* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f5f5;
  color: #222;
}

header {
  background: #0066cc;
  color: #fff;
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  margin: 0;
  font-size: 1.3rem;
}

.user-select {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.user-select label {
  font-size: 0.9rem;
}

nav {
  display: flex;
  gap: 0.5rem;
  padding: 0.5rem 0.5rem;
  background: #e6effa;
  overflow-x: auto;
}

nav button {
  border: none;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  background: #ffffff;
  cursor: pointer;
  font-size: 0.9rem;
  white-space: nowrap;
}

nav button.active {
  background: #0066cc;
  color: #fff;
  font-weight: 600;
}

main {
  padding: 0.75rem;
  max-width: 900px;
  margin: 0 auto;
}

.section {
  display: none;
  background: #fff;
  border-radius: 0.75rem;
  padding: 0.75rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

.section.active {
  display: block;
}

.section h2 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

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

.form-row input,
.form-row select,
.form-row button {
  font-size: 0.9rem;
  padding: 0.35rem 0.5rem;
}

.form-row input,
.form-row select {
  border-radius: 0.4rem;
  border: 1px solid #ccc;
  min-width: 120px;
}

.form-row button {
  border-radius: 0.4rem;
  border: none;
  background: #0066cc;
  color: #fff;
  cursor: pointer;
}

.form-row button:hover {
  opacity: 0.9;
}

.list-container {
  max-height: 55vh;
  overflow-y: auto;
  border-top: 1px solid #eee;
  padding-top: 0.5rem;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

li.item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0;
  border-bottom: 1px solid #f0f0f0;
  gap: 0.4rem;
}

.item-main {
  flex: 1;
  min-width: 0;
}

.item-main strong {
  display: block;
}

.item-meta {
  font-size: 0.75rem;
  color: #666;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  background: #e3ecff;
  margin-right: 0.2rem;
}

button.delete-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 0.9rem;
  color: #cc0000;
}

button.secondary {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  padding: 0.3rem 0.6rem;
  border-radius: 999px;
  border: 1px solid #0066cc;
  background: #ffffff;
  color: #0066cc;
}

button.secondary:hover {
  background: #e6effa;
}

.hint {
  font-size: 0.8rem;
  color: #666;
  margin-top: 0;
}

footer {
  text-align: center;
  font-size: 0.75rem;
  padding: 0.5rem;
  color: #777;
}
@media (max-width: 600px) {
  .form-row {
    flex-direction: column;
  }
}