:root {
  color-scheme: light;
  --ink: #14202a;
  --ink-soft: #3d4c57;
  --muted: #63717b;
  --paper: #f6f4ee;
  --surface: #fffdf8;
  --line: #d9d7cf;
  --accent: #0e7490;
  --accent-dark: #075a70;
  --accent-wash: #dceff1;
  --night: #0b1117;
  --night-soft: #121c24;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --shell: 1120px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font); font-size: 1rem; line-height: 1.65; overflow-wrap: break-word; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.shell { width: min(calc(100% - 2.5rem), var(--shell)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 10; top: .75rem; left: .75rem; transform: translateY(-160%); padding: .65rem 1rem; background: var(--surface); color: var(--ink); border: 2px solid var(--accent); text-decoration: none; font-weight: 700; }
.skip-link:focus { transform: none; }

.site-header { border-bottom: 1px solid rgba(20, 32, 42, .12); background: rgba(246, 244, 238, .96); }
.header-row { min-height: 5rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.wordmark { display: inline-flex; align-items: center; gap: .7rem; font-size: 1.02rem; font-weight: 760; letter-spacing: -.01em; text-decoration: none; }
nav { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2.2rem); }
nav a { color: var(--ink-soft); font-size: .86rem; font-weight: 650; text-decoration: none; }
nav a:hover { color: var(--accent-dark); }

.hero { padding-block: clamp(5rem, 12vw, 9.5rem); text-align: center; }
.eyebrow, .kicker { margin: 0 0 1rem; color: var(--accent-dark); font-size: .72rem; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { max-width: 900px; margin: 0 auto; font-family: var(--serif); font-size: clamp(3.2rem, 9.5vw, 7.4rem); font-weight: 400; letter-spacing: -.06em; line-height: .91; }
.hero h1 span { color: var(--accent); }
.hero-copy { max-width: 690px; margin: 2.4rem auto 0; color: var(--ink-soft); font-size: clamp(1.05rem, 2vw, 1.28rem); line-height: 1.65; }
.secondary-line { margin: 1.2rem auto 0; font-weight: 750; letter-spacing: -.01em; }
.status-pill { display: inline-flex; align-items: center; margin: 2rem auto 0; padding: .68rem 1rem; border: 1px solid var(--accent); border-radius: 999px; background: var(--accent-wash); color: var(--accent-dark); font-size: .8rem; font-weight: 750; }
.availability { max-width: 590px; margin: .9rem auto 0; color: var(--muted); font-size: .78rem; }

.section { padding-block: clamp(4.5rem, 9vw, 8rem); border-top: 1px solid var(--line); }
.promise { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(2rem, 8vw, 7rem); }
h2 { margin: 0; font-family: var(--serif); font-size: clamp(2.1rem, 5vw, 4.35rem); font-weight: 400; letter-spacing: -.04em; line-height: 1.04; }
.prose { color: var(--ink-soft); font-size: 1.08rem; }
.prose p:first-child { margin-top: 0; }
.section-heading { display: grid; grid-template-columns: .6fr 1.5fr .85fr; gap: clamp(1.5rem, 5vw, 4rem); align-items: start; margin-bottom: clamp(3rem, 7vw, 6rem); }
.section-heading > p:last-child { margin: .35rem 0 0; color: var(--muted); font-size: .9rem; }

.feature-list { border-top: 1px solid var(--line); }
.feature-row { display: grid; grid-template-columns: 4rem minmax(0, 1fr) minmax(240px, .72fr); gap: clamp(1.2rem, 4vw, 3.5rem); align-items: center; min-height: 15rem; padding-block: 2.5rem; border-bottom: 1px solid var(--line); }
.feature-number { align-self: start; padding-top: .3rem; color: var(--accent); font-family: var(--serif); font-size: 1.15rem; }
.feature-row h3 { margin: 0 0 .8rem; font-family: var(--serif); font-size: clamp(1.8rem, 3vw, 2.55rem); font-weight: 400; letter-spacing: -.03em; }
.feature-row p { max-width: 570px; margin: 0; color: var(--ink-soft); }
.diagram { display: flex; align-items: center; justify-content: space-between; gap: .45rem; font-size: .68rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.diagram span { padding: .55rem .7rem; border: 1px solid var(--line); background: var(--surface); }
.diagram i { height: 1px; flex: 1; background: var(--accent); position: relative; }
.diagram i::after { content: ""; position: absolute; right: 0; top: -3px; width: 6px; height: 6px; border-top: 1px solid var(--accent); border-right: 1px solid var(--accent); transform: rotate(45deg); }
.brief-card { width: min(100%, 310px); margin-left: auto; padding: 1.25rem; background: var(--night); color: #f5f7f8; }
.brief-label { display: block; margin-bottom: 1rem; color: #8ecbd7; font-size: .68rem; letter-spacing: .1em; text-transform: uppercase; }
.brief-line { display: block; width: 75%; height: 5px; margin: .7rem 0; background: #3a4a55; }
.brief-line.long { width: 100%; background: #7b929f; }
.brief-line.short { width: 45%; }
.brief-card small { display: block; margin-top: 1.3rem; color: #aebbc2; }
.dossier-stack { display: grid; width: min(100%, 290px); margin-left: auto; padding: 1rem 0; }
.dossier-stack span { grid-area: 1 / 1; width: 82%; padding: 1rem 1.2rem; border: 1px solid var(--line); background: var(--surface); font-size: .78rem; font-weight: 750; }
.dossier-stack span:nth-child(2) { transform: translate(1.4rem, 1.4rem); }
.dossier-stack span:nth-child(3) { transform: translate(2.8rem, 2.8rem); border-color: var(--accent); }
.lens-grid { display: grid; grid-template-columns: 1fr 1fr; width: min(100%, 310px); margin-left: auto; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.lens-grid span { padding: 1.1rem .8rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); color: var(--ink-soft); font-size: .75rem; font-weight: 700; }

