:root {
  --ink: #102a2f;
  --ink-deep: #071a1e;
  --muted: #587076;
  --paper: #f7f8f5;
  --white: #fff;
  --line: #d9e0dc;
  --accent: #15a5a0;
  --accent-soft: #d9f1ed;
  --max: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
p, h1, h2, h3 { margin-top: 0; }
.container { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.section { padding: 120px 0; }
.skip-link { position: fixed; z-index: 100; top: 12px; left: 12px; padding: 10px 16px; color: var(--white); background: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.site-header { position: absolute; z-index: 20; inset: 0 0 auto; color: var(--white); }
.header-inner { height: 106px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid rgb(255 255 255 / 16%); }
.brand { display: inline-flex; align-items: center; gap: 13px; font-size: 12px; font-weight: 700; letter-spacing: .08em; line-height: 1.25; text-transform: uppercase; }
.brand-mark { width: 30px; height: 30px; display: grid; grid-template-columns: repeat(3, 1fr); align-items: end; gap: 3px; padding: 4px; border: 1px solid currentColor; }
.brand-mark i { display: block; background: var(--accent); height: 35%; }
.brand-mark i:nth-child(2) { height: 65%; }.brand-mark i:nth-child(3) { height: 100%; }
.main-nav { display: flex; align-items: center; gap: 36px; font-size: 14px; }
.main-nav > a:not(.nav-cta) { color: rgb(255 255 255 / 72%); transition: color .2s ease; }
.main-nav > a:hover { color: var(--white); }
.nav-cta { padding: 11px 17px; border: 1px solid rgb(255 255 255 / 40%); }
.nav-toggle { display: none; }

.hero { position: relative; min-height: 760px; color: var(--white); background: var(--ink-deep); overflow: hidden; }
.hero::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 75% 46%, rgb(21 165 160 / 14%), transparent 34%), linear-gradient(115deg, transparent 0 58%, rgb(255 255 255 / 2%) 58% 59%, transparent 59%); }
.hero-grid { position: relative; min-height: 760px; display: grid; grid-template-columns: 1.08fr .92fr; gap: 80px; align-items: center; padding-top: 106px; }
.hero-copy { max-width: 680px; }
.eyebrow, .section-index { margin-bottom: 28px; color: var(--accent); font-size: 12px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow::before { content: ""; display: inline-block; width: 28px; height: 1px; margin: 0 12px 4px 0; background: currentColor; }
h1 { margin-bottom: 28px; max-width: 760px; font-size: clamp(48px, 5.3vw, 76px); line-height: 1.06; letter-spacing: -.045em; }
.hero-lead { max-width: 620px; margin-bottom: 40px; color: rgb(255 255 255 / 68%); font-size: 20px; line-height: 1.55; }
.hero-actions { display: flex; align-items: center; gap: 32px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 28px; padding: 15px 20px; font-size: 14px; font-weight: 650; transition: background .2s, color .2s, transform .2s; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--ink-deep); background: var(--accent); }
.button-primary:hover { background: #26bab5; }
.text-link { font-size: 14px; border-bottom: 1px solid rgb(255 255 255 / 32%); }
.text-link span { margin-left: 8px; color: var(--accent); }

.system-visual { position: relative; aspect-ratio: 1; max-width: 500px; justify-self: end; width: 100%; }
.visual-orbit { position: absolute; border: 1px solid rgb(255 255 255 / 15%); border-radius: 50%; inset: 14%; }
.orbit-two { inset: 29%; border-color: rgb(21 165 160 / 40%); }
.visual-axis { position: absolute; background: rgb(255 255 255 / 12%); }
.axis-x { height: 1px; left: 5%; right: 5%; top: 50%; }.axis-y { width: 1px; top: 5%; bottom: 5%; left: 50%; }
.visual-core { position: absolute; inset: 37%; display: grid; place-content: center; text-align: center; background: var(--accent); color: var(--ink-deep); transform: rotate(45deg); }
.visual-core > * { transform: rotate(-45deg); }
.visual-core b { font-size: 26px; letter-spacing: .12em; }.visual-core small { margin-top: 5px; font-size: 8px; line-height: 1.3; text-transform: uppercase; }
.visual-node { position: absolute; display: flex; align-items: center; gap: 8px; padding: 7px 10px; color: rgb(255 255 255 / 72%); background: var(--ink-deep); border: 1px solid rgb(255 255 255 / 17%); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.visual-node span { color: var(--accent); }.node-strategy { top: 10%; left: 43%; }.node-structure { top: 57%; right: 2%; }.node-execution { bottom: 7%; left: 13%; }
.visual-caption { position: absolute; bottom: 14%; right: 8%; color: rgb(255 255 255 / 38%); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; }

h2 { margin-bottom: 26px; font-size: clamp(36px, 4vw, 58px); line-height: 1.12; letter-spacing: -.035em; }
h3 { font-size: 21px; line-height: 1.3; letter-spacing: -.02em; }
.split-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 10%; }
.definition-copy { padding-top: 56px; }
.large-copy { font-size: clamp(21px, 2.1vw, 28px); line-height: 1.45; letter-spacing: -.02em; }
.definition-copy > p:not(.large-copy) { max-width: 660px; color: var(--muted); }
.formula { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 48px; padding-top: 25px; border-top: 1px solid var(--line); font-size: 12px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.formula b { color: #9aaba7; font-weight: 400; }.formula .accent { color: var(--accent); }

