:root {
  --primary: #1a56db;
  --primary-dark: #1546b8;
  --primary-light: #3b82f6;
  --primary-soft: #eff6ff;
--primary-nav: rgba(59,130,246,.25);
--primary-glow: rgba(26,86,219,.35);
  --sidebar-bg: #0f2a5e;
  --sidebar-text: #b6c8ec;
  --sidebar-active: #ffffff;
  --sidebar-hover: rgba(255, 255, 255, 0.08);
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --success: #16a34a;
  --success-soft: #f0fdf4;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --info: #0891b2;
  --info-soft: #ecfeff;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 42, 94, 0.08), 0 4px 12px rgba(15, 42, 94, 0.06);
  --shadow-lg: 0 8px 28px rgba(15, 42, 94, 0.14);
  --sidebar-w: 248px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { font-size: 15px; }

body {
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: block;
}

.desktop-only { display: flex; min-height: 100vh; }

a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }

/* ============ LAYOUT ============ */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  z-index: 50;
  transition: transform 0.28s ease;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 20px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-logo .logo-badge {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 19px;
  box-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
  flex-shrink: 0;
}

.sidebar-logo .logo-text { color: #fff; font-weight: 700; font-size: 19px; letter-spacing: -0.3px; }
.sidebar-logo .logo-sub { font-size: 11px; color: var(--sidebar-text); letter-spacing: 0.6px; text-transform: uppercase; }

.sidebar-nav { flex: 1; overflow-y: auto; padding: 14px 12px 20px; }
.sidebar-nav::-webkit-scrollbar { width: 5px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 4px; }

.nav-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: rgba(182, 200, 236, 0.55); padding: 18px 12px 8px; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border-radius: 9px;
  color: var(--sidebar-text);
  margin-bottom: 3px;
  font-size: 14.5px;
  transition: background 0.15s, color 0.15s;
  position: relative;
}

.nav-item svg { flex-shrink: 0; opacity: 0.85; }

.nav-item:hover { background: var(--sidebar-hover); color: #fff; }
.nav-item.active { background: var(--primary-nav); color: var(--sidebar-active); }
.nav-item.active::before {
  content: "";
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 4px;
  border-radius: 4px;
  background: var(--primary-light);
}

.nav-item .nav-flag {
  margin-left: auto;
  font-size: 10px;
  background: rgba(59, 130, 246, 0.9);
  color: #fff;
  padding: 2px 7px;
  border-radius: 20px;
}

.sidebar-footer { padding: 16px; border-top: 1px solid rgba(255,255,255,0.08); }
.version { font-size: 11.5px; color: rgba(182, 200, 236, 0.55); text-align: center; }

/* ============ MAIN ============ */
.main { flex: 1; margin-left: var(--sidebar-w); transition: margin 0.28s ease; min-width: 0; display: flex; flex-direction: column; min-height: 100vh; }

/* Topbar */
.topbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 40;
}

/* Installed desktop app: use the former title-bar space while keeping
   browser-owned minimize/maximize/close controls unobstructed. */
@media (display-mode: window-controls-overlay) {
  .sidebar-logo, .topbar {
    -webkit-app-region: drag;
    app-region: drag;
  }
  .topbar {
    padding-right: max(24px, calc(100vw - env(titlebar-area-width, 100vw) + 24px));
  }
  .topbar a, .topbar button, .topbar input {
    -webkit-app-region: no-drag;
    app-region: no-drag;
  }
}

.topbar-title h1 { font-size: 19px; font-weight: 700; letter-spacing: -0.3px; }
.topbar-title p { font-size: 12.5px; color: var(--text-muted); }

.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 14px; }

.search-box { position: relative; }
.search-box input {
  height: 38px;
  width: 240px;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 0 12px 0 36px;
  background: var(--bg);
  font-size: 13.5px;
  outline: none;
  transition: border 0.15s, box-shadow 0.15s;
}
.search-box input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12); background: #fff; }
.search-box svg { position: absolute; left: 11px; top: 50%; transform: translateY(-50%); color: var(--text-muted); }

