/* ============================================
   СИСТЕМА ЗАГРУЗКИ И СКЕЛЕТОНЫ
   ============================================ */

/* Базовый контейнер загрузки */
.loading-container {
    position: relative;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Скелетон для карточек товаров */
.product-skeleton {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    animation: fadeIn 0.3s ease;
}

.skeleton-image {
    width: 100%;
    height: 240px;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.skeleton-content {
    padding: 24px;
}

.skeleton-line {
    height: 12px;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    border-radius: 6px;
    margin-bottom: 12px;
    animation: shimmer 1.5s infinite;
}

.skeleton-line.short {
    width: 60%;
}

.skeleton-line.medium {
    width: 80%;
}

.skeleton-line.long {
    width: 100%;
}

.skeleton-button {
    height: 44px;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    border-radius: var(--border-radius-md);
    margin-top: 16px;
    animation: shimmer 1.5s infinite;
}

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

/* Скелетон для deals */
.deal-skeleton {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.deal-skeleton .skeleton-image {
    height: 240px;
}

/* Индикатор загрузки с текстом */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100;
    backdrop-filter: blur(4px);
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(121, 25, 27, 0.1);
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
    margin-bottom: 16px;
}

.loading-text {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    text-align: center;
    animation: pulse 1.5s ease-in-out infinite;
}

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

/* Скелетон для способов оплаты */
.payment-skeleton {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 32px 0;
}

.payment-option-skeleton {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
}

.payment-option-skeleton .skeleton-circle {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(
        90deg,
        #f0f0f0 0%,
        #e0e0e0 20%,
        #f0f0f0 40%,
        #f0f0f0 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

.payment-option-skeleton .skeleton-line {
    flex: 1;
}

/* Скелетон для профиля */
.profile-skeleton {
    background: var(--gradient-primary);
    padding: 40px;
    border-radius: var(--border-radius-xl);
    margin-bottom: 40px;
    box-shadow: var(--shadow-xl);
}

.profile-skeleton .skeleton-line,
.profile-skeleton .skeleton-button {
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.1) 0%,
        rgba(255, 255, 255, 0.2) 20%,
        rgba(255, 255, 255, 0.1) 40%,
        rgba(255, 255, 255, 0.1) 100%
    );
    background-size: 200% 100%;
}

/* Скелетон для истории заказов */
.order-skeleton {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    padding: 28px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* Скрытие элементов при загрузке */
.hidden-while-loading {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.loaded {
    opacity: 1;
    pointer-events: auto;
}

/* Скелетон для отзывов */
.reviews-skeleton {
    background: var(--white);
    padding: 32px;
    border-radius: var(--border-radius-xl);
    margin-bottom: 32px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* Индикатор загрузки для кнопок */
.btn-loading {
    position: relative;
    pointer-events: none;
    color: transparent !important;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid var(--white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Скелетон для deals секции */
.deals-section-skeleton {
    background: var(--white);
    border-radius: var(--border-radius-xl);
    padding: 48px;
    margin-bottom: 48px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

/* Плавное появление элементов после загрузки */
.fade-in-element {
    animation: fadeInUp 0.5s ease forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Состояние ошибки */
.error-state {
    text-align: center;
    padding: 60px 20px;
    background: var(--background);
    border-radius: var(--border-radius-lg);
    border: 2px dashed var(--danger);
}

.error-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.error-state-title {
    font-size: 24px;
    color: var(--danger);
    margin-bottom: 12px;
    font-weight: 700;
}

.error-state-message {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 24px;
}

/* Пустое состояние */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    background: var(--background);
    border-radius: var(--border-radius-lg);
}

.empty-state-icon {
    font-size: 72px;
    margin-bottom: 24px;
    opacity: 0.5;
}

.empty-state-title {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 12px;
    font-weight: 700;
}

.empty-state-message {
    color: var(--text-secondary);
    font-size: 15px;
}

/* Адаптивность для мобильных */
@media (max-width: 768px) {
    .skeleton-image {
        height: 200px;
    }
    
    .deal-skeleton .skeleton-image {
        height: 200px;
    }
    
    .loading-spinner {
        width: 40px;
        height: 40px;
    }
    
    .loading-text {
        font-size: 13px;
    }
}