:root {
 color-scheme: light;
 --paper: #fcfaf8;
 --paper-alt: #f5eeea;
 --ink: #191817;
 --muted: #6d6865;
 --rule: #e8ddd8;
 --cardinal: #8c1515;
 --deep-red: #651010;
 --botanical: #8c1515;
 --button-ink: #fffaf6;
 --selected: #f0e0da;
 --display: Geist, "Helvetica Neue", sans-serif;
 --body: Geist, "Helvetica Neue", sans-serif;
 --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
 --page-width: 1440px;
 --reading-width: 800px;
 --film-width: 1200px;
 --radius: 16px;
}
@font-face { font-family: Geist; src: url("/assets/fonts/geist-400.ttf") format("truetype"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: Geist; src: url("/assets/fonts/geist-500.ttf") format("truetype"); font-weight: 500; font-style: normal; font-display: swap; }
@font-face { font-family: Geist; src: url("/assets/fonts/geist-600.ttf") format("truetype"); font-weight: 600; font-style: normal; font-display: swap; }





*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 1rem/1.65 var(--body); -webkit-font-smoothing: antialiased; }
h1,h2,h3,p,figure { margin: 0; }
h1,h2,h3,.brand { font-family: var(--display); font-weight: 400; text-wrap: balance; }
h1 { font-size: clamp(2rem,1.2rem + 2.6vw,3.25rem); line-height: 1.12; letter-spacing: -.015em; }
h2 { font-size: clamp(1.6rem,2.6vw,2.1rem); line-height: 1.15; letter-spacing: -.01em; }
a { color: var(--cardinal); text-underline-offset: 4px; }
a:hover { color: var(--deep-red); }
:focus-visible { outline: 2px solid var(--cardinal); outline-offset: 4px; }
.wrap { width: min(100%,1600px); margin-inline: auto; padding-inline: clamp(1.5rem,6.5vw,6rem); }
.mast, footer, nav, .brand, .actions { display: flex; align-items: center; }
.mast { min-height: 68px; justify-content: space-between; border-bottom: 1px solid var(--rule); }
.mast, .mast nav, footer { flex-wrap: wrap; gap: .45rem 1rem; }
.hero h1, .walk, .access { overflow-wrap: anywhere; }
.brand { max-width: 100%; flex-wrap: wrap; gap: .6rem; text-decoration: none; color: var(--ink); }
.brand img { object-fit: contain; }
.brand span { font-size: 1.55rem; letter-spacing: -.01em; }
.brand b { font: 400 1rem var(--display); margin-left: .3rem; color: var(--muted); }
nav { gap: clamp(.9rem,2.4vw,1.9rem); }
nav a, .mast>.textlink { color: var(--muted); text-decoration: none; font-size: .9375rem; }
nav a:hover, .mast>.textlink:hover { text-decoration: none; }
.skip { position: absolute; top: -80px; left: 1rem; z-index: 3; }
.skip:focus { top: .5rem; background: var(--paper); }
.hero,.access { isolation: isolate; position: relative; overflow: hidden; }
.hero { padding-block: clamp(3.5rem,9vh,6rem) clamp(3rem,7vw,6rem); }
.lede { max-width: min(52ch,65%); margin-top: 1.4rem; font-size: clamp(1.1rem,1rem + .5vw,1.4rem); line-height: 1.55; color: var(--muted); }
.actions { flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.btn { display: inline-flex; align-items: center; gap: .55rem; border: 1px solid var(--cardinal); border-radius: 6px; padding: .68rem 1.25rem; color: white; background: var(--cardinal); text-decoration: none; font: 500 .9375rem/1.45 var(--body); cursor: pointer; }
.btn:hover { color: white; background: var(--deep-red); border-color: var(--deep-red); }
.btn.secondary { color: var(--ink); background: transparent; border-color: var(--rule); }
.btn.secondary:hover { border-color: var(--ink); }
.bot { position: absolute; z-index: -1; color: var(--botanical); opacity: .5; pointer-events: none; overflow: visible; }
.hero-leaves, .account-leaves { right: 0; top: clamp(2.5rem,7vw,6rem); width: clamp(360px,40vw,600px); aspect-ratio: 700/300; }
.access p { color: var(--muted); margin-top: 1rem; }
.textlink { display: inline-block; font-size: .9375rem; margin-top: 1rem; }
.mast>.textlink { margin: 0; }
.film video { display: block; width: 100%; height: auto; }
figcaption,footer>span { color: var(--muted); font-size: .875rem; }
figcaption { margin-top: .5rem; }
.access { padding-block: clamp(3.5rem,7vw,6rem); }
.access > p, #access-policy p { max-width: 55ch; }
.access .btn { margin-top: 1.5rem; }
.access-leaves { width: clamp(110px,15vw,210px); aspect-ratio: 320/380; right: 8%; bottom: -1rem; opacity: .36; }
.enrollment { min-height: 55vh; }
.enrollment h1 { max-width: 22ch; }
.enrollment h2 { margin-top: 2.5rem; }
.enrollment .account-leaves { width: min(32vw,440px); opacity: .34; }
.enrollment p { overflow-wrap: anywhere; }
footer { justify-content: space-between; border-top: 1px solid var(--rule); padding-block: 1.4rem; }
@media (max-width:900px) {
  .wrap { padding-inline: clamp(16px,5vw,4rem); }
  .hero-leaves { width: 38%; min-width: 0; }
  .access-leaves { right: 2%; opacity: .24; }
}
@media (max-width:680px) {
  .mast { min-height: 60px; }
  .brand { gap: .3rem; }
  .brand img { width: 29px; height: 33px; }
  .brand b { margin-left: .2rem; font-size: .9rem; }
  nav { gap: .8rem; } nav a { font-size: .875rem; }
  .hero { padding-top: 3.5rem; }
  .hero-leaves { top: -.6rem; right: -.7rem; width: min(47%,220px); opacity: .32; }
  .lede { max-width: 100%; }
  .access-leaves { width: 90px; bottom: .6rem; opacity: .2; }
  .enrollment .account-leaves { top: 0; width: 34%; opacity: .22; }
}
@media (max-width:420px) {
  .mast { padding-block: .65rem; }
}

