/* The ensō site: the product's own design template (ui/DESIGN.md) carried to a page that
   advertises it. Warm paper, ink in four steps, square corners, colour only where it
   carries meaning (the one blue is for what can be pressed), Source Serif 4 for words
   that headline, IBM Plex Sans for the rest, IBM Plex Mono for labels and never for a
   figure. Nothing is fetched from anywhere else: the faces are in fonts/. */
@font-face { font-family: 'Source Serif 4'; font-weight: 200 900; font-display: swap; src: url('fonts/SourceSerif4-latin-var.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Sans'; font-weight: 100 700; font-stretch: 100%; font-display: swap; src: url('fonts/IBMPlexSans-latin-var.woff2') format('woff2'); }
@font-face { font-family: 'IBM Plex Mono'; font-weight: 400; font-display: swap; src: url('fonts/IBMPlexMono-400-latin.woff2') format('woff2'); }

:root {
  color-scheme: light dark;
  --paper: #FAFAF8; --sunken: #F1EDE5; --raised: #FDFCF9;
  --ink: #1A1816; --ink-2: #494540; --ink-3: #655F58;
  --rule: #DED7CB; --rule-strong: #B0A899;
  --mark: #2C4C8F; --on-mark: #FFFFFF;
  --display: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --ui: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --gutter: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17161B; --sunken: #201E25; --raised: #1C1B21;
    --ink: #ECE8E1; --ink-2: #C3BDB4; --ink-3: #97928A;
    --rule: #2D2B33; --rule-strong: #4C4954;
    --mark: #6FA0EE; --on-mark: #0E1218;
  }
}
@media (min-width: 720px) { :root { --gutter: 24px; } }
@media (min-width: 1100px) { :root { --gutter: 32px; } }

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.6 var(--ui); }
img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--mark); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--mark); outline-offset: 3px; }
.skip { position: absolute; left: -9999px; top: 0; padding: 10px 14px; background: var(--ink); color: var(--paper); z-index: 10; }
.skip:focus { left: 0; }
.wrap { max-width: 72rem; margin: 0 auto; padding: 0 var(--gutter); }

/* header */
.top { border-bottom: 1px solid var(--rule); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 68px; flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink-2); text-decoration: none; }
.brand img { width: 40px; height: 40px; }
.brand span { font: 400 30px/1 var(--display); letter-spacing: 0.04em; }
.nav { display: flex; gap: 22px; }
.nav a { color: var(--ink-2); text-decoration: none; padding: 8px 0; font-size: 15px; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--ink); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--mark); }

/* type */
.eyebrow { margin: 0 0 14px; font: 400 12.5px/1.3 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); }
h1, h2, h3 { font-family: var(--display); font-weight: 500; color: var(--ink); margin: 0; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); line-height: 1.08; letter-spacing: -0.012em; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); line-height: 1.18; letter-spacing: -0.006em; }
h3 { font-size: 1.28rem; line-height: 1.25; }
.lede { margin: 22px 0 0; max-width: 40em; font-size: clamp(1.08rem, 1.6vw, 1.26rem); line-height: 1.55; color: var(--ink-2); }
.prose p { margin: 0 0 1em; max-width: 40em; color: var(--ink-2); }
.small { font-size: 14.5px; color: var(--ink-3); }

section.wrap { padding-top: 80px; }
.sec-head { max-width: 40em; margin-bottom: 28px; }
.sec-head p { margin: 14px 0 0; color: var(--ink-2); }

/* buttons */
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.btn { display: inline-block; padding: 12px 20px; border: 1px solid var(--mark); color: var(--mark); text-decoration: none; font-weight: 500; font-size: 16px; line-height: 1.2; background: transparent; }
.btn:hover { background: var(--sunken); }
.btn.primary { background: var(--mark); color: var(--on-mark); }
.btn.primary:hover { filter: brightness(1.08); }

/* hero */
.hero { padding-top: 56px; }
.hero .grid { display: grid; gap: 40px; align-items: center; }
@media (min-width: 960px) { .hero .grid { grid-template-columns: 0.9fr 1.1fr; } }
.frame { border: 1px solid var(--rule-strong); background: var(--raised); }
.frame img { width: 100%; }

/* hairline grids */
.cards { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
@media (min-width: 640px) { .cards.two { grid-template-columns: 1fr 1fr; } }
@media (min-width: 900px) { .cards.four { grid-template-columns: repeat(2, 1fr); } }
.card { background: var(--paper); padding: 24px 22px 26px; }
.card h3 { margin-bottom: 10px; }
.card p { margin: 0 0 .8em; color: var(--ink-2); font-size: 16px; }
.card p:last-child { margin-bottom: 0; }
.card .eyebrow { margin-bottom: 10px; }

