:root {
  --ink: #112433;
  --ink-soft: #345060;
  --paper: #fcfaf5;
  --mist: #e7f0ed;
  --sand: #f5ead5;
  --amber: #f1b743;
  --amber-deep: #b16d12;
  --teal: #1b756a;
  --coral: #c35f45;
  --line: #d5ded8;
  --white: #ffffff;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif; line-height: 1.68; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
img { display: block; max-width: 100%; }

.site-header { position: sticky; top: 0; z-index: 30; display: grid; grid-template-columns: 220px 1fr auto; align-items: center; gap: 28px; min-height: 72px; padding: 10px max(24px, calc((100vw - var(--max)) / 2)); background: rgba(252,250,245,.96); border-bottom: 1px solid rgba(17,36,51,.13); backdrop-filter: blur(12px); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; line-height: 1.08; }
.brand-mark { display: inline-grid; place-items: center; width: 38px; height: 38px; color: var(--ink); background: var(--amber); font-size: 13px; font-weight: 900; letter-spacing: .07em; }
.brand b { display: block; font-size: 14px; }
.brand small { display: block; margin-top: 3px; color: #6b7780; font-size: 11px; letter-spacing: .12em; }
.site-header nav { display: flex; justify-content: center; gap: 22px; }
.site-header nav a, .header-link { color: #34424c; font-size: 14px; text-decoration: none; white-space: nowrap; }
.site-header nav a:hover, .header-link:hover { color: var(--amber-deep); }
.header-link { padding: 7px 0; border-bottom: 2px solid var(--amber); }

.hero { position: relative; isolation: isolate; display: grid; grid-template-columns: minmax(0, .95fr) minmax(420px, .95fr); min-height: 700px; overflow: hidden; background: var(--ink); color: white; }
.hero::after { position: absolute; inset: auto 0 0; z-index: -1; height: 9px; background: var(--amber); content: ""; }
.hero-copy { z-index: 2; align-self: center; max-width: 620px; margin-left: max(24px, calc((100vw - var(--max)) / 2)); padding: 90px 40px 95px 0; }
.kicker, .eyebrow, .section-label { margin: 0; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.kicker { color: var(--amber); }
.hero h1 { max-width: 640px; margin: 22px 0 24px; font-size: clamp(42px, 5vw, 75px); line-height: 1.08; letter-spacing: 0; }
.hero-lede { max-width: 510px; margin: 0; color: #d4dde1; font-size: 18px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; margin-top: 38px; }
.button { display: inline-flex; align-items: center; min-height: 49px; padding: 0 23px; font-weight: 800; text-decoration: none; }
.button-amber { color: var(--ink); background: var(--amber); }
.button-amber:hover { background: #ffd06a; }
.text-action { color: white; font-weight: 700; }
.text-action span { margin-left: 8px; color: var(--amber); }
.hero-facts { display: flex; gap: 0; margin: 62px 0 0; border-top: 1px solid rgba(255,255,255,.25); }
.hero-facts div { min-width: 132px; padding: 16px 20px 0 0; }
.hero-facts dt { color: var(--amber); font-weight: 900; }
.hero-facts dd { margin: 5px 0 0; color: #c9d4d7; font-size: 13px; }
.hero-visual { position: relative; z-index: 1; align-self: stretch; min-height: 100%; margin: 0; }
.hero-visual::before { position: absolute; inset: 0; z-index: 1; background: rgba(17,36,51,.18); content: ""; }
.hero-visual img { width: 100%; height: 100%; min-height: 700px; object-fit: cover; object-position: 38% center; }

.section { padding: 112px max(24px, calc((100vw - var(--max)) / 2)); }
.section-paper { background: var(--paper); }
.section-ink { background: var(--ink); color: white; }
.section-sand { background: var(--sand); }
.section-video { background: var(--mist); }
.section-ai { background: #e8e1d3; }
.section-label { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; color: var(--amber-deep); }
.section-label::before { width: 42px; height: 2px; background: currentColor; content: ""; }
.section-label-light { color: var(--amber); }
.section-intro { display: grid; gap: 58px; }
.intro-wide { grid-template-columns: minmax(0, 1.08fr) minmax(280px, .72fr); align-items: end; }
.section-intro h2 { margin: 0; font-size: clamp(34px, 4vw, 58px); line-height: 1.12; letter-spacing: 0; }
.section-intro > p { max-width: 430px; margin: 0 0 7px; color: var(--ink-soft); font-size: 18px; }
.intro-light > p { color: #d4dfe1; }
.intro-light .kicker { margin-bottom: 14px; }

