* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f7fb;
  color: #10223d;
}

.site-header {
  background: #10223d;
  color: #fff;
  padding: 1rem;
}

.site-header h1 {
  margin: 0 0 0.25rem;
}

.tabs {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: #e9eff9;
  border-bottom: 1px solid #d6e0f3;
}

.tab-button {
  border: 1px solid #b2c4e5;
  background: #fff;
  color: #10223d;
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
}

.tab-button.active {
  background: #10223d;
  color: #fff;
}

main {
  padding: 1rem;
  max-width: 900px;
}

.tab-panel,
.tracker-step {
  display: none;
}

.tab-panel.active,
.tracker-step.active {
  display: block;
}

.row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.5rem 0;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  max-width: 340px;
  padding: 0.5rem;
  border: 1px solid #b2c4e5;
  border-radius: 6px;
}

button {
  border: 1px solid #10223d;
  background: #10223d;
  color: #fff;
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
}

button:hover {
  background: #18345d;
}

.result {
  min-height: 1.2rem;
  font-weight: bold;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.75rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

canvas {
  width: 100%;
  max-width: 720px;
  border: 1px solid #b2c4e5;
  background: #fff;
}

.hint {
  font-size: 0.9rem;
  color: #2e476f;
}

#item-list {
  padding-left: 1.25rem;
}

#summary-content table {
  width: 100%;
  border-collapse: collapse;
}

#summary-content th,
#summary-content td {
  border: 1px solid #b2c4e5;
  padding: 0.4rem;
  text-align: left;
}