/* Professional, responsive styling for Expense Tracker */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg: #edf3ff;
  --bg-strong: #dfeaff;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-strong: #ffffff;
  --muted: #5f6f8d;
  --text: #101828;
  --border: rgba(148, 163, 184, 0.28);
  --accent-600: #1d4ed8;
  --accent-500: #2563eb;
  --accent-400: #60a5fa;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --success: #16a34a;
  --success-soft: rgba(22, 163, 74, 0.12);
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.12);
  --warning: #f59e0b;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
  --shadow-soft: 0 10px 24px rgba(15, 23, 42, 0.06);
}

* { box-sizing: border-box; }

html, body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  overflow-x: hidden;
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background:
    radial-gradient(circle at top left, rgba(96, 165, 250, 0.15), transparent 30%),
    linear-gradient(135deg, var(--bg) 0%, #f8fbff 48%, #edf2ff 100%);
  color: var(--text);
}

body {
  padding: 24px;
}

img, canvas {
  max-width: 100%;
}

button, input, select {
  font: inherit;
}

button {
  cursor: pointer;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 12px 0 28px;
}

.header {
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent-500);
}

.header h1 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.05em;
  font-size: clamp(2rem, 4vw, 3rem);
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.sidebar,
.main-column {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--surface);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow-soft);
  padding: 20px;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.section-head h2 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.card-header {
  margin-bottom: 16px;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--muted);
}

.summary {
  display: grid;
  gap: 12px;
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.8), rgba(239,246,255,0.9));
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.summary-item label {
  font-size: 0.78rem;
  color: var(--muted);
  font-weight: 600;
}

.summary-item div {
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.04em;
}

.balance-item {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.12), rgba(96, 165, 250, 0.14));
  border-color: rgba(37, 99, 235, 0.12);
}

.expense-item {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.08), rgba(254, 226, 226, 0.9));
  border-color: rgba(239, 68, 68, 0.12);
}

#balance, #income, #expense {
  font-variant-numeric: tabular-nums;
}

.quick-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quick-actions button,
.filter-btn,
.form-actions button,
.actions button {
  border: 0;
  border-radius: 12px;
  padding: 0.8rem 1rem;
  font-weight: 700;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.quick-actions button:not(.secondary),
.form-actions button,
.filter-btn {
  background: linear-gradient(135deg, var(--accent-500), var(--accent-600));
  color: #fff;
  box-shadow: 0 10px 18px rgba(37, 99, 235, 0.2);
}

.quick-actions .secondary,
.filter-btn.subtle,
.clear-btn {
  background: rgba(255,255,255,0.9);
  color: var(--accent-600);
  border: 1px solid rgba(37, 99, 235, 0.12);
  box-shadow: none;
}

.quick-actions button:hover,
.filter-btn:hover,
.form-actions button:hover,
.actions button:hover {
  transform: translateY(-1px);
}

.quick-actions button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.import-label {
  display: block;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}

.form-row label {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 600;
}

.form-row input,
.form-row select,
.filters input,
.filters select {
  width: 100%;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.86);
  color: var(--text);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-row input:focus,
.form-row select:focus,
.filters input:focus,
.filters select:focus {
  border-color: rgba(37, 99, 235, 0.5);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
  outline: none;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}

.clear-btn {
  background: rgba(241, 245, 249, 0.9);
  color: var(--text);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.filters > * {
  flex: 1 1 160px;
}

.date-range {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.8);
  border-radius: 12px;
}

.date-range span {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--muted);
}

.date-range input {
  border: none;
  background: transparent;
  flex: 1;
  min-width: 0;
  padding: 0.8rem 0;
}

.filter-btn {
  flex: 0 0 auto;
  min-width: 90px;
}

.table-wrap {
  overflow-x: auto;
  border-radius: 16px;
  border: 1px solid rgba(148, 163, 184, 0.2);
}

#transactionTable {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.45);
}

#transactionTable th,
#transactionTable td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
}

#transactionTable th {
  background: rgba(248, 250, 252, 0.9);
  color: var(--muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
}

#transactionTable td {
  font-size: 0.95rem;
}

#transactionTable tbody tr {
  background: rgba(255,255,255,0.22);
}

#transactionTable tbody tr:hover {
  background: rgba(239, 246, 255, 0.54);
}

.numeric {
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.actions button {
  padding: 0.55rem 0.8rem;
  font-size: 0.82rem;
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(148,163,184,0.18);
  color: var(--text);
  box-shadow: none;
}

.actions button.delete {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: rgba(239, 68, 68, 0.12);
}

.charts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.chart-card {
  position: relative;
  height: 280px;
  padding: 12px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255,255,255,0.9), rgba(239,246,255,0.8));
  border: 1px solid var(--border);
}

.chart-card canvas {
  width: 100% !important;
  height: 100% !important;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  min-width: 220px;
  max-width: 320px;
  background: rgba(15, 23, 42, 0.92);
  color: #fff;
  border-radius: 14px;
  padding: 12px 16px;
  box-shadow: var(--shadow);
  font-weight: 600;
}

.small {
  color: var(--muted);
  text-align: center;
}

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.2);
  outline-offset: 2px;
}

@media (max-width: 980px) {
  .app-grid {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  body {
    padding: 12px;
  }

  .card {
    padding: 16px;
    border-radius: 18px;
  }

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

  .filters {
    flex-direction: column;
    align-items: stretch;
  }

  .filters > * {
    width: 100%;
    flex-basis: 100%;
  }

  .date-range {
    justify-content: space-between;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions button,
  .filter-btn {
    width: 100%;
  }

  .quick-actions {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .quick-actions > * {
    flex: 1 1 calc(50% - 8px);
  }

  #transactionTable thead {
    display: none;
  }

  #transactionTable,
  #transactionTable tbody,
  #transactionTable tr,
  #transactionTable td {
    display: block;
    width: 100%;
  }

  #transactionTable tbody tr {
    padding: 0 0 10px;
    border: 1px solid rgba(148,163,184,0.18);
    border-radius: 16px;
    margin-bottom: 12px;
    background: rgba(255,255,255,0.55);
  }

  #transactionTable td {
    border-bottom: 1px solid rgba(148,163,184,0.12);
    padding: 12px 16px;
  }

  #transactionTable td:last-child {
    border-bottom: none;
  }

  #transactionTable td::before {
    content: attr(data-label);
    display: block;
    font-size: 0.72rem;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
    font-weight: 700;
  }

  .actions {
    flex-wrap: wrap;
  }

  .actions button {
    flex: 1 1 calc(50% - 8px);
  }
}