:root{
    --bg:#0f1117;
    --card:#171b23;
    --text:#e6eaf3;
    --sub:#8a90a2;
    --primary:#6c8cff;
}

body.light{
    --bg:#f5f6fa;
    --card:#ffffff;
    --text:#222;
    --sub:#555;
    --primary:#4a6cff;
}

body{
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto;
    background:var(--bg);
    color:var(--text);
    transition:0.3s;
    scroll-behavior:smooth;
}

/* ===== Navigation Bar ===== */
.navbar{
    position:sticky;
    top:0;
    background:var(--card);
    border-bottom:1px solid rgba(108,140,255,0.1);
    z-index:1000;
    backdrop-filter:blur(10px);
    background:rgba(23,27,35,0.8);
}

body.light .navbar{
    background:rgba(255,255,255,0.8);
}

.nav-container{
    max-width:1100px;
    margin:auto;
    padding:15px 20px;
    display:flex;
    justify-content:space-between;
    align-items:center;
}

.nav-logo{
    font-size:20px;
    font-weight:bold;
    color:var(--primary);
    text-decoration:none;
    transition:0.3s;
}

.nav-logo:hover{
    opacity:0.8;
}

.nav-menu{
    display:flex;
    list-style:none;
    gap:30px;
    margin:0;
    padding:0;
}

.nav-link{
    color:var(--text);
    text-decoration:none;
    font-size:14px;
    transition:color 0.3s;
}

.nav-link:hover{
    color:var(--primary);
}

.nav-social{
    display:flex;
    gap:15px;
}

.social-icon{
    color:var(--sub);
    font-size:18px;
    transition:0.3s;
    text-decoration:none;
}

.social-icon:hover{
    color:var(--primary);
    transform:translateY(-2px);
}

.container{
    max-width:1100px;
    margin:auto;
    padding:60px 20px;
}

h1{
    text-align:center;
    font-size:2.5em;
    margin-bottom:10px;
}

.subtitle{
    text-align:center;
    color:var(--sub);
    margin-bottom:30px;
    font-size:16px;
}

.logos{
    display:flex;
    justify-content:center;
    gap:40px;
    margin-bottom:30px;
    flex-wrap:wrap;
}

.logos img{
    height:var(--logo-height,60px); /* use CSS variable with 60px default */
    max-height:80px;
}

.btn{
    background:var(--primary);
    color:white;
    padding:12px 28px;
    border-radius:25px;
    border:none;
    cursor:pointer;
    text-decoration:none;
    transition:0.3s ease;
    font-weight:500;
    display:inline-flex;
    align-items:center;
    gap:8px;
}

.btn:hover{
    transform:translateY(-3px);
    box-shadow:0 8px 20px rgba(108,140,255,0.3);
}

.btn:active{
    transform:translateY(-1px);
}

.btn.small{
    padding:8px 18px;
    font-size:14px;
}

.btn-primary{
    background:var(--primary);
}

.btn-secondary{
    background:#4a5568;
}

.btn-secondary:hover{
    background:#5a6578;
    box-shadow:0 8px 20px rgba(74,85,104,0.3);
}

body.light .btn-secondary{
    background:#ddd;
    color:#222;
}

body.light .btn-secondary:hover{
    background:#ccc;
}

.btn-group{
    display:flex;
    justify-content:center;
    gap:20px;
    margin-bottom:60px;
    flex-wrap:wrap;
}

.card{
    background:var(--card);
    padding:40px;
    border-radius:18px;
    transition:0.3s ease;
    border:1px solid rgba(108,140,255,0.1);
    max-width:800px;        /* restrict width similar to abstract */
    margin:auto;            /* center cards */
}


.card:hover{
    border:1px solid rgba(108,140,255,0.3);
    box-shadow:0 10px 40px rgba(108,140,255,0.1);
}

.section{
    margin-bottom:60px;
}

.section-title{
    font-size:24px;
    margin-bottom:20px;
    font-weight:600;
}

#abstract p{
    font-style:italic;
    line-height:1.6;
}

/* ===== Method two-column layout ===== */
/* ===== Method layout (cleaned) ===== */
.method-grid{
    display:flex;
    flex-direction:column;
    gap:24px;
}
.method-item{
    display:grid;
    grid-template-columns:1fr auto;
    gap:20px;
    align-items:center;
}
.method-text h4{
    margin:0 0 8px 0;
}
.method-image img{
    width:var(--method-image-width,100%); /* 默认缩放为原来的 27% */
    max-width:100%;
    height:auto;
    border-radius:10px;
    display:block;
}

@media(max-width:768px){
    .method-item{
        grid-template-columns:1fr;
    }
    .method-image{order:-1; margin-bottom:10px;}
    .method-image img{width:100%; max-width:100%;}
}

/* ===== Authors Section ===== */
.authors-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
    gap:30px;
    margin-top:20px;
}

.author-card{
    text-align:center;
    padding:20px;
    background:rgba(108,140,255,0.05);
    border-radius:12px;
    transition:0.3s ease;
}

.author-card:hover{
    background:rgba(108,140,255,0.1);
    transform:translateY(-5px);
}

.author-avatar{
    font-size:50px;
    margin-bottom:10px;
}

.author-name{
    font-weight:600;
.method-grid{
    display:flex;
    flex-direction:column;
    gap:24px;
}
.method-item{
    display:grid;
    grid-template-columns:1fr auto;
    gap:20px;
    align-items:center;
}
.method-text h4{
    margin:0 0 8px 0;
}
.method-image img{
    width:var(--method-image-width,260px);
    max-width:40%;
    height:auto;
    border-radius:10px;
}

