:root {
  color-scheme: dark;
  --black: #09090b;
  --black-2: #111114;
  --panel: #17171b;
  --line: #34343b;
  --line-soft: #242429;
  --white: #f7f7f4;
  --muted: #aaaab3;
  --red: #ef233c;
  --red-dark: #9d1022;
  --red-soft: rgba(239, 35, 60, .14);
  --amber: #ffb703;
  --green: #57e389;
  --max: 1240px;
  --radius: 18px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--black); }
body {
  margin: 0;
  background:
    radial-gradient(circle at 82% 8%, rgba(239,35,60,.10), transparent 30rem),
    var(--black);
  color: var(--white);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}
a { color: inherit; }
button, input { font: inherit; }
canvas { display: block; width: 100%; height: 100%; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  transform: translateY(-160%);
  background: var(--white);
  color: var(--black);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
  padding: 12px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(9,9,11,.88);
  backdrop-filter: blur(18px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--white);
  font-weight: 760;
  text-decoration: none;
  letter-spacing: -.02em;
}
.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--red);
  color: var(--red);
  font-size: 13px;
  letter-spacing: .08em;
}
.site-header nav { display: flex; gap: 24px; }
.site-header nav a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}
.site-header nav a:hover,
.site-header nav a:focus-visible { color: var(--white); }

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(420px, .97fr);
  gap: clamp(40px, 7vw, 100px);
  align-items: center;
  width: min(var(--max), calc(100% - 48px));
  min-height: calc(100svh - 72px);
  margin: 0 auto;
  padding: 80px 0;
}
.eyebrow {
  margin: 0 0 14px;
  color: var(--red);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
}
.home-hero h1,
.project-title {
  margin: 0;
  font-size: clamp(58px, 7.3vw, 108px);
  line-height: .91;
  letter-spacing: -.065em;
}
.home-hero h1 span { color: var(--red); }
.hero-deck {
  max-width: 680px;
  margin: 30px 0 0;
  color: #d1d1d6;
  font-size: clamp(18px, 1.8vw, 24px);
  line-height: 1.48;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--line);
  text-decoration: none;
  font-weight: 760;
}
.button-primary { border-color: var(--red); background: var(--red); color: #fff; }
.button-primary:hover,
.button-primary:focus-visible { background: #ff3a51; }
.button-ghost:hover,
.button-ghost:focus-visible { border-color: var(--white); }
.draft-note { margin-top: 20px; color: #73737d; font-size: 12px; }
.hero-field {
  position: relative;
  min-height: 570px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, #151519, #0b0b0d 75%);
}
.hero-field::before,
.hero-field::after {
  position: absolute;
  z-index: 2;
  content: "";
  pointer-events: none;
}
.hero-field::before { inset: 0; background: linear-gradient(transparent 49.5%, rgba(255,255,255,.045) 50%, transparent 50.5%); background-size: 100% 42px; }
.hero-field::after { top: 0; right: 0; width: 9px; height: 42%; background: var(--red); }
.hero-readout {
  position: absolute;
  z-index: 3;
  right: 24px;
  bottom: 22px;
  left: 24px;
  display: grid;
  grid-template-columns: auto 1fr 42px auto 1fr;
  align-items: center;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  background: rgba(9,9,11,.82);
  font-size: 11px;
  letter-spacing: .08em;
}
.hero-readout span { color: var(--muted); }
.hero-readout strong { font-size: 13px; letter-spacing: 0; }
.hero-readout i { height: 1px; background: var(--red); }

.semester,
.projects-section,
.standards {
  width: min(var(--max), calc(100% - 48px));
  margin: 0 auto;
  padding: 110px 0;
}
.section-intro { max-width: 820px; }
.section-intro h2,
.standards h2 {
  margin: 0;
  font-size: clamp(38px, 5vw, 70px);
  line-height: 1.02;
  letter-spacing: -.045em;
}
.section-intro > p:last-child { color: var(--muted); font-size: 18px; }
.semester-track {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  margin: 62px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}
.semester-track li { position: relative; min-height: 180px; padding: 28px 18px 20px 0; border-right: 1px solid var(--line-soft); }
.semester-track li::before { position: absolute; top: -5px; left: 0; width: 9px; height: 9px; border-radius: 50%; background: var(--red); content: ""; }
.semester-track span { display: block; margin-bottom: 28px; color: var(--red); font-size: 12px; font-weight: 800; }
.semester-track strong { display: block; font-size: 17px; }
.semester-track small { display: block; margin-top: 7px; color: var(--muted); }

