/* ═══════════════════════════════════════════════════════
   TEACHER PORTAL — responsive.css
   All @media queries for the teacher dashboard.
   ═══════════════════════════════════════════════════════ */

/* ── 1280px: 4-col stats → 2-col ── */
@media (max-width: 1280px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ── 1024px: multi-col layouts collapse ── */
@media (max-width: 1024px) {
  .assignments-layout { grid-template-columns: 1fr; }
  .profile-layout     { grid-template-columns: 1fr; }
  .analytics-grid     { grid-template-columns: 1fr; }
  .chart-card.chart-wide { grid-column: auto; }
  .main-content { padding: 24px 20px; }
}

/* ── 768px: sidebar slides off-screen, topnav adjusts ── */
@media (max-width: 768px) {
  :root { --sidebar-w: 260px; }

  /* Sidebar: off-screen by default, slides in with .open */
  .sidebar {
    transform: translateX(calc(-1 * var(--sidebar-w)));
    box-shadow: none;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 32px rgba(0,0,0,0.35);
  }

  /* Overlay dimmer when sidebar is open */
  .sidebar.open::after {
    content: '';
    position: fixed;
    inset: 0;
    left: var(--sidebar-w);
    background: rgba(0,0,0,0.45);
    z-index: -1;
  }

  .main-wrap { margin-left: 0 !important; }

  /* Topnav */
  .topnav { padding: 0 14px; gap: 8px; }
  .topnav-name { display: none; }
  .topnav-divider { display: none; }
  .topnav-logout-btn { padding: 7px 12px; font-size: 0.78rem; }

  /* Breadcrumb tighter */
  .topnav-breadcrumb { font-size: 0.85rem; }

  /* Section content */
  .main-content { padding: 18px 14px; }
  .section-title { font-size: 1.25rem; }
  .section-header { margin-bottom: 20px; }

  /* Stats */
  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 18px;
  }
  .stat-card { padding: 16px 14px 12px; gap: 10px; }
  .stat-number { font-size: 1.4rem; }
  .stat-icon-wrap { width: 38px; height: 38px; }
  .stat-trend { display: none; }

  /* Dashboard panels: single column */
  .dashboard-panels { grid-template-columns: 1fr; gap: 14px; }
  .dash-panel { padding: 18px; }

  /* Form rows become single column */
  .form-row { grid-template-columns: 1fr; gap: 0; }

  /* Form card */
  .form-card { padding: 20px; }
  .form-actions { flex-direction: column; }
  .form-actions .btn-primary,
  .form-actions .btn-ghost { width: 100%; justify-content: center; }

  /* Table toolbar */
  .table-toolbar {
    flex-wrap: wrap;
    gap: 10px;
  }
  .table-toolbar .search-input {
    min-width: 0;
    flex: 1 1 100%;
  }
  .table-toolbar > div { width: 100%; }
  .table-toolbar > div .btn-primary,
  .table-toolbar > div .btn-ghost {
    flex: 1;
    justify-content: center;
    text-align: center;
  }

  /* Assignments layout */
  .assignments-layout { grid-template-columns: 1fr; }

  /* Analytics charts: smaller height */
  .chart-wrap { height: 200px; }
  .chart-wrap canvas { max-height: 200px; }

  /* Profile */
  .profile-layout { grid-template-columns: 1fr; }
  .profile-avatar-card { padding: 24px; }

  /* Modals */
  .modal-overlay { align-items: flex-end; padding: 0; }
  .modal-box {
    max-width: 100%;
    width: 100%;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: 24px 20px 32px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.4,0,0.2,1), opacity 0.22s;
  }
  .modal-overlay.open .modal-box {
    transform: translateY(0);
    opacity: 1;
  }
  /* Add a drag handle hint to bottom-sheet modals */
  .modal-box::before {
    content: '';
    display: block;
    width: 40px;
    height: 4px;
    background: var(--border);
    border-radius: 4px;
    margin: 0 auto 18px;
  }
  .modal-box-wide { max-width: 100%; }
  .modal-footer {
    flex-direction: column-reverse;
    gap: 8px;
  }
  .modal-footer .btn-primary,
  .modal-footer .btn-ghost,
  .modal-footer .btn-danger {
    width: 100%;
    justify-content: center;
    text-align: center;
  }
  .modal-box .form-row { grid-template-columns: 1fr; gap: 0; }

