:root {
  --canvas: #f5f5f7;
  --paper: #ffffff;
  --graphite: #1d1d1f;
  --secondary: #6e6e73;
  --line: #d8d8dc;
  --blue: #009ddc;
  --violet: #963d97;
  --red: #e03a3e;
  --orange: #f5821f;
  --yellow: #fdb827;
  --green: #61bb46;
  --shadow: 0 32px 90px rgba(29, 29, 31, 0.12);
  font-family: "Noto Sans SC", sans-serif;
  color: var(--graphite);
  background: var(--canvas);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--canvas); }
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }
.icon { display: block; flex: 0 0 auto; }

main { overflow: hidden; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 70px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 max(28px, calc((100vw - 1180px) / 2));
  background: rgba(245, 245, 247, 0.82);
  border-bottom: 1px solid rgba(29, 29, 31, 0.08);
  backdrop-filter: blur(22px) saturate(160%);
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: -0.02em; }
.brand-mark { width: 28px; display: grid; grid-template-rows: repeat(6, 2px); gap: 1px; transform: rotate(-7deg); }
.brand-mark span:nth-child(1), .rainbow-ribbon span:nth-child(1) { background: var(--green); }
.brand-mark span:nth-child(2), .rainbow-ribbon span:nth-child(2) { background: var(--yellow); }
.brand-mark span:nth-child(3), .rainbow-ribbon span:nth-child(3) { background: var(--orange); }
.brand-mark span:nth-child(4), .rainbow-ribbon span:nth-child(4) { background: var(--red); }
.brand-mark span:nth-child(5), .rainbow-ribbon span:nth-child(5) { background: var(--violet); }
.brand-mark span:nth-child(6), .rainbow-ribbon span:nth-child(6) { background: var(--blue); }
.site-header nav { display: flex; gap: 30px; font-size: 14px; color: #49494d; }
.site-header nav a:hover { color: #000; }
.public-chip { justify-self: end; padding: 7px 11px; border: 1px solid rgba(29,29,31,.14); border-radius: 999px; font: 600 11px/1 Manrope, sans-serif; letter-spacing: .08em; text-transform: uppercase; }

.hero {
  max-width: 1180px;
  min-height: 710px;
  margin: 0 auto;
  padding: 108px 0 92px;
  display: grid;
  grid-template-columns: 1.18fr .82fr;
  align-items: center;
  gap: 76px;
}
.profile-line { display: flex; align-items: center; gap: 10px; margin-bottom: 26px; font: 600 12px/1 Manrope, sans-serif; letter-spacing: .12em; color: var(--secondary); }
.profile-line .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--green); }
.hero h1 { max-width: 760px; margin: 0; font: 600 clamp(48px, 5.4vw, 76px)/1.08 Manrope, "Noto Sans SC", sans-serif; letter-spacing: -0.055em; }
.hero-lead { max-width: 650px; margin: 30px 0 0; font-size: 19px; line-height: 1.78; color: var(--secondary); text-wrap: pretty; }
.hero-actions { display: flex; align-items: center; gap: 14px; margin-top: 36px; }
.primary-action, .secondary-action { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 0 21px; border-radius: 999px; font-size: 14px; font-weight: 600; transition: transform .2s ease, background .2s ease; }
.primary-action { color: #fff; background: var(--graphite); }
.primary-action:hover { transform: translateY(-2px); background: #000; }
.secondary-action { border: 1px solid var(--line); background: rgba(255,255,255,.7); }
.secondary-action:hover { background: #fff; }
.hero-metrics { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 650px; margin-top: 34px; padding-top: 24px; border-top: 1px solid var(--line); }
.hero-metrics div { display: grid; gap: 5px; padding-right: 18px; }
.hero-metrics div + div { padding-left: 18px; border-left: 1px solid var(--line); }
.hero-metrics strong { font: 600 20px/1.1 Manrope, sans-serif; letter-spacing: -.03em; }
.hero-metrics span { color: var(--secondary); font-size: 10px; line-height: 1.45; }
.scope-note { margin-top: 22px; color: #8b8b91; font-size: 12px; }

