/* ===== CROSS-BROWSER COMPATIBILITY ===== */
/* Support: Chrome, Firefox, Safari, Edge, Opera, Yandex Browser */

/* ===== FLEXBOX FALLBACKS ===== */
/* Safari < 9, older browsers */
.preloader,
.preloader__counter,
.preloader__hint,
.header__inner,
.header__left,
.header__nav,
.nav__list,
.nav__item,
.nav__link,
.nav__sub,
.header__contacts,
.header__phone,
.burger,
.mobile-menu,
.mobile-nav,
.hero,
.hero__content,
.about__content,
.formats__grid,
.projects__grid,
.footer__inner,
.footer__top,
.footer__bottom,
.btn,
.card,
.modal,
.gallery,
.tabs,
.form,
.breadcrumb {
    display: -webkit-box;
    display: -webkit-flex;
    display: -ms-flexbox;
    display: flex;
}

/* ===== TRANSFORM PREFIXES ===== */
/* For animations and transitions */
@supports not (transform: translateY(0)) {
    [data-anim] {
        -webkit-transform: translateY(80px);
        -ms-transform: translateY(80px);
        transform: translateY(80px);
    }

    [data-anim].is-visible {
        -webkit-transform: translateY(0);
        -ms-transform: translateY(0);
        transform: translateY(0);
    }
}

/* ===== INSET FALLBACK ===== */
/* Safari < 14.1, older Edge */
@supports not (inset: 0) {
    .preloader,
    .modal__overlay,
    .hero__overlay,
    .card__overlay,
    .gallery__overlay {
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
    }
}

/* ===== GAP FALLBACK FOR FLEXBOX ===== */
/* Safari < 14.1, older browsers */
@supports not (gap: 1px) {
    /* Use margins instead of gap */
    .nav__list > * + *,
    .header__contacts > * + *,
    .footer__links > * + * {
        margin-left: 32px;
    }

    .formats__grid > *,
    .projects__grid > *,
    .gallery__grid > * {
        margin: 20px;
    }
}

/* ===== BACKDROP-FILTER ===== */
/* Safari, Chrome, Firefox */
.header.is-scrolled,
.mobile-menu,
.modal__content,
[class*="blur"] {
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

/* Fallback for browsers without backdrop-filter */
@supports not ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
    .header.is-scrolled,
    .mobile-menu,
    .modal__content {
        background-color: rgba(255, 255, 255, 0.95) !important;
    }
}

/* ===== OBJECT-FIT WITH PREFIXES ===== */
/* Safari, Opera, all browsers */
figure img,
.image img,
[class*="__img"],
[class*="__image"] img,
[class*="-img"],
[class*="-image"] img,
.gallery img,
[class*="gallery"] img,
[class*="card"] img,
[class*="hero"] img,
[class*="slide"] img {
    -o-object-fit: cover;
    object-fit: cover;
}

/* ===== OBJECT-FIT FALLBACK ===== */
/* IE11, older browsers */
@supports not (object-fit: cover) {
    .hero__bg img,
    .card__image img,
    .gallery__image img,
    [class*="__image"] img,
    [class*="gallery"] img,
    [class*="card"] img,
    [class*="hero"] img,
    [class*="slide"] img {
        position: absolute;
        top: 50%;
        left: 50%;
        min-width: 100%;
        min-height: 100%;
        -webkit-transform: translate(-50%, -50%);
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
    }

    /* Container needs relative positioning */
    [class*="__image"],
    [class*="gallery"],
    [class*="card"],
    [class*="hero"],
    [class*="slide"] {
        position: relative;
        overflow: hidden;
    }
}

/* ===== CSS VARIABLES FALLBACK ===== */
/* IE11 and older browsers */
@supports not (--css: variables) {
    :root {
        /* Fallback values will be applied via JS polyfill */
    }

    body {
        font-family: 'Roboto', Arial, Helvetica, sans-serif;
        color: #000;
        background: #fff;
    }

    .btn-primary {
        background: #c41e3a;
    }

    .header {
        height: 92px;
    }
}

/* ===== TRANSITION PREFIXES ===== */
/* Older Safari, Android */
*,
*::before,
*::after {
    -webkit-transition-property: inherit;
    -webkit-transition-duration: inherit;
    -webkit-transition-timing-function: inherit;
}

.btn,
.card,
.nav__link,
.gallery__item,
[data-anim] {
    -webkit-transition: all 0.3s ease;
    -moz-transition: all 0.3s ease;
    -ms-transition: all 0.3s ease;
    -o-transition: all 0.3s ease;
    transition: all 0.3s ease;
}

