@import url('https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&display=swap');

:root {
  --ink: #10110f;
  --paper: #f4f3ef;
  --white: #fffefa;
  --acid: #d8ff43;
  --coral: #ff6847;
  --blue: #4f65ff;
  --line: rgba(16, 17, 15, .2);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; max-width: 100%; overflow-x: hidden; }
body { margin: 0; max-width: 100%; overflow-x: hidden; background: var(--paper); color: var(--ink); font-family: Geist, Arial, sans-serif; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
.page-shell { overflow-x: hidden; width: 100%; max-width: 100%; }

.nav { width: min(1440px, calc(100% - 48px)); min-height: 76px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); }
.wordmark { color: var(--ink); font-weight: 700; font-size: 15px; text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--ink); font-size: 14px; text-decoration: none; }
.nav-action { background: var(--ink); color: var(--white) !important; padding: 12px 18px; }

.hero { width: min(1440px, calc(100% - 48px)); margin: 0 auto; min-height: calc(100vh - 76px); padding: 72px 0 96px; display: grid; grid-template-columns: minmax(0, .92fr) minmax(560px, 1.08fr); gap: clamp(48px, 6vw, 112px); align-items: center; }
.hero-copy { min-width: 0; }
.kicker, .eyebrow { margin: 0 0 20px; font-size: 12px; font-weight: 700; text-transform: uppercase; }
h1 { max-width: 72rem; margin: 0; font-size: clamp(3rem, 5vw, 5.5rem); line-height: .95; letter-spacing: 0; font-weight: 600; }
.lede { max-width: 660px; margin: 30px 0; font-size: clamp(18px, 2vw, 25px); line-height: 1.35; }
.source-line { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin: 40px 0 24px; font-size: clamp(22px, 3vw, 40px); font-weight: 700; }
.inline-image { width: 100px; height: 42px; border-radius: 999px; background: url('https://picsum.photos/seed/immediate-creative-connection/300/120') center/cover; filter: grayscale(1) contrast(1.2); }
.boundary { max-width: 560px; color: #4e504a; font-size: 14px; line-height: 1.5; }

.workbench { min-width: 0; background: var(--ink); color: var(--white); padding: clamp(22px, 3vw, 38px); box-shadow: 16px 16px 0 var(--coral); }
.workbench-head, .result-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.workbench h2 { margin: 0; font-size: clamp(26px, 3vw, 42px); letter-spacing: 0; }
.runtime { margin: 3px 0 0; color: var(--acid); font-size: 12px; font-weight: 700; }
.preset-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 28px 0 24px; border: 1px solid rgba(255,255,255,.3); }
.preset { min-height: 48px; border: 0; background: transparent; color: var(--white); }
.preset.active { background: var(--white); color: var(--ink); }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.field-grid label { position: relative; min-width: 0; color: #bebeb7; font-size: 12px; }
.field-grid input { width: 100%; min-width: 0; margin-top: 7px; padding: 13px 36px 13px 12px; border: 1px solid rgba(255,255,255,.25); border-radius: 0; background: #20211e; color: var(--white); }
.unit { position: absolute; right: 14px; bottom: 14px; color: #a7a89f; }
.prediction { margin-top: 22px; }
.prediction p { margin: 0 0 10px; font-size: 13px; }
.segmented { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.segmented button { min-height: 44px; border: 1px solid rgba(255,255,255,.3); background: transparent; color: var(--white); }
.segmented button.selected { border-color: var(--acid); background: var(--acid); color: var(--ink); }
.run { width: 100%; min-height: 54px; margin-top: 12px; border: 0; background: var(--coral); color: var(--ink); font-weight: 700; }
.result { margin-top: 18px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.2); }
.result-head p { margin: 0; font-size: 13px; line-height: 1.4; }
#result-status { color: var(--acid); font-weight: 700; }
#revision-count { white-space: nowrap; color: #a7a89f; }
.metric-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 16px 0; }
.metric-grid div { min-width: 0; padding: 14px; background: #20211e; }
.metric-grid span, .metric-grid small { display: block; color: #a7a89f; font-size: 11px; }
.metric-grid strong { display: block; margin: 5px 0; font-size: clamp(28px, 4vw, 45px); }
#result-explanation { min-height: 42px; margin: 0; color: #d5d5cf; font-size: 13px; line-height: 1.5; overflow-wrap: anywhere; }
.timeline { display: flex; gap: 4px; height: 18px; margin-top: 14px; overflow: hidden; }
.timeline span { flex: 1 1 0; min-width: 0; background: var(--blue); transform-origin: left; }
.timeline span.review { background: var(--acid); }

.marquee { overflow: hidden; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--acid); }
.marquee div { width: max-content; padding: 16px 0; font-size: 18px; font-weight: 700; animation: marquee 24s linear infinite; }
@keyframes marquee { to { transform: translateX(-50%); } }