.identity-card { position: relative; min-height: 460px; padding: 48px 42px 34px; background: linear-gradient(145deg, #ffffff 0%, #efeff2 100%); border: 1px solid rgba(255,255,255,.9); border-radius: 34px; box-shadow: var(--shadow); overflow: hidden; }
.identity-card::after { content: ""; position: absolute; width: 260px; height: 260px; right: -110px; bottom: -120px; border-radius: 50%; border: 1px solid rgba(29,29,31,.08); box-shadow: 0 0 0 32px rgba(29,29,31,.025), 0 0 0 64px rgba(29,29,31,.018); }
.rainbow-ribbon { position: absolute; inset: 0 0 auto; height: 9px; display: grid; grid-template-columns: repeat(6, 1fr); }
.identity-top { display: flex; align-items: center; gap: 18px; padding-bottom: 34px; border-bottom: 1px solid var(--line); }
.monogram { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 18px; color: #fff; background: var(--graphite); font-size: 27px; font-weight: 600; }
.identity-top div { display: grid; gap: 7px; }
.identity-top div span { font: 600 10px/1 Manrope, sans-serif; letter-spacing: .14em; color: var(--secondary); }
.identity-top strong { font-size: 23px; }
.identity-data { display: grid; gap: 0; margin: 22px 0 44px; }
.identity-data div { display: flex; justify-content: space-between; gap: 20px; padding: 15px 0; border-bottom: 1px solid rgba(29,29,31,.08); }
.identity-data dt { color: var(--secondary); font-size: 13px; }
.identity-data dd { margin: 0; font-size: 13px; font-weight: 600; text-align: right; }
.identity-foot { position: relative; z-index: 1; display: flex; align-items: center; gap: 8px; color: var(--secondary); font-size: 12px; }

.privacy-bar { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px 28px; padding: 20px; color: #55555a; background: #fff; border-block: 1px solid rgba(29,29,31,.08); font-size: 12px; }
.privacy-bar span { display: flex; align-items: center; gap: 7px; }

.demo-shell { max-width: 1180px; margin: 100px auto; padding: 54px; border-radius: 36px; color: #fff; background: #1d1d1f; box-shadow: 0 45px 100px rgba(29,29,31,.18); }
.demo-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; }
.eyebrow { display: block; margin-bottom: 14px; font: 700 11px/1 Manrope, sans-serif; letter-spacing: .15em; color: #77777d; }
.demo-head .eyebrow, .eyebrow.light { color: #98989e; }
.demo-head h2, .section-intro h2, .boundary-copy h2, .safety h2 { margin: 0; font: 600 clamp(34px, 4vw, 52px)/1.14 Manrope, "Noto Sans SC", sans-serif; letter-spacing: -.04em; }
.run-button { display: inline-flex; align-items: center; gap: 8px; min-height: 46px; padding: 0 18px; border: 0; border-radius: 999px; color: #111; background: #fff; font-size: 13px; font-weight: 700; cursor: pointer; }
.run-button:disabled { cursor: wait; opacity: .66; }
.sample-file { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 16px; margin-top: 38px; padding: 20px; border: 1px solid #3b3b3e; border-radius: 20px; background: #27272a; }
.file-badge { display: grid; place-items: center; width: 46px; height: 46px; border-radius: 14px; color: #111; background: #fff; }
.sample-file div:nth-child(2) { display: grid; gap: 5px; }
.sample-file strong { font-size: 14px; }
.sample-file span { color: #98989e; font-size: 11px; }
.sample-file .demo-mode { padding: 7px 10px; border-radius: 999px; color: #c7c7cb; background: #36363a; font-size: 10px; font-weight: 600; }
.evidence-chain { position: relative; display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; margin-top: 42px; }
.evidence-chain::before { content: ""; position: absolute; top: 22px; left: 7%; right: 7%; height: 1px; background: #444448; }
.chain-step { position: relative; z-index: 1; display: grid; justify-items: center; gap: 9px; text-align: center; color: #67676b; }
.step-signal { display: grid; place-items: center; width: 44px; height: 44px; border: 1px solid #48484c; border-radius: 50%; color: #89898f; background: #242426; font: 700 12px/1 Manrope, sans-serif; transition: all .35s ease; }
.chain-step strong { color: #8d8d91; font-size: 13px; transition: color .35s ease; }
.chain-step > span { max-width: 130px; font-size: 10px; line-height: 1.5; }
.chain-step.is-done strong { color: #fff; }
.chain-step.is-done .step-signal { color: #111; border-color: transparent; transform: scale(1.05); }
.chain-step.is-done .blue { background: var(--blue); }
.chain-step.is-done .violet { background: var(--violet); color: #fff; }
.chain-step.is-done .red { background: var(--red); color: #fff; }
.chain-step.is-done .orange { background: var(--orange); }
.chain-step.is-done .yellow { background: var(--yellow); }
.chain-step.is-done .green { background: var(--green); }
.chain-step.is-current .step-signal { box-shadow: 0 0 0 7px rgba(255,255,255,.08); }
.result-card { max-height: 0; overflow: hidden; opacity: 0; margin-top: 0; padding: 0 24px; border: 0 solid #3a3a3d; border-radius: 20px; background: #242426; transition: max-height .5s ease, opacity .4s ease, margin .4s ease, padding .4s ease, border-width .4s ease; }
.result-card.is-visible { max-height: 330px; opacity: 1; margin-top: 32px; padding: 24px; border-width: 1px; }
.result-status { display: flex; align-items: center; gap: 9px; color: #b7e6aa; font-size: 13px; font-weight: 600; }
.result-status span { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px rgba(97,187,70,.12); }
.result-card dl { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 34px; margin: 20px 0 0; }
.result-card dl div { display: grid; gap: 4px; }
.result-card dt { color: #818187; font-size: 10px; }
.result-card dd { margin: 0; font-size: 12px; }

