/* ============================================================
   CSS-ONLY ANIMATIONS & TRANSITIONS
   Замена JavaScript анимаций на CSS для производительности
   ============================================================ */

/* ============================================================
   1. SMOOTH SCROLL (вместо smooth-scroll.js)
   ============================================================ */
html {
    scroll-behavior: smooth;
}

/* Для якорных ссылок */
:target {
    scroll-margin-top: 160px; /* Учитываем sticky navbar + верхний баннер */
}

/* ============================================================
   2. CARD ANIMATIONS (вместо card-animations.js)
   Мягкие, приятные эффекты при наведении
   ============================================================ */
.card {
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), 
                box-shadow 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform, box-shadow;
}

@media (hover: hover) and (pointer: fine) {
    .card:hover {
        transform: translateY(-6px);
        box-shadow: 
            0 20px 40px rgba(0, 0, 0, 0.08),
            0 8px 16px rgba(0, 0, 0, 0.04);
    }
}

/* Card с изображением - мягкий zoom */
.card-img-top,
.card-img {
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (hover: hover) and (pointer: fine) {
    .card:hover .card-img-top,
    .card:hover .card-img {
        transform: scale(1.05);
    }
}

/* Overflow hidden для card чтобы изображение не вылезало */
.card {
    overflow: hidden;
}

/* Появление карточек при загрузке */
.card {
    animation: card-appear 0.4s cubic-bezier(0.4, 0, 0.2, 1) both;
}

/* Задержки для каскадного появления */
.card:nth-child(1) { animation-delay: 0s; }
.card:nth-child(2) { animation-delay: 0.05s; }
.card:nth-child(3) { animation-delay: 0.1s; }
.card:nth-child(4) { animation-delay: 0.15s; }
.card:nth-child(5) { animation-delay: 0.2s; }
.card:nth-child(6) { animation-delay: 0.25s; }
.card:nth-child(n+7) { animation-delay: 0.3s; }

@keyframes card-appear {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.98);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ============================================================
   3. PAGE TRANSITIONS (вместо page-transitions.js)
   Мягкие, едва заметные переходы между страницами
   ============================================================ */
@view-transition {
    navigation: auto;
}

/* Отключаем для HTMX запросов (частичных обновлений) */
html.htmx-request::view-transition-old(root) {
    animation: none !important;
}

html.htmx-request::view-transition-new(root) {
    animation: none !important;
}

/* Старая страница - мягко исчезает */
::view-transition-old(root) {
    animation: page-fade-out 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Новая страница - мягко появляется с лёгким подъёмом */
::view-transition-new(root) {
    animation: page-fade-in 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes page-fade-out {
    0% { 
        opacity: 1; 
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
    100% { 
        opacity: 0; 
        transform: translateY(-8px) scale(0.99);
        filter: blur(2px);
    }
}

@keyframes page-fade-in {
    0% { 
        opacity: 0; 
        transform: translateY(12px) scale(0.99);
        filter: blur(2px);
    }
    100% { 
        opacity: 1; 
        transform: translateY(0) scale(1);
        filter: blur(0);
    }
}

/* Fallback для браузеров без View Transitions */
.htmx-swapping {
    opacity: 0.85;
    transform: translateY(-4px);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Анимация появления нового контента через HTMX */
.htmx-settling {
    animation: htmx-content-appear 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes htmx-content-appear {
    0% {
        opacity: 0;
        transform: translateY(8px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   4. PARALLAX EFFECT (вместо parallax.js)
   ============================================================ */
.parallax-bg {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

/* Для мобильных устройств отключаем fixed (iOS issues) */
@media (max-width: 768px) {
    .parallax-bg {
        background-attachment: scroll;
    }
}

/* ============================================================
   5. SKELETON LOADING (вместо skeleton-loading.js)
   Мягкая пульсация, не раздражающая глаза
   ============================================================ */
.skeleton {
    background: linear-gradient(
        110deg, 
        rgba(255, 255, 255, 0.06) 8%, 
        rgba(255, 255, 255, 0.1) 18%, 
        rgba(255, 255, 255, 0.06) 33%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.8s ease-in-out infinite;
    border-radius: 6px;
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
}

.skeleton-title {
    height: 1.5em;
    width: 60%;
    margin-bottom: 0.75em;
}

.skeleton-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.skeleton-image {
    width: 100%;
    height: 200px;
    border-radius: 8px;
}

.skeleton-button {
    width: 100px;
    height: 38px;
    border-radius: 6px;
}

@keyframes skeleton-shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

/* Пульсирующий skeleton (альтернатива) */
.skeleton-pulse {
    background: rgba(255, 255, 255, 0.08);
    animation: skeleton-pulse-anim 2s ease-in-out infinite;
}

@keyframes skeleton-pulse-anim {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ============================================================
   6. LAZY LOADING IMAGES (вместо lazy-loading.js)
   Используем нативный loading="lazy" + CSS fade-in
   ============================================================ */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img[loading="lazy"].loaded,
img[loading="lazy"]:not([data-src]) {
    opacity: 1;
}

