:root {
  --ink: #141414;
  --paper: #171717;
  --card: #fff;
  --soft: #f7f7f4;
  --line: #d7d7d2;
  --muted: #55555a;
  --dim: #d8d8dc;
  --gold: #c9a24f;
  --blue: #4b728a;
  --green: #506b4f;
  --red: #9d463e;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: #f5f5f7;
  background:
    radial-gradient(circle at 8% -8%, rgba(75,114,138,.24), transparent 28rem),
    radial-gradient(circle at 92% 2%, rgba(201,162,79,.18), transparent 30rem),
    linear-gradient(180deg, #0b0b0d 0%, #111114 48%, #171717 100%);
}

a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.shell { width: min(100% - 36px, 1220px); margin: 0 auto; }

header {
  position: sticky;
  top: 0;
  z-index: 12;
  border-bottom: 1px solid rgba(255,255,255,.10);
  background: rgba(11,11,13,.88);
  backdrop-filter: blur(18px);
}

.topbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  gap: 1rem;
  align-items: center;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .72rem;
  font-weight: 950;
  letter-spacing: -.04em;
}

.mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 15px;
  background: #f5f5f7;
  color: #0b0b0d;
}

.brand span span {
  display: block;
  color: #d8d8dc;
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
}

nav {
  display: flex;
  gap: .35rem;
  flex-wrap: wrap;
  justify-content: center;
}

nav a,
.button,
.btn,
.btn-secondary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: .72rem .94rem;
  border-radius: 999px;
  font-size: .82rem;
  font-weight: 900;
  letter-spacing: .02em;
}

nav a { color: #f5f5f7; }
nav a[aria-current="page"],
nav a:hover { background: rgba(255,255,255,.08); color: #d8d8dc; }
.button,
.btn.solid {
  border: 1px solid #f5f5f7;
  background: #f5f5f7;
  color: #0b0b0d;
}
.btn-secondary,
.btn-ghost,
.button.secondary {
  border: 1px solid rgba(255,255,255,.18);
  background: rgba(255,255,255,.07);
  color: #f5f5f7;
}

main { padding: 1rem 0 3rem; }
.stack { display: grid; gap: 1rem; }
.hero,
.section,
.product-shell {
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 34px;
  background:
    radial-gradient(circle at 100% 0%, rgba(201,162,79,.12), transparent 24rem),
    radial-gradient(circle at 0% 100%, rgba(75,114,138,.16), transparent 24rem),
    linear-gradient(145deg, rgba(255,255,255,.065), rgba(255,255,255,.025)),
    #111114;
  box-shadow: none;
  overflow: hidden;
}

.hero {
  min-height: 440px;
  display: grid;
  align-items: end;
  padding: clamp(24px, 5vw, 56px);
}

.section,
.product-shell { padding: clamp(20px, 4vw, 44px); }
.eyebrow {
  margin: 0;
  color: rgba(245,245,247,.68);
  font-size: .78rem;
  font-weight: 1000;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 16ch;
  margin-bottom: 0;
  font-size: clamp(2.7rem, 6.4vw, 5.8rem);
  line-height: .88;
  letter-spacing: -.075em;
  color: #f5f5f7;
}
h2 {
  margin-bottom: .45rem;
  font-size: clamp(1.75rem, 3.8vw, 3.1rem);
  line-height: .95;
  letter-spacing: -.065em;
}
h3 { margin-bottom: .45rem; line-height: 1.08; }
p { color: rgba(245,245,247,.78); line-height: 1.55; }
.sub { max-width: 64ch; margin-top: 1rem; color: rgba(255,255,255,.88); font-size: clamp(1rem, 1.25vw, 1.16rem); }
.actions { display: flex; flex-wrap: wrap; gap: .72rem; margin-top: 1.2rem; }

.section-head {
  display: grid;
  grid-template-columns: minmax(0,.78fr) minmax(0,1fr);
  gap: clamp(18px,3vw,42px);
  align-items: end;
  margin-bottom: 18px;
}
.section-head p { max-width: 68ch; }

.grid,
.metric-grid,
.card-grid,
.packet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

.card,
.metric-card,
.panel-card,
.packet-card,
.read-card,
.source-card,
.notice,
.output-box,
.field {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  color: #141414;
  box-shadow: none;
}

.card,
.metric-card,
.panel-card,
.packet-card,
.read-card,
.source-card,
.notice,
.output-box { padding: 14px; }

.card h3,
.metric-card strong,
.panel-card h3,
.packet-card strong,
.read-card strong,
.source-card strong,
.output-box strong { color: #141414; }
.card p,
.metric-card span,
.panel-card p,
.packet-card span,
.read-card span,
.source-card span,
.notice,
.output-box,
.field small { color: #333336; }
.card span,
.read-card .label,
.metric-card .label {
  display: block;
  color: #686868;
  font-size: .68rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
}

a.card,
button.card,
button.packet-card {
  text-align: left;
  transition: border-color .15s ease, transform .15s ease;
}
a.card:hover,
button.card:hover,
button.packet-card:hover,
button.packet-card[aria-pressed="true"] {
  border-color: #9d9d94;
  background: #f7f7f4;
  transform: translateY(-1px);
}

label {
  display: grid;
  gap: .3rem;
  color: #686868;
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .09em;
  text-transform: uppercase;
}
input, select, textarea {
  width: 100%;
  border: 1px solid #d7d7d2;
  border-radius: 14px;
  background: #f7f7f4;
  color: #141414;
  padding: .76rem .8rem;
  outline: none;
}
textarea { min-height: 96px; resize: vertical; }
input:focus, select:focus, textarea:focus {
  border-color: #9d9d94;
  box-shadow: 0 0 0 3px rgba(20,20,20,.08);
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.form-grid .wide { grid-column: 1 / -1; }

.scorebar {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(20,20,20,.10);
  margin-top: .55rem;
}
.scorebar i {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--gold));
  transition: width .2s ease;
}

.mini-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-top: 1rem;
}
.mini-nav a {
  border: 1px solid #d7d7d2;
  border-radius: 999px;
  background: #fff;
  color: #141414;
  padding: .5rem .72rem;
  font-size: .82rem;
  font-weight: 850;
}

footer {
  border-top: 1px solid rgba(255,255,255,.10);
  color: #a1a1a6;
  background: #0b0b0d;
  padding: 24px 0;
  font-size: .9rem;
}
footer a { color: #f5f5f7; text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 900px) {
  .topbar,
  .section-head,
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .wide { grid-column: auto; }
  nav { justify-content: flex-start; }
}