/* ==========================================================================
   Página de cursos — apresentação estilo streaming (mesma paleta da sala de estudo)
   ========================================================================== */
.stream-body { background: #070c17; color: var(--on-dark); }
.stream-body .site-footer { background: #070c17; border-top: 1px solid var(--ink-line); }

/* ---------- Destaque (billboard) ---------- */
.billboard { position: relative; min-height: clamp(560px, 86vh, 920px); overflow: hidden; background: #070c17; }
.bb-slide { position: absolute; inset: 0; display: flex; align-items: flex-end; }
.bb-slide[hidden] { display: none; }
.bb-slide.is-active { animation: bbIn 0.8s var(--ease) both; }
@keyframes bbIn { from { opacity: 0; } to { opacity: 1; } }
.bb-art { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 70% 30%; }
.bb-slide.is-active .bb-art { animation: bbZoom 12s linear both; }
@keyframes bbZoom { from { transform: scale(1.06); } to { transform: scale(1); } }
.bb-shade { position: absolute; inset: 0; background:
  linear-gradient(90deg, rgba(7,12,23,0.92) 0%, rgba(7,12,23,0.65) 34%, rgba(7,12,23,0) 62%),
  linear-gradient(0deg, #070c17 0%, rgba(7,12,23,0.55) 24%, rgba(7,12,23,0) 48%),
  linear-gradient(180deg, rgba(7,12,23,0.6) 0%, rgba(7,12,23,0) 18%); }
.bb-content { position: relative; z-index: 1; padding-bottom: clamp(5.5rem, 12vh, 8rem); }
.bb-content > * { max-width: 40rem; }
.bb-kicker { display: flex; align-items: center; gap: 0.55rem; font-family: var(--font-display); font-weight: 700; font-size: 0.78rem; letter-spacing: 0.24em; text-transform: uppercase; color: #fff; }
.bb-kicker img { width: 14px; height: auto; }
.bb-badge { letter-spacing: 0.06em; font-size: 0.72rem; font-weight: 600; padding: 0.22rem 0.6rem; border-radius: 6px; background: var(--emerald); color: #04170f; margin-left: 0.3rem; }
.bb-title { color: #fff; font-size: clamp(2.6rem, 1.4rem + 5vw, 5.4rem); font-weight: 700; letter-spacing: -0.035em; line-height: 0.98; margin-top: 0.8rem; text-shadow: 0 4px 40px rgba(0,0,0,0.45); max-width: 14ch; }
.bb-synopsis { color: #d3dbe8; font-size: clamp(1rem, 0.95rem + 0.3vw, 1.18rem); line-height: 1.55; margin-top: 1rem; text-shadow: 0 2px 16px rgba(0,0,0,0.5); }
.bb-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.7rem; }

.stream-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.35rem 0.8rem; margin-top: 1rem; font-size: 0.92rem; color: #c4cede; }
.stream-meta > span + span::before { content: ""; display: inline-block; width: 4px; height: 4px; border-radius: 50%; background: rgba(255,255,255,0.35); margin-right: 0.8rem; vertical-align: middle; }
.sm-price { font-family: var(--font-display); font-weight: 700; color: #fff; }
.sm-price.is-free { color: var(--emerald-bright); }

/* Botões no estilo player */
.btn-play { background: #fff; color: #070c17; border-radius: 10px; font-weight: 700; }
.btn-play:hover { background: var(--emerald-bright); color: #04170f; }
.btn-play svg { width: 1.1em; height: 1.1em; }
.btn-glass { background: rgba(255,255,255,0.14); color: #fff; border-radius: 10px; backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.btn-glass:hover { background: rgba(255,255,255,0.24); }
.btn-glass svg { width: 1.15em; height: 1.15em; }

.bb-dots-wrap { position: absolute; left: 0; right: 0; bottom: clamp(2rem, 5vh, 3rem); z-index: 2; display: flex; justify-content: flex-end; }
.bb-dots { display: flex; gap: 0.5rem; }
.bb-dot { width: 44px; height: 24px; padding: 10px 0; border: 0; background: transparent; cursor: pointer; }
.bb-dot span { display: block; height: 4px; border-radius: 999px; background: rgba(255,255,255,0.28); overflow: hidden; position: relative; }
.bb-dot span::after { content: ""; position: absolute; inset: 0; width: 0; background: #fff; border-radius: inherit; }
.bb-dot[aria-selected="true"] span::after { width: 100%; }
.billboard.is-playing .bb-dot[aria-selected="true"] span::after { width: 0; animation: bbFill var(--bb-interval, 8s) linear forwards; }
.billboard.is-paused .bb-dot[aria-selected="true"] span::after { animation-play-state: paused; }
@keyframes bbFill { to { width: 100%; } }

