/* Round 4: Galaxy Frontier, AI exploration page, shared return action and canonical ASTRON artwork. */
.pv-back{display:inline-flex!important;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:11px 22px!important;border:0!important;border-radius:11px;background:#1246A0!important;color:#fff!important;font-family:'Noto Sans SC',-apple-system,'PingFang SC',sans-serif!important;font-size:13px!important;font-weight:700!important;letter-spacing:.03em!important;line-height:1.4;text-decoration:none;white-space:nowrap;box-shadow:0 4px 12px rgba(18,70,160,.16);transition:background .2s,box-shadow .2s,transform .2s!important}
.pv-back:hover{background:#E8862E!important;color:#fff!important;box-shadow:0 8px 20px rgba(232,134,46,.28);transform:translateY(-1px)}.pv-back:active{transform:translateY(0);box-shadow:0 3px 8px rgba(232,134,46,.2)}.pv-back:focus-visible{outline:3px solid rgba(232,134,46,.36);outline-offset:3px}
.brand-logo,.pv-brand img,.foot-logos .foot-astron{width:auto;object-fit:contain}.book>img{width:150px;height:auto;object-fit:contain}.orbit-center::before{background-image:url('assets/astron-brand-white.png')!important}
/* Wide third Galaxy track */
.frontier-card{position:relative;isolation:isolate;overflow:hidden;margin-top:26px;padding:30px 32px;display:grid;grid-template-columns:minmax(0,1.35fr) minmax(260px,.65fr);gap:30px;align-items:center;background:#fff;border:1px solid rgba(136,177,229,.5);border-radius:18px;color:#102b4e;box-shadow:0 16px 38px rgba(3,19,46,.14)}
.frontier-card:before{content:'';position:absolute;inset:0 0 auto;height:4px;background:#2868d8}.frontier-kicker{font-size:10px;font-weight:700;letter-spacing:.18em;color:#2868d8}.frontier-card h4{margin:10px 0 10px;font-family:'Noto Serif SC','Songti SC',serif;font-size:22px;line-height:1.5;color:#102b4e}.frontier-card p{max-width:700px;margin:0;color:#536780;font-size:13px;line-height:1.9}.frontier-meta{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-top:20px}.frontier-status{display:inline-flex;align-items:center;gap:7px;color:#245cb5;background:#edf4ff;padding:7px 11px;border-radius:100px;font-size:11px;font-weight:700}.frontier-status:before{content:'';width:6px;height:6px;border-radius:50%;background:#2868d8}.frontier-link{display:inline-flex;align-items:center;gap:9px;color:#d97525;font-size:13px;font-weight:700;text-decoration:none}.frontier-link:hover{text-decoration:underline}.frontier-orbit{width:100%;height:auto;display:block;min-height:110px}.frontier-foot{margin-top:18px;color:#a9c0de;font-size:12px;line-height:1.8}
/* AI exploration secondary page */
#fview{position:fixed;inset:0;z-index:170;display:none;background:#fff;overflow-y:auto;overscroll-behavior:contain}#fview.open{display:block}.front-page{background:#fff;color:#14253d;font-family:'Noto Sans SC',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif}.front-hero{position:relative;isolation:isolate;overflow:hidden;background:#061b3b;color:#fff}.front-hero:before{content:'';position:absolute;inset:0;z-index:-1;background:radial-gradient(circle at 82% 40%,rgba(29,111,214,.28),transparent 38%),linear-gradient(110deg,#061b3b 25%,#0a2f61 75%)}.front-hero-in{width:min(1180px,90vw);margin:auto;padding:72px 0 64px;display:grid;grid-template-columns:1.2fr .8fr;gap:44px;align-items:center}.front-eyebrow{font-size:11px;letter-spacing:.2em;color:#8eb9ee;font-weight:600}.front-label{display:inline-flex;margin:22px 0 16px;padding:7px 12px;border:1px solid rgba(255,175,103,.65);border-radius:100px;background:rgba(232,134,46,.12);color:#ffd0a2;font-size:11px;font-weight:700}.front-hero h1{margin:0;font-family:'Noto Serif SC','Songti SC',serif;font-size:clamp(31px,4vw,49px);line-height:1.32;letter-spacing:-.02em}.front-hero h1 span{color:#f1a25e}.front-subtitle{margin:18px 0 0;color:#fff;font-size:18px;line-height:1.8;font-weight:600}.front-desc{margin:16px 0 0;max-width:700px;color:#b7cce5;font-size:13px;line-height:1.95}.front-hero-art{width:100%;height:auto;display:block}.front-body{width:min(1180px,90vw);margin:auto}.front-section{padding:62px 0;border-bottom:1px solid #e2eaf3}.front-section.mist{width:100%;background:#f4f7fb}.front-section.mist>.front-body{width:min(1180px,90vw)}.front-section-head{display:flex;align-items:baseline;gap:16px;margin-bottom:28px}.front-no{font:800 13px/1 Arial,sans-serif;color:#e8862e;letter-spacing:.1em}.front-section h2{margin:0;font-family:'Noto Serif SC','Songti SC',serif;font-size:27px;line-height:1.45;color:#102b4e}.front-section-note{margin-left:auto;max-width:460px;color:#7a899c;font-size:11px;line-height:1.8}.front-example-note{margin:-10px 