:root {
  --app-primary: #0f766e;
  --app-primary-dark: #115e59;
  --app-navy: #0b2f4a;
  --app-blue: #0f3d5e;
  --app-accent: #22c1a6;
  --app-bg: #f4f8fa;
  --app-surface: rgba(255,255,255,.94);
  --app-border: rgba(15,61,94,.12);
  --app-text: #102a3a;
  --app-muted: #607381;
  --app-shadow: 0 18px 45px rgba(11,47,74,.10);
  --app-shadow-hover: 0 24px 60px rgba(11,47,74,.16);
  --app-radius: 18px;
}

html { scroll-behavior: smooth; }
body {
  color: var(--app-text) !important;
  background:
    radial-gradient(circle at 12% 10%, rgba(34,193,166,.10), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(15,61,94,.09), transparent 30%),
    linear-gradient(180deg, #f8fbfc 0%, var(--app-bg) 100%) !important;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.brand-gradient {
  background: linear-gradient(135deg, var(--app-primary) 0%, var(--app-blue) 54%, var(--app-navy) 100%) !important;
}

#contentWrapper { max-width: 100%; }
.sidebar {
  border-left: 1px solid var(--app-border);
  background: rgba(255,255,255,.97) !important;
  backdrop-filter: blur(18px);
}
.sidebar-item { border-radius: 14px !important; }
.sidebar-item:hover,
.sidebar-item.active {
  background: linear-gradient(90deg, rgba(15,118,110,.14), rgba(15,61,94,.04)) !important;
  color: var(--app-primary) !important;
  border-right-color: var(--app-primary) !important;
}

.card, .bg-white.rounded-2xl, .bg-white.rounded-3xl {
  background: var(--app-surface) !important;
  border: 1px solid var(--app-border) !important;
  box-shadow: var(--app-shadow) !important;
  border-radius: var(--app-radius) !important;
  backdrop-filter: blur(14px);
}
.card, .student-item, .search-result-item { transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
.card:hover { box-shadow: var(--app-shadow-hover) !important; }

input:not([type="radio"]):not([type="checkbox"]), select, textarea, .form-control, .student-search {
  border: 1px solid rgba(15,61,94,.18) !important;
  background: #fff !important;
  color: var(--app-text) !important;
  border-radius: 12px !important;
  box-shadow: 0 1px 2px rgba(11,47,74,.03);
}
input:focus, select:focus, textarea:focus, .form-control:focus, .student-search:focus {
  outline: none !important;
  border-color: var(--app-primary) !important;
  box-shadow: 0 0 0 4px rgba(15,118,110,.13) !important;
}

.btn, button[type="submit"] { border-radius: 12px !important; font-weight: 800 !important; }
.btn-primary, .btn-info {
  background: linear-gradient(135deg, var(--app-primary), var(--app-blue)) !important;
  border-color: transparent !important;
  color: #fff !important;
}
.btn-success { background: linear-gradient(135deg, #059669, #0f766e) !important; color: #fff !important; }
.btn-danger { background: linear-gradient(135deg, #dc2626, #b91c1c) !important; color: #fff !important; }
.btn:hover, button[type="submit"]:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(11,47,74,.16) !important; }

.table, table { border-collapse: separate; border-spacing: 0; }
table thead th, .table th {
  background: linear-gradient(135deg, var(--app-navy), var(--app-blue)) !important;
  color: #fff !important;
  white-space: nowrap;
}
table tbody tr { background: rgba(255,255,255,.92); }
table tbody tr:hover { background: rgba(34,193,166,.07) !important; }
table td, table th { border-color: var(--app-border) !important; }

.search-results {
  border: 1px solid var(--app-border) !important;
  border-radius: 14px !important;
  box-shadow: 0 22px 45px rgba(11,47,74,.18) !important;
  overflow: hidden;
}
.search-result-item:hover { transform: none !important; background: rgba(15,118,110,.08) !important; }

.grade-save-status { display:block; min-height:18px; margin-top:5px; font-size:11px; font-weight:800; }
.grade-save-status.saving { color:#a16207; }
.grade-save-status.saved { color:#047857; }
.grade-save-status.error { color:#b91c1c; }
.grade-input.is-invalid { border-color:#dc2626 !important; box-shadow:0 0 0 4px rgba(220,38,38,.10) !important; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: #e8f0f3; }
::-webkit-scrollbar-thumb { background: linear-gradient(var(--app-primary), var(--app-blue)); border-radius: 999px; border: 2px solid #e8f0f3; }

@media (max-width: 1023px) {
  #contentWrapper { padding: 16px !important; }
  .card { padding: 18px !important; }
}
@media (max-width: 640px) {
  #contentWrapper { padding: 11px !important; }
  .card { padding: 14px !important; border-radius: 15px !important; }
  .card-header { gap: 8px; flex-wrap: wrap; }
  .btn { min-height: 42px; }
  table { min-width: 720px; }
  input, select, textarea { font-size: 16px !important; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}


.highlighted-grade-row,
.highlighted {
  outline: 3px solid rgba(14, 165, 164, .35) !important;
  box-shadow: 0 0 0 6px rgba(14, 165, 164, .12), 0 18px 38px rgba(15, 23, 42, .12) !important;
  transition: box-shadow .25s ease, outline-color .25s ease;
}

.historical-grade-row {
  background: linear-gradient(90deg, rgba(245, 158, 11, .08), rgba(255,255,255,.94)) !important;
  border-inline-start: 4px solid #f59e0b !important;
}

.grade-input.is-invalid,
input.is-invalid {
  border-color: #dc2626 !important;
  box-shadow: 0 0 0 4px rgba(220, 38, 38, .10) !important;
}

.historical-attendance-row {
  background: linear-gradient(90deg, rgba(245, 158, 11, .08), rgba(255,255,255,.94)) !important;
  border-inline-start-color: #f59e0b !important;
}