/* --- Base Layout & Canvas Wrapper --- */
body, html {
    margin: 0;
    padding: 0;
    background: #000;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    font-family: 'Quicksand', sans-serif;
}

#canvas-wrapper {
    position: relative;
    max-width: 97vw;
    max-height: 97vh;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.7);
}

#rippleCanvas {
    display: block;
    max-width: 100%;
    max-height: 100%;
}

/* --- Title --- */
.main-title {
    position: absolute;
    top: 6%;
    left: 50%;
    transform: translateX(-50%);
    margin: 0;
    font-weight: 300;
    font-size: 3.5vw;
    letter-spacing: 1px;
    z-index: 20;
    pointer-events: none;
    color: #ffffff;
    filter: drop-shadow(0 0 2px #fff)
            drop-shadow(0 0 10px #fff)
            drop-shadow(0 0 20px rgba(255, 255, 255, 0.8));
    transition: opacity 1.2s ease-in-out,
                visibility 1.2s ease-in-out;
}

/* --- Interactive Navigation Items --- */
.nav-item {
    position: absolute;
    z-index: 20;
    white-space: nowrap;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    pointer-events: none;
    color: #ffffff;
    font-weight: 400;
    font-size: 2vw;
    filter: drop-shadow(0 0 2px #fff)
            drop-shadow(0 0 10px #fff)
            drop-shadow(0 0 20px rgba(255, 255, 255, 0.8));

    transition: color 0.3s ease,
                filter 0.3s ease,
                transform 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                opacity 1.2s ease-in-out,
                visibility 1.2s ease-in-out;
}

.nav-item a {
    pointer-events: auto;
    cursor: pointer;
    display: inline-block;
    padding: 12px 18px;
    text-decoration: none;
    color: inherit;
}

.nav-item:hover {
    color: #FF0000;
    opacity: 1;
    filter: drop-shadow(0 8px 15px rgba(0, 0, 0, 0.6));
}

/* --- Quadrant Positioning --- */
#btn-download  { top: 32%; left: 30%; transform: translate(-50%, -50%); }
#btn-demo      { top: 32%; left: 70%; transform: translate(-50%, -50%); }
#btn-community { top: 76%; left: 30%; transform: translate(-50%, -50%); }
#btn-about     { top: 76%; left: 70%; transform: translate(-50%, -50%); }

#btn-download:hover  { transform: translate(-50%, -50%) scale(1.18); }
#btn-demo:hover      { transform: translate(-50%, -50%) scale(1.18); }
#btn-community:hover { transform: translate(-50%, -50%) scale(1.18); }
#btn-about:hover     { transform: translate(-50%, -50%) scale(1.18); }

/* --- Footer --- */
.footer-container {
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 30;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    color: #888;
    text-shadow: 0 0 12px rgba(255, 255, 255, 0.9);
    transition: opacity 1.2s ease-in-out,
                visibility 1.2s ease-in-out;
}

/* --- Center Disc Container --- */
#portal-wrapper {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    max-width: 90vw;
    height: auto;
    z-index: 25;
    pointer-events: auto;
    cursor: pointer;

    margin-left: -300px;
    margin-top: -300px;

    transform: scale(1);
    transform-origin: center center;
    transition: transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Scale down when state is active */
.conduit-active #portal-wrapper {
    transform: scale(0.4);
}

/* --- Animation Layers --- */
#portal-pulse-container {
    width: 100%;
    height: 100%;
    display: block;
    transform-origin: center center;
    animation: portalPulse 5s ease-in-out infinite;
}

#portal-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    transform-origin: center center;
    animation: portalSpin 50s linear infinite;
}

@keyframes portalSpin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes portalPulse {
    0%, 100% {
        transform: scale(1.0);
        filter: drop-shadow(0 0 15px rgba(255, 255, 255, 0.2));
    }

    50% {
        transform: scale(1.05);
        filter: drop-shadow(0 0 35px rgba(255, 255, 255, 0.6));
    }
}

/* --- UI State --- */

/* Landing: UI hidden */
.main-title,
.nav-item,
.footer-container {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

/* Conduit view: UI revealed */
#canvas-wrapper.conduit-active .main-title,
#canvas-wrapper.conduit-active .nav-item,
#canvas-wrapper.conduit-active .footer-container {
    opacity: 0.8;
    visibility: visible;
    pointer-events: auto;
}

/* ---------------------------------------- */
/* --- About Overlay --- */

.overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;

    background: rgba(0, 0, 0, 0.4);

    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease;
}

.overlay.visible {
    opacity: 1;
    visibility: visible;
}

.about-panel {
    width: 800px;
    height: 600px;
    padding: 40px;
    box-sizing: border-box;
    border-radius: 16px;
    overflow: auto;

    background: rgba(255, 240, 240, 0.9);
    color: darkred;
    text-shadow: 0 0 6px rgba(0, 0, 0, 0.1);
    font-size: 1rem;
    line-height: 1.6;

    box-shadow: 0 0 30px rgba(0, 0, 0, 0.4);
}

.overlay-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.close-btn {
    display: inline-block;
    float: right;
    font-size: 1.5rem;
    line-height: 1;
    color: darkred;
    cursor: pointer;
    text-shadow: 0 0 6px rgba(255, 0, 0, 0.5);
    transition: transform 0.25s ease, color 0.25s ease, text-shadow 0.25s ease;
}

.close-btn:hover {
    transform: scale(1.3);
    color: red;
    text-shadow: 0 0 12px rgba(0, 0, 0, 0.9);
}

.about-panel h2 {
    margin-top: 10px;
    font-weight: 400;
}

.about-logo {
    text-align: center;
    margin-top: 30px;
}

.about-logo img {
    width: 50px;
    height: 50px;
}