/* =========================================================
   Senior UI Design System — School MIS
   Goal: faster workflows, clearer hierarchy, premium admin UI
   Safe layer: overrides only; no business logic changes.
   ========================================================= */

:root {
  --ui-navy-950: #071426;
  --ui-navy-900: #0b1f3a;
  --ui-navy-850: #0f2a4f;
  --ui-navy-800: #123763;
  --ui-blue-700: #1d4ed8;
  --ui-blue-600: #2563eb;
  --ui-blue-500: #3b82f6;
  --ui-cyan-500: #06b6d4;
  --ui-indigo-500: #6366f1;
  --ui-slate-950: #020617;
  --ui-slate-900: #0f172a;
  --ui-slate-800: #1e293b;
  --ui-slate-700: #334155;
  --ui-slate-600: #475569;
  --ui-slate-500: #64748b;
  --ui-slate-400: #94a3b8;
  --ui-slate-300: #cbd5e1;
  --ui-slate-200: #e2e8f0;
  --ui-slate-100: #f1f5f9;
  --ui-slate-50: #f8fafc;
  --ui-white: #ffffff;
  --ui-success: #16a34a;
  --ui-success-soft: #ecfdf5;
  --ui-warning: #d97706;
  --ui-warning-soft: #fffbeb;
  --ui-danger: #dc2626;
  --ui-danger-soft: #fef2f2;
  --ui-info: #0284c7;
  --ui-info-soft: #eff6ff;
  --ui-radius-xs: 8px;
  --ui-radius-sm: 10px;
  --ui-radius-md: 14px;
  --ui-radius-lg: 18px;
  --ui-radius-xl: 24px;
  --ui-shadow-xs: 0 1px 2px rgba(15, 23, 42, .05);
  --ui-shadow-sm: 0 8px 20px rgba(15, 23, 42, .06);
  --ui-shadow-md: 0 16px 34px rgba(15, 23, 42, .09);
  --ui-shadow-lg: 0 24px 60px rgba(15, 23, 42, .14);
  --ui-ring: 0 0 0 4px rgba(37, 99, 235, .14);
  --ui-transition: 160ms ease;
  --ui-font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--ui-font) !important;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, .07), transparent 34rem),
    linear-gradient(180deg, #f8fbff 0%, #f4f7fb 42%, #f8fafc 100%) !important;
  color: var(--ui-slate-800);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(37, 99, 235, .18); color: var(--ui-slate-950); }
:focus-visible { outline: 3px solid rgba(37, 99, 235, .55) !important; outline-offset: 2px; border-radius: 8px; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 2000;
  transform: translateY(-160%);
  background: var(--ui-navy-900);
  color: #fff !important;
  padding: 10px 14px;
  border-radius: 999px;
  box-shadow: var(--ui-shadow-md);
  text-decoration: none;
  transition: transform var(--ui-transition);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- Layout shell ---------- */
.pc-container { background: transparent !important; }
.pc-content {
  padding: 22px !important;
  max-width: 1680px;
  margin: 0 auto;
}
.page-header {
  margin: 0 0 18px !important;
  padding: 0 !important;
  background: transparent !important;
  border: 0 !important;
}
.page-header-title h5,
.page-header h5 {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 !important;
  color: var(--ui-slate-950) !important;
  font-size: clamp(1.35rem, 1.8vw, 2rem) !important;
  line-height: 1.2;
  font-weight: 850 !important;
  letter-spacing: -.035em;
}
.page-header-title h5:before {
  content: "";
  width: 10px;
  height: 28px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--ui-cyan-500), var(--ui-blue-600));
  box-shadow: 0 8px 18px rgba(37, 99, 235, .24);
}
.breadcrumb,
.page-header .breadcrumb { color: var(--ui-slate-500); font-size: .86rem; }

