/* Tessera website. The palette comes from the logo: five faceted tiles (lapis, teal, amber, sky, violet),
   the teal and amber of the wordmark, and the deep navy of the tile shadows. */

:root {
  --paper: #fbf8f1;
  --paper-2: #f2ede1;
  --card: #ffffff;
  --ink: #06192c;
  --muted: #4d5c70;
  --line: #e2dccd;
  --brand: #087f8c;          /* wordmark teal */
  --brand-ink: #ffffff;
  --link: #1745b8;
  --gold: #d99a45;           /* wordmark amber */
  --lapis-a: #4c7dff; --lapis-b: #1745b8;
  --teal-a: #50e5d0;  --teal-b: #008c91;
  --amber-a: #ffe39a; --amber-b: #d98b32;
  --sky-a: #71c9ff;   --sky-b: #3263d9;
  --violet-a: #8a75ff; --violet-b: #197d9a;
  --panel: #06192c;
  --panel-ink: #eaf2ff;
  --code-bg: #08182b;
  --code-ink: #dbe7ff;
  --glass: rgba(251, 248, 241, .82);
  --shadow: 0 1px 0 rgba(6, 25, 44, .04), 0 12px 30px -12px rgba(6, 25, 44, .25);
  --cut: 22px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme=light]) {
    --paper: #07121f; --paper-2: #0b1a2c; --card: #0e2036; --ink: #eaf2ff; --muted: #95a7c0; --line: #1b3250;
    --brand: #50e5d0; --brand-ink: #06192c; --link: #8fb0ff; --gold: #ffd37a;
    --panel: #0e2036; --code-bg: #050e1a; --glass: rgba(7, 18, 31, .82);
    --shadow: 0 1px 0 rgba(255, 255, 255, .04), 0 12px 30px -12px rgba(0, 0, 0, .7);
    color-scheme: dark;
  }
}
:root[data-theme=dark] {
  --paper: #07121f; --paper-2: #0b1a2c; --card: #0e2036; --ink: #eaf2ff; --muted: #95a7c0; --line: #1b3250;
  --brand: #50e5d0; --brand-ink: #06192c; --link: #8fb0ff; --gold: #ffd37a;
  --panel: #0e2036; --code-bg: #050e1a; --glass: rgba(7, 18, 31, .82);
  --shadow: 0 1px 0 rgba(255, 255, 255, .04), 0 12px 30px -12px rgba(0, 0, 0, .7);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 17px/1.7 "Avenir Next", Montserrat, "Segoe UI Variable", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-underline-offset: 3px; }
img, svg { max-width: 100%; }
a:focus-visible, button:focus-visible, .btn:focus-visible { outline: 3px solid var(--lapis-a); outline-offset: 3px; border-radius: 6px; }
::selection { background: var(--teal-a); color: #06192c; }

.wrap { width: min(1160px, 100% - 40px); margin-inline: auto; }
.narrow { width: min(780px, 100% - 40px); }

/* ---- the facet: what makes a tile look like the logo's tiles ---- */
.t1 { --a: var(--lapis-a); --b: var(--lapis-b); }
.t2 { --a: var(--teal-a); --b: var(--teal-b); }
.t3 { --a: var(--amber-a); --b: var(--amber-b); }
.t4 { --a: var(--sky-a); --b: var(--sky-b); }
.t5 { --a: var(--violet-a); --b: var(--violet-b); }
.facet {
  position: relative; isolation: isolate;
  background: linear-gradient(135deg, var(--a), var(--b));
  clip-path: polygon(14% 0, 86% 0, 100% 14%, 100% 86%, 86% 100%, 14% 100%, 0 86%, 0 14%);
}
.facet::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(to left, rgba(6, 25, 44, .17) 0 24%, transparent 24%),
    linear-gradient(to right, rgba(6, 25, 44, .12) 0 18%, transparent 18%),
    linear-gradient(168deg, rgba(255, 255, 255, .34) 0 34%, transparent 34%);
}