.model-section, .accordion-section, .transfer-section { padding: 160px max(24px, calc((100vw - 1440px) / 2)); }
.chapter-copy { display: grid; grid-template-columns: .7fr 1.3fr; gap: 72px; align-items: start; }
.chapter-copy .kicker { grid-row: 1 / span 2; }
.chapter-copy h2, .accordion-intro h2, .transfer-copy h2 { max-width: 1100px; margin: 0; font-size: clamp(42px, 5vw, 76px); line-height: 1.02; letter-spacing: 0; }
.scrub-copy { max-width: 900px; margin: 30px 0 0; font-size: clamp(20px, 2.5vw, 34px); line-height: 1.4; color: #6c6d67; }
.scrub-word { opacity: .12; }

.dense-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); grid-template-rows: repeat(2, minmax(220px, auto)); grid-auto-flow: dense; margin-top: 92px; gap: 0; }
.formula-card { grid-column: span 5; min-width: 0; padding: clamp(26px, 4vw, 54px); border: 1px solid var(--ink); background: var(--white); }
.formula-card.major { grid-column: span 7; grid-row: span 2; padding: 0; overflow: hidden; }
.formula-card.contrast { background: var(--blue); color: var(--white); }
.card-image { height: 55%; min-height: 320px; overflow: hidden; }
.card-image img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.2); transform: scale(.8); transition: transform .7s ease-out; }
.formula-card.major:hover img { transform: scale(1.05); }
.formula-copy { padding: clamp(28px, 4vw, 54px); }
.formula-card h3 { margin: 0 0 18px; font-size: clamp(24px, 3vw, 42px); }
.formula-card p { margin: 0; font-size: 17px; line-height: 1.6; }
.formula-card code { display: block; margin-top: 24px; padding: 14px; overflow-wrap: anywhere; background: var(--ink); color: var(--acid); font-size: 13px; }

.accordion-section { background: var(--ink); color: var(--white); }
.accordion-intro { display: flex; justify-content: space-between; align-items: end; gap: 40px; margin-bottom: 72px; }
.horizontal-accordion { display: flex; min-height: 440px; overflow: hidden; }
.accordion-panel { flex: 1 1 0; min-width: 0; padding: 32px; border: 1px solid rgba(255,255,255,.28); background: #191a17; transition: flex .7s ease, background .4s ease; overflow: hidden; }
.accordion-panel:hover, .accordion-panel:focus, .accordion-panel.active { flex: 2.6 1 0; background: var(--coral); color: var(--ink); outline: none; }
.accordion-panel span { font-size: 12px; font-weight: 700; }
.accordion-panel h3 { margin: 120px 0 20px; font-size: clamp(30px, 4vw, 58px); }
.accordion-panel p { max-width: 480px; font-size: 18px; line-height: 1.5; opacity: 0; transform: translateY(16px); transition: .4s ease .1s; }
.accordion-panel:hover p, .accordion-panel:focus p, .accordion-panel.active p { opacity: 1; transform: translateY(0); }

.transfer-section { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(420px, .85fr); gap: 90px; background: var(--acid); }
.assessment { align-self: end; background: var(--white); border: 1px solid var(--ink); padding: clamp(24px, 4vw, 48px); }
.assessment > button:not(.export) { width: 100%; min-height: 64px; margin-bottom: 12px; padding: 16px; border: 1px solid var(--ink); background: transparent; color: var(--ink); text-align: left; }
.assessment > button:not(.export):hover, .assessment > button:not(.export).selected { background: var(--ink); color: var(--white); }
#assessment-feedback { min-height: 72px; font-size: 16px; line-height: 1.5; }
#transfer-status { font-weight: 700; }
.export { width: 100%; min-height: 54px; border: 0; background: var(--blue); color: var(--white); font-weight: 700; }
.export:disabled { background: #c4c4bd; color: #686961; cursor: not-allowed; }

footer { display: flex; justify-content: space-between; gap: 30px; padding: 48px max(24px, calc((100vw - 1440px) / 2)); background: var(--ink); color: var(--white); }
footer p { margin: 0; }
footer a { color: var(--acid); }

@media (max-width: 1050px) {
  .hero { grid-template-columns: 1fr; }
  .hero-copy { max-width: 850px; }
  .chapter-copy { grid-template-columns: 1fr; gap: 24px; }
  .chapter-copy .kicker { grid-row: auto; }
  .transfer-section { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .nav { width: calc(100% - 28px); min-height: 64px; }
  .nav-links > a:not(.nav-action) { display: none; }
  .hero { width: calc(100% - 28px); min-height: 0; padding: 46px 0 76px; gap: 36px; }
  h1 { font-size: 48px; }
  .lede { font-size: 18px; }
  .workbench { width: 100%; max-width: 100%; padding: 20px; box-shadow: 8px 8px 0 var(--coral); }
  .field-grid, .metric-grid { grid-template-columns: 1fr 1fr; }
  .workbench-head { align-items: flex-start; }
  .runtime { max-width: 100px; text-align: right; white-space: normal; }
  .model-section, .accordion-section, .transfer-section { padding: 112px 18px; }
  .dense-grid { display: block; margin-top: 56px; }
  .formula-card { width: 100%; }
  .card-image { min-height: 240px; }
  .horizontal-accordion { display: block; min-height: 0; }
  .accordion-panel { min-height: 190px; }
  .accordion-panel h3 { margin-top: 54px; }
  .accordion-panel p { opacity: 1; transform: none; overflow-wrap: anywhere; }
  .accordion-intro { display: block; }
  footer { flex-direction: column; }
}

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