:root {
  --course-void: #07090c;
  --course-surface: #10141a;
  --course-raised: #171c23;
  --course-ink: #f0f1ee;
  --course-muted: #a3aab3;
  --course-dim: #68717d;
  --course-accent: #d8bd76;
  --course-accent-strong: #e6cf91;
  --course-border: rgba(240, 241, 238, 0.1);
  --course-danger: #d9796e;
  --course-success: #7dbb91;
  --course-radius: 16px;
  --course-ease: cubic-bezier(.16, 1, .3, 1);
}

body.column-course-shell {
  min-height: 100dvh;
  color: var(--course-ink);
  background: var(--course-void);
}

body.column-course-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .028;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.76' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.8'/%3E%3C/svg%3E");
}

.column-course-shell .site-header,
.course-site-main,
.column-course-shell .footer,
.course-study-header {
  position: relative;
  z-index: 2;
}

/* The legacy system-course hero used an overlay header. Once the course
   switcher exists, both navigation rows must participate in normal flow so
   they cannot paint over each other at tablet and mobile breakpoints. */
.course-page-body .site-header {
  position: relative;
}

.course-page-body .course-subnav {
  position: relative;
  z-index: 19;
}

.course-subnav {
  width: fit-content;
  max-width: calc(100% - 48px);
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(28px, 3vw, 44px);
  margin: 0 auto;
  padding: 0 18px;
  border: 0;
  background: transparent;
}

.course-subnav::before { display: none; }

.course-subnav a {
  position: relative;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  padding: 0 2px;
  border-radius: 0;
  color: var(--course-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 680;
  letter-spacing: .015em;
  transition: color .25s var(--course-ease), background .25s var(--course-ease);
}

.course-subnav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 3px;
  left: 0;
  height: 2px;
  background: var(--course-accent);
  opacity: 0;
  transform: scaleX(.35);
  transform-origin: center;
  transition: opacity .25s var(--course-ease), transform .25s var(--course-ease);
}

.course-subnav a:hover,
.course-subnav a:focus-visible {
  color: var(--course-ink);
  background: transparent;
}

.course-subnav a[aria-current="page"] {
  color: var(--course-accent-strong);
  background: transparent;
}

.course-subnav a[aria-current="page"]::after {
  opacity: 1;
  transform: scaleX(1);
}

.course-site-main { min-height: calc(100dvh - 180px); }
.course-container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

.course-catalog-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, .78fr);
  gap: clamp(56px, 8vw, 112px);
  align-items: start;
  padding: 72px 0 58px;
  border-bottom: 1px solid var(--course-border);
}

.course-catalog-heading .eyebrow {
  margin: 0 0 18px;
  color: var(--course-muted);
  letter-spacing: .13em;
}

.course-catalog-intro h1,
.course-detail-copy h1 {
  margin: 0;
  max-width: 820px;
  font-size: clamp(52px, 6vw, 78px);
  line-height: 1;
  letter-spacing: -.045em;
}

.course-catalog-intro h1 {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .16em;
}

.course-title-accent { color: var(--course-accent-strong); }

.course-catalog-overview {
  padding: 8px 0 8px 34px;
  border-left: 1px solid rgba(216, 189, 118, .34);
}

.course-catalog-intro .course-catalog-tagline {
  margin: 0;
  max-width: 460px;
  color: var(--course-ink);
  font-size: clamp(24px, 2.25vw, 30px);
  font-weight: 760;
  line-height: 1.3;
  letter-spacing: -.025em;
}

.course-catalog-tagline span { display: block; }

.course-catalog-intro .course-catalog-description,
.course-detail-copy > p {
  margin: 18px 0 0;
  max-width: 720px;
  color: var(--course-muted);
  font-size: 15px;
  line-height: 1.75;
  text-wrap: pretty;
}

.course-catalog-benefits {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding-top: 18px;
  padding-left: 0;
  border-top: 1px solid var(--course-border);
  color: var(--course-muted);
  font-size: 12px;
  font-weight: 650;
  list-style: none;
}

.course-catalog-benefits li::before {
  content: "";
  width: 5px;
  height: 5px;
  display: inline-block;
  margin: 0 8px 2px 0;
  border-radius: 50%;
  background: var(--course-accent);
}

.course-catalog-intro .course-catalog-release {
  margin: 18px 0 0;
  color: var(--course-dim);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
}

