@font-face {
  font-family: "Tektur";
  src: url("assets/fonts/Tektur-Medium.ttf") format("truetype");
  font-style: normal;
  font-weight: 500;
  font-display: swap;
}

@font-face {
  font-family: "Instrument Sans";
  src: url("assets/fonts/InstrumentSans-Regular.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/JetBrainsMono-Regular.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

:root {
  --bg: #051019;
  --bg-elevated: rgba(10, 26, 37, 0.86);
  --bg-panel: rgba(9, 25, 34, 0.72);
  --bg-panel-strong: rgba(5, 18, 28, 0.92);
  --line: rgba(111, 249, 236, 0.18);
  --line-strong: rgba(111, 249, 236, 0.55);
  --accent: #6ff9ec;
  --accent-soft: #1db8bc;
  --text: #efffff;
  --muted: #9cc0bc;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
  --radius-lg: 30px;
  --radius-md: 22px;
  --radius-sm: 16px;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at top left, rgba(17, 91, 101, 0.22), transparent 28rem),
    radial-gradient(circle at 82% 12%, rgba(91, 255, 231, 0.12), transparent 24rem),
    linear-gradient(180deg, #06121b 0%, #041019 40%, #030b11 100%);
  color: var(--text);
  font-family: "Instrument Sans", sans-serif;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -3;
  background-image:
    linear-gradient(rgba(111, 249, 236, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 249, 236, 0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 88%);
  content: "";
}

body::after {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(130deg, rgba(111, 249, 236, 0.07), transparent 30%),
    linear-gradient(320deg, rgba(29, 184, 188, 0.09), transparent 30%);
  mix-blend-mode: screen;
  pointer-events: none;
  content: "";
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

code,
pre {
  font-family: "JetBrains Mono", monospace;
}

.skip-link {
  position: absolute;
  top: -999px;
  left: 1rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  border-radius: 999px;
  background: var(--text);
  color: #031118;
}

.skip-link:focus {
  top: 1rem;
}

.site-shell {
  position: relative;
  overflow: clip;
}

.ambient {
  position: absolute;
  z-index: -1;
  border-radius: 999px;
  filter: blur(36px);
}

.ambient-a {
  top: 8rem;
  right: -9rem;
  width: 26rem;
  height: 26rem;
  background: rgba(111, 249, 236, 0.12);
}

.ambient-b {
  top: 36rem;
  left: -10rem;
  width: 24rem;
  height: 24rem;
  background: rgba(45, 150, 160, 0.12);
}

.topbar,
.section,
.footer {
  width: min(calc(100% - 2rem), var(--max-width));
  margin-inline: auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-top: 1rem;
  padding: 1rem 1.2rem;
  border: 1px solid rgba(111, 249, 236, 0.18);
  border-radius: 999px;
  background: rgba(4, 14, 21, 0.72);
  backdrop-filter: blur(18px);
  transition:
    border-color 200ms ease,
    background 200ms ease,
    box-shadow 200ms ease,
    transform 200ms ease;
}

.topbar.is-scrolled {
  border-color: rgba(111, 249, 236, 0.28);
  background: rgba(4, 14, 21, 0.9);
  box-shadow: var(--shadow);
  transform: translateY(0.15rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
}

.brand img {
  width: min(17rem, 58vw);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.4rem;
}

.nav a {
  padding: 0.72rem 1rem;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.92rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition:
    color 180ms ease,
    background-color 180ms ease,
    border-color 180ms ease;
}

.nav a:hover,
.nav a[aria-current="true"] {
  background: rgba(111, 249, 236, 0.12);
  color: var(--text);
}

.section {
  padding: 5rem 0 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(18rem, 0.92fr);
  gap: 2rem;
  align-items: center;
  min-height: calc(100vh - 7rem);
  padding-top: 4rem;
}

.eyebrow,
.panel-label,
.card-index {
  margin: 0;
  color: var(--accent);
  font-family: "Tektur", sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero h1,
.section-heading h2 {
  margin: 0;
  font-family: "Tektur", sans-serif;
  font-weight: 500;
  line-height: 0.94;
}

.hero h1 {
  margin-top: 1rem;
  font-size: clamp(3.2rem, 8vw, 6.8rem);
  letter-spacing: -0.04em;
}

.hero-dek,
.section-heading p,
.feature-panel p,
.info-card p,
.use-card p,
.faq-item p,
.hero-note,
.footer p,
.stat-card dd {
  color: var(--muted);
  line-height: 1.7;
}

.hero-dek {
  max-width: 42rem;
  margin: 1.2rem 0 0;
  font-size: clamp(1rem, 1.8vw, 1.15rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  padding: 0.85rem 1.3rem;
  border: 1px solid rgba(111, 249, 236, 0.16);
  border-radius: 999px;
  font-family: "Tektur", sans-serif;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition:
    transform 180ms ease,
    border-color 180ms ease,
    background-color 180ms ease,
    color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, rgba(111, 249, 236, 0.16), rgba(111, 249, 236, 0.28));
  color: var(--text);
}

.button-secondary {
  background: rgba(4, 16, 24, 0.68);
  color: var(--muted);
}

.hero-note {
  max-width: 42rem;
  margin: 1rem 0 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 2rem 0 0;
}

