/* Bern's site: dark, monospace where it is code, the logo's blue as the
   one accent. System fonts only, so it loads fast everywhere. */

:root {
  --bg: #090d15;
  --bg-raised: #0e1420;
  --panel: #111a29;
  --line: rgba(232, 244, 255, 0.08);
  --line-strong: rgba(232, 244, 255, 0.16);
  --text: #e8f4ff;
  --muted: #8b9bb4;
  --faint: #56657e;
  --accent: #4a8bef;
  --accent-soft: rgba(74, 139, 239, 0.14);
  --ok: #6fd3a0;
  --err: #ff7a85;
  --warn: #f2c46d;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --radius: 10px;
  --wide: 1160px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
code, pre, kbd { font-family: var(--mono); }
::selection { background: rgba(74, 139, 239, 0.35); }

/* Both languages are in the page; the one not chosen is hidden. */
[data-lang="en"] [lang="zh-CN"],
[data-lang="zh"] [lang="en"] { display: none !important; }

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 24px; }

/* ---------- Navigation ---------- */
.nav {
  position: sticky; top: 0; z-index: 10;
  background: rgba(9, 13, 21, 0.78);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap { display: flex; align-items: center; gap: 28px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font: 600 17px var(--mono); letter-spacing: -0.02em; }
.brand img { width: 26px; height: 26px; }
.brand .ver { font-weight: 400; font-size: 12px; color: var(--faint); }
.nav-links { display: flex; gap: 22px; margin-left: auto; font: 13px var(--mono); color: var(--muted); }
.nav-links a:hover, .lang button:hover { color: var(--text); }
.lang { display: flex; border: 1px solid var(--line-strong); border-radius: 7px; overflow: hidden; }
.lang button {
  background: none; border: 0; color: var(--muted); cursor: pointer;
  font: 12px var(--mono); padding: 5px 10px;
}
[data-lang="en"] .lang [data-set="en"], [data-lang="zh"] .lang [data-set="zh"] { background: var(--accent-soft); color: var(--text); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 30% 30%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 30% 30%, #000 30%, transparent 75%);
}
.hero::after {
  content: ""; position: absolute; width: 720px; height: 720px; right: -220px; top: -260px; pointer-events: none;
  background: radial-gradient(circle, rgba(74, 139, 239, 0.22), transparent 62%);
}
.hero .wrap {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.02fr 1fr; gap: 56px; align-items: center;
  padding-top: 88px; padding-bottom: 96px;
}
.eyebrow { font: 12px var(--mono); color: var(--accent); letter-spacing: 0.04em; margin: 0 0 22px; }
.eyebrow .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--ok); margin-right: 8px; box-shadow: 0 0 10px var(--ok); }
h1 {
  font-size: clamp(38px, 5.4vw, 64px); line-height: 1.06; letter-spacing: -0.035em;
  margin: 0 0 24px; font-weight: 750;
}
h1 .accent { color: var(--accent); }
.lede { font-size: 18px; color: var(--muted); max-width: 34em; margin: 0 0 36px; }
.lede code { color: var(--text); font-size: 0.92em; }

.install {
  display: flex; align-items: center; gap: 12px; max-width: 460px;
  background: var(--panel); border: 1px solid var(--line-strong); border-radius: var(--radius);
  padding: 13px 14px 13px 18px; font: 15px var(--mono);
}
.install .prompt { color: var(--faint); }
.install code { flex: 1; white-space: nowrap; overflow-x: auto; }
.cursor { display: inline-block; width: 8px; height: 1.1em; background: var(--accent); vertical-align: -0.18em; margin-left: 2px; animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.copy {
  background: transparent; border: 1px solid var(--line-strong); color: var(--muted);
  border-radius: 6px; padding: 4px 10px; font: 12px var(--mono); cursor: pointer;
}
.copy:hover { color: var(--text); border-color: var(--accent); }
.copy.done { color: var(--ok); border-color: var(--ok); }
.cta { display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; font: 500 14px var(--mono);
  padding: 10px 18px; border-radius: 8px; border: 1px solid var(--line-strong); color: var(--text);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: #5b97f2; }
.btn:not(.primary):hover { border-color: var(--accent); }

