/* =====================================================================
   เก็บเงิน ม.5/6 — responsive.css
   Mobile First · รองรับมือถือ แท็บเล็ต และเดสก์ท็อป
   ===================================================================== */

/* --------------------- ≤ 1200px : ปรับตาราง/การ์ด -------------------- */
@media (max-width: 1200px) {
  .session-row {
    grid-template-columns: minmax(170px, 1.2fr) repeat(2, minmax(96px, .7fr)) minmax(130px, 1fr) auto;
  }
  .session-row .session-metric:nth-of-type(2) { display: none; }
}

/* --------------------- ≤ 1024px : แท็บเล็ตแนวนอน --------------------- */
@media (max-width: 1024px) {
  .page-head-main { max-width: 100%; }
  .page-head-inner { align-items: flex-start; }
  .page-head-side { width: 100%; align-items: flex-end; justify-content: space-between; }

  .stat-grid { grid-template-columns: repeat(auto-fit, minmax(185px, 1fr)); }

  .session-row {
    grid-template-columns: minmax(170px, 1.4fr) minmax(110px, .8fr) minmax(140px, 1fr) auto;
  }
  .session-row .session-metric:nth-of-type(2),
  .session-row .session-metric:nth-of-type(3) { display: none; }

  .report-grid { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); }
  .image-grid { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); }
}

/* --------------------- ≤ 900px : เมนูแอดมินพับเก็บ -------------------- */
@media (max-width: 900px) {
  .admin-sidebar {
    transform: translateX(-100%);
    transition: transform 260ms cubic-bezier(.4, 0, .2, 1);
    z-index: 120;
  }
  .admin-sidebar.is-open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }
  .sidebar-close { display: inline-flex; }
  .admin-main { margin-left: 0; }
  .sidebar-toggle { display: inline-flex; }
  .admin-topbar { padding: 10px 16px; }
  .admin-content { padding: 16px; }
  .hide-sm { display: none; }

  .toolbar-right { width: 100%; }
  .toolbar-right .search-field { flex: 1 1 220px; }
  .toolbar-left { width: 100%; }
}

/* --------------------- ≤ 768px : มือถือแนวนอน ------------------------- */
@media (max-width: 768px) {
  body { font-size: 14.5px; }

  .container { padding-inline: 14px; }

  /* ---------- public nav ---------- */
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .site-nav {
    position: absolute;
    top: calc(var(--header-h) + 6px);
    left: 14px;
    right: 14px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    margin-left: 0;
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .nav-link { justify-content: flex-start; padding: 11px 13px; }
  .header-inner { position: relative; }

  /* ---------- page head ---------- */
  .page-head { padding: 22px 0 18px; }
  .page-head-side { flex-direction: column; align-items: stretch; gap: 10px; }
  .page-head-actions { justify-content: space-between; }
  .filter-row { flex-direction: column; gap: 10px; }
  .filter-row .field { width: 100%; }

  /* ---------- cards & stats ---------- */
  .card { padding: 18px; border-radius: var(--radius); }
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 11px; }
  .stat-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-value { font-size: 1.3rem; }
  .stat-card { padding: 15px; }
  .stat-icon { width: 32px; height: 32px; }
  .stat-icon svg { width: 16px; height: 16px; }

  .progress-head { flex-direction: column; gap: 8px; }
  .progress-percent { font-size: 1.55rem; }

  /* ---------- tables ---------- */
  .data-table { min-width: 600px; font-size: .82rem; }
  .data-table thead th, .data-table tbody td { padding: 10px 12px; }
  .table-toolbar { padding: 16px; align-items: stretch; }
  .table-footer { padding: 11px 16px; }
  .bulk-bar { padding: 12px 16px; }

  /* ---------- admin ---------- */
  .topbar-title h1 { font-size: .95rem; }
  .admin-nav { padding: 6px 10px; }
  .quick-actions { grid-template-columns: 1fr; }
  .report-grid { grid-template-columns: 1fr; }
  .image-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 11px; }

