:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #dbe2ea;
  --primary: #1d4ed8;
  --good-bg: #dcfce7;
  --good-text: #14532d;
  --ok-bg: #fef3c7;
  --ok-text: #78350f;
  --low-bg: #fee2e2;
  --low-text: #7f1d1d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

main {
  max-width: 56rem;
  margin: 0 auto;
  padding: 1rem;
}

h1 {
  font-size: 1.6rem;
  margin: 0;
}

.intro {
  color: var(--muted);
  margin: 0.5rem 0 1.25rem;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem;
  box-shadow: 0 6px 20px rgba(15, 23, 42, 0.04);
}

.form-grid {
  display: grid;
  gap: 0.75rem;
}

.field {
  display: grid;
  gap: 0.4rem;
}

label {
  font-weight: 600;
}

input[type="time"],
input[type="number"],
select {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 0.55rem;
  padding: 0.65rem 0.75rem;
  font: inherit;
  background: #fff;
}

.actions {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

button {
  border: 0;
  border-radius: 0.6rem;
  padding: 0.7rem 0.9rem;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  cursor: pointer;
}

button.secondary {
  background: #334155;
}

button.ghost {
  background: #e2e8f0;
  color: #0f172a;
}

.result {
  margin-top: 1rem;
}

.result p {
  margin: 0.3rem 0;
  color: var(--muted);
}

.cards {
  margin-top: 0.85rem;
  display: grid;
  gap: 0.6rem;
}

.card {
  border-radius: 0.65rem;
  padding: 0.75rem;
  border: 1px solid transparent;
}

.card h3 {
  margin: 0;
  font-size: 1.05rem;
}

.card p {
  margin: 0.2rem 0 0;
  font-size: 0.95rem;
}

.card.good {
  background: var(--good-bg);
  color: var(--good-text);
  border-color: #86efac;
}

.card.ok {
  background: var(--ok-bg);
  color: var(--ok-text);
  border-color: #fcd34d;
}

.card.low {
  background: var(--low-bg);
  color: var(--low-text);
  border-color: #fca5a5;
}

.hidden {
  display: none;
}

@media (min-width: 40rem) {
  .actions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}