*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#141820;--surface:#1c2230;--line:#2a3344;
  --orange:#ff8800;--orange-dim:#cc6d00;--blue:#3884ff;
  --text:#e8ecf4;--muted:#8892a8;
  --display:"Space Grotesk","Noto Sans SC",system-ui,sans-serif;
  --body:"JetBrains Mono","Noto Sans SC",monospace;
  --max:1140px;--pad:clamp(18px,4vw,36px);--section:clamp(56px,7vw,88px)
}
html{scroll-behavior:smooth}
body{font-family:var(--body);background:var(--bg);color:var(--text);line-height:1.7;overflow-x:hidden;font-size:14px}
a{color:var(--blue);text-decoration:none}
img{display:block;max-width:100%;border-radius:8px}

.engine-header{position:sticky;top:0;z-index:200;background:var(--surface);border-bottom:2px solid var(--orange)}
.engine-header .inner{max-width:var(--max);margin:0 auto;padding:0 var(--pad);height:60px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--display);font-weight:700;font-size:.92rem;color:var(--text);text-decoration:none}
.brand img{width:26px;height:26px}
.hdr-nav{display:flex;gap:4px}
.hdr-nav a{padding:7px 14px;color:var(--muted);font-size:.78rem;font-weight:600;text-decoration:none;border-radius:4px;transition:.2s}
.hdr-nav a:hover{color:var(--text);background:rgba(255,255,255,.06)}
.hdr-nav a.on{color:var(--bg);background:var(--orange)}
.hdr-dl{padding:8px 18px;background:var(--orange);color:var(--bg);font-size:.78rem;font-weight:700;text-decoration:none;border-radius:4px;white-space:nowrap}
.hdr-dl:hover{background:var(--orange-dim)}

/* ── Download hero CTA ── */
.dl-cta-bar{
  max-width:var(--max);margin:0 auto;padding:0 var(--pad) 32px;
  display:flex;flex-wrap:wrap;align-items:center;gap:16px
}
.dl-cta-bar .ver-badge{
  font-family:var(--mono);font-size:.72rem;color:var(--orange);
  background:rgba(255,136,0,.12);padding:6px 12px;border-radius:4px;border:1px solid rgba(255,136,0,.3)
}
.btn-xl{
  padding:16px 32px;font-size:.95rem;font-weight:700;border-radius:8px;
  text-decoration:none;display:inline-flex;align-items:center;gap:8px;
  box-shadow:0 4px 20px rgba(255,136,0,.35);transition:.2s
}
.btn-xl.btn-amber{background:var(--orange);color:var(--bg)}
.btn-xl.btn-amber:hover{background:var(--orange-dim);transform:translateY(-1px);box-shadow:0 6px 24px rgba(255,136,0,.45)}
.dl-cta-note{font-size:.78rem;color:var(--muted);font-family:"Noto Sans SC",sans-serif;max-width:320px;line-height:1.5}

.dl-section-head{margin-bottom:20px}
.dl-section-head h2{font-family:var(--display);font-size:1.3rem;margin-bottom:6px}
.dl-section-head p{font-size:.82rem;color:var(--muted);font-family:"Noto Sans SC",sans-serif}

.dl-card{position:relative}
.dl-card.rec{border-color:var(--orange);box-shadow:0 0 0 1px var(--orange)}
.dl-card .rec-tag{
  position:absolute;top:-10px;left:50%;transform:translateX(-50%);
  background:var(--orange);color:var(--bg);font-size:.62rem;font-weight:700;
  padding:3px 10px;border-radius:10px;white-space:nowrap
}
.dl-card .plat{
  font-family:var(--display);font-size:.68rem;font-weight:700;color:var(--blue);
  background:rgba(56,132,255,.12);display:inline-block;padding:4px 10px;border-radius:4px;margin-bottom:8px
}
.dl-card a.official-link{font-size:.72rem;color:var(--blue);margin-top:8px;display:inline-block}

