/* Tokens de cor: o site é escuro, sem modo claro (UI-01). */
:root {
  --bg: #141414;
  --text: #ffffff;
  --text-muted: #b3b3b3;
  --accent: #e50914;
  --surface: #2a2a2a;
  --focus: #ffffff;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.5;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Margem de 16 px abaixo de 768 px; acima, o conteúdo fica centralizado (UI-03). */
.app-main {
  margin-inline: 16px;
  padding-block: 72px 32px;
}

@media (min-width: 768px) {
  .app-main {
    margin-inline: max(16px, calc((100% - 1280px) / 2));
  }
}

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  background: var(--bg);
}

.topbar[hidden] {
  display: none;
}

.topbar-curso {
  font-weight: 700;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.botao {
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--text-muted);
  border-radius: 4px;
  background: transparent;
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

.botao:disabled {
  opacity: 0.6;
  cursor: wait;
}

.aviso {
  color: var(--text-muted);
}

.tela {
  max-width: 420px;
  padding-block: 16px;
}

.formulario label {
  display: grid;
  gap: 4px;
  margin-top: 12px;
}

.formulario input {
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--surface);
  border-radius: 4px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

.formulario button {
  width: 100%;
  margin-top: 16px;
}

.erro-campo {
  min-height: 1.5em;
  margin: 4px 0 0;
  color: #ff8a80;
  font-size: 0.9rem;
}

.mensagem {
  min-height: 1.5em;
}

.home {
  display: grid;
  gap: 32px;
  min-width: 0;
}

.destaque {
  display: grid;
  justify-items: start;
  gap: 12px;
  padding-block: 24px;
}

.destaque h1 {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

.destaque-modulo {
  margin: 0;
  color: var(--text-muted);
}

.botao-destaque {
  display: inline-flex;
  align-items: center;
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
  font-weight: 700;
  text-decoration: none;
}

.linha {
  position: relative;
  min-width: 0;
}

/* Setas só com ponteiro fino e a partir de 768 px, sobre a linha que o ponteiro ocupa (UI-07). */
.seta {
  display: none;
  position: absolute;
  top: 50%;
  z-index: 2;
  width: 40px;
  height: 40px;
  translate: 0 -50%;
  border: 0;
  border-radius: 50%;
  background: rgba(20, 20, 20, 0.85);
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.seta-esquerda {
  left: -12px;
}

.seta-direita {
  right: -12px;
}

@media (min-width: 768px) and (hover: hover) and (pointer: fine) {
  .linha:hover .seta {
    display: block;
  }
}

.linha h2 {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.linha h2 a {
  color: inherit;
  text-decoration: none;
}

.linha-cards {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x proximity;
}

.linha-cards .card {
  flex: 0 0 240px;
  scroll-snap-align: start;
  color: inherit;
  text-decoration: none;
}

.card img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 4px;
  background: var(--surface);
}

.card-titulo {
  display: block;
  margin-top: 8px;
  font-size: 0.95rem;
}

.barra {
  height: 6px;
  margin: 8px 0 4px;
  border-radius: 3px;
  background: var(--surface);
  overflow: hidden;
}

.barra span {
  display: block;
  height: 100%;
  background: var(--accent);
}

.selo {
  display: inline-block;
  margin-bottom: 4px;
  padding: 2px 8px;
  border-radius: 3px;
  background: var(--accent);
  font-size: 0.8rem;
}

.aula,
.modulo {
  display: grid;
  gap: 16px;
  min-width: 0;
}

.player-caixa {
  width: 100%;
  max-width: 1100px;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 4px;
  background: #000;
}

.player-caixa iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.acoes {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.acoes .botao {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.descricao {
  margin: 0;
  color: var(--text-muted);
}

.lista-aulas {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.lista-aulas li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px;
  border-radius: 4px;
  background: var(--surface);
}

.lista-aulas a {
  color: inherit;
}

.estado {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Card de aula: escala só com ponteiro fino e sem movimento reduzido (UI-04, UI-05). */
.card {
  display: block;
  transition: transform 200ms ease;
}

@media (hover: hover) and (pointer: fine) {
  .card:hover {
    transform: scale(1.05);
  }
}

@media (prefers-reduced-motion: reduce) {
  .card {
    transition: none;
  }

  .card:hover {
    transform: none;
  }
}