:root {
  --bg: #0d1117;
  --bg-alt: #111722;
  --surface: #161d2a;
  --surface-2: #1c2433;
  --border: #263044;
  --text: #e6ebf3;
  --muted: #95a0b4;
  --accent: #22B07D;
  --accent-2: #4C8DF6;

  /* message family colours, as in the app */
  --m1: #4C8DF6;
  --m2: #22B07D;
  --system: #9A8C7A;
  --sysex: #E0A030;
  --flex: #B46FE0;
  --stream: #E05A7A;
  --utility: #7A8699;

  /* RAW view field colours, as in the app */
  --k-mt: #7A8699;
  --k-group: #9A8C7A;
  --k-status: #E0A030;
  --k-channel: #4C8DF6;
  --k-address: #B46FE0;
  --k-value: #22B07D;
  --k-flags: #E05A7A;
  --k-payload: #3BB0C4;
  --warn: #E05A5A;

  --radius: 12px;
  --mono: "JetBrains Mono", "Cascadia Mono", Consolas, Menlo, monospace;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; }
code { font-family: var(--mono); font-size: .88em; background: var(--surface-2); padding: .1em .4em; border-radius: 5px; }
h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; letter-spacing: -.02em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); font-weight: 750; }
h3 { font-size: 1.08rem; font-weight: 650; letter-spacing: -.01em; }

.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .wrap { padding: 0 16px; } }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; text-decoration: none; letter-spacing: -.01em; }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .93rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); }
@media (max-width: 720px) { .nav-links { display: none; } .nav-inner .btn { margin-left: auto; } }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 20px; border-radius: 10px;
  background: var(--accent); color: #04140d;
  font-weight: 650; font-size: .97rem; text-decoration: none;
  border: 1px solid transparent;
  transition: transform .15s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { background: #2bc48d; transform: translateY(-1px); }
.btn:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface); border-color: #36435d; }
.btn-small { padding: 7px 14px; font-size: .88rem; border-radius: 8px; }
.btn-lg { padding: 15px 24px; font-size: 1.02rem; }
.btn-icon { width: 18px; height: 18px; fill: currentColor; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 72px 0 56px;
  background:
    radial-gradient(800px 420px at 85% 10%, rgba(76,141,246,.16), transparent 60%),
    radial-gradient(700px 380px at 10% 0%, rgba(34,176,125,.13), transparent 60%);
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr); gap: 48px; align-items: center; }
@media (max-width: 980px) { .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 40px; } .hero { padding-top: 48px; } }

.eyebrow { font-family: var(--mono); font-size: .8rem; color: var(--accent); text-transform: uppercase; letter-spacing: .12em; margin: 0 0 16px; }
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 800; letter-spacing: -.035em; }
.grad { background: linear-gradient(90deg, var(--m2), var(--m1)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 1.12rem; color: var(--muted); max-width: 34em; margin: 0 0 28px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }
.fineprint { color: var(--muted); font-size: .85rem; margin: 18px 0 0; }

/* ---------- app window mock ---------- */
.window {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 30px 80px -20px rgba(0,0,0,.6), 0 0 0 1px rgba(255,255,255,.02) inset;
  overflow: hidden;
  min-width: 0;
}
.window-bar { display: flex; align-items: center; gap: 7px; padding: 10px 14px; background: var(--surface-2); border-bottom: 1px solid var(--border); }
.window-icon { display: block; margin: -2px 0; }
.window-title { font-size: .78rem; color: var(--muted); font-weight: 600; }
/* Windows-style minimise / maximise / close glyphs */
.window-controls { margin-left: auto; display: flex; gap: 18px; padding-right: 4px; }
.window-controls span { width: 10px; height: 10px; position: relative; opacity: .55; }
.window-controls span:nth-child(1)::after { content: ""; position: absolute; left: 0; right: 0; top: 50%; border-top: 1px solid var(--text); }
.window-controls span:nth-child(2) { border: 1px solid var(--text); }
.window-controls span:nth-child(3)::before, .window-controls span:nth-child(3)::after { content: ""; position: absolute; left: -2px; right: -2px; top: 50%; border-top: 1px solid var(--text); transform: rotate(45deg); }
.window-controls span:nth-child(3)::after { transform: rotate(-45deg); }
.window-toolbar { display: flex; align-items: center; gap: 6px; padding: 9px 12px; border-bottom: 1px solid var(--border); overflow: hidden; white-space: nowrap; }
.tb { font-size: .72rem; padding: 3px 9px; border-radius: 5px; background: var(--surface-2); color: var(--muted); font-weight: 600; }
.tb-accent { background: var(--accent); color: #04140d; }
.tb-on { background: #2a3448; color: var(--text); }
.tb-sep { width: 1px; height: 16px; background: var(--border); margin: 0 3px; }
.chip { font-size: .7rem; padding: 2px 8px; border-radius: 5px; border: 1px solid; font-weight: 600; }
.c-m1 { color: var(--m1); border-color: color-mix(in srgb, var(--m1) 45%, transparent); }
.c-m2 { color: var(--m2); border-color: color-mix(in srgb, var(--m2) 45%, transparent); }
.c-flex { color: var(--flex); border-color: color-mix(in srgb, var(--flex) 45%, transparent); }
.c-stream { color: var(--stream); border-color: color-mix(in srgb, var(--stream) 45%, transparent); }