.icon-btn {
  width: 38px; height: 38px;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 9px;
  color: var(--text-muted);
  display: grid; place-items: center;
  transition: all 0.15s;
  position: relative;
}
.icon-btn:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.icon-btn .dot { position: absolute; top: 7px; right: 8px; width: 7px; height: 7px; border-radius: 50%; background: var(--danger); }

.avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #fff;
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}

.hamburger { display: none; width: 38px; height: 38px; border: 1px solid var(--border); background: #fff; border-radius: 9px; place-items: center; color: var(--text-muted); }
.hamburger svg { width: 20px; height: 20px; }

/* Content */
.content { flex: 1; padding: 24px; width: 100%; margin: 0 auto; }

.section-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.section-head h2 { font-size: 17px; font-weight: 700; }
.section-head .sub { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.section-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ============ CARDS & STATS ============ */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  gap: 14px;
  align-items: center;
  box-shadow: var(--shadow);
  transition: transform 0.15s, box-shadow 0.15s;
  position: relative;
  overflow: hidden;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-card::after { content: ""; position: absolute; right: -22px; top: -22px; width: 74px; height: 74px; border-radius: 50%; background: currentColor; opacity: 0.05; }

.stat-card .stat-icon { width: 52px; height: 52px; border-radius: 13px; display: grid; place-items: center; flex-shrink: 0; }
.stat-card .stat-icon svg { width: 26px; height: 26px; }
.stat-card .stat-info h3 { font-size: 26px; font-weight: 800; line-height: 1.1; letter-spacing: -0.5px; }
.stat-card .stat-info p { font-size: 13px; color: var(--text-muted); margin-top: 3px; }
.stat-card .stat-trend { font-size: 12px; margin-top: 4px; font-weight: 600; }
.trend-up { color: var(--success); }
.trend-down { color: var(--danger); }

.c-1 { color: var(--primary); } .c-1 .stat-icon { background: var(--primary-soft); }
.c-2 { color: #16a34a; } .c-2 .stat-icon { background: var(--success-soft); }
.c-3 { color: #d97706; } .c-3 .stat-icon { background: var(--warning-soft); }
.c-4 { color: #0891b2; } .c-4 .stat-icon { background: var(--info-soft); }

.c-1 .m-stat-icon { background: var(--primary-soft); }
.c-2 .m-stat-icon { background: var(--success-soft); }
.c-3 .m-stat-icon { background: var(--warning-soft); }
.c-4 .m-stat-icon { background: var(--info-soft); }

/* ---- colourful gradient stat cards (all sections) ---- */
.stat-card.c-1 { background: linear-gradient(135deg, var(--primary-dark), var(--primary-light)); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(29,78,216,.28); }
.stat-card.c-2 { background: linear-gradient(135deg, #15803d, #22c55e); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(21,128,61,.28); }
.stat-card.c-3 { background: linear-gradient(135deg, #b45309, #f59e0b); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(180,83,9,.28); }
.stat-card.c-4 { background: linear-gradient(135deg, #0e7490, #06b6d4); color: #fff; border-color: transparent; box-shadow: 0 8px 20px rgba(14,116,144,.28); }
.stat-card.c-1:hover, .stat-card.c-2:hover, .stat-card.c-3:hover, .stat-card.c-4:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(15,23,42,.28); }
.stat-card.c-1 .stat-icon, .stat-card.c-2 .stat-icon, .stat-card.c-3 .stat-icon, .stat-card.c-4 .stat-icon { background: rgba(255,255,255,.22); }
.stat-card.c-1 .stat-icon svg, .stat-card.c-2 .stat-icon svg, .stat-card.c-3 .stat-icon svg, .stat-card.c-4 .stat-icon svg { color: #fff; }
.stat-card.c-1 .stat-info p, .stat-card.c-2 .stat-info p, .stat-card.c-3 .stat-info p, .stat-card.c-4 .stat-info p { color: rgba(255,255,255,.85); }
.stat-card.c-1 .stat-trend, .stat-card.c-2 .stat-trend, .stat-card.c-3 .stat-trend, .stat-card.c-4 .stat-trend { color: rgba(255,255,255,.72); }
.stat-card.c-1::after, .stat-card.c-2::after, .stat-card.c-3::after, .stat-card.c-4::after { background: #fff; opacity: .12; }