/* ---------- Sidebar ---------- */
.pc-sidebar {
  background: linear-gradient(180deg, var(--ui-navy-950) 0%, var(--ui-navy-900) 55%, #08192f 100%) !important;
  border-right: 1px solid rgba(148, 163, 184, .12) !important;
  box-shadow: 16px 0 48px rgba(2, 6, 23, .12);
}
.pc-sidebar .m-header {
  min-height: 74px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(255,255,255,.02);
}
.pc-sidebar .b-brand,
.pc-sidebar .b-brand span {
  color: #fff !important;
  letter-spacing: -.02em;
}
.pc-sidebar .pc-caption label {
  color: rgba(226, 232, 240, .58) !important;
  font-size: .68rem !important;
  font-weight: 800 !important;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.pc-sidebar .pc-link {
  min-height: 42px;
  margin: 3px 12px;
  padding: 10px 12px !important;
  border-radius: 12px;
  color: rgba(241, 245, 249, .78) !important;
  transition: background var(--ui-transition), color var(--ui-transition), transform var(--ui-transition);
}
.pc-sidebar .pc-link:hover,
.pc-sidebar .pc-link:focus,
.pc-sidebar .pc-item.active > .pc-link,
.pc-sidebar .pc-item.pc-trigger > .pc-link,
.pc-sidebar .pc-item.ui-active > .pc-link {
  background: linear-gradient(135deg, rgba(37, 99, 235, .26), rgba(6, 182, 212, .16)) !important;
  color: #fff !important;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.08);
}
.pc-sidebar .pc-link:hover { transform: translateX(2px); }
.pc-sidebar .pc-micon {
  color: rgba(125, 211, 252, .9) !important;
  font-size: 1.15rem;
}
.pc-sidebar .pc-submenu .pc-link {
  min-height: 36px;
  margin-left: 20px;
  padding-top: 8px !important;
  padding-bottom: 8px !important;
  font-size: .88rem;
}
.pc-sidebar .pc-user-card {
  margin: 12px;
  border: 1px solid rgba(255,255,255,.10);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(255,255,255,.10), rgba(255,255,255,.035));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08);
  overflow: hidden;
}

/* ---------- Header ---------- */
.pc-header {
  background: rgba(255,255,255,.86) !important;
  backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid rgba(203, 213, 225, .72) !important;
  box-shadow: 0 10px 26px rgba(15, 23, 42, .045);
}
.pc-header .header-wrapper { min-height: 70px; }
.pc-head-link {
  border-radius: 14px !important;
  transition: background var(--ui-transition), transform var(--ui-transition), box-shadow var(--ui-transition);
}
.pc-head-link:hover,
.pc-head-link:focus {
  background: var(--ui-info-soft) !important;
  transform: translateY(-1px);
  box-shadow: var(--ui-shadow-xs);
}
.pc-header .input-group {
  background: #fff;
  border: 1px solid var(--ui-slate-200);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: var(--ui-shadow-xs);
}
.pc-header .input-group-text,
.pc-header .form-control {
  border: 0 !important;
  background: transparent !important;
}
.pc-header input[type="search"] { min-height: 40px; }
.dropdown-menu {
  border: 1px solid var(--ui-slate-200) !important;
  border-radius: 16px !important;
  box-shadow: var(--ui-shadow-lg) !important;
  padding: 8px !important;
}
.dropdown-item {
  border-radius: 10px;
  padding: 10px 12px !important;
  color: var(--ui-slate-700) !important;
  display: flex;
  gap: 10px;
  align-items: center;
}
.dropdown-item:hover,
.dropdown-item:focus { background: var(--ui-slate-100) !important; color: var(--ui-slate-950) !important; }

/* ---------- Cards / panels ---------- */
.card,
.x_panel,
.dashboard-card,
.ux-card,
.ux-kpi,
.ux-checklist,
.control-tower-tabs > li > a,
.modal-content {
  border: 1px solid rgba(203, 213, 225, .78) !important;
  border-radius: var(--ui-radius-lg) !important;
  background: rgba(255,255,255,.96) !important;
  box-shadow: var(--ui-shadow-sm) !important;
}
.card,
.x_panel { overflow: hidden; }
.card:hover,
.x_panel:hover,
.dashboard-card:hover,
.ux-card:hover {
  box-shadow: var(--ui-shadow-md) !important;
  border-color: rgba(147, 197, 253, .7) !important;
}
.card-header,
.x_title,
.modal-header {
  background: linear-gradient(180deg, #fff 0%, #f8fafc 100%) !important;
  border-bottom: 1px solid var(--ui-slate-200) !important;
  padding: 16px 18px !important;
}
.card-body,
.x_content { padding: 18px !important; }
.x_title h2,
.card-title,
.card h5,
.card h4 {
  color: var(--ui-slate-950) !important;
  font-weight: 800 !important;
  letter-spacing: -.02em;
}
.x_title h2 { font-size: 1.05rem !important; }

