/* AirLens landing page: the "Studio" design. Plain CSS, no build step. */

:root {
  color-scheme: dark;
  --bg: #0B0C0E;
  --bg-band: #0F1013;
  --surface: #131519;
  --well: #1E2127;
  --line: #262A31;
  --line-strong: #3A3F48;
  --text: #F2F3F5;
  --text-soft: #C4C9D2;
  --muted: #A3A9B4;
  --faint: #8B919C;
  --accent: #FF4B3E;        /* the "live" tally light */
  --accent-hover: #FF6F64;
  --on-accent: #0B0C0E;
  --sans: "Archivo", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", monospace;
  --radius: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--text); }
a:hover { color: var(--accent-hover); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }

h1, h2, h3 { margin: 0; }
p { margin: 0; }

.wrap { max-width: 1200px; margin: 0 auto; padding-inline: 24px; }
@media (max-width: 480px) { .wrap { padding-inline: 16px; } }

.mono { font-family: var(--mono); }

.skip {
  position: absolute; left: 16px; top: -48px; z-index: 10;
  padding: 10px 16px; border-radius: 10px;
  background: var(--accent); color: var(--on-accent); text-decoration: none; font-weight: 700;
}
.skip:focus { top: 16px; color: var(--on-accent); }

/* ---- Header -------------------------------------------------------------------------------- */

.header {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 16px; padding-block: 22px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; font-weight: 750; font-size: 20px; letter-spacing: -0.01em; font-stretch: 112%;
}
.brand img { width: 32px; height: 32px; }
.nav { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 28px; font-size: 15px; }
.nav a { text-decoration: none; color: var(--muted); padding-block: 10px; }
.nav a:hover { color: var(--text); }
.nav .nav-cta {
  color: var(--text); padding: 10px 18px; border: 1px solid var(--line-strong); border-radius: 999px;
}
.nav .nav-cta:hover { border-color: var(--text); }
.nav .nav-icon { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; padding: 0; border-radius: 999px; color: var(--muted); }
.nav .nav-icon:hover { color: var(--text); background: var(--surface); }

/* ---- Buttons ------------------------------------------------------------------------------- */

.btn {
  display: inline-flex; flex-direction: column; gap: 2px;
  padding: 16px 26px; border-radius: 14px; text-decoration: none; min-width: 220px;
  border: 1px solid transparent;
}
.btn-title { font-weight: 750; font-size: 18px; }
.btn-meta { font-family: var(--mono); font-size: 12.5px; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); color: var(--on-accent); }
.btn-ghost { border-color: var(--line-strong); color: var(--text); }
.btn-ghost .btn-meta { color: var(--muted); }
.btn-ghost:hover { border-color: var(--text); color: var(--text); }
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }

/* ---- Hero ---------------------------------------------------------------------------------- */

.hero { display: flex; flex-wrap: wrap; align-items: center; gap: 56px; padding-block: 72px 96px; }
.hero-copy { flex: 1 1 500px; min-width: 0; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}
.tally {
  width: 10px; height: 10px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 0 4px rgba(255, 75, 62, 0.18);
}
@media (prefers-reduced-motion: no-preference) {
  .tally { animation: tally 2.4s ease-in-out infinite; }
  @keyframes tally { 50% { box-shadow: 0 0 0 7px rgba(255, 75, 62, 0.08); } }
}
.hero h1 {
  margin-top: 24px; font-size: clamp(44px, 6vw, 80px); line-height: 0.98;
  font-weight: 800; letter-spacing: -0.035em; font-stretch: 108%; text-wrap: balance;
}
.lede { margin-top: 28px; max-width: 560px; font-size: 20px; color: var(--text-soft); }
.hero .btn-row { margin-top: 40px; }
.hero-note { margin-top: 14px; font-size: 14px; color: var(--faint); }

