:root {
  --bg: #f4f6f9;
  --surface: #ffffff;
  --border: #dfe3e8;
  --text: #1f2933;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --warning: #d97706;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.06);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px; color: var(--text); background: var(--bg); line-height: 1.45;
}
a { color: var(--primary); }
h1, h2, h3 { margin: 0 0 .5em; font-weight: 600; }
h2 { font-size: 18px; }
h3 { font-size: 15px; }
p { margin: 0 0 .75em; }

/* ---------- layout ---------- */
.topbar {
  display: flex; align-items: center; gap: 16px; padding: 0 20px; height: 54px;
  background: #111827; color: #fff;
}
.topbar .brand { font-weight: 600; font-size: 16px; }
.topbar .spacer { flex: 1; }
.topbar .user { color: #cbd5e1; font-size: 13px; }
.tabs { display: flex; gap: 2px; margin-left: 24px; }
.tabs button {
  background: none; border: none; color: #cbd5e1; padding: 0 14px; height: 54px; cursor: pointer;
  font-size: 14px; border-bottom: 3px solid transparent;
}
.tabs button:hover { color: #fff; }
.tabs button.active { color: #fff; border-bottom-color: var(--primary); }
.page { max-width: 1400px; margin: 0 auto; padding: 20px; }
.panel { display: none; }
.panel.active { display: block; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 18px; }
.card-header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.card-header h2 { margin: 0; }
.card-header .spacer { flex: 1; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } }

/* ---------- forms ---------- */
label { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .02em; }
input[type=text], input[type=search], input[type=password], input[type=email], input[type=number], input[type=date], input[type=tel], input[type=url], select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font: inherit; background: #fff; color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.15); }
textarea { min-height: 90px; resize: vertical; }
.field { margin-bottom: 14px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; }
.row > .field { flex: 1 1 160px; margin-bottom: 14px; }
.row > .field.narrow { flex: 0 1 120px; }
.inline { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.check { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 500; color: var(--text); text-transform: none; letter-spacing: 0; cursor: pointer; }
.check input { width: auto; margin: 0; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.time-picker { display: flex; gap: 6px; }
.time-picker select { width: auto; min-width: 64px; }
.days { display: flex; gap: 6px; flex-wrap: wrap; }
.days label { text-transform: none; letter-spacing: 0; font-size: 13px; }
.days .day {
  display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 34px; border: 1px solid var(--border);
  border-radius: 6px; cursor: pointer; font-weight: 600; color: var(--muted); background: #fff; user-select: none;
}
.days .day input { display: none; }
.days .day.on { background: var(--primary); color: #fff; border-color: var(--primary); }
.radio-group { display: flex; gap: 14px; flex-wrap: wrap; }
.radio-group label { text-transform: none; letter-spacing: 0; font-size: 14px; font-weight: 500; color: var(--text); display: inline-flex; gap: 6px; align-items: center; cursor: pointer; }
.scope-box { background: #fff7ed; border: 1px solid #fed7aa; border-radius: 6px; padding: 10px 12px; margin-bottom: 14px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: 6px; border: 1px solid var(--border);
  background: #fff; color: var(--text); font: inherit; font-weight: 500; cursor: pointer; white-space: nowrap;
}
.btn:hover { background: #f3f4f6; }
.btn:disabled { opacity: .55; cursor: default; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { color: var(--danger); border-color: #fecaca; }
.btn.danger:hover { background: #fef2f2; }
.btn.success { background: var(--success); border-color: var(--success); color: #fff; }
.btn.sm { padding: 4px 10px; font-size: 12px; }
.btn.link { border: none; background: none; color: var(--primary); padding: 4px 6px; }
.btn.link:hover { text-decoration: underline; background: none; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.btn-row .spacer { flex: 1; }

/* ---------- tables (scoped to .table-wrap so FullCalendar's own tables are untouched) ---------- */
.table-wrap { overflow-x: auto; }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table-wrap th, .table-wrap td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.table-wrap th { font-size: 12px; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); font-weight: 600; background: #fafbfc; }
.table-wrap tbody tr:hover td { background: #fafbff; }
.table-wrap td.num, .table-wrap th.num { text-align: right; white-space: nowrap; }
.table-wrap td.actions { white-space: nowrap; text-align: right; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 11px; font-weight: 600; }
.badge.on { background: #dcfce7; color: #166534; }
.badge.off { background: #f3f4f6; color: #6b7280; }
.badge.warn { background: #fef3c7; color: #92400e; }
.badge.info { background: #dbeafe; color: #1e40af; }
.chips { display: flex; gap: 4px; flex-wrap: wrap; }
.chip { background: #eef2ff; color: #3730a3; border-radius: 4px; padding: 1px 7px; font-size: 12px; }
.empty { color: var(--muted); padding: 24px; text-align: center; }

