/* ReFlight landing page. Same visual language as the app: black-and-white
   surfaces, one brand gradient (the logo), Space Grotesk headings, Inter body. */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f6f7;
  --fg: #0a0a0a;
  --muted: #5f6470;
  --faint: #9aa0ab;
  --line: #e8e8ea;
  --card: #ffffff;
  --accent: #0a0a0a;
  --on-accent: #ffffff;
  --live: #16a34a;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 24px 60px rgba(0,0,0,.08);
  --display: "Space Grotesk", system-ui, sans-serif;
  --body: "Inter", system-ui, -apple-system, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a; --bg-soft: #121214; --fg: #f5f5f6; --muted: #a3a7b0; --faint: #6b6f78;
    --line: rgba(255,255,255,.1); --card: #151517; --accent: #f5f5f6; --on-accent: #0a0a0a;
    --live: #22c55e; --shadow: 0 1px 2px rgba(0,0,0,.5), 0 24px 60px rgba(0,0,0,.45);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
/* Anchor targets stop below the sticky header instead of underneath it. */
[id] { scroll-margin-top: 88px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--body); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--fg); outline-offset: 3px; border-radius: 6px; }

.wrap { max-width: 1120px; margin: 0 auto; padding-left: 20px; padding-right: 20px; }
.narrow { max-width: 760px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; background: var(--card); padding: 8px 12px; border-radius: 8px; z-index: 20; }

h1, h2, h3 { font-family: var(--display); font-weight: 600; letter-spacing: -.025em; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(40px, 6.8vw, 70px); line-height: 1.02; letter-spacing: -.04em; }
h2 { font-size: clamp(26px, 3.6vw, 36px); line-height: 1.15; }
h3 { font-size: 18px; line-height: 1.3; letter-spacing: -.01em; }
p { margin: 0; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; font-weight: 600; font-size: 15px; padding: 12px 20px; border-radius: 11px; background: var(--accent); color: var(--on-accent); border: 1px solid var(--accent); transition: opacity .15s; }
.btn:hover { opacity: .86; }
.btn-ghost { background: transparent; color: var(--fg); border-color: var(--line); }
.btn-ghost:hover { opacity: 1; border-color: var(--faint); }
.btn-small { font-size: 14px; padding: 8px 14px; border-radius: 9px; }

/* header */
.site-header { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-family: var(--display); font-weight: 600; font-size: 19px; letter-spacing: -.02em; }
.brand img { border-radius: 17.6%; }
.brand b { font-weight: inherit; }
nav { display: flex; align-items: center; gap: 22px; }
nav a:not(.btn) { text-decoration: none; color: var(--muted); font-size: 15px; }
nav a:not(.btn):hover { color: var(--fg); }

/* hero */
.hero { padding-block: 64px 80px; }
.hero-grid { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: center; }
.hero-copy { min-width: 0; }
.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 18px; }
.lead { font-size: 19px; line-height: 1.6; color: var(--muted); margin-top: 22px; max-width: 34em; }
.lead strong { color: var(--fg); font-weight: 600; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.fine { font-size: 14px; color: var(--faint); margin-top: 16px; }

/* product mock (decorative) */
.mock { background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; min-width: 0; font-size: 13px; }
.mock-bar { display: flex; gap: 6px; padding: 12px 14px; border-bottom: 1px solid var(--line); }
.mock-bar span { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.mock-body { display: grid; grid-template-columns: 132px 1fr; }
.mock-side { border-right: 1px solid var(--line); padding: 14px 10px; }
.mock-label { font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--faint); font-weight: 600; margin: 0 6px 8px; }
.mock-row { display: flex; align-items: center; gap: 7px; padding: 6px 8px; border-radius: 7px; font-weight: 600; font-variant-numeric: tabular-nums; }
.mock-row em { margin-left: auto; font-style: normal; font-weight: 500; font-size: 10.5px; color: var(--faint); }
.mock-row.on { background: var(--bg-soft); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); opacity: .5; flex: none; }
.dot.live { background: var(--live); opacity: 1; }
.dot.edit { background: var(--accent); opacity: 1; }
.mock-main { padding: 14px; display: grid; gap: 10px; min-width: 0; }
.mock-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.mock-head b { font-family: var(--display); font-size: 16px; }
.mock-tag { font-size: 11px; border: 1px solid var(--line); border-radius: 6px; padding: 1px 7px; color: var(--muted); }
.mock-save { margin-left: auto; background: var(--accent); color: var(--on-accent); border-radius: 7px; padding: 4px 10px; font-weight: 600; font-size: 11.5px; }
.mock-card { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; position: relative; }
.mock-card::before { content: ""; position: absolute; left: 0; top: 10px; bottom: 10px; width: 2.5px; border-radius: 3px; background: var(--accent); }
.mock-loc { font-weight: 600; font-size: 11.5px; margin-bottom: 4px; }
.mock-card p { color: var(--muted); line-height: 1.5; }
.mock-count { text-align: right; font-size: 10.5px; color: var(--faint); margin-top: 4px; font-variant-numeric: tabular-nums; }

