/* Ratica — paper, ink and a little comic-book colour. System fonts only. */
:root {
  --paper: #f6efe1;
  --paper-2: #efe4cf;
  --card: #fffaf0;
  --ink: #1d1a16;
  --ink-soft: #4d453b;
  --line: #1d1a16;
  --hair: #d9cbb0;
  --red: #d7402b;         /* comic red */
  --red-ink: #ffffff;
  --yellow: #f6c445;      /* highlighter */
  --blue: #1c6a86;        /* the app icon's teal */
  --dot: rgba(29, 26, 22, 0.07);
  --shadow: 6px 6px 0 var(--ink);
  --radius: 14px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Charter, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #17130f;
    --paper-2: #1f1a14;
    --card: #262019;
    --ink: #f3ead8;
    --ink-soft: #c9bca4;
    --line: #f3ead8;
    --hair: #3d342a;
    --red: #ff6b50;
    --red-ink: #1a0d08;
    --yellow: #f6c445;
    --blue: #6cc0dd;
    --dot: rgba(243, 234, 216, 0.06);
    --shadow: 6px 6px 0 #000;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--paper);
  background-image: radial-gradient(var(--dot) 1px, transparent 1.4px);
  background-size: 14px 14px;
  font: 17px/1.6 var(--sans);
  -webkit-text-size-adjust: 100%;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration-color: var(--red); text-decoration-thickness: 2px; text-underline-offset: 3px; }
a:hover { color: var(--red); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 6px; }
button { font: inherit; }

h1, h2, h3 { font-family: var(--serif); line-height: 1.1; margin: 0 0 0.45em; font-weight: 700; }
h1 { font-size: clamp(2.6rem, 8vw, 4.8rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.9rem, 5vw, 3rem); letter-spacing: -0.015em; }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }

.wrap { width: min(1160px, 100% - 32px); margin-inline: auto; }
.narrow { width: min(820px, 100% - 32px); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--card); padding: 8px 12px; z-index: 20; }
.skip:focus { left: 16px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* header */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 2px solid var(--line); }
.top-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 700 1.4rem var(--serif); }
.top nav { display: flex; gap: 20px; align-items: center; }
.top nav a { text-decoration: none; font-weight: 600; font-size: 0.95rem; }
.top nav a:hover { text-decoration: underline; }
@media (max-width: 640px) { .top nav a:not(.gh) { display: none; } }

section { padding: 72px 0; }
.paper { background: var(--paper-2); border-block: 2px solid var(--line); }
.kicker { display: inline-block; font: 800 0.8rem var(--sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--red); margin-bottom: 10px; }
.sub { color: var(--ink-soft); max-width: 46em; }
.fine { color: var(--ink-soft); font-size: 0.85rem; margin-top: 14px; }

/* hero */
.hero { padding: 48px 0 80px; overflow-x: clip; }
.hero-grid { display: grid; gap: 48px; align-items: center; }
@media (min-width: 960px) { .hero-grid { grid-template-columns: 1.05fr 1fr; align-items: start; } }
.lead { font-size: 1.2rem; color: var(--ink-soft); max-width: 32em; }
.ink-hl { background: linear-gradient(transparent 58%, var(--yellow) 58%, var(--yellow) 92%, transparent 92%); padding: 0 0.1em; }
@media (prefers-color-scheme: dark) { .ink-hl { background: none; color: var(--yellow); } }

.bubble {
  position: relative; display: inline-block; margin-bottom: 22px; padding: 8px 16px;
  background: var(--card); border: 2px solid var(--line); border-radius: 18px;
  font-weight: 700; font-size: 0.95rem; box-shadow: 3px 3px 0 var(--line);
}
.bubble::after {
  content: ""; position: absolute; left: 22px; bottom: -11px; width: 18px; height: 18px;
  background: var(--card); border-right: 2px solid var(--line); border-bottom: 2px solid var(--line);
  transform: skewX(-25deg) rotate(45deg);
}

/* download box */
.download { position: relative; z-index: 5; margin-top: 28px; max-width: 460px; }
.btn-dl {
  display: flex; flex-direction: column; gap: 2px; padding: 16px 24px; border-radius: var(--radius);
  background: var(--red); color: var(--red-ink); text-decoration: none; border: 2px solid var(--line);
  box-shadow: var(--shadow); transition: transform .12s ease, box-shadow .12s ease;
}
.btn-dl:hover { color: var(--red-ink); transform: translate(-2px, -2px); box-shadow: 8px 8px 0 var(--line); }
.btn-dl:active { transform: translate(3px, 3px); box-shadow: 2px 2px 0 var(--line); }
.dl-label { font: 800 1.35rem var(--sans); }
.dl-meta { font-size: 0.92rem; opacity: 0.92; }

