*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --navy:#1b3a5f;--navy-d:#122840;--amber:#f0a020;--amber-d:#d4880a;
  --blue:#2d78c8;--bg:#f3f6fa;--card:#fff;--text:#1a2332;--muted:#5a6578;
  --line:#dde3ec;--serif:'Noto Serif SC',Georgia,serif;
  --sans:'IBM Plex Sans','Segoe UI',sans-serif;--mono:'IBM Plex Mono',Consolas,monospace;
  --hdr:64px;--radius:12px;--shadow:0 8px 32px rgba(27,58,95,.08);
}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--text);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}

/* Header */
.archive-header{position:sticky;top:0;z-index:200;background:var(--navy-d);border-bottom:2px solid var(--amber);box-shadow:0 4px 20px rgba(0,0,0,.25)}
.archive-header .inner{max-width:1180px;margin:0 auto;padding:0 20px;height:var(--hdr);display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.05rem;text-decoration:none;white-space:nowrap}
.brand img{border-radius:6px}
.hdr-nav{display:flex;gap:6px;margin-left:auto}
.hdr-nav a{color:rgba(255,255,255,.75);padding:8px 14px;border-radius:8px;font-size:.9rem;font-weight:500;text-decoration:none;transition:.2s}
.hdr-nav a:hover,.hdr-nav a.on{color:#fff;background:rgba(255,255,255,.1);text-decoration:none}
.hdr-dl{margin-left:8px;padding:10px 22px;background:var(--amber);color:var(--navy-d);font-weight:700;font-size:.92rem;border-radius:8px;text-decoration:none;white-space:nowrap;animation:pulse-dl 2.5s ease infinite;box-shadow:0 0 0 0 rgba(240,160,32,.5)}
.hdr-dl:hover{background:#ffc040;text-decoration:none;transform:translateY(-1px)}
@keyframes pulse-dl{0%,100%{box-shadow:0 0 0 0 rgba(240,160,32,.45)}50%{box-shadow:0 0 0 8px rgba(240,160,32,0)}}

/* Hero */
.blueprint-hero{position:relative;overflow:hidden;background:linear-gradient(135deg,var(--navy-d) 0%,var(--navy) 55%,#254a78 100%);color:#fff;padding:72px 20px 80px}
.blueprint-hero::before{content:'';position:absolute;inset:0;background:repeating-linear-gradient(0deg,transparent,transparent 39px,rgba(255,255,255,.03) 39px,rgba(255,255,255,.03) 40px),repeating-linear-gradient(90deg,transparent,transparent 39px,rgba(255,255,255,.03) 39px,rgba(255,255,255,.03) 40px);pointer-events:none}
.blueprint-hero .wrap{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;position:relative}
.hero-tag{display:inline-block;font-size:.78rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--amber);margin-bottom:16px}
.blueprint-hero h1{font-family:var(--serif);font-size:clamp(2rem,4.5vw,3rem);line-height:1.2;margin-bottom:20px;font-weight:700}
.blueprint-hero .lead{font-size:1.05rem;color:rgba(255,255,255,.82);max-width:480px;margin-bottom:28px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:8px;font-weight:600;font-size:.95rem;text-decoration:none;transition:.2s;border:none;cursor:pointer}
.btn-amber{background:var(--amber);color:var(--navy-d)}
.btn-amber:hover{background:#ffc040;text-decoration:none}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.35)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08);text-decoration:none}
.hero-visual{position:relative}
.hero-visual img{border-radius:var(--radius);box-shadow:0 20px 60px rgba(0,0,0,.35);cursor:pointer;transition:transform .3s}
.hero-visual img:hover{transform:scale(1.02)}
.meter-ring{position:absolute;bottom:-20px;left:-20px;width:110px;height:110px;background:var(--card);border-radius:50%;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center}
.meter-ring .val{font-size:1.6rem;font-weight:800;color:var(--navy);line-height:1}
.meter-ring .lbl{font-size:.68rem;color:var(--muted);font-weight:600}

/* Spec dock */
.spec-dock{background:var(--card);border-bottom:1px solid var(--line);overflow:hidden}
.spec-dock .track{display:flex;animation:scroll-spec 30s linear infinite;width:max-content}
.spec-dock:hover .track{animation-play-state:paused}
@keyframes scroll-spec{0%{transform:translateX(0)}100%{transform:translateX(-50%)}}
.spec-item{display:flex;align-items:center;gap:12px;padding:18px 32px;border-right:1px solid var(--line);white-space:nowrap}
.spec-item b{font-size:1.15rem;color:var(--navy)}
.spec-item span{font-size:.82rem;color:var(--muted)}