.course-catalog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; padding: 38px 0 100px; }
.course-card {
  min-height: 470px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--course-border);
  border-radius: var(--course-radius);
  background: var(--course-surface);
  box-shadow: 0 24px 70px rgba(2, 4, 8, .28);
  transition: transform .35s var(--course-ease), border-color .35s var(--course-ease);
}
.course-card:hover { transform: translateY(-4px); border-color: rgba(216, 189, 118, .38); }
.course-card-cover { aspect-ratio: 16 / 9; overflow: hidden; background: linear-gradient(145deg, #181d24, #0b0e12); }
.course-card-cover img { width: 100%; height: 100%; object-fit: cover; transition: transform .55s var(--course-ease); }
.course-card:hover .course-card-cover img { transform: scale(1.025); }
.course-card-body { flex: 1; display: flex; flex-direction: column; padding: 24px; }
.course-card-meta { display: flex; justify-content: space-between; gap: 16px; color: var(--course-dim); font-size: 12px; }
.course-card h2 { margin: 18px 0 8px; font-size: 26px; letter-spacing: -.025em; text-wrap: balance; }
.course-card p { margin: 0; color: var(--course-muted); line-height: 1.65; text-wrap: pretty; }
.course-card-bottom { margin-top: auto; padding-top: 28px; display: flex; align-items: end; justify-content: space-between; gap: 20px; }
.course-price strong { display: block; font-size: 28px; font-variant-numeric: tabular-nums; }
.course-price s { color: var(--course-dim); font-size: 13px; }

.course-action,
.course-action-secondary,
.course-icon-action {
  min-height: 44px;
  border-radius: 999px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 20px;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform .25s var(--course-ease), background .25s var(--course-ease), border-color .25s var(--course-ease);
}
.course-action { color: #15130d; background: var(--course-accent); }
.course-action:hover { transform: translateY(-2px); background: var(--course-accent-strong); }
.course-action-secondary { color: var(--course-ink); border-color: var(--course-border); background: rgba(240, 241, 238, .03); }
.course-action-secondary:hover { border-color: rgba(216, 189, 118, .42); background: rgba(216, 189, 118, .08); }
.course-action:disabled, .course-action-secondary:disabled { opacity: .5; cursor: not-allowed; transform: none; }

.course-empty,
.course-error-state {
  grid-column: 1 / -1;
  min-height: 360px;
  display: grid;
  place-items: center;
  padding: 48px;
  border: 1px dashed rgba(240, 241, 238, .15);
  border-radius: var(--course-radius);
  text-align: center;
  background: rgba(16, 20, 26, .54);
}
.course-empty i { width: 56px; height: 56px; display: grid; place-items: center; margin: 0 auto 20px; border: 1px solid rgba(216, 189, 118, .38); border-radius: 50%; color: var(--course-accent); font-style: normal; font-size: 24px; }
.course-empty h2, .course-error-state h2 { margin: 0; font-size: 28px; }
.course-empty p, .course-error-state p { max-width: 520px; margin: 12px auto 24px; color: var(--course-muted); line-height: 1.7; }

.course-skeleton { min-height: 470px; border: 1px solid var(--course-border); border-radius: var(--course-radius); background: linear-gradient(105deg, var(--course-surface) 30%, var(--course-raised) 48%, var(--course-surface) 66%); background-size: 240% 100%; animation: course-skeleton 1.4s linear infinite; }
@keyframes course-skeleton { to { background-position: -240% 0; } }

.course-detail-hero { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(360px, .9fr); gap: 70px; align-items: center; padding: 72px 0; }
.course-detail-loading { margin: 72px 0; }
.course-detail-cover { position: relative; aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid var(--course-border); border-radius: var(--course-radius); background: var(--course-surface); }
.course-detail-cover img { width: 100%; height: 100%; object-fit: cover; }
.course-detail-cover button { position: absolute; inset: 0; margin: auto; width: 76px; height: 76px; padding: 0; border-radius: 50%; color: #15130d; background: var(--course-accent); box-shadow: 0 16px 48px rgba(4, 5, 8, .45); }
.course-detail-copy h1 { font-size: clamp(46px, 5.2vw, 76px); }
.course-detail-meta { display: flex; flex-wrap: wrap; gap: 10px 20px; margin-top: 24px; color: var(--course-muted); font-size: 13px; }
.course-purchase-panel { margin-top: 34px; padding-top: 28px; border-top: 1px solid var(--course-border); }
.course-purchase-panel .course-price { margin-bottom: 20px; }
.course-purchase-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.course-trust-line { margin-top: 18px; color: var(--course-dim); font-size: 12px; line-height: 1.7; }

