/* LBrain.ai v2 (prism 2026-10-22). Light: near-white field, deep ink, one teal accent (#00C2B8; darkened to #00736D for
   small text, 5.6:1 on white). Self-hosted IBM Plex Sans; system monospace. No external requests. */
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 300 700; font-display: swap; src: url(fonts/ibm-plex-sans-latin.woff2) format("woff2"); }
:root { --bg: #fbfcfc; --ink: #0d1b24; --muted: #4f5f69; --line: #dbe4e6; --teal: #00c2b8; --teal-text: #00736d; --soft: #f1f6f6;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; } @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 17px/1.6 "IBM Plex Sans", system-ui, sans-serif; }
a { color: var(--teal-text); } a:focus-visible, button:focus-visible { outline: 2px solid var(--teal-text); outline-offset: 3px; }
.skip { position: absolute; left: -999px; top: 8px; background: #fff; padding: 8px 12px; z-index: 99; } .skip:focus { left: 12px; }
.mv-hoh.bar { --mv-hoh-ink: var(--ink); --mv-hoh-ink-on-hero: var(--ink); --mv-hoh-bar: rgba(251,252,252,.88); --mv-hoh-line: var(--line);
  display: flex; align-items: center; justify-content: space-between; height: 68px; padding: 0 clamp(20px, 4vw, 48px); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: inherit; text-decoration: none; font-weight: 600; font-size: 20px; letter-spacing: -.01em; }
.brand .dot { width: 12px; height: 12px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 0 4px rgba(0,194,184,.18); }
.bar nav { display: flex; align-items: center; gap: 26px; font-size: 15px; } .bar nav a { color: inherit; text-decoration: none; } .bar nav a:hover { color: var(--teal-text); }
@media (max-width: 760px) { .bar nav a:not(.btn) { display: none; } }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px; border-radius: 999px; background: var(--ink); color: #fff !important; font-weight: 600; text-decoration: none; font-size: 15px; border: 1.5px solid var(--ink); }
.btn:hover { background: var(--teal-text); border-color: var(--teal-text); }
.btn.line { background: transparent; color: var(--ink) !important; } .btn.line:hover { color: #fff !important; }
.btn.big { min-height: 54px; padding: 0 28px; font-size: 16px; }

.hero { position: relative; min-height: min(100svh, 980px); display: grid; align-items: end; overflow: hidden; background: #eef2f3; }
.film { position: absolute; inset: 0; }
.film video { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero::after { content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(90deg, rgba(251,252,252,.94) 0%, rgba(251,252,252,.72) 32%, rgba(251,252,252,0) 60%), linear-gradient(0deg, rgba(251,252,252,.9) 0%, rgba(251,252,252,0) 30%); }
.hero-copy { position: relative; z-index: 2; max-width: 620px; padding: 0 clamp(20px, 5vw, 72px) clamp(56px, 11vh, 120px); }
.kicker { margin: 0 0 16px; font-size: 13px; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--teal-text); }
h1 { margin: 0; font-size: clamp(2.8rem, 6.4vw, 5.6rem); line-height: .98; letter-spacing: -.035em; font-weight: 600; }
.lede { margin: 22px 0 0; font-size: clamp(18px, 1.6vw, 21px); color: var(--muted); max-width: 46ch; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.replay { position: absolute; right: clamp(16px, 3vw, 40px); bottom: 20px; z-index: 3; background: none; border: 0; padding: 12px 6px; min-height: 44px; cursor: pointer;
  font: 600 12.5px/1 "IBM Plex Sans", system-ui, sans-serif; letter-spacing: .18em; text-transform: uppercase; color: var(--teal-text); }
.replay:hover { text-decoration: underline; text-underline-offset: 5px; }
@media (max-width: 760px) {
  .hero { min-height: auto; display: block; }
  .film { position: relative; aspect-ratio: 16 / 9; }
  .hero::after { display: none; }
  .hero-copy { padding: 28px 20px 48px; }
}

