/* Lag Lens landing page. Self-contained; no external fonts or scripts. */

:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --bg-elev: #ffffff;
  --bg-code: #eef1f5;
  --fg: #1a1d22;
  --fg-muted: #5b6370;
  --line: #d9dde3;
  --accent: #2563eb;
  --accent-fg: #ffffff;
  --accent-soft: #dbe6ff;
  --ok: #15803d;
  --radius: 10px;
  --gutter: 16px;
  --maxw: 880px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1216;
    --bg-elev: #171b21;
    --bg-code: #1e242c;
    --fg: #e6e9ee;
    --fg-muted: #9aa3b0;
    --line: #2a313b;
    --accent: #4f8cff;
    --accent-fg: #0b1220;
    --accent-soft: #1b2a47;
    --ok: #4ade80;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1216;
  --bg-elev: #171b21;
  --bg-code: #1e242c;
  --fg: #e6e9ee;
  --fg-muted: #9aa3b0;
  --line: #2a313b;
  --accent: #4f8cff;
  --accent-fg: #0b1220;
  --accent-soft: #1b2a47;
  --ok: #4ade80;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 var(--font);
  overflow-x: hidden;
}
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
code, kbd, pre {
  font-family: var(--mono);
  font-size: 0.92em;
}
code {
  background: var(--bg-code);
  padding: 0.1em 0.35em;
  border-radius: 5px;
  overflow-wrap: anywhere;
}
pre code { background: none; padding: 0; }
kbd {
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 0 0.4em;
  background: var(--bg-elev);
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}
.skip:focus {
  left: var(--gutter);
  top: var(--gutter);
  background: var(--bg-elev);
  padding: 0.5em 1em;
  z-index: 10;
}

/* Hero */
.hero {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--accent-soft) 0%, var(--bg) 100%);
  padding: 2.5rem 0 2rem;
}
.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--fg-muted);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}
.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.1;
  display: flex;
  align-items: center;
  gap: 0.4em;
}
.mark {
  display: inline-block;
  width: 0.8em;
  height: 0.8em;
  border-radius: 50%;
  border: 0.14em solid var(--accent);
  position: relative;
  flex: none;
}
.mark::after {
  content: "";
  position: absolute;
  inset: 0.18em;
  border-radius: 50%;
  background: var(--accent);
}
.lede {
  margin: 0 0 1.25rem;
  font-size: 1.1rem;
  max-width: 60ch;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.6em 1.1em;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
  line-height: 1.2;
}
.btn:hover { border-color: var(--accent); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}
.btn.big { font-size: 1.1rem; padding: 0.75em 1.4em; }

/* Sections */
main section {
  padding: 2rem 0 0.5rem;
  border-bottom: 1px solid var(--line);
}
main section:last-of-type { border-bottom: 0; }
h2 {
  margin: 0 0 0.75rem;
  font-size: 1.5rem;
  line-height: 1.2;
}
h3 { margin: 1.5rem 0 0.5rem; font-size: 1.15rem; }
h4 { margin: 1rem 0 0.4rem; font-size: 1rem; }
p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.3rem; margin: 0 0 1rem; }
li { margin: 0.3rem 0; }
.muted { color: var(--fg-muted); font-size: 0.95rem; }

/* Copyable command blocks */
.cmd {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem 0.7rem;
  margin: 0 0 0.9rem;
}
.cmd-label {
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin-bottom: 0.3rem;
  padding-right: 4.5rem;
}
.cmd pre {
  margin: 0;
  padding: 0.55rem 0.7rem;
  background: var(--bg-code);
  border-radius: 7px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  font-size: 0.95rem;
  line-height: 1.5;
}
.copy {
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  font: inherit;
  font-size: 0.8rem;
  padding: 0.25em 0.7em;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  color: var(--fg);
  cursor: pointer;
}
.copy:hover { border-color: var(--accent); color: var(--accent); }

/* Download card */
.download-card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  margin-bottom: 0.5rem;
}
.meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.3rem 1rem;
  margin: 1rem 0 0.75rem;
}
.meta dt { color: var(--fg-muted); }
.meta dd { margin: 0; min-width: 0; }
.hash {
  display: inline-block;
  max-width: 100%;
  word-break: break-all;
  font-size: 0.82em;
}

.checks li { padding-left: 0.15rem; }

.grid2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 2rem;
}
@media (min-width: 700px) {
  .grid2 { grid-template-columns: 1fr 1fr; }
}
.grid2 h3 { margin-top: 0.5rem; }

details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 0.6rem 0.9rem;
  margin: 0 0 0.7rem;
}
details > summary {
  cursor: pointer;
  font-weight: 600;
  padding: 0.2rem 0;
}
details > :not(summary) { margin-top: 0.6rem; }
details ul:last-child, details ol:last-child, details p:last-child { margin-bottom: 0.3rem; }

.changelog {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
}
.changelog h3:first-child { margin-top: 0.2rem; }
.changelog p:last-child, .changelog ul:last-child { margin-bottom: 0.2rem; }

footer {
  padding: 1.5rem var(--gutter) 2.5rem;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

@media (max-width: 480px) {
  .meta { grid-template-columns: 1fr; gap: 0.1rem 0; }
  .meta dt { margin-top: 0.4rem; }
  .btn.big { width: 100%; text-align: center; }
}