:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --line: #d6deea;
  --text: #152433;
  --muted: #4c6178;
  --accent: #0f6a8c;
  --accent-2: #1f7a5a;
  --radius: 16px;
  --shadow: 0 14px 30px rgba(17, 27, 44, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  line-height: 1.6;
  font-family: "Segoe UI", "Inter", "Poppins", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(circle at 0% 0%, #ffffff 0%, transparent 42%),
    radial-gradient(circle at 100% 0%, #e7eef8 0%, transparent 34%),
    var(--bg);
}

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

a:hover {
  text-decoration: underline;
}

header {
  position: sticky;
  top: 0;
  z-index: 80;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 246, 249, 0.92);
  backdrop-filter: blur(8px);
}

header nav {
  width: min(1080px, 92vw);
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.7rem;
  padding: 0.6rem 0;
  font-size: 0.94rem;
  font-weight: 600;
}

main {
  width: min(900px, 92vw);
  margin: 0 auto;
  padding: 1.5rem 0 2rem;
}

article,
main > section,
main > div {
  margin-bottom: 1rem;
}

article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(0.95rem, 2.5vw, 1.3rem);
}

h1 {
  margin: 0 0 0.55rem;
  font-size: clamp(1.65rem, 4.7vw, 2.55rem);
  line-height: 1.14;
}

h2 {
  margin: 1.05rem 0 0.45rem;
  font-size: clamp(1.08rem, 2.8vw, 1.45rem);
}

p,
li {
  color: #24364a;
}

ul,
ol {
  padding-left: 1.2rem;
}

footer {
  width: min(900px, 92vw);
  margin: 0 auto;
  padding: 0.8rem 0 1.7rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

@media (max-width: 700px) {
  body {
    line-height: 1.55;
  }

  header nav {
    font-size: 0.89rem;
  }

  main {
    padding-top: 1rem;
  }
}

@media (pointer: coarse) {
  header nav a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    padding-inline: 0.28rem;
  }

  a[href^="mailto:"] {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

@media (max-width: 460px) {
  header nav {
    gap: 0.3rem 0.5rem;
  }
}