*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --azul: #1a56db; --azul-esc: #1341b0;
  --verde: #059669; --vermelho: #dc2626;
  --cinza: #f3f4f6; --text: #111827; --text-sec: #6b7280;
}
body { font-family: system-ui, sans-serif; color: var(--text); background: var(--cinza); }
.container { max-width: 480px; margin: 0 auto; padding: 1rem; }
.card { background: #fff; border-radius: 12px; padding: 1.25rem; margin-bottom: 0.75rem; box-shadow: 0 1px 3px rgba(0,0,0,.08); }
h1 { font-size: 1.3rem; margin-bottom: 0.75rem; }
h2 { font-size: 1rem; margin-bottom: 0.5rem; }
label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 0.25rem; color: var(--text-sec); }
input { width: 100%; padding: 0.65rem 0.85rem; border: 1px solid #e5e7eb; border-radius: 8px; font-size: 1rem; margin-bottom: 0.75rem; }
input:focus { outline: none; border-color: var(--azul); }
.btn { display: block; width: 100%; padding: 0.85rem; border-radius: 8px; border: none; cursor: pointer; font-size: 1rem; font-weight: 700; text-align: center; }
.btn-primary { background: var(--azul); color: #fff; }
.btn-green { background: var(--verde); color: #fff; }
.btn-danger { background: var(--vermelho); color: #fff; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }
.erro { color: var(--vermelho); font-size: 0.85rem; margin-bottom: 0.75rem; }
.ex-card { background: #fff; border-radius: 12px; padding: 1rem 1.25rem; margin-bottom: 0.75rem; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 1px 3px rgba(0,0,0,.08); cursor: pointer; }
.ex-card:hover { background: #f0f4ff; }
.ex-nome { font-weight: 600; }
.ex-det { font-size: 0.8rem; color: var(--text-sec); }
#video { width: 100%; border-radius: 12px; background: #000; }
canvas { display: none; }
#alerta-box { background: #fef3c7; border: 1px solid #f59e0b; border-radius: 8px; padding: 0.75rem; margin-top: 0.75rem; font-weight: 600; display: none; }
#coach-voz { position: fixed; bottom: 1rem; left: 50%; transform: translateX(-50%); background: rgba(0,0,0,0.8); color: #fff; padding: 0.75rem 1.5rem; border-radius: 99px; font-weight: 600; display: none; }