.section { max-width: 1180px; margin: 0 auto; padding: 110px 0; }
.section-intro { display: grid; grid-template-columns: 1.1fr .9fr; gap: 70px; align-items: end; margin-bottom: 60px; }
.section-intro .eyebrow { grid-column: 1 / -1; margin-bottom: -45px; }
.section-intro p, .boundary-copy p { max-width: 500px; margin: 0; color: var(--secondary); font-size: 16px; line-height: 1.75; }
.ability-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.ability-card { position: relative; min-height: 270px; padding: 32px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255,255,255,.54); }
.ability-card h3 { margin: 34px 0 10px; font-size: 19px; }
.ability-card p { margin: 0; color: var(--secondary); font-size: 13px; line-height: 1.75; }
.ability-icon { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; color: #fff; }
.tone-1 { background: var(--blue); } .tone-2 { background: var(--violet); } .tone-3 { background: var(--red); }
.tone-4 { background: var(--orange); } .tone-5 { background: #d19a00; } .tone-6 { background: var(--green); }
.ability-index { position: absolute; top: 33px; right: 30px; color: #a2a2a8; font: 600 10px/1 Manrope, sans-serif; letter-spacing: .08em; }

.workflow-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: 28px; overflow: hidden; background: rgba(255,255,255,.45); }
.workflow-card { min-height: 235px; padding: 30px 28px; }
.workflow-card + .workflow-card { border-left: 1px solid var(--line); }
.workflow-card > span { color: #96969c; font: 700 10px/1 Manrope, sans-serif; letter-spacing: .12em; }
.workflow-card h3 { margin: 52px 0 12px; font-size: 18px; }
.workflow-card p { margin: 0; color: var(--secondary); font-size: 12px; line-height: 1.75; }
.toolchain { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 18px; border-radius: 18px; overflow: hidden; background: var(--line); }
.toolchain div { display: grid; grid-template-columns: auto auto 1fr; align-items: center; gap: 9px; padding: 18px 20px; background: #fff; }
.toolchain strong { font-size: 12px; }
.toolchain span { justify-self: end; color: var(--secondary); font-size: 10px; }

