/* Birchpad landing. Colours come from the app icon: birch bark, its dark marks, and the green tile. */

@font-face {
  font-family: "Literata";
  src: url("fonts/literata-cyrillic.woff2") format("woff2");
  font-weight: 200 900;
  font-display: swap;
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: "Literata";
  src: url("fonts/literata-latin.woff2") format("woff2");
  font-weight: 200 900;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/jbmono-cyrillic.woff2") format("woff2");
  font-weight: 100 800;
  font-display: swap;
  unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("fonts/jbmono-latin.woff2") format("woff2");
  font-weight: 100 800;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --paper: #f8f4ea;
  --paper-2: #f0e9d8;
  --card: #fffdf7;
  --ink: #2b2620;
  --ink-2: #5b5246;
  --ink-3: #8a7f6f;
  --line: #e3d9c4;
  --green: #2c7149;
  --green-2: #4fa26f;
  --green-ink: #fff;
  --green-soft: #e1eedf;
  --orange: #e0892b;
  --mark: #2f2a25;

  /* The editor mock keeps its own palette in both themes. */
  --ed-bg: #fffdf8;
  --ed-chrome: #efe8d6;
  --ed-gutter: #f6f1e4;
  --ed-ln: #b0a48d;
  --ed-text: #2b2620;
  --ed-kw: #a2378a;
  --ed-fn: #2361a8;
  --ed-str: #2c7149;
  --ed-com: #9a8e78;
  --ed-num: #b5541c;
  --ed-ty: #8a5a00;
  --ed-sel: #d9ead8;
  --ed-caret: #2c7149;

  --serif: "Literata", "Georgia", "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;

  --radius: 14px;
  --shadow: 0 1px 2px rgb(43 38 32 / .06), 0 12px 40px -12px rgb(43 38 32 / .22);
  --wrap: 1120px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121814;
    --paper-2: #18201b;
    --card: #1c2520;
    --ink: #ece6d6;
    --ink-2: #bdb4a3;
    --ink-3: #8c8576;
    --line: #2b3630;
    --green: #6cc08b;
    --green-2: #4fa26f;
    --green-ink: #0d1a12;
    --green-soft: #1f3327;
    --mark: #ece6d6;

    --ed-bg: #171d19;
    --ed-chrome: #1f2722;
    --ed-gutter: #1a211c;
    --ed-ln: #5c665e;
    --ed-text: #e6e0cf;
    --ed-kw: #e08ad0;
    --ed-fn: #82b6f2;
    --ed-str: #8fd3a5;
    --ed-com: #7d8579;
    --ed-num: #f0a46e;
    --ed-ty: #e7c46d;
    --ed-sel: #24402f;
    --ed-caret: #8fd3a5;

    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 16px 48px -16px rgb(0 0 0 / .6);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--green); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
code, kbd { font-family: var(--mono); font-size: .88em; }
:not(pre) > code {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: .08em .38em;
}
kbd {
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: .05em .4em;
  background: var(--card);
}
:focus-visible { outline: 3px solid var(--green-2); outline-offset: 3px; border-radius: 6px; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .wrap { padding: 0 16px; } }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; z-index: 100; background: var(--card); padding: 8px 12px; }

/* Header */
.top {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s;
}
.top.scrolled { border-bottom-color: var(--line); }
.top .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 600 20px/1 var(--serif); }
.brand img { width: 32px; height: 32px; }
.nav { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav a { color: var(--ink-2); text-decoration: none; font-size: 15px; }
.nav a:hover { color: var(--ink); }
.nav .lang { border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; font: 500 13px var(--mono); }
.nav .gh { display: inline-flex; align-items: center; gap: 6px; }
.nav .gh svg { width: 18px; height: 18px; }
@media (max-width: 760px) {
  .nav .opt { display: none; }
  .nav { gap: 14px; }
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 22px; border-radius: 12px;
  font: 600 16px/1.2 var(--sans); text-decoration: none;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s, background .15s, box-shadow .15s;
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-primary { background: var(--green); color: var(--green-ink); box-shadow: 0 6px 20px -8px var(--green); }
.btn-primary:hover { background: color-mix(in srgb, var(--green) 88%, var(--ink)); }
.btn-ghost { color: var(--ink); border-color: var(--line); background: var(--card); }
.btn-ghost:hover { border-color: var(--ink-3); }
.btn small { display: block; font-weight: 400; font-size: 12.5px; opacity: .85; margin-top: 3px; }

