/* =========================================
   Personal Finance Tracker — styles.css
   ========================================= */

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #1f2937;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --income: #10b981;
  --income-bg: #ecfdf5;
  --expense: #ef4444;
  --expense-bg: #fef2f2;
  --balance: #2563eb;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --radius-sm: 8px;

  /* Pie chart palette */
  --c1: #4f46e5;
  --c2: #10b981;
  --c3: #f59e0b;
  --c4: #ef4444;
  --c5: #8b5cf6;
  --c6: #06b6d4;
  --c7: #ec4899;
  --c8: #84cc16;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  padding: 24px 16px;
}

.container {
  max-width: 1040px;
  margin: 0 auto;
}

/* ---------- Header ---------- */
header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.header-main h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.header-right {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 220px;
}

.currency-picker {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.currency-picker label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.currency-picker select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.currency-picker select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.rates-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.rates-status {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rates-status.error { color: var(--expense); }
.rates-status.fallback { color: #b45309; }

.btn-link {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  padding: 2px 4px;
  font-family: inherit;
}

.btn-link:hover { text-decoration: underline; }
.btn-link:disabled { color: var(--text-muted); cursor: not-allowed; }

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

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 4px solid var(--border);
}

.card.balance { border-left-color: var(--balance); }
.card.income  { border-left-color: var(--income); }
.card.expense { border-left-color: var(--expense); }

.card-label {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-amount {
  font-size: 1.6rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.card.income  .card-amount { color: var(--income); }
.card.expense .card-amount { color: var(--expense); }
.card.balance .card-amount { color: var(--balance); }

.card-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
  min-height: 1em;
  font-variant-numeric: tabular-nums;
}

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

.panel h2 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  font-weight: 600;
}

.panel-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: -8px;
  margin-bottom: 14px;
}

/* ---------- Monthly panel ---------- */
.monthly-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.month-tag {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.month-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.month-stats > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.stat-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  font-weight: 600;
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stat-value.income  { color: var(--income); }
.stat-value.expense { color: var(--expense); }
.stat-value.balance { color: var(--balance); }

.month-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
}

.month-list li {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  padding: 8px 12px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  align-items: center;
}

.month-list .month-name { font-weight: 500; }
.month-list .month-expense {
  color: var(--expense);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.month-list .month-income {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.month-list li.current {
  background: rgba(79, 70, 229, 0.08);
  border-left: 3px solid var(--primary);
  padding-left: 9px;
}

/* ---------- Form ---------- */
.form-row {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: 12px;
  margin-bottom: 12px;
}

.form-row.two-col-form {
  grid-template-columns: 1fr 2fr;
}

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

.form-group label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.form-group input,
.form-group select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
  width: 100%;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

/* Amount + currency combined input */
.amount-group {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.amount-group:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.amount-prefix {
  display: flex;
  align-items: center;
  padding: 0 12px;
  background: var(--bg);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  border-right: 1px solid var(--border);
  min-width: 36px;
  justify-content: center;
}

.amount-group input {
  flex: 1;
  border: none;
  border-radius: 0;
  padding: 10px 12px;
  font-size: 0.95rem;
  min-width: 0;
}

.amount-group input:focus {
  outline: none;
  box-shadow: none;
}

.tx-currency-select {
  border: none;
  border-left: 1px solid var(--border);
  border-radius: 0;
  background: var(--bg);
  padding: 0 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  min-width: 80px;
  max-width: 110px;
}

.tx-currency-select:focus { outline: none; background: #eef2ff; }

.conversion-preview {
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 1.2em;
  margin-top: 4px;
  margin-bottom: 4px;
  font-variant-numeric: tabular-nums;
}

.conversion-preview strong { color: var(--primary); }

.btn-primary {
  margin-top: 6px;
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.05s;
}

.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: translateY(1px); }

.btn-secondary {
  background: var(--surface);
  color: var(--primary);
  border: 1px solid var(--border);
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.btn-secondary:hover {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.05);
}

.error {
  color: var(--expense);
  font-size: 0.85rem;
  margin-top: 8px;
  min-height: 1em;
}

/* ---------- Two-column layout ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 24px;
  margin-bottom: 24px;
}

.two-col .panel { margin-bottom: 0; }

/* ---------- Chart ---------- */
.chart-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  min-height: 240px;
  justify-content: center;
}

.chart-container svg {
  width: 100%;
  max-width: 240px;
  height: auto;
}

.chart-slice {
  transition: transform 0.2s, opacity 0.2s;
  transform-origin: center;
  cursor: pointer;
}

.chart-slice:hover { opacity: 0.85; transform: scale(1.03); }

.chart-legend {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.chart-legend-item {
  display: grid;
  grid-template-columns: 12px 1fr auto auto;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
  padding: 4px 0;
}

.chart-swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.chart-cat {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chart-amt {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.chart-pct {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  min-width: 40px;
  text-align: right;
}

.chart-empty {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 20px;
}

/* ---------- History ---------- */
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

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

.history-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

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

.filter-btn {
  background: transparent;
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
  font-family: inherit;
}

.filter-btn:hover { color: var(--text); }
.filter-btn.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow);
}

.transaction-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 480px;
  overflow-y: auto;
}

.transaction {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--border);
  transition: transform 0.1s, box-shadow 0.15s;
}

.transaction:hover {
  transform: translateX(2px);
  box-shadow: var(--shadow);
}

.transaction.income  { border-left-color: var(--income); }
.transaction.expense { border-left-color: var(--expense); }

.tx-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  font-weight: 700;
}

.transaction.income  .tx-icon { background: var(--income-bg);  color: var(--income); }
.transaction.expense .tx-icon { background: var(--expense-bg); color: var(--expense); }

.tx-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 1px;
}

.tx-category {
  font-weight: 600;
  font-size: 0.92rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tx-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tx-description {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
}

.tx-amounts {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1px;
}

.tx-amount {
  font-weight: 700;
  font-size: 0.92rem;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.transaction.income  .tx-amount { color: var(--income); }
.transaction.expense .tx-amount { color: var(--expense); }

.tx-amount-converted {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.delete-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.2rem;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s;
}

.delete-btn:hover {
  background: var(--expense-bg);
  color: var(--expense);
}

.empty {
  text-align: center;
  color: var(--text-muted);
  padding: 30px 0;
  font-size: 0.95rem;
}

/* ---------- Footer ---------- */
footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

footer code {
  background: var(--surface);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.78rem;
}

.footer-note {
  font-size: 0.72rem;
  opacity: 0.8;
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .two-col { grid-template-columns: 1fr; }
  .monthly-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr 1fr; }
  .form-row.two-col-form { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  body { padding: 16px 10px; }
  header { flex-direction: column; }
  .header-right { width: 100%; }
  .summary { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .form-row.two-col-form { grid-template-columns: 1fr; }
  .transaction { grid-template-columns: auto 1fr auto; }
  .tx-description { max-width: 140px; }
  .month-stats { grid-template-columns: 1fr 1fr; }
  .history-actions { width: 100%; }
  .filter-buttons { flex: 1; justify-content: space-between; }
  .filter-btn { flex: 1; }
  header h1 { font-size: 1.5rem; }
  .card-amount { font-size: 1.4rem; }
}