/* burrow. design system. Surface yellow, soil strata, a headlamp in the dark.
   Pixelify Sans for the wordmark, Bricolage Grotesque for display, Instrument Sans for text,
   JetBrains Mono for data, Silkscreen for pixel labels. */
@import url('https://fonts.googleapis.com/css2?family=Pixelify+Sans:wght@500;700&family=Bricolage+Grotesque:opsz,wght@12..96,500;12..96,700;12..96,800&family=Instrument+Sans:wght@400;500;600&family=JetBrains+Mono:wght@400;500;700&family=Silkscreen&display=swap');

:root {
  --sun: #fdb301; --sun-2: #ffc83a; --sun-3: #ffdd7a; --cream: #fff3d1; --paper: #fbe9bd;
  --ink: #1c1008; --ink-2: #3b2414; --ink-3: #6b4a2e;
  --soil-1: #a26a33; --soil-2: #7c4c22; --soil-3: #5c3618; --soil-4: #3c2210; --soil-5: #241409; --bedrock: #120a05;
  --lamp: #ffe7a0; --lamp-hot: #fff6d8; --ok: #6be38a; --ok-ink: #0f6b33; --bad: #ff6b57; --warn: #ffb24a;
  --line: rgba(28, 16, 8, .16); --line-2: rgba(28, 16, 8, .28);
  --wordmark: "Pixelify Sans", ui-monospace, monospace;
  --display: "Bricolage Grotesque", system-ui, sans-serif;
  --body: "Instrument Sans", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, monospace;
  --pixel: "Silkscreen", ui-monospace, monospace;
  --px: 4px; /* one art pixel */
  --shadow: 6px 6px 0 var(--ink);
  --shadow-sm: 4px 4px 0 var(--ink);
  --wrap: 1240px;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; background: var(--sun); }
body { margin: 0; font-family: var(--body); font-size: 16.5px; line-height: 1.6; color: var(--ink); background: var(--sun); -webkit-font-smoothing: antialiased; overflow-x: clip; }
img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
::selection { background: var(--ink); color: var(--sun); }
.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }
.mono { font-family: var(--mono); font-size: .92em; }
.pixel { font-family: var(--pixel); letter-spacing: .02em; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
h1, h2, h3, h4 { margin: 0; font-family: var(--display); font-weight: 800; letter-spacing: -.025em; line-height: 1; text-wrap: balance; }
h2 { font-size: clamp(38px, 5vw, 72px); }
h3 { font-size: clamp(22px, 2vw, 28px); letter-spacing: -.015em; }
p { margin: 0 0 1em; }

/* ---------- wordmark: white pixel letters with a stepped brown shadow, like the banner */
.wordmark { font-family: var(--wordmark); font-weight: 700; color: #fff; letter-spacing: -.01em; line-height: .9; white-space: nowrap;
  text-shadow: .03em .03em 0 #5a3418, .06em .06em 0 #5a3418, .09em .09em 0 #3c2210; }
.wordmark .dot { color: #fff; }
.wordmark.ink { color: var(--ink); text-shadow: .04em .04em 0 rgba(28, 16, 8, .25); }

/* ---------- pixel corners: stepped clip for buttons, chips and cards */
.pc { clip-path: polygon(0 var(--c), var(--c) var(--c), var(--c) 0, calc(100% - var(--c)) 0, calc(100% - var(--c)) var(--c), 100% var(--c), 100% calc(100% - var(--c)), calc(100% - var(--c)) calc(100% - var(--c)), calc(100% - var(--c)) 100%, var(--c) 100%, var(--c) calc(100% - var(--c)), 0 calc(100% - var(--c))); --c: 4px; }