.course-detail-section { padding: 58px 0; border-top: 1px solid var(--course-border); }
.course-detail-section h2 { margin: 0 0 24px; font-size: clamp(30px, 4vw, 48px); letter-spacing: -.03em; }
.course-description { max-width: 800px; color: var(--course-muted); font-size: 16px; line-height: 1.9; white-space: pre-wrap; }
.course-lesson-list { display: grid; gap: 10px; }
.course-lesson-row { min-height: 74px; display: grid; grid-template-columns: 48px minmax(0, 1fr) auto; align-items: center; gap: 16px; padding: 12px 18px; border: 1px solid var(--course-border); border-radius: 12px; background: var(--course-surface); }
.course-lesson-row > span:first-child { color: var(--course-dim); font-variant-numeric: tabular-nums; }
.course-lesson-row strong { display: block; }
.course-lesson-row small { color: var(--course-muted); }
.course-preview-badge { padding: 4px 8px; border-radius: 999px; color: #17130b; background: var(--course-accent); font-size: 11px; font-style: normal; }

.course-dialog { width: min(900px, calc(100% - 32px)); padding: 0; border: 1px solid var(--course-border); border-radius: var(--course-radius); color: var(--course-ink); background: var(--course-void); box-shadow: 0 34px 120px rgba(2, 4, 8, .78); }
.course-dialog::backdrop { background: rgba(5, 7, 10, .78); backdrop-filter: blur(10px); }
.course-dialog-header { min-height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 12px 18px; border-bottom: 1px solid var(--course-border); }
.course-dialog-header h2 { margin: 0; font-size: 18px; }
.course-icon-action { width: 44px; padding: 0; color: var(--course-ink); border-color: var(--course-border); background: transparent; font-size: 20px; }
.course-preview-player { display: block; width: 100%; aspect-ratio: 16 / 9; background: #05070a; }

.course-checkout-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); gap: 26px; padding: 70px 0 100px; }
.course-panel { border: 1px solid var(--course-border); border-radius: var(--course-radius); background: var(--course-surface); }
.course-panel-header { padding: 24px 26px; border-bottom: 1px solid var(--course-border); }
.course-panel-header h1, .course-panel-header h2 { margin: 0; font-size: 24px; letter-spacing: -.02em; }
.course-panel-body { padding: 26px; }
.checkout-course { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 22px; align-items: center; }
.checkout-course img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 10px; background: var(--course-raised); }
.checkout-course h2 { margin: 0 0 8px; }
.checkout-course p { margin: 0; color: var(--course-muted); }
.checkout-facts { display: grid; gap: 0; margin-top: 28px; }
.checkout-facts div { min-height: 50px; display: flex; justify-content: space-between; gap: 20px; align-items: center; border-top: 1px solid var(--course-border); }
.checkout-facts span { color: var(--course-muted); }
.checkout-summary { position: sticky; top: 100px; align-self: start; }
.checkout-total { display: flex; justify-content: space-between; align-items: end; gap: 16px; margin-bottom: 22px; }
.checkout-total span { color: var(--course-muted); }
.checkout-total strong { font-size: 34px; font-variant-numeric: tabular-nums; }
.checkout-lock { display: flex; gap: 10px; padding: 13px 14px; border-radius: 10px; color: var(--course-muted); background: rgba(216, 189, 118, .08); }
.checkout-summary .course-action { width: 100%; margin-top: 20px; }
.course-consent { display: flex; gap: 10px; margin-top: 16px; color: var(--course-muted); font-size: 12px; line-height: 1.6; }
.course-consent input { width: 18px; height: 18px; margin-top: 1px; accent-color: var(--course-accent); }

.course-account-head { display: flex; justify-content: space-between; gap: 30px; align-items: end; padding: 68px 0 32px; }
.course-account-head h1 { margin: 0; font-size: clamp(42px, 6vw, 70px); letter-spacing: -.04em; }
.course-account-head p { margin: 10px 0 0; color: var(--course-muted); }
.course-account-tabs { display: flex; gap: 6px; padding-bottom: 16px; border-bottom: 1px solid var(--course-border); overflow-x: auto; }
.course-account-tabs button { min-height: 44px; padding: 0 16px; border: 0; border-radius: 999px; color: var(--course-muted); background: transparent; font: inherit; font-weight: 650; white-space: nowrap; cursor: pointer; }
.course-account-tabs button[aria-selected="true"] { color: #15130d; background: var(--course-accent); }
.course-account-view { padding: 26px 0 100px; }
.course-library-list { display: grid; gap: 14px; }
.owned-course { display: grid; grid-template-columns: 220px minmax(0, 1fr) auto; gap: 24px; align-items: center; padding: 16px; border: 1px solid var(--course-border); border-radius: var(--course-radius); background: var(--course-surface); }
.owned-course img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: 10px; background: var(--course-raised); }
.owned-course h2 { margin: 0 0 8px; font-size: 23px; }
.owned-course p { margin: 0; color: var(--course-muted); }
.course-progress { height: 4px; margin-top: 18px; overflow: hidden; border-radius: 999px; background: rgba(240, 241, 238, .08); }
.course-progress i { display: block; height: 100%; background: var(--course-accent); }