.blueprint-hero{padding:clamp(48px,7vw,80px) var(--pad);background:linear-gradient(160deg,#1a2030 0%,#141820 60%)}
.blueprint-hero .wrap{max-width:var(--max);margin:0 auto;display:grid;grid-template-columns:1fr 1.05fr;gap:32px;align-items:center}
.hero-tag{font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--orange);margin-bottom:12px}
.blueprint-hero h1{font-family:var(--display);font-size:clamp(2rem,4.5vw,3rem);font-weight:700;line-height:1.08;margin-bottom:16px}
.lead{color:var(--muted);font-size:.92rem;max-width:480px;margin-bottom:24px;font-family:"Noto Sans SC",sans-serif}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{padding:12px 24px;font-size:.82rem;font-weight:700;border-radius:6px;text-decoration:none;display:inline-block;transition:.2s}
.btn-amber{background:var(--orange);color:var(--bg)}
.btn-amber:hover{background:var(--orange-dim)}
.hero-btns .btn-xl{padding:16px 28px;font-size:.92rem;box-shadow:0 4px 20px rgba(255,136,0,.3)}
.hero-btns .btn-xl:hover{transform:translateY(-1px);box-shadow:0 6px 24px rgba(255,136,0,.4)}
.hero-visual{position:relative}
.hero-visual img{border:1px solid var(--line);box-shadow:0 24px 60px rgba(0,0,0,.5);cursor:pointer}
.meter-ring{position:absolute;bottom:-20px;right:-10px;width:100px;height:100px;border-radius:50%;background:var(--surface);border:3px solid var(--orange);display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(0,0,0,.4)}
.meter-ring .val{font-family:var(--display);font-size:1.4rem;font-weight:700;color:var(--orange)}
.meter-ring .lbl{font-size:.6rem;color:var(--muted);text-align:center}

.spec-dock{overflow:hidden;background:var(--surface);border-block:1px solid var(--line);padding:14px 0}
.spec-dock .track{display:flex;gap:40px;animation:scroll-dock 28s linear infinite;width:max-content}
.spec-item{display:flex;flex-direction:column;gap:2px;min-width:140px}
.spec-item b{font-family:var(--display);color:var(--orange);font-size:.88rem}
.spec-item span{font-size:.72rem;color:var(--muted)}
@keyframes scroll-dock{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}

.section{max-width:var(--max);margin:0 auto;padding:var(--section) var(--pad)}
.section-tag{font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:8px}
.section h2{font-family:var(--display);font-size:clamp(1.5rem,3vw,2rem);font-weight:700;margin-bottom:10px}
.section .sub{color:var(--muted);font-size:.88rem;margin-bottom:32px;max-width:560px;font-family:"Noto Sans SC",sans-serif}

.engine-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.engine-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:24px;transition:.25s}
.engine-card:hover{border-color:var(--orange);transform:translateY(-2px)}
.engine-card .ico{font-family:var(--display);font-size:.72rem;font-weight:700;color:var(--orange);background:rgba(255,136,0,.12);display:inline-block;padding:4px 10px;border-radius:4px;margin-bottom:12px}
.engine-card h3{font-family:var(--display);font-size:1rem;margin-bottom:8px}
.engine-card p{color:var(--muted);font-size:.82rem;font-family:"Noto Sans SC",sans-serif;line-height:1.65}

.split-wrap{display:grid;grid-template-columns:180px 1fr;gap:32px;align-items:start}
.step-rail{position:sticky;top:80px;display:flex;flex-direction:column;gap:4px}
.step-rail .step{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:6px;color:var(--muted);font-size:.82rem;text-decoration:none;transition:.2s}
.step-rail .step .n{width:24px;height:24px;border-radius:50%;background:var(--line);display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:700}
.step-rail .step.active,.step-rail .step:hover{color:var(--text);background:rgba(255,136,0,.1)}
.step-rail .step.active .n,.step-rail .step:hover .n{background:var(--orange);color:var(--bg)}
.step-block{margin-bottom:48px;padding-bottom:48px;border-bottom:1px solid var(--line)}
.step-block:last-child{border:none;margin:0;padding:0}
.step-block h2{font-family:var(--display);font-size:1.4rem;margin-bottom:12px}
.step-block p{color:var(--muted);font-size:.88rem;margin-bottom:16px;font-family:"Noto Sans SC",sans-serif}
.step-block img{margin-top:16px;cursor:pointer;border:1px solid var(--line)}