/* sections */
.section { padding-block: 88px; }
.section-soft { background: var(--bg-soft); }
.section h2 + .sub { color: var(--muted); margin-top: 10px; }
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px 36px; margin-top: 44px; }
.features p, .steps p, .split p { color: var(--muted); margin-top: 8px; }

.split { display: grid; grid-template-columns: 1.2fr 1fr; gap: 56px; align-items: center; }
.split p { max-width: 36em; margin-top: 12px; }
.h2-follow { margin-top: 40px; }
.versions { list-style: none; margin: 0; padding: 10px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
.versions li { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 9px; font-weight: 600; font-variant-numeric: tabular-nums; }
.versions li:first-child { background: var(--bg-soft); }
.versions li em { margin-left: auto; font-style: normal; font-weight: 500; font-size: 13px; color: var(--muted); }
.versions li.muted { opacity: .55; }

.steps { list-style: none; counter-reset: step; padding: 0; margin: 44px 0 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 36px; }
.steps li { counter-increment: step; }
.steps li::before { content: counter(step); display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--accent); color: var(--on-accent); font-family: var(--display); font-weight: 700; margin-bottom: 16px; }

.roadmap { list-style: none; padding: 0; margin: 28px 0 0; display: flex; flex-wrap: wrap; gap: 10px; }
.roadmap li { border: 1px dashed var(--faint); border-radius: 999px; padding: 8px 16px; color: var(--muted); font-size: 15px; }

details { border-bottom: 1px solid var(--line); padding: 18px 0; }
details:first-of-type { margin-top: 28px; border-top: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--faint); font-weight: 400; font-size: 22px; line-height: 1; }
details[open] summary::after { content: "−"; }
details p { color: var(--muted); margin-top: 10px; max-width: 42em; }

.final { text-align: center; }
.final-inner { display: grid; justify-items: center; gap: 26px; }

.site-footer { border-top: 1px solid var(--line); padding-block: 28px; }
.footer-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer .brand { font-size: 16px; }
.site-footer p { color: var(--faint); font-size: 13px; }

/* early-access signup (Kit) */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.signup { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; max-width: 480px; }
.signup input { flex: 1 1 220px; min-width: 0; font: inherit; font-size: 15px; color: var(--fg); background: var(--card); border: 1px solid var(--line); border-radius: 11px; padding: 12px 14px; }
.signup input:focus { outline: none; border-color: var(--fg); }
.signup .btn { flex: none; cursor: pointer; font-family: inherit; }
.signup .btn:disabled { opacity: .6; cursor: default; }
.signup-msg { flex-basis: 100%; margin: 0; font-size: 14px; color: var(--muted); }
.signup-msg:empty { display: none; }
.signup.is-error .signup-msg { color: #dc2626; }
.signup.is-done .signup-msg { color: var(--live); }
.signup-center { margin: 0 auto; justify-content: center; width: 100%; }
.fine a { color: var(--muted); }

/* responsive */
@media (max-width: 900px) {
  .hero { padding-block: 40px 56px; }
  .hero-grid, .split { grid-template-columns: 1fr; gap: 40px; }
  .features, .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  nav a:not(.btn) { display: none; }
  .features, .steps { grid-template-columns: 1fr; gap: 28px; }
  .section { padding-block: 64px; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-side { display: none; }
  .lead { font-size: 17px; }
}