.other-os { position: relative; margin-top: 18px; border: 2px solid var(--line); border-radius: var(--radius); background: var(--card); }
/* The open menu floats over the page: opening it never moves anything else. */
.os-panel {
  position: absolute; z-index: 20; left: -2px; right: -2px; top: calc(100% + 6px);
  background: var(--card); border: 2px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); max-height: min(70vh, 420px); overflow-y: auto; padding-top: 6px;
}
.other-os summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 18px; font-weight: 700;
}
.other-os summary::-webkit-details-marker { display: none; }
.chev { width: 12px; height: 12px; border-right: 3px solid var(--ink); border-bottom: 3px solid var(--ink); transform: rotate(45deg); margin-top: -6px; transition: transform .15s ease; flex: none; }
.other-os[open] .chev { transform: rotate(-135deg); margin-top: 4px; }
.os-list { list-style: none; margin: 0; padding: 0 10px 6px; }
.os-list a { display: flex; flex-direction: column; padding: 10px 12px; border-radius: 10px; text-decoration: none; }
.os-list a:hover { background: var(--paper-2); color: var(--ink); }
.os-list a.current { display: none; }
.os-list span { font-size: 0.88rem; color: var(--ink-soft); }
.pkg { padding: 4px 22px 8px; }
.pkg h3 { font: 700 0.95rem var(--sans); margin: 10px 0 6px; }
.pkg pre { margin: 0 0 8px; padding: 10px 12px; background: var(--paper-2); border: 1px solid var(--hair); border-radius: 8px; overflow-x: auto; font-size: 0.88rem; }
.all { margin: 0; padding: 6px 22px 14px; font-size: 0.9rem; }
.ver { margin-top: 12px; color: var(--ink-soft); font-size: 0.9rem; min-height: 1.6em; }

/* hero art: two sheets of paper */
.hero-art { position: relative; min-height: 420px; }
.sheet { position: absolute; width: 74%; background: #fff; border: 2px solid var(--line); border-radius: 6px; overflow: hidden; box-shadow: var(--shadow); }
.sheet img { width: 100%; }
.sheet-back { left: 0; top: 0; transform: rotate(-4deg); }
.sheet-front { right: 0; top: 70px; transform: rotate(3deg); }
.stamp {
  position: absolute; right: 6%; bottom: 0; transform: rotate(-8deg);
  background: var(--yellow); color: #1d1a16; border: 2px solid var(--line); padding: 8px 16px; border-radius: 10px;
  font: 800 1.05rem var(--sans); text-transform: uppercase; letter-spacing: 0.06em; box-shadow: 4px 4px 0 var(--line);
}
@media (max-width: 959px) { .hero-art { min-height: 0; height: 74vw; max-height: 520px; } }

/* compare slider */
.langs { display: flex; gap: 10px; flex-wrap: wrap; margin: 22px 0 18px; }
.lang { padding: 8px 16px; border-radius: 999px; border: 2px solid var(--line); background: var(--card); color: var(--ink); font-weight: 700; cursor: pointer; }
.lang.on { background: var(--ink); color: var(--paper); }
.compare { position: relative; max-width: 900px; border: 2px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: #fff; --pos: 50%; }
.compare img { width: 100%; }
.c-after { position: absolute; inset: 0; clip-path: inset(0 0 0 var(--pos)); }
.c-handle { position: absolute; top: 0; bottom: 0; left: var(--pos); width: 4px; margin-left: -2px; background: var(--red); pointer-events: none; }
.c-handle::after {
  content: "↔"; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: 44px; height: 44px; display: grid; place-items: center; border-radius: 50%;
  background: var(--red); color: #fff; font-weight: 800; border: 2px solid #1d1a16;
}
.compare input[type=range] { position: absolute; inset: 0; width: 100%; height: 100%; margin: 0; opacity: 0; cursor: ew-resize; }
.compare input[type=range]:focus-visible + * { outline: none; }
.compare:focus-within { outline: 3px solid var(--blue); outline-offset: 3px; }
.c-tag { position: absolute; top: 12px; padding: 4px 12px; border-radius: 999px; font-weight: 800; font-size: 0.85rem; border: 2px solid #1d1a16; pointer-events: none; }
.c-tag.left { left: 12px; background: #fff; color: #1d1a16; }
.c-tag.right { right: 12px; background: var(--yellow); color: #1d1a16; }