/* ---------- buttons: hard edges, hard shadows, they sink when pressed */
.btn { position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 52px; padding: 0 22px; border: 3px solid var(--ink); background: var(--cream); color: var(--ink);
  font-family: var(--pixel); font-size: 15px; letter-spacing: .03em; text-transform: uppercase; text-decoration: none; cursor: pointer; box-shadow: var(--shadow-sm); transition: transform .12s var(--ease), box-shadow .12s var(--ease), background .2s; white-space: nowrap; }
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--ink); }
.btn:active { transform: translate(4px, 4px); box-shadow: 0 0 0 var(--ink); }
.btn.dark { background: var(--ink); color: var(--sun); }
.btn.sun { background: var(--sun); }
.btn.sm { height: 40px; padding: 0 14px; font-size: 13px; border-width: 2px; box-shadow: 3px 3px 0 var(--ink); }
.btn.sm:hover { box-shadow: 5px 5px 0 var(--ink); }
.btn:disabled { opacity: .45; pointer-events: none; }
.btn .ico { width: 18px; height: 18px; image-rendering: pixelated; }
.on-dark .btn { border-color: var(--lamp); box-shadow: 4px 4px 0 var(--lamp); }
.on-dark .btn:hover { box-shadow: 6px 6px 0 var(--lamp); }
.on-dark .btn.dark { background: var(--lamp); color: var(--ink); }
.on-dark .btn:not(.dark) { background: transparent; color: var(--lamp); }

.chip { display: inline-flex; align-items: center; gap: 6px; height: 26px; padding: 0 10px; border: 2px solid currentColor; font-family: var(--pixel); font-size: 11px; letter-spacing: .04em; text-transform: uppercase; white-space: nowrap; }
.chip.fill { background: var(--ink); color: var(--sun); border-color: var(--ink); }
.chip.ok { color: var(--ok-ink); background: rgba(107, 227, 138, .25); }
.chip.bad { color: #a8261a; background: rgba(255, 107, 87, .2); }
.label { font-family: var(--pixel); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.depth-tag { display: inline-flex; align-items: center; gap: 10px; font-family: var(--pixel); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; }
.depth-tag i { display: inline-block; width: 22px; height: 3px; background: currentColor; }

/* ---------- top bar */
.top { position: sticky; top: 0; z-index: 60; }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 18px; height: 72px; }
.top .brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.top .brand img { width: 46px; height: auto; margin: -4px 0 -6px; filter: drop-shadow(2px 2px 0 rgba(28, 16, 8, .35)); }
.top .brand .wordmark { font-size: 30px; }
.top nav { display: flex; align-items: center; gap: 4px; }
.top nav a { position: relative; padding: 8px 12px; font-family: var(--pixel); font-size: 13px; letter-spacing: .05em; text-transform: uppercase; text-decoration: none; color: var(--ink); }
.top nav a:hover, .top nav a.on { background: var(--ink); color: var(--sun); }
.top .side { display: flex; align-items: center; gap: 10px; }
.top .ext { display: grid; place-items: center; width: 40px; height: 40px; border: 2px solid var(--ink); background: var(--cream); box-shadow: 3px 3px 0 var(--ink); }
.top .ext svg { width: 18px; height: 18px; }
.top .burger { display: none; }
.top.stuck .bar { background: rgba(253, 179, 1, .92); backdrop-filter: blur(8px); border-bottom: 3px solid var(--ink); }
.top .bar { transition: background .2s; border-bottom: 3px solid transparent; }
.dark-page .top .bar { background: rgba(18, 10, 5, .9); border-bottom-color: var(--soil-3); backdrop-filter: blur(8px); }
.dark-page .top nav a { color: var(--lamp); }
.dark-page .top nav a:hover, .dark-page .top nav a.on { background: var(--lamp); color: var(--ink); }
.dark-page .top .ext { background: transparent; border-color: var(--lamp); color: var(--lamp); box-shadow: 3px 3px 0 var(--lamp); }
.mnav { display: none; }

/* ---------- live chain ticker (real data, re-hashed in the page) */
.ticker { display: inline-flex; align-items: center; gap: 14px; padding: 10px 16px; border: 3px solid var(--ink); background: var(--cream); box-shadow: var(--shadow-sm); font-family: var(--mono); font-size: 13px; }
.ticker .pulse { width: 10px; height: 10px; background: var(--ok); box-shadow: 0 0 0 3px var(--ink); animation: blink 1.4s steps(2) infinite; }
.ticker b { font-weight: 700; }
@keyframes blink { 50% { opacity: .25; } }

