:root {
  --bg: #edf3f8;
  --paper: #ffffff;
  --ink: #102437;
  --muted: #4a5a68;
  --accent: #006a63;
  --accent-2: #0d3f8f;
  --accent-soft: #d8f4ee;
  --border: #d8e4ee;
  --radius: 16px;
  --shadow: 0 16px 32px rgba(16, 36, 55, 0.1);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  color: var(--ink);
  background:
    radial-gradient(circle at 8% -25%, #d9e7ff 0, transparent 40%),
    radial-gradient(circle at 98% -12%, #d3f4ea 0, transparent 42%),
    var(--bg);
  font-family: "Manrope", "Segoe UI", Arial, sans-serif;
  line-height: 1.5;
}

a {
  color: var(--accent-2);
}

.container {
  max-width: 1020px;
  margin: 0 auto;
  padding: 0 16px 28px;
}

.site-header {
  padding-top: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: 0.2px;
}

.brand-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #1ba08b);
}

.hero {
  margin-top: 14px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.hero h1 {
  margin: 0 0 10px;
  font-size: 34px;
  line-height: 1.2;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.menu-title {
  margin: 16px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--muted);
}

.menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.menu a {
  display: block;
  text-decoration: none;
  color: var(--accent);
  border: 1px solid #b9e6dc;
  background: var(--accent-soft);
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 700;
  transition: transform 0.15s ease;
}

.menu a:hover {
  transform: translateY(-1px);
}

.card {
  margin-top: 16px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-head {
  padding: 14px 16px 6px;
}

.card-head h2 {
  margin: 0;
  font-size: 24px;
  line-height: 1.25;
}

.card-head p {
  margin: 8px 0 0;
  color: var(--muted);
}

iframe {
  width: 100%;
  min-width: 320px;
  border: none;
  height: 680px;
}

.content {
  margin-top: 16px;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
}

.content h2 {
  margin: 20px 0 10px;
  font-size: 26px;
  line-height: 1.25;
}

.content h1 {
  margin: 0 0 12px;
  font-size: 32px;
  line-height: 1.2;
}

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

.content h3 {
  margin: 14px 0 8px;
  font-size: 20px;
}

.content p {
  margin: 0 0 10px;
}

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

.content ol {
  margin: 0 0 10px;
  padding-left: 22px;
}

.back {
  display: inline-block;
  margin-top: 10px;
  text-decoration: none;
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent), #158672);
  padding: 10px 14px;
  border-radius: 11px;
  font-weight: 700;
}

.related {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.related a {
  margin-right: 12px;
  white-space: nowrap;
}

.breadcrumbs {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumbs a {
  color: var(--accent-2);
  text-decoration: none;
}

.site-footer {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .hero h1 {
    font-size: 29px;
  }

  .hero p {
    font-size: 17px;
  }
}

@media (max-width: 700px) {
  .container {
    padding: 0 12px 22px;
  }

  .hero {
    padding: 14px;
  }

  .hero h1 {
    font-size: 24px;
  }

  .hero p {
    font-size: 16px;
  }

  .menu {
    grid-template-columns: 1fr;
  }

  .card-head h2 {
    font-size: 21px;
  }

  .content {
    padding: 14px;
  }

  .content h2 {
    font-size: 22px;
  }

  .content h1 {
    font-size: 26px;
  }

  .content h3 {
    font-size: 18px;
  }
}