.examples { --gallery-width: 1320px; padding-block: clamp(1rem, 3vw, 3rem); scroll-margin-top: 1rem; }
.walk { max-width: var(--gallery-width); margin-inline: auto; }
.walk { scroll-margin-top: 1.5rem; }
.walk-title { grid-column: 1 / -1; margin: 0 0 clamp(1rem, 2vw, 1.6rem); font-size: clamp(1.65rem, 2.8vw, 2.45rem); line-height: 1.15; }
.walk + .walk { margin-top: clamp(3.5rem, 7.5vw, 7rem); }
.walk-toolbar [role="tablist"] { display: flex; flex-wrap: wrap; align-items: flex-start; gap: .25rem; }
.walk-toolbar button {
  max-width: 100%; min-height: 2.75rem; overflow-wrap: anywhere;
  border: 0; border-radius: .35rem; padding: .48rem .7rem;
  font: 500 .9375rem/1.45 var(--body); color: var(--muted);
  background: transparent; cursor: pointer; text-align: start;
}
.walk-toolbar button:hover { color: var(--cardinal); }
.walk-toolbar button[aria-selected="true"] { color: var(--cardinal); background: #eaded7; }
.demo-description { margin: 0 0 1.05rem; }
.demo-description h3 { margin: 0; font-family: var(--display); font-weight: 400; font-size: clamp(1.4rem, 2.1vw, 1.9rem); line-height: 1.18; color: var(--ink); }
.demo-description p { max-width: 72ch; margin-top: .4rem; font-size: 1rem; }
.film { min-width: 0; }
.film video { height: auto; }
.walk { display: block; }
.walk-toolbar { margin-bottom: 24px; }

.shot-window { overflow: hidden; }

.phone-stage { width: min(100%, clamp(34rem, 78svh, 52rem)); margin-inline: auto; }
.institutions { display: flex; flex-wrap: wrap; align-items: center; gap: 1.25rem clamp(1.5rem, 3vw, 3rem); margin-top: clamp(2rem, 4vw, 3.5rem); }
.institutions a { display: flex; align-items: center; }
.institutions img { display: block; width: auto; height: auto; max-width: 9.75rem; max-height: 2.65rem; }
.institutions img[src$="ut-austin.png"] { filter: brightness(0); }
.institutions img[src$="del.png"], .institutions img[src$="ut-austin.png"] { max-height: 3.5rem; }
.institutions img[src$="hai.svg"] { width: 9.75rem; }
@media (max-width: 44rem) {
  .institutions { display: grid; grid-template-columns: repeat(2, minmax(0, 10rem)); gap: 1.25rem; }
  .institutions img { max-width: 100%; max-height: 2.35rem; }
}

body:has(.enrollment article) .wrap { width: 100%; }
.paper-links { flex-wrap: wrap; margin-top: 1rem; }
.paper-links a { color: var(--cardinal); text-decoration: underline; }

.enrollment h3 { margin-top: 1.75rem; }

.launch-film { padding-block: clamp(2rem, 5vw, 4rem); }
.launch-film video {
  display: block;
  width: 100%;
  height: auto;
  max-height: 78svh;
  margin-top: 1.5rem;
  background: black;
}

footer nav { flex-wrap: wrap; }
.privacy-note { font-size: .9375rem; }
.privacy-page { padding-block: clamp(2.5rem, 6vw, 5rem); overflow-wrap: anywhere; }
.privacy-page p { margin-top: 1rem; color: var(--muted); }
.privacy-page .policy-date { margin-block: 1rem 2rem; font-size: .9375rem; }
.privacy-page section { margin-top: 2.5rem; }
.privacy-page h2 { font-size: clamp(1.4rem, 2.3vw, 1.9rem); }

/* Hallmark · pre-emit critique: P4 H5 E4 S5 R5 V4
 * Reference: obvious.ai. Preserve Kordi bird, research content and demo sources.
 */
html, body { overflow-x: clip; }
.wrap { width: min(100%,1440px); padding-inline: clamp(20px,4vw,56px); }
h1,h2,h3 { font-weight: 500; font-style: normal; letter-spacing: -.03em; min-width: 0; overflow-wrap: anywhere; }
.mast { border: 0; min-height: 80px; }
.brand { flex-wrap: nowrap; white-space: nowrap; }
.brand span { font-family: var(--body); font-weight: 600; font-size: 1.65rem; letter-spacing: -.045em; }
.brand b { font-family: var(--body); font-size: .8rem; font-weight: 400; }
.mast nav a { white-space: nowrap; }
.mast .nav-access { color: var(--ink); border: 1px solid var(--ink); border-radius: 999px; padding: .42rem 1rem; }
.hero { text-align: center; padding-top: clamp(60px,7vw,105px); padding-bottom: 52px; }
.hero h1 { font-size: clamp(2rem,5.8vw,4.75rem); font-weight: 500; letter-spacing: -.04em; line-height: 1.12; }
.hero .lede { max-width: 40ch; margin: 1.5rem auto 0; line-height: 1.65; font-size: 1.125rem; }
.actions { justify-content: center; gap: 14px; }
.btn { background: var(--ink); border-color: var(--ink); color: var(--button-ink); border-radius: 999px; padding: .9rem 1.6rem; white-space: nowrap; }
.btn.secondary { border-color: var(--ink); }
.btn:active { transform: translateY(1px); }
.hero-leaves { width: 190px; top: 25px; opacity: .12; }