/* ---------- multi-select ---------- */
.ms { position: relative; min-width: 180px; }
.ms-toggle { width: 100%; justify-content: space-between; text-align: left; }
.ms-toggle .caret { color: var(--muted); font-size: 11px; }
.ms-panel {
  position: absolute; top: calc(100% + 4px); left: 0; z-index: 50; min-width: 260px; max-height: 320px; overflow: auto;
  background: #fff; border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow); padding: 8px;
}
.ms-panel input[type=text] { margin-bottom: 6px; }
.ms-item { display: flex; align-items: center; gap: 8px; padding: 5px 6px; border-radius: 4px; cursor: pointer; font-size: 13px; font-weight: 500; color: var(--text); text-transform: none; letter-spacing: 0; margin: 0; }
.ms-item:hover { background: #f3f4f6; }
.ms-item input[type=checkbox] { width: 14px; height: 14px; flex: 0 0 auto; margin: 0; }
.ms-item .sub { color: var(--muted); font-size: 12px; margin-left: auto; }
.ms-item.all { font-weight: 600; border-bottom: 1px solid var(--border); margin-bottom: 4px; padding-bottom: 7px; }

/* ---------- search-select ---------- */
.ss { position: relative; }
.ss .ss-input { padding-right: 28px; }
.ss .ss-clear { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); border: none; background: none; color: var(--muted); font-size: 18px; line-height: 1; cursor: pointer; padding: 0 4px; }
.ss .ss-clear:hover { color: var(--danger); }
.ss-panel { position: absolute; top: calc(100% + 4px); left: 0; right: 0; z-index: 60; background: #fff; border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow); max-height: 320px; overflow: auto; padding: 4px; }
.ss-item { display: flex; align-items: center; gap: 8px; padding: 6px 10px; border-radius: 4px; cursor: pointer; font-size: 13px; }
.ss-item:hover, .ss-item.hl { background: #f3f4f6; }
.ss-item .sub { margin-left: auto; color: var(--muted); font-size: 12px; }
.ss-item.pinned { font-weight: 600; border-bottom: 1px solid var(--border); border-radius: 4px 4px 0 0; margin-bottom: 4px; }
.ss-empty { padding: 8px 10px; color: var(--muted); font-size: 13px; }
.sp-add .ss-panel { max-height: 240px; }

/* ---------- student picker (class form) ---------- */
.picker-list { border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.picker-row { display: flex; align-items: center; gap: 10px; padding: 7px 10px; border-bottom: 1px solid var(--border); }
.picker-row:last-child { border-bottom: none; }
.picker-row .name { flex: 1; }
.picker-row .name small { color: var(--muted); margin-left: 6px; }
.picker-row input[type=number] { width: 110px; }
.picker-row .rm { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 16px; padding: 0 4px; }
.picker-row .rm:hover { color: var(--danger); }
.picker-empty { padding: 10px; color: var(--muted); font-size: 13px; }

/* ---------- modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(17,24,39,.45); display: flex; align-items: flex-start; justify-content: center;
  padding: 40px 16px; z-index: 100; overflow: auto;
}
.modal { background: #fff; border-radius: 10px; width: 100%; max-width: 640px; box-shadow: var(--shadow); }
.modal.wide { max-width: 820px; }
.modal-header { display: flex; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.modal-header h3 { margin: 0; font-size: 16px; flex: 1; }
.modal-close { background: none; border: none; font-size: 22px; cursor: pointer; color: var(--muted); line-height: 1; }
.modal-body { padding: 20px; }
.modal-footer { display: flex; gap: 8px; padding: 14px 20px; border-top: 1px solid var(--border); background: #fafbfc; border-radius: 0 0 10px 10px; }
.modal-footer .spacer { flex: 1; }
.error-box { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; border-radius: 6px; padding: 10px 12px; margin-bottom: 12px; font-size: 13px; }
.conflict-list { max-height: 220px; overflow: auto; margin: 8px 0; font-size: 13px; }
.conflict-list li { margin-bottom: 4px; }
pre.msg-preview { white-space: pre-wrap; background: #f9fafb; border: 1px solid var(--border); border-radius: 6px; padding: 10px; font: inherit; font-size: 13px; }

/* ---------- toast ---------- */
.toast-host { position: fixed; bottom: 20px; right: 20px; display: flex; flex-direction: column; gap: 8px; z-index: 200; }
.toast { background: #111827; color: #fff; padding: 10px 14px; border-radius: 6px; box-shadow: var(--shadow); font-size: 13px; max-width: 360px; }
.toast.error { background: var(--danger); }
.toast.success { background: var(--success); }

