/* ============================================================================
   SCHOOL ERP — DESIGN SYSTEM
   Mobile-first, accessible, printable. Built on top of Bootstrap 5 utilities.
   ============================================================================ */

:root {
  --erp-primary: #1a4d8f;      /* deep academic blue */
  --erp-primary-dark: #123a6b;
  --erp-accent: #e8912d;       /* warm accent (marigold) */
  --erp-success: #1c8a5a;
  --erp-danger: #c0392b;
  --erp-warning: #c9860a;
  --erp-bg: #f4f6f9;
  --erp-surface: #ffffff;
  --erp-border: #e1e5eb;
  --erp-text: #202733;
  --erp-text-muted: #667085;
  --erp-radius: 10px;
  --erp-font: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  font-family: var(--erp-font);
  background: var(--erp-bg);
  color: var(--erp-text);
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; }

/* ---------- Sticky top navigation ---------- */
.erp-navbar {
  background: linear-gradient(90deg, var(--erp-primary-dark), var(--erp-primary));
  padding: .3rem 1.25rem;
  position: sticky !important;
  top: 0 !important;
  z-index: 1030;
  box-shadow: 0 1px 4px rgba(0,0,0,.1);
  transition: box-shadow .25s ease;
}
.erp-navbar.scrolled {
  box-shadow: 0 4px 16px rgba(0,0,0,.25);
}
.erp-navbar .navbar-brand {
  display: flex; flex-direction: column; align-items: flex-start; justify-content: center;
  gap: 0; color: #fff; font-weight: 700; padding: .1rem 0; margin-right: 1rem;
}
.erp-navbar .navbar-brand img {
  height: auto; width: auto; max-height: 12px; max-width: 130px;
  border-radius: 3px; background: #fff; object-fit: contain; flex-shrink: 0; margin-bottom: 1px;
}
.erp-navbar .navbar-brand span {
  font-size: .68rem; line-height: 1.15; font-weight: 600;
  white-space: nowrap; max-width: 150px; overflow: hidden; text-overflow: ellipsis;
}
.erp-navbar .nav-link {
  color: rgba(255,255,255,.85) !important;
  font-size: .85rem;
  font-weight: 500;
  padding: .4rem .65rem !important;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.erp-navbar .nav-link:hover { color: #fff !important; }
.erp-navbar .nav-link.active { color: #fff !important; border-bottom-color: var(--erp-accent); font-weight: 600; }
.erp-navbar .nav-link.dropdown-toggle::after { margin-left: .35em; vertical-align: .1em; }
.erp-navbar .dropdown-menu {
  border: none; border-radius: 10px; box-shadow: 0 10px 28px rgba(0,0,0,.18); padding: .4rem;
  font-size: .87rem; margin-top: .4rem;
}
.erp-navbar .dropdown-item { border-radius: 6px; padding: .5rem .7rem; display: flex; align-items: center; gap: .55rem; color: var(--erp-text); }
.erp-navbar .dropdown-item:hover, .erp-navbar .dropdown-item:focus { background: var(--erp-bg); color: var(--erp-text); }
.erp-navbar .dropdown-item.active, .erp-navbar .dropdown-item:active { background: var(--erp-primary); color: #fff; }
.erp-navbar .dropdown-item i { width: 1.1em; text-align: center; color: var(--erp-primary); }
.erp-navbar .dropdown-item.text-danger i { color: var(--erp-danger); }
.erp-navbar .dropdown-item:active i, .erp-navbar .dropdown-item.active i { color: #fff; }
.erp-navbar .navbar-toggler { border-color: rgba(255,255,255,.35); padding: .3rem .5rem; }
.erp-navbar .navbar-toggler-icon { filter: invert(1) grayscale(100%) brightness(200%); }
.erp-navbar .form-select-sm { min-width: 170px; }

