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

html,body{

    width:100%;
    height:100%;

    overflow:hidden;

    background:#050505;

    color:white;

    font-family:
        "Helvetica Neue",
        "PingFang SC",
        sans-serif;

    user-select:none;
}

body{

    position:relative;
}

/* 动态暗角 */

body::after{

    content:'';

    position:fixed;

    inset:0;

    pointer-events:none;

    box-shadow:
        inset 0 0 240px rgba(0,0,0,0.9);

    z-index:20;
}

/* 胶片颗粒 */

.grain{

    position:fixed;

    inset:0;

    background-image:
        url("assets/grain.png");

    opacity:0.05;

    mix-blend-mode:overlay;

    pointer-events:none;

    animation:grain 0.4s steps(2)
    infinite;

    z-index:10;
}

@keyframes grain{

    0%{
        transform:translate(0,0);
    }

    25%{
        transform:translate(-2%,-3%);
    }

    50%{
        transform:translate(3%,2%);
    }

    75%{
        transform:translate(-1%,4%);
    }

    100%{
        transform:translate(0,0);
    }
}

/* 顶部 */

.header{

    position:fixed;

    top:0;
    left:0;

    width:100%;

    padding:40px 60px;

    z-index:100;

    backdrop-filter:blur(10px);
}

.brand{

    display:flex;

    align-items:center;

    gap:20px;
}

.logo{

    width:60px;
    height:60px;

    border-radius:50%;

    border:1px solid rgba(255,255,255,0.2);

    display:flex;

    align-items:center;
    justify-content:center;

    font-size:24px;

    letter-spacing:2px;
}

.brand-info h1{

    font-size:32px;

    font-weight:300;

    letter-spacing:8px;
}

.brand-info p{

    margin-top:8px;

    font-size:12px;

    letter-spacing:4px;

    color:rgba(255,255,255,0.6);
}

/* canvas */

#webgl-canvas{

    width:100vw;
    height:100vh;

    display:block;
}

/* 控制 */

.controls{

    position:fixed;

    bottom:40px;

    left:50%;

    transform:translateX(-50%);

    display:flex;

    gap:20px;

    z-index:100;
}

.controls button{

    width:52px;
    height:52px;

    border-radius:50%;

    border:none;

    background:
        rgba(255,255,255,0.08);

    color:white;

    font-size:20px;

    cursor:pointer;

    backdrop-filter:blur(10px);

    transition:0.3s;
}

.controls button:hover{

    background:
        rgba(229,72,77,0.3);

    transform:translateY(-2px);
}

/* 全屏 */

.lightbox{

    position:fixed;

    inset:0;

    background:
        rgba(0,0,0,0.95);

    display:flex;

    align-items:center;
    justify-content:center;

    opacity:0;
    visibility:hidden;

    transition:0.4s;

    z-index:999;
}

.lightbox.show{

    opacity:1;

    visibility:visible;
}

.lightbox img{

    max-width:92%;

    max-height:92%;

    object-fit:contain;
}

#closeLightbox{

    position:absolute;

    top:40px;
    right:60px;

    font-size:42px;

    cursor:pointer;
}

/* 手机 */

@media(max-width:900px){

    .header{

        padding:25px;
    }

    .brand-info h1{

        font-size:24px;
    }

}