/* =================================================================
   2. 页面主体
   ================================================================= */
html,
body {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    overflow: hidden;
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #050505;
    background-image:
        radial-gradient(at 0% 0%, hsla(253, 16%, 7%, 1) 0, transparent 50%),
        radial-gradient(at 50% 0%, hsla(225, 39%, 30%, 1) 0, transparent 50%),
        radial-gradient(at 100% 0%, hsla(339, 49%, 30%, 1) 0, transparent 50%);
    background-size: 200% 200%;
    background-attachment: fixed;
    animation: auroraMove 20s ease infinite;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.5s ease, color 0.5s ease;
}

/* =================================================================
   3. APP 主容器
   ================================================================= */
#app {
    width: 95vw;
    max-width: 1300px;
    height: 92vh;
    background: rgba(20, 20, 20, 0.6);
    backdrop-filter: blur(50px);
    border-radius: 24px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.08), inset 0 1px 0 rgba(255, 255, 255, 0.08);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
    z-index: 1;
    transition: background 0.3s ease;
}

#app::before {
    content: '';
    position: absolute;
    top: -150px;
    left: -150px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(49, 194, 124, 0.15), transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.main-wrapper {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: transparent;
    z-index: 1;
}