/* how */
.how-grid { display: grid; gap: 40px; margin: 28px 0 24px; align-items: start; }
@media (min-width: 960px) { .how-grid { grid-template-columns: 0.9fr 1.1fr; } }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 22px; }
.steps li { display: flex; gap: 16px; align-items: flex-start; }
.steps p { color: var(--ink-soft); margin: 0; }
.num {
  flex: none; width: 46px; height: 46px; display: grid; place-items: center; border-radius: 50%;
  background: var(--yellow); color: #1d1a16; border: 2px solid var(--line); font: 800 1.2rem var(--sans); box-shadow: 3px 3px 0 var(--line);
}
.shots { display: grid; gap: 18px; grid-template-columns: 1fr 1fr; }
@media (max-width: 560px) { .shots { grid-template-columns: 1fr; } }
.shot { margin: 0; }
.shot img { border: 2px solid var(--line); border-radius: 10px; box-shadow: 4px 4px 0 var(--line); background: #1e1e1e; }
.shot figcaption { font-size: 0.88rem; color: var(--ink-soft); margin-top: 10px; }

/* features */
.feats { display: grid; gap: 20px; margin-top: 28px; }
@media (min-width: 700px) { .feats { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .feats { grid-template-columns: repeat(3, 1fr); } }
.feat { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: 4px 4px 0 var(--line); }
.feat:nth-child(3n+1) { border-top: 8px solid var(--red); }
.feat:nth-child(3n+2) { border-top: 8px solid var(--yellow); }
.feat:nth-child(3n) { border-top: 8px solid var(--blue); }
.feat p { color: var(--ink-soft); margin: 0; }

/* news */
.news { display: grid; gap: 28px; }
@media (min-width: 900px) { .news { grid-template-columns: 0.8fr 1.2fr; } }
.news-body { background: var(--card); border: 2px solid var(--line); border-radius: var(--radius); padding: 24px 28px; box-shadow: var(--shadow); }
.news-body ul { margin: 0; padding-left: 1.2em; }
.news-body li { margin-bottom: 0.6em; }
.news-body h3 { font-size: 1.05rem; font-family: var(--sans); margin: 1em 0 0.4em; }
.news-body h3:first-child { margin-top: 0; }
.news-body code { background: var(--paper-2); padding: 1px 5px; border-radius: 4px; font-size: 0.9em; }
.link-arrow { font-weight: 700; }
.link-arrow::after { content: " →"; }

/* languages */
.chips { list-style: none; padding: 0; margin: 24px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.chips li { padding: 6px 14px; border: 2px solid var(--line); border-radius: 999px; background: var(--card); font-weight: 600; font-size: 0.95rem; }

/* requirements */
.req { display: grid; gap: 0; margin: 24px 0 18px; border: 2px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--card); max-width: 820px; }
.req-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 14px 20px; border-top: 1px solid var(--hair); flex-wrap: wrap; }
.req-row:first-child { border-top: 0; }
.tag { font-size: 0.85rem; font-weight: 700; padding: 3px 10px; border-radius: 999px; border: 2px solid var(--line); }
.tag.good { background: var(--blue); color: #fff; }
.tag.try { background: var(--yellow); color: #1d1a16; }
.tag.slow { background: var(--card); color: var(--ink); }
@media (prefers-color-scheme: dark) { .tag.good { color: #10222a; } }

/* faq */
.qa { border: 2px solid var(--line); border-radius: var(--radius); background: var(--card); margin-top: 14px; }
.qa summary { cursor: pointer; padding: 16px 20px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "+"; font-size: 1.4rem; line-height: 1; color: var(--red); }
.qa[open] summary::after { content: "–"; }
.qa p { padding: 0 20px 16px; margin: 0; color: var(--ink-soft); }

/* cta */
.cta-box { background: var(--ink); color: var(--paper); border-radius: 22px; padding: clamp(28px, 6vw, 56px); box-shadow: 8px 8px 0 var(--red); }
.cta-box p { color: color-mix(in srgb, var(--paper) 80%, var(--ink)); max-width: 40em; }
.cta-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.btn { display: inline-block; padding: 12px 22px; border-radius: 999px; border: 2px solid var(--paper); color: var(--paper); text-decoration: none; font-weight: 700; }
.btn:hover { background: var(--paper); color: var(--ink); }
.btn.solid { background: var(--red); border-color: var(--red); color: var(--red-ink); }
.btn.solid:hover { filter: brightness(1.08); color: var(--red-ink); background: var(--red); }

/* footer */
.foot { padding: 28px 0 40px; font-size: 0.95rem; color: var(--ink-soft); }
.foot-row { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.foot p { margin: 0; }

/* download (thank you) page */
.thanks { padding: 64px 0; }
.thanks .card-big { background: var(--card); border: 2px solid var(--line); border-radius: 22px; padding: clamp(24px, 5vw, 48px); box-shadow: var(--shadow); max-width: 760px; }
.thanks ol { padding-left: 1.3em; color: var(--ink-soft); }
.thanks li { margin-bottom: 0.5em; }
.thanks .btn-dl { display: inline-flex; margin: 8px 0 20px; }