:root {
  --paper: #ffffff;
  --paper-soft: #f4f6f5;
  --paper-cool: #edf5f4;
  --ink: #15181b;
  --ink-soft: #50585e;
  --line: #d9dedd;
  --line-strong: #b8c0bf;
  --medical: #087f83;
  --medical-soft: #dcefee;
  --method: #315f86;
  --radius: 8px;
  --shell: 1180px;
  --shadow: 0 18px 44px rgba(21, 24, 27, 0.09);
  --transition: 180ms ease;
  --font-sans: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { letter-spacing: 0; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.12; letter-spacing: 0; }
h1 { font-size: 4rem; margin-bottom: 1.25rem; }
h2 { font-size: 2.45rem; margin-bottom: 1rem; }
h3 { font-size: 1.35rem; margin-bottom: 0.7rem; }
p { color: var(--ink-soft); }
::selection { background: var(--medical-soft); color: var(--ink); }

.shell { width: min(calc(100% - 48px), var(--shell)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 1000; background: var(--ink); color: white; padding: 10px 14px; border-radius: 4px; }
.skip-link:focus { top: 12px; }
.eyebrow { margin-bottom: 0.9rem; color: var(--ink); font-family: var(--font-mono); font-size: 0.75rem; font-weight: 700; text-transform: uppercase; }
.section { padding: 108px 0; }
.section-heading { max-width: 760px; margin-bottom: 48px; }
.section-heading.compact { margin-bottom: 36px; }
.section-heading > p:last-child { max-width: 680px; font-size: 1.06rem; }
.split-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; margin-bottom: 44px; }
.split-heading > div { max-width: 720px; }
.large-copy { font-size: 1.3rem; line-height: 1.65; color: var(--ink); }

.site-header { position: sticky; top: 0; z-index: 100; height: 72px; background: rgba(255, 255, 255, 0.95); border-bottom: 1px solid var(--line); }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: baseline; gap: 8px; font-weight: 800; white-space: nowrap; }
.brand-name { font-size: 1.05rem; }
.brand-lab { color: var(--medical); font-family: var(--font-mono); font-size: 0.75rem; }
.site-nav { display: flex; align-items: center; gap: 4px; }
.nav-link { min-height: 40px; display: inline-flex; align-items: center; padding: 0 12px; border-bottom: 2px solid transparent; color: var(--ink-soft); font-size: 0.9rem; font-weight: 600; }
.nav-link:hover, .nav-link:focus-visible { color: var(--ink); }
.nav-link.is-active { color: var(--ink); border-bottom-color: var(--medical); }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 10px; border: 0; background: transparent; }
.menu-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--ink); }

.hero { position: relative; height: clamp(520px, 72vh, 680px); overflow: hidden; border-bottom: 1px solid var(--line); }
.hero-media { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-content { position: relative; z-index: 2; height: 100%; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; max-width: var(--shell); }
.hero-content > * { max-width: 620px; }
.hero-lede { color: var(--ink); font-size: 1.5rem; font-weight: 650; margin-bottom: 0.7rem; }
.hero-summary { max-width: 560px; font-size: 1.04rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.3rem; }
.button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; padding: 0 18px; border: 1px solid var(--ink); border-radius: 6px; font-weight: 750; transition: transform var(--transition), background var(--transition), color var(--transition); }
.button:hover { transform: translateY(-2px); }
.button-medical { background: var(--medical); border-color: var(--medical); color: white; }
.button-dark { background: var(--ink); color: white; }
.hero-subpage { height: clamp(490px, 66vh, 620px); }
.hero-subpage .hero-content { padding-top: 30px; }
.hero-subpage h1 { max-width: 700px; }
.concept-notice { display: inline-flex; margin-top: 1rem; padding: 6px 10px; background: rgba(255,255,255,0.82); border-left: 3px solid var(--medical); color: var(--ink); font-size: 0.8rem; font-weight: 700; }

.domain-overview { background: var(--paper); }
.domain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.domain-panel { position: relative; min-height: 470px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); }
.domain-panel img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; transition: transform 400ms ease; }
.domain-panel:hover img { transform: scale(1.025); }
.domain-copy { position: relative; z-index: 2; max-width: 72%; padding: 38px; }
.domain-index { display: block; margin-bottom: 74px; font-family: var(--font-mono); font-size: 0.74rem; font-weight: 700; }
.domain-copy p { color: var(--ink); }
.domain-medical { border-top: 4px solid var(--medical); }
.domain-method { border-top: 4px solid var(--method); }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 750; }
.text-link:hover { color: var(--medical); }
.domain-method .text-link:hover { color: var(--method); }

