:root {
  --bg: #edf6fb;
  --bg-strong: #d1eefc;
  --surface: rgba(245, 251, 254, 0.84);
  --surface-strong: rgba(255, 255, 255, 0.92);
  --ink: #0d2747;
  --muted: #556f88;
  --line: rgba(13, 39, 71, 0.12);
  --accent: #0ea5e9;
  --accent-deep: #154b74;
  --accent-soft: rgba(14, 165, 233, 0.12);
  --green: #7fd7ef;
  --shadow: 0 24px 80px rgba(13, 39, 71, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --site-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(14, 165, 233, 0.08), transparent 24%),
    radial-gradient(circle at 88% 10%, rgba(21, 75, 116, 0.08), transparent 26%),
    linear-gradient(180deg, #fbfeff 0%, var(--bg) 42%, #deeff8 100%);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  line-height: 1.5;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(21, 75, 116, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(21, 75, 116, 0.025) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.24), transparent 75%);
}

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

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

.page-shell {
  width: min(calc(100% - 40px), var(--site-width));
  margin: 0 auto;
  padding: 24px 0 56px;
}

.site-header,
.site-footer,
.hero,
.signal-band,
.wide-card,
.card,
.reference-preview,
.reference-code {
  backdrop-filter: blur(16px);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(249, 253, 255, 0.82);
  position: sticky;
  top: 18px;
  z-index: 5;
  box-shadow: 0 18px 50px rgba(13, 39, 71, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: #f5fdff;
  background: linear-gradient(135deg, #0f3156, var(--accent));
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  box-shadow: 0 12px 24px rgba(21, 75, 116, 0.2);
}

.brand-copy {
  display: grid;
}

.brand-copy strong {
  font-size: 1rem;
  line-height: 1;
}

.brand-copy span {
  color: var(--muted);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-top: 4px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--muted);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 28px;
  margin-top: 26px;
  padding: 34px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background:
    radial-gradient(circle at 18% 18%, rgba(127, 231, 255, 0.14), transparent 22%),
    radial-gradient(circle at 92% 82%, rgba(14, 165, 233, 0.12), transparent 24%),
    linear-gradient(160deg, #0f3156 0%, #154b74 44%, #0ea5e9 120%);
  box-shadow: var(--shadow);
  color: #f5fdff;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.eyebrow,
.panel-label,
.preview-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--accent-deep);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before,
.panel-label::before,
.preview-label::before {
  content: "";
  width: 34px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

h1,
h2,
h3,
strong {
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
}

h1 {
  margin: 18px 0 18px;
  font-size: clamp(2.7rem, 6vw, 5rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
  max-width: 11ch;
}

h2 {
  margin: 10px 0 0;
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

h3 {
  margin: 0 0 12px;
  font-size: 1.28rem;
  line-height: 1.1;
}

p {
  margin: 0;
}

.hero-text,
.section-heading p,
.card p,
.wide-card p,
.preview-note,
.site-footer p {
  color: var(--muted);
  font-size: 1.02rem;
}

.hero .eyebrow,
.hero .panel-label {
  color: #dff8ff;
}

.hero .hero-text {
  color: rgba(245, 253, 255, 0.88);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent-deep), var(--accent));
  color: #f5fdff;
  font-weight: 700;
  box-shadow: 0 12px 26px rgba(21, 75, 116, 0.22);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 16px 30px rgba(21, 75, 116, 0.28);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(21, 75, 116, 0.14);
  color: var(--accent-deep);
  box-shadow: none;
}

.hero .button:not(.button-secondary) {
  background: linear-gradient(135deg, #f8fdff, #d7f3ff);
  color: #0f3156;
  border-color: rgba(255, 255, 255, 0.45);
  box-shadow:
    0 16px 34px rgba(9, 28, 49, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.72);
}

.hero .button:not(.button-secondary):hover,
.hero .button:not(.button-secondary):focus-visible {
  box-shadow:
    0 18px 38px rgba(9, 28, 49, 0.28),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.hero .button-secondary {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(245, 253, 255, 0.28);
  color: #f5fdff;
}

