:root{
  --navy:#0B1B3A;--navy-2:#13285A;--ink:#0F172A;--muted:#5B6478;--line:#E4E7EE;
  --bg:#FAFAF7;--card:#FFFFFF;--gold:#F5B544;--gold-d:#D99420;--teal:#1FA597;--soft:#F1F3F8;
  --radius:16px;--shadow:0 10px 30px -12px rgba(11,27,58,.18);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
h1,h2,h3{font-family:Fraunces,Georgia,serif;line-height:1.15;letter-spacing:-.01em}
h2{font-size:clamp(28px,4vw,42px);margin-bottom:14px}
.eyebrow{display:inline-block;font-size:13px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-d);margin-bottom:12px}
.lead{color:var(--muted);font-size:18px;max-width:640px}
section{padding:90px 0}
.center{text-align:center}.center .lead{margin:0 auto}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:999px;font-weight:600;font-size:15px;border:0;cursor:pointer;transition:.2s}
.btn-gold{background:var(--gold);color:var(--navy)}.btn-gold:hover{background:#ffc45e;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.35)}.btn-ghost:hover{border-color:#fff}
.btn-navy{background:var(--navy);color:#fff}.btn-navy:hover{background:var(--navy-2)}
.btn-wa{background:#25D366;color:#fff}.btn-wa:hover{background:#1ebe5b}

/* NAV */
header{position:sticky;top:0;z-index:50;background:rgba(11,27,58,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-family:Fraunces,serif;font-size:24px;font-weight:700}
.logo-mark{width:38px;height:38px;border-radius:10px;background:var(--gold);color:var(--navy);display:grid;place-items:center;font-size:22px}
.logo span b{color:var(--gold)}
.nav ul{display:flex;gap:28px;list-style:none}
.nav ul a{color:rgba(255,255,255,.8);font-size:15px;font-weight:500}.nav ul a:hover{color:#fff}
.nav .btn{padding:10px 18px}
.burger{display:none;background:none;border:0;color:#fff;font-size:26px;cursor:pointer}

/* HERO */
.hero{background:radial-gradient(1200px 500px at 85% -10%,#2A4A9A 0%,transparent 60%),linear-gradient(180deg,var(--navy),#0E2147);color:#fff;padding:80px 0 110px;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:38px 38px;mask-image:linear-gradient(180deg,#000 40%,transparent)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center;position:relative}
.hero h1{font-size:clamp(38px,5.6vw,64px);margin-bottom:20px}
.hero h1 em{font-style:normal;color:var(--gold)}
.hero p.lead{color:rgba(255,255,255,.78)}
.search{margin-top:30px;background:#fff;border-radius:999px;display:flex;padding:6px;box-shadow:0 20px 40px -15px rgba(0,0,0,.4);position:relative}
.search input{flex:1;border:0;outline:0;font:inherit;font-size:16px;padding:12px 18px;border-radius:999px;color:var(--ink);min-width:0}
.search .btn{padding:12px 22px}
.results{position:absolute;top:calc(100% + 8px);left:0;right:0;background:#fff;border-radius:14px;box-shadow:var(--shadow);color:var(--ink);display:none;max-height:320px;overflow:auto;z-index:5;text-align:left}
.results a{display:block;padding:12px 18px;border-bottom:1px solid var(--line);font-size:15px}
.results a:hover{background:var(--soft)}
.results small{color:var(--muted);display:block;font-size:12.5px}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.chip{font-size:13.5px;padding:7px 14px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.88);cursor:pointer}
.chip:hover{background:rgba(255,255,255,.16)}
.hero-card{background:#fff;color:var(--ink);border-radius:20px;padding:28px;box-shadow:0 30px 60px -20px rgba(0,0,0,.5);position:relative}
.hero-card .tag{display:inline-block;background:#FFF4DE;color:var(--gold-d);font-size:12px;font-weight:700;padding:5px 10px;border-radius:6px;margin-bottom:12px;letter-spacing:.04em}
.hero-card h3{font-size:20px;margin-bottom:6px}
.step{display:flex;gap:14px;padding:12px 0;border-top:1px dashed var(--line)}
.step:first-of-type{border-top:0}
.step .n{flex:0 0 26px;height:26px;border-radius:50%;background:var(--navy);color:#fff;font-size:13px;font-weight:700;display:grid;place-items:center;margin-top:2px}
.step div{font-size:15px;overflow-x:auto}
.answer{margin-top:12px;background:#E9F8F5;border-radius:12px;padding:12px 16px;color:#0E6E64;font-weight:600}
.floating{position:absolute;font-family:Fraunces,serif;color:rgba(255,255,255,.12);font-size:90px;pointer-events:none}

