/* Layout: one 68rem column; hero pairs the pitch with a rendered certificate chain,
   then capability grid, protocol table, quickstart, release verification, maturity, footer.
   Palette and type match the product UI (ui/src/index.css): warm stone neutrals,
   sage primary, amber and brick states, Geist; wordmark gradient from the app sidebar. */
:root {
  --bg: #1a1917;
  --surface: #201e1b;
  --surface-2: #242220;
  --fg: #ece9e4;
  --muted: #a5a099;
  --border: #2c2a27;
  --accent: #7fae8c;
  --accent-fg: #16150f;
  --accent-2: #d8a657;
  --ok: #7fae8c;
  --warn: #d8a657;
  --danger: #c05f4e;
  --code-bg: #161513;
  --edge: #4a463f;
  --shadow: 0 0 0 1px rgba(255, 255, 255, 0.03), 0 10px 28px -6px rgba(0, 0, 0, 0.65), 0 2px 6px rgba(0, 0, 0, 0.4);
  --brand-a: #45c6e8;
  --brand-b: #839ef2;
  --font-display: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.6rem;
  --step-3: clamp(2.1rem, 1.4rem + 3vw, 3.4rem);
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #fcfcfb; --surface: #ffffff; --surface-2: #f7f7f5; --fg: #17191c;
    --muted: #707378; --border: #e6e6e3; --accent: #1f6f4f; --accent-fg: #fcfcfb;
    --accent-2: #a86a12; --ok: #1f6f4f; --warn: #a26611; --danger: #a8342a;
    --code-bg: #f0f0ec; --brand-a: #1b8fb3; --brand-b: #4f63c9; --edge: #d8d8d4;
    --shadow: 0 1px 2px rgba(23, 25, 28, 0.06), 0 10px 28px -8px rgba(23, 25, 28, 0.16); color-scheme: light;
  }
}
:root[data-theme="light"] {
  --bg: #fcfcfb; --surface: #ffffff; --surface-2: #f7f7f5; --fg: #17191c;
  --muted: #707378; --border: #e6e6e3; --accent: #1f6f4f; --accent-fg: #fcfcfb;
  --accent-2: #a86a12; --ok: #1f6f4f; --warn: #a26611; --danger: #a8342a;
  --code-bg: #f0f0ec; --brand-a: #1b8fb3; --brand-b: #4f63c9; --edge: #d8d8d4;
    --shadow: 0 1px 2px rgba(23, 25, 28, 0.06), 0 10px 28px -8px rgba(23, 25, 28, 0.16); color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 var(--step-0)/1.6 var(--font-body);
  padding-inline: 16px;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
.wrap { max-width: 68rem; margin-inline: auto; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; text-wrap: balance; margin: 0; }
h2 { font-size: var(--step-2); }
h3 { font-size: var(--step-1); font-family: var(--font-body); font-weight: 600; }
p { margin: 0; }
.muted { color: var(--muted); }
.label {
  font: 500 0.75rem/1 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* Header */
header.site {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding-block: 1.25rem; border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 0.6rem; color: var(--fg); text-decoration: none; font: 600 1.15rem/1 var(--font-display); letter-spacing: -0.01em; }
.brand .tile { width: 30px; height: 30px; flex: none; border-radius: 8px; background: var(--ok); color: var(--accent-fg); display: grid; place-items: center; }
.brand .tile svg { width: 18px; height: 18px; }
.brand .word { background: linear-gradient(90deg, var(--brand-a), var(--brand-b)); -webkit-background-clip: text; background-clip: text; color: transparent; }
nav.top { display: flex; flex-wrap: wrap; gap: 1.25rem; font-size: var(--step--1); }
nav.top a { color: var(--muted); text-decoration: none; }
nav.top a:hover { color: var(--fg); }

/* Hero */
.hero {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 3rem; align-items: center; padding-block: 4rem 3.5rem;
}
.hero h1 { font-size: var(--step-3); letter-spacing: -0.01em; }
.hero .lede { font-size: var(--step-1); color: var(--muted); max-width: 36rem; margin-top: 1.25rem; line-height: 1.5; }
.hero .stack { display: flex; flex-direction: column; gap: 0; }
.cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.1rem; border-radius: 6px; font-weight: 600; font-size: var(--step--1);
  text-decoration: none; border: 1px solid var(--border); color: var(--fg); background: var(--surface);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn:hover { border-color: var(--accent); }
.meta-line { margin-top: 1.25rem; font: 400 var(--step--1)/1.5 var(--font-mono); color: var(--muted); }

/* Certificate chain: the product's own subject matter, shown as the hero image */
.chain { display: flex; flex-direction: column; gap: 0; font-family: var(--font-mono); font-size: 0.8rem; }
.cert {
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
  padding: 0.9rem 1rem; display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 0.2rem 1rem;
}
.cert .kind { grid-column: 1 / -1; display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.35rem; }
.cert .kind b { font: 600 0.85rem/1 var(--font-body); color: var(--fg); }
.cert dt { color: var(--muted); }
.cert dd { margin: 0; color: var(--fg); overflow-wrap: anywhere; }
.cert.leaf { border-color: var(--accent); }
.pill { font: 500 0.7rem/1 var(--font-mono); padding: 0.25rem 0.5rem; border-radius: 999px; border: 1px solid currentColor; }
.pill.ok { color: var(--ok); }
.pill.renew { color: var(--accent-2); }
.link { display: flex; align-items: center; gap: 0.5rem; padding: 0.35rem 0 0.35rem 1.4rem; color: var(--muted); font-size: 0.72rem; }
.link::before { content: ""; width: 1px; height: 1.2rem; background: var(--border); }

section { padding-block: 3.5rem; border-top: 1px solid var(--border); }
.section-head { display: flex; flex-direction: column; gap: 0.6rem; margin-bottom: 2rem; max-width: 42rem; }