.section-dark { color: var(--white); background: var(--ink); }
.section-heading { display: grid; grid-template-columns: 1.3fr .7fr; gap: 13%; align-items: end; margin-bottom: 64px; }
.section-heading h2 { margin: 0; max-width: 700px; }
.section-heading > p { margin: 0 0 8px; color: var(--muted); font-size: 18px; }
.section-dark .section-heading > p { color: rgb(255 255 255 / 55%); }
.challenge-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid rgb(255 255 255 / 18%); }
.challenge-list li { display: grid; grid-template-columns: 65px 1fr 1fr; gap: 32px; align-items: center; padding: 28px 0; border-bottom: 1px solid rgb(255 255 255 / 13%); transition: padding .2s, background .2s; }
.challenge-list li:hover { padding-left: 12px; background: rgb(255 255 255 / 2%); }
.challenge-list span { color: var(--accent); font-size: 12px; font-weight: 700; }.challenge-list h3, .challenge-list p { margin: 0; }.challenge-list p { color: rgb(255 255 255 / 52%); }

.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.principle-card { min-height: 410px; padding: 42px; border: 1px solid var(--line); display: flex; flex-direction: column; }
.principle-card + .principle-card { border-left: 0; }
.principle-card.featured { background: var(--white); }
.principle-icon { position: relative; width: 65px; height: 65px; margin-bottom: auto; color: var(--accent); }
.icon-align i { position: absolute; width: 9px; border: 1px solid currentColor; bottom: 5px; }.icon-align i:nth-child(1) { height: 23px; left: 6px; }.icon-align i:nth-child(2) { height: 42px; left: 27px; }.icon-align i:nth-child(3) { height: 56px; right: 5px; background: var(--accent-soft); }
.icon-loop { border: 1px solid currentColor; border-radius: 50%; }.icon-loop::after { content: ""; position: absolute; inset: 16px; border: 1px solid currentColor; transform: rotate(45deg); }.icon-loop i { position: absolute; background: var(--paper); width: 18px; height: 10px; }.icon-loop i:first-child { top: -2px; left: 23px; }.icon-loop i:last-child { bottom: -2px; left: 23px; }
.icon-signal { display: flex; align-items: end; gap: 6px; padding: 8px; border-bottom: 1px solid currentColor; }.icon-signal i { flex: 1; background: var(--accent-soft); border: 1px solid currentColor; }.icon-signal i:nth-child(1) { height: 35%; }.icon-signal i:nth-child(2) { height: 62%; }.icon-signal i:nth-child(3) { height: 90%; }
.card-number { margin: 45px 0 12px; color: var(--accent); font-size: 11px; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.principle-card h3 { font-size: 25px; }.principle-card > p:last-child { margin: 0; color: var(--muted); }

.ai-note { padding: 90px 0; color: var(--white); background: var(--ink-deep); }
.ai-grid { display: grid; grid-template-columns: .35fr 1fr .65fr; gap: 7%; align-items: start; }
.ai-grid h2 { font-size: clamp(32px, 3.5vw, 50px); }.ai-grid h2 span { color: rgb(255 255 255 / 35%); }.ai-grid > div:last-child { color: rgb(255 255 255 / 58%); }
.ai-thesis { color: var(--accent); font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }

.author-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 10%; align-items: center; }
.author-visual { position: relative; min-height: 510px; background: var(--accent-soft); overflow: hidden; }
.author-visual::before, .author-visual::after { content: ""; position: absolute; border: 1px solid rgb(16 42 47 / 22%); border-radius: 50%; }.author-visual::before { width: 390px; height: 390px; left: -90px; top: 50px; }.author-visual::after { width: 230px; height: 230px; right: -55px; bottom: -40px; }
.monogram { position: absolute; display: grid; place-items: center; width: 150px; height: 150px; top: 50%; left: 50%; color: var(--white); background: var(--ink); font: 300 72px Georgia, serif; transform: translate(-50%, -50%); }
.author-visual span { position: absolute; left: 30px; bottom: 28px; font-size: 10px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.author-copy > p:not(.section-index):not(.large-copy):not(.signature) { color: var(--muted); }
.signature { margin-top: 38px; padding-left: 20px; border-left: 2px solid var(--accent); font-size: 14px; font-weight: 650; }