.research-stage { scroll-margin-top: 20px; }
.overview-frame { background: var(--paper-alt); padding: clamp(10px,1.5vw,20px); border-radius: 28px; }
.overview-panel[hidden] { display: none; }
.overview-panel a { display: block; border-radius: 12px; }
.overview-panel img { display: block; width: 100%; height: auto; aspect-ratio: auto; object-fit: contain; border-radius: 12px; }
.overview-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 20px; }
.overview-tabs button { border: 1px solid transparent; border-radius: 999px; padding: .6rem 1rem; font: 500 .875rem/1.4 var(--body); white-space: nowrap; background: transparent; color: var(--muted); cursor: pointer; }
.overview-tabs button:hover { color: var(--ink); background: var(--paper-alt); }
.overview-tabs button[aria-selected="true"] { color: var(--ink); border-color: var(--rule); background: var(--paper-alt); }

.research-community { text-align: center; padding-block: 60px 40px; }
.research-community > p { font-size: .9rem; color: var(--muted); }
.institutions { justify-content: center; margin-top: 28px; gap: 28px 54px; }
.institutions img { max-height: 2.35rem; }
.examples { padding-block: 80px; }
.walk { max-width: 1280px; column-gap: clamp(24px,4vw,56px); }
.walk-title { font-size: clamp(1.75rem,3.25vw,2.75rem); line-height: 1.2; max-width: none; margin-bottom: 24px; text-wrap: pretty; }
.walk + .walk { margin-top: 120px; }
.walk-toolbar button { border-radius: 999px; padding: .65rem 1rem; white-space: nowrap; font-size: .9rem; }
.walk-toolbar button[aria-selected="true"] { background: var(--ink); color: var(--button-ink); }
.film video { max-width: 100%; object-fit: contain; border-radius: 12px; }
.film .shot-window { border-radius: 12px; }
.demo-description { margin-bottom: 24px; }
.demo-description h3 { font-weight: 500; font-size: 1.375rem; line-height: 1.35; letter-spacing: -.02em; }
.demo-description p { max-width: 60ch; margin-top: 10px; }
.access:not(.enrollment) { background: var(--paper-alt); text-align: center; border-radius: 30px; width: min(calc(100% - 40px),1328px); padding-block: 90px; margin-bottom: 70px; }
.access:not(.enrollment) h2 { font-size: clamp(1.75rem,3.25vw,2.75rem); }
#access-policy p { margin-inline: auto; }
.access-leaves { opacity: .18; }
footer { padding-block: 28px; }
footer nav a { white-space: nowrap; }
@media(max-width:900px) {
 .walk { grid-template-columns: minmax(0,1fr); }
 .walk-toolbar [role="tablist"] { flex-direction: row; }
 .walk-title { margin-bottom: 22px; }
 .walk-toolbar { margin-bottom: 20px; }
 .walk + .walk { margin-top: 76px; }
}
@media(max-width:680px) {
 .mast { justify-content: center; padding-block: 18px; gap: 18px; }
 .mast nav { justify-content: center; gap: 28px; }
 .hero { padding-top: 40px; padding-bottom: 36px; }
 .hero-leaves { display: none; }
 .brand b { font-size: .76rem; }
 .btn { padding: .8rem 1.15rem; font-size: .875rem; }
 .overview-frame { border-radius: 16px; }
 .overview-tabs { gap: 4px; }
 .overview-tabs button { font-size: .75rem; padding: .55rem .6rem; }
 .research-community { padding-block: 40px 0; }
 .institutions { justify-content: center; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; }
 .institutions a { justify-content: center; }
 .institutions img { max-width: 135px; }
 .examples { padding-block: 64px; }
 .walk-toolbar button { font-size: .85rem; padding: .6rem .8rem; }
 .access:not(.enrollment) { padding-block: 60px; }
 footer { gap: 24px; justify-content: center; }
}

/* Consistent optical spacing for the research typography. */
body { font-kerning: normal; }
.hero .lede { max-width: 43ch; }
.demo-description p, .privacy-page p { max-width: 65ch; line-height: 1.65; }
.btn, .walk-toolbar button, .overview-tabs button { font-weight: 500; letter-spacing: 0; }
.brand b { letter-spacing: .015em; }
@media(max-width:680px) {
 .hero h1 { font-size: clamp(1.6rem,8vw,2.8rem); letter-spacing: -.035em; }
 .hero .lede { font-size: 1rem; }
 .demo-description h3 { font-size: 1.25rem; }
 .overview-tabs button { font-size: .75rem; padding-inline: .55rem; }
}

