* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #ffffff;
    --accent-color: #00ffff;
    --bg-color: #0a0a0a;
    --transition-speed: 0.5s;
    --blur-amount: 10px;
    --slide-duration: 0.5s;
    --heading-shadow: 0 2px 10px rgba(0, 255, 255, 0.3);
    --btn-shadow: 0 0 15px rgba(0, 255, 255, 0.15);
}

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: -webkit-fill-available; /* Для iOS Safari */
}

main {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.slider {
    position: relative;
    display: flex;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    overflow: hidden;
}

.item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: transform var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1),
                opacity var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1),
                filter var(--transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform, opacity, filter;
    background-size: contain !important;
    background-position: center !important;
}

.item.sliding {
    z-index: 1;
}

.item:first-child {
    opacity: 1;
    position: relative;
}

.item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-position: center !important;
    background-repeat: no-repeat !important;
    transition: all var(--slide-duration) cubic-bezier(0.4, 0, 0.2, 1);
}

/* Для обычных изображений */
.item:not(.smallPadding)::before {
    background-size: cover !important;
}

/* Для изображений с маленьким отступом */
.item.smallPadding::before {
    background-size: contain !important;
    margin: 2rem;
}

.item::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        180deg,
        rgba(10,10,10,0.8) 0%,
        rgba(10,10,10,0) 20%,
        rgba(10,10,10,0) 80%,
        rgba(10,10,10,0.8) 100%
    );
    pointer-events: none;
}

.mainHeading {
    position: absolute;
    top: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--primary-color);
    text-shadow: var(--heading-shadow);
    z-index: 10;
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    text-align: center;
    padding: 0 1rem;
    width: 100%;
    max-width: 1200px;
    letter-spacing: 1px;
    font-weight: 400;
    opacity: 0.9;
    transition: opacity 0.3s ease;
}

.mainHeading:hover {
    opacity: 1;
}

.nav {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    user-select: none;
    display: flex;
    gap: 0.6rem;
    padding: 0.4rem;
    border-radius: 16px;
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.08);
    transform-origin: center;
    transition: all 0.3s ease;
}

.nav .btn {
    background-color: rgba(255,255,255,0.08);
    color: var(--accent-color);
    border: 1px solid rgba(0,255,255,0.15);
    padding: 0.5rem;
    border-radius: 50%;
    cursor: pointer;
    backdrop-filter: blur(5px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--btn-shadow);
    min-width: 1.8rem;
    min-height: 1.8rem;
    opacity: 0.8;
}

.nav .btn:hover {
    background-color: rgba(0,255,255,0.15);
    transform: scale(1.1);
    border-color: var(--accent-color);
    box-shadow: 0 0 20px rgba(0,255,255,0.3);
    opacity: 1;
}

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

/* Стили для изображений с маленьким отступом */
.smallPadding {
    padding: min(2rem, 5vw);
}

/* Адаптивность */
@media (max-width: 768px) {
    .mainHeading {
        top: max(1rem, 3vh);
        font-size: clamp(1.1rem, 4vw, 1.6rem);
        padding: 0 max(1rem, 3vw);
    }
    
    .nav {
        bottom: max(1.5rem, 4vh);
        gap: max(1rem, 3vw);
        padding: max(0.6rem, 1.5vw);
    }
    
    .nav .btn {
        padding: max(0.8rem, 2vw);
        font-size: max(1.1rem, 3vw);
        min-width: 2.5rem;
        min-height: 2.5rem;
        border-width: 2px;
    }

    .item {
        background-size: contain !important;
    }
}

@media (max-width: 480px) {
    .mainHeading {
        top: max(0.8rem, 2vh);
        font-size: clamp(1rem, 4vw, 1.4rem);
        padding: 0 max(0.8rem, 2vw);
    }

    .nav {
        bottom: max(1rem, 3vh);
        gap: max(0.8rem, 2vw);
        padding: max(0.5rem, 1.5vw);
    }
    
    .nav .btn {
        padding: max(0.6rem, 1.5vw);
        font-size: max(1rem, 2.5vw);
        min-width: 2.2rem;
        min-height: 2.2rem;
    }
    
    .smallPadding {
        padding: min(1rem, 3vw);
    }
}

/* Фиксы для iOS */
@supports (-webkit-touch-callout: none) {
    body {
        height: -webkit-fill-available;
    }

    .item {
        height: -webkit-fill-available;
    }
}

/* Ландшафтная ориентация на мобильных */
@media (max-height: 480px) and (orientation: landscape) {
    .mainHeading {
        top: max(0.3rem, 1vh);
        font-size: clamp(0.9rem, 3vw, 1.2rem);
    }

    .nav {
        bottom: max(0.3rem, 1vh);
        gap: max(0.6rem, 1.5vw);
        padding: max(0.4rem, 1vw);
    }
    
    .nav .btn {
        padding: max(0.5rem, 1.5vw);
        font-size: max(0.9rem, 2.5vw);
        min-width: 2rem;
        min-height: 2rem;
    }
    
    .smallPadding {
        padding: min(0.5rem, 2vw);
    }
}