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

:root {
  --bg: #0f172a;
  --bg-soft: #1e293b;
  --panel: #1e293b;
  --panel-2: #243044;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --border: #334155;
  --income: #10b981;
  --income-soft: rgba(16, 185, 129, 0.15);
  --expense: #ef4444;
  --expense-soft: rgba(239, 68, 68, 0.15);
  --accent: #6366f1;
  --accent-soft: rgba(99, 102, 241, 0.15);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  --radius: 14px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
  color: var(--text);
  min-height: 100vh;
  padding: 24px 16px;
  line-height: 1.5;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
}

/* ---------- Header ---------- */
.app-header {
  text-align: center;
  margin-bottom: 32px;
}

.app-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-dim);
  margin-top: 6px;
  font-size: 0.95rem;
}

/* ---------- Summary cards ---------- */
.summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
}

.card-label {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-value {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.card.balance .card-value {
  color: var(--accent);
}

.card.income {
  border-left: 4px solid var(--income);
}

.card.income .card-value {
  color: var(--income);
}

.card.expense {
  border-left: 4px solid var(--expense);
}

.card.expense .card-value {
  color: var(--expense);
}

/* ---------- Main grid ---------- */
.main-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 20px;
}

@media (max-width: 860px) {
  .summary {
    grid-template-columns: 1fr;
  }
  .main-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Panels ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.panel h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 16px;
}

/* ---------- Type toggle ---------- */
.type-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg);
  border-radius: 10px;
  padding: 4px;
  margin-bottom: 18px;
  gap: 4px;
}

.type-btn {
  padding: 10px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.type-btn:hover {
  color: var(--text);
}

.type-btn.active[data-type="income"] {
  background: var(--income);
  color: white;
}

.type-btn.active[data-type="expense"] {
  background: var(--expense);
  color: white;
}

/* ---------- Form ---------- */
#transaction-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

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

.form-group label {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-group input,
.form-group select {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  width: 100%;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-group input::placeholder {
  color: var(--text-dim);
  opacity: 0.6;
}

/* Hide number input arrows for cleaner look */
.form-group input[type="number"]::-webkit-outer-spin-button,
.form-group input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.form-group input[type="number"] {
  -moz-appearance: textfield;
}

/* ---------- Add button ---------- */
.btn-add {
  margin-top: 4px;
  padding: 12px;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  color: white;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn-add:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn-add:active {
  transform: translateY(0);
}

/* ---------- List ---------- */
.list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 16px;
}

.list-header h2 {
  margin-bottom: 0;
}

.filter-buttons {
  display: flex;
  gap: 4px;
  background: var(--bg);
  border-radius: 8px;
  padding: 4px;
}

.filter-btn {
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover {
  color: var(--text);
}

.filter-btn.active {
  background: var(--accent);
  color: white;
}

.transaction-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 520px;
  overflow-y: auto;
  padding-right: 4px;
}

/* Scrollbar styling */
.transaction-list::-webkit-scrollbar {
  width: 6px;
}
.transaction-list::-webkit-scrollbar-track {
  background: transparent;
}
.transaction-list::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.transaction-item {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: transform 0.15s ease, border-color 0.15s ease;
  animation: slideIn 0.2s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.transaction-item:hover {
  transform: translateX(2px);
  border-color: var(--accent);
}

.txn-icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.txn-icon.income {
  background: var(--income-soft);
}

.txn-icon.expense {
  background: var(--expense-soft);
}

.txn-info {
  min-width: 0;
}

.txn-desc {
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.txn-meta {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 2px;
}

.txn-amount {
  font-weight: 700;
  font-size: 1rem;
  white-space: nowrap;
}

.txn-amount.income {
  color: var(--income);
}

.txn-amount.expense {
  color: var(--expense);
}

.txn-delete {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 1.1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.txn-delete:hover {
  background: var(--expense-soft);
  color: var(--expense);
}

.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 40px 20px;
  font-size: 0.95rem;
}

.empty-state.hidden {
  display: none;
}