/* Phone, link, monitor. */
.diagram {
  flex: 1 1 460px; min-width: 0;
  background: var(--surface); border: 1px solid var(--line); border-radius: 22px;
  padding: 40px 24px; display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 14px;
}
.phone {
  width: 112px; height: 216px; flex-shrink: 0; padding: 10px;
  border: 2px solid var(--text); border-radius: 24px; display: flex; flex-direction: column; gap: 8px;
}
.phone-screen { flex: 1; border-radius: 14px; background: var(--well); padding: 8px; }
.phone-bar { height: 4px; width: 32px; border-radius: 4px; background: var(--line-strong); align-self: center; }
.live {
  display: inline-block; font-family: var(--mono); font-size: 10px; font-weight: 600;
  color: var(--on-accent); background: var(--accent); border-radius: 4px; padding: 2px 6px;
}
.link { flex: 1 1 64px; min-width: 64px; max-width: 160px; display: flex; flex-direction: column; gap: 10px; }
.link span { font-family: var(--mono); font-size: 12px; text-align: center; white-space: nowrap; }
.link span + span { color: var(--muted); }
.link-line { border-top: 2px dashed var(--accent); }
.monitor { display: flex; flex-direction: column; align-items: center; flex-shrink: 0; }
.monitor-frame { width: 236px; height: 150px; padding: 10px; border: 2px solid var(--text); border-radius: 12px; }
.monitor-screen {
  height: 100%; border-radius: 6px; background: var(--well); padding: 10px;
  display: flex; flex-direction: column; justify-content: space-between;
  font-family: var(--mono); font-size: 11px;
}
.monitor-screen span:first-child { color: var(--muted); }
.monitor-screen span:last-child { align-self: flex-end; }
.monitor-neck { width: 14px; height: 22px; background: var(--text); }
.monitor-foot { width: 96px; height: 4px; border-radius: 4px; background: var(--text); }

@media (max-width: 640px) {
  .diagram { flex-direction: column; padding: 32px 20px; }
  .link { flex: none; width: auto; flex-direction: row; align-items: center; gap: 14px; }
  .link-line { border-top: 0; border-left: 2px dashed var(--accent); height: 56px; }
  .link span { text-align: left; }
}

/* ---- Numbers ------------------------------------------------------------------------------- */

.numbers { border-block: 1px solid var(--line); background: var(--bg-band); }
.numbers .wrap { padding-block: 56px 44px; }
.stats { display: flex; flex-wrap: wrap; gap: 40px; margin: 0; }
.stat { flex: 1 1 220px; }
.stat dd { margin: 0; font-family: var(--mono); font-size: 52px; font-weight: 600; letter-spacing: -0.03em; line-height: 1; }
.stat dt { margin-top: 12px; color: var(--muted); font-size: 15px; }
.stat { display: flex; flex-direction: column-reverse; justify-content: flex-end; }
.stat-accent dd { color: var(--accent); }
.footnote { margin-top: 36px; font-family: var(--mono); font-size: 12.5px; color: var(--faint); }

/* ---- Sections ------------------------------------------------------------------------------ */

.section { padding-block: 112px 16px; }
.section h2 {
  font-size: clamp(32px, 4vw, 48px); line-height: 1.05; font-weight: 800;
  letter-spacing: -0.03em; font-stretch: 108%;
}
.section-lede { margin-top: 14px; color: var(--muted); }

.steps { list-style: none; margin: 48px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 24px; }
.steps li { flex: 1 1 300px; border-top: 2px solid var(--text); padding-top: 24px; }
.step-no { font-family: var(--mono); font-size: 14px; color: var(--accent); }
.steps h3 { margin-top: 12px; font-size: 22px; font-weight: 750; }
.steps p { margin-top: 10px; color: var(--muted); }

.cards { margin-top: 48px; display: flex; flex-wrap: wrap; gap: 16px; }
.card { flex: 1 1 340px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.card svg { width: 26px; height: 26px; stroke: var(--accent); }
.card h3 { margin-top: 16px; font-size: 20px; font-weight: 750; }
.card p { margin-top: 8px; color: var(--muted); }

/* ---- Downloads ----------------------------------------------------------------------------- */

.downloads { margin-top: 44px; display: flex; flex-wrap: wrap; gap: 20px; }
.download {
  flex: 1 1 420px; background: var(--surface); border: 1px solid var(--line); border-radius: 20px;
  padding: 36px; display: flex; flex-direction: column; gap: 20px;
}
@media (max-width: 480px) { .download { padding: 28px 22px; } }
.download-head { display: flex; align-items: center; gap: 14px; }
.download-head svg { width: 34px; height: 34px; flex-shrink: 0; }
.download h3 { font-size: 26px; font-weight: 750; }
.facts { margin: 0; display: grid; grid-template-columns: max-content 1fr; gap: 8px 20px; font-size: 15px; }
.facts dt { color: var(--faint); font-family: var(--mono); font-size: 13px; padding-top: 2px; }
.facts dd { margin: 0; }
.facts .file { font-family: var(--mono); font-size: 13px; overflow-wrap: anywhere; }
.download .btn { margin-top: auto; align-self: flex-start; min-width: 0; }
.download .btn-title { font-size: 17px; }
.checksum { font-family: var(--mono); font-size: 11.5px; color: var(--faint); overflow-wrap: anywhere; }

/* ---- Footer -------------------------------------------------------------------------------- */

.footer { border-top: 1px solid var(--line); margin-top: 120px; }
.footer .wrap {
  padding-block: 32px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  font-size: 14px; color: var(--faint);
}