/* ---- header ---- */
.skip { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 14px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 8px; }
header.site {
  position: sticky; top: 0; z-index: 40;
  background: var(--glass); -webkit-backdrop-filter: saturate(1.4) blur(14px); backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
header.site::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 3px;
  background: linear-gradient(90deg, var(--lapis-a), var(--teal-a), var(--amber-a), var(--sky-a), var(--violet-a));
}
.bar { display: flex; align-items: center; justify-content: space-between; gap: 10px 24px; padding: 10px 0; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; font-size: 1.05rem; }
.brand img { width: 38px; height: 38px; transition: transform .4s cubic-bezier(.2, .9, .3, 1.4); }
.brand:hover img { transform: rotate(-8deg) scale(1.08); }
.brand span { color: var(--brand); }
nav.main { display: flex; flex-wrap: wrap; align-items: center; gap: 2px 4px; }
nav.main a { color: var(--muted); text-decoration: none; padding: 7px 14px; border-radius: 999px; font-size: .94rem; font-weight: 600; transition: color .2s, background .2s; }
nav.main a:hover { color: var(--ink); background: var(--paper-2); }
nav.main a[aria-current=page] { color: var(--brand-ink); background: var(--brand); }
nav.main a.gh { border: 1.5px solid var(--line); margin-left: 6px; }
nav.main a.gh:hover { border-color: var(--brand); }
.icon-btn {
  display: inline-grid; place-items: center; width: 38px; height: 38px; margin-left: 6px; cursor: pointer;
  border: 1.5px solid var(--line); border-radius: 50%; background: transparent; color: var(--ink); font-size: 1.05rem; line-height: 1;
}
.icon-btn:hover { border-color: var(--brand); }
.menu-btn { display: none; }

/* ---- headings and text ---- */
h1, h2, h3 { line-height: 1.15; margin: 0 0 .55em; letter-spacing: -.015em; }
h1 { font-size: clamp(2.3rem, 5.6vw, 4.2rem); font-weight: 800; letter-spacing: -.03em; }
h2 { font-size: clamp(1.55rem, 3.2vw, 2.15rem); font-weight: 750; display: flex; align-items: center; gap: .55em; }
h2::before { content: ""; flex: none; width: .5em; height: .5em; border-radius: 22%; background: var(--teal-a); box-shadow: .7em 0 var(--amber-a), 1.4em 0 var(--lapis-a); margin-right: 1.4em; }
h3 { font-size: 1.15rem; font-weight: 700; }
p { margin: 0 0 1.05em; }
code { font: .9em ui-monospace, "Cascadia Code", SFMono-Regular, Menlo, Consolas, monospace; background: var(--paper-2); border: 1px solid var(--line); padding: .08em .38em; border-radius: 6px; }
.lead { font-size: clamp(1.1rem, 1.6vw, 1.32rem); color: var(--muted); max-width: 42em; }
.intro { color: var(--muted); max-width: 46em; }
.muted { color: var(--muted); }

/* ---- buttons ---- */
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 0; }
.btn {
  display: inline-flex; align-items: center; gap: .5em; padding: 12px 24px; font-weight: 700; text-decoration: none; color: var(--ink);
  background: var(--card); border: 1.5px solid var(--line); border-radius: 999px;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.btn:hover { transform: translateY(-2px); border-color: var(--brand); box-shadow: var(--shadow); }
.btn.primary { background: linear-gradient(135deg, var(--lapis-a), var(--lapis-b)); border-color: transparent; color: #fff; }
.btn.primary:hover { box-shadow: 0 14px 28px -10px rgba(23, 69, 184, .7); }

