:root {
  --bg: #0b0907;
  --ink: #f1e8da;
  --muted: #a89a86;
  --amber: #ffad5a;
  --cool: #8fd3e8;
  --line: rgba(241, 232, 218, 0.16);
  --serif: ui-serif, "Iowan Old Style", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "STSong", Georgia, serif;
  --sans: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { background: var(--bg); color: var(--ink); scroll-behavior: smooth; }
html[data-lang="zh"] .en, html[data-lang="en"] .zh { display: none; }

body {
  margin: 0;
  font: 17px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }
code { font: 0.9em var(--mono); color: var(--amber); }

#field {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.no-gl body {
  background:
    radial-gradient(60% 50% at 70% 45%, rgba(255, 173, 90, 0.16), transparent 70%),
    radial-gradient(40% 35% at 72% 48%, rgba(241, 232, 218, 0.10), transparent 70%),
    var(--bg);
}
.no-gl #field, .no-gl #labels { display: none; }

.shade {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, rgba(11, 9, 7, 0.9) 0%, rgba(11, 9, 7, 0.62) 30%, rgba(11, 9, 7, 0) 52%);
}

#labels { position: fixed; inset: 0; pointer-events: none; }
.client {
  position: absolute;
  left: 0;
  top: 0;
  font: 12px/1 var(--mono);
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
  opacity: 0;
  will-change: transform, opacity;
}

.client.ver { color: rgba(241, 232, 218, 0.62); font-size: 11px; }
.client.ver.major { color: var(--amber); }

.bar {
  position: fixed;
  z-index: 3;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px max(20px, 4vw);
  /* opaque enough that a scrolling list passes under it cleanly */
  background: linear-gradient(180deg, rgba(11, 9, 7, 0.96) 0%, rgba(11, 9, 7, 0.9) 62%, rgba(11, 9, 7, 0) 100%);
}
.mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font: 600 18px/1 var(--serif);
  text-decoration: none;
}
.mark svg { width: 26px; height: 26px; }
.bar nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.bar nav a { text-decoration: none; color: var(--muted); }
.bar nav a:hover { color: var(--ink); }
.lang {
  font: 13px/1 var(--mono);
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  cursor: pointer;
}
.lang:hover { border-color: var(--amber); }

.dots {
  position: fixed;
  z-index: 3;
  right: max(16px, 2.2vw);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dots a {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(241, 232, 218, 0.22);
  transition: background 0.3s, transform 0.3s;
}
.dots a.on { background: var(--amber); transform: scale(1.35); }

main { position: relative; z-index: 2; }

section {
  position: relative;
  min-height: 140vh;
  padding: 0 max(24px, 7vw);
}
#hero { min-height: 120vh; }
#install { min-height: 120vh; }

.copy {
  position: sticky;
  top: 0;
  min-height: 100vh;
  max-width: 31rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 96px 0 72px;
}

h1, h2 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
}
h1 { font-size: clamp(2.4rem, 4.6vw, 4rem); line-height: 1.08; }
h1, h2 { text-wrap: balance; }
.copy p { text-wrap: pretty; }
h2 { font-size: clamp(1.8rem, 3.3vw, 2.7rem); line-height: 1.18; }
html[data-lang="zh"] h1 { letter-spacing: 0.02em; line-height: 1.2; font-size: clamp(2.2rem, 4.1vw, 3.5rem); }
#hero .copy { max-width: 34rem; }
#recall .copy { max-width: 35rem; }
html[data-lang="zh"] h2 { letter-spacing: 0.02em; line-height: 1.3; }

p { margin: 0 0 16px; }
.copy > p:not(.kicker):not(.step):not(.actions):not(.hint):not(.note) { color: rgba(241, 232, 218, 0.86); }

.kicker, .step {
  font: 13px/1.4 var(--mono);
  letter-spacing: 0.06em;
  color: var(--amber);
  margin-bottom: 18px;
}
.lede { font-size: 1.12rem; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 12px; }
.btn {
  display: inline-block;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.2;
}
.btn:hover { border-color: var(--amber); }
.btn.primary { background: var(--amber); border-color: var(--amber); color: #1a120a; font-weight: 600; }
.btn.primary:hover { background: #ffc07e; }

