:root {
  color-scheme: light;
  --ink: #07162f;
  --muted: #5b6b82;
  --line: rgba(7, 22, 47, 0.1);
  --mint: #55dece;
  --gold: #ffdc6a;
  --blue: #3f7cff;
  --panel: rgba(255, 255, 255, 0.82);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 15%, rgba(85, 222, 206, 0.28), transparent 30%),
    radial-gradient(circle at 85% 5%, rgba(255, 220, 106, 0.25), transparent 24%),
    #f4f8fb;
}
a { color: inherit; text-decoration: none; }
.site-header {
  width: min(1200px, calc(100% - 32px));
  margin: 18px auto 0;
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--mint), var(--gold));
  font-weight: 900;
}
.brand strong { display: block; font-size: 20px; }
.brand small { display: block; color: var(--muted); margin-top: 2px; }
nav { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
nav a, .btn {
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}
nav a { color: #34445c; }
main { width: min(1200px, calc(100% - 32px)); margin: 18px auto 0; }
.hero, .course-card, .content-section, .price-grid article {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 22px 60px rgba(38, 84, 118, 0.12);
}
.hero {
  border-radius: 30px;
  padding: clamp(26px, 5vw, 56px);
  margin-bottom: 20px;
}
.split, .course-hero, .columns {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 24px;
  align-items: center;
}
.course-hero img, .course-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 22px;
}
.eyebrow {
  margin: 0 0 12px;
  color: #008d82;
  font-weight: 900;
}
h1 {
  margin: 0;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.06;
  letter-spacing: 0;
}
h2 { margin: 0 0 12px; font-size: clamp(24px, 3vw, 34px); }
p {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn.primary { background: linear-gradient(135deg, var(--mint), #23c7b8); color: #031b24; }
.btn.secondary { background: white; border: 1px solid var(--line); color: #1d2d44; }
.hero-panel {
  padding: 26px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(85, 222, 206, 0.16), rgba(255, 220, 106, 0.18));
}
.course-list { display: grid; gap: 16px; }
.course-card {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 22px;
  padding: 18px;
  border-radius: 26px;
}
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.tag-row span {
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(85, 222, 206, 0.18);
  color: #006d66;
  font-weight: 800;
}
.text-link { color: #006d66; font-weight: 900; }
.content-section {
  border-radius: 26px;
  padding: clamp(22px, 4vw, 36px);
  margin-bottom: 20px;
}
.episode-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.episode-list li {
  display: flex;
  gap: 12px;
  padding: 16px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(85, 222, 206, 0.12), rgba(255, 220, 106, 0.16));
}
.episode-list span {
  width: 42px;
  height: 42px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  background: var(--gold);
  font-weight: 900;
}
.episode-list strong { display: block; font-size: 17px; }
.episode-list p { margin: 4px 0 0; font-size: 14px; line-height: 1.55; }
.price-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}
.price-grid article {
  border-radius: 24px;
  padding: 24px;
}
.price-grid span { color: #008d82; font-weight: 900; }
.price-grid strong { display: block; margin-top: 10px; font-size: 36px; }
.legal-hero { padding-block: 42px; }
.site-footer {
  width: min(1200px, calc(100% - 32px));
  margin: 30px auto;
  padding: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  color: var(--muted);
}
@media (max-width: 860px) {
  .site-header { align-items: flex-start; flex-direction: column; }
  nav { justify-content: flex-start; }
  .split, .course-hero, .columns, .course-card { grid-template-columns: 1fr; }
  .episode-list, .price-grid { grid-template-columns: 1fr; }
  .hero { border-radius: 24px; }
}