/* TRUST BAR */
.trust{background:#fff;border-bottom:1px solid var(--line);padding:26px 0}
.trust .wrap{display:flex;justify-content:space-around;flex-wrap:wrap;gap:20px}
.trust div{text-align:center}
.trust strong{display:block;font-family:Fraunces,serif;font-size:26px;color:var(--navy)}
.trust span{font-size:14px;color:var(--muted)}

/* CLASSES */
.class-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px;margin-top:44px}
.class-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px 18px;transition:.2s;cursor:pointer;text-align:left}
.class-card:hover{border-color:var(--navy);transform:translateY(-3px);box-shadow:var(--shadow)}
.class-card .num{font-family:Fraunces,serif;font-size:34px;color:var(--navy);line-height:1}
.class-card .lbl{font-size:13px;color:var(--muted);margin-top:6px}
.class-card.hl{background:var(--navy);border-color:var(--navy)}
.class-card.hl .num{color:var(--gold)}.class-card.hl .lbl{color:rgba(255,255,255,.75)}

/* FEATURED BOOK */
.featured{background:var(--soft)}
.feat-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px;align-items:center}
.book{aspect-ratio:3/4;max-width:340px;margin:0 auto;border-radius:6px 16px 16px 6px;background:linear-gradient(135deg,#0B1B3A 0%,#1D3C82 100%);color:#fff;padding:34px 30px;box-shadow:-10px 0 0 #081430 inset,0 30px 50px -20px rgba(11,27,58,.55);display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.book::after{content:"∫ π √ Σ θ";position:absolute;bottom:-10px;right:-20px;font-family:Fraunces,serif;font-size:64px;color:rgba(255,255,255,.07);white-space:nowrap}
.book .b-top{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}
.book h3{font-size:42px;margin:10px 0}
.book .b-sub{font-size:15px;color:rgba(255,255,255,.75)}
.book .b-auth{border-top:1px solid rgba(255,255,255,.2);padding-top:14px;font-size:14px}
.chapters{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:26px 0}
.chapters div{background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 14px;font-size:14.5px;display:flex;gap:10px}
.chapters b{color:var(--gold-d);font-family:Fraunces,serif;min-width:20px}

/* BOOKS / BOARDS */
.boards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.board{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.2s;display:flex;flex-direction:column}
.board:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.board .ic{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;font-size:22px;margin-bottom:16px;font-family:Fraunces,serif;font-weight:700}
.board h3{font-size:21px;margin-bottom:8px}
.board p{color:var(--muted);font-size:15px;flex:1}
.board .more{margin-top:18px;font-weight:600;font-size:14.5px;color:var(--navy)}
.board .more:hover{color:var(--gold-d)}

/* TOPICS */
.topics{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:36px}
.topic{padding:12px 20px;border-radius:999px;background:#fff;border:1px solid var(--line);font-weight:500;font-size:15px}
.topic i{font-style:normal;color:var(--gold-d);font-family:Fraunces,serif;margin-right:6px}

