*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#0f1117;--card:#1a1d27;--card2:#222533;--border:#2a2d3a;
  --text:#e1e4ed;--text2:#8b8fa3;--accent:#4f8cff;--accent2:#3d6fd9;
  --green:#34d399;--red:#f87171;--yellow:#fbbf24;--orange:#fb923c;
}
body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;min-height:100vh}
header{background:var(--card);border-bottom:1px solid var(--border);padding:16px 24px;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:16px}
.logo{display:flex;align-items:center;gap:12px}
.logo-icon{font-size:28px}
.logo h1{font-size:20px;font-weight:700}
.logo-sub{color:var(--text2);font-size:13px}
.tab-nav{display:flex;gap:4px;background:var(--card2);padding:4px;border-radius:8px}
.tab-btn{background:none;border:none;color:var(--text2);padding:8px 16px;border-radius:6px;cursor:pointer;font-size:13px;transition:all .15s}
.tab-btn:hover{color:var(--text)}
.tab-btn.active{background:var(--accent);color:#fff}
main{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:16px;max-width:1440px;margin:0 auto;min-height:calc(100vh - 130px)}
.parts-panel,.build-panel{background:var(--card);border-radius:12px;border:1px solid var(--border);overflow-y:auto;overflow-x:visible;max-height:calc(100vh - 140px)}
.panel-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--card);z-index:2}
.panel-header h2{font-size:15px;font-weight:600}
#partCount{font-size:12px;color:var(--accent);background:rgba(79,140,255,.1);padding:4px 10px;border-radius:20px}
.part-category{border-bottom:1px solid var(--border)}
.cat-header{display:flex;align-items:center;gap:10px;padding:14px 20px;cursor:pointer;transition:background .15s}
.cat-header:hover{background:var(--card2)}
.cat-icon{font-size:18px}
.cat-name{font-weight:600;font-size:14px;flex:1}
.cat-selected{font-size:12px;color:var(--text2);max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.cat-selected.selected{color:var(--green);font-weight:500}
.cat-arrow{font-size:11px;color:var(--text2);transition:transform .2s}
.cat-arrow.open{transform:rotate(180deg)}
.cat-body{display:none;background:var(--card2);border-top:1px solid var(--border)}
.cat-body.open{display:block}
.cat-optional{font-size:11px;color:var(--text2);padding:0 20px 12px}
.cat-count{font-size:11px;color:var(--text2);margin-left:auto;margin-right:8px;background:var(--bg);padding:2px 8px;border-radius:10px}
.part-search{padding:8px 14px;position:sticky;top:0;background:var(--card2);z-index:3;border-bottom:1px solid var(--border)}
.part-search input{width:100%;padding:8px 12px;border-radius:6px;border:1px solid var(--border);background:var(--bg);color:var(--text);font-size:13px;outline:none;transition:border-color .2s}
.part-search input:focus{border-color:var(--accent)}
.part-search input::placeholder{color:var(--text2)}
.btn-sort-perf{background:var(--bg);border:1px solid var(--border);color:var(--text2);padding:6px 10px;border-radius:6px;cursor:pointer;font-size:14px;margin-left:4px;transition:all .15s;white-space:nowrap}
.btn-sort-perf:hover{border-color:var(--accent);color:var(--accent)}
.part-search{display:flex;gap:0}
.part-list{max-height:400px;overflow-y:auto}
.part-missing-link{text-align:center;padding:8px;font-size:11px;color:var(--text2);cursor:pointer;border-top:1px dashed var(--border);transition:color .15s}
.part-missing-link:hover{color:var(--accent)}
.part-none{text-align:center;padding:20px;color:var(--text2);font-size:13px}
.tips-title{font-size:14px;font-weight:600;padding:12px 0 8px;color:var(--accent)}
.tip-item{font-size:12px;color:var(--text2);padding:5px 10px;margin:4px 0;background:var(--card2);border-radius:6px;border-left:3px solid var(--accent)}
.rec-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:12px}
.rec-card{background:var(--card2);border-radius:10px;padding:16px;border:1px solid var(--border);display:flex;flex-direction:column;gap:8px}
.rec-header{font-size:15px;font-weight:700}
.rec-budget{font-size:18px;font-weight:700;color:var(--orange)}
.rec-desc{font-size:12px;color:var(--text2);line-height:1.5}
.rec-parts{display:flex;flex-wrap:wrap;gap:4px}
.rec-part-tag{font-size:10px;background:var(--bg);color:var(--text2);padding:3px 8px;border-radius:4px;white-space:nowrap}