.hero-panel {
  display: grid;
  gap: 18px;
  align-content: start;
  padding: 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(248, 252, 255, 0.94), rgba(234, 248, 255, 0.92));
  color: var(--ink);
  border: 1px solid rgba(209, 238, 252, 0.22);
}

.hero-panel-header {
  display: grid;
  gap: 8px;
}

.hero-panel-header .panel-label {
  color: var(--accent-deep);
}

.metric-list {
  display: grid;
  gap: 14px;
}

.metric-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(234, 248, 255, 0.9);
  border: 1px solid rgba(21, 75, 116, 0.08);
}

.metric-card span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.metric-card strong {
  font-size: 1.05rem;
  line-height: 1.2;
}

.signal-band {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 22px;
  align-items: center;
  margin-top: 24px;
  padding: 26px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(249, 253, 255, 0.94), rgba(234, 248, 255, 0.9));
}

.signal-copy {
  display: grid;
  gap: 10px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.tag-cloud span {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(21, 75, 116, 0.07);
  border: 1px solid rgba(21, 75, 116, 0.12);
  font-size: 0.92rem;
  color: var(--accent-deep);
}

.section {
  margin-top: 28px;
  padding: 12px 0 0;
}

.section-heading {
  max-width: 760px;
  display: grid;
  gap: 12px;
  margin-bottom: 18px;
}

.card-grid {
  display: grid;
  gap: 18px;
}

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

.card-grid-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 18px 48px rgba(12, 38, 70, 0.06);
}

.accent-card {
  background:
    linear-gradient(180deg, rgba(246, 252, 255, 0.98), rgba(234, 248, 255, 0.94));
}

.stacked-panels {
  display: grid;
  gap: 16px;
}

.wide-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--surface);
}

.panel-index {
  min-width: 64px;
  padding-top: 2px;
  color: var(--accent-deep);
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 1.05rem;
  font-weight: 700;
}

.reference-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 18px;
}

.reference-preview,
.reference-code {
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--surface-strong);
  box-shadow: 0 18px 48px rgba(12, 38, 70, 0.06);
}

.preview-stage {
  margin: 18px 0 14px;
  min-height: 180px;
  display: grid;
  place-items: center;
  border-radius: 20px;
  background:
    radial-gradient(circle at 18% 18%, rgba(127, 231, 255, 0.12), transparent 24%),
    linear-gradient(145deg, #0f3156, #154b74 62%, #0ea5e9 120%);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.reference-badge-link {
  display: inline-flex;
  padding: 14px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.04);
}

pre {
  margin: 18px 0 18px;
  padding: 18px;
  overflow-x: auto;
  border-radius: 18px;
  background: #0f3156;
  color: #eefcff;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
  font-size: 0.92rem;
  line-height: 1.6;
}

.copy-button {
  width: fit-content;
}

.copy-button.is-copied {
  background: linear-gradient(135deg, var(--green), var(--accent-deep));
  box-shadow: 0 12px 26px rgba(21, 75, 116, 0.2);
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 34px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: rgba(249, 253, 255, 0.84);
}

.footer-meta {
  display: grid;
  gap: 6px;
  color: var(--muted);
  text-align: right;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms ease, transform 700ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button {
    transition: none;
  }
}

@media (max-width: 980px) {
  .hero,
  .signal-band,
  .reference-layout {
    grid-template-columns: 1fr;
  }

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

  .tag-cloud {
    justify-content: flex-start;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-meta {
    text-align: left;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 24px), var(--site-width));
    padding-top: 14px;
  }

  .site-header {
    position: static;
    flex-direction: column;
    align-items: flex-start;
    border-radius: 26px;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 14px;
  }

  .hero,
  .signal-band,
  .card,
  .wide-card,
  .reference-preview,
  .reference-code,
  .site-footer {
    padding: 20px;
  }

  .card-grid-four,
  .card-grid-three {
    grid-template-columns: 1fr;
  }

  .wide-card {
    grid-template-columns: 1fr;
  }

  h1 {
    max-width: none;
    font-size: clamp(2.5rem, 11vw, 3.8rem);
  }

  h2 {
    font-size: clamp(1.8rem, 8vw, 2.4rem);
  }

  pre {
    font-size: 0.84rem;
  }
}