/* LIBRARY */
.library{background:linear-gradient(180deg,#fff,var(--bg))}
.lib-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap}
.lib-search{display:flex;align-items:center;gap:10px;background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:4px 6px 4px 18px;min-width:300px;flex:0 1 380px}
.lib-search input{border:0;padding:10px 4px;font-size:15px}
.lib-search span{color:var(--muted);font-size:13px;white-space:nowrap;padding-right:10px}
.lib-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:30px 0 26px}
.lib-tab{border:1.5px solid var(--line);background:#fff;padding:9px 16px;border-radius:999px;font:inherit;font-size:14px;font-weight:600;color:var(--muted);cursor:pointer;transition:.2s}
.lib-tab:hover{border-color:var(--navy);color:var(--navy)}
.lib-tab.active{background:var(--navy);border-color:var(--navy);color:#fff}
.lib-tab b{font-weight:600;opacity:.6;margin-left:4px}
.lib-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px}
.bk{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;display:flex;flex-direction:column;transition:.25s}
.bk:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.bk-cover{aspect-ratio:4/3;padding:16px 16px 14px;color:#fff;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.bk-cover::before{content:"";position:absolute;left:0;top:0;bottom:0;width:8px;background:rgba(0,0,0,.18)}
.bk-cover::after{content:attr(data-sym);position:absolute;right:-6px;bottom:-22px;font-family:Fraunces,serif;font-size:96px;line-height:1;color:rgba(255,255,255,.13)}
.bk-cat{font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;opacity:.85;font-weight:700}
.bk-t{font-family:Fraunces,serif;font-size:17px;line-height:1.2;position:relative;z-index:1}
.bk-body{padding:14px 16px 16px;display:flex;flex-direction:column;flex:1}
.bk-a{font-size:13.5px;color:var(--muted);flex:1}
.bk-l{display:inline-block;font-size:11.5px;font-weight:600;color:var(--navy);background:var(--soft);padding:3px 9px;border-radius:6px;margin:8px 0 12px;align-self:flex-start}
.bk-btn{font:inherit;font-size:13.5px;font-weight:600;border:1.5px solid var(--navy);color:var(--navy);background:#fff;border-radius:999px;padding:8px 12px;cursor:pointer;transition:.2s}
.bk-btn:hover{background:var(--navy);color:#fff}
.lib-more{text-align:center;margin-top:30px}
.lib-empty{grid-column:1/-1;text-align:center;padding:40px;color:var(--muted);background:#fff;border:1px dashed var(--line);border-radius:14px}

/* FEATURES */
.feats{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:46px}
.feat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.feat .fi{width:46px;height:46px;border-radius:12px;background:var(--navy);color:var(--gold);display:grid;place-items:center;font-family:Fraunces,serif;font-size:22px;margin-bottom:16px}
.feat h3{font-size:18px;margin-bottom:6px}
.feat p{font-size:14.5px;color:var(--muted)}

/* INTERACTIVE SOLUTION */
.solver{background:var(--navy);color:#fff}
.solver .lead{color:rgba(255,255,255,.75)}
.sol-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:50px;align-items:start;margin-top:10px}
.sol-tabs{display:flex;flex-direction:column;gap:12px;margin-top:28px}
.sol-tab{text-align:left;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:#fff;padding:16px 18px;border-radius:14px;cursor:pointer;font:inherit;transition:.2s}
.sol-tab small{display:block;color:rgba(255,255,255,.6);font-size:13px}
.sol-tab.active{background:var(--gold);color:var(--navy);border-color:var(--gold)}
.sol-tab.active small{color:rgba(11,27,58,.7)}
.sol-box{background:#fff;color:var(--ink);border-radius:20px;padding:30px;min-height:420px}
.sol-box .q{font-size:17px;padding-bottom:16px;border-bottom:1px solid var(--line);margin-bottom:8px;overflow-x:auto}
.sol-steps .step{opacity:0;transform:translateY(6px);transition:.35s;display:none}
.sol-steps .step.show{opacity:1;transform:none;display:flex}
.sol-ctrl{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}

/* HOW IT WORKS */
.how{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;margin-top:50px;counter-reset:h}
.how div{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;position:relative}
.how div::before{counter-increment:h;content:"0" counter(h);font-family:Fraunces,serif;font-size:44px;color:var(--gold);display:block;line-height:1;margin-bottom:14px}
.how h3{font-size:20px;margin-bottom:8px}
.how p{color:var(--muted);font-size:15px}