.m-stat-card.c-1 { background: linear-gradient(135deg, var(--primary-dark), var(--primary-light)); color: #fff; border-color: transparent; }
.m-stat-card.c-2 { background: linear-gradient(135deg, #15803d, #22c55e); color: #fff; border-color: transparent; }
.m-stat-card.c-3 { background: linear-gradient(135deg, #b45309, #f59e0b); color: #fff; border-color: transparent; }
.m-stat-card.c-4 { background: linear-gradient(135deg, #0e7490, #06b6d4); color: #fff; border-color: transparent; }
.m-stat-card.c-1 .m-stat-icon, .m-stat-card.c-2 .m-stat-icon, .m-stat-card.c-3 .m-stat-icon, .m-stat-card.c-4 .m-stat-icon { background: rgba(255,255,255,.22); }
.m-stat-card.c-1 .m-stat-icon svg, .m-stat-card.c-2 .m-stat-icon svg, .m-stat-card.c-3 .m-stat-icon svg, .m-stat-card.c-4 .m-stat-icon svg { color: #fff; }
.m-stat-card.c-1 .m-stat-label, .m-stat-card.c-2 .m-stat-label, .m-stat-card.c-3 .m-stat-label, .m-stat-card.c-4 .m-stat-label { color: rgba(255,255,255,.85); }
.m-stat-card.c-1 .m-stat-trend, .m-stat-card.c-2 .m-stat-trend, .m-stat-card.c-3 .m-stat-trend, .m-stat-card.c-4 .m-stat-trend { color: rgba(255,255,255,.72); }

/* Panels / cards */
.panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  overflow: hidden;
}

.panel-header { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.panel-header h3 { font-size: 15.5px; font-weight: 700; }
.panel-header .muted { font-size: 12.5px; color: var(--text-muted); font-weight: 400; }
.panel-body { padding: 20px; }

.grid-2 { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; align-items: start; }

/* ============ TABLES ============ */
.table-wrap { overflow-x: auto; }

table.table { width: 100%; border-collapse: collapse; font-size: 13.8px; }
.table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
  color: var(--text-muted);
  background: #f8fafc;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.table td { padding: 12px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.table tr:last-child td { border-bottom: none; }
.table tbody tr { transition: background 0.12s; }
.table tbody tr:hover { background: #f8fafc; }

.student-cell { display: flex; align-items: center; gap: 12px; }
.s-avatar { border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; flex-shrink: 0; }
.student-cell .s-avatar { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 14px; flex-shrink: 0; }
.student-cell .s-name { font-weight: 600; }
.student-cell .s-sub { font-size: 12px; color: var(--text-muted); }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.badge-green { background: var(--success-soft); color: var(--success); }
.badge-red { background: var(--danger-soft); color: var(--danger); }
.badge-amber { background: var(--warning-soft); color: var(--warning); }
.badge-blue { background: var(--primary-soft); color: var(--primary); }
.badge-gray { background: #f1f5f9; color: var(--text-muted); }

.table-actions { display: flex; gap: 6px; }
.icon-sm { width: 32px; height: 32px; border: 1px solid var(--border); background: #fff; border-radius: 8px; display: grid; place-items: center; color: var(--text-muted); transition: all 0.13s; }
.icon-sm:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.icon-sm.danger:hover { border-color: var(--danger); color: var(--danger); background: var(--danger-soft); }
.icon-sm svg { width: 16px; height: 16px; }

.empty-state { text-align: center; padding: 42px 20px; color: var(--text-muted); }
.empty-state svg { width: 52px; height: 52px; opacity: 0.35; margin-bottom: 12px; }
.empty-state h4 { color: var(--text); font-size: 15.5px; margin-bottom: 4px; }

.text-right { text-align: right; }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: 9px;
  border: 1px solid transparent;
  font-size: 13.5px;
  font-weight: 600;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn svg { width: 17px; height: 17px; }

.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 2px 6px var(--primary-glow); }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: #fff; border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #15803d; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 7px 13px; font-size: 12.5px; }

/* ============ FORMS ============ */
.form-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 14px 16px; }
.grid-2 > *, .form-grid > * { min-width: 0; }

