:root {
  --primary: #1f4d63;
  --bg: #eef3f6;
  --surface: #ffffff;
  --accent: #3d7a8c;
  --text: #15232c;
  --muted: #5a6b75;
  --radius: 18px;
  --card-radius: 22px;
  --shadow: 0 22px 52px rgba(21, 45, 58, 0.08);
  --shadow-soft: 0 12px 32px rgba(15, 23, 42, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Helvetica Neue", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(100%, 1240px);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  background: color-mix(in srgb, var(--bg) 90%, white);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--primary) 10%, transparent);
}

.site-header-inner {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 20px;
  min-height: 78px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.01em;
  text-decoration: none;
}

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

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: #fff;
  font-weight: 900;
  background: linear-gradient(135deg, #3d7a8c, #1f4d63);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 22px;
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

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

main {
  padding-top: 28px;
}

.section-heading {
  margin: 0 0 8px;
}

.section-heading h2 {
  margin: 0;
  font-size: 24px;
  line-height: 1.6;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.content-card {
  margin: 24px 0;
  padding: 29px;
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--primary) 12%, transparent);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow);
}

.content-card > h2:first-child {
  margin-top: 0;
}

.content-card h2 {
  margin: 0 0 16px;
  font-size: 1.5rem;
  font-weight: 800;
}

.content-card h3 {
  margin: 22px 0 10px;
  font-size: 1.05rem;
  font-weight: 800;
}

.content-card p {
  margin: 0 0 14px;
  color: color-mix(in srgb, var(--text) 88%, transparent);
}

.content-card ul {
  margin: 0 0 14px;
  padding-left: 1.25rem;
  color: color-mix(in srgb, var(--text) 88%, transparent);
}

.content-card li + li {
  margin-top: 6px;
}

.page-block {
  padding: 10px 0 18px;
}

.guide-grid {
  display: grid;
  gap: 16px;
}

.guide-card {
  display: grid;
  gap: 8px;
  padding: 18px;
  background: color-mix(in srgb, var(--surface) 92%, white);
  border: 1px solid color-mix(in srgb, var(--primary) 10%, transparent);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-soft);
  color: var(--text);
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.guide-card:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.1);
}

.guide-card strong {
  font-size: 1.05rem;
}

.guide-card span {
  color: var(--muted);
  font-size: 0.95rem;
}

.hero {
  padding: 18px 0 8px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  line-height: 1.25;
}

.hero p {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

.footer {
  margin-top: 56px;
  padding: 40px 0;
  background: color-mix(in srgb, var(--bg) 84%, white);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  border-top: 1px solid color-mix(in srgb, var(--primary) 8%, transparent);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr auto;
  gap: 24px;
  align-items: start;
}

.footer__brand strong {
  display: block;
  color: var(--text);
  margin-bottom: 8px;
}

.footer__brand p {
  margin: 0;
  max-width: 52ch;
}

.footer__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 22px;
  justify-content: flex-end;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 13px;
}

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

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

@media (max-width: 800px) {
  .site-header-inner,
  .footer-inner {
    grid-template-columns: 1fr;
  }

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

  .content-card {
    padding: 22px;
  }
}