/* Hero */
.hero { padding: 64px 0 40px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 56px; align-items: center; }
@media (max-width: 960px) {
  .hero { padding-top: 36px; }
  .hero .wrap { grid-template-columns: minmax(0, 1fr); gap: 40px; }
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 13px/1 var(--mono); color: var(--ink-2);
  border: 1px solid var(--line); background: var(--card);
  padding: 7px 12px; border-radius: 999px; text-decoration: none;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); }
.eyebrow:hover { color: var(--ink); }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -.01em; line-height: 1.15; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(36px, 5.4vw, 58px); margin: 22px 0 18px; }
h1 em { font-style: italic; color: var(--green); font-weight: 500; }
.lead { font-size: clamp(17px, 1.6vw, 19.5px); color: var(--ink-2); margin: 0 0 30px; max-width: 34em; text-wrap: pretty; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.cta-note { margin: 16px 0 0; font-size: 14px; color: var(--ink-3); }
.cta-note a { color: inherit; }

/* Editor mock */
.editor {
  background: var(--ed-bg); color: var(--ed-text);
  border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin: 0;
  font: 13.5px/1.75 var(--mono);
  transform: rotate(.6deg);
}
@media (max-width: 960px) { .editor { transform: none; } }
.ed-menu { display: flex; gap: 14px; padding: 7px 14px; background: var(--ed-chrome); font: 12.5px var(--sans); color: var(--ink-2); align-items: center; }
.ed-menu .lights { display: flex; gap: 6px; margin-right: 6px; }
.ed-menu .lights i { width: 10px; height: 10px; border-radius: 50%; background: var(--line); display: block; }
.ed-tabs { display: flex; background: var(--ed-chrome); padding: 0 8px; gap: 2px; border-bottom: 1px solid var(--line); overflow: hidden; }
.ed-tab { padding: 6px 14px 7px; font: 12.5px var(--sans); color: var(--ink-3); border-radius: 8px 8px 0 0; white-space: nowrap; display: flex; align-items: center; gap: 6px; }
.ed-tab.on { background: var(--ed-bg); color: var(--ed-text); box-shadow: inset 0 2px 0 var(--green-2); }
.ed-tab .mod { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); }
.ed-body { display: grid; grid-template-columns: auto auto 1fr; padding: 10px 0; overflow: hidden; }
.ed-ln { text-align: right; color: var(--ed-ln); padding: 0 10px 0 14px; user-select: none; background: var(--ed-gutter); }
.ed-ch { width: 4px; background: var(--ed-gutter); margin-right: 14px; }
.ed-ch span { display: block; height: 1.75em; }
.ed-ch .s { background: #6ab47f; }
.ed-ch .u { background: var(--orange); }
.ed-code { white-space: pre; overflow: hidden; padding-right: 14px; }
.ed-code > div { min-height: 1.75em; }
.ed-code .sel { background: var(--ed-sel); border-radius: 3px; }
.k { color: var(--ed-kw); } .f { color: var(--ed-fn); } .s { color: var(--ed-str); }
.c { color: var(--ed-com); font-style: italic; } .n { color: var(--ed-num); } .t { color: var(--ed-ty); }
.caret { display: inline-block; width: 2px; height: 1.25em; vertical-align: -.22em; margin-right: -2px; background: var(--ed-caret); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .caret { animation: none; } }
.ed-status { display: flex; gap: 18px; justify-content: flex-end; padding: 5px 14px; background: var(--ed-chrome); font: 11.5px var(--sans); color: var(--ink-2); border-top: 1px solid var(--line); white-space: nowrap; overflow: hidden; }
.ed-status span:first-child { margin-right: auto; }
@media (max-width: 600px) {
  .editor { font-size: 11.5px; }
  .ed-status .opt, .ed-menu .opt { display: none; }
}

/* Facts strip */
.facts { padding: 28px 0 8px; }
.facts ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.facts li { background: var(--card); padding: 18px 20px; }
.facts b { display: block; font: 600 26px/1.2 var(--serif); }
.facts span { color: var(--ink-2); font-size: 14.5px; }
@media (max-width: 760px) { .facts ul { grid-template-columns: repeat(2, 1fr); } }

/* Sections */
section { padding: 88px 0 0; }
@media (max-width: 600px) { section { padding-top: 64px; } }
.kicker { font: 500 13px/1 var(--mono); color: var(--green); text-transform: uppercase; letter-spacing: .08em; margin: 0 0 14px; }
h2 { font-size: clamp(28px, 3.6vw, 40px); margin-bottom: 14px; }
.sub { color: var(--ink-2); max-width: 40em; margin: 0 0 40px; font-size: 18px; text-wrap: pretty; }

/* Features */
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
@media (max-width: 960px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .grid { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card h3 { font-size: 20px; margin: 14px 0 8px; }
.card p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.card .ic { width: 40px; height: 40px; border-radius: 10px; background: var(--green-soft); color: var(--green); display: grid; place-items: center; }
.card .ic svg { width: 22px; height: 22px; }
.card.wide { grid-column: span 2; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: center; }
@media (max-width: 600px) { .card.wide { grid-column: auto; grid-template-columns: minmax(0, 1fr); } }
.snippet { background: var(--ed-bg); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; font: 13px/1.7 var(--mono); color: var(--ed-text); overflow-x: auto; margin: 0; }
.snippet .p { color: var(--ink-3); user-select: none; }

