:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --paper: rgba(255, 255, 255, 0.9);
  --ink: #0f172a;
  --muted: #475569;
  --line: #d7e0ee;
  --brand: #0f5cc0;
  --brand-soft: #dceaff;
  --warm: #b45309;
  --shadow: 0 14px 36px rgba(15, 23, 42, 0.1);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 12%, rgba(79, 142, 255, 0.22), transparent 48%),
    radial-gradient(circle at 92% 8%, rgba(250, 204, 21, 0.14), transparent 44%),
    linear-gradient(180deg, #edf4ff 0%, var(--bg) 48%, #f8fbff 100%);
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", "Trebuchet MS", sans-serif;
  line-height: 1.45;
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  width: min(1060px, calc(100vw - 28px));
  margin: 18px auto 28px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(10px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(160deg, #1d4ed8 0%, #60a5fa 68%, #dbeafe 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.brand h1 {
  margin: 0;
  font-size: 16px;
  letter-spacing: 0.2px;
}

.brand p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nav a {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  color: #12305f;
  padding: 7px 11px;
  border-radius: 999px;
  font-size: 13px;
  text-decoration: none;
}

.nav a.active {
  border-color: rgba(15, 92, 192, 0.34);
  background: var(--brand-soft);
  color: #123f80;
}

.hero {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92) 0%, rgba(244, 248, 255, 0.92) 100%);
  box-shadow: var(--shadow);
  padding: 20px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  right: -40px;
  top: -70px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(29, 78, 216, 0.18), rgba(29, 78, 216, 0.02));
  pointer-events: none;
}

.hero h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.08;
  max-width: 720px;
}

.hero p {
  margin: 12px 0 0;
  color: var(--muted);
  max-width: 680px;
  font-size: 15px;
}

.cta-row {
  margin-top: 16px;
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border-radius: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: #16345d;
  font-size: 13px;
}

.btn.primary {
  border-color: rgba(15, 92, 192, 0.28);
  background: linear-gradient(180deg, #edf4ff 0%, #dbeafe 100%);
  color: #0f3f81;
}

.grid {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 12px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--paper);
  box-shadow: 0 10px 22px rgba(15, 23, 42, 0.06);
  padding: 14px;
}

.card h3 {
  margin: 0;
  font-size: 15px;
  color: #173564;
}

.card p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.list {
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 13px;
}

.list li + li {
  margin-top: 5px;
}

.band {
  margin-top: 14px;
  border: 1px solid rgba(180, 83, 9, 0.2);
  border-radius: 12px;
  background: rgba(255, 251, 235, 0.75);
  color: #7c4507;
  padding: 10px 12px;
  font-size: 13px;
}

.page {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: var(--shadow);
  padding: 18px;
}

.page h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 28px;
  line-height: 1.1;
}

.page .lede {
  margin: 10px 0 0;
  color: var(--muted);
}

.section {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.section h3 {
  margin: 0;
  font-size: 15px;
  color: #173564;
}

.section p,
.section li {
  color: var(--muted);
  font-size: 13px;
}

.footer {
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: rgba(15, 23, 42, 0.05);
  padding: 1px 5px;
  border-radius: 6px;
}

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

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

  .hero,
  .page {
    padding: 14px;
  }
}