.btn-rec-apply{width:100%;padding:10px;background:var(--accent);color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:13px;font-weight:600;margin-top:auto}
.btn-rec-apply:hover{background:var(--accent2)}
@media(max-width:700px){.rec-grid{grid-template-columns:1fr}}
.learn-grid{display:grid;grid-template-columns:1fr;gap:14px;padding:14px;max-width:800px;margin:0 auto}
.learn-card{background:var(--card2);border-radius:12px;padding:20px;border:1px solid var(--border)}
.learn-icon{font-size:32px;margin-bottom:10px}
.learn-title{font-size:17px;font-weight:700;margin-bottom:8px}
.learn-summary{font-size:14px;color:var(--text);line-height:1.8;margin-bottom:10px}
.learn-full{font-size:14px;color:var(--text2);line-height:2;margin-bottom:10px}
.learn-full p{margin-bottom:10px}
.learn-full b{color:var(--text)}
.learn-tags{display:flex;flex-wrap:wrap;gap:5px;margin-bottom:10px}
.learn-tag{font-size:11px;background:rgba(79,140,255,.15);color:var(--accent);padding:3px 10px;border-radius:4px}
.learn-expand{font-size:13px;color:var(--accent);cursor:pointer;text-align:center;padding:8px 0 0;border-top:1px solid var(--border);margin-top:4px;user-select:none}
.learn-expand:hover{color:#fff}
@media(max-width:700px){.learn-grid{padding:8px}.learn-card{padding:14px}}
.status-bar{display:flex;align-items:center;gap:8px;padding:10px 20px;font-size:13px;font-weight:600;border-bottom:1px solid var(--border)}
.status-dot{width:10px;height:10px;border-radius:50%;display:inline-block}
.status-dot.green{background:var(--green);box-shadow:0 0 8px rgba(52,211,153,.5)}
.status-dot.red{background:var(--red);box-shadow:0 0 8px rgba(248,113,113,.5)}
.status-warn{color:var(--yellow)}
.status-ok{color:var(--green)}
.status-err{color:var(--red)}
.watt-bar-wrap{padding:8px 20px}
.watt-bar{height:8px;background:var(--bg);border-radius:4px;overflow:hidden}
.watt-fill{height:100%;border-radius:4px;transition:width .5s ease}
.watt-ok{background:var(--green)}
.watt-warn{background:var(--yellow)}
.watt-danger{background:var(--red)}
.watt-label{font-size:11px;color:var(--text2);margin-top:4px}
.perf-item{font-size:12px;padding:3px 10px;color:var(--text);background:var(--card2);border-radius:4px;margin:3px 0}
.part-option{display:flex;align-items:center;gap:10px;padding:10px 14px;cursor:pointer;transition:background .1s;border-bottom:1px solid rgba(42,45,58,.5)}
.part-option:hover{background:rgba(79,140,255,.08)}
.part-option.active{background:rgba(79,140,255,.15);border-left:3px solid var(--accent)}
.part-option-img{width:48px;height:36px;border-radius:4px;object-fit:cover;background:var(--card);flex-shrink:0;cursor:zoom-in}
.part-option-preview{display:none;position:fixed;pointer-events:none;z-index:9999;border-radius:10px;box-shadow:0 16px 48px rgba(0,0,0,.7);width:240px;height:180px;object-fit:cover}
.build-item-img{width:72px;height:54px;border-radius:6px;object-fit:cover;background:var(--bg);flex-shrink:0;cursor:zoom-in}
.build-item-preview{display:none;position:fixed;pointer-events:none;z-index:9999;border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.8);width:360px;height:270px;object-fit:cover}

.img-hint{display:inline-flex;align-items:center;gap:4px;font-size:10px;color:var(--text2);padding:2px 6px;background:rgba(79,140,255,.1);border-radius:4px;margin-left:8px;white-space:nowrap}
.img-hint-icon{font-size:12px}
.part-option-name{flex:1;font-size:13px;line-height:1.4}
.part-option-specs{font-size:11px;color:var(--text2);margin-top:2px}
.part-option-price{font-size:13px;font-weight:600;color:var(--orange);white-space:nowrap}
.btn-clear{width:100%;padding:12px;background:none;border:none;color:var(--red);font-size:13px;cursor:pointer;transition:background .15s}
.btn-clear:hover{background:rgba(248,113,113,.08)}
.empty-build{text-align:center;padding:60px 20px}
.empty-icon{font-size:48px;display:block;margin-bottom:12px}
.empty-build p{color:var(--text2);font-size:14px}
.empty-sub{font-size:12px!important;margin-top:6px}
.build-item{display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--border)}
.build-item-img{width:72px;height:54px;border-radius:6px;object-fit:cover;background:var(--bg);flex-shrink:0}
