:root {
  color-scheme: dark;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: #090d16;
  color: #e2e8f0;
}

.glass-panel {
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(51, 65, 85, 0.65);
}

.glass-card {
  background: rgba(30, 41, 59, 0.55);
  border: 1px solid rgba(71, 85, 105, 0.45);
  transition: all 0.2s ease;
}

.glass-card:hover {
  border-color: rgba(99, 102, 241, 0.55);
  background: rgba(30, 41, 59, 0.8);
}

.tab-btn {
  position: relative;
  transition: all 0.2s ease;
}

.tab-btn.active {
  color: #38bdf8;
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.45);
}

.grade-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 1rem;
  font-weight: 800;
  font-size: 1.5rem;
}

.grade-A {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}
.grade-B {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.4);
}
.grade-C {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}
.grade-D, .grade-F {
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: #0f172a;
}
::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

@media print {
  body {
    background: #ffffff !important;
    color: #0f172a !important;
  }
  .no-print {
    display: none !important;
  }
  .glass-panel, .glass-card {
    background: #ffffff !important;
    border: 1px solid #cbd5e1 !important;
    color: #0f172a !important;
    box-shadow: none !important;
  }
}