:root {
  --bg: #eef4ff;
  --ink: #14243a;
  --muted: #5c6e89;
  --line: #d5e1f3;
  --card: #ffffff;
  --brand: #0a66d8;
  --brand-dark: #084fa8;
  --teal: #18b6b0;
  --ok: #177348;
  --warn: #a45714;
}

* {
  box-sizing: border-box;
}

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

body {
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 14% 8%, #dceaff 0%, transparent 28%),
    radial-gradient(circle at 87% 0%, #d7f4ff 0%, transparent 30%),
    linear-gradient(180deg, #ecf3ff 0%, #edf2f8 52%, #e5ebf5 100%);
}

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

a:hover {
  text-decoration: underline;
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 20px 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
}

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

.brand img {
  width: 32px;
  height: 32px;
  border-radius: 9px;
  box-shadow: 0 5px 14px rgba(4, 78, 147, 0.2);
}

.brand strong {
  font-size: 27px;
  letter-spacing: -0.02em;
}

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

.nav a {
  color: #23405f;
  font-weight: 700;
  font-size: 14px;
}

.hero {
  margin-top: 14px;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, #ffffff 0%, #f4f9ff 100%);
  border-radius: 22px;
  padding: 26px 26px 30px;
  box-shadow: 0 16px 38px rgba(18, 37, 66, 0.09);
}

.hero h1 {
  margin: 0;
  font-size: 52px;
  line-height: 1.03;
  letter-spacing: -0.04em;
  max-width: 830px;
}

.hero p {
  margin: 14px 0 0;
  color: #3a5271;
  font-size: 18px;
  max-width: 760px;
}

.cta-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.btn {
  border-radius: 11px;
  border: 1px solid #c6d8ef;
  background: #fff;
  color: #173553;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn.primary {
  background: linear-gradient(180deg, #0b71d8 0%, #005db7 100%);
  border-color: #0a63bb;
  color: #fff;
}

.btn:hover {
  text-decoration: none;
}

.grid {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  padding: 14px;
}

.card h3 {
  margin: 0;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.card p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.section {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  padding: 16px;
}

.section h2 {
  margin: 0 0 8px;
  font-size: 24px;
  letter-spacing: -0.02em;
}

.section ul {
  margin: 8px 0 0 18px;
  padding: 0;
}

.section li {
  margin: 7px 0;
  color: #304863;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.chip {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  border: 1px solid #d7e4f5;
  background: #f3f8ff;
  color: #2d4866;
  padding: 5px 10px;
  margin-right: 8px;
  margin-bottom: 8px;
  font-size: 12px;
  font-weight: 700;
}

.note {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  background: #f6fbff;
  border: 1px solid #d8e7f9;
  color: #2f4867;
  font-size: 14px;
}

.note.ok {
  background: #f0fbf5;
  border-color: #ccead9;
  color: var(--ok);
}

.note.warn {
  background: #fff8f0;
  border-color: #f1e0c8;
  color: var(--warn);
}

.footer {
  margin-top: 20px;
  color: #60718c;
  font-size: 13px;
  padding-bottom: 16px;
}

.doc h1 {
  margin: 6px 0 4px;
  font-size: 38px;
  letter-spacing: -0.03em;
}

.doc h2 {
  margin: 18px 0 8px;
  font-size: 24px;
  letter-spacing: -0.02em;
}

.doc p,
.doc li {
  color: #314861;
  line-height: 1.56;
}

.doc ul {
  margin-top: 7px;
}

.doc .doc-meta {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 940px) {
  .hero h1 {
    font-size: 42px;
  }
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 700px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero {
    padding: 20px;
  }
  .hero h1 {
    font-size: 34px;
  }
  .hero p {
    font-size: 16px;
  }
  .grid {
    grid-template-columns: 1fr;
  }
}