:root {
  --course-bg: #07070c;
  --course-panel: #0f1020;
  --course-border: rgba(255, 255, 255, 0.08);
  --course-accent: #8b5cf6;
  --course-accent-soft: rgba(139, 92, 246, 0.18);
  --course-text: #f8f8ff;
  --course-text-muted: #b2b2ce;
  --course-surface: #11131f;
  --course-success: #10b981;
  --course-error: #fb7185;
}

.course-page {
  min-height: 100vh;
  padding: 26px 24px 40px;
  background: radial-gradient(circle at top, rgba(139, 92, 246, 0.12), transparent 36%), #050507;
}

.course-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.course-back-link,
.course-back-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--course-text);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 10px 14px;
  border-radius: 14px;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease;
}

.course-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: 999px;
  background: linear-gradient(90deg, #4f65d8, #6577f2);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  min-height: 42px;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.course-action-btn:hover {
  transform: translateY(-1px);
  background: linear-gradient(90deg, #5f72f2, #6f86ff);
  box-shadow: 0 14px 30px rgba(79, 101, 216, 0.18);
}

.course-action-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  background: rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  font-size: 0.95rem;
}

.course-back-link:hover,
.course-back-button:hover {
  transform: translateY(-1px);
  background: rgba(139, 92, 246, 0.12);
}

/* ===== INÍCIO BLOCO course-header ===== */
.course-header {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 18px;
  margin-bottom: 22px;
  padding: 7px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.22);
}
/* ===== FIM BLOCO course-header ===== */

.course-label {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.16);
  color: var(--course-accent);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.course-header h1 {
  font-size: clamp(1.6rem, 2.5vw, 2.4rem);
  margin-bottom: 10px;
  line-height: 1.1;
}

.course-description {
  color: var(--course-text-muted);
  max-width: 720px;
  line-height: 1.7;
}

.course-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.course-stat {
  padding: 24px;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
}

.course-stat span {
  display: block;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--course-text);
}

.course-stat p {
  margin-top: 8px;
  color: var(--course-text-muted);
}

.course-layout {
  display: grid;
  grid-template-columns: 1.7fr 1.1fr;
  gap: 24px;
}

.course-player-panel,
.course-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.player-card,
.course-summary-card,
.course-module {
  background: var(--course-panel);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 28px;
  padding: 24px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
}

.player-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 20px;
}

.player-label {
  display: block;
  color: var(--course-accent);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  margin-bottom: 10px;
}

.player-heading h2 {
  margin: 0;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
}

.player-meta {
  color: var(--course-text-muted);
  margin-top: 10px;
}

.player-frame {
  border-radius: 26px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  min-height: 360px;
}

.player-frame iframe {
  width: 100%;
  min-height: 420px;
  border: 0;
}

.course-summary-card h3 {
  margin: 0 0 10px;
}

.course-summary-card p {
  color: var(--course-text-muted);
  line-height: 1.7;
}

.course-accordion {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.course-module {
  overflow: hidden;
}

.course-module-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  cursor: pointer;
  padding: 16px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.course-module-header:hover {
  background: rgba(255, 255, 255, 0.04);
}

.course-module-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.module-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--course-text);
  border: 1px solid rgba(255, 255, 255, 0.12);
  text-decoration: none;
  font-size: 0.85rem;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.module-action-btn:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.18);
}

.course-module-header h4 {
  margin: 0;
  font-size: 1.05rem;
}

.course-module-header span {
  color: var(--course-text-muted);
}

.course-module.open .course-module-header span:last-child {
  transform: rotate(180deg);
}

.course-module-body {
  display: none;
  margin-top: 20px;
  gap: 14px;
}

.course-module.open .course-module-body {
  display: grid;
}

.lesson-item {
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 16px;
  align-items: center;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.lesson-item:hover {
  transform: translateY(-1px);
  background: rgba(139, 92, 246, 0.08);
}

.download-thumbnail {
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(139, 92, 246, 0.12);
}

.download-icon {
  font-size: 1.2rem;
  color: var(--course-text);
}

.lesson-action {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(139, 92, 246, 0.95);
  color: #fff;
  font-size: 0.8rem;
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease;
}

.download-btn:hover {
  background: rgba(139, 92, 246, 1);
  transform: translateY(-1px);
}

.lesson-item.selected {
  border-color: var(--course-accent);
  background: rgba(139, 92, 246, 0.16);
}

.lesson-thumbnail {
  width: 72px;
  height: 48px;
  border-radius: 16px;
  overflow: hidden;
  flex-shrink: 0;
}

.lesson-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.lesson-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.lesson-title {
  font-size: 0.98rem;
  color: var(--course-text);
}

.lesson-duration {
  color: var(--course-text-muted);
  font-size: 0.85rem;
}

.lesson-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--course-success);
}

.lesson-status.incomplete {
  color: var(--course-text-muted);
}

.lesson-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}

.course-not-found {
  margin-top: 30px;
  padding: 28px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
}

.course-not-found.hidden {
  display: none;
}

.player-error {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(5,5,7,0.6);
  color: #fff;
  padding: 20px;
  text-align: center;
  z-index: 20;
}

.player-error p { margin: 0; }
.player-error a { color: var(--course-accent); font-weight: 700; text-decoration: underline; }
.hidden { display: none; }

@media (max-width: 960px) {
  .course-header,
  .course-layout {
    grid-template-columns: 1fr;
  }

  .player-frame iframe {
    min-height: 260px;
  }
}

@media (max-width: 720px) {
  .course-page {
    padding: 18px 16px 24px;
  }

  .course-player-panel,
  .course-sidebar {
    gap: 16px;
  }

  .lesson-item {
    grid-template-columns: 68px 1fr;
  }

  .lesson-status {
    display: none;
  }
}