/* ---------- Fileiras ---------- */
.stream-rows { position: relative; z-index: 2; margin-top: -3.5rem; padding-bottom: clamp(3rem, 7vw, 5rem); }
.stream-row { padding-top: clamp(1.6rem, 3.5vw, 2.4rem); }
.row-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; }
.row-head h2 { color: #fff; font-size: clamp(1.15rem, 1rem + 0.6vw, 1.45rem); font-weight: 600; letter-spacing: -0.01em; display: flex; flex-direction: column; gap: 0.25rem; }
.row-kicker { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--emerald-bright); }
.stream-row .rail { margin-top: 0.4rem; padding-top: 0.9rem; padding-bottom: 1.6rem; }

/* Cards de curso (16:9, título sobreposto; revelam detalhes no hover/foco) */
.rail-titles { --card-w: clamp(280px, 30vw, 420px); }
.title-card { position: relative; display: block; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #0d1526; box-shadow: 0 12px 30px rgba(0,0,0,0.35); outline-offset: 4px; transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease); }
.title-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 70% 30%; transition: transform 0.6s var(--ease); }
.title-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(7,12,23,0.95) 0%, rgba(7,12,23,0.55) 38%, rgba(7,12,23,0) 70%); transition: background 0.35s var(--ease); }
.tc-badge { position: absolute; top: 0.8rem; left: 0.8rem; z-index: 1; font-family: var(--font-display); font-size: 0.7rem; font-weight: 700; letter-spacing: 0.04em; padding: 0.25rem 0.6rem; border-radius: 6px; background: var(--gold); color: #3a2c00; }
.tc-badge.is-green { background: var(--emerald); color: #04170f; }
.tc-body { position: absolute; left: 0; right: 0; bottom: 0; z-index: 1; padding: 1rem 1.1rem 1.05rem; display: flex; flex-direction: column; }
.tc-title { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.15rem, 1rem + 0.6vw, 1.5rem); line-height: 1.1; letter-spacing: -0.02em; color: #fff; }
.tc-more { display: grid; grid-template-rows: 0fr; opacity: 0; transition: grid-template-rows 0.35s var(--ease), opacity 0.3s var(--ease); }
.tc-more > * { overflow: hidden; }
.tc-more .stream-meta { margin-top: 0.5rem; font-size: 0.82rem; }
.tc-summary { display: none; }
.title-card:hover, .title-card:focus-visible { transform: scale(1.03); box-shadow: 0 22px 50px rgba(0,0,0,0.55); }
.title-card:hover img, .title-card:focus-visible img { transform: scale(1.05); }
.title-card:hover .tc-more, .title-card:focus-visible .tc-more { grid-template-rows: 1fr; opacity: 1; }

/* Episódios (aulas) */
.rail-episodes { --card-w: 300px; }
.ep-card { display: flex; flex-direction: column; gap: 0.65rem; color: var(--on-dark); }
.ep-thumb { position: relative; display: block; aspect-ratio: 16 / 9; border-radius: 10px; overflow: hidden; background: #0d1526; }
.ep-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease), filter 0.3s var(--ease); }
.ep-play { position: absolute; inset: 0; margin: auto; width: 52px; height: 52px; border-radius: 50%; display: grid; place-items: center; background: rgba(7,12,23,0.55); border: 1.5px solid rgba(255,255,255,0.6); color: #fff; opacity: 0; transform: scale(0.9); transition: opacity 0.25s var(--ease), transform 0.25s var(--ease); }
.ep-play svg { width: 20px; margin-left: 3px; }
.ep-dur { position: absolute; right: 0.5rem; bottom: 0.5rem; font-family: var(--font-mono); font-size: 0.72rem; padding: 0.12rem 0.4rem; border-radius: 4px; background: rgba(0,0,0,0.75); color: #fff; }
.ep-done { position: absolute; left: 0.5rem; top: 0.5rem; display: none; align-items: center; gap: 0.3rem; font-size: 0.72rem; font-weight: 700; padding: 0.2rem 0.55rem; border-radius: 6px; background: var(--emerald); color: #04170f; }
.ep-done svg { width: 0.9em; }
li.is-done .ep-done { display: inline-flex; }
li.is-done .ep-thumb img { filter: saturate(0.6) brightness(0.75); }
.ep-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 4px; background: rgba(255,255,255,0.25); }
.ep-progress span { display: block; height: 100%; background: var(--emerald-bright); }
.ep-text { display: flex; flex-direction: column; gap: 0.2rem; }
.ep-n { font-size: 0.75rem; font-weight: 600; color: var(--emerald-bright); }
.ep-title { font-family: var(--font-display); font-weight: 600; font-size: 0.98rem; line-height: 1.3; color: #fff; }
.ep-course { font-size: 0.78rem; color: var(--on-dark-muted); }
.ep-card:hover .ep-thumb img, .ep-card:focus-visible .ep-thumb img { transform: scale(1.06); }
.ep-card:hover .ep-play, .ep-card:focus-visible .ep-play { opacity: 1; transform: none; }