/* KPI cards that already exist in the project */
.kpi-card,
.stat-card,
.ux-kpi {
  position: relative;
  overflow: hidden;
}
.kpi-card:after,
.stat-card:after,
.ux-kpi:after {
  content: "";
  position: absolute;
  width: 90px;
  height: 90px;
  border-radius: 999px;
  right: -32px;
  top: -34px;
  background: rgba(255,255,255,.16);
  pointer-events: none;
}
.stat-card { transform: none !important; }
.stat-card:hover { transform: translateY(-2px) !important; }

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  color: var(--ui-slate-950);
  font-family: var(--ui-font) !important;
  letter-spacing: -.025em;
}
p, li, td, th, label, input, select, textarea, button { font-family: var(--ui-font) !important; }
.text-muted { color: var(--ui-slate-500) !important; }
.small, small { color: var(--ui-slate-500); }

/* ---------- Buttons ---------- */
.btn {
  border-radius: 12px !important;
  font-weight: 750 !important;
  letter-spacing: -.01em;
  min-height: 38px;
  padding: 9px 14px !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-width: 1px !important;
  transition: transform var(--ui-transition), box-shadow var(--ui-transition), background var(--ui-transition), border-color var(--ui-transition);
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--ui-shadow-sm); }
.btn:active { transform: translateY(0); box-shadow: none; }
.btn:disabled, .btn.disabled { opacity: .62; transform: none !important; box-shadow: none !important; cursor: not-allowed; }
.btn-primary,
.btn-success,
.btn-info {
  border-color: transparent !important;
  color: #fff !important;
}
.btn-primary { background: linear-gradient(135deg, var(--ui-blue-700), var(--ui-cyan-500)) !important; }
.btn-success { background: linear-gradient(135deg, #15803d, #22c55e) !important; }
.btn-warning { background: linear-gradient(135deg, #d97706, #f59e0b) !important; color: #fff !important; border-color: transparent !important; }
.btn-danger { background: linear-gradient(135deg, #b91c1c, #ef4444) !important; color: #fff !important; border-color: transparent !important; }
.btn-secondary { background: #fff !important; color: var(--ui-slate-700) !important; border-color: var(--ui-slate-300) !important; }
.btn-outline-primary { color: var(--ui-blue-700) !important; border-color: rgba(37,99,235,.32) !important; background: rgba(239,246,255,.6) !important; }
.btn-link { color: var(--ui-blue-700) !important; text-decoration: none !important; }
.btn-sm { min-height: 34px; padding: 6px 11px !important; border-radius: 10px !important; }
.btn-lg { min-height: 46px; padding: 12px 18px !important; border-radius: 14px !important; }