.erp-content { padding: 1.5rem; max-width: 1400px; margin: 0 auto; }

/* ---------- Navigation bar position (top / bottom / left / right) ----------
   Applies at desktop widths only (see the max-width:991.98px override below,
   which forces standard top-bar behavior on phones/small tablets regardless
   of preference — a permanent 220px side rail doesn't work on a small screen). */
@media (min-width: 992px) {
  body[data-nav-position="bottom"] .erp-navbar {
    position: fixed !important; top: auto !important; bottom: 0; left: 0; right: 0; width: 100%;
  }
  body[data-nav-position="bottom"] { padding-bottom: 64px; }
  body[data-nav-position="bottom"] .erp-navbar.scrolled { box-shadow: 0 -4px 16px rgba(0,0,0,.25); }

  body[data-nav-position="left"] .erp-navbar,
  body[data-nav-position="right"] .erp-navbar {
    position: fixed !important; top: 0 !important; bottom: 0; width: 210px; height: 100vh;
    padding: .75rem .5rem; overflow-y: auto; box-shadow: 2px 0 10px rgba(0,0,0,.1);
  }
  body[data-nav-position="left"] .erp-navbar { left: 0; right: auto; }
  body[data-nav-position="right"] .erp-navbar { right: 0; left: auto; box-shadow: -2px 0 10px rgba(0,0,0,.1); }
  body[data-nav-position="left"] { padding-left: 210px; }
  body[data-nav-position="right"] { padding-right: 210px; }

  body[data-nav-position="left"] .erp-navbar .container-fluid,
  body[data-nav-position="right"] .erp-navbar .container-fluid {
    flex-direction: column; align-items: stretch; height: 100%; flex-wrap: nowrap;
  }
  body[data-nav-position="left"] .erp-navbar .navbar-brand,
  body[data-nav-position="right"] .erp-navbar .navbar-brand {
    margin-right: 0; padding: .5rem 0 .75rem; border-bottom: 1px solid rgba(255,255,255,.15);
    align-items: center;
  }
  body[data-nav-position="left"] .erp-navbar .navbar-toggler,
  body[data-nav-position="right"] .erp-navbar .navbar-toggler { display: none; }
  body[data-nav-position="left"] .erp-navbar .navbar-collapse,
  body[data-nav-position="right"] .erp-navbar .navbar-collapse {
    display: block !important; flex-grow: 1; overflow-y: auto;
  }
  body[data-nav-position="left"] .erp-navbar .navbar-nav,
  body[data-nav-position="right"] .erp-navbar .navbar-nav {
    flex-direction: column !important; width: 100%;
  }
  body[data-nav-position="left"] .erp-navbar .navbar-nav.ms-auto,
  body[data-nav-position="right"] .erp-navbar .navbar-nav.ms-auto {
    margin-top: .5rem; padding-top: .5rem; border-top: 1px solid rgba(255,255,255,.15);
  }
  body[data-nav-position="left"] .erp-navbar .nav-link,
  body[data-nav-position="right"] .erp-navbar .nav-link {
    border-bottom: none; border-left: 3px solid transparent; border-radius: 0 6px 6px 0;
  }
  body[data-nav-position="left"] .erp-navbar .nav-link.active,
  body[data-nav-position="right"] .erp-navbar .nav-link.active {
    border-bottom: none; border-left-color: var(--erp-accent); background: rgba(255,255,255,.08);
  }
  body[data-nav-position="left"] .erp-navbar .dropdown-menu,
  body[data-nav-position="right"] .erp-navbar .dropdown-menu {
    position: static !important; transform: none !important; width: 100%;
    box-shadow: none; background: rgba(0,0,0,.15); margin: 0 0 .25rem;
  }
  body[data-nav-position="left"] .erp-navbar .dropdown-item,
  body[data-nav-position="right"] .erp-navbar .dropdown-item {
    color: rgba(255,255,255,.85);
  }
  body[data-nav-position="left"] .erp-navbar .dropdown-item:hover,
  body[data-nav-position="right"] .erp-navbar .dropdown-item:hover {
    background: rgba(255,255,255,.1); color: #fff;
  }
  body[data-nav-position="left"] .erp-navbar .dropdown-item i,
  body[data-nav-position="right"] .erp-navbar .dropdown-item i {
    color: rgba(255,255,255,.7);
  }
  body[data-nav-position="left"] .erp-navbar .form-select-sm,
  body[data-nav-position="right"] .erp-navbar .form-select-sm {
    min-width: 0; width: 100%;
  }
}
@media (max-width: 991.98px) {
  /* Small screens always behave as a standard collapsible top bar, no matter the saved preference. */
  body[data-nav-position="bottom"] .erp-navbar,
  body[data-nav-position="left"] .erp-navbar,
  body[data-nav-position="right"] .erp-navbar {
    position: sticky !important; top: 0 !important; bottom: auto; left: auto; right: auto; width: auto; height: auto;
  }
  body[data-nav-position="bottom"],
  body[data-nav-position="left"],
  body[data-nav-position="right"] {
    padding: 0;
  }
}