.hint {
  margin-top: 40px;
  font: 13px/1 var(--mono);
  letter-spacing: 0.12em;
  color: rgba(241, 232, 218, 0.8);
}

.chips, .facts {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.chips li, .facts li {
  font: 12.5px/1 var(--mono);
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: rgba(11, 9, 7, 0.55);
}
.facts li { border-color: rgba(255, 173, 90, 0.35); }

.sample { margin: 10px 0 0; }
.sample pre, pre.cmd {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  font: 12px/1.6 var(--mono);
  color: rgba(241, 232, 218, 0.9);
  background: rgba(20, 16, 12, 0.78);
  border: 1px solid rgba(255, 173, 90, 0.22);
  border-radius: 8px;
}
.sample pre { font-size: 10.5px; max-width: min(46rem, calc(100vw - 2 * max(24px, 7vw))); }
.sample .q { color: var(--cool); }
.sample figcaption { margin-top: 8px; font: 12px/1.4 var(--mono); color: var(--muted); }
pre.cmd { font-size: 13px; margin: 6px 0 14px; color: var(--ink); }
.note { font-size: 15px; color: var(--muted); }

/* release history and failure log: taller than a screen, so they scroll instead of sticking */
.reading .copy { position: static; min-height: 0; max-width: 36rem; padding: 120px 0 96px; }
.log { list-style: none; margin: 10px 0 20px; padding: 0 0 0 18px; border-left: 1px solid var(--line); text-shadow: 0 1px 12px rgba(11, 9, 7, 0.9); }
.log li { position: relative; margin: 0 0 18px; }
.log li::before { content: ""; position: absolute; left: -22px; top: 6px; width: 7px; height: 7px; border-radius: 50%; background: rgba(241, 232, 218, 0.35); }
.log li.major::before { background: var(--amber); }
.log p { margin: 0; font-size: 15px; line-height: 1.65; color: rgba(241, 232, 218, 0.86); }
.log p.when { margin-bottom: 4px; font: 12.5px/1.4 var(--mono); letter-spacing: 0.04em; color: var(--amber); }
.log b { font-weight: 600; color: var(--ink); }
.log .k { margin: 0 6px 0 2px; font: 11.5px/1 var(--mono); letter-spacing: 0.04em; color: var(--cool); }
.note a { color: var(--ink); }

footer { margin-top: 28px; font-size: 13.5px; line-height: 1.7; color: var(--muted); }
footer a { color: var(--ink); }

@media (max-width: 759px), (max-aspect-ratio: 9/10) {
  body { font-size: 16px; }
  .shade {
    background: linear-gradient(180deg, rgba(11, 9, 7, 0) calc(var(--fade, 50vh) - 90px), rgba(11, 9, 7, 0.82) calc(var(--fade, 50vh) - 12px), rgba(11, 9, 7, 0.94) calc(var(--fade, 50vh) + 60px));
  }
  .dots { display: none; }
  .client { font-size: 11px; letter-spacing: 0.02em; }
  section { padding: 0 22px; }
  .copy {
    justify-content: flex-end;
    max-width: none;
    padding: 0 0 calc(40px + env(safe-area-inset-bottom));
    min-height: 100vh;
  }
  #hero .copy { padding-bottom: calc(28px + env(safe-area-inset-bottom)); }
  .copy { padding-top: 76px; }
  #install { min-height: 100vh; }
  #install .copy { position: static; min-height: 0; padding-top: 88px; }
  .reading { min-height: 100vh; }
  .reading .copy { padding: 88px 0 calc(40px + env(safe-area-inset-bottom)); justify-content: flex-start; }
  .log p { font-size: 14.5px; }
  h1 { font-size: clamp(2.1rem, 9vw, 2.8rem); }
  h2 { font-size: clamp(1.55rem, 6.6vw, 2rem); }
  .lede { font-size: 1.02rem; }
  .hint { display: none; }
  .sample pre { font-size: 10.5px; max-width: calc(100vw - 44px); }
  .bar { padding: 14px 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dots a { transition: none; }
}