body {
  background: #f6f8fa;
  color: #222;
  transition: background 0.2s, color 0.2s;
}
body.dark {
  background: #181c24;
  color: #f6f8fa;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  color: #222;
  padding: 0.7rem 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  border-radius: 0 0 14px 14px;
  min-height: 56px;
  position: sticky;
  top: 0;
  z-index: 10;
}
body.dark .navbar {
  background: #23272f;
  color: #f6f8fa;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}
.navbar-brand {
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: 0.5px;
  margin-right: 1.2rem;
}
.navbar-title {
  font-size: 1.08rem;
  opacity: 0.85;
  flex: 1;
  text-align: center;
  font-weight: 500;
  letter-spacing: 0.2px;
}
.theme-toggle {
  background: none;
  border: none;
  font-size: 1.08rem;
  cursor: pointer;
  color: inherit;
  outline: none;
  margin-left: 0;
  margin-right: 0;
  padding: 0.13rem 0.45rem;
  border-radius: 50%;
  transition: background 0.18s, color 0.18s;
  min-width: 32px;
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: none;
}
.theme-toggle:active {
  background: #e6e6e6;
}
body.dark .theme-toggle:active {
  background: #2d3440;
}
.container {
  max-width: 420px;
  margin: 2rem auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0,0,0,0.07);
  padding: 2rem 1.5rem;
}
body.dark .container {
  background: #23272f;
  box-shadow: 0 2px 16px rgba(0,0,0,0.18);
}
input, button {
  font-size: 1rem;
  padding: 0.6rem;
  border-radius: 6px;
  border: 1px solid #d1d5db;
  margin-bottom: 1rem;
  width: 100%;
  box-sizing: border-box;
}
body.dark input, body.dark button {
  background: #23272f;
  color: #f6f8fa;
  border: 1px solid #444;
}
button[type="submit"] {
  background: #2d7ff9;
  color: #fff;
  border: none;
  font-weight: 500;
  margin-bottom: 0;
  transition: background 0.2s;
}
button[type="submit"]:hover {
  background: #1a5fd0;
}
.summary {
  margin: 1.2rem 0 0.7rem 0;
  font-size: 1.1rem;
  font-weight: 500;
  text-align: right;
}
#expense-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
#expense-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.7rem 0.2rem;
  border-bottom: 1px solid #ececec;
}
body.dark #expense-list li {
  border-bottom: 1px solid #333;
}
body {
    background: #f4f6fb;
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 400px;
    margin: 40px auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    padding: 32px 24px 24px 24px;
}
h1 {
    text-align: center;
    color: #2d3a4a;
    margin-bottom: 24px;
    font-size: 2rem;
    font-weight: 600;
}
#expense-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}
#expense-form input, #expense-form button {
    padding: 10px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 1rem;
}
#expense-form button {
    background: #3b82f6;
    color: #fff;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}
#expense-form button:hover {
    background: #2563eb;
}
.summary {
    text-align: right;
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: #374151;
}
#expense-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
#expense-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #f1f1f1;
    font-size: 1rem;
}
#expense-list li:last-child {
    border-bottom: none;
}
.expense-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.expense-name {
    color: #1e293b;
    font-weight: 500;
}
.expense-date {
    color: #64748b;
    font-size: 0.9em;
}
.expense-amount {
    color: #ef4444;
    font-weight: 600;
    margin-right: 16px;
}
.delete-btn {
    background: none;
    border: none;
    color: #ef4444;
    font-size: 1.1em;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background 0.15s;
}
.delete-btn:hover {
    background: #fee2e2;
}