.course-table { overflow: hidden; border: 1px solid var(--course-border); border-radius: var(--course-radius); background: var(--course-surface); }
.course-table-row { min-height: 56px; display: grid; grid-template-columns: minmax(180px, 1.4fr) 130px 120px 140px minmax(120px, .8fr); align-items: center; gap: 12px; padding: 8px 18px; border-top: 1px solid var(--course-border); }
.course-table-row:first-child { border-top: 0; }
.course-table-row.course-table-head { min-height: 44px; color: var(--course-dim); font-size: 12px; background: rgba(240, 241, 238, .025); }
.course-table-row > :nth-child(2), .course-table-row > :nth-child(3) { font-variant-numeric: tabular-nums; text-align: right; }
.course-status { display: inline-flex; align-items: center; gap: 7px; color: var(--course-muted); }
.course-status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--course-dim); }
.course-status.paid::before, .course-status.refunded::before { background: var(--course-success); }
.course-status.pending::before, .course-status.refund_frozen::before { background: var(--course-accent); }
.course-inline-button { min-height: 36px; border: 1px solid var(--course-border); border-radius: 999px; padding: 0 12px; color: var(--course-ink); background: transparent; cursor: pointer; }

.course-result { min-height: calc(100dvh - 180px); display: grid; place-items: center; padding: 48px 24px; }
.course-result-card { width: min(540px, 100%); padding: 42px; border: 1px solid var(--course-border); border-radius: var(--course-radius); text-align: center; background: var(--course-surface); }
.course-result-icon { width: 62px; height: 62px; display: grid; place-items: center; margin: 0 auto 22px; border-radius: 50%; color: var(--course-accent); border: 1px solid rgba(216, 189, 118, .38); font-size: 28px; }
.course-result-card h1 { margin: 0; font-size: 32px; }
.course-result-card p { margin: 12px auto 26px; color: var(--course-muted); line-height: 1.7; }

.course-player-body { margin: 0; min-height: 100dvh; overflow: hidden; color: var(--course-ink); background: #07090c; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif; }
.course-study-header { height: 62px; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 18px; align-items: center; padding: 0 18px; border-bottom: 1px solid var(--course-border); background: rgba(7, 9, 12, .96); }
.course-study-brand { min-height: 44px; display: flex; align-items: center; gap: 10px; color: var(--course-ink); text-decoration: none; }
.course-study-brand img { width: 30px; height: 30px; object-fit: contain; }
.course-study-title { min-width: 0; }
.course-study-title strong, .course-study-title small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.course-study-title small { margin-top: 2px; color: var(--course-dim); }
.course-player-shell { height: calc(100dvh - 62px); display: grid; grid-template-columns: minmax(0, 1fr) 340px; }
.course-video-stage { position: relative; min-width: 0; display: grid; place-items: center; padding: 22px; background: #05070a; }
.course-video-stage video { width: 100%; max-height: calc(100dvh - 106px); aspect-ratio: 16 / 9; background: #05070a; }
.course-watermark { position: absolute; z-index: 4; pointer-events: none; color: rgba(240, 241, 238, .34); font-size: 12px; letter-spacing: .04em; text-shadow: 0 1px 2px rgba(5, 7, 10, .8); animation: watermark-drift 38s var(--course-ease) infinite alternate; }
@keyframes watermark-drift { 0% { transform: translate(-28vw, -20vh); } 50% { transform: translate(22vw, 8vh); } 100% { transform: translate(-6vw, 22vh); } }
.course-player-sidebar { overflow-y: auto; border-left: 1px solid var(--course-border); background: var(--course-surface); }
.course-player-sidebar header { position: sticky; top: 0; z-index: 2; padding: 20px; border-bottom: 1px solid var(--course-border); background: rgba(16, 20, 26, .96); }
.course-player-sidebar h2 { margin: 0; font-size: 18px; }
.course-player-sidebar select { width: 100%; min-height: 44px; margin-top: 14px; padding: 0 12px; border: 1px solid var(--course-border); border-radius: 10px; color: var(--course-ink); background: var(--course-raised); }
.course-player-lessons { display: grid; }
.course-player-lesson { min-height: 68px; display: grid; grid-template-columns: 28px minmax(0, 1fr) auto; gap: 10px; align-items: center; padding: 10px 16px; border: 0; border-bottom: 1px solid var(--course-border); color: var(--course-muted); background: transparent; text-align: left; cursor: pointer; }
.course-player-lesson:hover, .course-player-lesson[aria-current="true"] { color: var(--course-ink); background: rgba(216, 189, 118, .08); }
.course-player-lesson:disabled { opacity: .5; cursor: not-allowed; }
.course-player-lesson span:first-child { color: var(--course-dim); font-variant-numeric: tabular-nums; }
.course-player-error { max-width: 520px; padding: 34px; border: 1px solid var(--course-border); border-radius: var(--course-radius); text-align: center; background: var(--course-surface); }
.course-player-error h1 { margin: 0; font-size: 26px; }
.course-player-error p { color: var(--course-muted); }