.method-band { background: var(--ink); color: white; }
.method-band .eyebrow, .method-band h2 { color: white; }
.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid #3d4448; }
.method-grid article { padding: 32px 36px 8px 0; border-right: 1px solid #3d4448; }
.method-grid article + article { padding-left: 36px; }
.method-grid article:last-child { border-right: 0; }
.method-grid span { color: #9ca8ad; font-family: var(--font-mono); font-size: 0.75rem; }
.method-grid h3 { margin-top: 40px; color: white; }
.method-grid p { color: #c8ced1; }

.selected-work { background: var(--paper-soft); }
.note-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.note-grid > a { min-height: 250px; padding: 34px; background: white; border: 1px solid var(--line); border-radius: var(--radius); }
.note-grid > a:hover { border-color: var(--line-strong); box-shadow: var(--shadow); }
.note-domain { display: inline-block; margin-bottom: 52px; font-family: var(--font-mono); font-size: 0.75rem; font-weight: 750; }
.note-domain.medical { color: var(--medical); }
.note-domain.evidence { color: var(--method); }
.note-domain.method { color: var(--method); }

.cta-band { padding: 72px 0; background: var(--medical-soft); border-top: 1px solid #c5dedd; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.cta-inner h2 { margin-bottom: 0; max-width: 780px; }

.intro-section { background: var(--paper); }
.intro-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 80px; align-items: start; margin-bottom: 54px; }
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.metric-card { min-height: 190px; padding: 28px; border: 1px solid var(--line); border-top: 4px solid var(--medical); border-radius: var(--radius); }
.metric-card strong { display: block; margin-bottom: 42px; color: var(--medical); font-size: 1.6rem; }
.metric-card p { margin-bottom: 0; font-size: 0.93rem; }
.process-section { background: var(--paper-cool); }
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid #bcd5d3; }
.process-step { padding: 30px 28px 8px 0; border-right: 1px solid #bcd5d3; }
.process-step + .process-step { padding-left: 28px; }
.process-step:last-child { border-right: 0; }
.process-index { color: var(--medical); font-family: var(--font-mono); font-size: 0.74rem; font-weight: 750; }
.process-step h3 { margin-top: 46px; }
.mode-section { background: var(--paper); }
.mode-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.mode-card { min-height: 250px; padding: 28px; border: 1px solid var(--line); border-top: 4px solid var(--medical); border-radius: var(--radius); background: white; }
.mode-index { color: var(--medical); font-family: var(--font-mono); font-size: 0.74rem; font-weight: 750; }
.mode-card h3 { margin-top: 52px; }
.mode-card p { margin-bottom: 0; }
.remote-access-section { background: var(--medical-soft); border-block: 1px solid #c5dedd; }
.remote-access-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 80px; align-items: start; }
.remote-access-copy .button { margin-top: 14px; }
.remote-access-steps { margin: 0; padding: 0; list-style: none; counter-reset: remote-access; border-top: 1px solid #aacdca; }
.remote-access-steps li { counter-increment: remote-access; display: grid; grid-template-columns: 38px 1fr; gap: 4px 14px; padding: 22px 0; border-bottom: 1px solid #aacdca; }
.remote-access-steps li::before { content: counter(remote-access, decimal-leading-zero); grid-row: 1 / 3; color: var(--medical); font-family: var(--font-mono); font-size: 0.76rem; font-weight: 750; }
.remote-access-steps span { color: var(--ink-soft); }
.remote-access-boundary { margin-top: 48px; padding-top: 18px; border-top: 1px solid #aacdca; color: #355452; font-size: 0.86rem; }
.evidence-section { padding-block: 120px; }
.evidence-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 72px; align-items: center; }
.concept-figure { margin: 0; }
.concept-figure img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border: 1px solid var(--line); border-radius: var(--radius); }
.concept-figure figcaption { padding-top: 10px; color: var(--ink-soft); font-size: 0.78rem; }
.number-list { margin: 36px 0 0; padding: 0; list-style: none; counter-reset: evidence; }
.number-list li { counter-increment: evidence; display: grid; grid-template-columns: 32px 1fr; gap: 14px; padding: 20px 0; border-top: 1px solid var(--line); }
.number-list li::before { content: counter(evidence, decimal-leading-zero); color: var(--medical); font-family: var(--font-mono); font-size: 0.75rem; }
.number-list strong, .number-list span { grid-column: 2; }
.number-list span { color: var(--ink-soft); }
.quality-section { background: var(--paper-soft); }
.quality-grid, .privacy-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 80px; align-items: start; }
.check-list, .privacy-list { margin: 0; padding: 0; list-style: none; }
.check-list li, .privacy-list li { position: relative; padding: 17px 0 17px 30px; border-top: 1px solid var(--line); color: var(--ink); }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--medical); font-weight: 800; }
.privacy-band { padding: 90px 0; background: var(--ink); color: white; }
.privacy-band .eyebrow, .privacy-band h2 { color: white; }
.privacy-list li { border-color: #3d4448; color: #d6dcde; }
.privacy-list li::before { content: "—"; position: absolute; left: 0; color: #8ad0cc; }

