/**
 * =========================================================================
 * BUDA OPUS 0 · STAGE 9 // US (终局叙事与母标定格)
 * 工业级规范：100% 命名空间隔离 · 绝对居中 · 严格对齐第 8 幕排版规范
 * =========================================================================
 */

/* 核心舞台视窗 (全画幅绝对居中参考系，零全局干扰) */
#stage9-viewport {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 50;
}

/* ========================================================
   [9.1 阶段] 四行文字：
   屏幕绝对死锁居中 (top: 50%; left: 50%; transform: translate(-50%, -50%))
   块内文字严格左起对齐，严格对齐第 8 幕 24px / 1.35 行高 / 16px gap
   ======================================================== */
#s9-manifesto-stage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: inline-flex;
    flex-direction: column;
    align-items: flex-start;
    width: max-content;
    gap: 16px;
    opacity: 1;
    transition: opacity 1.2s ease;
    pointer-events: none;
}

#s9-manifesto-stage.fade-out {
    opacity: 0 !important;
}

.s9-manifesto-line {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 24px;
    font-weight: 500;
    color: var(--ink-black, #141418);
    line-height: 1.35;
    letter-spacing: -0.01em;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.8s ease, transform 0.8s ease;
    white-space: nowrap;
}

.s9-manifesto-line.visible {
    opacity: 1;
    transform: translateY(0);
}

.s9-dot-item {
    opacity: 0;
    margin-right: 4px;
    font-family: inherit;
    font-size: 24px;
    font-weight: 500;
    line-height: 1.35;
    transition: opacity 0.15s ease;
}

.s9-dot-item.visible {
    opacity: 1;
}

/* ========================================================
   [9.2 阶段] BUDA 竖版整体 LOGO (右上角物理漫反射阴影)
   ======================================================== */
#s9-logo-stage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 3.5s cubic-bezier(0.2, 0.8, 0.2, 1);
    pointer-events: none;
}

#s9-logo-stage.visible {
    opacity: 1;
}

.s9-logo-box {
    width: 220px;
    height: auto;
    /* 
       右上角光源物理映射：
       第一层：紧致暗部 (-5px 7px 5px)，确保 AI STUDIO / BUDA 细线清晰立体下沉
       第二层：环境漫反射 (-10px 14px 16px)，赋予上方徽标温润空间感
    */
    filter: drop-shadow(-5px 7px 5px rgba(0, 0, 0, 0.35))
            drop-shadow(-10px 14px 16px rgba(0, 0, 0, 0.18));
}

.s9-logo-box svg {
    width: 100%;
    height: auto;
    display: block;
}