/* =========================================
   9. INTRO ANIMATION (SOLAR PANEL ASSEMBLY)
   ========================================= */
.intro-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--color-dark);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px;
    transition: opacity 1s ease, visibility 1s ease;
}

.intro-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.panel-container {
    width: 300px;
    height: 500px;
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(60deg) rotateZ(-30deg) rotateY(10deg);
    animation: floatingContainer 4s ease-in-out infinite;
}

.solar-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    transition: transform 1.5s cubic-bezier(0.19, 1, 0.22, 1);
}

/* Layer 1: Backsheet (White/Back) */
.layer-back {
    background: #e0e0e0;
    transform: translateZ(-200px);
    border: 1px solid #999;
}

/* Layer 2: Cells (Dark Blue/Black with Grid) */
.layer-cells {
    background:
        linear-gradient(90deg, transparent 95%, #888 95%),
        linear-gradient(transparent 95%, #888 95%),
        radial-gradient(circle, #001a33, #000);
    background-size: 50px 50px, 50px 50px, 100% 100%;
    transform: translateZ(-100px);
    box-shadow: 0 0 15px rgba(0, 50, 255, 0.2);
}

/* Layer 3: Encapsulant (EVA - Slight transparency) */
.layer-eva {
    background: rgba(255, 255, 255, 0.1);
    transform: translateZ(0px);
}

/* Layer 4: Glass (Reflective) */
.layer-glass {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0.05) 50%, rgba(255, 255, 255, 0) 100%);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(1px);
    transform: translateZ(100px);
    overflow: hidden;
}

.layer-glass::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(transparent, rgba(255, 255, 255, 0.8), transparent);
    transform: rotate(45deg) translateY(-100%);
    animation: shine 3s infinite;
}

/* Layer 5: Frame (Aluminum) */
.layer-frame {
    border: 10px solid #d0d0d0;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.5);
    transform: translateZ(200px);
    background: transparent;
    pointer-events: none;
    /* Let clicks pass through */
}

/* Assembled State */
.panel-container.assembled .solar-layer {
    transform: translateZ(0);
}

/* Final Animation: Rotate to face user */
.panel-container.assembled.facing {
    transform: rotateX(0) rotateY(0) rotateZ(0) scale(1.2);
    transition: transform 1s ease;
}

@keyframes shine {
    0% {
        transform: rotate(45deg) translateY(-100%);
    }

    100% {
        transform: rotate(45deg) translateY(200%);
    }
}

@keyframes floatingContainer {

    0%,
    100% {
        transform: rotateX(60deg) rotateZ(-30deg) rotateY(10deg) translateY(0);
    }

    50% {
        transform: rotateX(60deg) rotateZ(-30deg) rotateY(10deg) translateY(-20px);
    }
}

/* Text under animation */
.intro-text {
    position: absolute;
    bottom: 10%;
    text-align: center;
    width: 100%;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease, transform 1s ease;
    font-size: 1.2rem;
    color: var(--color-primary);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.intro-text.visible {
    opacity: 1;
    transform: translateY(0);
}