.page-intro { padding: 120px 0 88px; border-bottom: 1px solid var(--line); background: var(--paper-soft); }
.page-intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: end; }
.page-intro h1 { margin-bottom: 0; }
.page-intro-grid > p, .about-mission { font-size: 1.18rem; }
.page-kicker { color: var(--medical); font-weight: 750; }
.knowledge-boundary { padding: 64px 0; background: var(--ink); color: white; }
.knowledge-boundary-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 80px; align-items: start; }
.knowledge-boundary .eyebrow, .knowledge-boundary h2 { color: white; }
.knowledge-boundary h2 { margin-bottom: 0; font-size: 2rem; }
.knowledge-boundary-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.knowledge-boundary-copy p { margin: 0; padding-top: 16px; border-top: 1px solid #3d4448; color: #c8ced1; }
.knowledge-boundary-copy strong { display: block; margin-bottom: 8px; color: white; }
.knowledge-section { background: white; }
.knowledge-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 38px; }
.knowledge-toolbar h2 { margin-bottom: 0; font-size: 1.45rem; }
.segmented-control { display: inline-flex; padding: 3px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper-soft); }
.filter-button { min-height: 38px; padding: 0 13px; border: 0; border-radius: 5px; background: transparent; color: var(--ink-soft); cursor: pointer; }
.filter-button.is-active { background: var(--ink); color: white; }
.knowledge-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: start; }
.knowledge-entry[hidden] { display: none; }
.knowledge-entry details { border: 1px solid var(--line); border-radius: var(--radius); background: white; }
.knowledge-entry summary { position: relative; min-height: 150px; display: flex; flex-direction: column; justify-content: flex-end; padding: 26px 62px 26px 26px; cursor: pointer; list-style: none; }
.knowledge-entry summary::-webkit-details-marker { display: none; }
.knowledge-meta { margin-bottom: 28px; color: var(--medical); font-family: var(--font-mono); font-size: 0.7rem; font-weight: 750; }
.knowledge-entry[data-domain="method"] .knowledge-meta { color: var(--method); }
.knowledge-entry summary strong { font-size: 1.08rem; }
.details-marker { position: absolute; right: 24px; bottom: 24px; font-size: 1.5rem; }
.knowledge-entry details[open] .details-marker { transform: rotate(45deg); }
.knowledge-body { padding: 0 26px 22px; border-top: 1px solid var(--line); }
.knowledge-body p:first-child { padding-top: 20px; }
.knowledge-body p { font-size: 0.92rem; }

.principle-section { background: var(--paper); }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.principle { min-height: 250px; padding: 32px 30px 0 0; border-right: 1px solid var(--line); }
.principle + .principle { padding-left: 30px; }
.principle:last-child { border-right: 0; }
.principle h3 { margin-top: 48px; }
.matrix-section { background: var(--paper-soft); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: white; }
.capability-table { width: 100%; border-collapse: collapse; min-width: 720px; }
.capability-table th, .capability-table td { padding: 18px 20px; text-align: left; border-bottom: 1px solid var(--line); }
.capability-table th { background: #eef1f0; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; }
.capability-table tr:last-child td { border-bottom: 0; }
.contact-section { background: var(--paper); }
.contact-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 90px; }
.contact-links { display: grid; gap: 10px; }
.contact-link { min-height: 60px; display: flex; align-items: center; gap: 14px; padding: 0 18px; border: 1px solid var(--line); border-radius: var(--radius); font-weight: 700; }
.contact-link:hover { border-color: var(--medical); color: var(--medical); }
.contact-link-icon { font-family: var(--font-mono); }
.contact-text { margin-top: 12px; }

