.seo-intro{background:var(--surface);border-bottom:1.5px solid var(--border);padding:52px 0}
.seo-intro-inner{max-width:1140px;margin:0 auto;padding:0 28px}
.seo-intro-inner p{font-size:1rem;color:var(--text-mid);line-height:1.75;margin-bottom:14px;max-width:860px}
.seo-intro-inner strong{color:var(--blue);font-weight:700}
.portfolio-section{padding:72px 0 80px}
.category-block{margin-bottom:72px}
.cat-header{display:flex;align-items:flex-start;gap:20px;margin-bottom:32px;padding-bottom:24px;border-bottom:1.5px solid var(--border)}
.cat-icon{width:52px;height:52px;border-radius:14px;background:var(--blue-tint);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.cat-icon svg{width:26px;height:26px;fill:var(--blue)}
.cat-text h2{font-size:1.4rem;font-weight:800;color:var(--ink);margin-bottom:4px}
.cat-text p{font-size:.88rem;color:var(--text-muted)}
.cat-count{display:inline-block;background:var(--blue-tint);color:var(--blue);padding:3px 10px;border-radius:100px;font-size:.72rem;font-weight:700;margin-left:8px}
.ref-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.ref-item{border-radius:16px;overflow:hidden;position:relative;background:var(--surface);border:1.5px solid var(--border);box-shadow:var(--shadow-sm);transition:all .28s}
.ref-item:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.ref-img-wrap{height:240px;overflow:hidden;cursor:pointer}
.ref-img-wrap img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.ref-item:hover .ref-img-wrap img{transform:scale(1.07)}
.ref-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;cursor:pointer}
.ref-item:hover .ref-overlay{background:rgba(18,96,212,.12)}
.ref-zoom{width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.9);display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .25s}
.ref-item:hover .ref-zoom{opacity:1}
.ref-zoom svg{width:20px;height:20px;fill:var(--blue)}
#lightbox{position:fixed;inset:0;background:rgba(7,15,30,.95);display:none;justify-content:center;align-items:center;z-index:3000;padding:20px}
#lightbox.open{display:flex}
#lb-img{max-width:100%;max-height:88vh;border-radius:14px}
.lb-close{position:absolute;top:20px;right:24px;width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.2);color:#fff;font-size:1.4rem;cursor:pointer}
.empty-state{text-align:center;padding:80px 20px;color:var(--text-muted)}
@media(max-width:860px){.ref-grid{grid-template-columns:1fr 1fr}}
@media(max-width:540px){.ref-grid{grid-template-columns:1fr}}