:root {
  color-scheme: dark;
  --background: #09100f;
  --surface: #111b19;
  --surface-strong: #172522;
  --line: rgba(212, 244, 227, 0.14);
  --text: #f0f7f3;
  --muted: #9cafaa;
  --accent: #8ee6b8;
  --accent-deep: #45b47c;
  --page: min(1120px, calc(100% - 40px));
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--background);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 84% 4%, rgba(69, 180, 124, 0.16), transparent 28rem),
    linear-gradient(180deg, #0b1312 0%, var(--background) 42rem);
}

a {
  color: inherit;
}

.site-header,
main,
footer {
  width: var(--page);
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 84px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  color: var(--text);
  font-weight: 720;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  width: 18px;
  height: 18px;
  border: 5px solid var(--accent);
  border-top-color: transparent;
  border-radius: 50%;
  transform: rotate(18deg);
}

nav {
  display: flex;
  gap: 28px;
}

nav a {
  color: var(--muted);
  font-size: 0.92rem;
  text-decoration: none;
  transition: color 160ms ease;
}

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

.hero {
  display: grid;
  align-content: center;
  min-height: 590px;
  max-width: 860px;
  padding: 96px 0 72px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.8rem);
  font-weight: 720;
  letter-spacing: -0.065em;
  line-height: 0.94;
}

.lead {
  max-width: 720px;
  margin: 32px 0 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.65;
}

.signal {
  display: inline-flex;
  gap: 10px;
  align-items: center;
  width: max-content;
  margin-top: 40px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: #c8d8d2;
  background: rgba(255, 255, 255, 0.025);
  font-size: 0.86rem;
}

.signal-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 16px rgba(142, 230, 184, 0.7);
}

.notes {
  padding: 88px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 36px;
}

h2 {
  max-width: 620px;
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -0.045em;
  line-height: 1.05;
}

.note-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.note-card {
  min-height: 285px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.015));
}

.note-number {
  display: block;
  margin-bottom: 72px;
  color: var(--accent);
  font: 700 0.82rem ui-monospace, SFMono-Regular, Menlo, monospace;
}

.note-card h3 {
  margin: 0 0 12px;
  font-size: 1.25rem;
}

.note-card p,
.brief > p,
.prose p,
.missing p {
  color: var(--muted);
  line-height: 1.7;
}

.note-card p {
  margin: 0;
  font-size: 0.95rem;
}

.brief {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 72px;
  align-items: end;
  margin-bottom: 80px;
  padding: 56px;
  border-radius: 28px;
  background: var(--surface-strong);
}

.brief > p {
  margin: 0;
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 28px 0 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

.article-layout {
  min-height: calc(100vh - 170px);
  padding: 96px 0 110px;
}

.prose {
  max-width: 760px;
}

.prose h1 {
  margin-bottom: 42px;
  font-size: clamp(3rem, 7vw, 5.5rem);
}

.prose h2 {
  margin-top: 50px;
  font-size: 1.6rem;
}

.prose p {
  font-size: 1.04rem;
}

.text-link {
  display: inline-flex;
  gap: 10px;
  margin-top: 36px;
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--text);
}

.missing {
  display: grid;
  place-content: center;
  min-height: 100vh;
  max-width: 680px;
  text-align: center;
}

.missing-code {
  color: var(--accent);
  font: 700 0.82rem ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.18em;
}

.missing h1 {
  margin-top: 20px;
  font-size: clamp(3rem, 8vw, 5.5rem);
}

.missing .text-link {
  justify-self: center;
}

@media (max-width: 760px) {
  :root {
    --page: min(100% - 28px, 1120px);
  }

  .site-header {
    align-items: flex-start;
    gap: 22px;
    padding: 22px 0;
  }

  nav {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 10px 18px;
  }

  .hero {
    min-height: auto;
    padding: 92px 0;
  }

  h1 {
    font-size: clamp(3rem, 15vw, 5rem);
  }

  .note-grid,
  .brief {
    grid-template-columns: 1fr;
  }

  .note-number {
    margin-bottom: 42px;
  }

  .brief {
    gap: 28px;
    padding: 34px 26px;
  }

  .article-layout {
    padding-top: 76px;
  }
}

@media (max-width: 500px) {
  .site-header,
  footer {
    display: grid;
  }

  nav {
    justify-content: flex-start;
  }

  footer {
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}