/* ——— Страница курса: премиальный плеер в стиле HART ——— */

.page-course .wrap--course {
  max-width: 100%;
  padding-left: 0;
  padding-right: 0;
  padding-bottom: 0;
}

.page-course .site-header,
.page-course .breadcrumb {
  padding-left: clamp(1rem, 3vw, 2rem);
  padding-right: clamp(1rem, 3vw, 2rem);
}

/* Лендинг */
.course-landing {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem clamp(1rem, 3vw, 2rem) 2.5rem;
}

.course-landing--hero {
  position: relative;
  padding-bottom: 2.5rem;
  margin-bottom: 0;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--ambient-top) 0%, transparent 55%);
}

.course-landing--hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(420px, 50vw);
  height: 100%;
  background: radial-gradient(ellipse at 100% 0%, rgba(91, 159, 212, 0.12), transparent 70%);
  pointer-events: none;
}

.course-landing-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  border: 1px solid rgba(91, 159, 212, 0.45);
  padding: 0.35rem 0.75rem;
  margin-bottom: 1rem;
}

.course-landing--hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 600;
  line-height: 1.12;
  margin: 0 0 1.25rem;
  max-width: 18ch;
  color: var(--text);
}

.course-landing-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
}

.course-stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
}

.course-stat-pill strong {
  color: var(--gold-light);
  font-weight: 700;
}

.course-landing-desc {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  max-width: 640px;
  margin-bottom: 1.75rem;
}

.course-landing-outcomes {
  margin-top: 0.5rem;
}

.course-landing-outcomes h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--gold-light);
  margin-bottom: 1rem;
  font-weight: 600;
}

.course-outcomes-list {
  list-style: none;
  display: grid;
  gap: 0.65rem;
  max-width: 720px;
}

.course-outcomes-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.92rem;
  line-height: 1.5;
  color: var(--text);
}

.course-outcomes-list li::before {
  content: "";
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  margin-top: 0.55rem;
  background: var(--gold);
  transform: rotate(45deg);
}

.course-landing-cta {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.course-landing-cta .pay-hint {
  margin: 0;
}

/* Плеер */
#hart-player.course-section {
  margin: 0;
  padding: 0;
  background: transparent;
  border: none;
}

.learn-demo-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.5rem 1rem;
  padding: 0.85rem clamp(1rem, 3vw, 2rem);
  background: linear-gradient(90deg, rgba(91, 159, 212, 0.16), rgba(91, 159, 212, 0.04));
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text);
}

.learn-demo-banner a {
  color: var(--gold-light);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 213, 163, 0.4);
}

.learn-demo-banner a:hover {
  border-bottom-color: rgba(142, 197, 234, 0.5);
}

.learn-shell {
  display: grid;
  grid-template-columns: minmax(300px, 360px) 1fr;
  min-height: calc(100vh - 140px);
  background: var(--bg);
}

/* Сайдбар */
.learn-sidebar {
  border-right: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 80px);
  position: sticky;
  top: 0;
  align-self: start;
  z-index: 2;
}

.learn-sidebar-head {
  padding: 1.5rem 1.25rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--surface2) 0%, var(--surface) 100%);
}

.learn-sidebar-head h2 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--gold-light);
  margin: 0 0 1rem;
}

.learn-progress-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.learn-progress-ring {
  --pct: 0%;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: conic-gradient(var(--gold) var(--pct), rgba(26, 28, 35, 0.95) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 0 1px rgba(91, 159, 212, 0.25);
  transition: background 0.5s ease;
}

.learn-progress-ring span {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface);
  font-size: 0.68rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
  letter-spacing: -0.02em;
}

.learn-progress-text {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.45;
}

.learn-progress-text strong {
  display: block;
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.1rem;
}

.learn-curriculum {
  overflow-y: auto;
  flex: 1;
  padding: 0.35rem 0 1.25rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.learn-curriculum::-webkit-scrollbar {
  width: 6px;
}

.learn-curriculum::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.learn-section-title {
  padding: 1rem 1.25rem 0.4rem;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
  font-weight: 800;
}