/* ---------- calendar ---------- */
.cal-toolbar { display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 14px; }
.cal-toolbar .field { margin: 0; }
.cal-toolbar .spacer { flex: 1; }
#calendar, #portal-calendar { background: #fff; border-radius: var(--radius); }
.fc { --fc-border-color: var(--border); --fc-today-bg-color: #fffbeb; font-size: 13px; }
.fc .fc-toolbar-title { font-size: 17px; font-weight: 600; }
.fc .fc-button { background: #fff; border: 1px solid var(--border); color: var(--text); text-transform: capitalize; box-shadow: none !important; }
.fc .fc-button:hover { background: #f3f4f6; }
.fc .fc-col-header-cell { background: #fafbfc; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
.fc .fc-col-header-cell-cushion { padding: 8px 4px; }
.fc .fc-button-primary:not(:disabled).fc-button-active, .fc .fc-button-primary:not(:disabled):active { background: var(--primary); border-color: var(--primary); color: #fff; }
.fc-event { cursor: pointer; border: none; font-size: 12px; }
/* A class box never extends below its time slot: without this the text block of a short
   class overhangs invisibly and steals clicks meant for the blank space beneath it. */
.fc-timegrid-event, .fc-timegrid-event .fc-event-main { overflow: hidden; }
.fc-ev { padding: 2px 4px; overflow: hidden; line-height: 1.3; }
.fc-ev .t { font-weight: 600; }
.fc-ev .s { opacity: .9; }
.fc-ev .m { opacity: .8; font-size: 11px; }
.fc-event.ev-cancelled { opacity: .5; }
.fc-event.ev-cancelled .fc-ev { text-decoration: line-through; }
.fc-event.ev-completed { opacity: .6; filter: saturate(.6); }
.info-box { background: #eff6ff; color: #1e3a8a; border: 1px solid #bfdbfe; border-radius: 6px; padding: 10px 12px; margin-bottom: 12px; font-size: 13px; }
.fc-daygrid-event .fc-ev { white-space: nowrap; text-overflow: ellipsis; }
.legend { display: flex; gap: 10px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin-top: 8px; }
.legend span { display: inline-flex; align-items: center; gap: 4px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; }

/* ---------- login ---------- */
.login-wrap { min-height: 100%; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login-card { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 32px; width: 100%; max-width: 380px; box-shadow: var(--shadow); }
.login-card h1 { font-size: 20px; margin-bottom: 4px; }
.login-card .sub { color: var(--muted); margin-bottom: 20px; }

/* ---------- payment QR upload ---------- */
.qr-row { display: flex; gap: 14px; align-items: flex-start; flex-wrap: wrap; }
.qr-preview { width: 132px; height: 132px; border: 1px dashed var(--border); border-radius: 6px; display: flex; align-items: center; justify-content: center; background: #fafbfc; text-align: center; padding: 6px; flex: 0 0 auto; }
.qr-preview img { max-width: 100%; max-height: 100%; }

/* ---------- date picker (flatpickr) ---------- */
.flatpickr-wrapper { display: block; }
.flatpickr-calendar { font-family: inherit; box-shadow: var(--shadow); border: 1px solid var(--border); }
.flatpickr-day.selected, .flatpickr-day.selected:hover, .flatpickr-day.startRange, .flatpickr-day.endRange {
  background: var(--primary); border-color: var(--primary);
}
.flatpickr-day.today { border-color: var(--warning); }
.flatpickr-day.today:hover { background: #fffbeb; color: var(--text); }
.flatpickr-current-month .flatpickr-monthDropdown-months { font-weight: 600; }
.flatpickr-current-month input.cur-year { font-weight: 600; }
.numInputWrapper:hover, .flatpickr-current-month .flatpickr-monthDropdown-months:hover { background: #f3f4f6; }