.site-footer { padding: 72px 0 24px; background: #101315; color: white; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 0.7fr 0.9fr; gap: 60px; }
.footer-brand { margin-bottom: 14px; font-size: 1.05rem; font-weight: 800; }
.site-footer p { color: #aeb7bb; max-width: 360px; }
.site-footer nav, .footer-contact { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.site-footer a { color: #d4dadd; }
.site-footer a:hover { color: white; }
.footer-bottom { margin-top: 54px; padding-top: 20px; border-top: 1px solid #33393c; color: #858f94; font-size: 0.78rem; }

@media (max-width: 980px) {
  h1 { font-size: 3.2rem; }
  h2 { font-size: 2.1rem; }
  .domain-grid, .note-grid, .knowledge-list { grid-template-columns: 1fr; }
  .domain-panel { min-height: 420px; }
  .metrics-grid, .process-grid { grid-template-columns: 1fr 1fr; }
  .process-step:nth-child(2) { border-right: 0; }
  .process-step:nth-child(n+3) { border-top: 1px solid var(--line); }
  .intro-grid, .remote-access-grid, .evidence-grid, .quality-grid, .privacy-grid, .page-intro-grid, .knowledge-boundary-grid, .contact-grid { grid-template-columns: 1fr; gap: 42px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .shell { width: min(calc(100% - 32px), var(--shell)); }
  h1 { font-size: 2.55rem; }
  h2 { font-size: 1.85rem; }
  h3 { font-size: 1.2rem; }
  .section { padding: 76px 0; }
  .site-header { height: 64px; }
  .menu-toggle { display: block; }
  .site-nav { position: absolute; top: 64px; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; padding: 10px 16px 16px; background: white; border-bottom: 1px solid var(--line); }
  .site-nav.is-open { display: flex; }
  .nav-link { min-height: 48px; border-bottom: 0; border-left: 2px solid transparent; }
  .nav-link.is-active { border-left-color: var(--medical); }
  .hero, .hero-subpage { height: 610px; min-height: 0; }
  .hero-media { object-position: 58% center; }
  .hero-content { justify-content: flex-start; padding-top: 82px; }
  .hero-home .hero-content { padding-top: 76px; }
  .hero-lede { font-size: 1.24rem; }
  .hero-summary { max-width: 86%; }
  .hero-actions { flex-direction: column; width: 100%; max-width: 250px; }
  .button { width: 100%; }
  .domain-panel { min-height: 520px; }
  .domain-copy { max-width: 90%; padding: 26px; }
  .domain-index { margin-bottom: 48px; }
  .method-grid, .principle-grid { grid-template-columns: 1fr; }
  .method-grid article, .method-grid article + article, .principle, .principle + .principle { padding: 28px 0; border-right: 0; border-bottom: 1px solid #3d4448; }
  .principle, .principle + .principle { border-color: var(--line); }
  .method-grid article:last-child, .principle:last-child { border-bottom: 0; }
  .method-grid h3, .principle h3 { margin-top: 28px; }
  .split-heading, .cta-inner, .knowledge-toolbar { align-items: flex-start; flex-direction: column; }
  .metrics-grid, .process-grid, .mode-grid { grid-template-columns: 1fr; }
  .process-step, .process-step + .process-step { padding: 26px 0; border-right: 0; border-top: 1px solid var(--line); }
  .process-step h3 { margin-top: 28px; }
  .mode-card { min-height: 0; }
  .mode-card h3 { margin-top: 30px; }
  .concept-figure img { aspect-ratio: 1 / 1; }
  .page-intro { padding: 90px 0 64px; }
  .segmented-control { width: 100%; display: grid; grid-template-columns: 1fr 1fr; }
  .filter-button { padding-inline: 6px; font-size: 0.78rem; }
  .knowledge-boundary { padding: 56px 0; }
  .knowledge-boundary-copy { grid-template-columns: 1fr; gap: 24px; }
  .knowledge-entry summary { min-height: 138px; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
}

@media (max-width: 420px) {
  .brand-name { font-size: 0.96rem; }
  .brand-lab { font-size: 0.68rem; }
  .hero, .hero-subpage { height: 580px; }
  .hero-content { padding-top: 62px; }
  .domain-panel { min-height: 480px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}