* {
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
  margin: 0;
  padding: 0;
  transition: all 0.3s ease;
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: #333;
}

.container {
  background: #fff;
  padding: 2rem;
  border-radius: 20px;
  width: 90%;
  max-width: 480px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  position: relative;
}

h1 {
  text-align: center;
  margin-bottom: 1.5rem;
  font-size: 1.9rem;
  font-weight: 600;
}

.mode-toggle {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin-bottom: 1rem;
  gap: 0.5rem;
  font-weight: 500;
}

.switch {
  position: relative;
  display: inline-block;
  width: 50px;
  height: 24px;
}

.switch input {
  display: none;
}

.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: #ccc;
  border-radius: 34px;
  transition: background-color 0.4s;
}

.slider::before {
  content: "";
  position: absolute;
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: #fff;
  border-radius: 50%;
  transition: transform 0.4s;
}

input:checked + .slider {
  background-color: #6c63ff;
}

input:checked + .slider::before {
  transform: translateX(26px);
}

.input-section {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.input-section input,
.input-section select {
  padding: 0.8rem 1rem;
  border-radius: 12px;
  border: 1px solid #ccc;
  font-size: 1rem;
  background: #fff;
  color: inherit;
  outline: none;
}

#date {
  color: #dbdada;
  font-family: inherit;
}

.input-section button {
  padding: 0.8rem 1rem;
  border-radius: 12px;
  border: none;
  background: #764ba2;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 0.6rem;
  align-self: flex-end;
  box-shadow: 0 5px 15px rgba(118, 75, 162, 0.3);
}

.input-section button:hover {
  background: #667eea;
  transform: translateY(-2px) scale(1.03);
}

.list-section {
  margin-top: 1.5rem;
}

.list-section h2 {
  text-align: center;
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
}

#search {
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: 12px;
  border: 1px solid #ccc;
  margin-bottom: 1rem;
  outline: none;
  font-size: 1rem;
}

#expense-list {
  list-style: none;
  padding: 0;
  max-height: 220px;
  overflow-y: auto;
}

#expense-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #f7f7ff;
  margin-bottom: 0.6rem;
  padding: 0.8rem 1rem;
  border-radius: 12px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
  animation: fadeSlideIn 0.4s forwards;
}

.date {
  font-size: 0.8rem;
  font-weight: 500;
  background: rgba(108, 99, 255, 0.15);
  color: #4b3fad;
  padding: 4px 10px;
  border-radius: 8px;
  margin-left: 8px;
  display: inline-block;
}

/* 🌙 Dark mode fix */
body.dark .date {
  background: rgba(108, 99, 255, 0.25);
  color: #dcd6ff;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.buttons {
  display: flex;
  gap: 0.3rem;
}

.buttons button {
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  font-size: 0.8rem;
  transition: all 0.2s ease;
}

.buttons button.delete {
  background: #ff6b6b;
  color: #fff;
}

.buttons button.edit {
  background: #339af0;
  color: #fff;
}

.buttons button:hover {
  transform: scale(1.1);
  opacity: 0.85;
}

.result-section {
  text-align: center;
  margin-top: 2rem;
}

.result-section h2 {
  margin-bottom: 0.8rem;
}

.result-section button {
  padding: 0.8rem 1.5rem;
  border-radius: 12px;
  border: none;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  margin: 0.3rem;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
}

#calculate-btn {
  background: #ff6b6b;
}

#calculate-btn:hover {
  background: #fa5252;
  transform: scale(1.05);
}

#reset-btn {
  background: #6c757d;
}

#reset-btn:hover {
  background: #495057;
  transform: scale(1.05);
}

#export-btn {
  background: #51cf66;
}

#export-btn:hover {
  background: #40c057;
  transform: scale(1.05);
}

#pdf-btn {
  background: #6c63ff;
}

#pdf-btn:hover {
  background: #574ae2;
  transform: scale(1.05);
}

canvas {
  max-width: 100%;
  margin-top: 1rem;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

#toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: #6c63ff;
  color: #fff;
  padding: 10px 20px;
  border-radius: 15px;
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.5s ease;
  z-index: 10;
}

#toast.show {
  opacity: 1;
  transform: translateY(0);
}

body.dark {
  background: #121212;
  color: #e0e0e0;
}

body.dark .container {
  background: #1e1e1e;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.5);
}

body.dark input,
body.dark select {
  background: #2b2b2b;
  color: #e0e0e0;
  border: 1px solid #555;
}

body.dark #expense-list li {
  background: #2b2b2b;
  color: #e0e0e0;
}

body,
body * {
  transition: background-color 0.3s ease, color 0.3s ease;
}

@media (max-width: 600px) {
  .container {
    padding: 1.2rem;
  }

  .input-section input,
  .input-section select,
  .input-section button,
  .result-section button {
    width: 100%;
  }
}

#output button {
  margin-top: 1.5rem;
  background: linear-gradient(135deg, #6c63ff, #764ba2);
  color: #fff;
  padding: 0.8rem 1.6rem;
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(108, 99, 255, 0.4);
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

#output button:hover {
  background: linear-gradient(135deg, #5b54d6, #6b3fa0);
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 6px 18px rgba(108, 99, 255, 0.5);
}

#output button:active {
  transform: scale(0.97);
}

#output button::before {
  content: "📋";
  font-size: 1.1rem;
}