/* Migration */
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
@media (max-width: 860px) { .split { grid-template-columns: minmax(0, 1fr); } }
.checks { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 12px; }
.checks li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; color: var(--ink-2); font-size: 15.5px; }
.checks li::before { content: ""; width: 18px; height: 18px; margin-top: 4px; border-radius: 50%; background: var(--green-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3 3 7-7' fill='none' stroke='%234fa26f' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat; }
.checks b { color: var(--ink); font-weight: 600; }

/* Trust */
.trust { background: var(--paper-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 72px 0; margin-top: 88px; }
.trust h3 { font-size: 24px; margin-bottom: 8px; }
.trust .card { padding: 28px; }
.big-zero { font: 600 64px/1 var(--serif); color: var(--green); margin-bottom: 8px; }

/* Download */
.dl-box { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 36px; box-shadow: var(--shadow); }
@media (max-width: 600px) { .dl-box { padding: 22px 18px; } }
.dl-head { display: flex; flex-wrap: wrap; gap: 20px 32px; align-items: center; justify-content: space-between; margin-bottom: 28px; }
.dl-head p { margin: 0; color: var(--ink-2); }
.dl-ver { font: 500 14px var(--mono); color: var(--ink-3); }
.dl-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 860px) { .dl-list { grid-template-columns: minmax(0, 1fr); } }
.os { border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.os.me { border-color: var(--green-2); box-shadow: 0 0 0 1px var(--green-2) inset; }
.os h3 { font-size: 18px; display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.os h3 svg { width: 22px; height: 22px; color: var(--ink-2); }
.os ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.os li a { display: flex; justify-content: space-between; gap: 10px; padding: 7px 10px; margin: 0 -10px; border-radius: 8px; text-decoration: none; color: var(--ink); font-size: 15px; }
.os li a:hover { background: var(--paper-2); }
.os li a span:last-child { color: var(--ink-3); font: 12.5px var(--mono); white-space: nowrap; padding-top: 2px; }
.os .note { font-size: 13.5px; color: var(--ink-3); margin: 10px 0 0; }
.dl-foot { margin: 24px 0 0; font-size: 14.5px; color: var(--ink-2); display: grid; gap: 6px; }

/* Roadmap */
.road { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; position: relative; }
.road li { display: grid; grid-template-columns: 34px 1fr; gap: 16px; padding-bottom: 26px; position: relative; }
.road li::after { content: ""; position: absolute; left: 16px; top: 30px; bottom: 0; width: 2px; background: var(--line); }
.road li:last-child::after { display: none; }
.road .pin { width: 34px; height: 34px; border-radius: 50%; border: 2px solid var(--line); background: var(--card); display: grid; place-items: center; font: 600 13px var(--mono); color: var(--ink-3); z-index: 1; }
.road .done .pin { background: var(--green-2); border-color: var(--green-2); color: #fff; }
.road .now .pin { border-color: var(--orange); color: var(--orange); }
.road h3 { font-size: 19px; margin: 4px 0 4px; }
.road p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.tag { font: 500 11.5px/1 var(--mono); padding: 4px 7px; border-radius: 6px; vertical-align: 3px; margin-left: 8px; background: var(--green-soft); color: var(--green); white-space: nowrap; }
.tag.next { background: color-mix(in srgb, var(--orange) 16%, transparent); color: var(--orange); }

/* Story: a strip of birch bark */
.bark {
  position: relative; border-radius: 20px; padding: 48px 48px 44px; overflow: hidden;
  background: linear-gradient(90deg, #e9e1cd, #fcfaf3 18%, #f7f2e5 80%, #ddd3ba);
  color: #2b2620;
  box-shadow: var(--shadow);
}
@media (max-width: 600px) { .bark { padding: 30px 22px; } }
.bark .marks { position: absolute; inset: 0; pointer-events: none; opacity: .9; }
.bark .in { position: relative; max-width: 40em; }
.bark h2 { color: #2b2620; }
.bark p { color: #4a4238; margin: 0 0 14px; font-family: var(--serif); font-size: 18.5px; line-height: 1.65; }
.bark .kicker { color: #25633e; }

/* FAQ */
.faq { display: grid; gap: 10px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 0 20px; }
.faq summary { cursor: pointer; padding: 16px 0; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 22px/1 var(--mono); color: var(--ink-3); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0 0 16px; color: var(--ink-2); }

/* Footer */
footer { margin-top: 96px; border-top: 1px solid var(--line); padding: 36px 0 44px; color: var(--ink-3); font-size: 14.5px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 18px 40px; justify-content: space-between; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
footer a { color: var(--ink-2); text-decoration: none; }
footer a:hover { color: var(--ink); text-decoration: underline; }
footer p { margin: 0; max-width: 34em; }