/* Sections */
.section{max-width:1180px;margin:0 auto;padding:72px 20px}
.section-tag{font-size:.75rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--amber-d);margin-bottom:10px}
.section h2{font-family:var(--serif);font-size:clamp(1.5rem,3vw,2rem);color:var(--navy);margin-bottom:12px}
.section .sub{color:var(--muted);max-width:600px;margin-bottom:40px}

/* Engine grid */
.engine-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.engine-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.25s;opacity:0;transform:translateY(24px)}
.engine-card.vis{opacity:1;transform:none}
.engine-card:hover{border-color:var(--amber);box-shadow:var(--shadow)}
.engine-card .ico{width:44px;height:44px;background:linear-gradient(135deg,var(--navy),#2d5a8a);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--amber);font-weight:800;font-size:.85rem;margin-bottom:16px}
.engine-card h3{font-size:1.05rem;margin-bottom:8px;color:var(--navy)}
.engine-card p{font-size:.9rem;color:var(--muted);line-height:1.6}

/* Format lab */
.format-lab{background:var(--navy-d);padding:72px 20px;color:#fff}
.format-lab .inner{max-width:1180px;margin:0 auto}
.format-lab h2{font-family:var(--serif);font-size:clamp(1.5rem,3vw,2rem);margin-bottom:8px}
.format-lab .sub{color:rgba(255,255,255,.65);margin-bottom:32px}
.fmt-tabs{display:flex;gap:8px;margin-bottom:28px;flex-wrap:wrap}
.fmt-tab{padding:10px 22px;border-radius:8px;border:1.5px solid rgba(255,255,255,.2);background:transparent;color:rgba(255,255,255,.7);font-weight:600;font-size:.9rem;cursor:pointer;transition:.2s}
.fmt-tab.active,.fmt-tab:hover{background:var(--amber);color:var(--navy-d);border-color:var(--amber)}
.fmt-panel{display:none;grid-template-columns:1fr 1fr;gap:32px;align-items:center;animation:fadeIn .4s}
.fmt-panel.active{display:grid}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.fmt-panel img{border-radius:var(--radius);cursor:pointer;box-shadow:0 12px 40px rgba(0,0,0,.3)}
.fmt-detail h3{font-family:var(--serif);font-size:1.3rem;margin-bottom:14px;color:var(--amber)}
.fmt-detail p{color:rgba(255,255,255,.8);margin-bottom:12px;font-size:.95rem}
.fmt-detail ul{list-style:none;padding:0}
.fmt-detail li{padding:8px 0 8px 20px;position:relative;color:rgba(255,255,255,.75);font-size:.9rem;border-bottom:1px solid rgba(255,255,255,.06)}
.fmt-detail li::before{content:'▸';position:absolute;left:0;color:var(--amber)}

/* Timeline */
.epoch-wrap{display:grid;grid-template-columns:280px 1fr;gap:48px}
.epoch-rail{position:relative;padding-left:28px;border-left:2px solid var(--line)}
.epoch-item{padding:16px 0 16px 20px;cursor:pointer;position:relative;transition:.2s}
.epoch-item::before{content:'';position:absolute;left:-35px;top:22px;width:12px;height:12px;border-radius:50%;background:var(--line);border:2px solid var(--card);transition:.2s}
.epoch-item.active::before,.epoch-item:hover::before{background:var(--amber);box-shadow:0 0 0 4px rgba(240,160,32,.2)}
.epoch-item .yr{font-weight:800;color:var(--navy);font-size:1.1rem}
.epoch-item .ev{font-size:.85rem;color:var(--muted)}
.epoch-body{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:32px;min-height:280px}
.epoch-body h3{font-family:var(--serif);font-size:1.25rem;color:var(--navy);margin-bottom:12px}
.epoch-body p{color:var(--muted);font-size:.95rem;margin-bottom:10px}

/* Case wall */
.case-wall{columns:3;column-gap:20px}
.case-tile{break-inside:avoid;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:20px;transition:.25s;opacity:0;transform:translateY(16px)}
.case-tile.vis{opacity:1;transform:none}
.case-tile:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.case-tile .tag{display:inline-block;font-size:.72rem;font-weight:700;padding:3px 10px;border-radius:4px;background:rgba(45,120,200,.1);color:var(--blue);margin-bottom:10px}
.case-tile h3{font-size:1rem;color:var(--navy);margin-bottom:8px}
.case-tile p{font-size:.88rem;color:var(--muted)}