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 12.5px; font-weight: 600; color: var(--text); }
.form-group input, .form-group select {
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 0 12px;
  font-size: 14px;
  outline: none;
  background: #fff;
  transition: border 0.15s, box-shadow 0.15s;
  width: 100%;
  max-width: 100%;
}
.form-group textarea {
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
  background: #fff;
  width: 100%;
  max-width: 100%;
  resize: vertical;
}
.form-group input:focus, .form-group select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12); }
.form-group input[type="date"] { cursor: pointer; }
.form-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

.search-row { display: flex; gap: 10px; flex-wrap: wrap; }
.search-row .form-group { flex: 1; min-width: 160px; }

/* ============ MODAL ============ */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(15, 42, 94, 0.5);
  backdrop-filter: blur(3px);
  display: none;
  align-items: flex-start;
  justify-content: center;
  z-index: 100;
  padding: 40px 20px;
  overflow-y: auto;
}
.modal-overlay.open { display: flex; }

.modal {
  background: #fff;
  border-radius: 16px;
  width: 100%;
  max-width: 520px;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.22s ease;
}
@keyframes modalIn { from { transform: translateY(18px); opacity: 0; } to { transform: none; opacity: 1; } }

.modal-header { padding: 18px 22px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.modal-header h3 { font-size: 16px; font-weight: 700; }
.modal-header .x { width: 32px; height: 32px; border: none; background: var(--bg); border-radius: 8px; display: grid; place-items: center; color: var(--text-muted); }
.modal-header .x:hover { background: var(--danger-soft); color: var(--danger); }
.modal-body { padding: 22px; }
.modal-footer { padding: 16px 22px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

/* Toast */
.toast-wrap { position: fixed; bottom: 24px; right: 24px; display: flex; flex-direction: column; gap: 10px; z-index: 200; }
.toast {
  background: #fff;
  border: 1px solid var(--border);
  border-left: 4px solid var(--success);
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  padding: 13px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  font-weight: 600;
  min-width: 240px;
  animation: toastIn 0.25s ease;
}
.toast.err { border-left-color: var(--danger); }
.toast svg { width: 18px; height: 18px; color: var(--success); flex-shrink: 0; }
.toast.err svg { color: var(--danger); }
@keyframes toastIn { from { transform: translateX(40px); opacity: 0; } to { transform: none; opacity: 1; } }

/* ============ DASHBOARD EXTRA ============ */
.summary-legend { display: flex; gap: 22px; flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-muted); }
.legend-dot { width: 12px; height: 12px; border-radius: 4px; }

.progress-bar { height: 10px; background: var(--bg); border-radius: 8px; overflow: hidden; margin: 14px 0; }
.progress-fill { height: 100%; border-radius: 8px; background: linear-gradient(90deg, var(--primary-light), var(--primary)); transition: width 0.8s ease; }

.mini-list { display: flex; flex-direction: column; }
.mini-item { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--border); }
.mini-item:last-child { border-bottom: none; }
.mini-item .s-avatar { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 14px; flex-shrink: 0; }
.mini-item .mini-name { font-weight: 600; font-size: 13.5px; }
.mini-item .mini-sub { font-size: 12px; color: var(--text-muted); }

/* Donut */
.donut-wrap { display: flex; align-items: center; justify-content: center; gap: 26px; flex-wrap: wrap; }
.donut { width: 150px; height: 150px; }

.quick-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.quick-btn {
  border: 1px dashed var(--border);
  background: #fff;
  border-radius: 11px;
  padding: 16px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text);
  transition: all 0.15s;
}
.quick-btn svg { width: 22px; height: 22px; color: var(--primary); }
.quick-btn:hover { border-color: var(--primary); background: var(--primary-soft); transform: translateY(-2px); }

/* ============ ATTENDANCE ============ */
.att-row { display: flex; align-items: center; justify-content: space-between; }
.att-controls { display: flex; gap: 8px; }
.att-btn {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.13s;
}
.att-btn:hover { border-color: var(--primary); color: var(--primary); }
.att-btn.on-p { background: var(--success); border-color: var(--success); color: #fff; }
.att-btn.on-a { background: var(--danger); border-color: var(--danger); color: #fff; }
.att-btn.on-l { background: var(--warning); border-color: var(--warning); color: #fff; }