/* video cards and players */
.vcard { display: block; background: var(--paper); color: inherit; text-decoration: none; }
.vcard:hover h3 { color: var(--mark); }
.thumb { position: relative; border-bottom: 1px solid var(--rule); }
.thumb img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.thumb .len { position: absolute; right: 10px; bottom: 10px; padding: 3px 8px; background: var(--ink); color: var(--paper); font: 400 13px/1.3 var(--mono); }
.thumb .play { position: absolute; left: 50%; top: 50%; width: 64px; height: 64px; transform: translate(-50%, -50%); background: var(--paper); border: 1px solid var(--ink); display: grid; place-items: center; }
.thumb .play::after { content: ''; border-left: 18px solid var(--ink); border-top: 11px solid transparent; border-bottom: 11px solid transparent; margin-left: 5px; }
.vcard .body { padding: 20px 22px 24px; }
.vcard h3 { margin-bottom: 8px; }
.vcard p { margin: 0; color: var(--ink-2); font-size: 16px; }

.player { border: 1px solid var(--rule-strong); background: #000; }
.player video { width: 100%; aspect-ratio: 16/9; background: #000; }
.vmeta { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 14px 0 0; padding: 0; list-style: none; font-size: 14.5px; color: var(--ink-3); }
.vmeta a { color: var(--mark); }
.video { padding-top: 56px; scroll-margin-top: 12px; }
.video + .video { margin-top: 56px; border-top: 1px solid var(--rule); }
.video .cols { display: grid; gap: 28px; margin-top: 22px; }
@media (min-width: 960px) { .video .cols { grid-template-columns: 1.6fr 1fr; align-items: start; } }
details.tx { border: 1px solid var(--rule); background: var(--raised); }
details.tx summary { cursor: pointer; padding: 14px 18px; font-weight: 500; color: var(--ink); }
.tx ol { list-style: none; margin: 0; padding: 0 0 6px; max-height: 26rem; overflow: auto; border-top: 1px solid var(--rule); }
.tx li { margin: 0; }
.tx button { display: grid; grid-template-columns: 3.4em 1fr; gap: 10px; width: 100%; text-align: left; padding: 9px 18px; border: 0; background: transparent; color: var(--ink-2); font: 400 15px/1.5 var(--ui); cursor: pointer; }
.tx button:hover { background: var(--sunken); color: var(--ink); }
.tx button[aria-current="true"] { background: var(--sunken); color: var(--ink); box-shadow: inset 3px 0 0 var(--mark); }
.tx .t { font: 400 13px/1.9 var(--mono); color: var(--ink-3); }
.tx p.plain { margin: 0; padding: 9px 18px; color: var(--ink-2); font-size: 15px; }

/* documents */
.shelf { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--rule); }
.shelf li { display: grid; gap: 4px 24px; padding: 20px 0; border-bottom: 1px solid var(--rule); }
@media (min-width: 760px) { .shelf li { grid-template-columns: 1fr auto; align-items: center; } }
.shelf .name { font: 500 1.3rem/1.3 var(--display); color: var(--ink); text-decoration: none; }
.shelf .name:hover { color: var(--mark); }
.shelf .said { margin: 4px 0 0; max-width: 42em; color: var(--ink-2); font-size: 16px; }
.shelf .get { display: flex; gap: 18px; font-size: 15px; white-space: nowrap; }

.note { margin-top: 28px; padding: 16px 20px; border-left: 3px solid var(--rule-strong); background: var(--sunken); color: var(--ink-2); font-size: 15.5px; max-width: 46em; }

footer { margin-top: 88px; padding: 28px 0 56px; border-top: 1px solid var(--rule); color: var(--ink-3); font-size: 14.5px; }
footer .wrap { display: grid; gap: 10px; }
footer p { margin: 0; max-width: 52em; }
footer .mark { font: 400 22px/1 var(--display); letter-spacing: 0.04em; color: var(--ink-2); }

/* the sign-in */
[hidden] { display: none !important; }
.narrow { max-width: 56rem; }
.two { display: grid; gap: 40px; margin-top: 36px; }
@media (min-width: 760px) { .two { grid-template-columns: 1fr 1fr; } }
.two h2 { font-size: 1.4rem; margin-bottom: 16px; }
label { display: block; margin: 0 0 6px; font-weight: 500; color: var(--ink); }
input[type=email], input[inputmode=numeric] { display: block; width: 100%; max-width: 24rem; margin: 0 0 16px; padding: 12px 14px; border: 1px solid var(--rule-strong); border-radius: 0; background: var(--raised); color: var(--ink); font: 400 17px/1.3 var(--ui); }
textarea { display: block; width: 100%; max-width: 40rem; margin: 0 0 16px; padding: 12px 14px; border: 1px solid var(--rule-strong); background: var(--raised); color: var(--ink); font: inherit; line-height: 1.5; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
input[inputmode=numeric] { font: 400 22px/1.3 var(--mono); letter-spacing: 0.12em; max-width: 14rem; }
.status { min-height: 1.6em; margin: 28px 0 0; padding: 0; color: var(--ink-2); max-width: 40em; }
.status.bad { color: var(--ink); border-left: 3px solid var(--ink); padding-left: 12px; }
button.btn { cursor: pointer; font-family: var(--ui); }
button.btn:disabled { opacity: .55; cursor: default; }
.prose h2 { margin: 36px 0 12px; font-size: 1.5rem; }
.prose ul { max-width: 40em; color: var(--ink-2); padding-left: 1.2em; }
.prose li { margin-bottom: .6em; }