/* ============================================
   LOADER ANIMATION
============================================ */
.loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

/* Cover the seam between top and bottom halves */
.loader::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 4px;
    margin-top: -2px;
    background: #0a0a0a;
    z-index: 1;
    transition: opacity 0.3s ease;
}

.loader.reveal::before {
    opacity: 0;
}

.loader.active {
    pointer-events: all;
}

/* Top and bottom halves that will split */
.loader-top,
.loader-bottom {
    position: absolute;
    left: 0;
    right: 0;
    background: #0a0a0a;
    transition: transform 1.2s cubic-bezier(0.65, 0, 0.35, 1);
    /* Force GPU rendering to prevent seam artifacts */
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
}

.loader-top {
    top: 0;
    /* Overlap by 2px to prevent seam line in Chrome */
    height: calc(50% + 2px);
}

.loader-bottom {
    bottom: 0;
    /* Overlap by 2px to prevent seam line in Chrome */
    height: calc(50% + 2px);
}

/* When revealing, split apart */
.loader.reveal .loader-top {
    -webkit-transform: translate3d(0, -100%, 0);
    transform: translate3d(0, -100%, 0);
}

.loader.reveal .loader-bottom {
    -webkit-transform: translate3d(0, 100%, 0);
    transform: translate3d(0, 100%, 0);
}

.loader-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.9s ease, transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.loader.intro .loader-content {
    opacity: 1;
    transform: translateY(0);
}

.loader.reveal .loader-content {
    opacity: 0;
    transition: opacity 0.5s ease;
}

.loader-text {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 500;
    letter-spacing: -0.02em;
    color: #ffffff;
}

.loader-gen,
.loader-ctx {
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.loader-divider {
    opacity: 0.4;
    transition: opacity 0.4s ease;
}

.loader-line {
    width: 280px;
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
}

.loader-line-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: #ffffff;
}

/* Percent display at bottom */
.loader-percent {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
    z-index: 3;
    opacity: 0;
    transition: opacity 0.75s ease, transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
}

.loader.intro .loader-percent {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.loader.reveal .loader-percent {
    opacity: 0;
}

/* Split animation state */
.loader.split .loader-gen {
    transform: translateX(-80px);
}

.loader.split .loader-ctx {
    transform: translateX(80px);
}

.loader.split .loader-divider {
    opacity: 0;
}

/* Line clear state */
.loader.line-clear .loader-line {
    transform: scaleX(0);
    opacity: 0;
}

/* Hide completely after animation */
.loader.hidden {
    visibility: hidden;
    display: none;
}

/* Responsive */
@media (max-width: 768px) {
    .loader-text {
        gap: 0.5rem;
    }

    .loader-line {
        width: 200px;
    }

    .loader.split .loader-gen {
        transform: translateX(-50px);
    }

    .loader.split .loader-ctx {
        transform: translateX(50px);
    }
}