/* Hallmark · component: square C opening-loader · genre: modern-minimal · theme: locked 1confirmed
 * states: loading · assembled · disassembling · exiting · revealed · resetting · error
 * craft: tier-A particle build resolving into the exact C-and-check vector geometry
 * motion: finite cover → pixel mark → full-page reveal; loop is preview-only
 * contrast: pass · reduced-motion: bypass · pre-emit critique: P5 H5 E5 S5 R5 V5
 */

:root {
    --loader-green: var(--color-accent);
    --loader-paper: var(--color-accent-ink);
    --loader-mark-width: clamp(11.5rem, 34vmin, 15.5rem);
}

.brand-loader,
.brand-loader *,
.brand-loader *::before,
.brand-loader *::after {
    box-sizing: border-box;
}

.loader-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.brand-loader {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal, 400);
    isolation: isolate;
    display: grid;
    place-items: center;
    overflow: hidden;
    background: var(--loader-green);
    opacity: 1;
    pointer-events: auto;
}

/* JavaScript normally completes in about two seconds. This independent CSS
   dismissal is the failure mode: a blocked script can delay the page, never
   trap it. The looping preview opts out through data-loop="true". */
.brand-loader[data-loop="false"] {
    animation: brand-loader-failsafe 240ms linear 4s forwards;
}

.brand-loader[data-cover-ready="true"] {
    background: transparent;
}

.brand-loader[data-state="resetting"] {
    opacity: 1;
    transition: none;
}

.brand-loader[data-state="revealed"] {
    visibility: hidden;
    pointer-events: none;
}

@keyframes brand-loader-failsafe {
    to {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }
}

.brand-loader__cover,
.brand-loader__canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

.brand-loader__cover {
    z-index: 0;
}

.brand-loader__canvas {
    z-index: 1;
    transform: scale(1);
}

.brand-loader__mark {
    position: relative;
    z-index: 2;
    width: var(--loader-mark-width);
    height: auto;
    display: block;
    overflow: visible;
    opacity: 0;
    transform: scale(0.965);
    filter: drop-shadow(0 1.25rem 2.4rem oklch(18% 0.045 169 / 0.16));
    transition:
        opacity 160ms var(--ease-out),
        transform 220ms var(--ease-out);
    will-change: opacity, transform;
}

.brand-loader__shell {
    stroke: var(--loader-paper);
}

.brand-loader__check {
    stroke: var(--loader-paper);
}

.brand-loader[data-state="error"] .brand-loader__mark {
    opacity: 1;
    transform: scale(1);
}

@media (prefers-reduced-motion: reduce) {
    .brand-loader[data-loop="false"] {
        display: none;
    }

    .brand-loader__canvas {
        display: none;
    }

    .brand-loader__mark {
        opacity: 0 !important;
        transition: none !important;
    }

    .brand-loader[data-state="exiting"],
    .brand-loader[data-state="revealed"] {
        opacity: 0;
        transition: opacity 150ms linear;
    }
}