@charset "UTF-8";

:root {
  --paper: #f6f8fb;
  --white: #fff;
  --ink: #121c2c;
  --muted: #536075;
  --line: #ced6e1;
  --blue: #334ff0;
  --acid: #d4f174;
  --gutter: clamp(1.25rem, 4.5vw, 5rem);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 1.5rem; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: .3em; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 6px; }
::selection { background: var(--acid); color: var(--ink); }
.skip-link { position: absolute; left: var(--gutter); top: -5rem; z-index: 10; padding: .8rem 1rem; background: var(--white); }
.skip-link:focus { top: 1rem; }

.site-header { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding: 1.1rem var(--gutter); min-height: 5.5rem; background: var(--paper); }
.brand { display: flex; align-items: center; gap: .65rem; font-size: 1.55rem; letter-spacing: -.05em; font-weight: 720; }
.brand:hover { text-decoration: none; }
.brand-symbol { display: grid; place-items: center; width: 2.5rem; height: 2.5rem; color: var(--paper); background: var(--ink); font-size: 1.7rem; line-height: 1; padding-bottom: .25rem; }
nav { display: flex; flex-wrap: wrap; gap: 1.8rem; font-size: .95rem; }
.header-note { font-size: .875rem; color: var(--muted); }

.hero { padding: 2.2rem var(--gutter) 0; background: var(--ink); color: var(--paper); }
.hero-meta { display: flex; justify-content: space-between; gap: 2rem; color: #b5c1d2; font-size: .875rem; }
h1 { margin: clamp(3rem, 6vw, 6rem) 0 clamp(2.8rem, 4vw, 5rem); font-size: clamp(3.3rem, 8.8vw, 10rem); line-height: .99; letter-spacing: -.067em; font-weight: 560; }
em { font-style: normal; color: var(--blue); }
h1 em { color: var(--acid); }
.hero-bottom { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(11rem, .65fr) minmax(8rem, .55fr); align-items: end; gap: 2rem; margin-bottom: 3.5rem; }
.hero-intro { margin: 0; max-width: 35rem; color: #d8e0eb; font-size: clamp(1rem, 1.45vw, 1.25rem); line-height: 1.65; }
.primary-link { width: fit-content; display: inline-block; padding: .95rem 1.3rem; background: var(--acid); color: var(--ink); font-size: .95rem; font-weight: 620; }
.primary-link:hover { background: #e4ff91; text-decoration: none; }
.primary-link:focus-visible { outline-color: var(--acid); }
.hero-index { justify-self: end; font-size: .875rem; color: #b5c1d2; }
.hero-rule { height: 1.75rem; display: grid; grid-template-columns: repeat(8, 1fr); border-top: 1px solid #4c5868; }
.hero-rule span { border-left: 1px solid #4c5868; }
.hero-rule span:last-child { border-right: 1px solid #4c5868; }

.section-grid { display: grid; grid-template-columns: minmax(9rem, 1fr) minmax(0, 3.6fr); gap: 2rem; padding: clamp(3.5rem, 7vw, 7rem) var(--gutter); }
.section-label { display: flex; gap: 1.25rem; padding-top: .65rem; font-size: .875rem; color: var(--muted); line-height: 1.5; }
.section-label > span:first-child { color: var(--blue); font-variant-numeric: tabular-nums; }
h2 { font-size: clamp(2.25rem, 4.3vw, 4.9rem); font-weight: 540; line-height: 1.07; letter-spacing: -.045em; margin: 0; }
.focus { background: var(--white); }
.focus-copy { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 3rem; margin-top: 2.5rem; }
.focus-copy p { font-size: 1.125rem; line-height: 1.7; margin: 0; }
.focus-copy .secondary-copy { color: var(--muted); }
.focus-sequence { display: flex; flex-wrap: wrap; gap: 1rem 2rem; border-top: 1px solid var(--line); margin-top: 3rem; padding-top: 1.25rem; font-size: .875rem; }
.focus-sequence small { font-size: .875rem; color: var(--blue); margin-right: .5rem; }
.frontiers { background: var(--paper); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); align-items: end; gap: 3rem; }
.section-heading p { color: var(--muted); line-height: 1.7; font-size: 1rem; margin: 0; max-width: 25rem; }
.frontier-list { margin-top: 3.5rem; border-top: 1px solid var(--line); }
.frontier-list details { border-bottom: 1px solid var(--line); }
.frontier-list summary { display: grid; grid-template-columns: 2.2rem minmax(0, 1fr) auto 1.5rem; gap: 1rem; align-items: center; padding: 1.6rem 0; cursor: pointer; list-style: none; }
.frontier-list summary::-webkit-details-marker { display: none; }
.frontier-number { font-size: .875rem; color: var(--muted); }
.frontier-title { font-size: clamp(1.25rem, 1.7vw, 1.75rem); letter-spacing: -.025em; }
.frontier-tag { font-size: .875rem; color: var(--muted); }
.toggle { position: relative; width: 1.1rem; height: 1.1rem; }
.toggle::before, .toggle::after { content: ""; position: absolute; background: var(--ink); }
.toggle::before { height: 1px; width: 100%; left: 0; top: 50%; }
.toggle::after { width: 1px; height: 100%; left: 50%; top: 0; }
details[open] .toggle::after { display: none; }
.frontier-content { padding: 0 3.2rem 1.6rem; }
.frontier-content p { font-size: 1rem; line-height: 1.7; max-width: 42rem; margin: 0; color: var(--muted); }
.principles { background: var(--white); }
.principle-list { list-style: none; margin: 3rem 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.25rem; counter-reset: principle; }
.principle-list li { border-top: 1px solid var(--line); padding-top: 1.4rem; counter-increment: principle; }
.principle-list li::before { content: "0" counter(principle); display: block; color: var(--blue); font-size: .875rem; margin-bottom: 1.5rem; }
.principle-list li > span { display: block; font-size: 1.4rem; letter-spacing: -.025em; }
.principle-list p { margin: .8rem 0 0; line-height: 1.7; color: var(--muted); font-size: 1rem; }