/* Compact product-first composition with Geist typography. */
.mast { min-height: 72px; }
.hero { padding-block: 36px 30px; }
.hero-leaves { display: none; }
h1, h2 { font-family: var(--display); font-weight: 600; }
.hero h1 { font-size: clamp(2rem, 5.4vw, 4.5rem); line-height: 1.06; font-weight: 600; letter-spacing: -.055em; }
.hero .lede { max-width: 48ch; font-size: 1.125rem; line-height: 1.5; margin-top: 18px; }
.actions { margin-top: 22px; gap: 12px; }
.btn { border-radius: 8px; padding: .7rem 1.1rem; font-size: .9375rem; }
.research-stage { width: min(100%, 1600px); padding-inline: clamp(12px, 2vw, 28px); }
.overview-panel { margin: 0; }
.overview-frame { padding: 0; background: none; border: 1px solid var(--rule); border-radius: 12px; overflow: hidden; box-shadow: 0 8px 30px #00000008; }
.overview-panel img { border-radius: 0; }
.overview-panel a { border-radius: 0; }
.walk-title { font-size: clamp(1.75rem, 3.2vw, 2.75rem); line-height: 1.15; letter-spacing: -.045em; }
.demo-description h3 { font-family: var(--body); font-weight: 500; letter-spacing: -.025em; }
.research-community { padding-block: 38px 24px; }
.examples { padding-block: 56px; }
.walk + .walk { margin-top: 80px; }
@media(max-width:680px) {
 .mast { padding-block: 14px; gap: 14px; }
 .hero { padding-block: 24px; }
 .hero h1 { font-size: clamp(1.7rem, 7.6vw, 3rem); letter-spacing: -.05em; }
 .hero .lede { font-size: 1rem; margin-top: 16px; }
 .actions { gap: 8px; margin-top: 20px; }
 .btn { padding: .7rem .9rem; font-size: .8125rem; }
 .overview-frame { border-radius: 8px; }
}

/* Cardinal accents and original redwood linework. */
.mast { border-bottom: 0; }
.brand b { color: var(--cardinal); }
.hero h1 span { color: var(--cardinal); }
.btn:not(.secondary) { background: var(--cardinal); border-color: var(--cardinal); }
.btn:not(.secondary):hover { background: var(--deep-red); border-color: var(--deep-red); }
.btn.secondary:hover { color: var(--cardinal); background: #f6e9e5; border-color: var(--cardinal); }
.mast .nav-access { color: var(--cardinal); border-color: #cba39b; }
.mast .nav-access:hover { background: #f6e9e5; }
.redwood { position: absolute; z-index: -1; pointer-events: none; object-fit: contain; width: clamp(100px, 13vw, 184px); height: auto; bottom: 16px; opacity: .25; }
.redwood-left { left: clamp(0px, 2vw, 30px); }
.redwood-right { right: clamp(0px, 2vw, 30px); transform: scaleX(-1); }
.overview-frame { border-color: #dac2ba; }
.redwood-divider { display: flex; align-items: center; justify-content: center; gap: 22px; margin: 0 auto 18px; }
.redwood-divider span { height: 1px; width: min(22vw, 200px); background: #dfc4bb; }
.redwood-divider img { width: 38px; height: 64px; opacity: .7; }
.walk-toolbar button[aria-selected="true"] { background: var(--cardinal); color: #fffaf6; }
.walk-title::before { content: ""; display: block; width: 32px; height: 2px; margin-bottom: 18px; background: var(--cardinal); }
.access:not(.enrollment) { border: 1px solid var(--rule); }
footer { border-top: 1px solid var(--rule); }
@media(max-width:680px) {
 .redwood { opacity: .12; width: 78px; bottom: 8px; }
 .redwood-left { left: -24px; }
 .redwood-right { right: -24px; }
 .redwood-divider { margin-bottom: 12px; gap: 14px; }
}

/* Navigation relies on color and borders instead of text underlines. */
.mast nav a, .mast nav a:hover, .mast nav a:focus, .mast nav a:active, .btn, .btn:hover { text-decoration: none; }

/* First-visit storytelling, followed by one-time section reveals. */
.hero-line { display: block; }
.hero h1 .hero-line-first { color: var(--ink); }
@keyframes arrive {
 from { opacity: 0; transform: translateY(24px); }
 to { opacity: 1; transform: translateY(0); }
}
@keyframes product-arrive {
 from { opacity: 0; transform: translateY(30px) scale(.97); }
 to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes foliage-arrive {
 from { opacity: 0; }
 to { opacity: .25; }
}
.hero-line, .hero .lede, .hero .actions {
 animation: arrive 700ms var(--ease-out) both;
}
.hero-line:nth-child(2) { animation-delay: 200ms; }
.hero .lede { animation-delay: 380ms; }
.hero .actions { animation-delay: 460ms; }
.research-stage .overview-panel { animation: product-arrive 800ms var(--ease-out) 540ms both; }
.hero .redwood { animation: foliage-arrive 1000ms var(--ease-out) 300ms both; }
.motion-ready .scroll-reveal {
 transition: opacity 600ms var(--ease-out), transform 700ms var(--ease-out);
}
.motion-ready .scroll-reveal:not(.is-visible) { opacity: 0; transform: translateY(28px); }
.motion-ready .scroll-reveal.is-visible { opacity: 1; transform: none; }
.institutions > a:nth-child(2) { transition-delay: 60ms; }
.institutions > a:nth-child(3) { transition-delay: 120ms; }
.institutions > a:nth-child(4) { transition-delay: 180ms; }
.motion-ready .motion-instant { transition: none; }
.btn { transition: transform 160ms var(--ease-out), background-color 160ms ease, border-color 160ms ease; }
.btn > span { transition: transform 160ms var(--ease-out); }
@media (hover: hover) and (pointer: fine) {
 .btn:hover { transform: translateY(-2px); }
 .btn:hover > span { transform: translateX(3px); }
}
.btn:active { transform: scale(.98); }
@media (max-width: 680px) {
 @keyframes foliage-arrive { from { opacity: 0; } to { opacity: .12; } }
}
@media (prefers-reduced-motion: reduce) {
 @keyframes arrive { from { opacity: 0; } to { opacity: 1; } }
 .hero-line, .hero .lede, .hero .actions, .research-stage .overview-panel {
  animation: arrive 160ms ease both;
 }
 .hero .redwood { animation: none; }
 .motion-ready .scroll-reveal { opacity: 1; transform: none; transition: opacity 160ms ease; }
 .motion-ready .scroll-reveal:not(.is-visible) { opacity: 1; transform: none; }
 .btn, .btn > span { transition: background-color 160ms ease; }
 .btn:hover, .btn:active, .btn:hover > span { transform: none; }
}
@media print {
 .motion-ready .scroll-reveal { opacity: 1 !important; transform: none !important; }
 .hero-line, .hero .lede, .hero .actions, .research-stage .overview-panel, .hero .redwood { animation: none; }
}