.projects-section { border-top: 1px solid var(--line); }
.projects-intro { display: grid; grid-template-columns: 1.1fr .9fr; gap: 80px; max-width: none; align-items: end; }
.project-list { margin-top: 62px; border-top: 1px solid var(--line); }
.project-row {
  display: grid;
  grid-template-columns: 72px minmax(250px, 1.1fr) minmax(270px, 1fr) 220px 44px;
  gap: 22px;
  align-items: center;
  min-height: 164px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background .18s ease, padding .18s ease;
}
.project-row:hover,
.project-row:focus-visible { padding-right: 16px; padding-left: 16px; background: var(--red-soft); outline: none; }
.project-number { color: var(--red); font-size: 13px; font-weight: 850; letter-spacing: .12em; }
.project-row h3 { margin: 0; font-size: clamp(25px, 2.6vw, 38px); line-height: 1.05; letter-spacing: -.035em; }
.project-row p { margin: 0; color: var(--muted); }
.method-line { display: flex; flex-wrap: wrap; gap: 7px; }
.method-line span { padding: 5px 8px; border: 1px solid #3a3a42; color: #d7d7dc; font-size: 11px; }
.project-arrow { color: var(--red); font-size: 34px; text-align: right; }

.featured-lab,
.lab-cta {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(330px, 1.5fr) auto;
  gap: 18px 34px;
  align-items: center;
  padding: 24px 28px;
  border: 1px solid var(--red);
  background: linear-gradient(110deg, rgba(239,35,60,.16), rgba(239,35,60,.035) 55%, transparent);
  color: var(--white);
  text-decoration: none;
}
.featured-lab { margin: 34px 0 14px; }
.lab-cta { margin: 18px 0 0; }
.featured-lab span,
.lab-cta span { grid-column: 1; color: var(--red); font-size: 11px; font-weight: 850; letter-spacing: .14em; }
.featured-lab strong,
.lab-cta strong { grid-column: 1; font-size: clamp(22px, 2.4vw, 34px); line-height: 1; }
.featured-lab small,
.lab-cta small { grid-column: 2; grid-row: 1 / span 2; color: #d0d0d6; font-size: 14px; line-height: 1.55; }
.featured-lab b,
.lab-cta b { grid-column: 3; grid-row: 1 / span 2; color: var(--red); font-size: 14px; white-space: nowrap; }
.featured-lab:hover,
.featured-lab:focus-visible,
.lab-cta:hover,
.lab-cta:focus-visible { background-color: var(--red-soft); outline: 2px solid var(--red); outline-offset: 3px; }

.standards { border-top: 1px solid var(--line); }
.standards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 54px; }
.standards-grid article { padding-top: 18px; border-top: 3px solid var(--red); }
.standards-grid span { color: var(--red); font-size: 13px; font-weight: 850; }
.standards-grid h3 { margin: 22px 0 10px; font-size: 24px; }
.standards-grid p { color: var(--muted); }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  padding: 42px max(24px, calc((100vw - var(--max)) / 2));
  border-top: 1px solid var(--line);
  background: #070708;
  color: var(--muted);
  font-size: 13px;
}
.site-footer div { display: flex; gap: 12px; }
.site-footer strong { color: var(--red); }
.site-footer p { max-width: 600px; margin: 0; text-align: right; }

/* Project pages */
.project-main { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }
.project-heading { padding: 54px 0 30px; }
.project-breadcrumb { display: inline-flex; gap: 10px; margin-bottom: 24px; color: var(--muted); font-size: 13px; text-decoration: none; }
.project-breadcrumb:hover { color: var(--white); }
.project-heading-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(290px, .8fr); gap: 50px; align-items: end; }
.project-index { display: block; margin-bottom: 18px; color: var(--red); font-size: 13px; font-weight: 850; letter-spacing: .15em; }
.project-title { font-size: clamp(48px, 6.2vw, 88px); }
.project-hook { margin: 0; color: #d0d0d6; font-size: clamp(18px, 2vw, 24px); }
.project-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.project-meta span { padding: 7px 10px; border: 1px solid var(--line); color: var(--muted); font-size: 12px; }

.simulation-stage { margin: 18px 0 0; border: 1px solid var(--line); background: #0c0c0e; }
.simulation-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 14px 18px; border-bottom: 1px solid var(--line); }
.simulation-toolbar strong { font-size: 13px; letter-spacing: .08em; }
.simulation-toolbar span { color: var(--muted); font-size: 12px; }
.simulation-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; min-height: 560px; }
.canvas-wrap { position: relative; min-height: 560px; overflow: hidden; background: radial-gradient(circle at 50% 50%, #17171c, #09090b 75%); }
.canvas-wrap::after { position: absolute; inset: 0; border: 1px solid rgba(255,255,255,.025); pointer-events: none; content: ""; }
.sim-side { padding: 22px; border-left: 1px solid var(--line); background: var(--black-2); }
.sim-question { margin: 0 0 20px; color: var(--white); font-size: 15px; }
.sim-controls { display: grid; gap: 18px; }
.control-group label { display: flex; justify-content: space-between; gap: 16px; color: var(--muted); font-size: 12px; }
.control-group output { color: var(--white); font-variant-numeric: tabular-nums; }
.control-group input[type="range"] { width: 100%; margin-top: 10px; accent-color: var(--red); }
.sim-actions { display: flex; gap: 8px; margin-top: 20px; }
.sim-button { flex: 1; min-height: 38px; border: 1px solid var(--line); background: transparent; color: var(--white); cursor: pointer; }
.sim-button:hover,
.sim-button:focus-visible { border-color: var(--red); }
.sim-metrics { display: grid; gap: 10px; margin-top: 24px; }
.metric { padding: 11px 0; border-top: 1px solid var(--line-soft); }
.metric span { display: block; color: var(--muted); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.metric strong { display: block; margin-top: 4px; font-size: 19px; font-variant-numeric: tabular-nums; }
.metric.good strong { color: var(--green); }