/* ASK */
.ask{background:linear-gradient(135deg,#FFF8E8,#FDF1D6)}
.ask-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
form.card{background:#fff;border-radius:20px;padding:32px;box-shadow:var(--shadow)}
label{display:block;font-size:14px;font-weight:600;margin:14px 0 6px}
input,select,textarea{width:100%;font:inherit;font-size:15px;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);outline:0;transition:.2s}
input:focus,select:focus,textarea:focus{border-color:var(--navy)}
textarea{min-height:110px;resize:vertical}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.perks{list-style:none;margin-top:24px}
.perks li{padding:9px 0 9px 34px;position:relative;font-size:16px}
.perks li::before{content:"✓";position:absolute;left:0;top:8px;width:22px;height:22px;border-radius:50%;background:var(--teal);color:#fff;font-size:12px;display:grid;place-items:center;font-weight:700}

/* FAQ */
.faq{max-width:800px;margin:40px auto 0}
details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px;margin-bottom:12px}
summary{font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;font-size:16.5px}
summary::after{content:"+";font-size:22px;color:var(--gold-d);line-height:1}
details[open] summary::after{content:"−"}
details p{color:var(--muted);margin-top:10px;font-size:15.5px}

/* CTA + FOOTER */
.cta{background:var(--navy);color:#fff;border-radius:24px;padding:56px;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap;margin-top:-40px;position:relative;box-shadow:var(--shadow)}
.cta h2{margin:0}.cta p{color:rgba(255,255,255,.75)}
footer{background:#081430;color:rgba(255,255,255,.7);padding:70px 0 30px;margin-top:90px}
.foot{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
footer h4{color:#fff;font-size:15px;margin-bottom:14px;font-family:Inter,sans-serif}
footer ul{list-style:none}
footer li{margin:8px 0;font-size:14.5px}
footer a:hover{color:var(--gold)}
.copy{border-top:1px solid rgba(255,255,255,.1);margin-top:50px;padding-top:24px;font-size:13.5px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.wa-float{position:fixed;right:20px;bottom:20px;width:58px;height:58px;border-radius:50%;background:#25D366;display:grid;place-items:center;box-shadow:0 10px 25px rgba(0,0,0,.25);z-index:60;transition:.2s}
.wa-float:hover{transform:scale(1.07)}

@media (max-width:960px){
  .hero-grid,.feat-grid,.sol-grid,.ask-grid{grid-template-columns:1fr}
  .boards,.how,.feats{grid-template-columns:1fr 1fr}
  .foot{grid-template-columns:1fr 1fr}
  .nav ul{display:none;position:absolute;top:70px;left:0;right:0;background:var(--navy);flex-direction:column;padding:20px;gap:16px}
  .nav ul.open{display:flex}
  .burger{display:block}
  .nav .btn.hide-m{display:none}
}
@media (max-width:600px){
  section{padding:64px 0}
  .boards,.how,.chapters,.row2,.foot,.feats{grid-template-columns:1fr}
  .lib-grid{grid-template-columns:1fr 1fr;gap:12px}
  .bk-t{font-size:15px}.bk-body{padding:12px}
  .lib-search{min-width:0;flex:1 1 100%}
  .search{flex-direction:column;border-radius:18px;gap:6px}
  .search .btn{justify-content:center}
  .cta{padding:34px 24px}
  .hero{padding:56px 0 80px}
}

