:root {
  color-scheme: dark;
  --bg: #100b21;
  --panel: rgba(15, 13, 30, 0.78);
  --panel-strong: rgba(9, 8, 20, 0.9);
  --text: #f8f7ff;
  --muted: #c9c4d8;
  --soft: #9b94ad;
  --line: rgba(255, 255, 255, 0.14);
  --accent: #7dd3fc;
  --accent-strong: #52c7f8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(16, 11, 33, 0.38), rgba(16, 11, 33, 0.94)),
    url("assets/feature_graphic_1024x500.png") top center / cover no-repeat,
    var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent);
}

.site-header,
.site-footer,
main {
  width: min(980px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  font-size: 20px;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 10px;
}

.nav {
  display: flex;
  gap: 18px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 700;
}

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

.hero {
  min-height: 560px;
  display: grid;
  align-items: center;
  padding: 48px 0 72px;
}

.hero-content {
  max-width: 680px;
}

.eyebrow {
  color: var(--accent);
  font-weight: 800;
  margin: 0 0 12px;
}

h1 {
  font-size: clamp(44px, 8vw, 82px);
  line-height: 0.96;
  margin: 0 0 22px;
  letter-spacing: 0;
}

h2 {
  font-size: 28px;
  line-height: 1.2;
  margin: 34px 0 10px;
}

h3 {
  font-size: 20px;
  margin: 24px 0 8px;
}

p,
li {
  color: var(--muted);
  font-size: 18px;
}

.lead {
  font-size: 22px;
  color: #e4e0ee;
  max-width: 650px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  color: #0d1823;
  background: var(--accent);
  text-decoration: none;
  font-weight: 800;
}

.button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--line);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  backdrop-filter: blur(16px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 28px 0 70px;
}

.feature {
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
}

.feature p {
  margin-bottom: 0;
}

.doc {
  background: rgba(10, 8, 22, 0.86);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 34px;
  margin: 34px 0 60px;
}

.doc h1 {
  font-size: clamp(34px, 6vw, 56px);
}

.date {
  color: var(--soft);
  margin-top: -10px;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 22px 0 34px;
  color: var(--soft);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .hero {
    min-height: 520px;
    padding-top: 28px;
  }

  .doc {
    padding: 24px;
  }
}