.project-content { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(300px, .75fr); gap: 90px; padding: 96px 0 120px; }
.content-kicker { margin: 0 0 10px; color: var(--red); font-size: 11px; font-weight: 850; letter-spacing: .15em; }
.project-content h2 { margin: 0; font-size: clamp(34px, 4vw, 58px); line-height: 1.04; letter-spacing: -.04em; }
.project-content h3 { margin: 0; font-size: 22px; }
.benchmark-block { margin-bottom: 70px; padding: 30px 0; border-top: 3px solid var(--red); border-bottom: 1px solid var(--line); }
.benchmark-value { margin: 26px 0 8px; color: var(--red); font-size: clamp(30px, 4vw, 54px); font-weight: 850; letter-spacing: -.04em; }
.benchmark-note { color: var(--muted); }
.source-link { display: inline-flex; margin-top: 18px; color: var(--white); font-weight: 760; text-underline-offset: 4px; }

.milestone-list { margin: 40px 0 0; padding: 0; list-style: none; counter-reset: steps; }
.milestone-list li { display: grid; grid-template-columns: 116px 1fr; gap: 26px; padding: 26px 0; border-top: 1px solid var(--line); counter-increment: steps; }
.milestone-list time { color: var(--red); font-size: 12px; font-weight: 850; }
.milestone-list h3::before { margin-right: 10px; color: #696972; content: counter(steps, decimal-leading-zero); }
.milestone-list p { margin: 8px 0 0; color: var(--muted); }
.milestone-list small { display: block; margin-top: 10px; color: #d5d5da; }

.project-aside { align-self: start; position: sticky; top: 100px; }
.aside-section { padding: 24px 0; border-top: 1px solid var(--line); }
.aside-section h3 { margin-bottom: 16px; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
.aside-list { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; color: var(--muted); font-size: 14px; }
.aside-list li { padding-left: 16px; position: relative; }
.aside-list li::before { position: absolute; left: 0; color: var(--red); content: "—"; }
.next-project { display: block; margin-top: 26px; padding: 20px; border: 1px solid var(--red); text-decoration: none; }
.next-project span { display: block; color: var(--red); font-size: 11px; letter-spacing: .1em; }
.next-project strong { display: block; margin-top: 6px; font-size: 18px; }

@media (max-width: 980px) {
  .home-hero { grid-template-columns: 1fr; }
  .hero-field { min-height: 460px; }
  .semester-track { grid-template-columns: repeat(3, 1fr); }
  .project-row { grid-template-columns: 54px 1fr 44px; }
  .project-row > p, .project-row .method-line { grid-column: 2; }
  .project-arrow { grid-column: 3; grid-row: 1 / span 3; }
  .projects-intro, .project-heading-grid, .project-content { grid-template-columns: 1fr; }
  .simulation-layout { grid-template-columns: 1fr; }
  .sim-side { border-top: 1px solid var(--line); border-left: 0; }
  .project-aside { position: static; }
}

@media (max-width: 680px) {
  .site-header { min-height: 64px; }
  .brand > span:last-child, .site-header nav a:not(:first-child) { display: none; }
  .home-hero, .semester, .projects-section, .standards, .project-main { width: min(100% - 28px, var(--max)); }
  .home-hero { min-height: auto; padding-top: 52px; }
  .home-hero h1 { font-size: clamp(52px, 16vw, 78px); }
  .hero-field { min-height: 380px; }
  .hero-readout { grid-template-columns: 1fr 1fr; }
  .hero-readout i { display: none; }
  .semester, .projects-section, .standards { padding: 78px 0; }
  .semester-track { grid-template-columns: 1fr 1fr; }
  .project-row { gap: 14px; }
  .project-row > p { display: none; }
  .featured-lab, .lab-cta { grid-template-columns: 1fr; gap: 10px; padding: 22px; }
  .featured-lab span, .featured-lab strong, .featured-lab small, .featured-lab b,
  .lab-cta span, .lab-cta strong, .lab-cta small, .lab-cta b { grid-column: 1; grid-row: auto; }
  .featured-lab b, .lab-cta b { margin-top: 6px; }
  .standards-grid { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; }
  .site-footer p { text-align: left; }
  .simulation-layout, .canvas-wrap { min-height: 470px; }
  .milestone-list li { grid-template-columns: 1fr; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}