.evidence { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: center; }
.evidence-copy h2 { margin: 0; font: 600 clamp(34px, 4vw, 52px)/1.14 Manrope, "Noto Sans SC", sans-serif; letter-spacing: -.04em; }
.evidence-copy p { margin: 24px 0 0; color: var(--secondary); font-size: 14px; line-height: 1.8; }
.evidence-time { display: inline-flex; align-items: center; gap: 8px; margin-top: 28px; padding: 10px 13px; border: 1px solid var(--line); border-radius: 999px; background: #fff; color: #59595e; font: 600 10px/1 Manrope, sans-serif; }
.proof-card { padding: 36px; border: 1px solid rgba(29,29,31,.09); border-radius: 28px; background: #fff; box-shadow: 0 28px 70px rgba(29,29,31,.09); }
.proof-head { display: flex; justify-content: space-between; gap: 18px; padding-bottom: 22px; border-bottom: 1px solid var(--line); color: #5f8f51; font: 700 10px/1 Manrope, sans-serif; letter-spacing: .05em; text-transform: uppercase; }
.proof-head span { display: flex; align-items: center; gap: 7px; }
.proof-head i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 5px rgba(97,187,70,.13); }
.proof-card h3 { margin: 28px 0; font-size: 24px; line-height: 1.45; letter-spacing: -.03em; }
.proof-card dl { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin: 0; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: var(--line); }
.proof-card dl div { display: grid; gap: 6px; padding: 16px; background: #fafafa; }
.proof-card dt { color: var(--secondary); font-size: 9px; }
.proof-card dd { margin: 0; font-size: 12px; font-weight: 600; }
.proof-card > p { margin: 22px 0 0; color: var(--secondary); font-size: 11px; line-height: 1.75; }

.standards { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; align-items: start; }
.section-intro.compact { display: block; position: sticky; top: 120px; margin: 0; }
.section-intro.compact p { margin-top: 24px; }
.rule-list { border-top: 1px solid var(--line); }
.rule-row { display: grid; grid-template-columns: 70px 1fr; gap: 25px; padding: 32px 0; border-bottom: 1px solid var(--line); }
.rule-mark { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 14px; color: #fff; background: var(--graphite); font: 700 17px/1 Manrope, sans-serif; }
.rule-row h3 { margin: 2px 0 8px; font-size: 18px; }
.rule-row p { margin: 0; color: var(--secondary); font-size: 13px; line-height: 1.7; }

.boundary-section { max-width: none; margin-top: 80px; padding: 120px max(28px, calc((100vw - 1180px) / 2)); color: #fff; background: #1d1d1f; }
.boundary-copy { display: grid; grid-template-columns: 1fr .8fr; align-items: end; gap: 80px; margin-bottom: 64px; }
.boundary-copy .eyebrow { grid-column: 1 / -1; margin-bottom: -48px; }
.boundary-copy p { color: #a3a3a8; }
.boundary-columns { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid #3a3a3e; border-radius: 28px; overflow: hidden; }
.boundary-columns article { padding: 42px; }
.boundary-columns article + article { border-left: 1px solid #3a3a3e; }
.boundary-label { display: inline-flex; padding: 7px 10px; border-radius: 999px; font: 700 10px/1 Manrope, sans-serif; letter-spacing: .12em; }
.boundary-label.can { color: #c8efbd; background: rgba(97,187,70,.14); }
.boundary-label.stop { color: #ffc4c6; background: rgba(224,58,62,.14); }
.boundary-columns h3 { margin: 24px 0 22px; font-size: 23px; }
.boundary-columns ul { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; color: #b1b1b6; font-size: 13px; }
.boundary-columns li { position: relative; padding-left: 20px; }
.boundary-columns li::before { content: ""; position: absolute; left: 0; top: .55em; width: 7px; height: 7px; border-radius: 50%; background: #65656a; }