/* ---------- Cards / panels ---------- */
.erp-card {
  background: var(--erp-surface);
  border: 1px solid var(--erp-border);
  border-radius: var(--erp-radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.erp-card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 1rem; flex-wrap: wrap; gap: .5rem;
}
.erp-card-header h2, .erp-card-header h3 { margin: 0; font-size: 1.1rem; font-weight: 700; }

.stat-card {
  background: var(--erp-surface);
  border-radius: var(--erp-radius);
  border: 1px solid var(--erp-border);
  padding: 1.1rem;
  display: flex; align-items: center; gap: .9rem;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.stat-card-link { display: block; text-decoration: none; color: inherit; }
.stat-card-link:hover .stat-card,
.stat-card-link:hover .erp-card {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,.08);
  border-color: var(--erp-primary);
}
table.erp-table tr.row-link { cursor: pointer; }
table.erp-table tr.row-link:hover { background: var(--erp-bg); }
.stat-card .icon {
  width: 46px; height: 46px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; color: #fff; flex-shrink: 0;
}
.stat-card .value { font-size: 1.4rem; font-weight: 800; line-height: 1.1; }
.stat-card .label { color: var(--erp-text-muted); font-size: .82rem; }

/* ---------- Buttons ---------- */
.btn-erp-primary {
  background: var(--erp-primary); border-color: var(--erp-primary); color: #fff;
}
.btn-erp-primary:hover { background: var(--erp-primary-dark); color: #fff; }
.btn-erp-accent { background: var(--erp-accent); border-color: var(--erp-accent); color: #fff; }

/* ---------- Tables ---------- */
.erp-table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table.erp-table { width: 100%; border-collapse: collapse; font-size: .89rem; }
table.erp-table th {
  background: #f8f9fb; text-align: left; padding: .65rem .75rem;
  border-bottom: 2px solid var(--erp-border); white-space: nowrap;
  font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; color: var(--erp-text-muted);
}
table.erp-table td { padding: .65rem .75rem; border-bottom: 1px solid var(--erp-border); vertical-align: middle; }
table.erp-table tbody tr:hover { background: #f9fafc; }

.badge-status { padding: .3em .6em; border-radius: 20px; font-size: .74rem; font-weight: 600; }
.badge-active, .badge-paid, .badge-present { background: #e3f5ec; color: var(--erp-success); }
.badge-inactive, .badge-absent { background: #fdeceb; color: var(--erp-danger); }
.badge-pending, .badge-partial, .badge-late { background: #fdf3e2; color: var(--erp-warning); }

