/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: #f0f2f5;
  color: #1a1a2e;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
.app-header {
  background: linear-gradient(135deg, #2d6a4f 0%, #1b4332 100%);
  color: #ffffff;
  padding: 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.month-selector-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
}

.month-selector-wrap label {
  font-weight: 600;
  opacity: 0.85;
}

#monthSelector {
  padding: 6px 10px;
  border: 2px solid rgba(255,255,255,0.4);
  border-radius: 8px;
  background: rgba(255,255,255,0.15);
  color: #ffffff;
  font-size: 0.9rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

#monthSelector:focus {
  border-color: rgba(255,255,255,0.8);
}

/* ===== MAIN LAYOUT ===== */
.app-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  flex: 1;
}

/* ===== CARD ===== */
.card {
  background: #ffffff;
  border-radius: 16px;
  padding: 28px 32px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}

.card h2 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #1b4332;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #2d6a4f;
  margin-bottom: 14px;
}

.subtitle {
  font-size: 0.8rem;
  font-weight: 400;
  color: #6b7280;
}

/* ===== FORM ===== */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

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

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #374151;
}

.required {
  color: #ef4444;
}

.form-group input,
.form-group select {
  padding: 10px 12px;
  border: 1.5px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.95rem;
  color: #1a1a2e;
  background: #f9fafb;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.form-group input:focus,
.form-group select:focus {
  border-color: #2d6a4f;
  box-shadow: 0 0 0 3px rgba(45,106,79,0.12);
  background: #ffffff;
}

.form-group input.invalid {
  border-color: #ef4444;
}

.field-error {
  font-size: 0.78rem;
  color: #ef4444;
  min-height: 16px;
}

.form-success {
  margin-top: 10px;
  font-size: 0.85rem;
  color: #2d6a4f;
  font-weight: 600;
  min-height: 20px;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
  outline: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: #2d6a4f;
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(45,106,79,0.25);
}

.btn-primary:hover {
  background: #1b4332;
  box-shadow: 0 4px 12px rgba(45,106,79,0.35);
}

.btn-secondary {
  background: #e9f5ee;
  color: #1b4332;
  border: 1.5px solid #a7d7b8;
}

.btn-secondary:hover {
  background: #d1ead9;
}

.btn-danger {
  background: #fee2e2;
  color: #b91c1c;
  border: none;
  padding: 5px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-danger:hover {
  background: #fca5a5;
}

/* ===== BUDGET GRID ===== */
.budget-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.budget-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.budget-item label {
  font-size: 0.83rem;
  font-weight: 600;
  color: #374151;
  display: flex;
  align-items: center;
  gap: 6px;
}

.budget-item input {
  padding: 9px 12px;
  border: 1.5px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.95rem;
  color: #1a1a2e;
  background: #f9fafb;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

.budget-item input:focus {
  border-color: #2d6a4f;
  box-shadow: 0 0 0 3px rgba(45,106,79,0.12);
  background: #ffffff;
}

/* ===== SUMMARY BAR ===== */
.summary-block {
  background: #f0f9f4;
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 24px;
  border: 1px solid #d1ead9;
}

.summary-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  font-weight: 600;
  color: #374151;
  margin-bottom: 10px;
}

.progress-bar-wrap {
  background: #e5e7eb;
  border-radius: 999px;
  height: 14px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-bar {
  height: 100%;
  border-radius: 999px;
  width: 0%;
  background: #2d6a4f;
  transition: width 0.5s ease, background 0.3s;
}

.progress-bar.amber {
  background: #f59e0b;
}

.progress-bar.red {
  background: #ef4444;
}

.summary-pct {
  font-size: 0.82rem;
  color: #6b7280;
  text-align: right;
}

/* ===== CHARTS ===== */
.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

.chart-card {
  background: #f9fafb;
  border-radius: 12px;
  padding: 20px;
  border: 1px solid #e5e7eb;
  position: relative;
}

.chart-wrap {
  position: relative;
  height: 240px;
}

.empty-chart {
  display: none;
  text-align: center;
  color: #9ca3af;
  font-size: 0.88rem;
  padding: 40px 0;
}

/* ===== EXPENSE LIST ===== */
.expense-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.expense-list-header h3 {
  margin-bottom: 0;
}

.list-controls {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.list-controls input,
.list-controls select {
  padding: 7px 12px;
  border: 1.5px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.85rem;
  color: #1a1a2e;
  background: #f9fafb;
  outline: none;
  transition: border-color 0.2s;
}

.list-controls input:focus,
.list-controls select:focus {
  border-color: #2d6a4f;
}

.table-wrap {
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid #e5e7eb;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead tr {
  background: #1b4332;
  color: #ffffff;
}

thead th {
  padding: 12px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

tbody tr {
  border-bottom: 1px solid #f0f0f0;
  transition: background 0.15s;
}

tbody tr:last-child {
  border-bottom: none;
}

tbody tr:hover {
  background: #f0f9f4;
}

tbody td {
  padding: 11px 14px;
  vertical-align: middle;
}

.empty-state {
  display: none;
  text-align: center;
  padding: 40px 20px;
  color: #9ca3af;
  font-size: 0.95rem;
}

/* ===== CATEGORY BADGES ===== */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge-Food          { background: #fef3c7; color: #92400e; }
.badge-Transport     { background: #dbeafe; color: #1e40af; }
.badge-Housing       { background: #ede9fe; color: #5b21b6; }
.badge-Entertainment { background: #fce7f3; color: #9d174d; }
.badge-Health        { background: #d1fae5; color: #065f46; }
.badge-Shopping      { background: #ffedd5; color: #9a3412; }
.badge-Other         { background: #f3f4f6; color: #374151; }

/* ===== FOOTER ===== */
.app-footer {
  text-align: center;
  padding: 18px 24px;
  font-size: 0.8rem;
  color: #9ca3af;
  border-top: 1px solid #e5e7eb;
  background: #ffffff;
  margin-top: auto;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .charts-row {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 600px) {
  .app-main {
    padding: 16px 12px;
    gap: 16px;
  }

  .card {
    padding: 20px 16px;
  }

  .header-inner {
    padding: 12px 16px;
  }

  .app-header h1 {
    font-size: 1.2rem;
  }

  .expense-list-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .list-controls {
    width: 100%;
  }

  .list-controls input,
  .list-controls select {
    flex: 1;
    min-width: 0;
  }

  thead th:nth-child(2) {
    display: none;
  }

  tbody td:nth-child(2) {
    display: none;
  }

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

@media (max-width: 380px) {
  .budget-grid {
    grid-template-columns: 1fr;
  }
}