  .modal { max-width: 100%; max-height: calc(100vh - 24px); }
  .modal-head { padding: 16px 16px 12px; }
  .modal-body { padding: 16px; }
  .modal-foot { padding: 12px 16px 16px; }
  .modal-foot .btn { flex: 1 1 auto; }

  .form-grid { grid-template-columns: 1fr; }
  .form-grid .span-2 { grid-column: auto; }

  /* ---------- session list ---------- */
  .session-row { grid-template-columns: 1fr auto; gap: 12px; padding: 14px 16px; }
  .session-row .session-metric { display: none; }
  .session-actions { grid-column: 2; grid-row: 1; align-self: start; }
  .session-date { grid-column: 1; }
  .session-detail { padding: 0 16px 16px; }

  .toast-root { top: 12px; right: 12px; left: 12px; width: auto; }

  .cta-card { flex-direction: column; align-items: stretch; }
  .cta-card .btn { width: 100%; }
}

/* --------------------- ≤ 560px : มือถือแนวตั้ง ------------------------ */
@media (max-width: 560px) {
  h1 { font-size: 1.35rem; }
  .brand-text small { display: none; }
  .brand-mark { width: 38px; height: 38px; border-radius: 11px; }
  .brand-mark svg { width: 20px; height: 20px; }

  .stat-grid, .stat-grid-4 { grid-template-columns: 1fr; }
  .stat-card { flex-direction: row; align-items: center; gap: 14px; }
  .stat-card-top { flex-direction: row-reverse; gap: 14px; }
  .stat-value { font-size: 1.22rem; }

  .page-head-actions { flex-wrap: wrap; gap: 8px; }
  .page-head-actions .btn { flex: 1 1 auto; }

  .toolbar-right > * { flex: 1 1 100%; }
  .field-compact select { min-width: 0; width: 100%; }
  .search-field { min-width: 0; }

  .filter-row .btn { width: 100%; }

  .btn { padding: 10px 14px; }
  .btn-lg { padding: 12px 18px; }

  .auth-card { padding: 24px 18px 20px; }
  .admin-content { padding: 12px; }

  .image-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gallery-strip { grid-template-columns: repeat(auto-fill, minmax(78px, 1fr)); }

  .footer-inner { flex-direction: column; align-items: flex-start; gap: 4px; }
}

/* --------------------- ≥ 1400px : จอใหญ่ ----------------------------- */
@media (min-width: 1400px) {
  .container { max-width: 1320px; }
  .stat-grid { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
}

/* --------------------- หน้า "จ่ายเงิน" (pay.html) --------------------- */
@media (max-width: 768px) {
  .pay-slip-grid { grid-template-columns: 1fr; gap: 16px; }
  .pay-qr img { max-width: 220px; }
  .pay-toolbar { gap: 10px; }
  .pay-filter { width: 100%; justify-content: space-between; }
  .pay-filter-btn { flex: 1 1 auto; justify-content: center; padding: 7px 10px; }
  .pay-student-bar { gap: 12px; }
  .pay-student-bar > .btn { margin-left: 0; width: 100%; }
}

@media (max-width: 560px) {
  .pay-search-card { padding: 18px; }
  .student-pick-grid { grid-template-columns: 1fr; }
  .pay-item { flex-direction: column; align-items: stretch; }
  .pay-item-side { margin-left: 0; justify-content: space-between; }
  .pay-item-side .btn { flex: 1 1 auto; }
  .pay-summary-chip { flex: 1 1 calc(50% - 5px); }
  .pay-student-avatar { width: 42px; height: 42px; border-radius: 13px; }
  .pay-amount-value { font-size: 1.6rem; }
  .pay-slip-steps { font-size: .8rem; }
}

/* --------------------- Accessibility / Print ------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}

@media print {
  .site-header, .site-footer, .admin-sidebar, .admin-topbar,
  .toolbar-right, .bulk-bar, .btn, .loading-overlay, .toast-root {
    display: none !important;
  }
  body { background: #fff; }
  .card { box-shadow: none; border-color: #ddd; page-break-inside: avoid; }
  .admin-main { margin-left: 0; }
  .data-table { min-width: 0; }
}