.news-list{display:flex;flex-direction:column;gap:12px}
.news-row{display:grid;grid-template-columns:100px 1fr;gap:20px;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:10px;text-decoration:none;color:inherit;transition:.2s}
.news-row:hover{border-color:var(--orange)}
.news-row time{font-size:.78rem;color:var(--orange);font-weight:600}
.news-row h3{font-family:var(--display);font-size:.95rem;margin-bottom:4px}
.news-row p{font-size:.82rem;color:var(--muted);font-family:"Noto Sans SC",sans-serif}

.faq-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.faq-box{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:20px}
.faq-box h4{font-family:var(--display);font-size:.88rem;margin-bottom:8px;color:var(--orange)}
.faq-box p{font-size:.82rem;color:var(--muted);font-family:"Noto Sans SC",sans-serif}

.site-foot{max-width:var(--max);margin:0 auto;padding:32px var(--pad);border-top:1px solid var(--line);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.78rem;color:var(--muted)}
.site-foot a{color:var(--blue)}
.friend-links{width:100%;margin-top:8px;font-size:.72rem}

.page-hero{padding:48px var(--pad) 32px;max-width:var(--max);margin:0 auto}
.page-hero h1{font-family:var(--display);font-size:clamp(1.8rem,3.5vw,2.4rem);margin-bottom:12px}
.page-hero p{color:var(--muted);font-family:"Noto Sans SC",sans-serif;max-width:600px}
.crumb{font-size:.72rem;color:var(--muted);padding:16px var(--pad) 0;max-width:var(--max);margin:0 auto}
.crumb a{color:var(--blue)}

.dl-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:32px}
.dl-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:28px;text-align:center}
.dl-card h3{font-family:var(--display);margin:12px 0 8px}
.dl-card p{font-size:.82rem;color:var(--muted);margin-bottom:16px;font-family:"Noto Sans SC",sans-serif}
.dl-card .btn{width:100%;text-align:center}

.prose{max-width:720px;font-family:"Noto Sans SC",sans-serif}
.prose h2{font-family:var(--display);font-size:1.2rem;margin:32px 0 12px;color:var(--orange)}
.prose p{color:var(--muted);margin-bottom:14px;font-size:.9rem}
.prose code{background:rgba(255,136,0,.12);padding:2px 6px;border-radius:3px;font-size:.85rem;color:var(--orange)}
.prose ul,.prose ol{color:var(--muted);font-size:.9rem;margin:0 0 14px 20px;font-family:"Noto Sans SC",sans-serif}
.prose li{margin-bottom:6px}

.dl-hero{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:center;padding-bottom:32px}
.dl-hero img{border:1px solid var(--line);cursor:pointer;box-shadow:0 16px 40px rgba(0,0,0,.4)}
.dl-card .ver{font-family:var(--mono);font-size:.72rem;color:var(--orange);margin-bottom:4px}
.dl-card .size{font-size:.72rem;color:var(--muted);margin-bottom:12px}
.dl-card .hint{font-size:.78rem;color:var(--muted);margin-top:10px;line-height:1.5;font-family:"Noto Sans SC",sans-serif}

.ver-pick{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:24px 0}
.ver-pick-box{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:20px}
.ver-pick-box.rec{border-color:var(--orange)}
.ver-pick-box h4{font-family:var(--display);font-size:.9rem;margin-bottom:8px;color:var(--orange)}
.ver-pick-box p{font-size:.82rem;color:var(--muted);font-family:"Noto Sans SC",sans-serif;line-height:1.65}