main > section:not(.hero) { max-width: 1240px; margin: 0 auto; padding: clamp(64px, 10vw, 128px) clamp(20px, 4vw, 48px); }
.word { display: grid; gap: clamp(28px, 5vw, 72px); align-items: center; }
@media (min-width: 900px) { .word { grid-template-columns: 1.15fr .85fr; } .word.flip .art { order: 2; } }
.art img { display: block; width: 100%; height: auto; border-radius: 18px; box-shadow: 0 30px 60px -40px rgba(13,27,36,.45); }
.num { margin: 0; font: 500 13px var(--mono); color: var(--teal-text); }
h2 { margin: 8px 0 14px; font-size: clamp(2rem, 3.6vw, 3rem); letter-spacing: -.025em; line-height: 1.05; font-weight: 600; }
.copy p { margin: 0 0 12px; color: var(--ink); } .small { font-size: 15px; color: var(--muted) !important; }

.demo { margin-top: 22px; border: 1.5px solid var(--line); border-radius: 16px; padding: 16px 18px; background: #fff; }
.tag { margin: 0 0 10px; font: 600 11px/1 "IBM Plex Sans", sans-serif; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.tabs button { font: inherit; font-size: 14px; padding: 8px 14px; min-height: 40px; border-radius: 999px; border: 1.5px solid var(--line); background: #fff; color: var(--ink); cursor: pointer; }
.tabs button[aria-selected="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.q { margin: 0 0 6px !important; font-size: 15px; color: var(--muted) !important; }
.a { margin: 0 0 8px !important; font-size: 19px; font-weight: 500; }
.a.no { color: var(--ink); }
.src { margin: 0 !important; font: 13px/1.5 var(--mono); color: var(--muted) !important; }
.src span { color: var(--teal-text); margin-right: 6px; }
.panel .a, .panel .src { transform: translateY(6px); transition: transform .5s; }
.panel.on .a, .panel.on .src { transform: none; } .panel.on .src { transition-delay: .35s; }

.start { text-align: left; }
.cmds { list-style: none; margin: 22px 0 16px; padding: 0; display: grid; gap: 10px; counter-reset: c; max-width: 820px; }
.cmds li { min-width: 0; display: flex; align-items: center; justify-content: space-between; gap: 12px; background: var(--ink); color: #fff; border-radius: 14px; padding: 12px 12px 12px 18px; }
.cmds code { font: 500 15px/1.4 var(--mono); overflow-x: auto; white-space: pre; min-width: 0; flex: 1; }
.copy-btn { flex: none; font: 600 12px/1 "IBM Plex Sans", sans-serif; letter-spacing: .08em; text-transform: uppercase; color: #bff3ef; background: transparent; border: 1px solid rgba(255,255,255,.3); border-radius: 999px; padding: 0 12px; min-height: 36px; cursor: pointer; }
.inline { font: 14px var(--mono); background: var(--soft); padding: 2px 6px; border-radius: 6px; }

.papers { list-style: none; margin: 22px 0 0; padding: 0; display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); }
.papers a { display: block; padding: 18px 20px; border: 1.5px solid var(--line); border-radius: 14px; color: var(--ink); text-decoration: none; font-weight: 500; background: #fff; }
.papers a:hover { border-color: var(--teal-text); }
.papers span { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; color: var(--teal-text); }

.foot { max-width: 1240px; margin: 0 auto; padding: 32px clamp(20px, 4vw, 48px) 56px; border-top: 1px solid var(--line); color: var(--muted); font-size: 15px; }
.foot p { margin: 6px 0; }

/* only pictures fade in; text never sits at low opacity (contrast stays measurable) */
.reveal { transform: translateY(18px); transition: transform .8s ease; } .art.reveal { opacity: 0; transition: opacity .8s ease, transform .8s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } .panel .a, .panel .src { opacity: 1; transform: none; transition: none; } }