:root {
  --bg: #101418;
  --card: #1b2026;
  --text: #f2f4f6;
  --muted: #9aa5b1;
  --accent: #ffb020;
  --accent-text: #101418;
  --danger: #e5484d;
  --border: #2a313a;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  padding-bottom: 32px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px calc(16px + env(safe-area-inset-top, 0px));
  padding-top: max(16px, env(safe-area-inset-top));
}

.topbar h1 {
  font-size: 1.15rem;
  margin: 0;
}

.icon-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 1.1rem;
  cursor: pointer;
}

main {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
}

.card h2 {
  font-size: 1rem;
  margin: 0 0 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 12px;
}

input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #0d1115;
  color: var(--text);
  font-size: 1.1rem;
}

input:focus {
  outline: 2px solid var(--accent);
}

.btn-primary, .btn-secondary {
  width: 100%;
  padding: 14px;
  border-radius: 10px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  margin-top: 10px;
}

.btn-stop {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}

.btn-primary:disabled, .btn-secondary:disabled, .btn-stop:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.resultado, .totales {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-bottom: 14px;
}

.resultado div, .totales div {
  background: #0d1115;
  border-radius: 10px;
  padding: 10px 12px;
}

.resultado span, .totales span {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
}

.resultado strong, .totales strong {
  font-size: 1.2rem;
}

.hint {
  color: var(--muted);
  font-size: 0.8rem;
  margin: 10px 0 0;
}

.historial {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.historial li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #0d1115;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.9rem;
}

.historial .item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.historial .item-fecha {
  color: var(--muted);
  font-size: 0.75rem;
}

.historial button {
  background: none;
  border: none;
  color: var(--danger);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px 8px;
}