/* ---------- Code windows ---------- */
.window {
  background: var(--bg-raised); border: 1px solid var(--line-strong); border-radius: 12px;
  overflow: hidden; box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(74, 139, 239, 0.05);
}
.window .bar {
  display: flex; align-items: center; gap: 8px; padding: 11px 14px;
  border-bottom: 1px solid var(--line); font: 12px var(--mono); color: var(--faint);
}
.window .bar i { width: 11px; height: 11px; border-radius: 50%; background: #2a3446; }
.window .bar span { margin-left: 8px; }
.window pre.term { white-space: pre-wrap; overflow-wrap: anywhere; }
.window pre { margin: 0; padding: 20px 22px; overflow-x: auto; font-size: 13.5px; line-height: 1.7; }
.tabs { display: flex; gap: 2px; padding: 0 10px; border-bottom: 1px solid var(--line); overflow-x: auto; }
.tabs button {
  background: none; border: 0; border-bottom: 2px solid transparent; color: var(--faint);
  font: 12.5px var(--mono); padding: 11px 12px 10px; cursor: pointer; white-space: nowrap;
}
.tabs button:hover { color: var(--muted); }
.tabs button.on { color: var(--text); border-bottom-color: var(--accent); }
[data-pane]:not(.on) { display: none; }

/* Rust and shell, colored by hand. */
.k { color: #8fb8ff; }          /* keywords */
.t { color: #e8f4ff; font-weight: 600; } /* types */
.m { color: #f2c46d; }          /* macros and attributes */
.s { color: #8be0b4; }          /* strings */
.n { color: #f0a3c0; }          /* numbers */
.c { color: var(--faint); }     /* comments */
.p { color: var(--faint); }     /* prompts */
.o { color: var(--muted); }     /* output */
.e { color: var(--err); font-weight: 600; }
.g { color: var(--ok); }

/* ---------- Sections ---------- */
section { padding: 104px 0; border-bottom: 1px solid var(--line); }
.label { font: 12px var(--mono); color: var(--accent); letter-spacing: 0.06em; margin: 0 0 14px; }
h2 { font-size: clamp(28px, 3.4vw, 40px); line-height: 1.15; letter-spacing: -0.025em; margin: 0 0 18px; font-weight: 720; }
.sub { color: var(--muted); font-size: 17px; max-width: 40em; margin: 0; }
.sub code, .row p code, .step p code { color: var(--text); font-size: 0.9em; background: var(--panel); padding: 1px 6px; border-radius: 5px; border: 1px solid var(--line); }

/* Platforms */
.targets { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; margin: 44px 0 28px; }
.targets div { background: var(--bg); padding: 18px 16px; }
.targets b { display: block; font: 600 15px var(--sans); }
.targets span { font: 12px var(--mono); color: var(--muted); }
.shots .tabs { border: 0; padding: 0; margin-bottom: 18px; }
.shots .tabs button { border: 1px solid var(--line); border-radius: 7px; margin-right: 6px; padding: 7px 12px; }
.shots .tabs button.on { border-color: var(--accent); background: var(--accent-soft); }
.shot { display: flex; justify-content: center; background: var(--bg-raised); border: 1px solid var(--line); border-radius: 14px; padding: 36px; }
.shot img { max-height: 560px; width: auto; border-radius: 10px; box-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.9); }
.caption { font: 13px var(--mono); color: var(--faint); margin-top: 16px; text-align: center; }

/* Feature rows: words on one side, code on the other. */
.row { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: center; }
.row + .row { margin-top: 112px; }
.row.flip > :first-child { order: 2; }
.row h3 { font-size: 26px; letter-spacing: -0.02em; line-height: 1.25; margin: 0 0 14px; }
.row p { color: var(--muted); margin: 0 0 16px; }
.points { list-style: none; padding: 0; margin: 20px 0 0; font-size: 15px; }
.points li { padding: 9px 0 9px 22px; border-top: 1px solid var(--line); position: relative; color: var(--muted); }
.points li::before { content: "›"; position: absolute; left: 4px; color: var(--accent); font-family: var(--mono); }
.points b { color: var(--text); font-weight: 600; }