.att-summary { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 16px; }
.att-chip { flex: 1; min-width: 120px; border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; text-align: center; background: #fff; }
.att-chip .num { font-size: 21px; font-weight: 800; }
.att-chip .lbl { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* History accordion */
.history-item { border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; overflow: hidden; }
.history-head { display: flex; align-items: center; justify-content: space-between; padding: 13px 16px; cursor: pointer; background: #f8fafc; }
.history-head:hover { background: #f1f5f9; }
.history-head .h-date { font-weight: 700; font-size: 13.5px; display: flex; align-items: center; gap: 9px; }
.history-head .h-date svg { color: var(--primary); }
.history-body { display: none; padding: 6px 16px 14px; }
.history-item.open .history-body { display: block; }
.history-item.open .chev { transform: rotate(180deg); }
.chev { transition: transform 0.2s; color: var(--text-muted); }

/* ============ RESPONSIVE ============ */
@media (max-width: 1100px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); box-shadow: 0 0 0 100vmax rgba(15, 42, 94, 0.45); }
  .main { margin-left: 0; }
  .hamburger { display: grid; }
  .search-box { display: none; }
}

@media (max-width: 640px) {
  html { font-size: 14px; }
  .content { padding: 16px; }
  .topbar { padding: 0 14px; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-card { padding: 14px; }
  .stat-card .stat-icon { width: 44px; height: 44px; }
  .stat-card .stat-info h3 { font-size: 21px; }
  .form-grid { grid-template-columns: 1fr; }
  .quick-grid { grid-template-columns: repeat(2, 1fr); }
  .modal-overlay { padding: 20px 14px; }
  .att-row { flex-direction: column; align-items: flex-start; gap: 10px; }
  .att-controls { width: 100%; justify-content: space-between; }
  .att-controls .att-btn { flex: 1; text-align: center; }
  .toast-wrap { left: 14px; right: 14px; }
  .toast { min-width: 0; width: 100%; }
  #topbarTitleSub { display: none; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .topbar-title p { display: none; }
  .section-head { flex-direction: column; align-items: flex-start; }
  .section-actions { width: 100%; }
  .section-actions .btn { flex: 1; justify-content: center; }
}

/* ==========================================================
   MOBILE APP LAYOUT (separate, phone-app style)
   - Preview on any screen: add body.force-mobile
   - OR automatically when viewport < 992px
   ========================================================== */
.mobile-app { display: none; }

body.force-mobile .desktop-only { display: none !important; }
body.force-mobile .mobile-app { display: block !important; }

/* Phone-frame preview on desktop: center like a phone */
body.force-mobile .m-header { max-width: 520px; width: 100%; margin: 0 auto; border-radius: 0 0 22px 22px; }
body.force-mobile .m-content { max-width: 520px; }
body.force-mobile .m-tabs { left: 50%; right: auto; transform: translateX(-50%); width: 520px; max-width: 94vw; }
body.force-mobile .m-save-bar { width: 520px; max-width: 94vw; left: 50%; right: auto; transform: translateX(-50%); }
body.force-mobile .fab { right: calc(50vw - 276px); }

@media (max-width: 991px) {
  html { font-size: 15px; }
  body { background: #eef2f7; }
  .desktop-only { display: none; }
  .mobile-app { display: block; }
}

/* ---- App bar (gradient, app-style) ---- */
.m-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 18px 17px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary) 60%, var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 18px var(--primary-glow);
  border-radius: 0 0 20px 20px;
}
.m-header-brand { display: flex; align-items: center; gap: 11px; }
.m-header .logo-badge { width: 40px; height: 40px; font-size: 18px; background: rgba(255,255,255,.2); color: #fff; box-shadow: none; }
.m-header-title { color: #fff; font-weight: 800; font-size: 18px; letter-spacing: -0.3px; }
.m-header-sub { font-size: 11.5px; color: rgba(255,255,255,.8); }
.m-header-actions { display: flex; gap: 9px; align-items: center; }
.m-header-actions .icon-btn { background: rgba(255,255,255,.16); border: none; color: #fff; }
.m-header-actions .icon-btn .dot { background: #fde047; }
.m-header-actions .avatar { background: rgba(255,255,255,.24); color: #fff; }

