-child > p:last-child { margin-bottom: 0; color: var(--muted); }
.service-lead { margin-bottom: 18px; color: var(--ink); font-size: clamp(18px, 2vw, 23px); font-weight: 650; line-height: 1.55; }
.service-heading--operations { color: #2b1b13; background: #eee7df; }
.eyebrow--ops { color: var(--ops-deep); }

.ops-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 70px; border-top: 1px solid var(--ops-deep); border-left: 1px solid color-mix(in srgb, var(--ops) 45%, transparent); }
.ops-card { min-height: 330px; padding: 27px; border-right: 1px solid color-mix(in srgb, var(--ops) 45%, transparent); border-bottom: 1px solid color-mix(in srgb, var(--ops) 45%, transparent); }
.ops-card > span { display: block; margin-bottom: 28px; color: var(--ops); font-family: var(--mono); font-size: 11px; font-weight: 800; }
.ops-card h3 { margin-bottom: 15px; font-family: var(--serif); font-size: clamp(25px, 2.4vw, 34px); line-height: 1.16; letter-spacing: -.035em; }
.ops-card p { color: #705d52; font-size: 14px; }
.ops-card strong { display: block; margin-top: 24px; color: var(--ops-deep); font-size: 14px; line-height: 1.6; }
.ops-boundary { display: grid; grid-template-columns: 135px 1fr; gap: 24px; margin-top: 28px; padding: 22px 0; border-top: 1px solid var(--ops-deep); border-bottom: 1px solid color-mix(in srgb, var(--ops) 40%, transparent); }
.ops-boundary span { color: var(--ops); font-family: var(--mono); font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.ops-boundary p { max-width: 850px; margin-bottom: 0; color: #705d52; font-size: 14px; }

.message-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-block: 42px 20px; }
.message-grid .message-box { min-height: 235px; margin: 0; padding: 28px 28px 72px; }
.message-box--ops { box-shadow: 7px 7px 0 var(--ops-soft); }
.message-box--ops .message-label { color: var(--ops-deep); }
.message-grid .copy-button { bottom: 20px; left: 28px; right: auto; }

.hero-grid--single { display: block; padding-block: 110px; }
.hero-grid--single .hero-copy { max-width: 860px; }
.hero-grid--single h1 { max-width: 900px; font-size: clamp(47px, 6vw, 80px); }

.case-solution { margin: 21px 0 0; padding-top: 18px; color: color-mix(in srgb, var(--accent-soft) 92%, white); border-top: 1px solid rgb(255 255 255 / .22); font-size: 14px; font-weight: 600; line-height: 1.65; }

.gap-section { padding-block: clamp(86px, 12vw, 160px); }
.gap-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.gap-grid article { min-height: 285px; padding: 29px 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.gap-grid span { display: block; margin-bottom: 22px; color: var(--accent); font-family: var(--mono); font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.gap-grid p { margin-bottom: 0; color: var(--muted); font-size: 15px; }
.gap-card--signal { color: var(--surface); background: var(--ink); }
.gap-card--signal span { color: var(--accent-soft); }
.gap-card--signal p { color: #c7d2cb; }
.gap-card--signal strong { color: var(--surface); font-weight: 800; }

.pitch-section { padding-block: clamp(90px, 12vw, 165px); color: var(--surface); background: var(--accent-deep); }
.pitch-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(55px, 10vw, 135px); }
.pitch-grid .eyebrow { color: var(--accent-soft); }
.pitch-grid h2 { margin-bottom: 0; font-size: clamp(35px, 4vw, 52px); line-height: 1.14; }
.pitch-copy { max-width: 620px; }
.pitch-copy p { margin-bottom: 19px; color: #d6dfda; font-size: 15.5px; line-height: 1.75; }
.pitch-emphasis { color: var(--surface) !important; font-weight: 700; }

.start-list { margin-block: 27px 34px; padding: 0; border-top: 1px solid var(--ink); list-style: none; }
.start-list li { display: grid; grid-template-columns: 116px 1fr; gap: 22px; align-items: baseline; padding-block: 17px; border-bottom: 1px solid var(--line); }
.start-list li span { color: var(--accent); font-family: var(--mono); font-size: 13px; font-weight: 800; }
.start-list li:nth-last-child(-n + 0) { border-bottom-color: var(--line); }

