/* ============================================
   ПРЕЛОАДЕР
   ============================================ */

.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    text-align: center;
    color: white;
}

.preloader-logo {
    font-size: 48px;
    font-weight: 900;
    margin-bottom: var(--space-6);
    background: linear-gradient(135deg, #FFFFFF 0%, rgba(255, 255, 255, 0.8) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: preloaderFadeIn 0.8s ease;
}

.preloader-spinner {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-4);
    position: relative;
}

.preloader-spinner::before,
.preloader-spinner::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    border: 4px solid transparent;
    border-top-color: rgba(255, 255, 255, 0.9);
    animation: preloaderSpin 1s linear infinite;
}

.preloader-spinner::before {
    width: 80px;
    height: 80px;
    border-width: 4px;
    animation-duration: 1s;
}

.preloader-spinner::after {
    width: 60px;
    height: 60px;
    top: 10px;
    left: 10px;
    border-width: 3px;
    border-top-color: rgba(255, 255, 255, 0.6);
    animation-duration: 0.8s;
    animation-direction: reverse;
}

.preloader-text {
    font-size: 16px;
    font-weight: 600;
    opacity: 0.9;
    letter-spacing: 1px;
    animation: preloaderPulse 2s ease-in-out infinite;
}

.preloader-dots {
    display: inline-flex;
    gap: 8px;
    margin-top: var(--space-3);
}

.preloader-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.8);
    animation: preloaderDotBounce 1.4s ease-in-out infinite;
}

.preloader-dot:nth-child(1) {
    animation-delay: 0s;
}

.preloader-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.preloader-dot:nth-child(3) {
    animation-delay: 0.4s;
}

/* Альтернативный стиль - круги */
.preloader-circles {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: var(--space-4);
}

.preloader-circle {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    animation: preloaderCircleScale 1.4s ease-in-out infinite;
}

.preloader-circle:nth-child(1) {
    animation-delay: 0s;
}

.preloader-circle:nth-child(2) {
    animation-delay: 0.2s;
}

.preloader-circle:nth-child(3) {
    animation-delay: 0.4s;
}

/* Анимации */
@keyframes preloaderSpin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes preloaderFadeIn {
    0% {
        opacity: 0;
        transform: translateY(-20px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes preloaderPulse {
    0%, 100% {
        opacity: 0.7;
    }
    50% {
        opacity: 1;
    }
}

@keyframes preloaderDotBounce {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1.2);
        opacity: 1;
    }
}

@keyframes preloaderCircleScale {
    0%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.3);
        opacity: 1;
    }
}

/* Темная тема для прелоадера */
body.dark-theme .preloader {
    background: linear-gradient(135deg, #1F2937 0%, #111827 100%);
}

/* Адаптивность */
@media (max-width: 768px) {
    .preloader-logo {
        font-size: 36px;
    }
    
    .preloader-spinner {
        width: 60px;
        height: 60px;
    }
    
    .preloader-spinner::before {
        width: 60px;
        height: 60px;
    }
    
    .preloader-spinner::after {
        width: 45px;
        height: 45px;
        top: 7.5px;
        left: 7.5px;
    }
    
    .preloader-text {
        font-size: 14px;
    }
}