:root {
  --ink: #0f172a;
  --muted: #475569;
  --line: #e2e8f0;
  --bg: #f4f7fb;
  --card: #fff;
  --green: #0f766e;
  --green-dark: #115e59;
  --gold: #d97706;
  --ok: #166534;
  --err: #b91c1c;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
}
a { color: var(--green); }
.wrap { max-width: 920px; margin: 0 auto; padding: 24px 16px 64px; }
.top {
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; flex-wrap: wrap; margin-bottom: 24px;
}
.brand { font-weight: 800; color: var(--green-dark); text-decoration: none; font-size: 1.05rem; }
.hero, .card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .04);
}
.hero h1 { margin: 0 0 8px; font-size: clamp(1.6rem, 4vw, 2.3rem); }
.kicker { color: var(--gold); font-weight: 700; letter-spacing: .04em; text-transform: uppercase; font-size: .78rem; }
.preco { font-size: 2rem; font-weight: 800; margin: 12px 0; }
.preco small { font-size: 1rem; color: var(--muted); font-weight: 600; }
.grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; }
.video-aula {
    width: 100%;
    margin-bottom: 28px;
    border-radius: 14px;
    overflow: hidden;
    background: #000;
}

.video-aula video {
    display: block;
    width: 100%;
    height: auto;
}
@media (max-width: 800px) { .grid { grid-template-columns: 1fr; } }
.btn {
  display: inline-block; text-align: center; text-decoration: none;
  background: linear-gradient(135deg, #0f766e, #0d9488);
  color: #fff !important; font-weight: 800; border: 0; border-radius: 12px;
  padding: 13px 18px; cursor: pointer; width: 100%; font-size: 1rem;
}
.btn.sec { background: #fff; color: var(--green-dark) !important; border: 1px solid var(--line); }
label { display: block; font-size: .82rem; font-weight: 700; margin: 12px 0 6px; }
input {
  width: 100%; padding: 12px; border-radius: 10px; border: 1px solid #cbd5e1;
  font-size: 1rem;
}
.erro, .ok, .aviso {
  border-radius: 10px; padding: 10px 12px; margin: 0 0 14px; font-size: .92rem;
}
.erro { background: #fef2f2; color: var(--err); border: 1px solid #fecaca; }
.ok { background: #f0fdf4; color: var(--ok); border: 1px solid #bbf7d0; }
.aviso { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }
.lista { padding-left: 18px; }
.lista li { margin: 6px 0; }
.nav-aula { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0 8px; }
.nav-aula a {
  text-decoration: none; font-size: .82rem; padding: 6px 10px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff; color: var(--ink);
}
.nav-aula a.now { background: var(--green); color: #fff; border-color: var(--green); }
.lesson h2 { margin-top: 0; }
.bizu {
  display: inline-block; background: #7c3aed; color: #fff; font-weight: 800;
  border-radius: 999px; padding: 4px 10px; font-size: .78rem; margin-bottom: 8px;
}
.exemplo { background: #f8fafc; border-left: 4px solid var(--green); padding: 12px 14px; border-radius: 0 12px 12px 0; }
footer { margin-top: 28px; color: var(--muted); font-size: .85rem; }
.alts { font-family: ui-monospace, Consolas, monospace; }