/* ---------- strata: soil layers with generated pixel textures (site.js paints --tex) */
.stratum { position: relative; isolation: isolate; color: var(--cream); background-color: var(--soil-2); }
.stratum::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: var(--tex); background-size: 128px 128px; image-rendering: pixelated; opacity: .9; }
.stratum .wrap { position: relative; }
.stratum.s1 { background-color: var(--soil-1); color: var(--ink); }
.stratum.s2 { background-color: var(--soil-2); }
.stratum.s3 { background-color: var(--soil-3); }
.stratum.s4 { background-color: var(--soil-4); }
.stratum.s5 { background-color: var(--soil-5); }
.stratum.s6 { background-color: var(--bedrock); }
.edge { position: absolute; left: 0; right: 0; height: 24px; z-index: 2; background-repeat: repeat-x; background-size: auto 100%; image-rendering: pixelated; pointer-events: none; }
.edge.up { top: -23px; }

/* ---------- headlamp: dark sections where a warm light follows the pointer */
.lamp-zone { position: relative; }
.lamp-zone .lamp-dark { position: absolute; inset: 0; z-index: 3; pointer-events: none; background: radial-gradient(circle var(--r, 260px) at var(--lx, 50%) var(--ly, 40%), rgba(18, 10, 5, 0) 0%, rgba(18, 10, 5, .25) 45%, rgba(18, 10, 5, .9) 100%); transition: background .05s; }
.lamp-zone .lamp-glow { position: absolute; inset: 0; z-index: 2; pointer-events: none; mix-blend-mode: soft-light; background: radial-gradient(circle calc(var(--r, 260px) * .8) at var(--lx, 50%) var(--ly, 40%), rgba(255, 231, 160, .55), transparent 70%); }
.fossil { position: relative; z-index: 1; font-family: var(--mono); font-size: 11.5px; line-height: 1.5; color: var(--lamp); opacity: .85; transform: rotate(var(--rot, -3deg)); pointer-events: none; }
.fossil b { display: block; font-family: var(--pixel); font-size: 11px; letter-spacing: .1em; color: var(--sun); margin-bottom: 2px; }
.fossil svg { width: 54px; height: auto; margin-bottom: 6px; opacity: .8; }

/* ---------- depth meter on the home page */
.meter { position: fixed; left: 18px; top: 50%; z-index: 40; transform: translateY(-50%); display: flex; align-items: stretch; gap: 10px; pointer-events: none; opacity: 0; transition: opacity .4s; }
.meter.on { opacity: 1; }
.meter .rail { position: relative; width: 6px; height: 46vh; background: rgba(28, 16, 8, .35); border: 2px solid var(--ink); }
.meter .fill { position: absolute; left: 0; right: 0; top: 0; height: var(--d, 0%); background: var(--sun); }
.meter .mole { position: absolute; left: 50%; top: var(--d, 0%); width: 30px; height: 30px; margin: -15px 0 0 -15px; background: var(--sun); border: 2px solid var(--ink); display: grid; place-items: center; }
.meter .mole img { width: 24px; transform: rotate(60deg); }
.meter .read { align-self: center; padding: 6px 8px; background: var(--ink); color: var(--sun); font-family: var(--pixel); font-size: 12px; line-height: 1.3; }
.meter .read small { display: block; color: var(--lamp); opacity: .7; font-size: 10px; }

/* ---------- panels */
.panel { position: relative; border: 3px solid var(--ink); background: var(--cream); color: var(--ink); box-shadow: var(--shadow); }
.panel-h { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 16px; border-bottom: 3px solid var(--ink); background: var(--sun); font-family: var(--pixel); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; }
.panel-h .dots { display: flex; gap: 6px; } .panel-h .dots i { width: 10px; height: 10px; background: var(--ink); }
.panel-b { padding: 18px; }
.panel.dark { background: #1a0f08; color: var(--cream); border-color: var(--lamp); box-shadow: 6px 6px 0 rgba(255, 231, 160, .35); }
.panel.dark .panel-h { background: var(--soil-4); color: var(--lamp); border-bottom-color: var(--lamp); }
.panel.dark .panel-h .dots i { background: var(--lamp); }

.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; font-family: var(--mono); font-size: 13px; }
.kv dt { color: var(--ink-3); }
.kv dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.panel.dark .kv dt { color: rgba(255, 231, 160, .6); }

