.courses-page .header-actions { gap: 32px; }
.courses-page .header-context { display: none; color: var(--muted); font-size: .875rem; }
.courses-page .explore-link { min-width: auto; padding-inline: 18px; font-size: .875rem; }

.course-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; padding: 38px 0 30px; }
.course-intro .eyebrow { margin-bottom: 16px; font-size: .75rem; letter-spacing: .14em; }
.courses-page h1 { font-size: clamp(2rem, 4.5vw, 3.25rem); line-height: 1.35; letter-spacing: -.045em; }
.intro-description { margin-top: 15px; color: var(--muted); font-size: 1rem; line-height: 1.8; }
.collection-stats { display: none; margin: 0 0 3px; gap: 34px; flex-shrink: 0; }
.collection-stats > div + div { padding-left: 34px; border-left: 1px solid var(--line); }
.collection-stats dt { color: var(--muted); font-size: .875rem; line-height: 1.5; }
.collection-stats dd { margin: 5px 0 0; font-family: Arial, sans-serif; font-size: 2.75rem; font-weight: 750; line-height: 1.1; letter-spacing: -.06em; }
.collection-stats dd > span { margin-left: 9px; font-family: "Microsoft YaHei", sans-serif; font-size: .875rem; font-weight: 400; color: var(--muted); letter-spacing: 0; }

.subject-nav { display: flex; flex-wrap: wrap; gap: 10px; padding: 0 0 28px; border-bottom: 1px solid var(--line); }
.subject-nav > a { display: inline-flex; align-items: center; gap: 10px; padding: 11px 15px; min-height: 44px; border: 1px solid #d7dce7; border-radius: 40px; background: var(--surface); font-size: .875rem; font-weight: 650; line-height: 1.5; transition: background 180ms ease, border-color 180ms ease, transform 180ms ease; }
.nav-index { color: var(--blue); font-family: Consolas, monospace; font-size: .75rem; }
.nav-count { padding-left: 10px; border-left: 1px solid var(--line); color: var(--muted); font-size: .875rem; font-weight: 400; white-space: nowrap; }
.subject-nav > a:active { transform: scale(.98); }

.course-section { padding: 30px 0 32px; scroll-margin-top: 24px; }
.course-section + .course-section { border-top: 1px solid var(--line); }
.course-heading { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 15px 24px; margin-bottom: 20px; }
.subject-heading { display: flex; align-items: center; gap: 14px; min-width: 0; }
.subject-icon { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 14px; flex-shrink: 0; }
.subject-icon .icon { width: 24px; height: 24px; }
.subject-icon-dark { color: #fff; background: var(--dark); }
.subject-icon-blue { color: #fff; background: var(--blue); }
.subject-icon-light { color: var(--blue); background: #e7ebff; border: 1px solid #d6deff; font-family: Georgia, serif; font-size: 2.25rem; line-height: 1; }
.subject-kicker { margin-bottom: 3px; color: var(--muted); font-family: Arial, sans-serif; font-size: .75rem; font-weight: 600; line-height: 1.5; letter-spacing: .09em; }
.subject-title { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.courses-page h2 { font-size: 1.375rem; line-height: 1.5; font-weight: 800; letter-spacing: -.025em; }
.courses-page .entry-count { font-family: Consolas, monospace; font-size: .75rem; }
.subject-description { color: var(--muted); font-size: .875rem; line-height: 1.6; }

.creator-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; }
.creator-card { display: flex; flex-direction: column; min-width: 0; min-height: 292px; padding: 22px; border: 1px solid #dfe2ec; border-radius: 16px; background: var(--surface); transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease; }
.creator-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 20px; }
.creator-mark { display: grid; place-items: center; flex-shrink: 0; width: 48px; height: 48px; border: 1px solid #e0e5fa; border-radius: 13px; background: #f0f3ff; color: var(--blue); font-size: .875rem; font-weight: 750; letter-spacing: -.025em; }
.creator-platform { color: var(--muted); font-size: .75rem; line-height: 1.5; }
.creator-card h3 { margin: 0 0 12px; font-size: 1.1875rem; line-height: 1.55; font-weight: 800; letter-spacing: -.025em; overflow-wrap: anywhere; }
.creator-tags { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 6px; margin-bottom: 15px; }
.creator-tags > span { padding: 3px 7px; border-radius: 5px; background: #f1f3f8; color: #546177; font-size: .875rem; line-height: 1.5; }
.creator-description { margin: 0 0 22px; color: var(--muted); font-size: 1rem; line-height: 1.75; }
.creator-link { display: flex; align-items: center; gap: 8px; margin-top: auto; padding-top: 15px; border-top: 1px solid #e9ecf3; color: var(--blue); font-size: .875rem; font-weight: 650; line-height: 1.6; }
.creator-link .icon { width: 19px; height: 19px; }
.creator-card-dark { background: var(--dark); border-color: var(--dark); color: #fff; }
.creator-card-blue { background: var(--blue); border-color: var(--blue); color: #fff; }
:is(.creator-card-dark, .creator-card-blue) .creator-mark { border-color: rgb(255 255 255 / .2); background: rgb(255 255 255 / .09); color: #fff; }
:is(.creator-card-dark, .creator-card-blue) .creator-platform { color: #e1e5f5; }
:is(.creator-card-dark, .creator-card-blue) .creator-tags > span { background: rgb(255 255 255 / .1); color: #f1f3ff; }
:is(.creator-card-dark, .creator-card-blue) .creator-description { color: #e1e5f5; }
:is(.creator-card-dark, .creator-card-blue) .creator-link { color: #fff; border-color: rgb(255 255 255 / .18); }
.creator-card:active { transform: translateY(-1px) scale(.985); }
.creator-card:focus-visible { outline-offset: 4px; }
.courses-page .site-footer { font-size: .875rem; padding-top: 24px; }

@media (hover: hover) {
  .subject-nav > a:hover { color: var(--blue); border-color: #aab6ed; background: #edf0ff; }
  .creator-card:hover { transform: translateY(-4px); box-shadow: 0 14px 30px -20px rgb(28 38 83 / .38); border-color: #b6c0f0; }
  .creator-card-dark:hover { border-color: #686f87; }
  .creator-card-blue:hover { border-color: #3453ff; }
  .creator-card:hover .creator-link { text-decoration: underline; text-underline-offset: 4px; }
  .creator-card:active { transform: translateY(-1px) scale(.985); }
}

@media (min-width: 600px) {
  .creator-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .creator-card { min-height: 330px; }
  .course-intro { padding-top: 44px; }
  .courses-page .header-context { display: block; }
}
@media (min-width: 900px) {
  .creator-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .collection-stats { display: flex; }
  .courses-page h1 { font-size: 2.75rem; }
}
@media (min-width: 1200px) {
  .creator-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .creator-card { min-height: 340px; padding: 22px 20px; }
  .courses-page h1 { font-size: 3.25rem; }
}
@media (max-width: 599px) {
  .course-intro { padding-top: 30px; }
  .course-intro h1 { max-width: 12em; }
  .course-intro h1 > span { display: block; }
  .subject-nav { gap: 8px; padding-bottom: 24px; }
  .subject-nav > a { gap: 7px; padding: 9px 12px; }
  .nav-count { display: none; }
  .course-section { padding: 24px 0 28px; }
  .subject-description { flex-basis: 100%; }
  .creator-top { margin-bottom: 16px; }
  .creator-card h3 { font-size: 1.25rem; }
}
@media (prefers-reduced-motion: reduce) {
  .courses-page * { transition: none !important; }
  .creator-card:hover, .creator-card:active, .subject-nav > a:active { transform: none; }
}