/* ---- hero ---- */
.hero { position: relative; overflow: hidden; padding: clamp(48px, 8vw, 110px) 0 clamp(56px, 8vw, 100px); }
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0; opacity: .9;
  background: url("/assets/img/mosaic.svg") 0 0 / 240px 240px;
  -webkit-mask-image: radial-gradient(ellipse at 78% 40%, #000, transparent 70%); mask-image: radial-gradient(ellipse at 78% 40%, #000, transparent 70%);
}
.hero::after {
  content: ""; position: absolute; z-index: 0; width: 60vw; height: 60vw; right: -20vw; top: -25vw; border-radius: 50%;
  background: radial-gradient(circle, rgba(80, 229, 208, .28), transparent 62%);
}
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.25fr .75fr; gap: 48px; align-items: center; }
.hero h1 { background: linear-gradient(100deg, var(--ink) 0 55%, var(--lapis-b) 78%, var(--brand) 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
:root[data-theme=dark] .hero h1 { background-image: linear-gradient(100deg, #fff 0 50%, var(--sky-a) 80%, var(--teal-a)); }
@media (prefers-color-scheme: dark) { :root:not([data-theme=light]) .hero h1 { background-image: linear-gradient(100deg, #fff 0 50%, var(--sky-a) 80%, var(--teal-a)); } }

.tiles {
  --rx: 0deg; --ry: 0deg;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 5%; width: min(380px, 78vw); justify-self: center; aspect-ratio: 1;
  transform: perspective(900px) rotateX(var(--rx)) rotateY(var(--ry)); transform-style: preserve-3d; transition: transform .18s ease-out;
  filter: drop-shadow(0 22px 24px rgba(6, 25, 44, .28));
}
.tiles i { display: block; aspect-ratio: 1; animation: drop .9s cubic-bezier(.2, .9, .3, 1.2) both, bob 6s ease-in-out infinite; }
.tiles i:nth-child(1) { animation-delay: .05s, 1s; transform: translateZ(10px); }
.tiles i:nth-child(2) { animation-delay: .15s, 1.4s; transform: translateZ(28px); }
.tiles i:nth-child(3) { animation-delay: .25s, 1.8s; transform: translateZ(10px); }
.tiles i:nth-child(4) { grid-column: 2; animation-delay: .35s, 2.2s; transform: translateZ(46px); }
.tiles i:nth-child(5) { grid-column: 2; animation-delay: .45s, 2.6s; transform: translateZ(20px); }
@keyframes drop { from { opacity: 0; translate: 0 -60px; rotate: -8deg; scale: .85; } to { opacity: 1; translate: 0 0; rotate: 0deg; scale: 1; } }
@keyframes bob { 0%, 100% { translate: 0 0; } 50% { translate: 0 -7px; } }

/* ---- inner page banner ---- */
.banner { position: relative; overflow: hidden; padding: clamp(40px, 6vw, 80px) 0 clamp(28px, 4vw, 48px); border-bottom: 1px solid var(--line); background: linear-gradient(180deg, var(--paper-2), var(--paper)); }
.banner::before { content: ""; position: absolute; inset: 0; background: url("/assets/img/mosaic.svg") 100% 0 / 240px 240px; -webkit-mask-image: linear-gradient(90deg, transparent 35%, #000); mask-image: linear-gradient(90deg, transparent 35%, #000); }
.banner .wrap { position: relative; }
.banner h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); }
.banner .lead { margin: 0; }

/* ---- blocks ---- */
.block { padding: clamp(26px, 4vw, 44px) 0; }
.block p:last-child { margin-bottom: 0; }
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s cubic-bezier(.2, .8, .2, 1); }
.js .reveal.in { opacity: 1; transform: none; }

/* cards: chamfered like the tiles, with a faceted number */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 22px; margin-top: 28px; counter-reset: card; }
.card {
  --c: var(--a, var(--lapis-a));
  position: relative; padding: 26px 26px 22px; counter-increment: card; isolation: isolate;
  background: linear-gradient(135deg, var(--a), transparent 62%);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  transition: transform .25s;
}
.card::before {
  content: ""; position: absolute; inset: 1.5px; z-index: -1; background: var(--card);
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
}
.card:hover { transform: translateY(-5px); }
.card h3::before {
  content: counter(card, decimal-leading-zero); display: grid; place-items: center; width: 46px; height: 46px; margin-bottom: 16px;
  font: 800 .95rem/1 ui-monospace, Menlo, Consolas, monospace; color: #06192c; position: relative; isolation: isolate;
  background: linear-gradient(135deg, var(--a), var(--b));
  clip-path: polygon(14% 0, 86% 0, 100% 14%, 100% 86%, 86% 100%, 14% 100%, 0 86%, 0 14%);
  text-shadow: 0 1px 0 rgba(255, 255, 255, .35);
}
.card p { color: var(--muted); margin-bottom: .7em; }
.card .more { margin: 0; font-weight: 700; }
.card .more a::after { content: " \2192"; }