/* ---------- forms */
.field { display: grid; gap: 6px; margin-bottom: 14px; }
.field > span { font-family: var(--pixel); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; }
.field input, .field textarea, .field select { width: 100%; height: 50px; padding: 0 14px; border: 3px solid var(--ink); background: #fffaf0; font-family: var(--mono); font-size: 14px; outline: 0; box-shadow: inset 3px 3px 0 rgba(28, 16, 8, .08); }
.field textarea { height: auto; min-height: 140px; padding: 12px 14px; resize: vertical; line-height: 1.5; }
.field input:focus, .field textarea:focus { background: #fff; box-shadow: inset 3px 3px 0 rgba(28, 16, 8, .08), 0 0 0 3px var(--sun); }
.field small { font-size: 13px; color: var(--ink-3); }
.on-dark .field input, .on-dark .field textarea { background: #0d0703; color: var(--lamp-hot); border-color: var(--soil-2); box-shadow: none; }
.on-dark .field input:focus, .on-dark .field textarea:focus { border-color: var(--lamp); box-shadow: 0 0 0 3px rgba(255, 231, 160, .25); }
.on-dark .field small { color: rgba(255, 231, 160, .55); }

/* ---------- the tunnel: a proof drawn as a shaft of chambers */
.tunnel { position: relative; display: grid; gap: 0; padding-left: 34px; }
.tunnel::before { content: ""; position: absolute; left: 13px; top: 8px; bottom: 8px; width: 8px; background: repeating-linear-gradient(180deg, var(--soil-2) 0 8px, var(--soil-3) 8px 16px); border: 2px solid var(--ink); }
.chamber { position: relative; margin: 0 0 14px; padding: 12px 14px; border: 3px solid var(--ink); background: #2b190d; color: var(--cream); box-shadow: 4px 4px 0 var(--ink); opacity: 0; transform: translateY(-10px); transition: opacity .35s var(--ease), transform .35s var(--ease); }
.chamber.in { opacity: 1; transform: none; }
.chamber::before { content: ""; position: absolute; left: -31px; top: 16px; width: 18px; height: 18px; background: var(--sun); border: 3px solid var(--ink); }
.chamber .t { display: flex; align-items: center; justify-content: space-between; gap: 10px; font-family: var(--pixel); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--lamp); }
.chamber .h { margin-top: 6px; font-family: var(--mono); font-size: 12px; color: rgba(255, 243, 209, .75); overflow-wrap: anywhere; }
.chamber .nibs { display: flex; flex-wrap: wrap; gap: 3px; margin-top: 8px; }
.chamber .nibs i { display: grid; place-items: center; width: 20px; height: 20px; font-style: normal; font-family: var(--mono); font-size: 11px; background: rgba(255, 231, 160, .08); color: rgba(255, 231, 160, .45); }
.chamber .nibs i.on { background: var(--sun); color: var(--ink); font-weight: 700; }
.chamber .nibs i.used { background: rgba(255, 231, 160, .22); color: var(--lamp); }
.chamber.root { background: var(--sun); color: var(--ink); }
.chamber.root .t, .chamber.root .h { color: var(--ink); }
.chamber.value { background: var(--ok); color: var(--ink); }
.chamber.value .t, .chamber.value .h { color: var(--ink); }
.chamber.value::before { background: var(--ok); }
.chamber.absent { background: #3a1410; }

/* ---------- stamp */
.stamp { display: inline-grid; place-items: center; padding: 10px 18px; border: 5px solid currentColor; color: var(--ok-ink); font-family: var(--pixel); font-size: 28px; letter-spacing: .06em; transform: rotate(-6deg); text-transform: uppercase; background: rgba(107, 227, 138, .18); }
.stamp.bad { color: #a8261a; background: rgba(255, 107, 87, .15); }
.stamp.warn { color: #9a5a00; background: rgba(255, 178, 74, .2); }
.stamp small { font-size: 11px; letter-spacing: .12em; }
.stamp.pop { animation: stamp .45s cubic-bezier(.2, 1.6, .4, 1) both; }
@keyframes stamp { from { transform: rotate(-6deg) scale(2.2); opacity: 0; } }