/* SUBPAGES */
.page-hero{background:radial-gradient(900px 400px at 90% -20%,#2A4A9A 0%,transparent 60%),linear-gradient(180deg,var(--navy),#0E2147);color:#fff;padding:64px 0 70px}
.page-hero h1{font-size:clamp(32px,4.6vw,52px);margin-bottom:14px}
.page-hero .lead{color:rgba(255,255,255,.78)}
.crumbs{font-size:13.5px;color:rgba(255,255,255,.6);margin-bottom:18px}
.crumbs a:hover{color:var(--gold)}
.bp-grid{display:grid;grid-template-columns:300px 1fr;gap:56px;align-items:start}
.bp-cover{border-radius:6px 16px 16px 6px;aspect-ratio:3/4;padding:28px 24px;color:#fff;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden;box-shadow:-9px 0 0 rgba(0,0,0,.2) inset,0 30px 50px -20px rgba(0,0,0,.6)}
.bp-cover::after{content:attr(data-sym);position:absolute;right:-8px;bottom:-30px;font-family:Fraunces,serif;font-size:150px;line-height:1;color:rgba(255,255,255,.12)}
.bp-cover h2{font-size:26px;position:relative;z-index:1}
.bp-meta{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0 26px}
.bp-meta span{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);border-radius:999px;padding:6px 14px;font-size:13.5px}
.bp-body{display:grid;grid-template-columns:1.4fr .9fr;gap:40px;align-items:start}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;margin-bottom:24px}
.panel h2{font-size:26px}
.panel p{color:var(--muted);font-size:16px}
.toc{list-style:none;counter-reset:t;margin-top:10px}
.toc li{counter-increment:t;display:flex;gap:14px;padding:12px 0;border-bottom:1px dashed var(--line);font-size:15.5px}
.toc li:last-child{border-bottom:0}
.toc li::before{content:counter(t,decimal-leading-zero);font-family:Fraunces,serif;color:var(--gold-d);min-width:26px}
.side{position:sticky;top:90px}
.side .panel{background:var(--navy);color:#fff;border:0}
.side .panel p{color:rgba(255,255,255,.75)}
.side .btn{width:100%;justify-content:center;margin-top:12px}
.related{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:26px}
.prose{max-width:780px}
.prose h2{margin-top:36px}.prose p{color:var(--muted);font-size:17px;margin-top:12px}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.contact-card h3{font-size:20px;margin:10px 0 6px}
.contact-card p{color:var(--muted)}
@media (max-width:960px){.bp-grid,.bp-body{grid-template-columns:1fr}.bp-cover{max-width:280px}.related{grid-template-columns:1fr 1fr}.contact-grid{grid-template-columns:1fr}.side{position:static}}

