.bk3{--blue:#2E5BFF;--blue-deep:#1E4FD8;--blue-bright:#4D7CFF;--blue-dark:#12308F;
--ink:#232A3B;--dim:#7A8399;--line:#E6EAF5;--card:#FFFFFF;--paper:#F6F8FE;--gold:#C9A227}.bk3 *{margin:0;padding:0;box-sizing:border-box}.bk3{font-family:"Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:var(--paper);line-height:1.75}.bk3 a{text-decoration:none}.bk3 .container{max-width:1080px;margin:0 auto;padding:0 24px}.bk3 /* 吸顶导航 */
.nav{position:sticky;top:var(--hub-top-h,0);z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);
border-bottom:1px solid var(--line)}.bk3 .nav .container{display:flex;align-items:center;gap:6px;height:58px;overflow-x:auto;white-space:nowrap}.bk3 .nav .brand{font-weight:800;color:var(--blue-deep);margin-right:16px;font-size:16px;letter-spacing:1px}.bk3 .nav a{padding:6px 13px;border-radius:16px;color:var(--dim);font-size:14px;transition:.2s}.bk3 .nav a:hover{color:var(--blue);background:#EEF3FF}.bk3 .nav a.active{color:#fff;background:var(--blue)}.bk3 /* Hero */
.hero{background:linear-gradient(130deg,var(--blue-deep) 0%,var(--blue) 55%,var(--blue-bright) 100%);
color:#fff;padding:72px 0 64px;position:relative;overflow:hidden}.bk3 .hero::before, .bk3 .hero::after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.07)}.bk3 .hero::before{width:340px;height:340px;top:-120px;right:-80px}.bk3 .hero::after{width:220px;height:220px;bottom:-90px;left:-50px}.bk3 .hero .tag{display:inline-block;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.35);
padding:4px 14px;border-radius:14px;font-size:13px;margin-bottom:18px;letter-spacing:2px}.bk3 .hero h1{font-size:42px;font-weight:800;letter-spacing:2px;margin-bottom:10px}.bk3 .hero .sub{font-size:16px;opacity:.9;margin-bottom:26px}.bk3 .hero .meta{display:flex;gap:14px;flex-wrap:wrap}.bk3 .hero .meta span{background:rgba(255,255,255,.12);border-radius:10px;padding:6px 14px;font-size:13px}.bk3 /* 章节 */
section{padding:52px 0 8px;scroll-margin-top:70px}.bk3 .sec-head{display:flex;align-items:center;gap:14px;margin-bottom:10px}.bk3 .sec-num{width:42px;height:42px;border-radius:50%;background:var(--blue);color:#fff;font-size:18px;
font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0}.bk3 .sec-head h2{font-size:26px;font-weight:800;letter-spacing:1px}.bk3 .sec-head .en{color:var(--dim);font-size:12px;letter-spacing:2px;text-transform:uppercase;margin-top:2px}.bk3 .sec-desc{color:var(--dim);font-size:14px;margin:0 0 26px 56px;max-width:900px}.bk3 /* 卡片 */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:18px;margin-bottom:34px}.bk3 .card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;transition:.25s}.bk3 .card:hover{transform:translateY(-3px);box-shadow:0 10px 28px rgba(46,91,255,.1)}.bk3 .card h3{color:var(--blue-deep);font-size:17px;margin-bottom:10px}.bk3 .card .badge{display:inline-block;background:#EEF3FF;color:var(--blue-deep);font-size:12px;
padding:2px 10px;border-radius:10px;margin-bottom:10px;font-weight:600}.bk3 .card p{color:var(--dim);font-size:13.5px}.bk3 .card b{color:var(--ink)}.bk3 /* 数字条 */
.statbar{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin-bottom:34px}.bk3 .stat{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;text-align:center}.bk3 .stat .num{font-size:30px;font-weight:800;color:var(--blue-deep);font-family:Consolas,monospace}.bk3 .stat .lbl{color:var(--dim);font-size:12.5px;margin-top:4px}.bk3 /* 表格 */