.trust-loop { position: relative; display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: center; margin-top: 64px; }
.loop-card { min-height: 258px; padding: 31px; border: 1px solid var(--line); background: white; }
.loop-card h3 { margin: 11px 0 9px; font-size: 27px; line-height: 1.24; }
.loop-card p:not(.eyebrow) { margin: 0; color: #53636c; }
.loop-number { color: var(--amber-deep); font-size: 14px; font-weight: 900; letter-spacing: .12em; }
.machine-card { border-top: 6px solid var(--teal); }
.human-card { border-top: 6px solid var(--coral); }
.inquiry-card { grid-column: 1 / -1; width: min(620px, 100%); justify-self: center; margin-top: 54px; border-top: 6px solid var(--amber); }
.loop-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 21px; }
.loop-tags span { padding: 4px 9px; color: #38535b; background: #edf4f2; font-size: 12px; font-weight: 800; }
.loop-arrow { color: var(--amber-deep); font-size: 38px; font-weight: 300; text-align: center; }
.loop-arrow span { display: block; color: #697a7d; font-size: 12px; font-weight: 700; white-space: nowrap; }
.arrow-down { position: absolute; top: calc(50% + 128px); left: 50%; transform: translateX(-50%); }

.content-types { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin-top: 72px; border: 1px solid rgba(255,255,255,.21); background: rgba(255,255,255,.21); }
.content-types article { min-height: 276px; padding: 30px; background: var(--ink); }
.content-types span { color: var(--amber); font-size: 14px; font-weight: 900; }
.content-types h3 { margin: 18px 0 10px; font-size: 23px; }
.content-types p { margin: 0; color: #d1dadd; font-size: 14px; }
.content-types .example { margin-top: 18px; color: var(--amber); font-size: 13px; }
.human-ai { display: grid; grid-template-columns: .92fr 1.08fr; gap: 75px; margin-top: 90px; padding-top: 60px; border-top: 1px solid rgba(255,255,255,.3); }
.human-ai h3 { max-width: 500px; margin: 15px 0; font-size: 34px; line-height: 1.18; }
.human-ai-copy > p:last-child { max-width: 500px; margin: 0; color: #d0dbdf; }
.workflow-steps { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin: 0; padding: 0; list-style: none; background: rgba(255,255,255,.18); }
.workflow-steps li { display: flex; gap: 15px; min-height: 139px; padding: 25px; background: #1a3341; }
.workflow-steps span { display: inline-grid; flex: 0 0 auto; place-items: center; width: 30px; height: 30px; color: var(--ink); background: var(--amber); font-weight: 900; }
.workflow-steps b, .workflow-steps small { display: block; }
.workflow-steps small { margin-top: 8px; color: #c7d3d7; font-size: 13px; line-height: 1.55; }

.six-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 68px; border: 1px solid var(--line); background: var(--line); }
.six-grid article { min-height: 230px; padding: 29px; background: var(--paper); }
.six-no { color: var(--amber-deep); font-size: 13px; font-weight: 900; letter-spacing: .1em; }
.six-grid h3 { margin: 17px 0 9px; font-size: 23px; }
.six-grid p { margin: 0; color: #5b6c72; font-size: 14px; }
.article-anatomy { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 1px; margin-top: 76px; border: 1px solid var(--line); background: var(--line); }
.anatomy-main, .anatomy-side { padding: 35px; background: white; }
.tiny-label { margin: 0; color: var(--amber-deep); font-size: 12px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.anatomy-main h3 { margin: 9px 0 19px; font-size: 29px; line-height: 1.25; }
.answer-block { margin: 0; padding: 15px 18px; border-left: 4px solid var(--amber); background: #fff7dd; }
.fake-table { display: grid; grid-template-columns: 1fr 1fr 1.2fr; margin-top: 20px; border-top: 1px solid var(--line); border-left: 1px solid var(--line); font-size: 13px; }
.fake-table > * { min-height: 40px; padding: 9px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.fake-table span { color: #42535a; background: #eef3f1; font-weight: 800; }
.byline { display: flex; align-items: center; gap: 10px; margin: 20px 0 0; color: #4d5e64; font-size: 13px; }
.byline img { width: 36px; height: 36px; border-radius: 50%; object-fit: cover; }
.anatomy-side { background: #132c3a; color: white; }
.anatomy-side .tiny-label { color: var(--amber); }
.anatomy-side code { display: block; margin: 19px 0; padding: 18px; overflow-wrap: anywhere; color: #c8e3d9; background: #0c1d27; font-size: 12px; line-height: 1.75; }
.anatomy-side > p:last-child { color: #cbd6d9; font-size: 14px; }

