/* =========================================
   幻灯片核心框架 (slide-framework.css)
   利用 transform scale 实现16:9缩放适配
   ========================================= */

.presentation-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.slide-viewport {
    position: absolute;
    width: var(--slide-width);
    height: var(--slide-height);
    transform-origin: center center;
    background-color: var(--color-bg-light); /* 默认浅色背景 */
    overflow: hidden;
    isolation: isolate;
    /* 无全屏时隐藏立体感，全屏沉浸 */
}

.slides-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.slides-overlay {
    position: absolute;
    inset: 0;
    z-index: 999;
    pointer-events: none;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    pointer-events: none; /* 隐藏时禁止交互 */
    
    /* 默认内边距，可被独立 slide 样式覆盖 */
    padding: 80px 100px;
    z-index: 1;
}

.slide.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    z-index: 10;
}

/* 常用基础布局类 (可用作 fallback) */
.slide-content {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.slide-content.centered {
    justify-content: center;
    align-items: center;
    text-align: center;
}

/* 全局水印 (Logo + 名字) */
.global-watermark {
    position: absolute;
    top: 40px;
    right: 50px;
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 1;
    opacity: 0;         /* 默认隐藏，通过 JS 切换 class 显示 */
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    transform: translateZ(0);
}

.global-watermark.show {
    opacity: 1;
    visibility: visible;
}

.global-watermark.on-dark img {
    filter: brightness(0) invert(1);
}

.global-watermark.on-dark span {
    color: #FFFFFF;
}

.global-watermark img {
    height: 36px;
    object-fit: contain;
}

.global-watermark span {
    font-size: 24px;
    font-weight: 700;
    color: #0A1128; /* 修改为黑色系 */
    letter-spacing: 1px;
}