/* ===== ANIMATION PREFIXES ===== */
@-webkit-keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@-moz-keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@-o-keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@-webkit-keyframes slideUp {
    from {
        opacity: 0;
        -webkit-transform: translateY(30px);
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
}
@-moz-keyframes slideUp {
    from {
        opacity: 0;
        -moz-transform: translateY(30px);
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        -moz-transform: translateY(0);
        transform: translateY(0);
    }
}
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== SCROLL BEHAVIOR ===== */
/* Safari fallback handled by JS */
@supports not (scroll-behavior: smooth) {
    html {
        scroll-behavior: auto;
    }
}

/* ===== ASPECT-RATIO FALLBACK ===== */
/* Safari < 15, older browsers */
@supports not (aspect-ratio: 1) {
    .video-container,
    .embed-container {
        position: relative;
        padding-bottom: 56.25%; /* 16:9 */
        height: 0;
        overflow: hidden;
    }

    .video-container iframe,
    .video-container video,
    .embed-container iframe {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}

/* ===== GRID FALLBACK ===== */
/* IE11, older browsers */
@supports not (display: grid) {
    .formats__grid,
    .projects__grid,
    .gallery__grid,
    .news__grid {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-flex-wrap: wrap;
        -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    }

    .formats__grid > *,
    .projects__grid > *,
    .gallery__grid > *,
    .news__grid > * {
        -webkit-box-flex: 0;
        -webkit-flex: 0 0 calc(33.333% - 40px);
        -ms-flex: 0 0 calc(33.333% - 40px);
        flex: 0 0 calc(33.333% - 40px);
        margin: 20px;
    }
}

/* ===== CLIP-PATH FALLBACK ===== */
@supports not (clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%)) {
    .hero__shape,
    .decorative-shape {
        display: none;
    }
}

/* ===== POSITION STICKY FALLBACK ===== */
.sidebar,
.sticky-element {
    position: -webkit-sticky;
    position: sticky;
}

/* ===== WEBKIT SCROLLBAR (Chrome, Safari, Opera, Yandex, Edge) ===== */
::-webkit-scrollbar {
    width: 0;
    height: 0;
}

/* ===== FIREFOX SCROLLBAR ===== */
* {
    scrollbar-width: none;
}

/* ===== IE/EDGE LEGACY SCROLLBAR ===== */
* {
    -ms-overflow-style: none;
}

/* ===== FONT SMOOTHING ===== */
body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ===== TOUCH ACTION FOR MOBILE ===== */
.slider,
.gallery,
.swiper {
    -ms-touch-action: pan-y;
    touch-action: pan-y;
}

/* ===== USER SELECT ===== */
.btn,
.nav__link,
.card {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* ===== APPEARANCE RESET FOR FORMS ===== */
input,
textarea,
select,
button {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

/* ===== BOX SIZING ===== */
*,
*::before,
*::after {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

/* ===== WILL-CHANGE OPTIMIZATION ===== */
[data-anim],
.modal,
.gallery__item {
    will-change: transform, opacity;
}

/* Remove will-change after animation */
.is-visible {
    will-change: auto;
}

/* ===== RESPONSIVE FLEX PREFIXES ===== */
/* Ensure flex works on all screen sizes in all browsers */
@media (max-width: 1200px) {
    .formats__grid,
    .projects__grid,
    .gallery__grid,
    .news__grid {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-flex-wrap: wrap;
        -ms-flex-wrap: wrap;
        flex-wrap: wrap;
    }
}

@media (max-width: 768px) {
    .header__inner,
    .footer__inner,
    .nav__list {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-flex-direction: column;
        -ms-flex-direction: column;
        flex-direction: column;
    }

    /* Fix mobile menu for all browsers */
    .mobile-menu,
    .mobile-nav {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-flex-direction: column;
        -ms-flex-direction: column;
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    /* Stack everything vertically on small screens */
    .btn-group,
    .form__row,
    .card__actions {
        display: -webkit-box;
        display: -webkit-flex;
        display: -ms-flexbox;
        display: flex;
        -webkit-flex-direction: column;
        -ms-flex-direction: column;
        flex-direction: column;
        width: 100%;
    }

    .btn-group > *,
    .form__row > *,
    .card__actions > * {
        width: 100%;
        margin-left: 0;
        margin-bottom: 10px;
    }
}

/* ===== TOUCH DEVICE OPTIMIZATIONS ===== */
@media (hover: none) and (pointer: coarse) {
    /* Larger touch targets */
    .btn,
    .nav__link,
    a,
    button {
        min-height: 44px;
        min-width: 44px;
    }

    /* Disable hover effects on touch */
    .card:hover,
    .btn:hover {
        -webkit-transform: none;
        -ms-transform: none;
        transform: none;
    }
}

/* ===== PRINT STYLES ===== */
@media print {
    .header,
    .footer,
    .modal,
    .preloader,
    .btn,
    nav {
        display: none !important;
    }

    body {
        background: white !important;
        color: black !important;
    }

    a[href]::after {
        content: " (" attr(href) ")";
    }
}