.m-content {
  padding: 16px 15px 176px;
  max-width: 640px;
  margin: 0 auto;
}

.m-section-title {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: #8aa0c0;
  margin: 18px 4px 10px;
}

/* ---- Cards ---- */
.m-card {
  background: #fff;
  border: 1px solid rgba(226, 232, 240, 0.9);
  border-radius: 16px;
  box-shadow: 0 2px 12px rgba(15, 42, 94, 0.07);
  margin-bottom: 14px;
  overflow: hidden;
}
.m-card-head {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 700;
  font-size: 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.m-card-body { padding: 14px 16px; }

/* ---- Stats ---- */
.m-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.m-stat {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 14px;
  box-shadow: 0 2px 12px rgba(15, 42, 94, 0.06);
}
.m-stat-card .m-stat-icon {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  margin-bottom: 10px;
}
.m-stat-card .m-stat-icon svg { width: 21px; height: 21px; }
.m-stat-card .m-stat-number { font-size: 22px; font-weight: 800; letter-spacing: -0.5px; }
.m-stat-card .m-stat-label { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.m-stat-trend { font-size: 11px; margin-top: 5px; font-weight: 600; color: var(--primary-light); }

/* ---- Lists ---- */
.m-list { display: flex; flex-direction: column; }
.m-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.m-row:last-child { border-bottom: none; }
.m-row .s-avatar,
.m-list .s-avatar { width: 38px; height: 38px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 14px; flex-shrink: 0; }
.m-row .mini-name { font-weight: 600; font-size: 13.5px; }
.m-row .mini-sub { font-size: 12px; color: var(--text-muted); }

/* ---- Quick actions ---- */
.m-quick { display: flex; gap: 10px; overflow-x: auto; padding: 2px 2px 6px; scrollbar-width: none; }
.m-quick::-webkit-scrollbar { display: none; }
.m-qbtn {
  flex: 0 0 auto;
  width: 78px;
  background: #f8fafc;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 13px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text);
  transition: transform .12s;
}
.m-qbtn:active { transform: scale(0.92); }
.m-qbtn svg { width: 23px; height: 23px; color: var(--primary); }

/* ---- Filter chips ---- */
.m-chips { display: flex; gap: 8px; overflow-x: auto; padding: 4px 2px 10px; scrollbar-width: none; }
.m-chips::-webkit-scrollbar { display: none; }
.m-chip {
  flex: 0 0 auto;
  padding: 9px 15px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: #fff;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.15s;
}
.m-chip.active { background: var(--primary); color: #fff; border-color: var(--primary); box-shadow: 0 4px 12px rgba(26, 86, 219, 0.35); }

.m-searchbar { position: relative; margin-bottom: 12px; }
.m-searchbar input {
  width: 100%;
  height: 46px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  padding: 0 42px 0 42px;
  font-size: 14px;
  outline: none;
  box-shadow: 0 2px 10px rgba(15, 42, 94, 0.05);
}
.m-searchbar input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.12); }
.m-searchbar svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); color: var(--text-muted); }

/* ---- Student cards ---- */
.m-scard {
  display: flex;
  align-items: center;
  gap: 12px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 13px;
  margin-bottom: 10px;
  box-shadow: 0 2px 10px rgba(15, 42, 94, 0.06);
}
.m-scard .s-avatar { width: 44px; height: 44px; border-radius: 13px; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 15px; flex-shrink: 0; }
.m-scard-info { flex: 1; min-width: 0; }
.m-scard-actions { display: flex; gap: 6px; }

/* ---- Attendance cards ---- */
.m-att-card { display: flex; align-items: center; gap: 12px; background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 13px; margin-bottom: 10px; box-shadow: 0 2px 10px rgba(15, 42, 94, 0.06); }
.m-att-card .m-scard-info { flex: 1; }
.m-att-card .att-controls { display: flex; gap: 6px; }
.m-att-card .att-btn { padding: 8px 13px; font-size: 12px; border-radius: 10px; }

