:root {
    --bg-color: #f2f4f8;
    --text-main: #1d1d1f;
    --text-muted: #515154;
    --btn-bg: #ffffff;
    --btn-hover: #e5e5ea;
    --font-title: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-main);
    overflow: hidden;
    position: relative;
}

body::before,
body::after {
    content: '';
    position: fixed;
    width: 70vw;
    height: 70vw;
    border-radius: 50%;
    filter: blur(120px);
    -webkit-filter: blur(120px);
    z-index: -1;
    opacity: 0.6;
    pointer-events: none;
    animation: aurora 12s infinite ease-in-out alternate;
}

body::before {
    background: radial-gradient(circle, rgba(45, 185, 255, 0.6) 0%, rgba(255, 255, 255, 0) 70%);
    top: -15vw;
    left: -10vw;
}

body::after {
    background: radial-gradient(circle, rgba(0, 175, 0, 0.4) 0%, rgba(255, 255, 255, 0) 70%);
    bottom: -15vw;
    right: -10vw;
    animation-delay: -5s;
}

@keyframes aurora {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(15vw, 20vw) scale(1.3); }
    100% { transform: translate(-20vw, 10vw) scale(0.8); }
}

.scroll-container {
    height: 100vh;
    overflow-y: auto; /* 改为 auto */
    scroll-snap-type: y proximity; /* 改为 proximity，这样在内容过长时滚动更自然 */
    scroll-behavior: smooth;
}

.page-section {
    min-height: 100vh; /* 保证至少占满一屏 */
    height: auto;      /* 允许根据内容自动调整高度，不再强制死守一屏 */
    width: 100vw;
    scroll-snap-align: start;
    padding: 100px 5% 60px; /* 增加上下留白，防止被导航栏遮挡 */
    display: flex;
    flex-direction: column;
    justify-content: center; /* 内容居中 */
}

.section-content {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
}

#main-demo {
    justify-content: flex-start;
    padding-top: 12vh;
}

.placeholder-content { display: flex; justify-content: center; align-items: center; height: 100%; font-size: 2rem; color: #aaa; }
#rollout { background-color: rgba(255, 255, 255, 0.2); backdrop-filter: blur(20px); }
#diversity { background-color: rgba(255, 255, 255, 0.4); backdrop-filter: blur(20px); }

@media (max-height: 600px), (max-width: 1024px) {
    .scroll-container {
        scroll-snap-type: none; /* 小窗口下允许自由滚动，不再强制对齐 */
    }
}