.safety { display: grid; grid-template-columns: auto 1fr; gap: 34px; align-items: start; padding-top: 120px; padding-bottom: 120px; }
.safety-seal { display: grid; place-items: center; width: 78px; height: 78px; border: 1px solid var(--line); border-radius: 24px; background: #fff; box-shadow: 0 16px 40px rgba(29,29,31,.07); }
.safety h2 { max-width: 700px; }
.safety p { max-width: 760px; margin: 24px 0 0; color: var(--secondary); line-height: 1.8; }

footer { max-width: 1180px; margin: 0 auto; padding: 34px 0 46px; display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; border-top: 1px solid var(--line); }
footer > div:first-child { display: grid; gap: 6px; }
footer strong { font-size: 15px; } footer span { color: var(--secondary); font-size: 11px; }
.footer-meta { display: flex; gap: 24px; }

:focus-visible { outline: 3px solid rgba(0,157,220,.45); outline-offset: 4px; }

@media (max-width: 1220px) {
  .hero, .section, footer { max-width: calc(100% - 56px); }
  .demo-shell { margin-inline: 28px; }
}

@media (max-width: 860px) {
  .site-header { grid-template-columns: 1fr auto; padding-inline: 20px; }
  .site-header nav { display: none; }
  .hero { min-height: auto; padding: 76px 0 70px; grid-template-columns: 1fr; gap: 48px; }
  .hero h1 { font-size: clamp(43px, 12vw, 64px); }
  .identity-card { min-height: 420px; }
  .demo-shell { padding: 34px 24px; border-radius: 26px; }
  .demo-head { align-items: flex-start; flex-direction: column; }
  .evidence-chain { grid-template-columns: repeat(3, 1fr); row-gap: 28px; }
  .evidence-chain::before { display: none; }
  .result-card dl { grid-template-columns: 1fr; }
  .section-intro, .standards, .boundary-copy { grid-template-columns: 1fr; gap: 24px; }
  .section-intro .eyebrow, .boundary-copy .eyebrow { margin: 0; }
  .ability-grid { grid-template-columns: repeat(2, 1fr); }
  .workflow-grid { grid-template-columns: repeat(2, 1fr); }
  .workflow-card:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
  .workflow-card:nth-child(4) { border-top: 1px solid var(--line); }
  .toolchain { grid-template-columns: 1fr; }
  .evidence { grid-template-columns: 1fr; gap: 42px; }
  .section-intro.compact { position: static; }
  .boundary-columns { grid-template-columns: 1fr; }
  .boundary-columns article + article { border-left: 0; border-top: 1px solid #3a3a3e; }
}

@media (max-width: 560px) {
  .public-chip { display: none; }
  .hero, .section, footer { max-width: calc(100% - 36px); }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-metrics { grid-template-columns: 1fr; gap: 16px; }
  .hero-metrics div { padding: 0; }
  .hero-metrics div + div { padding: 16px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .scope-note { line-height: 1.7; }
  .identity-card { padding: 42px 26px 28px; border-radius: 26px; }
  .demo-shell { margin: 70px 12px; padding: 28px 18px; }
  .sample-file { grid-template-columns: auto 1fr; }
  .sample-file .demo-mode { grid-column: 2; justify-self: start; }
  .evidence-chain { grid-template-columns: repeat(2, 1fr); }
  .ability-grid { grid-template-columns: 1fr; }
  .workflow-grid { grid-template-columns: 1fr; }
  .workflow-card + .workflow-card, .workflow-card:nth-child(3), .workflow-card:nth-child(4) { border-left: 0; border-top: 1px solid var(--line); }
  .toolchain div { grid-template-columns: auto 1fr; }
  .toolchain span { grid-column: 2; justify-self: start; }
  .proof-card { padding: 26px 20px; }
  .proof-card dl { grid-template-columns: 1fr; }
  .ability-card { min-height: 235px; }
  .rule-row { grid-template-columns: 54px 1fr; gap: 14px; }
  .boundary-section { padding-block: 90px; }
  .boundary-columns article { padding: 30px 24px; }
  .safety { grid-template-columns: 1fr; }
  footer { align-items: flex-start; flex-direction: column; }
  .footer-meta { align-items: flex-start; flex-direction: column; gap: 6px; }
}

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