/* ByTowns centered loading overlay
   Dark contrast screen + centered branded loader. */

:root {
    --bt-loader-bg: rgba(8, 10, 14, 0.72);
    --bt-loader-card-bg: rgba(15, 18, 24, 0.82);
    --bt-loader-border: rgba(255, 255, 255, 0.08);
    --bt-loader-orange: #ff681f;
    --bt-loader-white: #ffffff;
    --bt-loader-muted: #a7b0c0;
}

.bt-page-loader-overlay {
    position: fixed;
    inset: 0;
    z-index: 2147482400;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: var(--bt-loader-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity .2s ease, visibility .2s ease;
}

html.bt-loader-active .bt-page-loader-overlay {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.bt-page-loader-card {
    width: min(280px, 84vw);
    min-height: 220px;
    border-radius: 32px;
    border: 1px solid var(--bt-loader-border);
    background:
        linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02)),
        var(--bt-loader-card-bg);
    box-shadow:
        0 20px 80px rgba(0, 0, 0, 0.36),
        inset 0 1px 0 rgba(255,255,255,.03);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    text-align: center;
    padding: 28px 24px;
}

.bt-page-loader-mark {
    position: relative;
    width: 92px;
    height: 92px;
    display: grid;
    place-items: center;
}

.bt-page-loader-ring {
    position: absolute;
    inset: 0;
    border-radius: 999px;
    border: 5px solid rgba(255,255,255,.10);
    border-top-color: var(--bt-loader-orange);
    border-right-color: rgba(255, 104, 31, .35);
    animation: btLoaderSpin .88s linear infinite;
    box-shadow: 0 0 0 1px rgba(255,255,255,.02) inset;
}

.bt-page-loader-core {
    width: 68px;
    height: 68px;
    border-radius: 22px;
    display: grid;
    place-items: center;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.08), rgba(255,255,255,.02)),
                rgba(255, 104, 31, 0.12);
    border: 1px solid rgba(255,255,255,.05);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.05);
}

.bt-page-loader-logo {
    font-size: 30px;
    line-height: 1;
    font-weight: 1000;
    font-style: italic;
    letter-spacing: -.09em;
    text-transform: lowercase;
    background: linear-gradient(90deg, #5a606c 0%, #707785 28%, #ffffff 54%, #ffffff 100%);
    background-size: 220% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: btLoaderSweep 1.15s ease-in-out infinite;
    user-select: none;
}

.bt-page-loader-title {
    margin: 0;
    color: var(--bt-loader-white);
    font-size: 18px;
    font-weight: 900;
    letter-spacing: -.03em;
}

.bt-page-loader-subtitle {
    margin: -8px 0 0;
    color: var(--bt-loader-muted);
    font-size: 13px;
    line-height: 1.45;
    font-weight: 700;
}

@keyframes btLoaderSpin {
    to { transform: rotate(360deg); }
}

@keyframes btLoaderSweep {
    0% { background-position: 120% 50%; }
    100% { background-position: -40% 50%; }
}

@media (max-width: 640px) {
    .bt-page-loader-card {
        width: min(250px, 86vw);
        min-height: 198px;
        border-radius: 28px;
        gap: 16px;
        padding: 24px 20px;
    }

    .bt-page-loader-mark {
        width: 84px;
        height: 84px;
    }

    .bt-page-loader-core {
        width: 62px;
        height: 62px;
        border-radius: 20px;
    }

    .bt-page-loader-logo {
        font-size: 27px;
    }

    .bt-page-loader-title {
        font-size: 17px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .bt-page-loader-overlay {
        transition: none;
    }

    .bt-page-loader-ring,
    .bt-page-loader-logo {
        animation: none;
    }
}