:root {
  color-scheme: light;
  --bg: #f7f9fc;
  --surface: #ffffff;
  --text: #122033;
  --muted: #5c6b7a;
  --primary: #175cd3;
  --primary-hover: #1148a8;
  --border: #dbe3ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
}

.container {
  width: min(960px, 92%);
  margin: 0 auto;
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: var(--primary);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
}

.brand-title {
  font-weight: 700;
  font-size: 1.1rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-weight: 500;
}

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

main {
  padding: 52px 0;
}

.hero {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 28px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.2;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 700px;
}

.cta {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid var(--border);
}

.button.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.button.primary:hover {
  background: var(--primary-hover);
}

.button.secondary {
  color: var(--text);
  background: #fff;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 20px;
  margin-top: 18px;
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.doc h1 {
  margin: 0 0 14px;
}

.doc p,
.doc li {
  color: var(--muted);
}

.doc section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 14px;
}

footer {
  padding: 24px 0 34px;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    justify-content: center;
    padding: 12px 0;
  }
  nav a {
    margin: 0 10px;
  }
}