.monitor { font-size: .74rem; }
#monitor-body { height: 300px; overflow: hidden; display: flex; flex-direction: column; justify-content: flex-end; }
.mrow {
  display: grid;
  grid-template-columns: 68px 74px 28px 24px 62px minmax(0, 1fr) 128px;
  gap: 8px; align-items: center;
  padding: 0 12px; height: 30px;
  border-bottom: 1px solid rgba(38,48,68,.6);
  white-space: nowrap;
}
.mrow > span { overflow: hidden; text-overflow: ellipsis; }
.mhead { color: var(--muted); font-weight: 600; font-size: .68rem; text-transform: uppercase; letter-spacing: .04em; height: 28px; background: var(--surface-2); }
.mono { font-family: var(--mono); font-size: .7rem; }
.mono.dim { color: var(--muted); }
.type { font-weight: 600; font-size: .68rem; padding: 1px 6px; border-radius: 4px; justify-self: start; }
.mrow.new { animation: rowin .35s ease-out; }
@keyframes rowin { from { background: rgba(76,141,246,.14); transform: translateY(6px); opacity: 0; } to { background: transparent; transform: none; opacity: 1; } }
@media (max-width: 560px) {
  .mrow { grid-template-columns: 58px 0 24px 22px 56px minmax(0, 1fr); gap: 6px; }
  .mrow > :nth-child(2) { visibility: hidden; }
  .hide-sm, .mrow > :nth-child(7) { display: none; }
}

/* ---------- families strip ---------- */
.families { padding: 36px 24px 8px; }
.families-title { text-align: center; color: var(--muted); font-size: .82rem; text-transform: uppercase; letter-spacing: .12em; margin: 0 0 18px; }
.family-list { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 12px; }
.family-list li { display: inline-flex; align-items: center; gap: 8px; padding: 7px 13px; border: 1px solid var(--border); border-radius: 999px; font-size: .86rem; background: var(--bg-alt); }
.sw { display: inline-block; width: 10px; height: 10px; border-radius: 3px; background: var(--c); flex: none; }
.sw-reserved { background: transparent; border: 1px dashed rgba(122,134,153,.6); }

/* ---------- sections ---------- */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-lead { color: var(--muted); font-size: 1.08rem; max-width: 42em; margin: 0 0 40px; }
@media (max-width: 600px) { .section { padding: 64px 0; } }

.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 920px) { .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) { .grid { grid-template-columns: minmax(0, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: border-color .2s ease, transform .2s ease; }
.card:hover { border-color: #36435d; transform: translateY(-2px); }
.card p { color: var(--muted); margin: 0; font-size: .95rem; }
.icon { width: 40px; height: 40px; border-radius: 10px; display: grid; place-items: center; margin-bottom: 16px; background: linear-gradient(135deg, rgba(34,176,125,.18), rgba(76,141,246,.18)); border: 1px solid var(--border); }
.icon svg { width: 20px; height: 20px; fill: none; stroke: var(--text); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- RAW demo ---------- */
.raw-demo { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 20px; }
@media (max-width: 860px) { .raw-demo { grid-template-columns: minmax(0, 1fr); } }
.raw-picker { display: flex; flex-direction: column; gap: 6px; }
@media (max-width: 860px) { .raw-picker { flex-direction: row; overflow-x: auto; padding-bottom: 4px; } }
.pick {
  text-align: left; cursor: pointer; font: inherit;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 11px 14px; display: flex; flex-direction: column; gap: 2px;
  flex: none;
}
.pick small { color: var(--muted); font-size: .78rem; }
.pick:hover { border-color: #36435d; }
.pick[aria-selected="true"] { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, var(--surface)); }
.pick:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }

