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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: #f8fafc;
  color: #1e293b;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 20px 0;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

header nav a {
  color: white;
  text-decoration: none;
  opacity: 0.9;
}

header nav a:hover {
  opacity: 1;
}

/* Main */
main {
  flex: 1;
  padding: 40px 0;
}

main h2 {
  margin-bottom: 30px;
  font-size: 1.75rem;
  color: #334155;
}

/* Reports Grid */
.reports-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
}

.report-card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s, box-shadow 0.2s;
}

.report-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

.report-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.report-type {
  background: #e0e7ff;
  color: #4338ca;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.report-date {
  color: #94a3b8;
  font-size: 0.875rem;
}

.report-card h3 {
  margin-bottom: 8px;
}

.report-card h3 a {
  color: #1e293b;
  text-decoration: none;
}

.report-card h3 a:hover {
  color: #667eea;
}

.summary {
  color: #64748b;
  font-size: 0.875rem;
  margin-bottom: 8px;
}

.period {
  color: #94a3b8;
  font-size: 0.8rem;
}

.report-actions {
  margin-top: 16px;
  display: flex;
  gap: 8px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  background: #667eea;
  color: white;
}

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

.btn-secondary {
  background: #e2e8f0;
  color: #475569;
}

.btn-secondary:hover {
  background: #cbd5e1;
}

.btn-danger {
  background: #fee2e2;
  color: #dc2626;
}

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

/* Report View */
.report-view {
  background: white;
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.report-meta {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.report-toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid #e2e8f0;
}

.report-content {
  line-height: 1.7;
}

.report-content h1, .report-content h2, .report-content h3 {
  color: #334155;
  margin: 24px 0 16px;
}

.report-content h1:first-child, .report-content h2:first-child {
  margin-top: 0;
}

.report-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.report-content th, .report-content td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

.report-content th {
  background: #f8fafc;
  font-weight: 600;
  color: #475569;
}

.report-content tr:hover {
  background: #f8fafc;
}

.report-content .amount {
  text-align: right;
  font-family: 'SF Mono', 'Consolas', monospace;
}

.report-content .total {
  font-weight: 700;
  background: #f0f9ff;
}

.report-content .negative {
  color: #dc2626;
}

.report-content .positive {
  color: #16a34a;
}

.report-content .section-total {
  font-weight: 600;
  border-top: 2px solid #cbd5e1;
}

/* Empty State */
.empty {
  text-align: center;
  color: #94a3b8;
  padding: 60px 20px;
  background: white;
  border-radius: 12px;
  font-size: 1.125rem;
}

/* Footer */
footer {
  background: #1e293b;
  color: #94a3b8;
  padding: 20px 0;
  text-align: center;
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 640px) {
  .reports-grid {
    grid-template-columns: 1fr;
  }
  
  .report-toolbar {
    flex-wrap: wrap;
  }
  
  .report-meta {
    flex-direction: column;
    align-items: flex-start;
  }
}