.course-toast { position: fixed; right: 18px; bottom: 18px; z-index: 50; max-width: min(420px, calc(100% - 36px)); padding: 14px 16px; border: 1px solid var(--course-border); border-radius: 12px; color: var(--course-ink); background: var(--course-raised); box-shadow: 0 18px 55px rgba(2, 4, 8, .52); }
.course-toast[data-kind="error"] { border-color: rgba(217, 121, 110, .45); }

:where(.course-action, .course-action-secondary, .course-icon-action, .course-account-tabs button, .course-inline-button, .course-player-lesson, .course-subnav a):focus-visible { outline: 2px solid var(--course-accent); outline-offset: 3px; }

@media (max-width: 900px) {
  .course-catalog-intro, .course-detail-hero, .course-checkout-layout { grid-template-columns: 1fr; gap: 34px; }
  .course-catalog-intro { padding-top: 58px; }
  .course-catalog-overview {
    max-width: 680px;
    padding: 28px 0 0;
    border-top: 1px solid rgba(216, 189, 118, .34);
    border-left: 0;
  }
  .course-detail-copy { order: -1; }
  .checkout-summary { position: static; }
  .owned-course { grid-template-columns: 160px minmax(0, 1fr); }
  .owned-course > .course-action { grid-column: 1 / -1; }
  .course-table { border: 0; background: transparent; display: grid; gap: 12px; }
  .course-table-row { grid-template-columns: 1fr 1fr; gap: 8px; padding: 16px; border: 1px solid var(--course-border); border-radius: 12px; background: var(--course-surface); }
  .course-table-row.course-table-head { display: none; }
  .course-table-row > * { text-align: left !important; }
  .course-player-shell { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) 260px; }
  .course-player-sidebar { border-left: 0; border-top: 1px solid var(--course-border); }
  .course-video-stage video { max-height: calc(100dvh - 366px); }
}

@media (max-width: 620px) {
  .course-container { width: min(100% - 28px, 1180px); }
  .course-subnav {
    width: auto;
    max-width: none;
    gap: 24px;
    justify-content: flex-start;
    margin: 0 14px;
    padding: 0;
    overflow-x: auto;
  }
  .course-subnav a { flex: 0 0 auto; }
  .course-catalog-intro h1, .course-detail-copy h1 { font-size: clamp(42px, 12vw, 62px); }
  .course-catalog-grid { grid-template-columns: 1fr; }
  .course-empty { padding: 32px 20px; }
  .course-detail-hero { padding: 46px 0; }
  .course-purchase-actions > * { width: 100%; }
  .checkout-course { grid-template-columns: 1fr; }
  .course-account-head { display: block; }
  .owned-course { grid-template-columns: 1fr; }
  .course-study-header { grid-template-columns: auto minmax(0, 1fr); }
  .course-study-header > .course-action-secondary { display: none; }
  .course-video-stage { padding: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .course-card, .course-card-cover img, .course-action, .course-action-secondary { transition: none !important; }
  .course-card:hover, .course-action:hover { transform: none; }
  .course-skeleton, .course-watermark { animation: none !important; }
  .course-watermark { transform: translate(12vw, -12vh); }
}