:root {
  --bg: #f4f7f4;
  --surface: #ffffff;
  --text: #16302b;
  --muted: #58716a;
  --line: #d9e5df;
  --accent: #0d9488;
  --accent-dark: #0b6e66;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: linear-gradient(180deg, #eef7f4 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.65;
}

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

.shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 72px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 18px 48px rgba(18, 61, 54, 0.08);
  overflow: hidden;
}

.hero {
  padding: 32px 32px 20px;
  background: radial-gradient(circle at top right, rgba(13, 148, 136, 0.16), transparent 38%), #fcfefd;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 10px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(13, 148, 136, 0.12);
  color: var(--accent-dark);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(32px, 4vw, 44px);
  line-height: 1.1;
}

h2 {
  margin: 0 0 12px;
  font-size: 24px;
}

h3 {
  margin: 24px 0 8px;
  font-size: 18px;
}

.subtitle,
.meta,
.footer-note {
  color: var(--muted);
}

.meta {
  margin-top: 8px;
  font-size: 14px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.nav a {
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 999px;
  background: #f0f8f6;
  border: 1px solid #d6ebe5;
  color: var(--accent-dark);
  font-weight: 600;
}

.content {
  padding: 28px 32px 36px;
}

.content section + section {
  margin-top: 26px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

ul {
  margin: 10px 0 0;
  padding-left: 20px;
}

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

.grid.two {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.panel {
  padding: 18px;
  background: #f8fbfa;
  border: 1px solid var(--line);
  border-radius: 16px;
}

.footer {
  padding: 22px 32px 28px;
  border-top: 1px solid var(--line);
  background: #fcfefd;
}

code {
  padding: 2px 6px;
  border-radius: 6px;
  background: #eef5f2;
}

@media (max-width: 640px) {
  .hero,
  .content,
  .footer {
    padding-left: 20px;
    padding-right: 20px;
  }
}