:root {
  --bg: #0f1724;
  --card: #0b1220;
  --accent: #60a5fa;
  --muted: #94a3b8;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  color: #e6eef8;
  background: linear-gradient(180deg, var(--bg), #071022);
}

.wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.01));
  width: 960px;
  max-width: 100%;
  border-radius: 12px;
  padding: 18px;
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.6);
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 18px;
}

canvas {
  background: linear-gradient(180deg, #051226 0%, #091829 100%);
  border-radius: 8px;
  width: 100%;
  height: 600px;
  display: block;
}

.side {
  padding: 8px;
}

h1 {
  margin: 4px 0 12px;
  font-size: 20px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap; /* ajuda no mobile */
}

.btn {
  background: var(--accent);
  color: #062038;
  border: none;
  padding: 10px 12px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
}

.btn.ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--muted);
}

label {
  font-size: 13px;
  color: var(--muted);
}

.stat {
  background: rgba(255, 255, 255, 0.02);
  padding: 12px;
  border-radius: 8px;
}

.big {
  font-size: 34px;
  font-weight: 700;
}

small {
  color: var(--muted);
}

footer {
  font-size: 12px;
  color: var(--muted);
  margin-top: 10px;
}

/* --- Responsividade --- */
@media (max-width: 900px) {
  .card {
    grid-template-columns: 1fr;
  }
  .side {
    order: 2;
  }
}

@media (max-width: 600px) {
  .wrap {
    padding: 12px;
  }
  .card {
    padding: 14px;
    gap: 12px;
  }
  h1 {
    font-size: 18px;
  }
  .btn {
    width: 100%;
    text-align: center;
  }
  canvas {
    height: 400px; /* reduz altura no celular */
  }
}

@media (max-width: 400px) {
  h1 {
    font-size: 16px;
  }
  .big {
    font-size: 26px;
  }
  canvas {
    height: 300px;
  }
}