:root{
    --bd13-navy:#07153a;
    --bd13-blue:#2563eb;
    --bd13-blue2:#1d4ed8;
    --bd13-teal:#14b8a6;
    --bd13-soft:#f6f9ff;
    --bd13-line:#e2e8f0;
    --bd13-muted:#64748b;
    --bd13-card:#ffffff;
    --bd13-shadow:0 24px 70px rgba(15,23,42,.10);
}

.bd13-wrap{
    padding:30px 0 48px;
}

.bd13-breadcrumb{
    display:flex;
    align-items:center;
    gap:9px;
    flex-wrap:wrap;
    margin:0 0 18px;
    color:#64748b;
    font-size:.88rem;
    font-weight:750;
}

.bd13-breadcrumb a{
    color:#475569!important;
    text-decoration:none!important;
}

.bd13-breadcrumb a:hover{
    color:var(--bd13-blue)!important;
}

.bd13-hero{
    display:grid;
    grid-template-columns:360px minmax(0,1fr);
    gap:28px;
    align-items:start;
    border:1px solid rgba(226,232,240,.95);
    border-radius:34px;
    background:
        radial-gradient(circle at top right, rgba(37,99,235,.10), transparent 28rem),
        linear-gradient(135deg,#ffffff 0%,#f8fbff 100%);
    box-shadow:var(--bd13-shadow);
    padding:30px;
    overflow:hidden;
}

.bd13-cover-zone{
    position:sticky;
    top:104px;
}

.bd13-cover-card{
    position:relative;
    border-radius:28px;
    background:linear-gradient(135deg,#eff6ff,#f8fafc);
    padding:18px;
    border:1px solid rgba(226,232,240,.95);
    box-shadow:0 22px 56px rgba(15,23,42,.11);
}

.bd13-cover-frame{
    position:relative;
    border-radius:22px;
    overflow:hidden;
    background:#eaf1fb;
    aspect-ratio:3/4;
    box-shadow:0 18px 45px rgba(15,23,42,.18);
}

.bd13-cover-frame img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
}

.bd13-format-badge{
    position:absolute;
    top:12px;
    left:12px;
    max-width:calc(100% - 24px);
    padding:7px 11px;
    border-radius:999px;
    background:rgba(15,23,42,.92);
    color:#fff;
    font-size:.76rem;
    font-weight:950;
    letter-spacing:.02em;
    backdrop-filter:blur(12px);
    box-shadow:0 12px 30px rgba(15,23,42,.28);
}

.bd13-access-badge{
    position:absolute;
    right:12px;
    bottom:12px;
    padding:7px 10px;
    border-radius:999px;
    background:rgba(255,255,255,.94);
    color:#0f172a;
    font-size:.73rem;
    font-weight:950;
    box-shadow:0 12px 28px rgba(15,23,42,.16);
}

.bd13-cover-actions{
    display:grid;
    gap:10px;
    margin-top:16px;
}

.bd13-btn,
.bd13-form button{
    min-height:46px;
    border-radius:16px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:9px;
    padding:11px 16px;
    border:1px solid transparent;
    text-decoration:none!important;
    font-weight:950;
    cursor:pointer;
    font-size:.94rem;
    line-height:1;
    width:100%;
}

.bd13-btn.primary{
    color:#fff!important;
    background:linear-gradient(135deg,var(--bd13-blue),var(--bd13-blue2));
    box-shadow:0 16px 34px rgba(37,99,235,.24);
}

.bd13-btn.outline{
    color:var(--bd13-navy)!important;
    background:#fff;
    border-color:var(--bd13-line);
}

.bd13-btn.ghost,
.bd13-form button{
    color:var(--bd13-blue)!important;
    background:#eff6ff;
    border-color:#bfdbfe;
}

.bd13-form{
    margin:0;
}

.bd13-main{
    min-width:0;
}

.bd13-kicker{
    display:flex;
    gap:8px;
    align-items:center;
    flex-wrap:wrap;
    margin-bottom:14px;
}