.learn-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  width: calc(100% - 0.5rem);
  margin: 0 0.25rem 0.25rem 0.5rem;
  text-align: left;
  padding: 0.75rem 0.85rem;
  border: none;
  border-radius: 2px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.84rem;
  line-height: 1.45;
  border-left: 3px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.learn-item:hover {
  background: var(--gold-dim);
}

.learn-item.is-active {
  background: rgba(91, 159, 212, 0.12);
  border-left-color: var(--gold);
}

.learn-item.is-done .learn-item-check {
  background: rgba(111, 207, 151, 0.2);
  border-color: #6fcf97;
  color: #6fcf97;
}

.learn-item-num {
  flex-shrink: 0;
  width: 1.5rem;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--muted);
  text-align: right;
  padding-top: 0.35rem;
}

.learn-item.is-active .learn-item-num {
  color: var(--gold);
}

.learn-item-check {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
}

.learn-item-check svg {
  width: 0.85rem;
  height: 0.85rem;
  fill: currentColor;
}

.learn-item-body {
  flex: 1;
  min-width: 0;
  padding-top: 0.1rem;
}

.learn-item-title {
  display: block;
  font-weight: 600;
  color: var(--text);
}

.learn-item.is-active .learn-item-title {
  color: var(--gold-light);
}

.learn-item-meta {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.2rem;
}

/* Основная колонка */
.learn-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg);
}

.learn-video-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: min(58vh, 540px);
  background: #050505;
  overflow: hidden;
}

.learn-video-stage::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 80px rgba(0, 0, 0, 0.35);
}

.learn-video-stage.is-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(ellipse 80% 60% at 50% 20%, rgba(91, 159, 212, 0.1), transparent),
    linear-gradient(160deg, #141210 0%, #050505 100%);
}

.learn-video-placeholder {
  text-align: center;
  padding: 2.5rem;
  z-index: 1;
}

.learn-video-placeholder strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  color: var(--gold-light);
  margin-bottom: 0.65rem;
  font-weight: 600;
}

.learn-video-placeholder span {
  font-size: 0.9rem;
  color: var(--muted);
}

.learn-video-stage .lesson-video {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  height: 100%;
  border: none;
}

.learn-video-stage .lesson-video iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.learn-lesson-head {
  padding: 1.5rem clamp(1.25rem, 3vw, 2rem) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  border-bottom: 1px solid transparent;
}

.learn-lesson-kicker {
  width: 100%;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 -0.35rem;
}

.learn-lesson-head h1 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.5vw, 1.75rem);
  font-weight: 600;
  line-height: 1.25;
  margin: 0;
  flex: 1;
  min-width: min(100%, 280px);
  color: var(--text);
}

.learn-complete-btn {
  flex-shrink: 0;
  padding: 0.6rem 1.15rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid var(--gold);
  background: transparent;
  color: var(--gold);
  cursor: pointer;
  font-family: inherit;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.learn-complete-btn:hover {
  background: var(--gold-dim);
  color: var(--gold-light);
}

.learn-complete-btn.is-done {
  background: rgba(111, 207, 151, 0.12);
  border-color: #6fcf97;
  color: #8fdfac;
}

.learn-complete-btn:focus-visible,
.learn-tab:focus-visible,
.learn-item:focus-visible,
.learn-nav-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}

.learn-tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0 clamp(1rem, 3vw, 1.75rem);
  margin-top: 0.5rem;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}

.learn-tabs::-webkit-scrollbar {
  display: none;
}

.learn-tab {
  padding: 0.9rem 1.1rem;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  transition: color 0.2s, border-color 0.2s;
}

.learn-tab:hover {
  color: var(--text);
}

.learn-tab.is-active {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
}

.learn-panels {
  flex: 1;
  padding: 1.5rem clamp(1.25rem, 3vw, 2rem) 2rem;
  max-width: 820px;
}

.learn-panel {
  display: none;
}

.learn-panel.is-active {
  display: block;
  animation: learnPanelIn 0.4s ease;
}

@keyframes learnPanelIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.learn-main .lesson-summary {
  font-size: 1rem;
  line-height: 1.65;
}

