/* ===== Reset & Base ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f4f6f8;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #333;
}

/* ===== App Container ===== */
.app {
  background: #ffffff;
  width: 100%;
  max-width: 480px;
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.app h1 {
  text-align: center;
  margin-bottom: 1.2rem;
  font-size: 1.6rem;
}

/* ===== Form ===== */
.expense-form {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-bottom: 1rem;
}

.expense-form input,
.expense-form select {
  padding: 0.6rem 0.7rem;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 0.95rem;
}

.expense-form input:focus,
.expense-form select:focus {
  outline: none;
  border-color: #4f46e5;
}

.expense-form button {
  padding: 0.7rem;
  background: #4f46e5;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

.expense-form button:hover {
  background: #4338ca;
}

/* ===== Filter ===== */
.filter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 1rem 0;
  gap: 0.5rem;
}

.filter label {
  font-size: 0.9rem;
}

.filter select {
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  border: 1px solid #ddd;
  cursor: pointer;
}

/* ===== Expense List ===== */
.expense-list {
  list-style: none;
  margin-top: 0.5rem;
  max-height: 260px;
  overflow-y: auto;
}

.expense-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.4rem;
  border-bottom: 1px solid #eee;
  gap: 0.5rem;
}

.expense-info {
  display: flex;
  flex-direction: column;
}

.expense-title {
  font-size: 0.95rem;
  font-weight: 500;
}

.expense-category {
  font-size: 0.75rem;
  color: #777;
}

.expense-amount {
  font-weight: 600;
  color: #111;
}

/* ===== Delete Button ===== */
.delete-btn {
  background: #ef4444;
  border: none;
  color: #fff;
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
}

.delete-btn:hover {
  background: #dc2626;
}

/* ===== Total ===== */
.total {
  margin-top: 1rem;
  text-align: center;
  padding-top: 0.8rem;
  border-top: 1px solid #eee;
}

.total h3 {
  font-size: 1.1rem;
}

/* ===== Mobile Responsiveness ===== */
@media (max-width: 480px) {
  .app {
    border-radius: 0;
    min-height: 100vh;
    box-shadow: none;
  }
}