/* Spacious hero with a continuous cardinal highlight travelling across the letters. */
.hero { padding-block: clamp(64px, 6.5vw, 96px) clamp(60px, 6vw, 88px); }
.hero h1 { line-height: 1.16; }
.hero-line-emphasis { margin-top: 10px; }
.hero .lede { margin-top: 28px; line-height: 1.65; }
.hero .actions { margin-top: 32px; gap: 14px; }
.hero .redwood { bottom: 40px; }
.hero h1 .hero-line-first, .hero h1 .hero-line-emphasis { animation: none; }
.hero h1 .hero-word {
 display: inline-block;
 color: var(--ink);
 animation: title-word 1200ms var(--ease-out) both;
}
.hero h1 .hero-word:nth-child(2) { animation-delay: 80ms; }
.hero h1 .hero-word:nth-child(3) { animation-delay: 160ms; }
.gradient-word { display: inline-block; white-space: nowrap; }
.hero h1 .gradient-letter {
 display: inline-block;
 position: relative;
 color: #8c1515;
 animation: title-word 1100ms var(--ease-out) both;
 animation-delay: calc(240ms + var(--letter) * 35ms);
}
.hero h1 .gradient-letter::after {
 content: attr(data-letter);
 position: absolute;
 inset: 0;
 color: transparent;
 background: linear-gradient(160deg, #ed8665 0%, #d3484f 55%, #a42965 100%);
 background-clip: text;
 -webkit-background-clip: text;
 opacity: 0;
 pointer-events: none;
 animation: cardinal-wave 3800ms linear infinite;
 animation-delay: calc(900ms + var(--letter) * 120ms);
}
.hero.hero-motion-paused h1 .gradient-letter::after { animation-play-state: paused; }
@keyframes title-word {
 from { opacity: 0; transform: translateY(.6em); }
 to { opacity: 1; transform: translateY(0); }
}
@keyframes cardinal-wave {
 0%, 100% { opacity: 0; }
 15% { opacity: .2; }
 30% { opacity: .65; }
 45%, 55% { opacity: 1; }
 70% { opacity: .65; }
 85% { opacity: .2; }
}
@media (max-width:680px) {
 .hero { padding-block: 48px 52px; }
 .hero h1 { line-height: 1.2; }
 .hero-line-emphasis { margin-top: 8px; }
 .hero .lede { margin-top: 24px; }
 .hero .actions { margin-top: 26px; }
 .hero .redwood { bottom: 24px; }
}
@media (prefers-reduced-motion: reduce) {
 .hero h1 .hero-word, .hero h1 .gradient-letter { animation: arrive 160ms ease both; }
 .hero h1 .gradient-letter::after { animation: none; opacity: .4; }
}
@media (forced-colors: active) {
 .hero h1 .gradient-letter { color: CanvasText; }
 .hero h1 .gradient-letter::after { display: none; }
}
@media print {
 .hero h1 .hero-word, .hero h1 .gradient-letter { animation: none; }
 .hero h1 .gradient-letter::after { display: none; }
}