.learn-main .lesson-points {
  margin-top: 1.25rem;
}

.learn-main .lesson-points li {
  margin: 0.65rem 0;
  padding-left: 0.25rem;
}

.learn-main .facts-list {
  gap: 0.85rem;
}

.learn-main .task-input {
  border-radius: 2px;
  font-size: 0.9rem;
  line-height: 1.5;
  transition: border-color 0.2s;
}

.learn-main .task-input:focus {
  outline: none;
  border-color: var(--gold);
}

.learn-resources {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.learn-resource-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, background 0.2s;
}

.learn-resource-card:hover {
  border-color: var(--gold);
  background: var(--gold-dim);
}

.learn-resource-card strong {
  display: block;
  color: var(--gold-light);
  font-size: 0.92rem;
  margin-bottom: 0.15rem;
}

.learn-resource-card span {
  font-size: 0.8rem;
  color: var(--muted);
}

.learn-resource-icon {
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
  flex-shrink: 0;
}

.learn-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--border);
  background: rgba(22, 22, 22, 0.92);
  backdrop-filter: blur(8px);
  margin-top: auto;
  position: sticky;
  bottom: 0;
  z-index: 3;
}

.learn-nav-btn {
  padding: 0.7rem 1.35rem;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  border-radius: var(--radius);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.learn-nav-btn:hover:not(:disabled) {
  border-color: var(--gold);
  color: var(--gold-light);
}

.learn-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.learn-nav-btn--primary {
  background: linear-gradient(180deg, #6eb0e3 0%, #4a8fc9 100%);
  border-color: rgba(91, 159, 212, 0.55);
  color: #0d1117;
  min-width: 140px;
  box-shadow: 0 2px 14px var(--accent-glow);
}

.learn-nav-btn--primary:hover:not(:disabled) {
  filter: brightness(1.06);
  color: #0a0a0a;
}

.learn-toggle-sidebar {
  display: none;
  position: fixed;
  bottom: 5.5rem;
  left: 1rem;
  z-index: 50;
  padding: 0.7rem 1.15rem;
  background: var(--gold);
  color: #0a0a0a;
  border: none;
  font-weight: 800;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45);
  border-radius: 2px;
}

.course-landing-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem clamp(1rem, 3vw, 2rem) 3rem;
  border-top: 1px solid var(--border);
}

.course-loading {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--muted);
}

.course-loading::after {
  content: "";
  display: block;
  width: 32px;
  height: 32px;
  margin: 1.25rem auto 0;
  border: 2px solid var(--border);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: learnSpin 0.8s linear infinite;
}

@keyframes learnSpin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 960px) {
  .learn-shell {
    grid-template-columns: 1fr;
  }

  .learn-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(340px, 90vw);
    z-index: 40;
    max-height: 100vh;
    transform: translateX(-105%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 8px 0 40px rgba(0, 0, 0, 0.5);
  }

  .learn-sidebar.is-open {
    transform: translateX(0);
  }

  .learn-toggle-sidebar {
    display: block;
  }

  .learn-sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    z-index: 35;
    backdrop-filter: blur(2px);
  }

  .learn-sidebar-backdrop.is-open {
    display: block;
  }

  .learn-video-stage {
    max-height: 42vh;
  }
}

.learn-main .quiz-wrap {
  margin-top: 0.5rem;
}

.learn-main .quiz-title {
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.learn-main .quiz-opt {
  border-radius: 2px;
  transition: border-color 0.2s, background 0.2s;
}

.learn-main .quiz-opt:hover:not(:disabled) {
  border-color: var(--gold);
}

.learn-main .quiz-opt.ok {
  border-color: #6fcf97;
  background: rgba(111, 207, 151, 0.1);
}

.learn-main .quiz-opt.bad {
  border-color: #c96a6a;
  background: rgba(201, 106, 106, 0.08);
}

@media (prefers-reduced-motion: reduce) {
  .learn-panel.is-active {
    animation: none;
  }

  .learn-item,
  .learn-progress-ring,
  .learn-nav-btn,
  .learn-complete-btn {
    transition: none;
  }
}