/* Capabilities */
.caps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem 2.5rem; }
.cap { display: flex; flex-direction: column; gap: 0.5rem; min-width: 0; }
.cap p { color: var(--muted); font-size: 0.95rem; }

/* Protocols */
.table-scroll { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; min-width: 34rem; }
th, td { text-align: left; padding: 0.7rem 1rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font: 500 0.75rem/1 var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); background: var(--surface); }
tr:last-child td { border-bottom: 0; }
td.proto { font-weight: 600; white-space: nowrap; }
td.rfc { font-family: var(--font-mono); font-variant-numeric: tabular-nums; color: var(--accent-2); white-space: nowrap; }

/* Code */
.code {
  position: relative; background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px;
}
.code pre { margin: 0; padding: 1.1rem 1.2rem; overflow-x: auto; font: 400 0.85rem/1.65 var(--font-mono); color: var(--fg); }
.code .c { color: var(--muted); }
.copy {
  position: absolute; top: 0.6rem; right: 0.6rem; font: 500 0.72rem/1 var(--font-body);
  background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); border-radius: 4px; padding: 0.35rem 0.55rem; cursor: pointer;
}
.copy:hover { color: var(--fg); }
.two { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2.5rem; }
.two > div { display: flex; flex-direction: column; gap: 1rem; min-width: 0; }
.two p { color: var(--muted); }

/* Maturity */
.maturity { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; }
.tier { display: flex; flex-direction: column; gap: 0.75rem; padding-top: 1rem; border-top: 3px solid var(--border); min-width: 0; }
.tier.validated { border-top-color: var(--ok); }
.tier.beta { border-top-color: var(--warn); }
.tier.exp { border-top-color: var(--danger); }
.tier ul { margin: 0; padding-left: 1.1rem; color: var(--muted); font-size: 0.95rem; display: flex; flex-direction: column; gap: 0.35rem; }

footer.site { padding-block: 2.5rem 3rem; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 1.5rem 3rem; justify-content: space-between; font-size: var(--step--1); color: var(--muted); }
footer .contacts { display: flex; flex-direction: column; gap: 0.35rem; }
footer .addr { font-family: var(--font-mono); color: var(--fg); user-select: all; }

@media (max-width: 880px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 2.5rem; padding-block: 2.5rem; }
  .caps, .maturity { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .two { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
  .caps, .maturity { grid-template-columns: minmax(0, 1fr); }
  nav.top { display: none; }
}
@media (prefers-reduced-motion: no-preference) {
  .cert.leaf .pill.renew { animation: pulse 2.4s ease-in-out infinite; }
  @keyframes pulse { 50% { opacity: 0.55; } }
}

/* Tour page */
.tour-intro { padding-block: 3.5rem 2.5rem; display: flex; flex-direction: column; gap: 1rem; max-width: 46rem; }
.tour-intro h1 { font-size: var(--step-3); }
.tour-intro p { color: var(--muted); font-size: var(--step-1); line-height: 1.5; }
.chapter { padding-block: 3rem; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 2.5rem; }
.chapter > header { display: flex; flex-direction: column; gap: 0.6rem; max-width: 42rem; }
.shot { margin: 0; display: grid; grid-template-columns: minmax(0, 17rem) minmax(0, 1fr); gap: 1.5rem 2.5rem; align-items: start; }
.shot figcaption { display: flex; flex-direction: column; gap: 0.5rem; padding-top: 0.5rem; }
.shot figcaption p { color: var(--muted); font-size: 0.95rem; }
.shot .route { font: 400 0.75rem/1 var(--font-mono); color: var(--accent-2); }
.frame { border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--surface); min-width: 0; }
.frame .bar { display: flex; align-items: center; gap: 0.4rem; padding: 0.55rem 0.8rem; border-bottom: 1px solid var(--border); }
.frame .bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--border); }
.frame .bar span { margin-left: 0.6rem; font: 400 0.72rem/1 var(--font-mono); color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.frame a { display: block; }
.frame img { display: block; width: 100%; height: auto; }
.note { font-size: var(--step--1); color: var(--muted); }
@media (max-width: 880px) {
  .shot { grid-template-columns: minmax(0, 1fr); }
}

/* Elevation: dark stone surfaces sit too close to the page background, so
   framed content (screenshots, certificate cards, code, tables) gets a lighter
   edge and a soft shadow to lift it off the page. */
.frame, .cert, .code, .table-scroll {
  border-color: var(--edge);
  box-shadow: var(--shadow);
}
.cert.leaf { border-color: var(--accent); }
.frame .bar { background: var(--surface-2); }
.btn { box-shadow: 0 1px 2px rgba(0, 0, 0, 0.25); }