:root {
  --bg: #f7f8fa;
  --bg-alt: #eef1f5;
  --surface: #ffffff;
  --text: #16191f;
  --muted: #586070;
  --border: #dde2ea;
  --accent: #e8590c;
  --accent-soft: #fff0e6;
  --ok: #2b8a3e;
  --err: #c92a2a;
  --code-bg: #eef1f5;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 16px rgba(16, 24, 40, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-alt: #151922;
    --surface: #1a1f29;
    --text: #e8ebf0;
    --muted: #9aa3b2;
    --border: #2a3140;
    --accent: #ff8a3d;
    --accent-soft: #2b1d14;
    --ok: #51cf66;
    --err: #ff6b6b;
    --code-bg: #222836;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code {
  font-family: "JetBrains Mono", ui-monospace, Menlo, monospace;
  font-size: .86em;
  background: var(--code-bg);
  padding: .1em .4em;
  border-radius: 5px;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: -.01em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 9px; background: var(--accent); color: #fff; }
.nav { display: flex; gap: 20px; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { color: var(--muted); font-size: .92rem; font-weight: 500; white-space: nowrap; }
.nav a:hover { color: var(--text); text-decoration: none; }
.nav .nav-gh { color: var(--accent); }
@media (max-width: 760px) { .nav a:not(.nav-gh) { display: none; } }

/* Hero */
.hero { padding: 56px 0 64px; }
.hero-grid { display: grid; gap: 40px; align-items: center; }
@media (min-width: 860px) { .hero-grid { grid-template-columns: 1.3fr 1fr; } }
.eyebrow { color: var(--accent); font-weight: 600; font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 60ch; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 600;
  border: 1px solid var(--border); color: var(--text); background: var(--surface);
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.hero-phone { justify-self: center; width: min(240px, 60vw); }
@media (min-width: 860px) { .hero-phone { justify-self: end; } }
.hero-phone img { width: 100%; height: auto; }
.hero-phone img, .shot img {
  border-radius: 28px; border: 8px solid #1b1e24; box-shadow: var(--shadow); background: #000;
}

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section-lead { color: var(--muted); font-size: 1.08rem; max-width: 70ch; margin-bottom: 36px; }
.sub-h { margin-top: 48px; }
.note { color: var(--muted); font-size: .94rem; margin-top: 16px; }

/* Cards */
.cards { display: grid; gap: 20px; }
@media (min-width: 760px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 24px; box-shadow: var(--shadow); }
.card p { color: var(--muted); margin: 0; }
.card-icon { width: 42px; height: 42px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; margin-bottom: 14px; }
.card-icon svg { width: 22px; height: 22px; }

/* Flow diagram */
.flow { display: flex; flex-direction: column; align-items: stretch; gap: 6px; margin-bottom: 48px; }
@media (min-width: 900px) { .flow { flex-direction: row; align-items: center; } }
.node {
  flex: 1; background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px; text-align: center; box-shadow: var(--shadow);
}
.node-title { display: block; font-weight: 700; }
.node-sub { display: block; color: var(--muted); font-size: .85rem; }
.link { display: flex; flex-direction: column; align-items: center; font-size: .78rem; color: var(--muted); padding: 4px 6px; min-width: 120px; }
.link .arrow { font-size: 1.4rem; color: var(--accent); line-height: 1; transform: rotate(90deg); }
@media (min-width: 900px) { .link .arrow { transform: none; } }
.link-label { font-weight: 600; color: var(--text); }

/* Steps */
.steps { display: grid; gap: 20px; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(2, 1fr); } }
.step { display: flex; gap: 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.step p { color: var(--muted); margin: 0; }
.step-n { flex: none; width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; display: grid; place-items: center; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); margin-bottom: 20px; }
table { width: 100%; border-collapse: collapse; font-size: .94rem; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: var(--bg-alt); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
.uuid { font-size: .78em; word-break: break-all; }

/* Gallery */
.gallery { display: flex; flex-wrap: wrap; gap: 28px; justify-content: center; }
.gallery .shot { flex: 0 1 220px; min-width: 0; }
.shot { margin: 0; }
.shot figcaption { margin-top: 14px; font-size: .92rem; color: var(--muted); }
.shot figcaption strong { display: block; color: var(--text); }

/* Video */
.video-frame {
  max-width: 820px; margin: 0 auto; border-radius: 16px; overflow: hidden;
  background: #0b0d11; border: 1px solid var(--border); box-shadow: var(--shadow);
}
.video-frame video { display: block; width: 100%; height: auto; }
.video-caption { max-width: 820px; margin: 14px auto 40px; color: var(--muted); font-size: .95rem; }
.video-caption strong { color: var(--text); margin-right: 6px; }

/* Gesture screenshots */
.gesture-gallery { margin-top: 36px; flex-wrap: nowrap; gap: 20px; }
.gesture-gallery img { width: 100%; height: auto; }
@media (max-width: 560px) {
  .gesture-gallery { gap: 10px; }
  .gesture-gallery img { border-width: 4px; border-radius: 14px; }
  .gesture-gallery figcaption { font-size: .8rem; }
}
.shot figcaption code { font-size: .9em; }

/* Hardware photos */
.photo-grid { display: flex; flex-wrap: wrap; gap: 20px; justify-content: center; }
.photo-grid .photo { flex: 0 1 240px; min-width: 0; }
.photo { margin: 0; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); }
.photo a { display: block; }
.photo img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; background: var(--bg-alt); transition: transform .25s ease; }
.photo a:hover img { transform: scale(1.03); }
.photo figcaption, .demo figcaption { padding: 12px 16px 16px; font-size: .92rem; color: var(--muted); }
.photo figcaption strong, .demo figcaption strong { display: block; color: var(--text); }

/* Demos */
.demo-grid { display: flex; flex-wrap: wrap; gap: 24px; justify-content: center; align-items: stretch; }
.demo-grid .demo { flex: 0 1 300px; min-width: 0; }
.demo { margin: 0; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); }
.demo video, .demo img { display: block; width: 100%; height: auto; aspect-ratio: 9 / 16; object-fit: contain; background: #0b0d11; }

/* Protocol */
.two-col { display: grid; gap: 28px; }
@media (min-width: 900px) { .two-col { grid-template-columns: 1fr 1fr; } }
.states { display: flex; flex-wrap: wrap; gap: 10px; }
.state { background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 6px 14px; font-size: .9rem; }
.state b { font-family: "JetBrains Mono", monospace; color: var(--muted); margin-right: 4px; }
.state-ok { border-color: var(--ok); }
.state-ok b { color: var(--ok); }
.state-err { border-color: var(--err); }
.state-err b { color: var(--err); }
.tags { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.tags li { background: var(--accent-soft); color: var(--text); border-radius: 8px; padding: 5px 12px; font-size: .88rem; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--muted); font-size: .9rem; }
.site-footer p { margin: 0 0 4px; }

/* Phones: app screenshots two per row */
@media (max-width: 560px) {
  .gallery { gap: 16px; }
  .gallery .shot { flex-basis: calc(50% - 8px); }
  .gallery .shot img { border-width: 5px; border-radius: 18px; }
}