/* ---------- Forms ---------- */
.form-control,
.form-select,
select,
textarea,
input[type="text"],
input[type="email"],
input[type="number"],
input[type="password"],
input[type="date"],
input[type="time"],
input[type="search"],
input[type="tel"],
input[type="url"] {
  border: 1px solid var(--ui-slate-300) !important;
  border-radius: 12px !important;
  min-height: 42px;
  color: var(--ui-slate-900) !important;
  background-color: #fff !important;
  box-shadow: var(--ui-shadow-xs);
  transition: border-color var(--ui-transition), box-shadow var(--ui-transition), background var(--ui-transition);
}
.form-control:hover,
.form-select:hover,
select:hover,
textarea:hover,
input:hover { border-color: #93c5fd !important; }
.form-control:focus,
.form-select:focus,
select:focus,
textarea:focus,
input:focus {
  border-color: var(--ui-blue-600) !important;
  box-shadow: var(--ui-ring) !important;
  outline: 0 !important;
}
textarea.form-control,
textarea { min-height: 110px; }
label,
.form-label,
.col-form-label {
  color: var(--ui-slate-700) !important;
  font-weight: 700 !important;
  margin-bottom: 6px;
}
.form-text { color: var(--ui-slate-500) !important; }
.invalid-feedback,
.errorlist,
.error { color: var(--ui-danger) !important; font-weight: 650; }
.form-control.is-invalid,
.was-validated .form-control:invalid { border-color: var(--ui-danger) !important; box-shadow: 0 0 0 4px rgba(220, 38, 38, .10) !important; }
.form-control.is-valid,
.was-validated .form-control:valid { border-color: var(--ui-success) !important; box-shadow: 0 0 0 4px rgba(22, 163, 74, .10) !important; }
.help-block { color: var(--ui-slate-500); }
.input-group-text { border-color: var(--ui-slate-300) !important; border-radius: 12px !important; }

/* ---------- Tables / DataTables ---------- */
.table-responsive {
  border: 1px solid var(--ui-slate-200);
  border-radius: var(--ui-radius-lg);
  background: #fff;
  box-shadow: var(--ui-shadow-sm);
  overflow: auto;
}
table.table,
.table,
table.dataTable {
  width: 100% !important;
  margin-bottom: 0 !important;
  border-collapse: separate !important;
  border-spacing: 0 !important;
  color: var(--ui-slate-800);
}
.table thead th,
table.dataTable thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: #f8fafc !important;
  color: var(--ui-slate-700) !important;
  font-size: .76rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  font-weight: 850 !important;
  border-bottom: 1px solid var(--ui-slate-200) !important;
  padding: 13px 14px !important;
  white-space: nowrap;
}
.table tbody td,
table.dataTable tbody td {
  padding: 13px 14px !important;
  vertical-align: middle !important;
  border-bottom: 1px solid #eef2f7 !important;
}
.table-striped tbody tr:nth-of-type(odd),
table.dataTable.display tbody tr.odd,
table.dataTable.stripe tbody tr.odd { background: rgba(248,250,252,.76) !important; }
.table-hover tbody tr:hover,
table.dataTable.hover tbody tr:hover,
table.dataTable.display tbody tr:hover {
  background: #eff6ff !important;
}
.table .btn,
table.dataTable .btn { min-height: 32px; padding: 5px 9px !important; }
.table .dropdown-toggle:after { margin-left: 6px; }
.dataTables_wrapper,
.dt-container { margin-top: 0; }
.dataTables_wrapper .dataTables_filter,
.dt-search { margin-bottom: 12px; }
.dataTables_wrapper .dataTables_filter input,
.dt-search input { margin-left: 8px; min-height: 38px; }
.dataTables_wrapper .dataTables_length select,
.dt-length select { min-height: 36px; margin: 0 6px; }
.dataTables_wrapper .dataTables_paginate .paginate_button,
.dt-paging .dt-paging-button {
  border-radius: 10px !important;
  border: 1px solid var(--ui-slate-200) !important;
  margin: 0 2px !important;
}
.dt-buttons .btn { margin-right: 6px; }

/* ---------- Alerts, badges, toasts ---------- */
.alert {
  border-radius: var(--ui-radius-md) !important;
  border-width: 1px !important;
  box-shadow: var(--ui-shadow-xs);
}
.alert-success { background: var(--ui-success-soft) !important; color: #14532d !important; border-color: #bbf7d0 !important; }
.alert-warning { background: var(--ui-warning-soft) !important; color: #78350f !important; border-color: #fde68a !important; }
.alert-danger { background: var(--ui-danger-soft) !important; color: #7f1d1d !important; border-color: #fecaca !important; }
.alert-info { background: var(--ui-info-soft) !important; color: #0c4a6e !important; border-color: #bfdbfe !important; }
.badge,
.label {
  border-radius: 999px !important;
  padding: .42em .66em !important;
  font-weight: 800 !important;
  letter-spacing: .01em;
}
.bg-primary,
.label-primary { background: var(--ui-blue-600) !important; }
.bg-success,
.label-success { background: var(--ui-success) !important; }
.bg-warning,
.label-warning { background: var(--ui-warning) !important; color: #fff !important; }
.bg-danger,
.label-danger { background: var(--ui-danger) !important; }
.bg-info,
.label-info { background: var(--ui-info) !important; }
.toast,
.toast-container .toast {
  border-radius: var(--ui-radius-md) !important;
  box-shadow: var(--ui-shadow-lg) !important;
}

