/**
 * Lazy Loading CSS
 * Schöne sanfte Effekte für Bildladevorgang
 *
 * @version 1.0
 * @date 2025-10-20
 */

/* =================================================================
   Lazy Image Basis-Styles
   ================================================================= */

.lazy-image,
.lazy-bg {
    position: relative;
    opacity: 0;
    transition: opacity 0.6s ease-in-out;
}

/* Kritische Bilder (Logo, etc.) sofort sichtbar machen für korrekte Layout-Berechnung */
.lazy-image.logo-navbar {
    opacity: 1 !important;
}

/* Lade-State */
.lazy-image:not(.loaded),
.lazy-bg:not(.loaded) {
    background-color: #f0f0f0;
    min-height: 100px;
}

/* Geladen */
.lazy-image.loaded,
.lazy-bg.loaded {
    opacity: 1;
}

/* Fehlgeschlagen */
.lazy-image.error {
    opacity: 0.3;
    background-color: #ffebee;
}

/* =================================================================
   Loading Spinner
   ================================================================= */

/* Container für Spinner */
.lazy-image:not(.loaded)::before,
.lazy-bg:not(.loaded)::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top-color: #1976d2;
    border-radius: 50%;
    animation: lazy-spinner 0.8s linear infinite;
    z-index: 10;
}

/* Spinner Animation */
@keyframes lazy-spinner {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Alternative: Pulsierender Effekt */
.lazy-image.pulse:not(.loaded)::after,
.lazy-bg.pulse:not(.loaded)::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 60px;
    height: 60px;
    margin: -30px 0 0 -30px;
    border-radius: 50%;
    background-color: rgba(25, 118, 210, 0.2);
    animation: lazy-pulse 1.5s ease-in-out infinite;
    z-index: 9;
}

@keyframes lazy-pulse {
    0%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.8;
    }
}

/* =================================================================
   Skeleton Loading (Alternative)
   ================================================================= */

.lazy-image.skeleton:not(.loaded),
.lazy-bg.skeleton:not(.loaded) {
    background: linear-gradient(
        90deg,
        #f0f0f0 25%,
        #e0e0e0 50%,
        #f0f0f0 75%
    );
    background-size: 200% 100%;
    animation: lazy-skeleton 1.5s ease-in-out infinite;
}

.lazy-image.skeleton:not(.loaded)::before {
    display: none; /* Verstecke Spinner bei Skeleton */
}

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

/* =================================================================
   Blur-Up Effekt (wie Medium.com)
   ================================================================= */

.lazy-image.blur-up:not(.loaded) {
    filter: blur(10px);
    transform: scale(1.05);
}

.lazy-image.blur-up.loaded {
    filter: blur(0);
    transform: scale(1);
    transition: filter 0.5s ease-out, transform 0.5s ease-out, opacity 0.5s ease-out;
}

/* =================================================================
   Background Images mit Lazy Loading
   ================================================================= */

.lazy-bg {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.lazy-bg:not(.loaded) {
    background-image: none !important;
}

/* =================================================================
   Responsive Anpassungen
   ================================================================= */

/* Kleinere Spinner auf Mobile */
@media (max-width: 576px) {
    .lazy-image:not(.loaded)::before,
    .lazy-bg:not(.loaded)::before {
        width: 30px;
        height: 30px;
        margin: -15px 0 0 -15px;
        border-width: 2px;
    }

    .lazy-image.pulse:not(.loaded)::after,
    .lazy-bg.pulse:not(.loaded)::after {
        width: 45px;
        height: 45px;
        margin: -22.5px 0 0 -22.5px;
    }
}

/* =================================================================
   Picture Element Support
   ================================================================= */

picture {
    display: block;
    position: relative;
}

picture .lazy-image {
    width: 100%;
    height: auto;
    display: block;
}

/* =================================================================
   Zusätzliche Utility Classes
   ================================================================= */

/* Fade-In Varianten */
.lazy-fade-fast.loaded {
    transition: opacity 0.3s ease-in-out;
}

.lazy-fade-slow.loaded {
    transition: opacity 1s ease-in-out;
}

/* Slide-In von unten */
.lazy-slide-up {
    transform: translateY(20px);
}

.lazy-slide-up.loaded {
    transform: translateY(0);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

/* Scale-In Effekt */
.lazy-scale {
    transform: scale(0.95);
}

.lazy-scale.loaded {
    transform: scale(1);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

/* =================================================================
   Dark Mode Support
   ================================================================= */

@media (prefers-color-scheme: dark) {
    .lazy-image:not(.loaded),
    .lazy-bg:not(.loaded) {
        background-color: #2a2a2a;
    }

    .lazy-image:not(.loaded)::before,
    .lazy-bg:not(.loaded)::before {
        border-color: rgba(255, 255, 255, 0.1);
        border-top-color: #64b5f6;
    }

    .lazy-image.skeleton:not(.loaded),
    .lazy-bg.skeleton:not(.loaded) {
        background: linear-gradient(
            90deg,
            #2a2a2a 25%,
            #3a3a3a 50%,
            #2a2a2a 75%
        );
        background-size: 200% 100%;
    }

    .lazy-image.error {
        background-color: #5d1f1f;
    }
}

/* =================================================================
   Accessibility
   ================================================================= */

/* Reduzierte Animation für Nutzer mit Motion-Sensitivity */
@media (prefers-reduced-motion: reduce) {
    .lazy-image,
    .lazy-bg,
    .lazy-image.loaded,
    .lazy-bg.loaded {
        transition: none !important;
        animation: none !important;
    }

    .lazy-image:not(.loaded)::before,
    .lazy-bg:not(.loaded)::before,
    .lazy-image.pulse:not(.loaded)::after,
    .lazy-bg.pulse:not(.loaded)::after {
        animation: none !important;
    }
}

/* Focus-Styles für Keyboard-Navigation */
.lazy-image:focus,
.lazy-bg:focus {
    outline: 2px solid #1976d2;
    outline-offset: 2px;
}