/* ---------- Sortable table headers ---------- */
table.sortable-table thead th.sortable-th {
  cursor: pointer; user-select: none; position: relative; padding-right: 1.6rem !important;
}
table.sortable-table thead th.sortable-th:hover { background: #eef1f6; }
table.sortable-table thead th.sortable-th::after {
  content: "⇅"; /* plain UTF-8 glyph, no icon font or CSS-escape dependency */
  position: absolute; top: 50%; right: .6rem; transform: translateY(-50%);
  opacity: .4; font-size: .85em; font-family: initial; line-height: 1;
}
table.sortable-table thead th.sort-asc::after { content: "↑"; opacity: 1; color: var(--erp-primary); }
table.sortable-table thead th.sort-desc::after { content: "↓"; opacity: 1; color: var(--erp-primary); }

/* ---------- Forms ---------- */
.form-label { font-weight: 600; font-size: .86rem; margin-bottom: .3rem; }
.form-section-title {
  font-weight: 700; font-size: .95rem; color: var(--erp-primary);
  margin: 1.25rem 0 .75rem; padding-bottom: .4rem; border-bottom: 2px solid var(--erp-border);
}
.required::after { content: " *"; color: var(--erp-danger); }

/* ---------- Timetable grid ---------- */
.timetable-grid { display: grid; grid-template-columns: 90px repeat(6, 1fr); gap: 4px; }
.timetable-grid .cell {
  background: var(--erp-surface); border: 1px solid var(--erp-border); border-radius: 6px;
  padding: .5rem; font-size: .76rem; min-height: 56px;
}
.timetable-grid .cell.head { background: var(--erp-primary); color: #fff; font-weight: 700; text-align: center; }
.timetable-grid .cell.break-cell { background: #fdf3e2; }
.timetable-grid .subj { font-weight: 700; }
.timetable-grid .teacher { color: var(--erp-text-muted); }

/* ---------- Receipt / printable ---------- */
.receipt-box { max-width: 720px; margin: 0 auto; background: #fff; padding: 2rem; border: 1px solid var(--erp-border); }
@media print {
  .erp-navbar, .no-print { display: none !important; }
  body { background: #fff; }
}

/* ---------- Mobile responsiveness ---------- */
@media (max-width: 991.98px) {
  .erp-content { padding: 1rem .75rem; }
  .erp-navbar .navbar-collapse { margin-top: .75rem; padding-top: .5rem; border-top: 1px solid rgba(255,255,255,.15); }
  .erp-navbar .nav-link { border-bottom: none; border-left: 2px solid transparent; padding: .6rem .5rem !important; }
  .erp-navbar .nav-link.active { border-left-color: var(--erp-accent); border-bottom: none; }
  .erp-navbar .dropdown-menu { box-shadow: none; background: rgba(255,255,255,.06); margin-top: 0; }
  .erp-navbar .dropdown-item { color: rgba(255,255,255,.85); }
  .erp-navbar .dropdown-item:hover { background: rgba(255,255,255,.1); color: #fff; }
  .erp-navbar .dropdown-item i { color: rgba(255,255,255,.7); }
  .erp-navbar .form-select-sm { min-width: 0; width: 100%; }
  .timetable-grid { grid-template-columns: 70px repeat(6, minmax(90px, 1fr)); font-size: .7rem; overflow-x: auto; }
}

.login-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--erp-primary-dark), var(--erp-primary));
  padding: 1rem;
}
.login-card { background: #fff; border-radius: var(--erp-radius); padding: 2.5rem 2rem; width: 100%; max-width: 400px; }

/* ---------- Student search-box (typeahead) ---------- */
.student-search-results {
  max-height: 320px; overflow-y: auto; z-index: 1050;
  border-radius: 8px; box-shadow: 0 10px 28px rgba(0,0,0,.15);
}

/* ---------- AJAX navigation loading indicator ---------- */
#spaLoadingBar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--erp-accent); z-index: 2000;
  transition: width .3s ease, opacity .2s ease;
  opacity: 0;
}
#spaLoadingBar.active { width: 70%; opacity: 1; }
body[data-nav-position="bottom"] #spaLoadingBar { top: auto; bottom: 0; }