/* ---------- Empty/loading/action states ---------- */
.ui-empty-state,
.ux-empty {
  display: grid;
  place-items: center;
  text-align: center;
  min-height: 180px;
  border: 1px dashed var(--ui-slate-300) !important;
  border-radius: var(--ui-radius-lg) !important;
  background: linear-gradient(180deg, #fff, #f8fafc) !important;
  color: var(--ui-slate-500);
  padding: 28px;
}
.ui-empty-state i,
.ux-empty i { font-size: 2rem; color: var(--ui-blue-600); margin-bottom: 8px; }
.ui-skeleton {
  position: relative;
  overflow: hidden;
  background: #e2e8f0;
  border-radius: 10px;
}
.ui-skeleton:after {
  content: "";
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.65), transparent);
  animation: ui-shimmer 1.35s infinite;
}
@keyframes ui-shimmer { 100% { transform: translateX(100%); } }

/* ---------- Dashboard widgets ---------- */
.ux-hero {
  background:
    radial-gradient(circle at top right, rgba(6, 182, 212, .34), transparent 18rem),
    linear-gradient(135deg, var(--ui-navy-950), var(--ui-navy-800) 58%, #123a6d) !important;
  border: 1px solid rgba(125, 211, 252, .22);
  border-radius: var(--ui-radius-xl) !important;
  box-shadow: var(--ui-shadow-lg) !important;
}
.ux-grid,
.ux-kpi-row,
.row { --bs-gutter-x: 1rem; --bs-gutter-y: 1rem; }
.ux-card h3,
.ux-kpi strong { color: var(--ui-slate-950) !important; }
.ux-card-icon,
.stat-icon,
.kpi-icon {
  box-shadow: inset 0 1px 0 rgba(255,255,255,.35), var(--ui-shadow-xs);
}

/* ---------- Modals ---------- */
.modal-backdrop { backdrop-filter: blur(3px); }
.modal-content { overflow: hidden; }
.modal-footer { border-top: 1px solid var(--ui-slate-200) !important; background: #f8fafc; }
.btn-close { border-radius: 999px; }

/* ---------- Mobile/tablet usability ---------- */
@media (max-width: 1199px) {
  .pc-content { padding: 18px !important; }
}
@media (max-width: 767px) {
  body { background: #f8fafc !important; }
  .pc-content { padding: 14px !important; }
  .page-header-title h5,
  .page-header h5 { font-size: 1.28rem !important; }
  .card-body,
  .x_content { padding: 14px !important; }
  .btn { min-height: 42px; width: auto; }
  .btn-group,
  .btn-toolbar { flex-wrap: wrap; gap: 8px; }
  .table-responsive { border-radius: 14px; box-shadow: none; }
  .table thead th,
  table.dataTable thead th { position: static; }
  .table tbody td,
  table.dataTable tbody td { padding: 11px 12px !important; }
  .pc-header .header-wrapper { min-height: 62px; }
  .pc-header .pc-head-link { min-width: 42px; min-height: 42px; }
  .dropdown-menu { max-width: calc(100vw - 24px); }
}

/* ---------- Print safety ---------- */
@media print {
  body { background: #fff !important; color: #000 !important; }
  .pc-sidebar,
  .pc-header,
  .page-header,
  .btn,
  .dropdown-menu,
  .skip-link { display: none !important; }
  .pc-container,
  .pc-content { margin: 0 !important; padding: 0 !important; max-width: none !important; }
  .card,
  .x_panel,
  .table-responsive { box-shadow: none !important; border-color: #d1d5db !important; }
  .table thead th { position: static !important; }
}

/* ---------- Reduced motion/accessibility ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}