:root {
  --bg: #f7f4ee;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #52606d;
  --line: #d9e2ec;
  --primary: #2f6fb3;
  --primary-dark: #1f4f82;
  --triangle: #4c9ed9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Noto Sans", sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #fbfaf7 0%, var(--bg) 100%);
}

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(31, 41, 51, 0.06);
}

.brand {
  display: inline-grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  align-items: center;
}

.brand-mark {
  width: 72px;
  height: 72px;
  border-radius: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
}

.mark {
  width: 44px;
  height: 44px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 20px 24px;
}

.mark-top {
  grid-column: 1 / span 2;
  background: var(--triangle);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.mark-left {
  background: var(--primary);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

.mark-right {
  background: var(--primary-dark);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
}

h1,
h2,
h3 {
  margin: 0 0 12px;
  line-height: 1.2;
}

p,
li {
  line-height: 1.6;
  color: var(--text);
}

.muted {
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}

a {
  color: var(--primary-dark);
}

code {
  background: #eef4fb;
  border-radius: 6px;
  padding: 1px 5px;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

.notice {
  border-left: 4px solid var(--triangle);
  background: #f4f9fd;
  padding: 12px 14px;
  border-radius: 10px;
}

@media (max-width: 640px) {
  .brand {
    grid-template-columns: 1fr;
  }
}