.pitfall{background:rgba(255,136,0,.08);border:1px solid rgba(255,136,0,.25);border-radius:10px;padding:18px 20px;margin:20px 0}
.pitfall h4{font-family:var(--display);font-size:.88rem;color:var(--orange);margin-bottom:8px}
.pitfall p{font-size:.84rem;color:var(--muted);font-family:"Noto Sans SC",sans-serif;line-height:1.65;margin-bottom:8px}
.pitfall p:last-child{margin-bottom:0}

@media(max-width:860px){.dl-hero,.ver-pick{grid-template-columns:1fr}}

/* ── Download: terminal banner + matrix table (unique to engine lab) ── */
.term-banner{
  max-width:var(--max);margin:0 auto;padding:0 var(--pad) 28px
}
.term-panel{
  background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden;
  box-shadow:0 16px 48px rgba(0,0,0,.45)
}
.term-bar{
  background:var(--dark2);padding:10px 16px;display:flex;align-items:center;gap:8px;
  border-bottom:1px solid var(--line);font-size:.72rem;color:var(--muted)
}
.term-dot{width:10px;height:10px;border-radius:50%}
.term-body{padding:20px 24px 24px;font-family:var(--body)}
.term-body .prompt{color:var(--orange);margin-bottom:12px;font-size:.82rem}
.term-body .cmd{color:#a8d4ff;margin-bottom:6px;font-size:.85rem;word-break:break-all}
.term-dl-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px;align-items:center}
.term-dl-row .btn-xl{margin:0}

.dl-matrix{width:100%;border-collapse:collapse;font-size:.82rem;margin-top:8px}
.dl-matrix th,.dl-matrix td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.dl-matrix th{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--orange);background:rgba(255,136,0,.06)}
.dl-matrix td{color:var(--muted);font-family:"Noto Sans SC",sans-serif}
.dl-matrix .fname{font-family:var(--mono);color:#c8d4e8;font-size:.78rem}
.dl-matrix .rec-row td{background:rgba(255,136,0,.05)}
.dl-matrix a.dl-link{color:var(--orange);font-weight:700;font-family:var(--mono);font-size:.78rem;white-space:nowrap}
.dl-matrix-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:10px;margin-top:16px}

.deploy-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}
.deploy-box{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:18px}
.deploy-box h4{font-family:var(--display);font-size:.85rem;color:var(--blue);margin-bottom:8px}
.deploy-box p{font-size:.8rem;color:var(--muted);font-family:"Noto Sans SC",sans-serif;line-height:1.6}
@media(max-width:760px){.deploy-grid{grid-template-columns:1fr}}

.news-timeline{max-width:var(--max);margin:0 auto;padding:0 var(--pad) var(--section)}
.news-tl{padding:32px 0;border-bottom:1px solid var(--line)}
.news-tl time{display:block;font-size:.78rem;color:var(--orange);font-weight:600;margin-bottom:8px}
.news-tl h3{font-family:var(--display);font-size:1.15rem;margin-bottom:12px}
.news-tl p{color:var(--muted);font-size:.88rem;margin-bottom:12px;font-family:"Noto Sans SC",sans-serif;line-height:1.75}
.news-tl img{margin-top:16px;cursor:pointer;border:1px solid var(--line)}

.modal{position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:999;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:.3s}
.modal.open{opacity:1;pointer-events:auto}
.modal img{max-width:92vw;max-height:88vh;border-radius:8px}
.modal-close{position:absolute;top:20px;right:24px;background:none;border:none;color:#fff;font-size:1.4rem;cursor:pointer}

@media(max-width:860px){
  .blueprint-hero .wrap,.split-wrap{grid-template-columns:1fr}
  .step-rail{position:static;flex-direction:row;overflow-x:auto}
  .news-row{grid-template-columns:1fr}
}