.raw-panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; min-width: 0; }
.raw-hex { display: flex; flex-wrap: wrap; gap: 14px 22px; font-family: var(--mono); font-size: clamp(1.1rem, 2.6vw, 1.6rem); font-weight: 600; margin-bottom: 20px; }
.word { display: flex; gap: 3px; align-items: center; }
.word-label { font-size: .7rem; color: var(--muted); font-weight: 500; margin-right: 6px; }
.chunk {
  --c: var(--k-mt);
  cursor: pointer; font: inherit; color: var(--text);
  padding: 4px 6px; border-radius: 5px;
  background: color-mix(in srgb, var(--c) 28%, transparent);
  border: 1px solid color-mix(in srgb, var(--c) 62%, transparent);
  transition: border-width .1s, transform .1s;
}
.chunk:hover, .chunk:focus-visible, .chunk.active { outline: 2px solid var(--c); outline-offset: 1px; }
.chunk.reserved { background: transparent; border: 1px dashed rgba(122,134,153,.4); color: var(--muted); }
.chunk.warn { background: rgba(224,90,90,.4); border: 1px solid var(--warn); color: #fff; --c: var(--warn); }

.raw-info { min-height: 150px; border-top: 1px solid var(--border); padding-top: 18px; }
.raw-info .summary { font-weight: 600; margin: 0 0 12px; }
.field { display: grid; grid-template-columns: 12px minmax(0, 1fr); gap: 10px; padding: 8px 0; }
.field + .field { border-top: 1px dashed var(--border); }
.field .sw { margin-top: 6px; }
.field-name { font-family: var(--mono); font-size: .86rem; font-weight: 600; }
.field-bits { color: var(--muted); font-size: .78rem; font-family: var(--mono); margin-left: 8px; }
.field-desc { color: var(--muted); font-size: .9rem; margin: 2px 0; }
.field-val { font-family: var(--mono); font-size: .86rem; }
.field-val b { color: var(--accent); }
.field.warn .field-val { color: var(--warn); }
.hint { color: var(--muted); font-size: .92rem; }

.legend { list-style: none; padding: 16px 0 0; margin: 16px 0 0; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: .78rem; color: var(--muted); }
.legend li { display: inline-flex; align-items: center; gap: 6px; }

/* ---------- platforms ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table.platforms { width: 100%; border-collapse: collapse; font-size: .94rem; min-width: 620px; }
.platforms th, .platforms td { text-align: left; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.platforms th { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); background: var(--surface-2); }
.platforms tr:last-child td { border-bottom: 0; }
.status { font-size: .76rem; font-weight: 650; padding: 3px 9px; border-radius: 999px; white-space: nowrap; }
.s-ok { color: var(--m2); background: rgba(34,176,125,.13); }
.s-beta { color: var(--sysex); background: rgba(224,160,48,.12); }
.note { color: var(--muted); font-size: .9rem; margin: 18px 0 0; max-width: 52em; }

/* ---------- roadmap ---------- */
.roadmap { list-style: none; counter-reset: r; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 16px; }
.roadmap li { counter-increment: r; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; gap: 6px; }
.roadmap li::before { content: counter(r, decimal-leading-zero); font-family: var(--mono); font-size: .8rem; color: var(--accent); }
.roadmap span { color: var(--muted); font-size: .9rem; }

/* ---------- download ---------- */
.download {
  display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: 32px; align-items: center;
  padding: 40px; border-radius: 18px; border: 1px solid var(--border);
  background: radial-gradient(600px 300px at 100% 0%, rgba(76,141,246,.16), transparent 60%), radial-gradient(500px 300px at 0% 100%, rgba(34,176,125,.14), transparent 60%), var(--surface);
}
.download p { color: var(--muted); margin: 0; }
.download-logo { display: block; width: 96px; height: 96px; margin: -8px 0 12px -6px; filter: drop-shadow(0 12px 28px rgba(0,0,0,.6)) drop-shadow(0 0 22px rgba(76,141,246,.18)); }
.download-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }
.download-actions .fineprint { margin-top: 6px; }
.download-actions .fineprint + .fineprint { margin-top: 0; }
@media (max-width: 820px) { .download { grid-template-columns: minmax(0, 1fr); padding: 28px 20px; } }

.build { margin-top: 48px; }
pre { background: #0a0e14; border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; overflow-x: auto; font-size: .86rem; line-height: 1.7; margin: 0; }
pre code { background: none; padding: 0; font-size: inherit; }
pre .c { color: #5f6b80; }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--border); padding: 28px 0; font-size: .86rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.muted { color: var(--muted); }