/* ============================================================
   DRAWER-ANIMATIONS.CSS — Анимации мобильного меню
   Gramaton.pro — Личный кабинет
   ============================================================ */

/* ---------- Ключевые кадры ---------- */
@keyframes drawerSlideIn {
  from {
    transform: translate3d(-100%, 0, 0);
  }
  to {
    transform: translate3d(0, 0, 0);
  }
}

@keyframes drawerSlideOut {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(-100%, 0, 0);
  }
}

@keyframes backdropFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes backdropFadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes burgerToCross {
  0% {
    transform: none;
    opacity: 1;
  }
  100% {
    /* Контролируется JS + трансформациями */
  }
}

@keyframes staggerItemIn {
  from {
    opacity: 0;
    transform: translateX(-12px);
    filter: blur(4px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
    filter: blur(0);
  }
}

@keyframes fadeScaleParallax {
  from {
    transform: scale(1) translate3d(0, 0, 0);
  }
  to {
    transform: scale(0.96) translate3d(85%, 0, 0);
  }
}

/* ---------- Кастомные easing-функции ---------- */
:root {
  --ease-premium: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --drawer-duration: 350ms;
  --drawer-width-percent: 85%;
  --stagger-delay-base: 30ms;
  --parallax-scale: 0.96;
}

/* ---------- Drawer основная анимация ---------- */
.lk-drawer {
  animation: none;
  transition: transform var(--drawer-duration) var(--ease-premium);
}

.lk-drawer.open {
  animation: drawerSlideIn var(--drawer-duration) var(--ease-premium) forwards;
}

.lk-drawer.closing {
  animation: drawerSlideOut var(--drawer-duration) var(--ease-premium) forwards;
}

/* ---------- Backdrop с размытием ---------- */
.lk-drawer-backdrop {
  transition: opacity var(--drawer-duration) var(--ease-premium),
              backdrop-filter var(--drawer-duration) ease;
}

.lk-drawer-backdrop.active {
  animation: backdropFadeIn var(--drawer-duration) var(--ease-premium) forwards;
}

.lk-drawer-backdrop:not(.active) {
  animation: backdropFadeOut var(--drawer-duration) var(--ease-premium) forwards;
}

/* ---------- Бургер → Крестик ---------- */
.burger-btn .burger-line {
  transition: all var(--drawer-duration) var(--ease-premium);
}

/* ---------- Stagger-эффект появления пунктов меню ---------- */
.drawer-item {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  will-change: transform, opacity;
}

/* Индексы для stagger устанавливаются через JS inline style */
.lk-drawer.open .drawer-item {
  animation: staggerItemIn 0.35s var(--ease-premium) forwards;
  animation-delay: calc(var(--item-index, 0) * 30ms);
}

/* ---------- Параллакс контента при открытом Drawer ---------- */
.lk-grid.drawer-open .lk-main {
  transition: transform var(--drawer-duration) var(--ease-premium);
  will-change: transform;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.lk-grid.drawer-open .lk-topbar {
  transition: transform var(--drawer-duration) var(--ease-premium);
  will-change: transform;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* ---------- Анимация появления/исчезновения окон при свайпе ---------- */
.lk-chat.slide-in {
  animation: chatSlideIn 0.3s var(--ease-premium) forwards;
}

.lk-chat.slide-out {
  animation: chatSlideOut 0.3s var(--ease-premium) forwards;
}

.lk-contacts.slide-in {
  animation: chatSlideIn 0.3s var(--ease-premium) forwards;
}

.lk-contacts.slide-out {
  animation: chatSlideOut 0.3s var(--ease-premium) forwards;
}

@keyframes chatSlideIn {
  from {
    transform: translate3d(100%, 0, 0);
    opacity: 0.5;
  }
  to {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
}

@keyframes chatSlideOut {
  from {
    transform: translate3d(0, 0, 0);
    opacity: 1;
  }
  to {
    transform: translate3d(-100%, 0, 0);
    opacity: 0.5;
  }
}

/* ---------- Haptic-подготовка (микро-анимация при тапе) ---------- */
.burger-btn:active .burger-line,
.drawer-item:active {
  transform: scale(0.95);
  transition: transform 0.1s ease;
}

/* ---------- Прелоад анимаций (убираем flash) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .lk-drawer,
  .lk-drawer-backdrop,
  .burger-btn .burger-line,
  .drawer-item,
  .lk-main,
  .lk-topbar {
    /* GPU-композитинг включен по умолчанию */
    transform-style: preserve-3d;
  }
}