/* ============================================================
   Oilo — Mobile & low-bandwidth layer.
   Tuned for slow networks + weak Android devices common in KG:
   • hamburger nav (the desktop menu is hidden < 980px)
   • single-column layouts, 44px+ touch targets
   • heavy pointer effects disabled on touch (.is-touch)
   • reduced motion / no decorative GPU loops on small screens
   ============================================================ */

/* ---- Hamburger button (hidden on desktop) ---- */
.nav-burger { display: none; width: 42px; height: 42px; border: 1px solid var(--line);
  background: var(--surface); border-radius: 11px; cursor: pointer; padding: 0;
  flex-direction: column; align-items: center; justify-content: center; gap: 4px; }
.nav-burger span { display: block; width: 18px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .25s, opacity .2s; }
.nav-burger.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-burger.active span:nth-child(2) { opacity: 0; }
.nav-burger.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---- Mobile drawer ---- */
.m-drawer { position: fixed; inset: 0; z-index: 9997; visibility: hidden; pointer-events: none; }
.m-drawer.open { visibility: visible; pointer-events: auto; }
.m-drawer-backdrop { position: absolute; inset: 0; background: rgba(10,9,8,0.45); opacity: 0; transition: opacity .3s; }
.m-drawer.open .m-drawer-backdrop { opacity: 1; }
.m-drawer-panel { position: absolute; top: 0; right: 0; height: 100%; width: min(82vw, 340px);
  background: var(--bg); border-left: 1px solid var(--line); transform: translateX(100%);
  transition: transform .32s cubic-bezier(.4,0,.2,1); display: flex; flex-direction: column; padding: 20px; }
.m-drawer.open .m-drawer-panel { transform: translateX(0); }
.m-drawer-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.m-drawer-logo { font-family: var(--serif); font-size: 26px; }
.m-drawer-close { width: 40px; height: 40px; border: 1px solid var(--line); background: var(--surface);
  border-radius: 10px; font-size: 24px; line-height: 1; cursor: pointer; color: var(--ink-2); }
.m-drawer-nav { display: flex; flex-direction: column; gap: 4px; }
.m-drawer-nav button { text-align: left; padding: 16px 14px; border: none; background: transparent;
  border-radius: 12px; font-family: var(--display); font-size: 18px; font-weight: 500; color: var(--ink); cursor: pointer; }
.m-drawer-nav button:active { background: color-mix(in oklab, var(--ink) 7%, transparent); }
.m-drawer-foot { margin-top: auto; display: flex; flex-direction: column; gap: 14px; padding-top: 20px; border-top: 1px solid var(--line); }
.m-drawer-lang { display: flex; gap: 8px; }
.m-drawer-lang button { flex: 1; padding: 12px; border: 1px solid var(--line); background: var(--surface);
  border-radius: 10px; font-size: 14px; cursor: pointer; color: var(--ink-2); }
.m-drawer-lang button.on { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.m-drawer-auth { display: flex; flex-direction: column; gap: 8px; }
.m-drawer-auth .btn { width: 100%; padding: 14px; min-height: 48px; }

/* ============================================================
   Touch devices: kill decorative/expensive effects
   ============================================================ */
body.is-touch .cursor-dot,
body.is-touch .cursor-ring { display: none !important; }
body.is-touch * { cursor: auto !important; }
body.is-touch .hero-blob,
body.is-touch .b2b-blob { animation: none !important; }
body.is-touch .magnetic,
body.is-touch .magnetic-inner { transform: none !important; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .08s !important; }
}

/* ============================================================
   ≤ 900px — phones & small tablets (matches styles.css nav bp)
   ============================================================ */
@media (max-width: 900px) {
  .nav-burger { display: flex; }
  /* Desktop menu hidden (styles.css already does this); show burger instead.
     Keep cart + account compact, hide inline login/signup (they live in drawer). */
  .nav-inner { display: flex; align-items: center; justify-content: space-between; }
  .nav-right { gap: 8px; }
  .nav-right .btn-login,
  .nav-right .btn-signup { display: none; }
  .nav-right .lang { display: none; }
  .btn-account .acc-name { display: none; }

  /* Modals / panels become near-fullscreen sheets */
  .modal-panel { width: calc(100vw - 24px) !important; max-width: 560px;
    max-height: 90vh; overflow-y: auto; -webkit-overflow-scrolling: touch; }
  .learn-panel, .test-panel, .ed-panel, .cert-modal, .vm-panel { width: calc(100vw - 24px) !important; }

  /* Tap targets */
  button, .btn, .vp-q, .test-opt, .mng-switch { min-height: 44px; }

  /* Account: stack sidebar over content */
  .acc-layout { grid-template-columns: 1fr !important; }
  .acc-side { position: static !important; }
  .acc-nav { flex-direction: row; flex-wrap: wrap; }
  .acc-nav button, .acc-nav-link { flex: 1 1 auto; }

  /* Management rows wrap */
  .mng-row { flex-wrap: wrap; }
  .mng-row-actions { width: 100%; justify-content: flex-end; }
}

/* ============================================================
   ≤ 560px — small phones
   ============================================================ */
@media (max-width: 560px) {
  .container { padding-left: 18px; padding-right: 18px; }
  .hero { padding-top: 96px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .courses { grid-template-columns: 1fr !important; }
  .cats { grid-template-columns: 1fr !important; }
  .cat { grid-column: auto !important; grid-row: auto !important; }
  .stats { grid-template-columns: 1fr 1fr !important; }
  .checkout-grid { grid-template-columns: 1fr !important; }
  .footer-grid, .foot-cols { grid-template-columns: 1fr !important; }
  .vp-lbl { width: 100%; }
  .promo-create { grid-template-columns: 1fr !important; }
  .promo-stats-grid { grid-template-columns: 1fr 1fr !important; }
  .ed-grid { grid-template-columns: 1fr !important; }
  .vm-quality { gap: 10px; }
  .vm-keep { margin-left: 0; width: 100%; }
  /* Cart drawer full width */
  .cart-panel { width: 100vw !important; }
  /* Bigger base type for readability on cheap panels */
  .lr-actions { flex-direction: column; }
  .lr-actions .btn { width: 100%; }
}

/* Respect the device safe areas (notches) */
@supports (padding: env(safe-area-inset-bottom)) {
  .m-drawer-panel { padding-bottom: calc(20px + env(safe-area-inset-bottom)); }
}