:root {
  --bg: #090908;
  --panel: #151312;
  --panel-2: #1d1917;
  --line: rgba(245, 238, 225, 0.12);
  --text: #f4eee5;
  --muted: #b8aea2;
  --faint: #83776c;
  --accent: #a83e31;
  --accent-2: #d86652;
  --radius: 18px;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.35);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(168, 62, 49, 0.22), transparent 34rem),
    linear-gradient(180deg, #10100f 0%, var(--bg) 55%);
}

button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.app {
  width: min(100%, 1120px);
  margin: 0 auto;
  padding: 14px 14px 92px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 0 10px;
  background: linear-gradient(180deg, rgba(9, 9, 8, 0.96), rgba(9, 9, 8, 0.72), transparent);
  backdrop-filter: blur(14px);
}

h1, h2, h3, p { margin: 0; }

h1 {
  font-size: 1.15rem;
  letter-spacing: -0.04em;
}

h2 {
  font-size: clamp(1.65rem, 8vw, 3rem);
  line-height: 0.98;
  letter-spacing: -0.06em;
}

h3 {
  font-size: 1.05rem;
  letter-spacing: -0.025em;
}

p {
  color: var(--muted);
  line-height: 1.55;
}

.eyebrow {
  display: block;
  color: var(--faint);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-weight: 800;
}

.tabs {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(15, 14, 13, 0.92);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.tab, .primary, .secondary {
  border: 0;
  border-radius: 14px;
  cursor: pointer;
  font-weight: 800;
}

.tab {
  min-height: 44px;
  color: var(--muted);
  background: transparent;
}

.tab.active {
  color: var(--text);
  background: rgba(168, 62, 49, 0.22);
}

.secondary {
  min-height: 42px;
  padding: 0 14px;
  color: var(--text);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.primary {
  min-height: 46px;
  padding: 0 16px;
  color: white;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.screen {
  display: none;
  animation: enter 160ms ease both;
}

.screen.active {
  display: grid;
  gap: 14px;
}

@keyframes enter {
  from { opacity: 0; transform: translateY(6px); }
}

.hero, .panel, .video-panel, .lesson-card, .material-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(255, 255, 255, 0.018));
  box-shadow: var(--shadow);
}

.hero {
  display: grid;
  gap: 14px;
  padding: 22px;
  background:
    linear-gradient(135deg, rgba(168, 62, 49, 0.22), transparent 60%),
    linear-gradient(180deg, var(--panel-2), var(--panel));
}

.hero p { font-size: 1.02rem; }

.pill {
  display: inline-flex;
  width: fit-content;
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--text);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  font-size: 0.74rem;
  font-weight: 800;
}

.panel {
  display: grid;
  gap: 8px;
  padding: 16px;
}

.section-head {
  display: grid;
  gap: 7px;
  padding: 6px 0;
}

.section-head.compact { margin-top: 8px; }

.video-panel { overflow: hidden; }

.video-wrap {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #050505;
}

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

.empty-video {
  display: grid;
  place-items: center;
  height: 100%;
  color: var(--faint);
}

.video-copy {
  display: grid;
  gap: 10px;
  padding: 16px;
}

.lesson-list, .notice-list, .material-list {
  display: grid;
  gap: 10px;
}

.lesson-card {
  display: grid;
  gap: 9px;
  padding: 15px;
}

.lesson-card span {
  color: var(--faint);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.lesson-card.rascunho { opacity: 0.72; }

.material-card {
  display: grid;
  gap: 8px;
  padding: 16px;
  color: inherit;
  text-decoration: none;
}

.whatsapp {
  display: grid;
  place-items: center;
  min-height: 54px;
  margin-top: 4px;
  border-radius: var(--radius);
  color: white;
  text-decoration: none;
  font-weight: 900;
  background: #1f7a4d;
}

@media (min-width: 820px) {
  .app { padding-bottom: 32px; }

  .tabs {
    position: sticky;
    top: 72px;
    width: fit-content;
    grid-template-columns: repeat(4, auto);
    margin: 0 auto 18px;
  }

  .tab {
    min-width: 118px;
    padding: 0 18px;
  }

  .hero {
    min-height: 320px;
    align-content: center;
  }

  .video-panel {
    display: grid;
    grid-template-columns: 1.45fr 0.8fr;
  }

  .lesson-list, .notice-list, .material-list {
    grid-template-columns: repeat(3, 1fr);
  }
}