  /* Attendance controls */
  .att-controls { flex-direction: column; align-items: stretch; gap: 12px; }
  .att-controls-left { flex-direction: column; align-items: stretch; gap: 10px; }
  .att-controls-right {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }
  .att-controls-right .btn-ghost { justify-content: center; text-align: center; }
  .att-field { margin-bottom: 0; }
  .att-field .field-input,
  .att-field .field-select { min-width: 100%; width: 100%; }
  #att-load-btn { width: 100%; justify-content: center; }

  /* Attendance summary */
  .att-summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    padding: 16px;
  }
  .att-summary-divider { display: none; }
  .att-summary-item { padding: 0; align-items: flex-start; }
  .att-summary-num { font-size: 1.3rem; }
  .att-summary-bar-wrap {
    grid-column: 1 / -1;
    min-width: 100%;
    margin-left: 0;
    margin-top: 4px;
    height: 8px;
  }

  /* Attendance footer */
  .att-footer { flex-direction: column; align-items: stretch; gap: 8px; }
  .att-footer .btn-primary { width: 100%; justify-content: center; }
  .att-footer .error-msg { text-align: center; }

  /* Toast */
  .toast {
    bottom: 16px;
    right: 14px;
    left: 14px;
    max-width: none;
    text-align: center;
  }

  /* Students section action buttons */
  #btn-add-student,
  #btn-auto-mark-inactive {
    flex: 1;
    justify-content: center;
    text-align: center;
    font-size: 0.78rem;
    padding: 8px 10px;
  }

  /* Collapse btn label */
  .collapse-btn-label { display: none; }
  .sidebar-collapse-btn { padding: 7px 10px; }
}

/* ── 480px: single column everything ── */
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .stat-card { padding: 14px 12px 10px; }
  .stat-number { font-size: 1.25rem; }
  .stat-label { font-size: 0.72rem; }
  .stat-icon-wrap { width: 34px; height: 34px; }

  .main-content { padding: 14px 12px; }

  .topnav { padding: 0 10px; }
  .topnav-right { gap: 8px; }
  .topnav-icon-btn { width: 34px; height: 34px; }

  .section-title { font-size: 1.1rem; }

  /* Form card full padding reduction */
  .form-card { padding: 16px 14px; }

  /* Profile avatar smaller */
  .profile-avatar-circle { width: 64px; height: 64px; font-size: 1.4rem; }

  /* Attendance summary 2x2 grid */
  .att-summary { grid-template-columns: 1fr 1fr; }

  /* Hide non-essential table columns on very small screens */
  .data-table .col-hide-mobile { display: none; }

  /* Chart height reduction */
  .chart-wrap { height: 170px; }
  .chart-wrap canvas { max-height: 170px; }

  /* Table card padding tighter */
  .data-table th { padding: 10px 12px; font-size: 0.65rem; }
  .data-table td { padding: 11px 12px; }
}

/* ── 360px: ultra-narrow phones ── */
@media (max-width: 360px) {
  .stats-grid { grid-template-columns: 1fr; }
  .topnav-logout-btn { padding: 4px 8px; font-size: 0.70rem; }
  .sidebar-collapse-btn { padding: 6px 8px; }
  .att-controls-right { grid-template-columns: 1fr; }
}

/* ── Mobile: icon-only sidebar responsive ── */
@media (max-width: 768px) {
  .sidebar-icon-only {
    width: var(--sidebar-w);
    transform: translateX(calc(-1 * var(--sidebar-w)));
  }
  .sidebar-icon-only.open {
    transform: translateX(0);
    width: var(--sidebar-w);
  }
}