.closing { background: var(--blue); color: var(--white); padding: 2.5rem var(--gutter) 2rem; }
.closing-label { font-size: .875rem; }
.closing h2 { font-size: clamp(4.7rem, 19.7vw, 25rem); line-height: 1; letter-spacing: -.075em; font-weight: 600; margin: 1.5rem 0; }
.closing h2 span { color: var(--acid); }
.closing-bottom { display: flex; justify-content: space-between; gap: 1rem; align-items: center; padding-top: 1.5rem; border-top: 1px solid #97a7ff; font-size: .95rem; }
.closing-bottom p { margin: 0; }
footer { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; padding: 1.6rem var(--gutter); color: var(--muted); font-size: .875rem; }

@media (min-width: 1700px) { .site-header, .hero, .section-grid, .closing, footer { padding-left: max(var(--gutter), calc((100vw - 1550px) / 2)); padding-right: max(var(--gutter), calc((100vw - 1550px) / 2)); } }
@media (max-width: 1000px) {
  .header-note { display: none; }
  .hero-bottom { grid-template-columns: minmax(0, 1fr) auto; }
  .hero-index { display: none; }
  .section-grid { grid-template-columns: minmax(7rem, 1fr) minmax(0, 4fr); gap: 1.5rem; }
  .focus-copy, .section-heading { gap: 2rem; }
  .frontier-list summary { grid-template-columns: 1.4rem minmax(0, 1fr) 1.1rem; gap: .8rem; }
  .frontier-tag { grid-column: 2; font-size: .875rem; }
  .toggle { grid-column: 3; grid-row: 1 / span 2; }
  .frontier-content { padding-left: 2.2rem; padding-right: 2rem; }
  .principle-list { gap: 1.25rem; }
}
@media (max-width: 700px) {
  .site-header { align-items: flex-start; flex-wrap: wrap; gap: 1rem; min-height: auto; padding-top: 1rem; padding-bottom: 1rem; }
  .brand { font-size: 1.4rem; }
  nav { gap: 1.1rem; font-size: .875rem; align-self: center; }
  .hero { padding-top: 1.5rem; }
  .hero-meta { flex-wrap: wrap; gap: .5rem; font-size: .8rem; }
  .hero-meta > span:last-child { max-width: 12rem; text-align: right; }
  h1 { font-size: clamp(2.9rem, 10.5vw, 4.8rem); margin-top: 3.5rem; line-height: 1.04; letter-spacing: -.058em; }
  .hero-bottom { grid-template-columns: 1fr; gap: 1.6rem; margin-bottom: 2.3rem; }
  .hero-intro { font-size: 1rem; }
  .hero-rule { height: 1.1rem; }
  .section-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .section-label { padding-top: 0; }
  h2 { font-size: clamp(2.1rem, 7vw, 3rem); }
  .focus-copy, .section-heading { grid-template-columns: 1fr; gap: 1.5rem; }
  .focus-copy { margin-top: 1.75rem; }
  .focus-copy p { font-size: 1rem; }
  .focus-sequence { display: grid; gap: .9rem; margin-top: 2rem; }
  .frontier-list { margin-top: 2.3rem; }
  .frontier-list summary { padding: 1.3rem 0; }
  .frontier-title { font-size: 1.25rem; }
  .frontier-content { padding-right: 0; }
  .principle-list { grid-template-columns: 1fr; gap: 1.8rem; margin-top: 2.3rem; }
  .principle-list li::before { margin-bottom: 1rem; }
  .closing h2 { font-size: 19vw; margin: 2rem 0; }
  .closing-bottom { align-items: flex-start; flex-wrap: wrap; font-size: .875rem; }
  footer { display: grid; gap: .8rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }