:root {
  --primary: #01708e;
  --primary-dark: #001f28;
  --text: #111827;
  --text-secondary: #4b5563;
  --border: #e5e7eb;
  --bg-soft: #f9fafb;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

header {
  background: linear-gradient(100deg, var(--primary), var(--primary-dark));
  color: #ffffff;
  padding: 20px 24px;
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  font-size: 22px;
  font-weight: 700;
  color: #ffffff;
  text-decoration: none;
  letter-spacing: 0.2px;
}

nav a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  margin-left: 18px;
}

nav a:hover {
  color: #ffffff;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 64px;
}

h1 {
  font-size: 30px;
  line-height: 1.25;
  margin-bottom: 8px;
}

.updated {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 28px;
}

h2 {
  font-size: 19px;
  margin: 28px 0 10px;
}

p {
  margin-bottom: 12px;
  color: var(--text-secondary);
}

ul {
  margin: 0 0 12px 22px;
  color: var(--text-secondary);
}

li {
  margin-bottom: 6px;
}

strong {
  color: var(--text);
}

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

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 20px;
  margin-bottom: 14px;
}

.card h2 {
  margin-top: 0;
  font-size: 16px;
}

.card p:last-child {
  margin-bottom: 0;
}

.btn {
  display: inline-block;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  color: #ffffff;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  padding: 13px 26px;
  border-radius: 10px;
}

.hero {
  text-align: center;
  padding: 28px 0 12px;
}

.hero p {
  max-width: 540px;
  margin: 0 auto 24px;
  font-size: 17px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 36px;
  text-align: left;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
}

footer a {
  color: var(--text-secondary);
  margin: 0 8px;
}