/**
 * VisionLoader - Unified Loading Animation System
 * Beautiful, mobile-responsive loading overlay with sliding counter
 */

/* Main overlay container - ALWAYS display:flex to avoid iOS Safari rendering bug */
#vision-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, rgba(10, 15, 30, 0.97) 0%, rgba(15, 23, 42, 0.97) 100%);
    z-index: 999999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease-in-out;
}

#vision-loader.active {
    opacity: 1;
    pointer-events: auto;
}

#vision-loader.hiding {
    opacity: 0;
    pointer-events: none;
}

/* Circular progress wrapper */
.vision-loader-circle-wrapper {
    position: relative;
    width: 120px;
    height: 120px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Circular progress background */
.vision-loader-circle-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 3px solid rgba(255, 255, 255, 0.15);
    box-sizing: border-box;
}

/* Rotating ring */
.vision-loader-circle-track {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 5px solid transparent;
    border-top-color: #3b82f6;
    border-right-color: #06b6d4;
    border-bottom-color: #0ea5e9;
    box-sizing: border-box;
    animation: vision-spin 1.2s linear infinite;
}

/* Center content */
.vision-loader-center {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

/* Counter - fixed height window showing one number at a time */
.vision-loader-counter {
    width: 50px;
    height: 2.2rem;
    overflow: hidden;
    display: flex;
    justify-content: center;
}

/* Inner sliding column containing all numbers */
.vision-loader-counter-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Each number in the column */
.vision-loader-counter-inner .num {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: #3b82f6;
    text-align: center;
    line-height: 2.2rem;
    height: 2.2rem;
    flex-shrink: 0;
}

/* Slide animation when loader is active - moves through 7 numbers */
#vision-loader.active .vision-loader-counter-inner {
    animation: vision-slide 4s ease-out forwards;
}

/* Slide through numbers: 7 numbers = 6 steps, each step moves up by 2.2rem */
@keyframes vision-slide {
    0% { transform: translateY(0); }
    10% { transform: translateY(-2.2rem); }
    25% { transform: translateY(-4.4rem); }
    40% { transform: translateY(-6.6rem); }
    55% { transform: translateY(-8.8rem); }
    75% { transform: translateY(-11rem); }
    100% { transform: translateY(-13.2rem); }
}

@-webkit-keyframes vision-slide {
    0% { -webkit-transform: translateY(0); }
    10% { -webkit-transform: translateY(-2.2rem); }
    25% { -webkit-transform: translateY(-4.4rem); }
    40% { -webkit-transform: translateY(-6.6rem); }
    55% { -webkit-transform: translateY(-8.8rem); }
    75% { -webkit-transform: translateY(-11rem); }
    100% { -webkit-transform: translateY(-13.2rem); }
}

.vision-loader-percent-label {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 0.75rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 2px;
}

/* Message text */
.vision-loader-message {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 1.1rem;
    font-weight: 500;
    color: #ffffff;
    text-align: center;
    max-width: 280px;
    line-height: 1.4;
    padding: 0 20px;
}

/* Animated dots */
.vision-loader-dots {
    display: inline-flex;
    margin-left: 6px;
    gap: 4px;
    vertical-align: middle;
}

.vision-loader-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: #3b82f6;
    animation: vision-bounce 1.4s infinite ease-in-out;
}

.vision-loader-dot:nth-child(1) { animation-delay: 0s; }
.vision-loader-dot:nth-child(2) { animation-delay: 0.2s; }
.vision-loader-dot:nth-child(3) { animation-delay: 0.4s; }

/* Success state */
#vision-loader.success .vision-loader-circle-track {
    border-color: #22c55e;
    animation: none;
    -webkit-animation: none;
}

#vision-loader.success .vision-loader-counter-inner .num {
    color: #22c55e;
}

#vision-loader.success .vision-loader-dot {
    background-color: #22c55e;
}

/* Animations */
@keyframes vision-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes vision-bounce {
    0%, 80%, 100% { opacity: 0.4; transform: scale(0.8); }
    40% { opacity: 1; transform: scale(1.3); }
}

/* Mobile responsiveness */
@media screen and (max-width: 768px) {
    .vision-loader-circle-wrapper {
        width: 100px;
        height: 100px;
        margin-bottom: 20px;
    }
    
    .vision-loader-counter {
        height: 1.8rem;
    }
    
    .vision-loader-counter-inner .num {
        font-size: 1.6rem;
        line-height: 1.8rem;
        height: 1.8rem;
    }
    
    /* Adjust slide distances for mobile */
    #vision-loader.active .vision-loader-counter-inner {
        animation: vision-slide-mobile 4s ease-out forwards;
    }
    
    .vision-loader-percent-label {
        font-size: 0.65rem;
    }
    
    .vision-loader-message {
        font-size: 1rem;
        max-width: 240px;
    }
    
    .vision-loader-dot {
        width: 5px;
        height: 5px;
    }
}

@keyframes vision-slide-mobile {
    0% { transform: translateY(0); }
    10% { transform: translateY(-1.8rem); }
    25% { transform: translateY(-3.6rem); }
    40% { transform: translateY(-5.4rem); }
    55% { transform: translateY(-7.2rem); }
    75% { transform: translateY(-9rem); }
    100% { transform: translateY(-10.8rem); }
}

@media screen and (max-width: 380px) {
    .vision-loader-circle-wrapper {
        width: 80px;
        height: 80px;
        margin-bottom: 16px;
    }
    
    .vision-loader-counter {
        height: 1.5rem;
    }
    
    .vision-loader-counter-inner .num {
        font-size: 1.4rem;
        line-height: 1.5rem;
        height: 1.5rem;
    }
    
    #vision-loader.active .vision-loader-counter-inner {
        animation: vision-slide-small 4s ease-out forwards;
        -webkit-animation: vision-slide-small 4s ease-out forwards;
    }
    
    .vision-loader-message {
        font-size: 0.9rem;
        max-width: 200px;
    }
}

@keyframes vision-slide-small {
    0% { transform: translateY(0); }
    10% { transform: translateY(-1.5rem); }
    25% { transform: translateY(-3rem); }
    40% { transform: translateY(-4.5rem); }
    55% { transform: translateY(-6rem); }
    75% { transform: translateY(-7.5rem); }
    100% { transform: translateY(-9rem); }
}

/* Prevent body scroll when loader is active */
body.vision-loader-active {
    overflow: hidden !important;
    position: fixed;
    width: 100%;
    height: 100%;
}