/* Shared chrome and editorial pages use the same research theme. */
.wrap { max-width: var(--page-width); }
.mast { min-height: 80px; }
.mast .brand { flex-shrink: 0; }
.mast nav a { font-size: .875rem; }
.mast nav a, footer nav a { min-height: 44px; display: inline-flex; align-items: center; }
.mast .nav-access { min-height: 38px; }
footer { border: 0; padding-block: 32px 48px; }
footer .brand span { font-size: 1.25rem; }
footer .brand b { font-size: .75rem; }
footer .brand img { width: 28px; height: 28px; }
footer nav { gap: 24px; }
footer nav a { font-size: .8125rem; }
.interior-page h1 { font-size: clamp(2rem, 4.5vw, 3.5rem); line-height: 1.12; letter-spacing: -.045em; }
.interior-page .mast { justify-content: space-between; }
.interior-page .mast .brand img { width: 34px; height: 34px; }
.interior-page .mast .brand span { font-size: 1.5rem; }
.interior-page .mast .brand b { font-size: .75rem; }
.interior-page .textlink { text-decoration: none; }
.launch-film { max-width: var(--film-width); padding-block: 48px 48px; }
.film-heading { text-align: center; margin-bottom: 36px; }
.film-heading h1 { margin-top: 0; }
.film-heading h1 span { color: var(--cardinal); }
.film-heading > p:last-child { color: var(--muted); margin-top: 16px; font-size: 1rem; }
.cinema-frame { position: relative; aspect-ratio: 16 / 9; overflow: hidden; border-radius: var(--radius); background: var(--deep-red); box-shadow: 0 16px 48px #65101012; }
.launch-film video { display: block; width: 100%; height: 100%; max-height: none; margin: 0; object-fit: contain; background: #191817; }
.film-cover { position: absolute; inset: 0; z-index: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 24px; width: 100%; border: 0; padding: 24px; cursor: pointer; background: radial-gradient(ellipse at 50% 20%, #9c3835, var(--deep-red) 78%); color: var(--button-ink); font-family: var(--body); }
.film-cover[hidden] { display: none; }
.film-cover:focus-visible { outline: 3px solid var(--button-ink); outline-offset: -8px; }
.film-bird { filter: brightness(0) invert(1); opacity: .9; }
.film-cover-title { position: relative; font-size: clamp(1.5rem, 4vw, 3.5rem); font-weight: 500; letter-spacing: -.045em; line-height: 1.18; text-align: center; }
.film-play { display: inline-flex; align-items: center; gap: 12px; border-radius: 999px; padding: 12px 20px; background: var(--button-ink); color: var(--deep-red); font-size: .875rem; font-weight: 500; transition: transform 160ms var(--ease-out); }
.film-duration { opacity: .65; font-size: .75rem; }
.film-tree { position: absolute; bottom: 0; width: 22%; opacity: .13; filter: brightness(0) invert(1); pointer-events: none; }
.film-tree-left { left: 4%; }
.film-tree-right { right: 4%; transform: scaleX(-1); }
#playback-error { margin-top: 20px; color: var(--cardinal); }
@media (hover: hover) and (pointer: fine) { .film-cover:hover .film-play { transform: scale(1.04); } }
.film-heading { animation: arrive 700ms var(--ease-out) both; }
/* Keep the native video outside transformed animation layers. */
@keyframes film-cover-arrive { from { opacity: 0; } to { opacity: 1; } }
.film-cover { animation: film-cover-arrive 600ms var(--ease-out) 120ms backwards; }
.privacy-page, .enrollment { max-width: var(--reading-width); padding-block: 64px 80px; }
.enrollment { min-height: 65vh; }
.enrollment:has(article) { max-width: 960px; }
.enrollment h1 { max-width: 18ch; }
.enrollment > p { max-width: 52ch; margin-top: 24px; font-size: 1.0625rem; line-height: 1.7; }
.enrollment > .privacy-note { font-size: .875rem; max-width: 58ch; }
.enrollment .btn { margin-top: 28px; }
.account-redwood { position: absolute; z-index: -1; width: 140px; right: 12px; bottom: 24px; opacity: .12; pointer-events: none; }
.enrollment article { margin-top: 48px; }
.enrollment article h2 { font-size: clamp(1.65rem, 3vw, 2.25rem); max-width: 24ch; }
.enrollment article p { max-width: 68ch; line-height: 1.8; }
.enrollment article h3 { font-size: 1.125rem; font-weight: 500; margin-top: 32px; }
.paper-links { gap: 24px; margin-top: 28px; flex-wrap: wrap; }
.privacy-page p { font-size: 1rem; line-height: 1.8; }
.privacy-page .policy-date { font-size: .8125rem; margin-block: 16px 32px; }
.privacy-page section { margin-top: 40px; }
.privacy-page h2 { font-size: 1.375rem; font-weight: 500; letter-spacing: -.025em; }
@media (max-width:680px) {
 .mast { min-height: 72px; padding-block: 16px; }
 .interior-page .mast { gap: 16px; }
 .interior-page .mast nav { gap: 16px; }
 .launch-film { padding-block: 32px; padding-inline: 16px; }
 .film-heading { margin-bottom: 28px; }
 .film-heading > p:last-child { max-width: 30ch; margin-inline: auto; font-size: .9375rem; }
 .cinema-frame { border-radius: 12px; }
 .film-cover { gap: 14px; padding: 16px; }
 .film-bird { width: 28px; height: 28px; }
 .film-cover-title { font-size: clamp(1.25rem, 5vw, 2rem); }
 .film-play { padding: 10px 16px; gap: 8px; font-size: .8125rem; }
 .privacy-page, .enrollment { padding-block: 40px 56px; }
 .account-redwood { width: 100px; }
 footer { padding-block: 24px 72px; gap: 12px 24px; }
 footer nav { justify-content: center; flex-wrap: wrap; gap: 16px; }
}
@media (max-width:440px) {
 .interior-page .mast { justify-content: center; }
 .interior-page .mast nav { gap: 24px; }
 .film-bird { display: none; }
}
@media (prefers-reduced-motion: reduce) {
 .film-heading { animation: arrive 160ms ease both; }
 .film-cover { animation: none; }
 .film-cover:hover .film-play { transform: none; }
}