/* Professores */
.rail-people { --card-w: 220px; }
.person-card { position: relative; display: block; aspect-ratio: 3 / 4; border-radius: 12px; overflow: hidden; background: #0d1526; }
.person-card img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform 0.6s var(--ease); }
.person-card::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(7,12,23,0.92) 0%, rgba(7,12,23,0) 55%); }
.pc-body { position: absolute; left: 0; right: 0; bottom: 0; z-index: 1; padding: 1rem; display: flex; flex-direction: column; gap: 0.2rem; }
.pc-name { font-family: var(--font-display); font-weight: 700; color: #fff; font-size: 1.1rem; }
.pc-role { font-size: 0.8rem; color: var(--on-dark-muted); }
.person-card:hover img, .person-card:focus-visible img { transform: scale(1.05); }

/* ---------- Responsivo ---------- */
@media (max-width: 760px) {
  .billboard { min-height: 0; }
  .bb-slide { position: relative; flex-direction: column; align-items: stretch; }
  .bb-art { position: relative; height: auto; aspect-ratio: 4 / 3; object-position: 75% 25%; }
  .bb-shade { background: linear-gradient(0deg, #070c17 0%, rgba(7,12,23,0) 40%), linear-gradient(180deg, rgba(7,12,23,0.7) 0%, rgba(7,12,23,0) 25%); height: auto; aspect-ratio: 4 / 3; bottom: auto; }
  .bb-content { margin-top: -5.5rem; padding-bottom: 4.5rem; }
  .bb-title { font-size: clamp(2.2rem, 1.4rem + 5vw, 3rem); }
  .bb-dots-wrap { bottom: 1.4rem; justify-content: flex-start; }
  .bb-actions .btn { flex: 1; }
  .stream-rows { margin-top: 0; }
  .rail-titles { --card-w: 82vw; }
  .tc-more { grid-template-rows: 1fr; opacity: 1; }
  .rail-episodes { --card-w: 70vw; }
  .rail-people { --card-w: 44vw; }
  .stream-row .rail > li { flex-basis: var(--card-w); }
}
@media (prefers-reduced-motion: reduce) {
  .bb-slide.is-active, .bb-slide.is-active .bb-art { animation: none; }
}

/* Aulas do curso completo e para membros nas fileiras */
.row-kicker.is-gold { color: var(--gold); }
li.is-locked .ep-thumb img { filter: grayscale(0.7) brightness(0.45) blur(1px); }
.ep-lock { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 0.35rem; font-family: var(--font-display); font-weight: 700; font-size: 0.8rem; letter-spacing: 0.04em; color: #fff; text-align: center; }
.ep-lock svg { width: 1.5rem; height: 1.5rem; color: var(--emerald-bright); }
li.is-locked .ep-play { display: none; }
.ep-members { position: absolute; left: 0.5rem; top: 0.5rem; font-size: 0.68rem; font-weight: 700; padding: 0.18rem 0.5rem; border-radius: 6px; background: var(--gold); color: #3a2c00; }
.ep-members { display: inline-flex; align-items: center; gap: 0.25rem; }
.ep-members svg { width: 0.8rem; height: 0.8rem; }
.ep-open { position: absolute; left: 0.5rem; top: 0.5rem; font-size: 0.68rem; font-weight: 700; padding: 0.18rem 0.5rem; border-radius: 6px; background: var(--emerald); color: #04170f; }

/* ---------- Filtro por tema ---------- */
.topic-filter-wrap { margin-top: clamp(2.4rem, 5vw, 3.4rem); margin-bottom: 0.4rem; padding-top: clamp(1.6rem, 3vw, 2.2rem); border-top: 1px solid rgba(255,255,255,0.08); }
.topic-filter { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; }
.topic-filter-label { font-family: var(--font-display); font-size: 0.78rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase; color: var(--on-dark-muted); margin-right: 0.3rem; }
.topic-chip { font-family: var(--font-display); font-weight: 600; font-size: 0.9rem; color: var(--on-dark); background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.14); padding: 0.45rem 0.95rem; border-radius: 999px; cursor: pointer; transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease); }
.topic-chip:hover { border-color: rgba(255,255,255,0.35); background: rgba(255,255,255,0.1); }
.topic-chip[aria-pressed="true"] { background: #fff; border-color: #fff; color: #070c17; }
.topic-chip:focus-visible { outline: 2px solid var(--emerald-bright); outline-offset: 2px; }
.topic-filter-empty { margin-top: 1rem; color: var(--on-dark-muted); }
.stream-row[hidden], .rail > li[hidden] { display: none; }
@media (max-width: 600px) {
  .topic-filter { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; margin-inline: calc(-1 * var(--gutter)); padding-inline: var(--gutter); }
  .topic-filter::-webkit-scrollbar { display: none; }
  .topic-chip, .topic-filter-label { flex: none; }
}