.cluster-map { position: relative; min-height: 510px; margin-top: 62px; }
.cluster-node { position: absolute; z-index: 2; display: block; width: 210px; min-height: 110px; padding: 18px 18px 16px; color: var(--ink); border: 1px solid #d7cbb5; background: var(--paper); font-size: 16px; font-weight: 800; line-height: 1.35; text-decoration: none; }
.cluster-node:hover { outline: 3px solid var(--amber); }
.cluster-node span { display: block; margin-bottom: 7px; color: var(--amber-deep); font-size: 11px; letter-spacing: .1em; }
.pillar { top: 187px; left: 50%; width: 250px; min-height: 135px; transform: translateX(-50%); border: 0; background: var(--ink); color: white; font-size: 22px; }
.pillar span { color: var(--amber); }
.cluster-a { top: 0; left: 9%; }
.cluster-b { top: 0; right: 9%; }
.cluster-c { bottom: 20px; left: 7%; }
.cluster-d { bottom: 20px; right: 7%; }
.cluster-e { bottom: 0; left: 50%; transform: translateX(-50%); }
.cluster-lines { position: absolute; inset: 36px 4% 26px; z-index: 1; width: 92%; height: 420px; overflow: visible; }
.cluster-lines path { fill: none; stroke: #b98634; stroke-width: 2.4; stroke-dasharray: 7 9; }
.cluster-note { max-width: 780px; margin: 0 auto; color: #546169; text-align: center; }

.section-video .section-intro > p { color: #3e5960; }
.pillars { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 65px; }
.pillars article { min-height: 252px; padding: 25px 24px; border-top: 5px solid var(--ink); background: var(--paper); }
.pillar-percent { color: var(--coral); font-size: 32px; font-weight: 900; line-height: 1; }
.pillars h3 { margin: 18px 0 7px; font-size: 21px; }
.pillars p { margin: 0; color: #59686b; font-size: 14px; }
.topic-engine { display: grid; grid-template-columns: .7fr 1.3fr; gap: 56px; align-items: center; margin-top: 84px; padding: 48px 0; border-top: 1px solid #b9cecb; border-bottom: 1px solid #b9cecb; }
.topic-copy h3 { margin: 11px 0 0; font-size: 31px; line-height: 1.2; }
.formula-grid { display: grid; grid-template-columns: 84px 20px 86px 20px minmax(170px,1fr); gap: 9px; align-items: center; }
.formula-grid span, .formula-grid b { padding: 9px 11px; background: white; font-size: 14px; }
.formula-grid span { color: var(--teal); font-weight: 900; }
.formula-grid i { color: var(--coral); font-size: 20px; font-style: normal; text-align: center; }
.formula-grid b { color: #364c51; font-weight: 700; }
.video-path { display: grid; grid-template-columns: .8fr 1.2fr; gap: 60px; align-items: start; margin-top: 78px; }
.video-path h3 { margin: 11px 0 0; font-size: 32px; line-height: 1.2; }
.video-path ol { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin: 0; padding: 0; list-style: none; }
.video-path li { position: relative; min-height: 132px; padding: 21px 16px; border-top: 2px solid var(--ink); }
.video-path li:not(:last-child)::after { position: absolute; top: -11px; right: -8px; z-index: 2; color: var(--coral); content: "→"; font-size: 22px; }
.video-path b, .video-path span { display: block; }
.video-path b { margin-bottom: 8px; }
.video-path span { color: #53636a; font-size: 13px; line-height: 1.5; }

.case-list { display: grid; grid-template-columns: 1fr 1fr; margin-top: 63px; border-top: 1px solid var(--line); }
.case-list a { display: grid; grid-template-columns: 42px 160px 1fr auto; gap: 11px; align-items: center; min-height: 74px; padding: 15px 11px; border-bottom: 1px solid var(--line); text-decoration: none; }
.case-list a:nth-child(odd) { border-right: 1px solid var(--line); }
.case-list a:hover { background: #f8f0dc; }
.case-list span { color: var(--amber-deep); font-size: 12px; font-weight: 900; }
.case-list small { color: #66757a; font-size: 13px; }
.case-list em { color: var(--teal); font-size: 12px; font-style: normal; font-weight: 800; white-space: nowrap; }

.ai-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 65px; border: 1px solid #cfbea6; background: #cfbea6; }
.ai-cards article { min-height: 277px; padding: 30px; background: #f9f3e8; }
.card-symbol { color: var(--coral); font-size: 15px; font-weight: 900; letter-spacing: .11em; }
.ai-cards h3 { margin: 23px 0 8px; font-size: 27px; }
.ai-cards p { min-height: 99px; margin: 0; color: #56656a; }
.ai-cards a { color: var(--teal); font-size: 14px; font-weight: 900; }