.table-wrap{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-bottom:18px}.bk3 table{width:100%;border-collapse:collapse;font-size:13.5px}.bk3 th{background:var(--blue);color:#fff;padding:10px 12px;text-align:left;font-weight:600;white-space:nowrap}.bk3 td{padding:9px 12px;border-bottom:1px solid var(--line);color:#3A4358}.bk3 tr:nth-child(even) td{background:#FAFBFE}.bk3 /* 展开 */
details{margin-bottom:22px;background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}.bk3 details summary{cursor:pointer;padding:13px 18px;font-weight:700;color:var(--blue-deep);list-style:none;
display:flex;align-items:center;gap:8px;font-size:14.5px}.bk3 details summary::before{content:"\25B8";transition:transform .2s;color:var(--blue)}.bk3 details[open] summary::before{transform:rotate(90deg)}.bk3 details summary:hover{background:#EEF3FF}.bk3 details .body{padding:6px 18px 18px;font-size:13.5px;color:#3A4358}.bk3 details .body p{margin:8px 0}.bk3 /* 弹窗 */
.modal-mask{position:fixed;inset:0;background:rgba(30,50,120,.5);backdrop-filter:blur(3px);
display:none;align-items:center;justify-content:center;z-index:999}.bk3 .modal-mask.show{display:flex}.bk3 .modal{background:#fff;border-radius:18px;width:min(420px,90vw);padding:30px 28px;text-align:center;
box-shadow:0 20px 60px rgba(0,0,0,.3);position:relative;animation:pop .3s ease}@keyframes bk3-pop{from{transform:scale(.9);opacity:0}to{transform:scale(1);opacity:1}}.bk3 .modal .close{position:absolute;top:12px;right:16px;font-size:22px;color:#B9B7B0;cursor:pointer}.bk3 .modal .close:hover{color:var(--blue)}.bk3 .modal h3{color:var(--blue-deep);font-size:20px;margin-bottom:6px}.bk3 .modal p{color:var(--dim);font-size:13px;margin-bottom:16px}.bk3 .modal .qr{border:2px dashed var(--line);border-radius:12px;padding:12px;display:inline-block;background:#F6F8FE}.bk3 .modal .qr img{width:180px;height:180px;display:block}.bk3 .modal .tip{color:var(--blue-deep);font-weight:600;font-size:14px;margin-top:14px}.bk3 .modal .btn{display:inline-block;margin-top:8px;background:var(--blue);color:#fff;padding:8px 26px;
border-radius:20px;font-size:13px;cursor:pointer;border:none}.bk3 .modal .btn:hover{background:var(--blue-deep)}.bk3 .fab{position:fixed;right:24px;bottom:30px;background:linear-gradient(135deg,var(--red) 0%,var(--red-deep) 100%);color:#fff;border-radius:30px;padding:14px 22px;display:flex;align-items:center;gap:8px;font-size:15px;font-weight:700;letter-spacing:1px;cursor:pointer;z-index:90;border:none;box-shadow:0 8px 24px rgba(46,91,255,.45);animation:bk3-fabPulse 2.2s infinite;font-family:inherit}.bk3 .fab:hover{transform:scale(1.06);box-shadow:0 10px 30px rgba(46,91,255,.6}@keyframes bk3-fabPulse{0%,100%{box-shadow:0 8px 24px rgba(46,91,255,.4}50%{box-shadow:0 10px 36px rgba(46,91,255,.75}}.bk3 footer{background:var(--blue-dark);color:rgba(255,255,255,.75);padding:26px 0;margin-top:60px;font-size:13px;text-align:center}.bk3 /* 标准华图页脚 */
.footer{background:#2F3437;color:#B9B7B0;text-align:center;padding:24px 16px;font-size:12.5px;line-height:2}.bk3 .footer a{color:#B9B7B0;text-decoration:none;margin:0 2px}.bk3 .footer a:hover{color:#fff}@media(max-width:768px){.bk3 .footer{padding:18px 10px;font-size:11.5px;line-height:2.1}}