:root {
  --ink: #101214;
  --paper: #f5f3eb;
  --paper-2: #ebe8dd;
  --muted: #67685f;
  --line: #d5d1c5;
  --acid: #dbff4a;
  --white: #fffef8;
  --max: 1180px;
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }

.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 999; background: var(--acid); padding: .65rem 1rem; }
.shell { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
.narrow { max-width: 820px; }
.section { padding: clamp(4rem, 7vw, 7rem) 0; }
.section-dark { background: var(--ink); color: var(--white); }
.section-tint { background: var(--paper-2); }

.site-header { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { text-decoration: none; display: inline-flex; align-items: baseline; gap: .5rem; font-weight: 900; letter-spacing: -.04em; }
.brand-mark { font-size: 1.75rem; }
.brand-word { font-size: .82rem; letter-spacing: .18em; }
.primary-nav { display: flex; gap: 1.4rem; align-items: center; font-size: .92rem; font-weight: 750; }
.primary-nav a { text-decoration: none; padding: .4rem 0; border-bottom: 2px solid transparent; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { border-bottom-color: var(--ink); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 999px; padding: .45rem .8rem; }

.hero { padding: clamp(4rem, 8vw, 7.5rem) 0; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .65fr); gap: clamp(3rem, 6vw, 6rem); align-items: center; }
.eyebrow { margin: 0 0 1rem; font-size: .76rem; font-weight: 900; letter-spacing: .19em; text-transform: uppercase; color: #6c6f65; }
.section-dark .eyebrow { color: var(--acid); }
h1, h2, h3 { line-height: 1.04; margin-top: 0; letter-spacing: -.035em; }
h1 { font-size: clamp(2.7rem, 6vw, 5.8rem); max-width: 14ch; margin-bottom: 1.25rem; }
h2 { font-size: clamp(2rem, 4vw, 3.6rem); margin-bottom: 1rem; }
h3 { font-size: 1.35rem; }
.hero-lede, .big-copy { font-size: clamp(1.15rem, 2vw, 1.45rem); }
.hero-lede { max-width: 62ch; color: #d7d7d0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin: 2rem 0 1rem; }
.microcopy { color: #a9aaa4; font-size: .92rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: .75rem 1.15rem; border-radius: 999px; text-decoration: none; font-weight: 850; }
.button-primary { background: var(--acid); color: var(--ink); }
.button-primary:hover { filter: brightness(.95); }
.button-ghost { border: 1px solid #5a5c58; color: var(--white); }
.day-zero-card { margin: 0; background: #1b1d1f; border: 1px solid #33363a; border-radius: var(--radius); overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,.35); }
.day-zero-card img { width: 100%; aspect-ratio: 3/4; object-fit: cover; object-position: center 45%; }
.day-zero-card figcaption { display: grid; gap: .15rem; padding: 1rem 1.15rem 1.2rem; }
.day-zero-card figcaption span { color: #aaa; font-size: .9rem; }

.stats-strip { background: var(--acid); color: var(--ink); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat-grid > div { padding: 1.5rem 1rem; border-right: 1px solid rgba(16,18,20,.18); }
.stat-grid > div:first-child { padding-left: 0; }
.stat-value { display: block; font-size: 2rem; line-height: 1; font-weight: 950; letter-spacing: -.04em; }
.stat-label { font-size: .8rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }

.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 3rem; margin-bottom: 2.5rem; }
.section-heading > p { max-width: 42ch; color: var(--muted); }
.rule-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.rule-card, .content-card, .panel, .research-note { background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.rule-card { padding: 1.35rem; }
.rule-card > span { display: inline-flex; margin-bottom: 2.2rem; font-weight: 950; color: #797b71; }
.rule-card p, .content-card p { color: var(--muted); }

.score-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.score-grid article { padding: 1.4rem; background: var(--white); border-right: 1px solid var(--line); }
.score-grid article:last-child { border-right: 0; }
.score-grid strong { display: block; font-size: 1.2rem; margin-bottom: .35rem; }
.score-grid span { color: var(--muted); font-size: .95rem; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 6rem); align-items: start; }
.future-stack { display: grid; gap: .8rem; }
.future-stack > div { border: 1px solid #343638; border-radius: 14px; padding: 1rem 1.1rem; display: grid; grid-template-columns: 78px 1fr; column-gap: 1rem; }
.future-stack span { grid-row: 1 / span 2; color: var(--acid); font-size: .72rem; font-weight: 900; letter-spacing: .1em; }
.future-stack strong { font-size: 1.05rem; }
.future-stack small { color: #aaa; }

.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.content-card { padding: 1.25rem; }
.card-meta { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: 2rem; color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; }
.card-meta span { font-weight: 900; }
.text-link { font-weight: 850; text-decoration-thickness: 2px; text-underline-offset: .18em; }

.research-list { border-top: 1px solid var(--line); }
.research-list article { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; padding: 1.3rem 0; border-bottom: 1px solid var(--line); }
.research-list h3 { margin: .5rem 0 0; }
.research-list p { margin: 0; color: var(--muted); }
.status { display: inline-flex; border: 1px solid currentColor; border-radius: 999px; padding: .18rem .48rem; font-size: .66rem; font-weight: 900; letter-spacing: .08em; }

