/* Universal Infinite Scroll Styles */

/* ==========================================
   LOAD BUTTON STYLES
   ========================================== */

.uis-load-button-container {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 99999;
    width: 280px;
    box-shadow: 0 10px 40px rgba(102, 126, 234, 0.4);
    overflow: hidden;
    animation: uisSlideUp 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes uisSlideUp {
    from {
        transform: translateX(-50%) translateY(100px);
        opacity: 0;
    }
    to {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
}

.uis-load-button {
    position: relative;
    width: 100%;
    padding: 18px 30px;
    background: transparent;
    border: none;
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    z-index: 2;
    transition: all 0.3s ease;
}

.uis-load-button:hover {
    transform: translateY(-2px);
}

.uis-load-button:active {
    transform: translateY(0);
}

.button-text {
    position: relative;
    z-index: 2;
}

.button-timer {
    position: relative;
    z-index: 2;
    font-size: 14px;
    opacity: 0.8;
    animation: uisPulse 1s infinite;
}

@keyframes uisPulse {
    0%, 100% {
        opacity: 0.8;
    }
    50% {
        opacity: 0.4;
    }
}

.button-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 3px;
    background: rgba(255, 255, 255, 0.5);
    z-index: 1;
}

/* ==========================================
   LOADING OVERLAY STYLES
   ========================================== */

.uis-loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 100000;
    animation: uisFadeIn 0.4s ease;
}

@keyframes uisFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.uis-loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid #f3f3f3;
    border-radius: 50%;
    animation: uisSpin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes uisSpin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.uis-loading-overlay p {
    font-family: inherit;
    font-size: 18px;
    font-weight: 500;
    margin: 0;
}

/* ==========================================
   END MESSAGE STYLES
   ========================================== */

.uis-end-message {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 99999;
    padding: 40px 50px;
    box-shadow: 0 10px 50px rgba(0, 0, 0, 0.15);
    text-align: center;
    max-width: 400px;
    animation: uisBounceIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes uisBounceIn {
    0% {
        transform: translateX(-50%) scale(0.3);
        opacity: 0;
    }
    50% {
        transform: translateX(-50%) scale(1.05);
    }
    70% {
        transform: translateX(-50%) scale(0.9);
    }
    100% {
        transform: translateX(-50%) scale(1);
        opacity: 1;
    }
}

.uis-end-message .end-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: #ffffff;
    margin: 0 auto 20px;
    animation: uisCheckmark 0.5s ease 0.3s both;
}

@keyframes uisCheckmark {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

.uis-end-message h3 {
    font-family: inherit;
    font-size: 24px;
    font-weight: 700;
    margin: 0 0 10px 0;
}

.uis-end-message p {
    font-family: inherit;
    font-size: 16px;
    margin: 0 0 25px 0;
}

.uis-back-home-btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 25px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.uis-back-home-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    text-decoration: none;
}

.uis-back-home-btn:active {
    transform: translateY(0);
}

/* ==========================================
   RESPONSIVE STYLES
   ========================================== */

@media (max-width: 768px) {
    .uis-load-button-container {
        width: 240px;
        bottom: 20px;
    }
    
    .uis-load-button {
        padding: 14px 25px;
        font-size: 14px;
    }
    
    .button-timer {
        font-size: 12px;
    }
    
    .uis-end-message {
        max-width: 320px;
        padding: 30px 30px;
        bottom: 20px;
    }
    
    .uis-end-message .end-icon {
        width: 50px;
        height: 50px;
        font-size: 28px;
    }
    
    .uis-end-message h3 {
        font-size: 20px;
    }
    
    .uis-end-message p {
        font-size: 14px;
    }
    
    .uis-back-home-btn {
        padding: 10px 25px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .uis-load-button-container {
        width: calc(100% - 40px);
        max-width: 280px;
    }
    
    .uis-end-message {
        width: calc(100% - 40px);
        max-width: 320px;
        padding: 25px 20px;
    }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */

/* Focus styles for accessibility */
.uis-load-button:focus {
    outline: 3px solid rgba(102, 126, 234, 0.5);
    outline-offset: 2px;
}

.uis-back-home-btn:focus {
    outline: 3px solid rgba(102, 126, 234, 0.5);
    outline-offset: 2px;
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    .uis-load-button-container,
    .uis-loading-overlay,
    .uis-end-message,
    .uis-loading-spinner,
    .button-timer,
    .button-progress {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .uis-loading-overlay {
        background: rgba(0, 0, 0, 0.95);
    }
    
    .uis-loading-spinner {
        border-color: #333;
    }
    
    .uis-end-message {
        background: #1a1a1a;
        box-shadow: 0 10px 50px rgba(0, 0, 0, 0.5);
    }
}

/* ==========================================
   PERFORMANCE OPTIMIZATIONS
   ========================================== */

/* Hardware acceleration */
.uis-load-button-container,
.uis-loading-overlay,
.uis-end-message,
.uis-loading-spinner {
    will-change: transform, opacity;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}