/* sofabox.app — SofaBox website (by OTB Vision) */
:root {
  --bg: #07090f;
  --panel: #10141f;
  --panel-2: #151a28;
  --line: rgba(255, 255, 255, 0.08);
  --text: #f3f5fa;
  --muted: #a3abc0;
  --accent: #4f8cff;
  --accent-2: #b45cff;
  --accent-3: #14b8c4;
  --radius: 18px;
  --max: 1160px;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI Variable Text", "Segoe UI", Roboto, system-ui, -apple-system, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; display: block; }
.wrap { width: min(var(--max), 100% - 32px); margin: 0 auto; }

/* ---------- background glow */
.glow {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(900px 600px at 10% -10%, rgba(79, 140, 255, .28), transparent 70%),
    radial-gradient(800px 500px at 100% 0%, rgba(180, 92, 255, .18), transparent 70%),
    radial-gradient(700px 500px at 50% 110%, rgba(20, 184, 196, .12), transparent 70%);
}

/* ---------- nav */
.nav { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); background: rgba(7, 9, 15, .72); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; text-decoration: none; letter-spacing: -.01em; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand .box { background: linear-gradient(100deg, #4f8cff, #b45cff 60%, #14b8c4); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand small { font-weight: 500; color: var(--muted); font-size: 13px; margin-left: 2px; }
.nav-links { display: flex; gap: 6px; margin-left: auto; align-items: center; }
.nav-links a { text-decoration: none; color: var(--muted); padding: 8px 12px; border-radius: 10px; font-size: 15px; font-weight: 500; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: rgba(255, 255, 255, .06); }
.nav-links .btn { margin-left: 8px; }

/* ---------- buttons */
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 13px 22px; border-radius: 12px; font-weight: 600; font-size: 16px; text-decoration: none; border: 1px solid var(--line); background: rgba(255, 255, 255, .06); color: var(--text); transition: transform .15s, background .15s, box-shadow .15s; }
.btn:hover { background: rgba(255, 255, 255, .1); transform: translateY(-1px); }
.btn.primary { background: var(--accent); border-color: transparent; box-shadow: 0 10px 30px rgba(79, 140, 255, .35); }
.btn.primary:hover { background: #6a9dff; }
.btn.small { padding: 9px 16px; font-size: 15px; }
.btn svg { width: 20px; height: 20px; flex: none; }

/* ---------- hero */
.hero { padding: 90px 0 40px; text-align: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 99px; background: rgba(79, 140, 255, .12); color: #9dbcff; font-size: 14px; font-weight: 600; letter-spacing: .02em; }
.hero h1 { font-size: clamp(42px, 7vw, 80px); line-height: 1.02; letter-spacing: -.035em; margin: 22px auto 18px; max-width: 900px; }
.grad { background: linear-gradient(100deg, #fff 10%, #9dbcff 45%, #c79bff 75%, #7fe3ea); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { font-size: clamp(18px, 2.2vw, 21px); color: var(--muted); max-width: 680px; margin: 0 auto 32px; }
.cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.platforms { margin-top: 18px; color: var(--muted); font-size: 14px; }

/* ---------- demo frame */
.demo { margin: 60px auto 0; max-width: 1080px; }
.frame { position: relative; border-radius: 22px; padding: 10px; background: linear-gradient(140deg, rgba(79, 140, 255, .5), rgba(180, 92, 255, .35), rgba(20, 184, 196, .35)); box-shadow: 0 40px 120px rgba(0, 0, 0, .6), 0 0 80px rgba(79, 140, 255, .2); }
.frame iframe { display: block; width: 100%; aspect-ratio: 16 / 9; border: 0; border-radius: 14px; background: #07090f; }
.demo-note { text-align: center; color: var(--muted); font-size: 14px; margin-top: 14px; }
.demo-note a { color: #9dbcff; }
kbd { font-family: inherit; font-size: 12px; padding: 2px 7px; border-radius: 6px; background: rgba(255, 255, 255, .1); border: 1px solid var(--line); }

