:root {
  --bg: #f6f5f1; --paper: #ffffff; --ink: #17181c; --muted: #5f6470; --line: #e4e2dc; --chip: #efede7;
  --accent: #d1492e; --accent-2: #2f6fd8; --shadow: 0 1px 2px rgba(20, 20, 30, .05), 0 10px 30px rgba(20, 20, 30, .07);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1013; --paper: #17181d; --ink: #ecebe6; --muted: #9a9ea8; --line: #2a2c33; --chip: #22242a;
    --accent: #f06a4b; --accent-2: #6b9cf0; --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 10px 30px rgba(0, 0, 0, .35);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { max-width: 100%; display: block; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* top bar */
.nav { position: sticky; top: 0; z-index: 10; backdrop-filter: saturate(1.4) blur(10px); background: color-mix(in srgb, var(--bg) 82%, transparent); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: -.01em; text-decoration: none; white-space: nowrap; flex: none; }
.brand svg { width: 26px; height: 26px; }
.nav ul { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; font-size: 14px; }
.nav ul a { text-decoration: none; color: var(--muted); }
.nav ul a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav ul { gap: 14px; font-size: 13px; overflow-x: auto; } .nav ul li.opt { display: none; } }
@media (max-width: 380px) { .nav ul li.opt-xs { display: none; } }
@media (max-width: 420px) { .nav ul { gap: 11px; font-size: 12.5px; } .brand { gap: 8px; font-size: 15px; } .brand svg { width: 22px; height: 22px; } }

/* hero */
.hero { padding-top: 88px; padding-bottom: 56px; }
.eyebrow { font: 600 12px/1 var(--sans); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.hero h1 { font: 700 clamp(40px, 7vw, 76px)/1.02 var(--serif); letter-spacing: -.02em; margin: 14px 0 22px; text-wrap: balance; }
.hero p.lede { font-size: clamp(18px, 2.2vw, 22px); line-height: 1.5; max-width: 760px; color: var(--muted); margin: 0; }
.hero p.lede strong { color: var(--ink); font-weight: 600; }
.areas { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 44px; }
.area { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 20px 20px 18px; box-shadow: var(--shadow); }
.area b { display: block; font-size: 15px; margin-bottom: 6px; }
.area span { color: var(--muted); font-size: 14.5px; }
@media (max-width: 860px) { .areas { grid-template-columns: minmax(0, 1fr); } }

/* sections */
section.block { padding: 64px 0 24px; scroll-margin-top: 56px; }
section.block > .wrap > header { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 26px; border-bottom: 1px solid var(--line); padding-bottom: 12px; }
section.block h2 { font: 700 32px/1.1 var(--serif); letter-spacing: -.01em; margin: 0; }
section.block header p { margin: 0; color: var(--muted); font-size: 14.5px; }

/* app cards */
.apps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.app { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.app .shot { display: block; background: #101115; border-bottom: 1px solid var(--line); aspect-ratio: 16 / 10; overflow: hidden; }
.app .shot img { width: 100%; height: 100%; object-fit: cover; object-position: top left; transition: transform .4s ease; }
.app .shot:hover img { transform: scale(1.015); }
/* window captures with their own transparent shadow: show whole, centred, uncropped */
.app .shot.window { background: radial-gradient(120% 90% at 50% 0%, #3a3f4b, #1b1d23); display: grid; place-items: center; padding: 10px 14px 4px; }
.app .shot.window img { width: 100%; height: 100%; object-fit: contain; object-position: center; }
.app .shot.soon { display: grid; place-items: center; background: repeating-linear-gradient(-45deg, var(--chip) 0 14px, transparent 14px 28px); }
.app .shot.soon img { width: 96px; height: 96px; object-fit: contain; filter: drop-shadow(0 6px 18px rgba(0,0,0,.25)); }
.app .body { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.app h3 { margin: 0; font-size: 20px; letter-spacing: -.01em; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tag { font: 600 11px/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; padding: 4px 8px; border-radius: 999px; background: var(--chip); color: var(--muted); }
.tag.oss { color: #2c8a4b; background: color-mix(in srgb, #2c8a4b 13%, transparent); }
.tag.soon { color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.tag.live { color: var(--accent-2); background: color-mix(in srgb, var(--accent-2) 12%, transparent); }
.app p { margin: 0; color: var(--muted); font-size: 15px; }
.links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; padding-top: 6px; }
.btn { display: inline-flex; align-items: center; gap: 7px; padding: 8px 13px; border-radius: 10px; border: 1px solid var(--line); background: var(--chip); text-decoration: none; font-size: 14px; font-weight: 600; }
.btn:hover { border-color: color-mix(in srgb, var(--ink) 30%, var(--line)); }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn svg { width: 16px; height: 16px; flex: none; }
.fine { font-size: 12.5px; color: var(--muted); }
@media (max-width: 860px) { .apps { grid-template-columns: minmax(0, 1fr); } }