/* steps: a timeline */
.steps { list-style: none; counter-reset: step; padding: 0; margin: 30px 0 0; position: relative; display: grid; gap: 26px; }
.steps::before { content: ""; position: absolute; left: 25px; top: 20px; bottom: 20px; width: 3px; background: linear-gradient(var(--lapis-a), var(--teal-a), var(--amber-a), var(--sky-a), var(--violet-a)); border-radius: 3px; opacity: .55; }
.steps li { counter-increment: step; position: relative; display: grid; grid-template-columns: 52px 1fr; gap: 2px 22px; align-items: start; }
.steps li::before {
  content: counter(step); grid-row: span 2; display: grid; place-items: center; width: 52px; height: 52px; font-weight: 800; font-size: 1.15rem; color: #06192c;
  background: linear-gradient(135deg, var(--a), var(--b)); clip-path: polygon(14% 0, 86% 0, 100% 14%, 100% 86%, 86% 100%, 14% 100%, 0 86%, 0 14%);
}
.steps li:nth-child(5n+1) { --a: var(--lapis-a); --b: var(--lapis-b); }
.steps li:nth-child(5n+2) { --a: var(--teal-a); --b: var(--teal-b); }
.steps li:nth-child(5n+3) { --a: var(--amber-a); --b: var(--amber-b); }
.steps li:nth-child(5n+4) { --a: var(--sky-a); --b: var(--sky-b); }
.steps li:nth-child(5n+5) { --a: var(--violet-a); --b: var(--violet-b); }
.steps h3 { margin: 4px 0 0; }
.steps p { margin: 0; color: var(--muted); }

.ticks { list-style: none; padding: 0; margin: 0 0 1em; }
.ticks li { position: relative; padding: 4px 0 4px 34px; }
.ticks li::before { content: ""; position: absolute; left: 4px; top: .72em; width: 14px; height: 14px; background: linear-gradient(135deg, var(--teal-a), var(--teal-b)); clip-path: polygon(14% 0, 86% 0, 100% 14%, 100% 86%, 86% 100%, 14% 100%, 0 86%, 0 14%); }
.ticks li:nth-child(even)::before { background: linear-gradient(135deg, var(--amber-a), var(--amber-b)); }

/* code: a window with the three tile colours */
figure.code { margin: 26px 0; border-radius: 16px; overflow: hidden; background: var(--code-bg); box-shadow: var(--shadow); border: 1px solid rgba(143, 176, 255, .18); position: relative; }
figure.code figcaption { display: flex; align-items: center; gap: 12px; padding: 10px 16px 10px 20px; font: 600 .8rem ui-monospace, Menlo, Consolas, monospace; color: #93a8c8; border-bottom: 1px solid rgba(143, 176, 255, .14); }
figure.code figcaption::before { content: ""; width: 11px; height: 11px; border-radius: 50%; background: var(--lapis-a); box-shadow: 18px 0 var(--amber-a), 36px 0 var(--teal-a); margin-right: 40px; }
pre { margin: 0; padding: 18px 22px 22px; overflow: auto; color: var(--code-ink); font: 14.5px/1.7 ui-monospace, "Cascadia Code", SFMono-Regular, Menlo, Consolas, monospace; tab-size: 4; }
pre code { background: none; border: 0; padding: 0; font: inherit; color: inherit; }
.copy { position: absolute; right: 12px; top: 7px; border: 1px solid rgba(143, 176, 255, .25); background: transparent; color: #93a8c8; border-radius: 8px; padding: 3px 10px; font: 600 .75rem system-ui, sans-serif; cursor: pointer; }
.copy:hover { color: #fff; border-color: var(--teal-a); }
.tok-k { color: #8fb0ff; font-weight: 600; }
.tok-t { color: #50e5d0; }
.tok-s { color: #ffe39a; }
.tok-n { color: #ffb86b; }
.tok-c { color: #6f86a8; font-style: italic; }
.tok-e { color: #c9a7ff; }
.tok-v { color: #71c9ff; }