@media (max-width: 460px) {
  .m-att-card { flex-direction: column; align-items: stretch; }
  .m-att-card .att-controls { width: 100%; justify-content: space-between; }
  .m-att-card .att-controls .att-btn { flex: 1; text-align: center; }
}

/* ---- Floating action button ---- */
.fab {
  display: flex;
  align-items: center;
  justify-content: center;
  position: fixed;
  right: 18px;
  bottom: 98px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  color: #fff;
  border: none;
  font-size: 32px;
  box-shadow: 0 10px 26px var(--primary-glow);
  z-index: 70;
  transition: transform .12s;
}
.fab:active { transform: scale(0.92); }

/* ---- Bottom tab bar (floating pill) ---- */
.m-tabs {
  position: fixed;
  left: 12px; right: 12px; bottom: 12px;
  display: flex;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 10px 34px rgba(15, 42, 94, 0.22);
  padding: 7px 8px calc(7px + env(safe-area-inset-bottom));
  z-index: 70;
}
.m-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 8px 4px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  border-radius: 18px;
  transition: all 0.18s;
}
.m-tab svg { width: 22px; height: 22px; }
.m-tab.active { color: var(--primary); background: var(--primary-soft); }

/* ---- Bottom sheet dialogs ---- */
body.force-mobile .modal-overlay { align-items: flex-end; padding: 0; }
body.force-mobile .modal { max-width: 100%; border-radius: 22px 22px 0 0; }
body.force-mobile .modal-body { padding: 18px 18px 8px; }
body.force-mobile .modal-footer { padding: 14px 18px calc(16px + env(safe-area-inset-bottom)); }

@media (max-width: 991px) {
  .modal-overlay { align-items: flex-end; padding: 0; }
  .modal { max-width: 100%; border-radius: 22px 22px 0 0; }
  .modal-body { padding: 18px 18px 8px; }
  .modal-footer { padding: 14px 18px calc(16px + env(safe-area-inset-bottom)); }
}

/* ---- Big save button ---- */
.m-save-bar {
  position: fixed;
  left: 0; right: 0; bottom: 82px;
  padding: 10px 15px;
  background: linear-gradient(180deg, transparent, rgba(238, 242, 247, 0.97) 40%);
  z-index: 60;
  display: flex;
}
.m-save-bar .btn { flex: 1; justify-content: center; height: 50px; border-radius: 15px; font-size: 15px; box-shadow: 0 6px 18px rgba(22, 163, 74, 0.35); }
/* ============ MODULES GRID (More / Reports) ============ */
.mod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 14px; }
.mod-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow);
  transition: transform .15s, border-color .15s;
}
.mod-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.mod-card .mod-icon { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; flex-shrink: 0; background: var(--primary-soft); color: var(--primary); }
.mod-card .mod-icon svg { width: 24px; height: 24px; }
.mod-card h4 { font-size: 14.5px; font-weight: 700; }
.mod-card p { font-size: 12.5px; color: var(--text-muted); margin-top: 2px; }

.subject-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.bars { display: flex; flex-direction: column; gap: 12px; }
.bar-row { display: grid; grid-template-columns: 110px 1fr 46px; align-items: center; gap: 10px; font-size: 13px; }
.bar-row .track { height: 10px; background: var(--bg); border-radius: 8px; overflow: hidden; }
.bar-row .fill { height: 100%; border-radius: 8px; background: linear-gradient(90deg, var(--primary-light), var(--primary)); }
.bar-row .val { font-weight: 700; text-align: right; }

.stat-label-l { font-size: 12.5px; color: var(--text-muted); }
.fee-total { font-size: 26px; font-weight: 800; letter-spacing: -0.5px; }

.mini-name { font-weight: 600; font-size: 13.5px; color: inherit; }
.mini-sub { font-size: 12px; color: var(--text-muted); }
.text-right { text-align: right; }

.app-logo.m-logo {
  width: 64px; height: 64px; margin: 0 auto; border-radius: 20px;
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 24px;
  background: linear-gradient(135deg, var(--primary-light), var(--primary)); box-shadow: 0 8px 20px var(--primary-glow);
}

