/* System-wide liquid-glass visual layer. Presentation only; no business logic. */
:root {
  --glass-bg: rgba(255, 255, 255, 0.28);
  --glass-strong: rgba(255, 255, 255, 0.42);
  --glass-line: rgba(255, 255, 255, 0.56);
  --glass-shadow: 0 18px 60px rgba(15, 23, 42, 0.12);
  --glass-ink: #0f172a;
  --glass-muted: #334155;
  --glass-accent: linear-gradient(135deg, #7dd3fc 0%, #60a5fa 44%, #4f46e5 100%);
}

* {
  box-sizing: border-box;
  scrollbar-width: thin;
  scrollbar-color: rgba(96, 165, 250, 0.45) transparent;
}

*::selection {
  background: rgba(96, 165, 250, 0.24);
  color: #0f172a;
}

html {
  scroll-behavior: smooth;
}

body {
  background:
    radial-gradient(circle at 8% 0%, rgba(125, 211, 252, 0.15), transparent 30%),
    radial-gradient(circle at 92% 8%, rgba(191, 219, 254, 0.16), transparent 30%),
    linear-gradient(135deg, #f7f9ff 0%, #f5f7fb 48%, #eef2ff 100%);
  color: var(--glass-ink);
  transition: background 240ms ease;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: linear-gradient(120deg, rgba(255,255,255,0.34), transparent 40%, rgba(255,255,255,0.08));
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.app-topbar,
.app-sidebar,
.card,
.modal-content,
.dropdown-menu,
.alert,
.list-group,
.table-responsive,
.accordion-item,
.form-control,
.form-select,
.input-group-text,
.btn-light,
.nav-tabs,
.breadcrumb,
.offcanvas,
.search-results,
.notif-panel,
.login-container,
.student-container,
.toast {
  background: linear-gradient(135deg, rgba(255,255,255,0.54), rgba(255,255,255,0.20)) !important;
  border: 1px solid rgba(255,255,255,0.56) !important;
  box-shadow: var(--glass-shadow);
  backdrop-filter: blur(26px) saturate(140%) brightness(1.06);
  -webkit-backdrop-filter: blur(26px) saturate(140%) brightness(1.06);
}

.app-topbar {
  background: linear-gradient(135deg, rgba(37,99,235,0.74), rgba(96,165,250,0.54)) !important;
  border-bottom: 1px solid rgba(255,255,255,0.38) !important;
  box-shadow: 0 14px 36px rgba(15,23,42,0.10) !important;
  color: #fff !important;
}

.app-topbar .app-brand,
.app-topbar .icon-btn,
.app-topbar .topbar-search,
.app-topbar .topbar-search input,
.app-topbar .topbar-search i,
.app-topbar .user-chip-name {
  color: #fff !important;
}

.app-topbar .topbar-search {
  background: rgba(255,255,255,0.18) !important;
  border: 1px solid rgba(255,255,255,0.34) !important;
}

.app-topbar .topbar-search input::placeholder {
  color: rgba(255,255,255,0.72) !important;
}

.app-sidebar {
  background: linear-gradient(135deg, rgba(255,255,255,0.38), rgba(255,255,255,0.20)) !important;
  border-radius: 0 28px 28px 0 !important;
  box-shadow: 12px 0 40px rgba(15,23,42,0.08) !important;
}

.card {
  border-radius: 24px !important;
  overflow: hidden;
  transition: transform 260ms ease, box-shadow 260ms ease;
}

.card:hover {
  transform: translateY(-4px) scale(1.005);
  box-shadow: 0 24px 70px rgba(15,23,42,0.16);
}

.card-header {
  background: linear-gradient(135deg, rgba(255,255,255,0.42), rgba(255,255,255,0.24)) !important;
  color: var(--glass-ink) !important;
  border: 0 !important;
  border-radius: 22px 22px 0 0 !important;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.card-body {
  background: transparent;
  color: var(--glass-ink);
}

.btn {
  border-radius: 999px !important;
  border: 1px solid rgba(255,255,255,0.38) !important;
  background: rgba(255,255,255,0.24) !important;
  color: var(--glass-ink) !important;
  box-shadow: 0 8px 20px rgba(15,23,42,0.08);
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(255,255,255,0.28), transparent);
  transform: translateX(-120%);
  transition: transform 260ms ease;
}

.btn:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 12px 24px rgba(15,23,42,0.12);
}

.btn:hover::before {
  transform: translateX(120%);
}

.btn-primary {
  background: linear-gradient(135deg, rgba(96,165,250,0.95), rgba(79,70,229,0.95)) !important;
  color: #fff !important;
  border-color: rgba(255,255,255,0.55) !important;
  box-shadow: 0 12px 30px rgba(59,130,246,0.22);
}

.btn-success {
  background: linear-gradient(135deg, rgba(34,197,94,0.92), rgba(5,150,105,0.92)) !important;
  color: #fff !important;
}

.btn-danger {
  background: linear-gradient(135deg, rgba(248,113,113,0.95), rgba(220,38,38,0.95)) !important;
  color: #fff !important;
}

.btn-warning {
  background: linear-gradient(135deg, rgba(250,204,21,0.92), rgba(245,158,11,0.92)) !important;
  color: #111827 !important;
}