/* callout */
.callout {
  position: relative; padding: 20px 26px 20px 30px; background: var(--card); isolation: isolate;
  clip-path: polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));
  box-shadow: inset 6px 0 0 var(--gold);
  border: 1px solid var(--line);
}
.callout strong { display: block; margin-bottom: 4px; color: var(--gold); letter-spacing: .08em; text-transform: uppercase; font-size: .8rem; }
.callout p { color: var(--muted); }

/* call to action */
.cta { position: relative; overflow: hidden; margin: clamp(30px, 5vw, 60px) 0 0; padding: clamp(46px, 7vw, 84px) 0; background: var(--panel); color: var(--panel-ink); text-align: center; }
.cta::before { content: ""; position: absolute; inset: 0; background: url("/assets/img/mosaic.svg") 50% 0 / 240px 240px; opacity: .9; -webkit-mask-image: radial-gradient(ellipse at center, #000, transparent 75%); mask-image: radial-gradient(ellipse at center, #000, transparent 75%); }
.cta .wrap { position: relative; }
.cta h2 { justify-content: center; color: #fff; }
.cta p { color: #b9c9e3; }
.cta .actions { justify-content: center; }
.cta .btn { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .3); }
.cta .btn.primary { background: linear-gradient(135deg, var(--teal-a), var(--teal-b)); color: #06192c; border-color: transparent; }

/* footer */
.strip { display: grid; grid-template-columns: repeat(10, 1fr); height: 8px; margin-top: clamp(36px, 6vw, 70px); }
.strip i:nth-child(5n+1) { background: var(--lapis-a); } .strip i:nth-child(5n+2) { background: var(--teal-a); }
.strip i:nth-child(5n+3) { background: var(--amber-a); } .strip i:nth-child(5n+4) { background: var(--sky-a); }
.strip i:nth-child(5n+5) { background: var(--violet-a); }
footer.site { padding: 34px 0 48px; color: var(--muted); font-size: .93rem; background: var(--paper-2); }
footer.site .wrap { display: grid; grid-template-columns: auto 1fr; gap: 14px 36px; align-items: start; }
footer.site img { width: 54px; height: 54px; }
footer.site p { margin: 0 0 .55em; }
footer.site .links a { margin-right: 18px; font-weight: 600; white-space: nowrap; }

/* admin */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; margin: 24px 0 34px; }
.stat { position: relative; padding: 18px 22px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; }
.stat::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: linear-gradient(var(--a, var(--lapis-a)), var(--b, var(--lapis-b))); }
.stat b { display: block; font-size: 2.2rem; line-height: 1.15; letter-spacing: -.02em; }
.stat span { color: var(--muted); font-size: .9rem; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 26px; }
table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; font-size: .95rem; box-shadow: var(--shadow); }
th, td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--line); }
th { font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); background: var(--paper-2); }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: 0; }
.chart { width: 100%; height: auto; background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
.chart .bar-rect { fill: var(--lapis-a); }
.chart .bar-rect:hover { fill: var(--teal-b); }
.chart .axis { stroke: var(--line); }
.chart text { fill: var(--muted); font-size: 11px; text-anchor: middle; }

/* small screens */
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .tiles { width: 190px; justify-self: start; }
  .js .menu-btn { display: inline-grid; }
  .js nav.main { display: none; width: 100%; flex-direction: column; align-items: stretch; padding: 6px 0 12px; }
  .js nav.main.open { display: flex; }
  .bar { flex-wrap: wrap; }
  nav.main a.gh { margin: 4px 0 0; text-align: center; }
  footer.site .wrap { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .js .reveal { opacity: 1; transform: none; }
}
@media print { header.site, .cta, .strip, .copy { display: none; } }