/* 原生倾斜开关：仅触屏渐进显示，不参与作品画面的绘制。 */
.sg-home-kv__tilt[hidden] { display: none; }
.sg-home-kv__tilt {
    position: relative;
    flex: 0 1 auto;
    max-width: 12rem;
    margin-left: auto;
}
.sg-home-kv__tilt-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 2.75rem;
    padding: 0.5rem 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.32);
    background: rgba(7, 7, 7, 0.6);
    color: var(--sg-brand-text);
    font: inherit;
    font-size: 0.75rem;
    line-height: 1.4;
    cursor: pointer;
    touch-action: manipulation;
}
.sg-home-kv__tilt-button svg {
    flex: 0 0 1rem;
    width: 1rem;
    height: 1rem;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.5;
}
.sg-home-kv__tilt-button:focus-visible { outline: 2px solid currentColor; outline-offset: 4px; }
.sg-home-kv__tilt-button[aria-pressed="true"] { border-color: rgba(255, 255, 255, 0.72); }
.sg-home-kv__tilt-button:disabled { cursor: default; }
.sg-home-kv__tilt-status {
    position: absolute;
    right: 0;
    bottom: calc(100% + 0.5rem);
    width: min(12rem, 40vw);
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.6875rem;
    line-height: 1.5;
    text-align: right;
}
@media (max-width: 40rem) {
    .sg-home-kv__tilt {
        position: absolute;
        right: var(--sg-nav-side);
        bottom: calc(2rem + 4.75rem);
    }
}

/* 共用作品原图是回退基线；只有成功启动的溶解层接管前景。 */
.sg-home-kv--static .sg-home-kv__title {
    top: auto;
    bottom: calc(clamp(2.25rem, 5vw, 5rem) + 8rem);
    left: var(--sg-nav-side);
    width: min(calc(100% - var(--sg-nav-side) * 2), 56rem);
    height: auto;
    color: var(--sg-brand-text);
    font-family: var(--sg-font-ui);
    font-size: clamp(3rem, 7.5vw, 7.5rem);
    font-weight: 800;
    letter-spacing: -0.06em;
    line-height: 1;
    overflow-wrap: anywhere;
}

.sg-home-kv[data-sg-kv-intro="pending"] [data-sg-kv-reveal],
.sg-home-kv[data-sg-kv-intro="running"] [data-sg-kv-reveal],
.sg-home-kv[data-sg-kv-intro="settled"] [data-sg-kv-reveal],
.sg-home-kv[data-sg-kv-intro] [data-sg-logo-dissolve] > img {
    opacity: 0;
}

.sg-home-kv__reveal,
.sg-blackwater-image {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
    .sg-home-kv[data-sg-kv-intro] [data-sg-kv-reveal],
    .sg-home-kv[data-sg-kv-intro] [data-sg-logo-dissolve] > img {
        opacity: 1;
    }
    .sg-home-kv__reveal,
    .sg-blackwater-image {
        display: none;
    }
}

.sg-home-logo-particles {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
    pointer-events: none;
    opacity: 0;
}

.sg-home-logo-particles[data-active="true"] {
    opacity: 1;
}

.sg-home-logo-particles__grain {
    fill: #000;
    opacity: 0;
    animation: sg-home-logo-grain var(--grain-duration) linear var(--grain-delay) infinite;
    animation-play-state: paused;
}

.sg-home-logo-particles[data-active="true"] .sg-home-logo-particles__grain {
    animation-play-state: running;
}

.sg-home-logo-particles > g {
    transition: opacity 100ms linear;
}

.sg-home-logo-particles [data-ready="false"] {
    opacity: 0;
}

.sg-home-logo-particles [data-ready="false"] .sg-home-logo-particles__grain {
    animation-play-state: paused;
}

@keyframes sg-home-logo-grain {
    0% {
        transform: translate(0, 0);
        opacity: 0;
    }
    12% {
        opacity: var(--grain-opacity);
    }
    58% {
        opacity: calc(var(--grain-opacity) * 0.65);
    }
    100% {
        transform: translate(var(--grain-x), var(--grain-y));
        opacity: 0;
    }
}

@media (prefers-reduced-motion: reduce) {
    .sg-home-logo-particles {
        display: none;
    }
    .sg-home-logo-particles__grain {
        animation: none;
    }
}