/* ---------- sections */
section { padding: 90px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 50px; }
.section-head h2 { font-size: clamp(32px, 4.5vw, 48px); letter-spacing: -.025em; line-height: 1.1; margin: 10px 0 14px; }
.section-head p { color: var(--muted); font-size: 18px; margin: 0; }
.kicker { color: var(--accent); font-weight: 700; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: linear-gradient(180deg, var(--panel-2), var(--panel)); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.card h3 { margin: 16px 0 8px; font-size: 20px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--muted); font-size: 16px; }
.icon { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; background: rgba(79, 140, 255, .14); color: #9dbcff; }
.icon svg { width: 24px; height: 24px; }
.icon.purple { background: rgba(180, 92, 255, .14); color: #d1a8ff; }
.icon.teal { background: rgba(20, 184, 196, .14); color: #7fe3ea; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; counter-reset: step; }
.step { position: relative; padding: 28px; border-radius: var(--radius); border: 1px solid var(--line); background: rgba(255, 255, 255, .02); }
.step::before { counter-increment: step; content: counter(step); display: grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; background: var(--accent); font-weight: 700; margin-bottom: 14px; }
.step h3 { margin: 0 0 6px; font-size: 19px; }
.step p { margin: 0; color: var(--muted); font-size: 16px; }

.chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 34px; }
.chip { padding: 8px 14px; border-radius: 99px; background: rgba(255, 255, 255, .05); border: 1px solid var(--line); color: var(--muted); font-size: 14px; font-weight: 500; }

/* ---------- download */
.downloads { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; max-width: 900px; margin: 0 auto; }
.dl { padding: 34px; border-radius: 22px; border: 1px solid var(--line); background: linear-gradient(180deg, var(--panel-2), var(--panel)); }
.dl h3 { display: flex; align-items: center; gap: 12px; margin: 0 0 6px; font-size: 24px; }
.dl h3 svg { width: 30px; height: 30px; }
.dl .req { color: var(--muted); font-size: 15px; margin: 0 0 22px; }
.dl .btns { display: flex; gap: 10px; flex-wrap: wrap; }
.dl .fine { color: var(--muted); font-size: 13px; margin: 18px 0 0; }
.soon { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; padding: 3px 9px; border-radius: 99px; background: rgba(180, 92, 255, .16); color: #d1a8ff; margin-left: 6px; vertical-align: middle; }

/* ---------- FAQ */
.faq { max-width: 820px; margin: 0 auto; }
details { border-bottom: 1px solid var(--line); padding: 20px 4px; }
summary { cursor: pointer; font-weight: 600; font-size: 18px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
summary::after { content: "+"; color: var(--accent); font-size: 24px; line-height: 1; }
details[open] summary::after { content: "–"; }
details p, details li { color: var(--muted); }
details p { margin: 12px 0 0; }

/* ---------- long text pages */
.page { padding: 70px 0 90px; }
.prose { max-width: 780px; margin: 0 auto; }
.prose h1 { font-size: clamp(36px, 5vw, 52px); letter-spacing: -.03em; line-height: 1.1; margin: 0 0 8px; }
.prose .updated { color: var(--muted); margin: 0 0 36px; }
.prose h2 { font-size: 26px; letter-spacing: -.015em; margin: 44px 0 12px; }
.prose h3 { font-size: 19px; margin: 28px 0 8px; }
.prose p, .prose li { color: #c9cfdd; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose a { color: #9dbcff; }
.prose code { font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: .9em; background: rgba(255, 255, 255, .07); padding: 2px 6px; border-radius: 6px; }
.callout { padding: 18px 20px; border-radius: 14px; background: rgba(79, 140, 255, .1); border: 1px solid rgba(79, 140, 255, .25); color: #c9d8ff; margin: 20px 0; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 30px; }
.toc a { text-decoration: none; font-size: 14px; padding: 7px 13px; border-radius: 99px; background: rgba(255, 255, 255, .05); border: 1px solid var(--line); color: var(--muted); }
.toc a:hover { color: var(--text); }

/* ---------- footer */
footer { border-top: 1px solid var(--line); padding: 40px 0 50px; color: var(--muted); font-size: 15px; }
footer .wrap { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
footer nav { display: flex; gap: 18px; margin-left: auto; flex-wrap: wrap; }
footer a { text-decoration: none; }
footer a:hover { color: var(--text); }

/* ---------- small screens */
@media (max-width: 900px) {
  .grid, .steps { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav-links a:not(.btn) { display: none; }
  .hero { padding-top: 60px; }
  .grid, .steps, .downloads { grid-template-columns: 1fr; }
  section { padding: 64px 0; }
  .frame { padding: 6px; border-radius: 16px; }
  .frame iframe { border-radius: 11px; aspect-ratio: 4 / 3; }
  footer nav { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn { transition: none; } }
.nav-links a.btn.primary { color: #fff; }
.nav-links a.btn.primary:hover { background: #6a9dff; }