.stat-card,
.info-card,
.feature-panel,
.rail-panel,
.use-card,
.faq-item,
.signal-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(111, 249, 236, 0.16);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(11, 28, 39, 0.88), rgba(5, 17, 25, 0.74));
  box-shadow: var(--shadow);
}

.stat-card::before,
.info-card::before,
.feature-panel::before,
.rail-panel::before,
.use-card::before,
.faq-item::before,
.signal-card::before {
  position: absolute;
  inset: 0;
  background: linear-gradient(125deg, rgba(111, 249, 236, 0.08), transparent 44%);
  pointer-events: none;
  content: "";
}

.stat-card {
  margin: 0;
  padding: 1.2rem;
}

.stat-card dt {
  color: var(--accent);
  font-family: "Tektur", sans-serif;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.stat-card dd {
  margin: 0.65rem 0 0;
  font-size: 1rem;
}

.stat-card code {
  color: var(--text);
  word-break: break-word;
}

.hero-stage {
  position: relative;
  min-height: 34rem;
}

.hero-grid {
  position: absolute;
  inset: 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(111, 249, 236, 0.12);
  background:
    linear-gradient(rgba(111, 249, 236, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(111, 249, 236, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(circle at center, rgba(0, 0, 0, 1), transparent 92%);
}

.signal-card {
  background: rgba(5, 19, 27, 0.82);
  backdrop-filter: blur(14px);
}

.signal-card-main {
  position: absolute;
  top: 1rem;
  right: 0;
  left: 2.5rem;
  padding: 1.4rem;
}

.signal-frame {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 21rem;
  border: 1px solid rgba(111, 249, 236, 0.18);
  border-radius: 1.5rem;
  background:
    radial-gradient(circle at center, rgba(111, 249, 236, 0.08), transparent 52%),
    rgba(6, 19, 27, 0.76);
}

.signal-frame img {
  width: min(16rem, 70%);
}

.signal-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1rem;
}

.signal-metrics span {
  padding: 0.62rem 0.78rem;
  border: 1px solid rgba(111, 249, 236, 0.16);
  border-radius: 999px;
  color: var(--muted);
  font-family: "Tektur", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
}

.signal-card-code {
  position: absolute;
  right: 1rem;
  bottom: -1rem;
  width: min(24rem, calc(100% - 4rem));
  padding: 1rem 1.1rem;
}

.signal-card-code pre {
  margin: 0.9rem 0 0;
  color: var(--text);
  white-space: pre-wrap;
}

.section-heading {
  display: grid;
  gap: 0.75rem;
  max-width: 46rem;
}

.section-heading h2 {
  font-size: clamp(2.1rem, 5vw, 3.6rem);
}

.overview-grid,
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.8rem;
}

.use-case-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.info-card,
.use-card {
  padding: 1.4rem;
}

.info-card h3,
.feature-panel h3,
.use-card h3 {
  margin: 0.7rem 0 0;
  font-size: 1.2rem;
}

.feature-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(16rem, 0.75fr);
  gap: 1rem;
  align-items: start;
}

.feature-column {
  display: grid;
  gap: 1rem;
}

.feature-panel,
.rail-panel {
  padding: 1.4rem;
}

.feature-panel p,
.rail-panel .link-stack,
.checklist {
  margin: 0.9rem 0 0;
}

.feature-rail {
  display: grid;
  gap: 1rem;
}

.checklist,
.link-stack {
  display: grid;
  gap: 0.8rem;
  padding: 0;
  list-style: none;
}

.checklist li,
.link-stack a {
  position: relative;
  padding-left: 1.2rem;
  color: var(--muted);
  line-height: 1.6;
}

.checklist li::before,
.link-stack a::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  content: ">";
}

.link-stack a:hover {
  color: var(--text);
}

.faq-section {
  padding-bottom: 4rem;
}

.faq-list {
  display: grid;
  gap: 1rem;
  margin-top: 1.8rem;
}

.faq-item {
  padding: 1.1rem 1.25rem 1.25rem;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  font-family: "Tektur", sans-serif;
  font-size: 1.08rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  margin: 0.9rem 0 0;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding: 0 0 2rem;
  border-top: 1px solid rgba(111, 249, 236, 0.12);
}

.footer p {
  margin: 1.25rem 0 0;
  font-size: 0.95rem;
}

.reveal {
  opacity: 1;
  transform: translateY(0);
}

.has-js .reveal {
  opacity: 0;
  transform: translateY(26px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

.has-js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .button,
  .topbar {
    transition: none;
  }
}

@media (max-width: 1080px) {
  .hero,
  .feature-layout,
  .overview-grid,
  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-stage {
    min-height: 30rem;
  }

  .signal-card-main {
    left: 0;
  }
}

@media (max-width: 760px) {
  .topbar {
    flex-direction: column;
    align-items: stretch;
    border-radius: 1.4rem;
  }

  .brand {
    justify-content: center;
  }

  .nav {
    justify-content: center;
  }

  .section {
    padding-top: 4rem;
  }

  .hero {
    min-height: auto;
    padding-top: 2rem;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-stage {
    min-height: 26rem;
  }

  .signal-card-code {
    position: relative;
    right: auto;
    bottom: auto;
    width: auto;
    margin: 16rem 1rem 0;
  }

  .signal-frame {
    min-height: 16rem;
  }

  .footer {
    padding-bottom: 2.5rem;
  }
}