0 24px;color:#65758a;font-size:12px;line-height:1.8}.front-flow{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:18px}.front-step{position:relative;min-width:0;padding:23px 19px;background:#fff;border:1px solid #d8e3f0;border-radius:12px;box-shadow:0 8px 20px rgba(22,67,124,.05)}.front-step:not(:last-child):after{content:'→';position:absolute;right:-18px;top:38px;width:18px;text-align:center;color:#2b75ca;font-size:18px;font-weight:700}.front-step-no{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:50%;background:#1264c0;color:#fff;font:700 13px/1 Arial,sans-serif}.front-step h3{margin:15px 0 11px;font-family:'Noto Sans SC',sans-serif;font-size:15px;line-height:1.6;color:#153a68}.front-step p{margin:0;color:#5c6e84;font-size:12px;line-height:1.9}.front-step ul{margin:12px 0 0;padding:12px 0 0;border-top:1px solid #e5ecf4;list-style:none;display:grid;gap:6px}.front-step li{position:relative;padding-left:12px;color:#3e5875;font-size:11px;line-height:1.65}.front-step li:before{content:'';position:absolute;left:0;top:.65em;width:4px;height:4px;border-radius:50%;background:#2b75ca}.front-cap-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.front-cap{padding:25px 22px;border-top:3px solid #2868d8;background:#fff;box-shadow:0 8px 20px rgba(22,67,124,.04)}.front-cap:nth-child(2){border-top-color:#e8862e}.front-cap:nth-child(3){border-top-color:#168e81}.front-cap:nth-child(4){border-top-color:#6f63c6}.front-cap svg{width:30px;height:30px;fill:none;stroke:#2868d8;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.front-cap h3{margin:16px 0 9px;font-family:'Noto Sans SC',sans-serif;font-size:17px}.front-cap p{margin:0;color:#5c6e84;font-size:12px;line-height:1.9}.front-roles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid #d9e3ef;border-left:1px solid #d9e3ef}.front-role{padding:25px;border-right:1px solid #d9e3ef;border-bottom:1px solid #d9e3ef}.front-role small{color:#e8862e;font-size:10px;font-weight:700;letter-spacing:.12em}.front-role h3{margin:10px 0;font-family:'Noto Sans SC',sans-serif;font-size:16px}.front-role p{margin:0;color:#5c6e84;font-size:12px;line-height:1.9}.front-boundaries{display:grid;grid-template-columns:1fr 1fr;gap:0 36px}.front-boundary{padding:21px 0;border-bottom:1px solid #dce5ef}.front-boundary h3{margin:0 0 8px;font-family:'Noto Sans SC',sans-serif;font-size:15px;color:#173e70}.front-boundary p{margin:0;color:#5c6e84;font-size:12px;line-height:1.9}.front-cta{margin:54px 0 80px;padding:34px 36px;background:#0b3670;color:#fff;display:flex;align-items:center;justify-content:space-between;gap:30px}.front-cta h2{font-family:'Noto Sans SC',sans-serif;font-size:22px;color:#fff}.front-cta p{margin:9px 0 0;max-width:760px;color:#c2d5eb;font-size:12px;line-height:1.9}.front-cta a{flex:none;display:inline-flex;padding:13px 21px;border-radius:9px;background:#fff;color:#1246a0;font-size:13px;font-weight:700;text-decoration:none}.front-cta a:hover{background:#fff0e3;color:#c66b1c}.front-fine{margin:18px 0 0;color:#8190a3;font-size:11px;line-height:1.8}
@media(max-width:1050px){.front-flow{grid-template-columns:repeat(3,minmax(0,1fr))}.front-step:not(:last-child):after{display:none}.front-cap-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.front-roles{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.pv-back{min-height:42px;padding:10px 15px!important;font-size:12px!important;border-radius:9px}.frontier-card{grid-template-columns:1fr;padding:25px 22px;gap:14px}.frontier-card h4{font-size:20px}.frontier-orbit{max-height:115px}.front-hero-in{grid-template-columns:1fr;padding:46px 0 40px;gap:22px}.front-hero h1{font-size:30px}.front-subtitle{font-size:16px}.front-hero-art{max-height:180px}.front-section{padding:42px 0}.front-section-head{display:grid;grid-template-columns:34px 1fr;gap:8px;margin-bottom:22px}.front-section h2{font-size:22px}.front-section-note{grid-column:2;margin-left:0}.front-flow{grid-template-columns:1fr;gap:14px}.front-step:not(:last-child):after{display:block;content:'↓';right:50%;top:auto;bottom:-22px;transform:translateX(50%);z-index:2}.front-cap-grid,.front-roles,.front-boundaries{grid-template-columns:1fr}.front-cta{margin:38px 0 55px;padding:27px 24px;align-items:flex-start;flex-direction:column}.front-cta h2{font-size:20px}}
@media(max-width:390px){#fview .pv-brand .s,#cview .pv-brand .s{display:none}.front-hero h1{font-size:26px}.frontier-meta{align-items:flex-start;flex-direction:column;gap:12px}}