.section-action { display: grid; grid-template-columns: .85fr 1.15fr; gap: 76px; align-items: center; background: var(--coral); color: white; }
.section-action .kicker { color: #ffe2a6; }
.action-copy h2 { margin: 14px 0 17px; font-size: clamp(34px, 3.7vw, 55px); line-height: 1.12; }
.action-copy p:last-child { max-width: 465px; color: #ffede5; }
.action-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,.5); }
.action-list li { display: grid; grid-template-columns: 115px 1fr; gap: 25px; padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,.5); }
.action-list b { color: #ffdc86; }
.action-list span { color: white; }

footer { display: flex; justify-content: space-between; gap: 22px; padding: 29px max(24px, calc((100vw - var(--max)) / 2)); background: var(--ink); color: #c8d4d5; font-size: 13px; }
footer p { margin: 0; }

@media (max-width: 960px) {
  .site-header { grid-template-columns: auto 1fr; gap: 16px; }
  .site-header nav { display: none; }
  .header-link { justify-self: end; }
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-copy { margin: 0; padding: 78px max(24px, calc((100vw - var(--max)) / 2)) 72px; }
  .hero-visual { min-height: 350px; }
  .hero-visual img { min-height: 350px; }
  .intro-wide, .human-ai, .article-anatomy, .topic-engine, .video-path, .section-action { grid-template-columns: 1fr; gap: 32px; }
  .content-types, .pillars { grid-template-columns: repeat(2, 1fr); }
  .content-types article { min-height: 220px; }
  .workflow-steps { max-width: 680px; }
  .article-anatomy { max-width: 760px; }
  .case-list { grid-template-columns: 1fr; }
  .case-list a:nth-child(odd) { border-right: 0; }
}

@media (max-width: 680px) {
  .site-header { min-height: 64px; padding: 9px 18px; }
  .brand-mark { width: 33px; height: 33px; }
  .brand small { display: none; }
  .header-link { font-size: 12px; }
  .section { padding: 74px 20px; }
  .hero-copy { padding: 62px 20px 58px; }
  .hero h1 { font-size: 43px; }
  .hero-lede { font-size: 16px; }
  .hero-facts { flex-wrap: wrap; margin-top: 43px; }
  .hero-facts div { min-width: 110px; }
  .section-intro h2 { font-size: 37px; }
  .section-intro > p { font-size: 16px; }
  .trust-loop { grid-template-columns: 1fr; }
  .loop-arrow { transform: rotate(90deg); }
  .arrow-down { position: static; transform: rotate(90deg); }
  .inquiry-card { grid-column: auto; margin-top: 0; }
  .content-types, .pillars, .six-grid, .workflow-steps, .ai-cards { grid-template-columns: 1fr; }
  .content-types article, .pillars article, .six-grid article { min-height: auto; }
  .human-ai { margin-top: 54px; padding-top: 42px; }
  .human-ai h3, .topic-copy h3, .video-path h3 { font-size: 28px; }
  .article-anatomy { margin-top: 49px; }
  .anatomy-main, .anatomy-side { padding: 25px; }
  .anatomy-main h3 { font-size: 24px; }
  .fake-table { grid-template-columns: 1fr 1fr 1fr; font-size: 11px; }
  .cluster-map { min-height: 760px; margin-top: 40px; }
  .cluster-node { width: 145px; min-height: 92px; padding: 12px; font-size: 13px; }
  .pillar { top: 299px; width: 180px; min-height: 112px; font-size: 18px; }
  .cluster-a { top: 0; left: 0; }
  .cluster-b { top: 0; right: 0; }
  .cluster-c { bottom: 170px; left: 0; }
  .cluster-d { bottom: 170px; right: 0; }
  .cluster-e { bottom: 16px; }
  .cluster-lines { inset: 50px 4% 20px; height: 650px; }
  .formula-grid { grid-template-columns: 74px 16px 76px 16px minmax(0,1fr); gap: 4px; }
  .formula-grid span, .formula-grid b { padding: 8px 5px; font-size: 11px; }
  .video-path ol { grid-template-columns: 1fr; }
  .video-path li { min-height: auto; padding: 17px 0 18px 18px; border-left: 2px solid var(--ink); border-top: 0; }
  .video-path li:not(:last-child)::after { top: auto; right: auto; bottom: -15px; left: -9px; content: "↓"; }
  .case-list a { grid-template-columns: 28px 1fr auto; gap: 7px; }
  .case-list small { grid-column: 2 / 4; }
  .case-list em { grid-column: 3; grid-row: 1; }
  .ai-cards p { min-height: auto; margin-bottom: 20px; }
  .section-action { gap: 42px; }
  .action-list li { grid-template-columns: 83px 1fr; gap: 13px; }
  footer { display: block; padding: 23px 20px; }
  footer p + p { margin-top: 9px; }
}