/* rfranger.app: matches the app's dark look. System fonts, no external requests. */
:root {
  color-scheme: dark;
  --bg: #08090b;
  --bg-2: #0d1014;
  --panel: #12161b;
  --panel-2: #181d24;
  --line: #232a33;
  --line-2: #2e3641;
  --text: #e9eef3;
  --text-2: #b3bdc8;
  --muted: #7d8894;
  --accent: #00d8ff;
  --ok: #1df08d;
  --warn: #ff8a1c;
  --bad: #ff2e55;
  --radius: 12px;
  --font: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, Consolas, monospace;
  --page: min(1120px, 100% - 32px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
img { max-width: 100%; height: auto; display: block; }

/* Header */
.top {
  position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px max(16px, (100% - 1120px) / 2); background: #08090bdd; backdrop-filter: blur(10px); border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-size: 19px; letter-spacing: -0.01em; }
.brand b { font-weight: 800; }
.top nav { display: flex; gap: 22px; }
.top nav a { color: var(--text-2); text-decoration: none; font-size: 15px; font-weight: 500; }
.top nav a:hover { color: var(--text); }

/* Hero */
main > section { width: var(--page); margin: 0 auto; }
.hero { padding: 72px 0 24px; text-align: center; scroll-margin-top: 60px; }
.eyebrow { margin: 0 0 14px; font-family: var(--mono); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); }
h1 { margin: 0; font-size: clamp(40px, 7vw, 72px); line-height: 1.02; letter-spacing: -0.035em; font-weight: 800; }
.lede { max-width: 640px; margin: 22px auto 0; font-size: 19px; color: var(--text-2); }

.downloads { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 34px; }
.btn {
  display: inline-flex; align-items: center; gap: 12px; padding: 12px 22px 12px 18px; border-radius: 10px; border: 1px solid var(--line-2);
  background: var(--panel-2); color: var(--text); text-decoration: none; text-align: left; font: inherit; cursor: pointer;
  transition: transform 0.12s, background 0.12s, border-color 0.12s;
}
.btn:hover { transform: translateY(-1px); border-color: var(--muted); }
.btn svg { width: 24px; height: 24px; flex: none; }
.btn span { display: flex; flex-direction: column; line-height: 1.25; }
.btn b { font-size: 16px; }
.btn small { font-size: 12.5px; color: var(--muted); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #001419; }
.btn--primary small { color: #003a47; }
.btn--primary:hover { background: #4fe6ff; border-color: #4fe6ff; }
/* The visitor's own platform leads; the other is offered, quieter. */
.downloads[data-ready] .btn[data-os]:not([data-mine]) { background: var(--panel-2); border-color: var(--line-2); color: var(--text); }
.downloads[data-ready] .btn[data-os]:not([data-mine]) small { color: var(--muted); }
.downloads[data-ready] .btn[data-mine] { order: -1; }
.release { margin: 14px 0 0; font-size: 14px; color: var(--muted); }
.release a { color: var(--text-2); }

.shot { margin: 0; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line-2); background: var(--bg-2); }
.shot--hero { margin-top: 48px; box-shadow: 0 30px 80px #00d8ff12, 0 12px 40px #000c; }

/* About */
h2 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 38px); letter-spacing: -0.02em; line-height: 1.15; }
.about, .feedback { padding: 72px 0 0; scroll-margin-top: 40px; }
.about__intro { max-width: 720px; margin: 0; font-size: 18px; color: var(--text-2); }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 36px; }
.feature h3 { margin: 18px 0 6px; font-size: 19px; }
.feature p { margin: 0; color: var(--text-2); font-size: 15.5px; }
.feature .shot img { aspect-ratio: 16 / 10; object-fit: cover; object-position: left top; }

.hardware { margin-top: 36px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.hardware summary { padding: 16px 20px; cursor: pointer; font-weight: 700; list-style: none; display: flex; align-items: center; gap: 10px; }
.hardware summary::-webkit-details-marker { display: none; }
.hardware summary::before { content: '›'; display: inline-block; color: var(--accent); font-size: 20px; line-height: 1; transition: transform 0.15s; }
.hardware[open] summary::before { transform: rotate(90deg); }
.hardware ul { margin: 0; padding: 0 20px 18px 44px; color: var(--text-2); display: grid; gap: 6px; }
.muted { color: var(--muted); }

/* Feedback */
.feedback > p { max-width: 720px; margin: 0 0 10px; color: var(--text-2); }
.notice { font-size: 14px; color: var(--muted) !important; }
.form { display: grid; gap: 16px; max-width: 760px; margin-top: 24px; padding: 24px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.form__row { display: grid; grid-template-columns: 1.3fr 1fr 0.8fr; gap: 14px; }
.form label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; color: var(--text-2); }
.form em { font-style: normal; font-weight: 400; color: var(--muted); }
.form input, .form select, .form textarea {
  width: 100%; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--bg-2); color: var(--text);
  font: 15px/1.4 var(--font);
}
.form textarea { resize: vertical; min-height: 140px; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px #00d8ff26; }
.form__foot { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.btn--send { padding: 11px 22px; font-weight: 700; }
.btn--send[disabled] { opacity: 0.6; cursor: wait; transform: none; }
.form__status { margin: 0; font-size: 15px; }
.form__status[data-tone='ok'] { color: var(--ok); }
.form__status[data-tone='bad'] { color: var(--bad); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; width: var(--page); margin: 80px auto 0; padding: 24px 0 40px; border-top: 1px solid var(--line); font-size: 13px; color: var(--muted); }

@media (max-width: 860px) {
  .features { grid-template-columns: 1fr; }
  .form__row { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .top nav { gap: 14px; }
  .hero { padding-top: 44px; }
  .lede { font-size: 17px; }
  .btn { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}

/* Get updates */
.updates { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px 32px; margin-top: 72px !important; padding: 28px; border-radius: var(--radius); border: 1px solid var(--line-2); background: linear-gradient(135deg, #00d8ff12, var(--panel) 60%); }
.updates h2 { margin-bottom: 4px; font-size: 26px; }
.updates p { margin: 0; color: var(--text-2); }
.subscribe { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; flex: 1 1 360px; max-width: 520px; }
.subscribe input[type='email'] { flex: 1 1 220px; min-width: 0; padding: 11px 13px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--bg-2); color: var(--text); font: 15px var(--font); }
.subscribe input[type='email']:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px #00d8ff26; }
.subscribe .form__status { flex-basis: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.foot__gh { display: inline-flex; align-items: center; gap: 6px; color: var(--text-2); text-decoration: none; }
.foot__gh:hover { color: var(--text); }