/* research */
.papers { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.paper { display: grid; grid-template-columns: 112px minmax(0, 1fr); gap: 18px; background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 16px; box-shadow: var(--shadow); }
.paper .thumb { display: block; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; background: #fff; align-self: start; }
.paper h3 { margin: 0 0 4px; font: 600 17px/1.3 var(--serif); }
.paper h3 a { text-decoration: none; }
.paper h3 a:hover { text-decoration: underline; }
.paper .meta { font-size: 12.5px; color: var(--muted); margin-bottom: 6px; }
.paper p { margin: 0 0 10px; font-size: 14.5px; color: var(--muted); }
.paper .links .btn { padding: 5px 10px; font-size: 13px; }
.feature { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 26px; align-items: center; margin-top: 26px; background: var(--paper); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); }
.feature .shot img { width: 100%; }
.feature .body { padding: 22px 26px 22px 0; }
.feature h3 { margin: 6px 0 8px; font: 700 24px/1.2 var(--serif); }
.feature p { color: var(--muted); margin: 0 0 14px; }
@media (max-width: 860px) { .papers, .feature { grid-template-columns: minmax(0, 1fr); } .feature .body { padding: 0 20px 20px; } .paper { grid-template-columns: 88px minmax(0, 1fr); } }

/* books */
.books { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.book { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 18px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 12px; }
.book .pages { display: grid; grid-template-columns: 1.15fr 1fr; gap: 10px; align-items: start; }
.book .pages a { display: block; border: 1px solid var(--line); border-radius: 4px; overflow: hidden; background: #fff; box-shadow: 0 4px 14px rgba(0,0,0,.08); }
.book .pages .tocs { display: grid; gap: 10px; }
.book h3 { margin: 4px 0 0; font: 700 19px/1.25 var(--serif); }
.book p { margin: 0; color: var(--muted); font-size: 14.5px; }
@media (max-width: 960px) { .books { grid-template-columns: minmax(0, 1fr); } .book .pages { max-width: 520px; } }

/* writing + scalien */
.two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 20px 22px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 6px; font: 700 20px/1.25 var(--serif); }
.card p { margin: 0 0 12px; color: var(--muted); font-size: 15px; }
.intro { color: var(--muted); max-width: 820px; margin: 0 0 20px; }
@media (max-width: 860px) { .two { grid-template-columns: minmax(0, 1fr); } }

/* letter */
.letter { max-width: 760px; margin: 0 auto; background: #fffdf7; color: #1f1d18; border: 1px solid #e8e1cf; border-radius: 6px;
  box-shadow: 0 30px 60px -30px rgba(60, 40, 10, .35), 0 2px 6px rgba(0,0,0,.06); padding: 54px 60px 50px; font: 17px/1.65 var(--serif); position: relative; }
.letter::before { content: ""; position: absolute; inset: 14px; border: 1px solid #efe8d6; border-radius: 3px; pointer-events: none; }
.letter .head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; margin-bottom: 30px; font-family: var(--sans); }
.letter .head .co { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .02em; }
.letter .head .co svg { width: 30px; height: 30px; }
.letter .head .where { font-size: 12.5px; color: #7b7465; text-align: right; line-height: 1.5; }
.letter p { margin: 0 0 16px; }
.letter ul, .letter ol { margin: 0 0 16px; padding-left: 22px; }
.letter li { margin-bottom: 8px; }
.letter .sig { margin-top: 26px; }
.letter .sig .name { font: italic 28px/1 var(--serif); margin: 10px 0 2px; }
@media (max-width: 640px) { .letter { padding: 34px 26px; font-size: 16px; } .letter::before { inset: 8px; } }

footer { border-top: 1px solid var(--line); margin-top: 70px; padding: 26px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
footer a { color: var(--muted); }