.callout { background: var(--acid); }
.callout-inner { display: flex; justify-content: space-between; align-items: center; gap: 3rem; }
.callout .eyebrow { color: var(--ink); opacity: .66; }
.callout .button-primary { background: var(--ink); color: var(--white); }

.page-hero { padding: clamp(4rem, 8vw, 7rem) 0; }
.page-hero h1 { max-width: 16ch; }
.page-hero p:last-child { color: #c5c5bf; max-width: 65ch; font-size: 1.15rem; }
.timeline { position: relative; }
.timeline-entry { display: grid; grid-template-columns: 170px 1fr; gap: 2rem; padding: 2rem 0; border-bottom: 1px solid var(--line); }
.timeline-date { display: grid; align-content: start; gap: .5rem; color: var(--muted); font-size: .8rem; }
.timeline-date span { width: max-content; text-transform: uppercase; letter-spacing: .08em; font-weight: 900; }
.timeline-entry h2 { font-size: 2rem; }

.research-notebook { display: grid; gap: 1rem; }
.research-note { padding: 1.3rem; }
.research-note-top { display: flex; align-items: start; gap: 1rem; }
.research-note h2 { font-size: 1.65rem; margin-bottom: 1.3rem; }
.research-note dl { margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.research-note dl div { background: var(--paper); border-radius: 12px; padding: 1rem; }
.research-note dt { font-size: .7rem; font-weight: 900; text-transform: uppercase; letter-spacing: .09em; color: var(--muted); }
.research-note dd { margin: .35rem 0 0; }
.disclaimer-box, .launch-note { background: #fff6cf; border: 1px solid #d8c66e; border-radius: 14px; padding: 1rem 1.1rem; }
.check-list { list-style: none; padding: 0; }
.check-list li { padding: .6rem 0 .6rem 1.6rem; border-bottom: 1px solid var(--line); position: relative; }
.check-list li::before { content: '✓'; position: absolute; left: 0; font-weight: 950; }
.panel { padding: 1.5rem; }
.fine-print { font-size: .9rem; color: var(--muted); }
.prose p { margin: 0 0 1.3rem; }
blockquote { margin: 2.5rem 0; padding: 1.5rem 0 1.5rem 1.5rem; border-left: 5px solid var(--acid); font-size: 1.45rem; font-weight: 800; }

.site-footer { background: var(--ink); color: #b7b8b2; padding: 3rem 0 1.5rem; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.footer-grid p { max-width: 50ch; }
.footer-brand { color: var(--white); }
.footer-bottom { border-top: 1px solid #313335; margin-top: 2rem; padding-top: 1rem; font-size: .8rem; }

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .primary-nav { display: none; position: absolute; left: 1rem; right: 1rem; top: 64px; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 1rem; flex-direction: column; align-items: stretch; box-shadow: 0 20px 50px rgba(0,0,0,.16); }
  .primary-nav.is-open { display: flex; }
  .hero-grid, .split { grid-template-columns: 1fr; }
  .day-zero-card { max-width: 500px; }
  .rule-grid, .card-grid { grid-template-columns: 1fr; }
  .score-grid { grid-template-columns: 1fr 1fr; }
  .score-grid article:nth-child(2) { border-right: 0; }
  .score-grid article { border-bottom: 1px solid var(--line); }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .section-heading, .callout-inner { align-items: start; flex-direction: column; }
  .research-list article { grid-template-columns: 1fr; gap: .5rem; }
  .research-note dl { grid-template-columns: 1fr; }
  .timeline-entry { grid-template-columns: 1fr; gap: .5rem; }
}

@media (max-width: 520px) {
  h1 { font-size: 2.65rem; }
  .score-grid, .stat-grid { grid-template-columns: 1fr; }
  .score-grid article, .stat-grid > div { border-right: 0; }
  .stat-grid > div { padding-left: 0; border-bottom: 1px solid rgba(16,18,20,.18); }
  .future-stack > div { grid-template-columns: 1fr; }
  .future-stack span { grid-row: auto; margin-bottom: .3rem; }
  .footer-grid { grid-template-columns: 1fr; }
}

.journal-tags { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; list-style: none; }
.journal-prose { max-width: 70ch; overflow-wrap: anywhere; font-size: 1.1rem; }
.journal-prose :is(h1, h2, h3, h4, h5, h6) { max-width: none; margin: 2em 0 .7em; line-height: 1.2; }
.journal-prose h1 { font-size: 2.25rem; }
.journal-prose h2 { font-size: 1.9rem; }
.journal-prose h3 { font-size: 1.5rem; }
.journal-prose > :first-child { margin-top: 0; }
.journal-prose p { margin: 0 0 1.3rem; }
.journal-prose :is(ul, ol) { padding-left: 1.5rem; margin-bottom: 1.3rem; }
.journal-prose li + li { margin-top: .4rem; }
.journal-prose blockquote { font-size: 1.15rem; font-weight: 400; }
.journal-prose blockquote > :last-child { margin-bottom: 0; }
.journal-prose a { text-underline-offset: .18em; text-decoration-thickness: 2px; }
.journal-prose code { background: var(--paper-2); padding: .15em .3em; border-radius: 4px; font-size: .9em; }
.journal-prose pre { overflow-x: auto; padding: 1rem; background: var(--paper-2); border-radius: var(--radius); }
.journal-prose pre code { padding: 0; }
.journal-prose img { max-width: 100%; height: auto; margin-block: 1.5rem; }
.journal-prose nav { margin-top: 3rem; }