*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Segoe UI", sans-serif;
  background: #f7fafc;
  min-height: 100vh;
  padding: 24px;
  color: #2d3748;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ============================================
   HEADER
   ============================================ */
.app-header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: #2d3748;
}

/* ============================================
   SUMMARY CARDS
   ============================================ */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

.summary-card {
  background: #fff;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.summary-card.total {
  background: #667eea;
  color: white;
}

.summary-label {
  font-size: 0.8rem;
  color: #718096;
  margin-bottom: 6px;
}

.summary-card.total .summary-label {
  color: rgba(255, 255, 255, 0.8);
}

.summary-amount {
  font-size: 1.1rem;
  font-weight: 700;
  color: #2d3748;
}

.summary-card.total .summary-amount {
  color: white;
}

/* ============================================
   FORM CARD
   ============================================ */
.form-card {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.form-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: #2d3748;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

label {
  font-size: 0.85rem;
  font-weight: 500;
  color: #4a5568;
}

input,
select {
  padding: 10px 12px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 0.9rem;
  color: #2d3748;
  outline: none;
  transition: border-color 0.2s;
  background: #fff;
}

input:focus,
select:focus {
  border-color: #667eea;
}

input.error,
select.error {
  border-color: #fc8181;
}

.error-msg {
  font-size: 0.85rem;
  color: #e53e3e;
  margin-bottom: 12px;
}

.btn-add {
  width: 100%;
  padding: 12px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-add:hover {
  background: #5a67d8;
}

/* ============================================
   LIST CARD
   ============================================ */
.list-card {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.list-header h2 {
  font-size: 1rem;
  font-weight: 600;
}

.list-header select {
  padding: 6px 10px;
  font-size: 0.8rem;
  border-radius: 6px;
}

.expense-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid #f7fafc;
}

.expense-item:last-child {
  border-bottom: none;
}

.expense-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.expense-emoji {
  font-size: 1.4rem;
}

.expense-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: #2d3748;
}

.expense-meta {
  font-size: 0.75rem;
  color: #a0aec0;
  margin-top: 2px;
}

.expense-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.expense-amount {
  font-size: 0.95rem;
  font-weight: 700;
  color: #2d3748;
}

.btn-delete {
  background: none;
  border: none;
  color: #fc8181;
  cursor: pointer;
  font-size: 1rem;
  padding: 4px;
  transition: color 0.2s;
}

.btn-delete:hover {
  color: #e53e3e;
}

.empty-msg {
  text-align: center;
  color: #a0aec0;
  padding: 20px 0;
  font-size: 0.9rem;
}

/* ============================================
   EXPORT CARD
   ============================================ */
.export-card {
  display: flex;
  gap: 12px;
}

.btn-export,
.btn-import {
  flex: 1;
  padding: 10px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  text-align: center;
  background: #fff;
  color: #4a5568;
  transition: all 0.2s;
}

.btn-export:hover,
.btn-import:hover {
  border-color: #667eea;
  color: #667eea;
}

/* ============================================
   UTILITY
   ============================================ */
.hidden {
  display: none !important;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 480px) {
  body {
    padding: 16px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .summary-grid {
    grid-template-columns: 1fr 1fr;
  }
}