/* Card expand overlay — transform + opacity only (GPU-friendly) */
body.transition-active #main-menu,
body.transition-active #starfield,
body.transition-active .vignette {
    visibility: hidden;
    pointer-events: none;
}
body.transition-active #main-menu {
    opacity: 0;
    transition: none !important;
    transform: none !important;
    filter: none !important;
}

.card-load-transition {
    --expand-dur: 620ms;
    --expand-ease: cubic-bezier(0.22, 1, 0.36, 1);
    position: fixed;
    z-index: 96;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    border-radius: var(--load-br-x, 16px) / var(--load-br-y, 16px);
    overflow: hidden;
    opacity: 1;
    pointer-events: none;
    transform-origin: top left;
    transform: translate3d(var(--load-x, 0px), var(--load-y, 0px), 0) scale3d(var(--load-sx, 1), var(--load-sy, 1), 1);
    transition:
        transform var(--expand-dur) var(--expand-ease),
        opacity 280ms var(--expand-ease);
    box-shadow: 0 24px 56px rgba(0,0,0,0.38), 0 0 40px rgba(99,102,241,0.2);
    will-change: transform, opacity;
    contain: strict;
    backface-visibility: hidden;
}

.card-load-transition.expanding {
    transform: translate3d(0, 0, 0) scale3d(1, 1, 1);
    border-radius: 0;
}

/* Static light wash (no spin during expand — keeps compositing smooth) */
.card-load-transition::before {
    content: '';
    position: absolute;
    inset: -20%;
    background:
        radial-gradient(circle at 30% 28%, rgba(255, 255, 255, 0.1), transparent 48%),
        radial-gradient(circle at 72% 68%, rgba(var(--c-rgb, 56, 189, 248), 0.14), transparent 55%);
    opacity: 0.72;
    pointer-events: none;
}
.card-load-transition.expanding::before {
    opacity: 0.55;
    transition: opacity 400ms var(--expand-ease);
}

/* Beautiful organic full-screen cinematic overlay that blooms in */
.card-load-transition::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 50% 50%, transparent 20%, rgba(2, 3, 10, 0.94) 80%),
        linear-gradient(180deg, rgba(2, 3, 10, 0.3) 0%, rgba(2, 3, 10, 0.96) 100%);
    opacity: 0;
    transition: opacity var(--expand-dur) var(--expand-ease);
    pointer-events: none;
}
.card-load-transition.expanding::after {
    opacity: 0.85;
}

.card-load-transition.fading {
    opacity: 0;
    transform: translate3d(0, 0, 0) scale3d(1, 1, 1);
    transition:
        transform 380ms cubic-bezier(0.4, 0, 0.2, 1),
        opacity 320ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Staggered Cinematic Text / Logo Appears */
.transition-brand {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    z-index: 97;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    pointer-events: none;
}
.transition-brand .transition-logo {
    opacity: 0;
    transform: translate3d(0, 14px, 0) scale3d(0.97, 0.97, 1);
    transition:
        background-position 900ms linear,
        opacity 480ms cubic-bezier(0.22, 1, 0.36, 1) 120ms,
        transform 520ms cubic-bezier(0.22, 1, 0.36, 1) 80ms;
    will-change: opacity, transform;
}
.transition-brand.visible .transition-logo {
    opacity: 1;
    transform: translate3d(0, 0, 0) scale3d(1, 1, 1);
}

.transition-brand .transition-loading {
    opacity: 0;
    transform: translate3d(0, 8px, 0);
    transition:
        opacity 400ms cubic-bezier(0.22, 1, 0.36, 1) 220ms,
        transform 440ms cubic-bezier(0.22, 1, 0.36, 1) 180ms;
    will-change: opacity, transform;
}
.transition-brand.visible .transition-loading {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

.transition-brand.fading .transition-logo {
    opacity: 0;
    transform: translate3d(0, -10px, 0) scale3d(0.98, 0.98, 1);
    transition:
        opacity 280ms cubic-bezier(0.4, 0, 0.2, 1),
        transform 280ms cubic-bezier(0.4, 0, 0.2, 1);
}
.transition-brand.fading .transition-loading {
    opacity: 0;
    transform: translate3d(0, -6px, 0);
    transition:
        opacity 240ms cubic-bezier(0.4, 0, 0.2, 1),
        transform 240ms cubic-bezier(0.4, 0, 0.2, 1);
}

.transition-logo {
    font-size: clamp(2.1rem, 5.8vw, 5.2rem);
    font-weight: 950;
    letter-spacing: 0.075em;
    text-transform: uppercase;
    background: linear-gradient(100deg, #f5d0fe 0%, #a78bfa 32%, #38bdf8 62%, #dbeafe 100%);
    background-size: 220% auto;
    background-position: 0 center;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 44px rgba(99,102,241,0.34);
}
.transition-brand.visible .transition-logo {
    background-position: 100% center;
}

.transition-loading {
    display: inline-block;
    font-weight: 700;
    font-size: clamp(0.86rem, 1.35vw, 1rem);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    white-space: nowrap;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0.38) 0%,
        rgba(255, 255, 255, 0.38) 42%,
        #ffffff 50%,
        rgba(255, 255, 255, 0.38) 58%,
        rgba(255, 255, 255, 0.38) 100%
    );
    background-size: 220% 100%;
    background-position: 100% center;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: transitionLoadingShimmer 2s linear infinite;
}
@keyframes transitionLoadingShimmer {
    to { background-position: -100% center; }
}
@media (prefers-reduced-motion: reduce) {
    .transition-logo { animation: none; }
    .transition-loading {
        animation: none;
        background-position: 50% center;
        -webkit-text-fill-color: rgba(255, 255, 255, 0.72);
        color: rgba(255, 255, 255, 0.72);
    }
}
.chromebook-mode .card-load-transition {
    --expand-dur: 500ms;
}
.chromebook-mode .card-load-transition::before {
    opacity: 0.5;
}
.chromebook-mode .transition-loading {
    animation-timing-function: linear;
}
.chromebook-mode.chromebook-perf-low .card-load-transition {
    --expand-dur: 420ms;
    box-shadow: 0 16px 40px rgba(0,0,0,0.32);
}
.chromebook-mode.chromebook-perf-low .card-load-transition::before {
    display: none;
}
.chromebook-mode.chromebook-perf-low .transition-loading {
    animation: none !important;
}
@media (prefers-reduced-motion: reduce) {
    .card-load-transition {
        --expand-dur: 280ms;
    }
    .card-load-transition::before {
        display: none;
    }
    .transition-brand .transition-logo,
    .transition-brand .transition-loading {
        transition-delay: 0ms !important;
        transition-duration: 200ms !important;
    }
}