.bd13-chip{
    display:inline-flex;
    align-items:center;
    gap:7px;
    min-height:31px;
    padding:7px 11px;
    border-radius:999px;
    background:#eff6ff;
    color:#1d4ed8;
    font-size:.8rem;
    font-weight:900;
}

.bd13-chip.teal{
    background:#ecfeff;
    color:#0f766e;
}

.bd13-main h1{
    margin:0;
    max-width:860px;
    color:var(--bd13-navy);
    font-size:clamp(2rem,4vw,4rem);
    line-height:1.04;
    letter-spacing:-.065em;
    font-weight:950;
}

.bd13-author{
    display:flex;
    align-items:flex-start;
    gap:10px;
    margin:16px 0 0;
    color:#334155;
    font-weight:800;
    line-height:1.55;
}

.bd13-author svg{
    flex:0 0 auto;
    margin-top:2px;
}

.bd13-summary{
    margin:18px 0 0;
    max-width:820px;
    color:#475569;
    font-size:1.02rem;
    line-height:1.78;
}

.bd13-meta-grid{
    display:grid;
    grid-template-columns:repeat(4,minmax(0,1fr));
    gap:12px;
    margin-top:22px;
}

.bd13-meta-item{
    min-height:92px;
    padding:14px;
    border-radius:20px;
    border:1px solid rgba(226,232,240,.95);
    background:rgba(255,255,255,.78);
    box-shadow:0 10px 28px rgba(15,23,42,.045);
}

.bd13-meta-item dt{
    margin:0 0 7px;
    color:#64748b;
    font-size:.78rem;
    font-weight:850;
}

.bd13-meta-item dd{
    margin:0;
    color:var(--bd13-navy);
    font-size:.95rem;
    font-weight:950;
    line-height:1.35;
    overflow-wrap:anywhere;
}

.bd13-file-section{
    margin-top:22px;
    padding:18px;
    border-radius:24px;
    border:1px solid rgba(226,232,240,.95);
    background:#fff;
    box-shadow:0 14px 34px rgba(15,23,42,.055);
}

.bd13-section-title{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:16px;
    margin-bottom:14px;
}

.bd13-section-title h2{
    margin:0;
    color:var(--bd13-navy);
    font-size:1.12rem;
    letter-spacing:-.03em;
}

.bd13-section-title small{
    color:#64748b;
    font-weight:800;
}

.bd13-file-list{
    display:grid;
    gap:10px;
}

.bd13-file-row{
    display:grid;
    grid-template-columns:auto minmax(0,1fr) auto;
    gap:12px;
    align-items:center;
    padding:12px;
    border:1px solid var(--bd13-line);
    border-radius:18px;
    background:#f8fbff;
}

.bd13-file-icon{
    width:44px;
    height:44px;
    display:flex;
    align-items:center;
    justify-content:center;
    border-radius:15px;
    background:#eff6ff;
    color:var(--bd13-blue);
    font-weight:950;
    font-size:.78rem;
}

.bd13-file-row strong{
    display:block;
    color:var(--bd13-navy);
    font-size:.94rem;
    line-height:1.3;
}

.bd13-file-row span{
    display:block;
    margin-top:3px;
    color:#64748b;
    font-size:.8rem;
    font-weight:750;
}

.bd13-file-actions{
    display:flex;
    align-items:center;
    gap:8px;
}

.bd13-mini-btn{
    min-height:34px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    padding:8px 11px;
    border-radius:12px;
    font-size:.78rem;
    font-weight:950;
    text-decoration:none!important;
    border:1px solid var(--bd13-line);
    color:#334155!important;
    background:#fff;
}

.bd13-mini-btn.primary{
    border-color:var(--bd13-blue);
    background:var(--bd13-blue);
    color:#fff!important;
}

.bd13-body-grid{
    display:grid;
    grid-template-columns:minmax(0,1fr) 330px;
    gap:24px;
    margin-top:28px;
}

.bd13-card{
    border:1px solid rgba(226,232,240,.95);
    border-radius:28px;
    background:#fff;
    box-shadow:0 16px 44px rgba(15,23,42,.065);
    padding:24px;
}

