:root {
  --brand: #1f3a5f;
  --accent: #f2b84b;
  --ink: #1f2937;
  --muted: #64748b;
  --bg: #f7fafc;
  --card: #ffffff;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
}
.container {
  max-width: 90%;
  margin: auto;
  padding: 28px 18px;
}
.hero {
  background: linear-gradient(135deg, #1f3a5f, #315f9d);
  color: white;
  padding: 56px 18px;
}
.hero .container {
  padding-top: 0;
  padding-bottom: 0;
}
.badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  padding: 6px 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.hero h1 {
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.1;
  margin: 16px 0 12px;
}
.hero p {
  max-width: 760px;
  font-size: 18px;
  opacity: 0.94;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
  margin-top: 28px;
}
.card {
  background: var(--card);
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  padding: 22px;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.06);
}
.card h2,
.card h3 {
  margin: 0 0 10px;
}
.code {
  font-weight: 800;
  color: var(--brand);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.btn {
  display: inline-block;
  margin-top: 12px;
  background: #1f6306;
  color: white;
  text-decoration: none;
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 700;
}
.btn:hover {
  filter: brightness(1.08);
}
.course-header {
  background: white;
  border-bottom: 1px solid #e5e7eb;
}
.course-title {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
}
.course-title h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.15;
  margin: 10px 0;
}
.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 20px 0;
}
.meta div {
  background: #eff6ff;
  border-left: 4px solid var(--brand);
  padding: 14px;
  border-radius: 12px;
}
.section {
  background: white;
  border-radius: 18px;
  padding: 26px;
  margin: 20px 0;
  border: 1px solid #e5e7eb;
}
.section h2 {
  color: var(--brand);
  margin-top: 0;
}
.lead {
  font-size: 18px;
  color: #334155;
}
.points {
  padding-left: 20px;
}
.points li {
  margin: 8px 0;
}
.quote {
  border-left: 5px solid var(--accent);
  padding: 12px 18px;
  background: #fff8e7;
  border-radius: 0 12px 12px 0;
  font-weight: 700;
}
.footer {
  padding: 30px 18px;
  color: var(--muted);
  text-align: center;
}
.nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}
.nav a {
  color: var(--brand);
  font-weight: 700;
  text-decoration: none;
}
.notice {
  font-size: 14px;
  color: var(--muted);
}