.blog-teaser { padding: 105px 0; background: var(--white); }
.blog-inner { display: grid; grid-template-columns: 1.2fr .8fr; gap: 12%; align-items: end; }
.blog-inner h2 { margin: 0; }.coming-soon { padding: 28px 0 5px; border-top: 1px solid var(--line); }.coming-soon p { display: inline; margin-left: 10px; font-size: 18px; }.coming-soon small { display: block; margin: 10px 0 0 24px; color: var(--muted); }.pulse { display: inline-block; width: 9px; height: 9px; background: var(--accent); border-radius: 50%; }

.site-footer { padding: 70px 0 22px; color: var(--white); background: var(--ink-deep); }
.footer-main { display: grid; grid-template-columns: 1fr 1.2fr .8fr; gap: 8%; align-items: start; padding-bottom: 58px; }
.brand-footer { color: var(--white); }.footer-main > p { max-width: 360px; color: rgb(255 255 255 / 48%); margin: 0; }.footer-links { display: flex; gap: 26px; justify-content: flex-end; font-size: 14px; }.footer-links a:hover { color: var(--accent); }
.footer-meta { display: flex; justify-content: space-between; padding-top: 20px; border-top: 1px solid rgb(255 255 255 / 12%); color: rgb(255 255 255 / 35%); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; }

.legal-header { position: relative; background: var(--ink-deep); }
.legal-header .header-inner { height: 90px; }
.legal-main { min-height: 70vh; padding: 100px 0 130px; }
.legal-wrap { max-width: 800px; }
.legal-wrap h1 { color: var(--ink); font-size: clamp(46px, 6vw, 72px); }
.legal-intro { margin-bottom: 60px; color: var(--muted); font-size: 18px; }
.legal-section { padding: 30px 0; border-top: 1px solid var(--line); }
.legal-section h2 { font-size: 26px; }.legal-section h3 { margin-top: 28px; font-size: 18px; }.legal-section p, .legal-section li { color: var(--muted); }
.placeholder { display: inline-block; padding: 2px 7px; color: #81431c; background: #fff0dc; border: 1px solid #f0c891; font-weight: 700; }

@media (max-width: 900px) {
  .section { padding: 90px 0; }
  .hero-grid { grid-template-columns: 1fr; gap: 20px; padding-top: 165px; padding-bottom: 80px; }
  .hero { min-height: auto; }.system-visual { max-width: 400px; justify-self: center; }
  .split-layout, .author-grid { grid-template-columns: 1fr; }.definition-copy { padding-top: 0; }
  .section-heading { grid-template-columns: 1fr; gap: 20px; }
  .principle-grid { grid-template-columns: 1fr; }.principle-card { min-height: 330px; }.principle-card + .principle-card { border-left: 1px solid var(--line); border-top: 0; }
  .ai-grid { grid-template-columns: 1fr 1fr; }.ai-grid > .section-index { grid-column: 1 / -1; }
  .author-visual { min-height: 380px; }.blog-inner { grid-template-columns: 1fr; gap: 55px; }
}

@media (max-width: 700px) {
  .container { width: min(calc(100% - 32px), var(--max)); }
  .header-inner { height: 82px; }.main-nav { position: fixed; inset: 82px 0 0; display: flex; flex-direction: column; align-items: flex-start; padding: 45px 24px; color: var(--white); background: var(--ink-deep); visibility: hidden; opacity: 0; transition: opacity .2s; }.nav-open .main-nav { visibility: visible; opacity: 1; }
  .nav-toggle { display: grid; gap: 6px; padding: 10px 0 10px 10px; border: 0; color: inherit; background: transparent; }.nav-toggle span:not(.sr-only) { display: block; width: 26px; height: 1px; background: currentColor; transition: transform .2s; }.nav-open .nav-toggle span:nth-last-child(2) { transform: translateY(3.5px) rotate(45deg); }.nav-open .nav-toggle span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .hero-grid { min-height: auto; padding-top: 142px; }.hero-actions { align-items: flex-start; flex-direction: column; gap: 22px; }
  .system-visual { margin-top: 20px; }.visual-node { font-size: 9px; }.visual-caption { display: none; }
  .challenge-list li { grid-template-columns: 42px 1fr; gap: 12px; }.challenge-list p { grid-column: 2; }
  .ai-grid { grid-template-columns: 1fr; }.ai-grid > .section-index { grid-column: auto; }
  .footer-main { grid-template-columns: 1fr; gap: 34px; }.footer-links { justify-content: flex-start; }.footer-meta { flex-direction: column; gap: 10px; }
  .legal-main { padding: 70px 0 90px; }
}

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