/* ---------- list filter bar + pager ---------- */
.filter-bar { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; margin-bottom: 12px; }
.filter-bar .field { margin: 0; min-width: 140px; }
.filter-bar .field.grow { flex: 1 1 260px; }
.filter-bar select { width: auto; min-width: 140px; }
.pager { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding-top: 12px; font-size: 13px; color: var(--muted); }
.pager .spacer { flex: 1; }
.pager .pages { display: flex; gap: 4px; }
.pager .per-page { display: inline-flex; align-items: center; gap: 6px; margin-right: 8px; font-size: 12px; text-transform: none; letter-spacing: 0; color: var(--muted); }
.pager .per-page select { width: auto; padding: 4px 6px; font-size: 12px; }
.pager .pages .btn.current { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- row selection (students) ---------- */
.table-wrap th.sel, .table-wrap td.sel { width: 32px; text-align: center; padding-left: 8px; padding-right: 4px; }
.table-wrap td.sel input, .table-wrap th.sel input { width: auto; margin: 0; cursor: pointer; }
.selection-bar { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 6px; padding: 8px 12px; margin-bottom: 10px; font-size: 13px; color: #1e3a8a; }
.selection-bar .spacer { flex: 1; }
tr.selected td { background: #f5f9ff; }
.promote-list { max-height: 260px; overflow: auto; margin: 6px 0 10px; font-size: 13px; }
.promote-list li { margin-bottom: 3px; }

/* ---------- CSV import dialog ---------- */
.import-summary { display: flex; gap: 10px; flex-wrap: wrap; margin: 4px 0 12px; }
.import-summary .stat { border: 1px solid var(--border); border-radius: 6px; padding: 6px 12px; min-width: 90px; }
.import-summary .stat b { display: block; font-size: 18px; }
.import-summary .stat span { font-size: 11px; text-transform: uppercase; color: var(--muted); }
.import-table { max-height: 380px; overflow: auto; border: 1px solid var(--border); border-radius: 6px; }
.import-table table { font-size: 12px; }
.import-table td.diff small { display: block; color: var(--muted); }
.import-table tr.err td { background: #fff5f5; }
.badge.add { background: #dcfce7; color: #166534; }
.badge.update { background: #dbeafe; color: #1e40af; }
.badge.unchanged { background: #f3f4f6; color: #6b7280; }
.badge.error { background: #fee2e2; color: #991b1b; }

/* ---------- fixed column widths (Teachers / Students / Payment advice) ---------- */
/* Widths come from each table's <colgroup>, so columns stay put when rows are filtered
   or paged; long values wrap inside their column instead of widening it. Below the
   min-width the wrapper scrolls sideways rather than squashing the button columns. */
.table-wrap table.fixed-cols { table-layout: fixed; width: 100%; min-width: 1100px; }
.table-wrap table.fixed-cols td, .table-wrap table.fixed-cols th { overflow-wrap: anywhere; }
.table-wrap table.fixed-cols td.actions { overflow-wrap: normal; }
.table-wrap table.fixed-cols tr.col-filters .col-filter > input[type=search] { width: 100%; min-width: 0; }

/* ---------- per-column filter row ---------- */
.table-wrap tr.col-filters th { padding: 4px 6px 8px; background: #fff; text-transform: none; letter-spacing: 0; }
.table-wrap tr.col-filters > th > input, .table-wrap tr.col-filters .col-filter > input { padding: 4px 8px; font-size: 12px; border-radius: 4px; min-width: 60px; }
.col-filter { display: flex; align-items: center; gap: 4px; }
.col-filter > input { flex: 1 1 auto; }
.sort-arrows { display: flex; flex-direction: column; gap: 1px; flex: 0 0 auto; }
.sort-arrows button { border: none; background: none; padding: 0; width: 14px; height: 10px; line-height: 10px; font-size: 8px; color: #b6bcc6; cursor: pointer; }
.sort-arrows button:hover { color: var(--text); }
.sort-arrows button.active { color: var(--primary); }
.table-wrap tr.col-filters > th > select { width: 100%; padding: 4px 6px; font-size: 12px; border-radius: 4px; font-weight: 500; color: var(--text); }
.table-wrap tr.col-filters .ms { min-width: 120px; }
.table-wrap tr.col-filters .ms-toggle { padding: 4px 8px; font-size: 12px; font-weight: 500; }
/* Let an open dropdown extend past a short table instead of being clipped by the scroll box. */
.table-wrap:has(.ms-panel:not([hidden])) { overflow: visible; }

/* ---------- audit log ---------- */
#audit-table td { font-size: 12px; }
#audit-table td.audit-details { color: var(--muted); }
#audit-table tr.audit-warn td:nth-child(3) { color: var(--danger); font-weight: 600; }

/* ---------- misc ---------- */
.placeholder-list { display: flex; gap: 6px; flex-wrap: wrap; margin: 6px 0 12px; }
.placeholder-list button { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px; }
.summary-row { display: flex; gap: 24px; flex-wrap: wrap; margin: 10px 0; }
.summary-row .stat b { display: block; font-size: 18px; }
.summary-row .stat span { color: var(--muted); font-size: 12px; text-transform: uppercase; }
.portal-detail dt { font-size: 12px; color: var(--muted); text-transform: uppercase; margin-top: 8px; }
.portal-detail dd { margin: 0; }