.build-item-icon{font-size:22px;width:40px;text-align:center}
.build-item-info{flex:1}
.build-item-cat{font-size:11px;color:var(--text2)}
.build-item-name{font-size:13px;font-weight:500;margin-top:3px}
.build-item-price{font-size:13px;font-weight:600;color:var(--orange);white-space:nowrap}
.btn-remove{background:none;border:none;color:var(--text2);font-size:16px;cursor:pointer;padding:4px 8px;border-radius:4px;transition:all .15s;line-height:1;flex-shrink:0}
.btn-remove:hover{color:var(--red);background:rgba(248,113,113,.15)}
.btn-upload-img{background:none;border:none;font-size:12px;cursor:pointer;padding:2px 4px;border-radius:3px;opacity:.3;transition:all .15s;flex-shrink:0;line-height:1}
.btn-upload-img:hover{opacity:1;background:rgba(79,140,255,.2)}
.upload-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);z-index:9999;display:flex;align-items:center;justify-content:center}
.upload-card{background:var(--card);border-radius:12px;padding:24px;max-width:380px;width:90%;text-align:center}
.upload-title{font-size:20px;font-weight:700;margin-bottom:8px}
.upload-item-name{font-size:13px;color:var(--text2);padding:4px 12px;background:var(--bg);border-radius:4px;display:inline-block}
.upload-email{font-size:18px;font-weight:700;color:var(--accent);margin:12px 0;padding:8px 16px;background:var(--bg);border-radius:8px;user-select:all}
.btn-share{background:var(--accent);color:#fff;border:none;padding:8px 16px;border-radius:6px;font-size:12px;cursor:pointer;font-weight:500}
.btn-share:hover{background:var(--accent2)}
.total-price{position:sticky;bottom:0;background:var(--card);border-top:1px solid var(--border);padding:16px 20px;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.price-label{font-size:13px;color:var(--text2)}
.price-value{font-size:24px;font-weight:700;color:var(--orange)}
.price-note{font-size:11px;color:var(--text2);width:100%}
.compat-log{padding:0 20px}
.compat-item{display:flex;align-items:center;gap:8px;padding:10px 14px;margin:6px 0;border-radius:8px;font-size:13px}
.compat-ok{background:rgba(52,211,153,.1);color:var(--green)}
.compat-warn{background:rgba(251,191,36,.1);color:var(--yellow)}
.compat-err{background:rgba(248,113,113,.1);color:var(--red)}
footer{background:var(--card);border-top:1px solid var(--border);padding:24px;margin-top: auto}
.footer-main{display:flex;gap:32px;max-width:900px;margin:0 auto;flex-wrap:wrap}
.footer-col{flex:1;min-width:220px}
.footer-col h4{font-size:14px;margin-bottom:8px}
.footer-col p{font-size:12px;color:var(--text2);line-height:1.6;margin:0}
.footer-email{display:inline-block;margin-top:8px;font-size:14px;color:var(--text);font-weight:500}
#pwa-banner{display:flex;position:fixed;bottom:16px;left:50%;transform:translateX(-50%);background:var(--accent);color:#fff;padding:10px 16px;border-radius:10px;z-index:999;align-items:center;gap:10px;cursor:pointer;box-shadow:0 4px 20px rgba(0,0,0,.4);font-size:12px;line-height:1.5;max-width:90vw}
#pwa-banner .pwa-close{position:absolute;top:-6px;right:-6px;width:20px;height:20px;background:var(--red);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:10px;cursor:pointer}
#pwa-banner .pwa-icon{font-size:28px}
@media(min-width:768px){#pwa-banner{display:none!important}}
@media(max-width:900px){main{grid-template-columns:1fr}.parts-panel,.build-panel{max-height:none}}

.hover-card{display:none;position:fixed;pointer-events:none;z-index:9999;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;box-shadow:0 16px 48px rgba(0,0,0,.7);width:400px;max-height:580px;overflow-y:auto;overflow-x:hidden}
.hover-card-img{width:100%;height:180px;object-fit:cover;border-radius:8px;margin-bottom:10px;background:var(--bg)}
.hover-card-title{font-size:14px;font-weight:600;margin-bottom:8px;line-height:1.4}
.hover-card-specs{font-size:12px;color:var(--text2);margin-bottom:8px;line-height:1.6}
.hover-card-tier{font-size:12px;color:var(--accent);margin-bottom:4px}
.hover-card-price{font-size:18px;font-weight:700;color:var(--orange)}
.hover-card-year{font-size:13px;color:var(--text2);margin-bottom:4px}
.hover-card-divider{height:1px;background:var(--border);margin:8px 0}