:root {
  color-scheme: light;
  --bg: #f6f6f3;
  --surface: #ffffff;
  --surface-soft: #f0f1fb;
  --ink: #151720;
  --muted: #5d6473;
  --line: #d9dce6;
  --accent: #4c53c6;
  --accent-dark: #30369a;
  --ok: #21725e;
  --shadow: 0 22px 50px rgba(30, 34, 60, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(76, 83, 198, 0.12), transparent 34rem),
    linear-gradient(180deg, #fbfbf8 0%, var(--bg) 42%, #eceef8 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent-dark);
  font-weight: 650;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 0 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand img {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  box-shadow: 0 10px 28px rgba(76, 83, 198, 0.2);
}

.brand strong {
  display: block;
  font-size: 1rem;
  line-height: 1.2;
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.2;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
  font-size: 0.95rem;
}

.nav a {
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--accent-dark);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  align-items: center;
  gap: 32px;
  padding: 64px 0 48px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.1;
}

h1 {
  max-width: 820px;
  font-size: clamp(2.45rem, 7vw, 5.2rem);
  font-weight: 760;
}

h2 {
  margin-top: 48px;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
}

h3 {
  margin-top: 28px;
  font-size: 1.08rem;
}

p,
li {
  color: var(--muted);
  font-size: 1.02rem;
}

.lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: #373d4c;
  font-size: clamp(1.08rem, 2vw, 1.28rem);
}

.hero-card,
.card {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 24px;
}

.hero-card img {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  margin-bottom: 18px;
}

.status-list {
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 20px 0 0;
  list-style: none;
}

.status-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: #303544;
}

.status-list li::before {
  content: "";
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  margin-top: 0.55rem;
  border-radius: 999px;
  background: var(--ok);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 34px 0 60px;
}

.card {
  display: block;
  min-height: 210px;
  padding: 24px;
  color: inherit;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(76, 83, 198, 0.35);
  box-shadow: 0 28px 60px rgba(30, 34, 60, 0.16);
}

.card .kicker {
  margin: 0 0 16px;
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.card h2 {
  margin: 0;
  font-size: 1.35rem;
}

.content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 36px;
  align-items: start;
  padding: 38px 0 72px;
}

.article {
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.article h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
}

.article ul {
  padding-left: 1.25rem;
}

.meta {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.toc {
  position: sticky;
  top: 18px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.74);
}

.toc strong {
  display: block;
  margin-bottom: 10px;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}

.notice {
  padding: 18px 20px;
  border: 1px solid rgba(76, 83, 198, 0.22);
  border-radius: 18px;
  background: var(--surface-soft);
}

.notice p {
  margin: 0;
  color: #303544;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-weight: 750;
  text-decoration: none;
}

.button.secondary {
  border: 1px solid var(--line);
  background: white;
  color: var(--accent-dark);
}

.footer {
  padding: 34px 0 44px;
  border-top: 1px solid rgba(120, 126, 146, 0.26);
  color: var(--muted);
  font-size: 0.94rem;
}

.footer .shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 18px;
}

@media (max-width: 820px) {
  .topbar,
  .footer .shell {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    justify-content: flex-start;
  }

  .hero,
  .content {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 34px;
  }

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

  .toc {
    position: static;
  }

  .article {
    padding: 24px;
  }
}