.m-quick-btn {
  flex: 0 0 84px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 6px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  color: var(--text);
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  transition: all .15s;
}
.m-quick-btn svg { width: 22px; height: 22px; color: var(--primary); }
.m-quick-btn:hover { border-color: var(--primary); background: var(--primary-soft); }

/* ============ NOTICES ============ */
.notice-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.notice-item:last-child { border-bottom: none; }
.notice-icon {
  width: 42px; height: 42px; border-radius: 12px; flex-shrink: 0;
  display: grid; place-items: center;
}
.m-card-more { cursor: pointer; font-size: 15px; color: var(--text-muted); padding: 4px 8px; border-radius: 8px; }
.m-card-more:hover { background: var(--bg); color: var(--primary); }

/* ============ LOGIN ============ */
.login-wrap {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 55%, var(--primary-light) 100%);
}
.login-hero {
  position: relative;
  color: #fff;
  padding: 56px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.login-hero h1 { font-size: 40px; font-weight: 800; line-height: 1.15; margin: 18px 0 12px; }
.login-hero p { font-size: 15.5px; opacity: .85; max-width: 420px; line-height: 1.6; }
.login-features { display: flex; flex-direction: column; gap: 14px; margin-top: 34px; }
.login-features div { display: flex; align-items: center; gap: 12px; font-size: 14.5px; opacity: .95; }
.login-features svg { width: 20px; height: 20px; flex-shrink: 0; }
.login-card-wrap { display: flex; align-items: center; justify-content: center; padding: 40px; }
.login-card {
  background: #fff; border-radius: 22px; box-shadow: 0 30px 70px rgba(9, 26, 66, .35);
  padding: 40px 36px; width: 100%; max-width: 420px;
}
.login-card .logo-badge { width: 54px; height: 54px; font-size: 20px; border-radius: 16px; }
.login-card h2 { font-size: 22px; font-weight: 800; margin: 16px 0 4px; }
.login-card .login-sub { font-size: 13.5px; color: var(--text-muted); margin-bottom: 22px; }
.login-card .form-group label { display: block; font-size: 12.5px; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; }
.login-card .btn { height: 48px; width: 100%; justify-content: center; font-size: 14.5px; }
.login-divider { display: flex; align-items: center; gap: 12px; color: var(--text-muted); font-size: 12.5px; margin: 18px 0; }
.login-divider::before, .login-divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }
@media (max-width: 900px) {
  .login-wrap { grid-template-columns: 1fr; }
  .login-hero { display: none; }
  .login-card-wrap { padding: 28px 18px; }
}

/* ============ HUB CARDS (section launcher, app-wide pattern) ============ */
.hub { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 6px; justify-content: center; }
.hub-card { background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 20px 16px; text-align: center; cursor: pointer; transition: transform .12s, box-shadow .12s; width: 100%; }
.hub-card[style*="--hub-ic"] { background: linear-gradient(135deg, color-mix(in srgb, var(--hub-ic) 14%, #ffffff), color-mix(in srgb, var(--hub-ic) 5%, #ffffff)); }
.hub-card[style*="--hub-ic"]:not(.active) { border-color: color-mix(in srgb, var(--hub-ic) 32%, var(--border)); }
.hub-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(15, 23, 42, .12); }
.hub-card.active { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-soft), 0 10px 24px rgba(15, 23, 42, .12); }
.hub-card .ic { width: 52px; height: 52px; margin: 0 auto 10px; border-radius: 16px; display: grid; place-items: center; color: #fff; }
.hub-card .ic svg { width: 24px; height: 24px; }
.hub-card b { display: block; font-size: 15px; }
.hub-card span { font-size: 12px; color: var(--text-muted); }
.hub-card .stat { display: block; margin-top: 6px; font-size: 12px; font-weight: 700; color: var(--hub-ic, var(--primary)); }
.hub-back { margin-bottom: 12px; }
.hub-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1100px) {
  .hub-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .hub { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .hub-card { padding: 14px 10px; }
  .hub-card .ic { width: 44px; height: 44px; }
  .hub-card b { font-size: 13.5px; }
}