.form-control,
.form-select,
.input-group-text,
textarea {
  border-radius: 15px !important;
  border: 1px solid rgba(255,255,255,0.42) !important;
  background: rgba(255,255,255,0.24) !important;
  color: var(--glass-ink) !important;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.35);
}

.form-control::placeholder,
textarea::placeholder {
  color: rgba(15,23,42,0.55) !important;
  opacity: 1;
}

.form-control:focus,
.form-select:focus,
textarea:focus {
  border-color: rgba(59,130,246,0.38) !important;
  box-shadow: 0 0 0 3px rgba(59,130,246,0.14) !important;
  background: rgba(255,255,255,0.32) !important;
}

.table {
  --bs-table-bg: transparent;
  border-radius: 18px;
  overflow: hidden;
}

.table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: linear-gradient(135deg, rgba(255,255,255,0.42), rgba(255,255,255,0.24)) !important;
  color: var(--glass-ink) !important;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.42);
}

.table tbody tr:nth-child(even) {
  background: rgba(255,255,255,0.14);
}

.table tbody tr:hover {
  background: rgba(255,255,255,0.28) !important;
}

.alert {
  border-radius: 18px !important;
  background: rgba(255,255,255,0.24) !important;
  color: var(--glass-ink) !important;
  border: 1px solid rgba(255,255,255,0.36) !important;
}

.side-link {
  border-radius: 14px !important;
  color: var(--glass-ink);
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.side-link:hover {
  background: rgba(255,255,255,0.42) !important;
  box-shadow: 0 8px 20px rgba(15,23,42,0.08);
  transform: translateX(2px);
}

.side-link.active {
  background: linear-gradient(135deg, rgba(96,165,250,0.88), rgba(79,70,229,0.80)) !important;
  color: #fff !important;
  box-shadow: 0 10px 24px rgba(37,99,235,0.18);
}

.modal-content,
dropdown-menu {
  border-radius: 24px !important;
}

.badge {
  border-radius: 999px;
  padding: 0.5em 0.75em;
  background: rgba(255,255,255,0.24) !important;
  color: var(--glass-ink) !important;
  border: 1px solid rgba(255,255,255,0.38) !important;
}

.nav-tabs {
  border-radius: 18px;
  padding: 6px;
}

.nav-tabs .nav-link {
  border-radius: 13px;
  color: var(--glass-muted);
  transition: background 180ms ease, color 180ms ease;
}

.nav-tabs .nav-link.active {
  background: rgba(255,255,255,0.44);
  border-color: transparent;
  color: var(--glass-ink);
}

.login-container,
.student-container {
  background: rgba(255,255,255,0.18) !important;
  border: 1px solid rgba(255,255,255,0.46) !important;
  backdrop-filter: blur(28px) saturate(140%) brightness(1.05);
  -webkit-backdrop-filter: blur(28px) saturate(140%) brightness(1.05);
  box-shadow: 0 28px 80px rgba(15,23,42,0.16) !important;
  border-radius: 28px !important;
  color: var(--glass-ink);
}

.login-container {
  overflow: hidden;
}

.toast {
  border-radius: 18px !important;
  border: 1px solid rgba(255,255,255,0.44) !important;
  box-shadow: 0 14px 40px rgba(15,23,42,0.16);
  animation: slideIn 220ms ease;
}

.loading-spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 80px;
}

.loading-spinner .spinner-border {
  width: 2rem;
  height: 2rem;
  border-width: 0.2em;
  color: #60a5fa;
}

.attendance-page,
.attendance-page *,
.analysis-page,
.analysis-page * {
  color: var(--glass-ink);
}

.attendance-page .text-muted,
.analysis-page .text-muted {
  color: var(--glass-muted) !important;
  font-weight: 600;
}

.attendance-page .table,
.analysis-page .table {
  color: var(--glass-ink) !important;
  background: rgba(255,255,255,0.20) !important;
}

.attendance-page .table thead th,
.analysis-page .table thead th {
  color: var(--glass-ink) !important;
  font-weight: 800;
}

.attendance-page .table tbody td,
.analysis-page .table tbody td {
  color: var(--glass-ink) !important;
  font-weight: 600;
  border-color: rgba(15,23,42,0.12) !important;
}

.attendance-page label,
.analysis-page label,
.attendance-page h1,
.attendance-page h2,
.attendance-page h3,
.attendance-page h4,
.attendance-page h5,
.analysis-page h1,
.analysis-page h2,
.analysis-page h3,
.analysis-page h4,
.analysis-page h5 {
  color: #0f2747 !important;
  font-weight: 750;
}

.attendance-page .form-control,
.attendance-page .form-select,
.analysis-page .form-control,
.analysis-page .form-select {
  color: var(--glass-ink) !important;
  background: rgba(255,255,255,0.28) !important;
  border: 1px solid rgba(15,39,71,0.20) !important;
}

.attendance-page .form-control::placeholder,
.analysis-page .form-control::placeholder {
  color: var(--glass-muted) !important;
  opacity: 1;
}

.attendance-page .badge,
.analysis-page .badge {
  font-weight: 800;
  border: 1px solid rgba(15,23,42,0.14);
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, rgba(96,165,250,0.45), rgba(79,70,229,0.45));
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
  .card {
    border-radius: 20px !important;
  }

  .main-content {
    padding: 16px;
  }

  .app-sidebar {
    border-radius: 0 24px 24px 0 !important;
  }
}