.bd13-card h2{
    margin:0 0 14px;
    color:var(--bd13-navy);
    letter-spacing:-.04em;
    font-size:1.45rem;
}

.bd13-prose{
    color:#334155;
    line-height:1.86;
    font-size:1rem;
}

.bd13-muted{
    color:#64748b;
    line-height:1.7;
}

.bd13-info-list{
    display:grid;
    gap:0;
}

.bd13-info-list div{
    display:flex;
    justify-content:space-between;
    gap:16px;
    padding:12px 0;
    border-bottom:1px dashed var(--bd13-line);
}

.bd13-info-list div:last-child{
    border-bottom:0;
}

.bd13-info-list dt{
    color:#64748b;
    font-weight:850;
}

.bd13-info-list dd{
    margin:0;
    text-align:right;
    color:var(--bd13-navy);
    font-weight:900;
    overflow-wrap:anywhere;
}

.bd13-related{
    margin-top:28px;
}

.bd13-related-grid{
    display:grid;
    grid-template-columns:repeat(6,minmax(0,1fr));
    gap:16px;
}

.bd13-related-card{
    border:1px solid rgba(226,232,240,.95);
    border-radius:22px;
    overflow:hidden;
    background:#fff;
    box-shadow:0 14px 34px rgba(15,23,42,.06);
    text-decoration:none!important;
    color:var(--bd13-navy)!important;
}

.bd13-related-cover{
    position:relative;
    aspect-ratio:3/4;
    background:#eff6ff;
}

.bd13-related-cover img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
}

.bd13-related-cover span{
    position:absolute;
    left:8px;
    top:8px;
    padding:5px 8px;
    border-radius:999px;
    background:rgba(15,23,42,.88);
    color:#fff;
    font-size:.66rem;
    font-weight:950;
}

.bd13-related-body{
    padding:11px;
}

.bd13-related-body strong{
    display:block;
    font-size:.9rem;
    line-height:1.28;
}

.bd13-related-body small,
.bd13-related-body em{
    display:block;
    margin-top:5px;
    color:#64748b;
    font-size:.76rem;
    line-height:1.3;
    font-style:normal;
}

@media(max-width:1080px){
    .bd13-hero{
        grid-template-columns:300px minmax(0,1fr);
    }

    .bd13-meta-grid{
        grid-template-columns:repeat(2,minmax(0,1fr));
    }

    .bd13-related-grid{
        grid-template-columns:repeat(4,minmax(0,1fr));
    }
}

@media(max-width:860px){
    .bd13-wrap{
        padding:18px 0 32px;
    }

    .bd13-hero{
        grid-template-columns:1fr;
        padding:18px;
        border-radius:26px;
    }

    .bd13-cover-zone{
        position:static;
        max-width:320px;
        margin:0 auto;
        width:100%;
    }

    .bd13-main h1{
        font-size:2.2rem;
    }

    .bd13-body-grid{
        grid-template-columns:1fr;
    }

    .bd13-file-row{
        grid-template-columns:auto minmax(0,1fr);
    }

    .bd13-file-actions{
        grid-column:1 / -1;
        display:grid;
        grid-template-columns:1fr 1fr;
    }

    .bd13-related-grid{
        display:flex;
        overflow-x:auto;
        gap:14px;
        padding-bottom:10px;
        scroll-snap-type:x mandatory;
        scrollbar-width:none;
    }

    .bd13-related-grid::-webkit-scrollbar{
        display:none;
    }

    .bd13-related-card{
        flex:0 0 150px;
        scroll-snap-align:start;
    }
}

@media(max-width:560px){
    .bd13-breadcrumb{
        font-size:.78rem;
    }

    .bd13-main h1{
        font-size:1.88rem;
    }

    .bd13-summary{
        font-size:.96rem;
    }

    .bd13-meta-grid{
        grid-template-columns:1fr;
    }

    .bd13-card{
        padding:18px;
        border-radius:22px;
    }

    .bd13-section-title{
        align-items:flex-start;
        flex-direction:column;
        gap:6px;
    }

    .bd13-cover-actions{
        position:sticky;
        bottom:88px;
        z-index:30;
    }
}