/* Measured */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 48px; }
.stat { background: var(--bg-raised); border: 1px solid var(--line); border-radius: 12px; padding: 26px 26px 22px; }
.stat h4 { margin: 0 0 18px; font: 13px var(--mono); color: var(--muted); }
.stat dl { margin: 0; display: grid; gap: 14px; }
.stat dl div { display: flex; justify-content: space-between; align-items: baseline; border-bottom: 1px dashed var(--line); padding-bottom: 10px; }
.stat dt { font-size: 14px; color: var(--muted); }
.stat dd { margin: 0; font: 600 26px var(--mono); letter-spacing: -0.03em; }
.stat dd small { font-size: 14px; color: var(--muted); font-weight: 400; margin-left: 3px; }
.stat dd .vs { color: var(--faint); margin-left: 10px; font-size: 13px; }
.note { font: 12.5px var(--mono); color: var(--faint); margin-top: 18px; }

/* Built with Bern */
.case { display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px; align-items: center; background: var(--bg-raised); border: 1px solid var(--line); border-radius: 16px; padding: 44px; margin-top: 44px; }
.case h3 { font-size: 26px; margin: 0 0 6px; }
.case .tag { font: 12px var(--mono); color: var(--muted); margin-bottom: 18px; }
.case p { color: var(--muted); margin: 0 0 20px; }
.case .nums { display: flex; gap: 32px; margin-bottom: 26px; font-family: var(--mono); }
.case .nums b { display: block; font-size: 24px; }
.case .nums span { font-size: 12px; color: var(--faint); }
.case .pics { display: flex; gap: 18px; justify-content: center; align-items: flex-end; }
.case .pics img { border-radius: 12px; border: 1px solid var(--line); max-height: 380px; width: auto; }
.links { display: flex; gap: 20px; font: 13px var(--mono); flex-wrap: wrap; }
.links a { color: var(--accent); }
.links a:hover { text-decoration: underline; }

/* Get started */
.steps { counter-reset: step; display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: 44px; }
.step { background: var(--bg-raised); border: 1px solid var(--line); border-radius: 12px; padding: 24px 24px 20px; }
.step h4 { margin: 0 0 6px; font-size: 17px; }
.step h4::before { counter-increment: step; content: counter(step, decimal-leading-zero); font: 12px var(--mono); color: var(--accent); margin-right: 10px; vertical-align: 2px; }
.step p { color: var(--muted); font-size: 14.5px; margin: 0 0 14px; }
.step pre { margin: 0; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; font-size: 13.5px; overflow-x: auto; }

/* Footer */
footer { padding: 56px 0 64px; color: var(--faint); font: 13px var(--mono); }
footer .wrap { display: flex; gap: 24px; justify-content: space-between; flex-wrap: wrap; }
footer .links a { color: var(--muted); }

/* ---------- Narrow screens ---------- */
@media (max-width: 900px) {
  .hero .wrap, .row, .case { grid-template-columns: 1fr; gap: 40px; }
  .row.flip > :first-child { order: 0; }
  .targets { grid-template-columns: repeat(3, 1fr); }
  .stats, .steps { grid-template-columns: 1fr; }
  .nav-links .wide { display: none; }
  .case { padding: 28px; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .hero .wrap { padding-top: 56px; padding-bottom: 64px; }
  section { padding: 72px 0; }
  .targets { grid-template-columns: repeat(2, 1fr); }
  .nav .wrap { gap: 14px; }
  .nav-links { gap: 14px; }
  .brand .ver, .nav-links .go { display: none; }
  .shot { padding: 16px; }
  .case .pics img { max-height: 260px; }
  .window pre { font-size: 12px; padding: 16px; }
}