/* Deep dive modules */
.split-deep{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-top:48px}
.split-deep.rev{direction:rtl}
.split-deep.rev>*{direction:ltr}
.split-deep img{border-radius:var(--radius);cursor:pointer;box-shadow:var(--shadow);border:1px solid var(--line)}
.split-deep h3{font-family:var(--serif);font-size:1.2rem;color:var(--navy);margin-bottom:12px}
.split-deep p,.split-deep li{font-size:.92rem;color:var(--muted);margin-bottom:10px}
.split-deep ul{padding-left:20px;margin-bottom:12px}
.split-deep code{font-family:var(--mono);font-size:.82rem;background:#e8edf4;padding:2px 6px;border-radius:4px;color:var(--navy)}
.bench-table{width:100%;border-collapse:collapse;margin-top:16px;font-size:.88rem}
.bench-table th,.bench-table td{padding:10px 14px;border:1px solid var(--line);text-align:left}
.bench-table th{background:var(--navy);color:#fff;font-weight:600}
.bench-table tr:nth-child(even){background:rgba(27,58,95,.04)}
.eco-note{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--amber);border-radius:var(--radius);padding:20px 24px;margin-top:20px;font-size:.9rem;color:var(--muted)}

/* Command panel */
.cmd-section{background:linear-gradient(180deg,#1a2332 0%,#121820 100%);padding:72px 20px;color:#c8d6e5}
.cmd-section .inner{max-width:1180px;margin:0 auto;display:grid;grid-template-columns:1fr 1.2fr;gap:40px;align-items:start}
.cmd-section h2{font-family:var(--serif);color:#fff;font-size:clamp(1.4rem,3vw,1.8rem);margin-bottom:12px}
.cmd-section .sub{color:rgba(200,214,229,.6);font-size:.95rem;margin-bottom:24px}
.cmd-acc{border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);overflow:hidden}
.cmd-item{border-bottom:1px solid rgba(255,255,255,.06)}
.cmd-item:last-child{border-bottom:none}
.cmd-q{width:100%;text-align:left;padding:16px 20px;background:rgba(255,255,255,.03);border:none;color:#e8f0f8;font-weight:600;font-size:.92rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:var(--mono)}
.cmd-q::after{content:'+';font-size:1.2rem;color:var(--amber);transition:.2s}
.cmd-item.open .cmd-q::after{transform:rotate(45deg)}
.cmd-a{max-height:0;overflow:hidden;transition:max-height .3s}
.cmd-item.open .cmd-a{max-height:200px}
.cmd-a pre{margin:0;padding:0 20px 16px;font-family:var(--mono);font-size:.82rem;color:#7ec8a0;line-height:1.7;white-space:pre-wrap}
.cmd-visual img{border-radius:var(--radius);cursor:pointer;box-shadow:0 12px 40px rgba(0,0,0,.4)}

/* FAQ */
.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.faq-box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.faq-box h4{font-size:.95rem;color:var(--navy);margin-bottom:8px}
.faq-box p{font-size:.88rem;color:var(--muted)}

/* Download page */
.crumb{font-size:.85rem;color:var(--muted);padding:20px 20px 0;max-width:1180px;margin:0 auto}
.crumb a{color:var(--muted)}
.dl-hero{max-width:1180px;margin:0 auto;padding:40px 20px;display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.dl-hero h1{font-family:var(--serif);font-size:clamp(1.8rem,3.5vw,2.4rem);color:var(--navy)}
.dl-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:1180px;margin:0 auto;padding:0 20px 60px}
.dl-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 20px;text-align:center;text-decoration:none;color:inherit;transition:.25s}
.dl-card:hover{border-color:var(--amber);box-shadow:var(--shadow);transform:translateY(-3px);text-decoration:none}
.dl-card .plat{width:52px;height:52px;margin:0 auto 14px;background:var(--navy);border-radius:12px;display:flex;align-items:center;justify-content:center;color:var(--amber);font-weight:800;font-size:.85rem}
.dl-card b{display:block;font-size:1rem;color:var(--navy);margin-bottom:4px}
.dl-card span{font-size:.82rem;color:var(--muted)}
.dl-card .get{display:inline-block;margin-top:14px;padding:8px 20px;background:var(--amber);color:var(--navy-d);border-radius:6px;font-weight:700;font-size:.85rem}

