:root {
  --bg: #0d1117;
  --card: #161b22;
  --borda: #30363d;
  --texto: #e6edf3;
  --suave: #8b949e;
  --a1: #58a6ff;
  --a2: #bc8cff;
  --erro: #ff7b72;
  --ok: #3fb950;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  color: var(--texto);
  background:
    radial-gradient(900px 500px at 10% -10%, rgba(88, 166, 255, 0.18), transparent),
    radial-gradient(800px 500px at 100% 0, rgba(188, 140, 255, 0.16), transparent),
    var(--bg);
}

main { max-width: 760px; margin: 0 auto; padding: 40px 20px 64px; }

header { text-align: center; margin-bottom: 28px; }

.selo {
  display: inline-block;
  padding: 4px 12px;
  border: 1px solid var(--borda);
  border-radius: 999px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--suave);
}

h1 {
  margin: 14px 0 8px;
  font-size: clamp(2rem, 6vw, 3rem);
  background: linear-gradient(90deg, var(--a1), var(--a2), #f778ba);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

header p { margin: 0 auto; max-width: 520px; color: var(--suave); }

.cartao {
  background: rgba(22, 27, 34, 0.85);
  border: 1px solid var(--borda);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}

.passo { display: flex; gap: 16px; align-items: flex-start; margin: 0; }
.passo + .passo {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--borda);
}

.num {
  flex: none;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-weight: 700;
  color: #0d1117;
  background: linear-gradient(135deg, var(--a1), var(--a2));
}

.conteudo { flex: 1; min-width: 0; }
h2 { margin: 4px 0 10px; font-size: 1.05rem; }
label { display: block; margin-bottom: 6px; font-size: 0.9rem; color: var(--suave); }

.linha { display: flex; gap: 10px; flex-wrap: wrap; }

input[type="number"] {
  flex: 1;
  min-width: 120px;
  padding: 11px 14px;
  font-size: 1rem;
  color: var(--texto);
  background: var(--bg);
  border: 1px solid var(--borda);
  border-radius: 10px;
  outline: none;
}
input[type="number"]:focus {
  border-color: var(--a1);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.25);
}

button {
  padding: 11px 22px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: 0;
  border-radius: 10px;
  color: #0d1117;
  background: linear-gradient(135deg, var(--a1), var(--a2));
  transition: transform 0.15s, filter 0.15s;
}
button:hover { filter: brightness(1.1); transform: translateY(-1px); }
button:disabled { opacity: 0.6; cursor: wait; transform: none; }

#baixar {
  display: block;
  margin: 18px auto 0;
  color: var(--texto);
  background: transparent;
  border: 1px solid var(--borda);
}
#baixar:hover { border-color: var(--a1); }

#status-login { margin: 10px 0 0; font-size: 0.9rem; color: var(--ok); }

#mensagem { min-height: 1.4em; margin: 18px 0 0; font-size: 0.95rem; }
#mensagem.erro { color: var(--erro); }
#mensagem.ok { color: var(--ok); }

#desenho { margin: 18px 0 0; }
#desenho:empty::before {
  content: "O desenho aparece aqui";
  display: grid;
  place-items: center;
  min-height: 200px;
  border: 1px dashed var(--borda);
  border-radius: 12px;
  color: var(--suave);
}
#desenho svg { display: block; width: 100%; height: auto; border-radius: 12px; }

@media (max-width: 520px) {
  .passo { flex-direction: column; gap: 10px; }
  .cartao { padding: 18px; }
}