/* ---------- checks list */
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-family: var(--mono); font-size: 13px; }
.checks li { display: grid; grid-template-columns: 22px 1fr; gap: 8px; align-items: start; opacity: 0; transform: translateX(-6px); transition: opacity .25s, transform .25s; }
.checks li.in { opacity: 1; transform: none; }
.checks li i { display: grid; place-items: center; width: 18px; height: 18px; margin-top: 1px; font-style: normal; font-size: 12px; font-weight: 700; background: var(--ok); color: var(--ink); }
.checks li.no i { background: var(--bad); }
.checks li small { display: block; color: var(--ink-3); font-size: 12px; }
.on-dark .checks li small { color: rgba(255, 231, 160, .55); }

/* ---------- tables */
.tbl { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 13px; }
.tbl th { text-align: left; padding: 10px 12px; font-family: var(--pixel); font-size: 11px; font-weight: 400; letter-spacing: .08em; text-transform: uppercase; background: var(--ink); color: var(--sun); position: sticky; top: 0; }
.tbl td { padding: 9px 12px; border-bottom: 2px dashed var(--line); vertical-align: top; }
.tbl td.r, .tbl th.r { text-align: right; }
.tbl tr:hover td { background: rgba(253, 179, 1, .18); }
.on-dark .tbl td { border-bottom-color: rgba(255, 231, 160, .12); }
.on-dark .tbl tr:hover td { background: rgba(255, 231, 160, .06); }
.scroll-x { overflow-x: auto; }

/* ---------- code */
pre.code { margin: 0; padding: 16px 18px; overflow-x: auto; background: #140b05; color: #ffe7a0; border: 3px solid var(--ink); font-family: var(--mono); font-size: 13px; line-height: 1.65; box-shadow: var(--shadow-sm); }
pre.code .c { color: #a98a66; } pre.code .k { color: #ffb24a; } pre.code .s { color: #9be8a8; } pre.code .p { color: #fdb301; }
code { font-family: var(--mono); font-size: .9em; padding: 1px 6px; background: rgba(28, 16, 8, .08); }

/* ---------- footer: bedrock */
.foot { position: relative; color: var(--lamp); background: var(--bedrock); isolation: isolate; overflow: hidden; }
.foot::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: var(--tex); background-size: 128px; image-rendering: pixelated; opacity: .8; }
.foot .glow { position: absolute; left: 50%; bottom: -260px; width: 900px; height: 420px; margin-left: -450px; z-index: -1; background: radial-gradient(closest-side, rgba(255, 120, 30, .35), transparent); filter: blur(10px); animation: magma 6s ease-in-out infinite alternate; }
@keyframes magma { to { opacity: .55; transform: scale(1.1); } }
.foot-in { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); gap: 32px; padding: 90px 0 40px; }
.foot h4 { font-family: var(--pixel); font-weight: 400; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--sun); margin-bottom: 14px; }
.foot a { display: block; padding: 3px 0; text-decoration: none; color: var(--cream); font-size: 15px; }
.foot a:hover { color: var(--sun); }
.foot .fine { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding: 22px 0 34px; border-top: 2px dashed rgba(255, 231, 160, .2); font-family: var(--mono); font-size: 12px; color: rgba(255, 231, 160, .55); }
.foot .big { font-size: clamp(90px, 17vw, 260px); line-height: .8; margin: 10px 0 -16px; opacity: .95; }

/* ---------- reveal */
.rv { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .8s var(--ease); }
.rv.in { opacity: 1; transform: none; }

/* ---------- responsive base */
@media (max-width: 980px) {
  .top nav { display: none; }
  .top .burger { display: inline-flex; }
  .mnav.open { display: grid; position: fixed; top: 76px; left: 12px; right: 12px; z-index: 70; padding: 10px; gap: 4px; background: var(--cream); border: 3px solid var(--ink); box-shadow: var(--shadow); }
  .mnav a { padding: 12px; font-family: var(--pixel); font-size: 14px; text-transform: uppercase; text-decoration: none; color: var(--ink); }
  .mnav a:hover { background: var(--sun); }
  .meter { display: none; }
  .foot-in { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .wrap { padding: 0 16px; }
  .top .ext { display: none; }
  .top .brand .wordmark { font-size: 26px; }
  .foot-in { grid-template-columns: 1fr; }
  .btn { height: 48px; padding: 0 16px; font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) { .rv { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }
@media (max-width: 640px) { .top .side .btn.dark { display: none; } .top .brand img { width: 38px; } }

/* the depth meter needs a free margin on the left: only on wide screens */
@media (max-width: 1499px) { .meter { display: none; } }