/* Kordi's email registration preview shares the homepage type and colors. */
.registration { max-width: 560px; min-height: auto; padding: 48px 32px 56px; overflow: visible; }
.registration h1 { max-width: none; text-align: center; font-size: clamp(2rem, 3.5vw, 2.75rem); }
.registration > .registration-intro { margin: 16px auto 32px; text-align: center; font-size: 1rem; }
.registration .account-redwood { width: 180px; right: -180px; bottom: 68px; opacity: .14; }
.registration-form { display: grid; gap: 20px; }
.registration-field { display: grid; gap: 8px; }
.registration-field label { font-size: .875rem; font-weight: 500; }
.registration-field input { width: 100%; min-width: 0; height: 48px; border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px; background: var(--paper); color: var(--ink); font: 400 1rem var(--body); transition: border-color 160ms ease; }
.registration-field input:hover { border-color: var(--muted); }
.registration-field input:focus { outline: 2px solid var(--cardinal); outline-offset: 2px; border-color: var(--cardinal); }
.registration-field .field-help { font-size: .8125rem; line-height: 1.55; margin: 0; }
.registration-form .btn { margin-top: 4px; min-height: 48px; justify-content: center; border-radius: 8px; }
.registration-form .btn:disabled { opacity: .5; cursor: not-allowed; }
.registration-form .registration-preview { font-size: .8125rem; text-align: center; margin: -4px 0 0; }
.registration-form .registration-status { margin: 0; padding: 16px; border-radius: 8px; background: var(--selected); color: var(--deep-red); font-size: .875rem; }
.registration-back { display: block; width: fit-content; margin: 28px auto 0; color: var(--muted); font-size: .875rem; text-decoration: none; }
@media (max-width: 920px) { .registration .account-redwood { display: none; } }
@media (max-width: 680px) {
 .registration { padding: 32px 24px 40px; }
 .registration h1 { font-size: 2rem; }
}

/* Account navigation and product privacy share the research visual system. */
.nav-accounts { display: inline-flex; align-items: center; gap: 12px; }
.mast .nav-login, .mast .nav-signup { min-height: 44px; justify-content: center; padding: 8px 20px; text-decoration: none; color: var(--ink); white-space: nowrap; }
.mast .nav-login { background: var(--paper-alt); border-radius: 12px; }
.mast .nav-signup { border: 1.5px solid var(--ink); border-radius: 999px; }
.mast .nav-login:hover { color: var(--cardinal); background: var(--selected); }
.mast .nav-signup:hover { color: var(--cardinal); border-color: var(--cardinal); }
.registration > .account-switch { margin: 24px 0 0; text-align: center; font-size: .875rem; }
.registration > .account-privacy { margin: 16px 0 0; text-align: center; font-size: .8125rem; }
.account-switch a, .account-privacy a { text-decoration: none; }
.policy-layout { max-width: 1200px; display: grid; grid-template-columns: 210px minmax(0, 1fr); column-gap: 64px; padding-block: 64px 80px; }
.policy-heading { grid-column: 2; margin-bottom: 48px; }
.policy-heading > p { color: var(--muted); margin-top: 16px; }
.policy-heading .policy-date { margin-top: 24px; font-size: .8125rem; }
.policy-navigation { align-self: start; position: sticky; top: 32px; }
.policy-navigation > span { display: block; font-size: .875rem; font-weight: 500; margin-bottom: 16px; }
.policy-navigation nav { display: flex; flex-direction: column; align-items: stretch; gap: 4px; }
.policy-navigation a { padding: 6px 0; font-size: .8125rem; line-height: 1.5; }
.policy-navigation a:hover { color: var(--cardinal); }
.policy-copy.privacy-page { max-width: none; min-width: 0; padding: 0; }
.policy-copy section:first-child { margin-top: 0; }
.policy-copy h2 { scroll-margin-top: 32px; }
.policy-copy h3 { font-size: 1rem; font-weight: 500; margin-top: 24px; }
.policy-copy ul { margin: 16px 0 0; padding-left: 22px; color: var(--muted); line-height: 1.8; }
.policy-copy li + li { margin-top: 8px; }
.policy-copy a { overflow-wrap: anywhere; }
@media (max-width: 900px) {
 .policy-layout { grid-template-columns: minmax(0, 1fr); max-width: 800px; gap: 0; padding-block: 40px 56px; }
 .policy-heading { grid-column: 1; margin-bottom: 32px; }
 .policy-navigation { position: static; margin-bottom: 40px; }
 .policy-navigation nav { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
}
@media (max-width: 680px) {
 .mast, .interior-page .mast { gap: 16px; }
 .mast nav, .interior-page .mast nav { gap: 16px; }
 .nav-accounts { gap: 8px; }
 .mast .nav-login, .mast .nav-signup { padding: 8px 16px; }
}
@media (max-width: 520px) {
 .mast, .interior-page .mast { justify-content: center; }
 .mast nav, .interior-page .mast nav { justify-content: center; gap: 16px; }
}

/* Eligibility belongs beside signup, without a second registration action. */
.signup-eligibility { padding: 20px 24px; margin: 0 0 28px; background: var(--paper-alt); border-radius: 12px; }
.registration .signup-eligibility h2 { margin: 0; font-size: 1.125rem; letter-spacing: -.02em; line-height: 1.4; }
.registration .signup-eligibility p { margin: 8px 0 0; font-size: .875rem; line-height: 1.65; }

