* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
:root {
  --dark: #2c2c2c;
  --gray: #e4e6c3;
  --accent: #9d00ff;
  --accent-hover: #7c00c8;
  --background: #f7f7f2;
  --danger: #a51c1c;
}
html {
  font-size: 16px;
}
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--background);
  color: var(--dark);
}

section {
  padding-bottom: 5px;
}

main {
  padding: 5px;
}

header {
  padding: 10px;
  text-align: center;
  background: #fff;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
}

header span {
  font-weight: bold;
  font-size: 0.8rem;
}
h1 {
  font-size: 1.3rem;
  color: var(--accent);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.container {
  margin: 0 auto;
  max-width: 800px;
  padding: 5px;
}

.card {
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  background: #fff;
}

.card h3 {
  border-bottom: 1px solid var(--gray);
  padding: 20px;
  font-size: 0.9rem;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.empty {
  color: #ccc;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

form {
  padding: 20px;
  font-size: 0.9rem;
}

form input,
form select,
form button {
  display: block;
  width: 100%;
  height: 40px;
  font-size: inherit;
  padding: 0 10px;
  border-radius: 4px;
  outline: none;
  border: 1px solid var(--gray);
}

form button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  transition: all 0.1s ease;
  transform: translateY(0);
}

form button:hover:active {
  transform: translateY(1px);
}

form button:hover {
  transform: translateY(-2px);
  background: var(--accent-hover);
}

#errorMessage {
  color: #fff;
  background: var(--danger);
  padding: 10px 20px;
  font-size: 0.8rem;
  display: none;
}

.expense-item,
.category-item {
  padding: 20px;
  border-top: 1px solid var(--gray);
  font-size: 16px;
}

.category-item:first-child,
.expense-item:first-child {
  border: none;
}

.category-item:nth-child(odd),
.expense-item:nth-child(odd) {
  background: #f7f6f6;
}

.category-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.item-category {
  border-radius: 3px;
  color: #fff;
  padding: 2px 5px;
  font-size: 0.7em;
}

.item-title {
  display: block;
  display: block;
  margin-top: 5px;
}

.item-date {
  color: #666;
  font-size: 0.8em;
}

.item-detail2 {
  margin-top: 5px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.item-amount {
  font-weight: bold;
  font-size: 0.9rem;
}

footer {
  text-align: center;
  font-size: 0.8rem;
  margin-top: 20px;
}
footer a {
  color: #666;
}

@media (min-width: 800px) {
  html {
    font-size: 18px;
  }
  .card-content {
    height: max(200px, 40vh);
    overflow: auto;
  }
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}