.switch-strip { padding-block: 20px 0; }
.switch-strip p { margin: 0; padding: 17px 22px; color: var(--surface); background: var(--ink); font-size: 13.5px; }
.switch-strip a { color: var(--accent-soft); font-weight: 800; text-decoration: none; border-bottom: 1px solid var(--accent-soft); }
.switch-strip a:hover { color: var(--surface); }
.footer-row { display: flex; justify-content: space-between; gap: 20px; padding-block: 16px 0; }
@media (max-width: 480px) { .footer-row { flex-direction: column; gap: 5px; } }

:focus-visible { outline: 3px solid var(--signal); outline-offset: 4px; }
@media (max-width: 840px) {
  :root { --shell: min(100% - 32px, 1180px); }
  .header-inner { min-height: 60px; }
  .header-note { font-size: 9px; }
  .hero-grid, .hero-grid--evidence, .hero--combined .hero-grid, .split-heading, .judgement-grid, .boundary-grid, .service-heading-grid, .gap-grid, .pitch-grid { grid-template-columns: 1fr; }
  .hero-grid { gap: 50px; min-height: 0; padding-block: 73px; }
  .hero-grid--single { padding-block: 73px; }
  .split-heading { gap: 22px; margin-bottom: 42px; }
  .split-heading h2, .section-heading h2, .judgement-grid h2, .boundary-grid h2, .start-inner h2 { font-size: clamp(32px, 7.8vw, 42px); }
  .gate-list { grid-template-columns: 1fr 1fr; }
  .gate-list > div { min-height: 165px; padding: 18px; border-bottom: 1px solid var(--line); }
  .gate-list > div + div { padding-left: 18px; }
  .gate-list > div:nth-child(2n) { border-right: 0; }
  .gate-list > div:last-child { grid-column: 1 / -1; border-right: 0; }
  .cases-grid, .cases-grid--three { grid-template-columns: 1fr; }
  .case-card { min-height: 0; padding: 28px 22px; }
  .principle-list article { grid-template-columns: 95px 1fr; }
  .boundary-grid { gap: 38px; }
  .message-box { padding: 24px; }
  .copy-button { position: static; margin-top: 17px; }
  .site-nav { gap: 15px; margin-right: 0; }
  .header-note { display: none; }
  .direction-grid, .message-grid { grid-template-columns: 1fr; }
  .direction-card { min-height: 290px; }
  .service-heading-grid { gap: 35px; }
  .service-heading-grid > div:last-child { justify-self: start; }
  .ops-grid { grid-template-columns: 1fr; }
  .ops-card { min-height: 0; }
  .message-grid .message-box { min-height: 0; padding: 24px; }
  .message-grid .copy-button { position: static; margin-top: 17px; }
}
@media (max-width: 480px) {
  .header-inner { flex-wrap: wrap; padding-block: 13px; }
  .site-nav { order: 3; width: 100%; justify-content: space-between; margin-top: 10px; padding-top: 9px; border-top: 1px solid var(--line); }
  .site-nav a { min-height: 44px; font-size: 12px; }
  h1, .hero-grid--single h1 { font-size: clamp(37px, 10.5vw, 46px); line-height: 1.12; }
  .hero-lead { font-size: 17px; }
  .eyebrow { font-size: 12.5px; }
  .evidence-card { padding: 22px 20px 18px; }
  .evidence-title { font-size: 22px; }
  .trace-panel { padding: 23px 20px; }
  .gate-list { grid-template-columns: 1fr; }
  .gate-list > div, .gate-list > div + div { min-height: 0; padding: 18px 0; border-right: 0; }
  .gate-list > div:last-child { grid-column: auto; }
  .principle-list article, .steps-list li, .start-list li { grid-template-columns: 1fr; gap: 9px; }
  .principle-list p { grid-column: 1; }
  .direction-card { min-height: 0; padding: 25px 22px 72px; }
  .direction-index { margin-bottom: 29px; }
  .ops-boundary { grid-template-columns: 1fr; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}