/* Placeholder пока изображение загружается */
.lazy-image-container {
    background: rgba(255, 255, 255, 0.08);
    position: relative;
    overflow: hidden;
}

.lazy-image-container::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255,255,255,0.4), 
        transparent);
    animation: lazy-shimmer 1.5s infinite;
}

@keyframes lazy-shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ============================================================
   7. HTMX LOADING INDICATORS
   ============================================================ */
.htmx-indicator {
    display: none;
}

.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator {
    display: inline-block;
}

/* Spinner */
.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Кнопка в состоянии загрузки */
button.htmx-request {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

button.htmx-request::after {
    content: "";
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: button-spinner 0.6s linear infinite;
}

@keyframes button-spinner {
    to { transform: translateY(-50%) rotate(360deg); }
}

/* ============================================================
   8. INFINITE SCROLL TRIGGER
   ============================================================ */
.infinite-scroll-trigger {
    padding: 2rem;
    text-align: center;
}

.infinite-scroll-trigger .spinner-border {
    width: 2rem;
    height: 2rem;
}

/* ============================================================
   9. FORM VALIDATION FEEDBACK (анимации)
   ============================================================ */
.valid-feedback,
.invalid-feedback {
    animation: feedback-slide-in 0.2s ease;
}

@keyframes feedback-slide-in {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Shake animation для ошибок */
.is-invalid {
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* ============================================================
   10. TOAST NOTIFICATIONS (анимации)
   ============================================================ */
.toast {
    animation: toast-slide-in 0.3s ease;
}

@keyframes toast-slide-in {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.hiding {
    animation: toast-slide-out 0.2s ease forwards;
}

@keyframes toast-slide-out {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* ============================================================
   11. BUTTON INTERACTIONS
   Мягкие, приятные эффекты для кнопок
   ============================================================ */
.btn {
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

@media (hover: hover) and (pointer: fine) {
  .btn:hover:not(:disabled) {
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  }

  /* Primary button glow effect */
  .btn-primary:hover {
      box-shadow: 0 4px 20px rgba(var(--bs-primary-rgb, 13, 110, 253), 0.4);
  }
}

.btn:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Ripple effect (pure CSS) */
.btn-ripple {
    position: relative;
    overflow: hidden;
}

.btn-ripple::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    background-image: radial-gradient(circle, rgba(255,255,255,0.3) 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform 0.5s, opacity 1s;
}

.btn-ripple:active::after {
    transform: scale(0, 0);
    opacity: 0.4;
    transition: 0s;
}

/* ============================================================
   12. NAVBAR SCROLL SHADOW (CSS-only)
   ============================================================ */
.navbar {
    transition: box-shadow 0.35s ease, 
                background-color 0.35s ease,
                backdrop-filter 0.35s ease;
}

/* Будет добавляться через JS при скролле */
.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
}

/* ============================================================
   13. FOCUS STATES (Accessibility)
   Мягкое, заметное но не резкое выделение
   ============================================================ */
:focus-visible {
    outline: 2px solid rgba(var(--bs-primary-rgb, 59, 130, 246), 0.5);
    outline-offset: 3px;
    transition: outline-offset 0.15s ease;
}

/* ============================================================
   14. REDUCED MOTION
   Уважаем настройки пользователя
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================================
   15. SUBTLE BACKGROUND EFFECTS
   Едва заметные фоновые эффекты для атмосферы
   ============================================================ */

/* Мягкий градиент на главном контенте */
main {
    position: relative;
}

/* Опционально: мягкое свечение при наведении на интерактивные элементы */
a:not(.btn):not(.nav-link) {
    transition: color 0.2s ease, opacity 0.2s ease;
}

a:not(.btn):not(.nav-link):hover {
    opacity: 0.85;
}

/* ============================================================
   16. SMOOTH SCROLLBAR (webkit browsers)
   ============================================================ */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid transparent;
    background-clip: padding-box;
}

/* ============================================================
   15. ENGAGE BUTTONS (Like, Subscribe, etc.)
   HTMX-powered social interaction buttons
   ============================================================ */
.engage-chip {
    display: inline-flex;
}

.engage-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.65);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.engage-btn:hover {
    background: rgba(255, 255, 255, 0.14);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.engage-btn:active {
    transform: scale(0.95);
}

.engage-btn--active {
    background: linear-gradient(135deg, #ef4444, #f97316);
    border-color: #ef4444;
    color: white;
}

.engage-btn--active:hover {
    background: linear-gradient(135deg, #dc2626, #ea580c);
}

.engage-icon {
    font-size: 16px;
}

.engage-label {
    font-weight: 500;
}

.engage-count {
    font-weight: 600;
    padding-left: 4px;
}

/* Animation when toggled */
@keyframes engagePop {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.engage-btn.htmx-settling .engage-icon {
    animation: engagePop 0.3s ease;
}