/* ========================================
   PRELOADER STYLES - 33 STUDIO
   Using Bootstrap 5 utilities for layout
======================================== */

/* Hide scrollbar when preloader is active */
body:has(#preloader:not(.fade-out)) {
    overflow: hidden;
}

#preloader {
    z-index: 20000;
    background-color: #000000 !important;
    transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

#preloader.fade-out {
    opacity: 0;
    visibility: hidden;
}

.studio-logo {
    width: 250px;
    height: 250px;
    fill: none;
    stroke: #FFFFFF;
    stroke-width: 0.15;
    stroke-linecap: round;
    stroke-linejoin: round;
}

/* Upper half - draws LEFT to RIGHT */
.upper-half {
    stroke-dasharray: 60;
    stroke-dashoffset: 60;
    fill: transparent;
    stroke: #FFFFFF;
    animation: drawLoop 2s ease-in-out infinite;
}

/* Lower half - draws RIGHT to LEFT (mirrored) */
.lower-half {
    transform-origin: center;
    transform-box: fill-box;
    transform: scaleX(-1);
    stroke-dasharray: 60;
    stroke-dashoffset: 60;
    fill: transparent;
    stroke: #FFFFFF;
    animation: drawLoop 2s ease-in-out infinite;
}

/* State when page is fully loaded */
#preloader.is-loaded .upper-half,
#preloader.is-loaded .lower-half {
    animation: fillFadeIn 0.8s ease-out forwards;
}

@keyframes drawLoop {
    0% {
        stroke-dashoffset: 60;
    }
    50% {
        stroke-dashoffset: 0;
    }
    100% {
        stroke-dashoffset: 60;
    }
}

.loading-text {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    font-family: 'Segoe UI', 'Roboto', 'Arial', sans-serif;
    font-size: 0.75rem;
    font-weight: 300;
    color: #ffffff;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.8;
}

/* 1. Vẽ Xuôi (Offset dương về 0) */
@keyframes drawForward {
    to {
        stroke-dashoffset: 0;
    }
}

/* 2. Vẽ Ngược (Offset âm về 0) */
@keyframes drawReverse {
    to {
        stroke-dashoffset: 0;
    }
}

/* 3. Hiện màu nền sau khi vẽ xong */
@keyframes fillFadeIn {
    to {
        fill: #FFFFFF;
        stroke: transparent;
    }
}

/* Responsive adjustments using Bootstrap breakpoints */
@media (max-width: 768px) {
    .studio-logo {
        width: 180px;
        height: 180px;
    }
}