:root {
  --bg: #f7f7f7;
  --card: #ffffff;
  --border: #ddd;
  --accent: #3f51b5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background: var(--bg);
  color: #222;
}

header {
  background: var(--accent);
  color: white;
  padding: 1rem;
  text-align: center;
}

main {
  max-width: 1000px;
  margin: auto;
  padding: 1rem;
}

.card {
  background: var(--card);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.section-title {
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.25rem;
}

h2,
h3 {
  margin-top: 0;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
}

input,
select {
  padding: 6px;
  font-size: 1rem;
  margin-top: 4px;
}

button {
  margin-top: 1rem;
  padding: 10px 20px;
  font-size: 1rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

th,
td {
  border: 1px solid var(--border);
  padding: 6px 8px;
  font-size: 0.9rem;
}

th {
  background: #f0f0f0;
}

details {
  margin-bottom: 8px;
}

summary {
  cursor: pointer;
  font-weight: 600;
}

tr.current {
  background-color: #fff3cd;
  font-weight: bold;
}

/* Mobile tweaks */
@media (max-width: 600px) {
  table {
    font-size: 0.8rem;
  }
}