.mast .main-site-link { gap: 6px; }

/* Shared by both editions: one logo size per place and larger obvious.ai-style type. */
/* One logo size per place: the same on every page and at every window width. */
.brand, .mast .brand, footer .brand { gap: 8px; flex-shrink: 0; }
.mast .brand img, .interior-page .mast .brand img { width: 32px; height: 32px; }
.mast .brand span, .interior-page .mast .brand span { font-size: 1.5rem; font-weight: 600; letter-spacing: -.045em; }
footer .brand img { width: 28px; height: 28px; }
footer .brand span { font-size: 1.25rem; font-weight: 600; letter-spacing: -.045em; }

/* Larger, obvious.ai-style type: bold headlines, roomier body text, pill actions. */
body { font-size: 1.0625rem; color: var(--ink); }
.mast nav a { font-size: .9375rem; color: var(--ink); }
.mast nav a:hover { color: var(--muted); }
.mast .nav-login { background: transparent; border-radius: 999px; }
.mast .nav-login:hover { color: var(--ink); background: var(--selected); }
.mast .nav-signup { border-width: 1px; }
.mast .nav-signup:hover { color: var(--ink); border-color: var(--ink); background: var(--selected); }
.mast .nav-login, .mast .nav-signup { font-size: .9375rem; font-weight: 500; }
.hero h1 { font-size: clamp(2.75rem, 1.2rem + 4.6vw, 5.5rem); line-height: 1.06; letter-spacing: -.045em; }
.hero-line-emphasis { margin-top: 4px; }
.hero .lede { max-width: 44ch; font-size: clamp(1.125rem, 1rem + .45vw, 1.375rem); line-height: 1.45; font-weight: 500; }
.btn { border-radius: 999px; padding: .8rem 1.75rem; font-size: 1rem; }
.walk-title { font-size: clamp(2rem, 1rem + 2.6vw, 3.25rem); line-height: 1.1; letter-spacing: -.04em; }
.walk-toolbar button { padding: .7rem 1.15rem; font-size: .9375rem; }
.demo-description h3 { font-size: clamp(1.375rem, 1rem + .9vw, 1.75rem); font-weight: 600; letter-spacing: -.03em; }
.demo-description p { font-size: 1.125rem; line-height: 1.65; }
.research-community > p { font-size: .9375rem; }
.access:not(.enrollment) h2 { font-size: clamp(2rem, 1rem + 2.6vw, 3.25rem); letter-spacing: -.04em; }
.access p, .access > p { font-size: 1.125rem; }
.interior-page h1 { font-size: clamp(2.5rem, 1.4rem + 3.6vw, 4.25rem); line-height: 1.06; letter-spacing: -.045em; }
.film-heading > p:last-child { font-size: 1.125rem; }
.film-cover-title { font-weight: 600; }
.privacy-page p, .policy-copy ul { font-size: 1.0625rem; }
.privacy-page h2 { font-size: clamp(1.5rem, 1.1rem + 1vw, 1.875rem); font-weight: 600; letter-spacing: -.03em; }
.policy-copy h3 { font-size: 1.125rem; }
.policy-heading > p { font-size: 1.125rem; }
.policy-navigation a { font-size: .875rem; }
.enrollment > p { font-size: 1.1875rem; }
.enrollment article h2 { font-weight: 600; letter-spacing: -.035em; }
.enrollment article p { font-size: 1.0625rem; }
footer nav a { font-size: .875rem; }
@media (max-width: 680px) {
  .hero h1 { font-size: clamp(1.9rem, 8.2vw, 3rem); letter-spacing: -.045em; }
  .hero .lede { font-size: 1.0625rem; }
  .btn { padding: .75rem 1.25rem; font-size: .9375rem; }
  .walk-title { font-size: clamp(1.75rem, 7.4vw, 2.25rem); }
  .demo-description p { font-size: 1.0625rem; }
  .interior-page h1 { font-size: clamp(2.125rem, 9vw, 2.75rem); }
}

/* Stanford credit application on the Academia site. */
.apply-page h1 { font-size: clamp(2.25rem, 1.6rem + 2vw, 3rem); }
.registration-field textarea { width: 100%; min-width: 0; min-height: 132px; border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px; background: var(--paper); color: var(--ink); font: 400 1rem/1.55 var(--body); resize: vertical; transition: border-color 160ms ease; }
.registration-field textarea:hover { border-color: var(--muted); }
.registration-field textarea:focus { outline: 2px solid var(--cardinal); outline-offset: 2px; border-color: var(--cardinal); }
.apply-page .registration-form .btn { justify-content: center; border-radius: 999px; }
.apply-honeypot { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.apply-done { margin-top: 8px; padding: 24px; border: 1px solid var(--rule); border-radius: 16px; text-align: center; }
.apply-done p { font-size: 1.0625rem; }
.apply-page [hidden] { display: none; }

/* Academia and the Research page are subpages: one back link, no menu. */
.academia-mast, .subpage-mast { justify-content: flex-start; }
.academia-mast .brand-back, .subpage-mast .brand-back { flex: none; margin-right: 4px; color: var(--muted); transition: transform 160ms var(--ease-out), color 160ms ease; }
.academia-mast .brand:hover .brand-back, .subpage-mast .brand:hover .brand-back { color: var(--ink); transform: translateX(-3px); }
@media (max-width: 520px) { .academia-mast, .subpage-mast { justify-content: flex-start; } }

/* The Mac download is announced, not linked, until the release is public. */
.btn.btn-soon, .btn.btn-soon:hover, .btn.btn-soon:active { cursor: default; transform: none; background: var(--cardinal); border-color: var(--cardinal); color: var(--button-ink); }