html {
  color-scheme: light dark;
  --primary: light-dark(#800000, #C85A5A);
  --secondary: light-dark(#D2B48C, #D4A574);
  --bg: light-dark(#F5F5F5, #1E1E1E);
  --text: light-dark(#404040, #E8E8E8);
  --container: light-dark(#FFFFFF, #2D2D2D);
  --border: light-dark(#D0D0D0, #4A4A4A);
  --highlight: light-dark(#F0E6D2, #3D2A2A);
  --nav: light-dark(#E0E0E0, #3A3A3A);
  --success: light-dark(#606060, #70B070);
  --warning: light-dark(#D2B48C, #D2B48C);
  --danger: light-dark(#800000, #C85A5A);
}
body {
  font-family: system-ui, -apple-system, sans-serif;
  font-size: 1.1rem;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
  margin: 0;
}
@media (max-width: 768px) {
  body {
    font-size: 1.5rem;
  }
}
@media (min-width: 769px) {
  body {
    font-size: 1.25rem;
  }
}
img, svg, video {
  max-width: 100%;
  display: block;
}
main, .container {
  max-width: min(70ch, 100% - 4rem);
  margin-inline: auto;
  padding-block: 2rem;
}
a {
  color: var(--primary);
  text-decoration: none;
  &:hover { 
    opacity: 0.8;
    text-decoration: underline;
  }
}
button, input, select, textarea {
  font: inherit;
  color: inherit;
}
button, .btn, .btn-primary, .success-btn, .add-transaction-btn {
  background: var(--primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  display: inline-block;
  &:hover { 
    opacity: 0.9;
  }
}
.btn-secondary {
  background: var(--secondary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  &:hover { 
    opacity: 0.9;
  }
}
.warning-btn {
  background: var(--warning);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  &:hover { 
    opacity: 0.9;
  }
}
.danger-btn {
  background: var(--danger);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  &:hover { 
    opacity: 0.9;
  }
}
.enable-btn {
  background: var(--success);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  &:hover { 
    opacity: 0.9;
  }
}
.edit-btn {
  background: var(--secondary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  &:hover { 
    opacity: 0.9;
  }
}
input[type="text"],
input[type="number"],
input[type="email"],
input[type="date"],
select,
textarea {
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 0.25rem;
  background: var(--container);
}
table {
  width: 100%;
  border-collapse: collapse;
  th, td {
    padding: 0.5rem;
    border: 1px solid var(--border);
  }
  th { 
    background: var(--highlight);
  }
}
.header {
  margin-bottom: 2rem;
  h1 {
    margin: 0 0 1rem 0;
  }
}
.nav-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.form-row {
  margin-bottom: 1rem;
  label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
  }
  input, select, textarea {
    width: 100%;
  }
}
.error-page {
  text-align: center;
  padding: 2rem;
  .error-message {
    color: var(--danger);
    font-size: 1.2rem;
    margin: 2rem 0;
  }
  .back-button {
    display: inline-block;
    margin-top: 1rem;
  }
}