@media(max-width:768px){
    .method-item{
        grid-template-columns:1fr;
    }
    .method-image{order:-1; margin-bottom:10px;}
    .method-image img{width:100%; max-width:100%;}
}
    font-size:16px;
    margin-bottom:5px;
}

.author-affiliation{
    color:var(--sub);
    font-size:13px;
}

.bibtex-header{
    display:flex;
    justify-content:space-between;
    align-items:center;
    margin-bottom:20px;
}

.bibtex-controls{
    display:flex;
    align-items:center;
    gap:10px;
}

/* ===== Visualization size control ===== */
.compare-wrapper{
    position:relative;
    max-width:1000px;   /* 👈 在这里调大小 */
    margin:auto;
    overflow:hidden;
    border-radius:16px;
}

.compare-wrapper img{
    width:100%;
    aspect-ratio:16/9; /* 👈 调比例 */
    object-fit:cover;
}

/* Spinner overlay while images load */
.compare-wrapper .compare-spinner{
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%);
    z-index:20;
    display:none;
    pointer-events:none;
}
.compare-wrapper .spinner-circle{
    width:48px;
    height:48px;
    border:6px solid rgba(255,255,255,0.15);
    border-top-color:var(--primary);
    border-radius:50%;
    animation:spin 1s linear infinite;
}
@keyframes spin{
    to{ transform:rotate(360deg); }
}

.original-img{position:relative;}
.recon-img{
    position:absolute;
    top:0;
    left:0;
    clip-path:inset(0 50% 0 0);
}

.slider-line{
    position:absolute;
    top:0;bottom:0;
    width:3px;
    background:white;
    left:50%;
    transform:translateX(-50%);
}

.slider-handle{
    position:absolute;
    top:50%;
    left:50%;
    width:28px;
    height:28px;
    background:white;
    border-radius:50%;
    transform:translate(-50%,-50%);
    transition:box-shadow 0.3s;
}

.slider-handle:hover{
    box-shadow:0 0 15px rgba(255,255,255,0.5);
}

.label{
    position:absolute;
    top:15px;
    padding:5px 10px;
    background:rgba(0,0,0,0.6);
    color:white;
    border-radius:20px;
    font-size:13px;
    backdrop-filter:blur(5px);
}

.label-left{
    left:15px;
}

.label-right{
    right:15px;
}

.gallery-controls{
    display:flex;
    justify-content:center;
    gap:15px;
    margin-bottom:20px;
    align-items:center;
    flex-wrap:wrap;
}

.image-counter{
    color:var(--sub);
    font-size:14px;
    min-width:40px;
    text-align:center;
}

.magnifier{
    position:absolute;
    width:150px;  /* 👈 放大镜大小 */
    height:150px;
    border-radius:50%;
    border:3px solid white;
    display:none;
    pointer-events:none;
    overflow:hidden;
}

pre{
    background:#111;
    padding:20px;
    border-radius:10px;
    overflow:auto;
}

body.light pre{
    background:#eee;
}

footer{
    text-align:center;
    color:var(--sub);
    padding:30px 20px;
    border-top:1px solid rgba(108,140,255,0.1);
    margin-top:60px;
}

.theme-toggle{
    position:fixed;
    top:20px;
    right:20px;
    padding:10px 12px;
    border-radius:50%;
    border:2px solid var(--sub);
    cursor:pointer;
    background:var(--card);
    color:var(--text);
    font-size:18px;
    transition:0.3s;
    z-index:1001;
}

.theme-toggle:hover{
    border-color:var(--primary);
    transform:rotate(20deg);
}

/* ===== Responsive Design ===== */
@media(max-width:768px){
    .container{
        padding:40px 15px;
    }

    h1{
        font-size:1.8em;
    }

    .nav-container{
        flex-wrap:wrap;
        gap:20px;
    }

    .nav-menu{
        gap:15px;
        font-size:12px;
    }

    .nav-social{
        gap:10px;
    }

    .social-icon{
        font-size:16px;
    }

    .card{
        padding:25px 15px;
    }

    .section-title{
        font-size:20px;
    }

    .authors-grid{
        grid-template-columns:1fr;
        gap:15px;
    }

    .btn-group{
        gap:10px;
    }

    .btn{
        padding:10px 20px;
        font-size:14px;
    }

    .bibtex-header{
        flex-direction:column;
        align-items:flex-start;
        gap:15px;
    }

    .gallery-controls{
        gap:10px;
    }

    .logos{
        gap:20px;
    }

    .logos img{
        height:50px;
    }

    .compare-wrapper{
        max-width:100%;
    }
}

@media(max-width:480px){
    .container{
        padding:30px 10px;
    }

    h1{
        font-size:1.5em;
        margin-bottom:5px;
    }

    .subtitle{
        font-size:13px;
        margin-bottom:20px;
    }

    .nav-menu{
        display:none;
    }

    .nav-container{
        justify-content:space-between;
    }

    .card{
        padding:20px 12px;
        margin-bottom:30px;
    }

    .section-title{
        font-size:18px;
    }

    .btn{
        padding:8px 16px;
        font-size:13px;
    }

    .btn.small{
        padding:6px 12px;
        font-size:12px;
    }

    pre{
        padding:12px;
        font-size:11px;
    }

    .theme-toggle{
        top:15px;
        right:15px;
        padding:8px 10px;
    }
}