.evidence-section { padding-block: clamp(4.5rem, 9vw, 8rem); background: var(--night); color: #eef2f3; }
.evidence-section .kicker { color: #8ecbd7; }
.evidence-grid { display: grid; grid-template-columns: 1.1fr .8fr; gap: clamp(2rem, 7vw, 6rem); }
.receipt { border-top: 1px solid #34434e; }
.receipt div { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid #34434e; }
.receipt span { color: #8fa0aa; font-size: .78rem; }
.receipt strong { font-size: .8rem; }
.evidence-copy { max-width: 640px; margin: 2rem 0 0; color: #b9c4ca; }

.principle-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.principle-grid article { min-height: 17rem; padding: 1.6rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.principle-mark { display: block; width: 1.4rem; height: 1.4rem; margin-bottom: 4rem; border: 1px solid var(--accent); border-radius: 50%; box-shadow: inset 0 0 0 5px var(--surface); background: var(--accent); }
.principle-grid h3 { margin: 0 0 .8rem; font-family: var(--serif); font-size: 1.3rem; font-weight: 400; }
.principle-grid p { margin: 0; color: var(--muted); font-size: .86rem; }

.workflow ol { display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; counter-reset: workflow; }
.workflow li { min-height: 13rem; padding: 1.6rem 1.6rem 1.6rem 0; border-bottom: 1px solid var(--line); counter-increment: workflow; }
.workflow li::before { content: "0" counter(workflow); display: block; margin-bottom: 2.8rem; color: var(--accent); font-family: var(--serif); }
.workflow li span { font-family: var(--serif); font-size: 1.45rem; }
.workflow li p { max-width: 230px; margin: .55rem 0 0; color: var(--muted); font-size: .85rem; }

.beta-section { padding-block: clamp(5rem, 11vw, 9rem); background: var(--accent); color: #f8ffff; text-align: center; }
.beta-section .kicker { color: #c8edf2; }
.beta-inner { max-width: 790px; }
.beta-inner > p:not(.kicker):not(.status-pill) { max-width: 660px; margin: 1.8rem auto 0; color: #d7f0f3; }
.status-pill.inverse { border-color: rgba(255,255,255,.6); background: transparent; color: #fff; }

footer { padding-block: 3.5rem; background: var(--night-soft); color: #b7c0c6; }
.footer-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 3rem; }
.footer-brand { color: #f4f7f8; }
.footer-grid p { max-width: 670px; margin: .7rem 0 0; font-size: .76rem; }

@media (max-width: 900px) {
  .section-heading { grid-template-columns: .6fr 1.4fr; }
  .section-heading > p:last-child { grid-column: 2; }
  .feature-row { grid-template-columns: 3rem 1fr; }
  .feature-row > :last-child { grid-column: 2; width: 100%; margin: 1.5rem 0 .7rem; }
  .principle-grid, .workflow ol { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .shell { width: min(calc(100% - 2rem), var(--shell)); }
  .header-row { min-height: 4.5rem; }
  nav a:not(:last-child) { display: none; }
  .hero { text-align: left; }
  .hero h1 { font-size: clamp(3.05rem, 15vw, 4.7rem); }
  .hero-copy, .secondary-line, .availability { margin-left: 0; }
  .status-pill { text-align: left; }
  .promise, .section-heading, .evidence-grid, .footer-grid { grid-template-columns: 1fr; }
  .section-heading > p:last-child { grid-column: auto; }
  .feature-row { grid-template-columns: 2.2rem minmax(0, 1fr); gap: .8rem; }
  .feature-row > :last-child { grid-column: 1 / -1; }
  .change-diagram { overflow: hidden; }
  .diagram span { padding-inline: .35rem; font-size: .58rem; }
  .principle-grid, .workflow ol { grid-template-columns: 1fr; }
  .principle-grid article { min-height: auto; }
  .principle-mark { margin-bottom: 2.4rem; }
  .workflow li { min-height: auto; }
}

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