/* Guide page */
.guide-layout{max-width:1180px;margin:0 auto;padding:40px 20px 72px;display:grid;grid-template-columns:220px 1fr;gap:40px}
.guide-toc{position:sticky;top:calc(var(--hdr) + 20px);align-self:start}
.guide-toc a{display:block;padding:8px 0;color:var(--muted);font-size:.88rem;text-decoration:none;border-left:2px solid transparent;padding-left:14px;transition:.2s}
.guide-toc a:hover,.guide-toc a.on{color:var(--navy);border-color:var(--amber)}
.guide-body h1{font-family:var(--serif);font-size:2rem;color:var(--navy);margin-bottom:8px}
.guide-body .intro{color:var(--muted);margin-bottom:36px}
.guide-block{margin-bottom:48px;scroll-margin-top:calc(var(--hdr) + 16px)}
.guide-block h2{font-family:var(--serif);font-size:1.35rem;color:var(--navy);margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--line)}
.guide-block p,.guide-block li{color:var(--muted);font-size:.95rem;margin-bottom:10px}
.guide-block ul,.guide-block ol{padding-left:22px;margin-bottom:14px}
.guide-block code{font-family:var(--mono);font-size:.85rem;background:#e8edf4;padding:2px 7px;border-radius:4px;color:var(--navy)}
.guide-block pre{background:#1a2332;color:#7ec8a0;padding:18px;border-radius:var(--radius);overflow-x:auto;font-family:var(--mono);font-size:.84rem;line-height:1.7;margin:14px 0}

/* Formats page table */
.fmt-table{width:100%;border-collapse:collapse;background:var(--card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.fmt-table th,.fmt-table td{padding:14px 18px;text-align:left;font-size:.9rem;border-bottom:1px solid var(--line)}
.fmt-table th{background:var(--navy);color:#fff;font-weight:600}
.fmt-table tr:last-child td{border-bottom:none}
.fmt-table .yes{color:#2a9d5c;font-weight:700}
.fmt-table .no{color:#c0392b}

/* Footer */
.site-foot{background:var(--navy-d);color:rgba(255,255,255,.55);padding:32px 20px;text-align:center;font-size:.85rem}
.site-foot a{color:rgba(255,255,255,.7)}
.site-foot .links{margin-top:8px}
.site-foot .friend{margin-top:6px;font-size:.82rem}

/* Mobile dock */
.dock-nav{display:none;position:fixed;bottom:0;left:0;right:0;z-index:300;background:var(--card);border-top:1px solid var(--line);padding:6px 0 env(safe-area-inset-bottom);box-shadow:0 -4px 20px rgba(0,0,0,.08)}
.dock-nav a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 4px;font-size:.68rem;color:var(--muted);text-decoration:none;font-weight:600}
.dock-nav a.on{color:var(--navy)}
.dock-nav a .dot{width:6px;height:6px;border-radius:50%;background:transparent}
.dock-nav a.on .dot{background:var(--amber)}
.dock-nav .dl-dock{color:var(--amber-d)}
.dock-inner{display:flex;max-width:480px;margin:0 auto}

/* Modal */
.modal{display:none;position:fixed;inset:0;z-index:500;background:rgba(0,0,0,.85);align-items:center;justify-content:center;padding:20px}
.modal.open{display:flex}
.modal img{max-width:95vw;max-height:90vh;border-radius:8px}
.modal-close{position:absolute;top:20px;right:24px;background:none;border:none;color:#fff;font-size:1.6rem;cursor:pointer}

/* Responsive */
@media(max-width:960px){
  .blueprint-hero .wrap,.fmt-panel,.epoch-wrap,.cmd-section .inner,.dl-hero,.guide-layout,.split-deep{grid-template-columns:1fr}
  .engine-grid{grid-template-columns:1fr 1fr}
  .case-wall{columns:2}
  .dl-grid{grid-template-columns:1fr 1fr}
  .faq-list{grid-template-columns:1fr}
  .hero-visual{order:-1}
  .meter-ring{bottom:10px;left:10px;width:90px;height:90px}
  .guide-toc{display:none}
}
@media(max-width:640px){
  .hdr-nav{display:none}
  .engine-grid,.case-wall,.dl-grid{grid-template-columns:1fr}
  .dock-nav{display:block}
  body{padding-bottom:64px}
  .blueprint-hero{padding:48px 16px 60px}
  .section{padding:48px 16px}
}