/* ===== MOTION & POLISH ===== */
.step div,.sol-box .q{overflow-y:hidden}
.step div .katex-display{margin:.2em 0}
header{transition:background .3s,box-shadow .3s}
header.scrolled{background:rgba(8,20,48,.97);box-shadow:0 10px 30px -15px rgba(0,0,0,.5)}
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--gold),#ffd98a);z-index:80;transition:width .1s linear}
.rv{opacity:0;transform:translateY(28px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.rv.rv-l{transform:translateX(-36px)}.rv.rv-r{transform:translateX(36px)}.rv.rv-z{transform:scale(.94)}
.rv.in{opacity:1;transform:none}
.btn{position:relative;overflow:hidden}
.btn::after{content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;background:linear-gradient(110deg,transparent,rgba(255,255,255,.45),transparent);transform:skewX(-20deg);transition:left .7s}
.btn:hover::after{left:140%}
.board,.bk,.art,.svc,.feat,.class-card,.panel,.subj{will-change:transform}
.board:hover,.svc:hover,.feat:hover,.art:hover{border-color:transparent;box-shadow:0 0 0 1.5px var(--gold),0 22px 40px -22px rgba(11,27,58,.45)}
.feat .fi,.svc .fi{transition:transform .5s cubic-bezier(.2,.7,.2,1)}
.feat:hover .fi,.svc:hover .fi{transform:rotate(-8deg) scale(1.1)}
.logo-mark{transition:transform .6s}
.logo:hover .logo-mark{transform:rotate(360deg)}
/* floating symbols in every dark hero */
.hero,.page-hero{position:relative;overflow:hidden}
.sym-field{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.sym-field span{position:absolute;bottom:-60px;font-family:Fraunces,serif;color:rgba(255,255,255,.09);animation:floatUp linear infinite}
@keyframes floatUp{0%{transform:translateY(0) rotate(0)}100%{transform:translateY(-120vh) rotate(160deg)}}
.page-hero .wrap{position:relative;z-index:1}
.orb{position:absolute;border-radius:50%;filter:blur(60px);opacity:.45;pointer-events:none;animation:orb 12s ease-in-out infinite alternate}
@keyframes orb{to{transform:translate(60px,40px) scale(1.15)}}
/* rotating word */
.rot{display:inline-block;color:var(--gold);position:relative}
.rot .w{display:inline-block;animation:wordIn .6s cubic-bezier(.2,.7,.2,1)}
@keyframes wordIn{from{opacity:0;transform:translateY(60%) rotateX(60deg)}to{opacity:1;transform:none}}
.caret{display:inline-block;width:3px;height:.9em;background:var(--gold);margin-left:4px;vertical-align:-.08em;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
/* hero visual */
.hero-visual{position:relative;min-height:610px}
.hero-photo{position:absolute;right:0;top:0;width:80%;height:470px;border-radius:24px;object-fit:cover;box-shadow:0 40px 80px -30px rgba(0,0,0,.7);border:4px solid rgba(255,255,255,.08)}
.hero-visual .hero-card{position:absolute;left:-28px;bottom:0;width:66%;padding:22px;animation:bob 6s ease-in-out infinite}.hero-visual .hero-card .step div{font-size:14px}.hero-visual .hero-card h3{font-size:18px}
@keyframes bob{50%{transform:translateY(-12px)}}
.chip-float{position:absolute;background:#fff;color:var(--navy);border-radius:14px;padding:10px 14px;font-weight:700;font-size:13.5px;display:flex;gap:10px;align-items:center;box-shadow:0 18px 40px -18px rgba(0,0,0,.6);animation:bob 5s ease-in-out infinite}
.chip-float i{font-style:normal;width:32px;height:32px;border-radius:10px;display:grid;place-items:center;background:var(--navy);color:var(--gold);font-family:Fraunces,serif}
.chip-float small{display:block;font-weight:500;color:var(--muted);font-size:12px}
/* marquee */
.marquee{background:var(--gold);color:var(--navy);overflow:hidden;white-space:nowrap;padding:14px 0;font-weight:700;font-size:15px;border-top:1px solid #e6a634;border-bottom:1px solid #e6a634}
.marquee .track{display:inline-flex;gap:38px;animation:mq 40s linear infinite;padding-left:38px}
.marquee .track span::before{content:"✦";margin-right:38px;opacity:.6}
@keyframes mq{to{transform:translateX(-50%)}}
.marquee:hover .track{animation-play-state:paused}
/* subject photo cards */
.subj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.subj{position:relative;border-radius:20px;overflow:hidden;min-height:300px;display:flex;align-items:flex-end;color:#fff;isolation:isolate;transition:transform .5s cubic-bezier(.2,.7,.2,1)}
.subj img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2;transition:transform 1.2s cubic-bezier(.2,.7,.2,1)}
.subj::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,27,58,.05) 20%,rgba(11,27,58,.92));z-index:-1}
.subj:hover img{transform:scale(1.08)}
.subj:hover{transform:translateY(-6px)}
.subj .in{padding:26px}
.subj .tag{display:inline-block;background:var(--gold);color:var(--navy);font-size:11.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:6px}
.subj h3{font-size:24px;margin:10px 0 6px}
.subj p{font-size:14.5px;color:rgba(255,255,255,.82)}
.subj .go{display:inline-block;margin-top:12px;font-weight:600;font-size:14px;color:var(--gold)}
/* counters band */
.counters{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.counter{text-align:center;padding:26px 10px;border-radius:18px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12)}
.counter b{display:block;font-family:Fraunces,serif;font-size:44px;color:var(--gold);line-height:1}
.counter span{color:rgba(255,255,255,.78);font-size:14.5px}
/* photo band */
.photo-band{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.collage{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:180px 180px;gap:14px}
.collage img{width:100%;height:100%;object-fit:cover;border-radius:18px;box-shadow:var(--shadow)}
.collage img:first-child{grid-row:span 2}
/* timeline */
.timeline{position:relative;margin:50px auto 0;max-width:980px}
.timeline::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:3px;background:linear-gradient(var(--gold),rgba(245,181,68,.15));transform:translateX(-50%)}
.tl{position:relative;width:50%;padding:0 44px 40px}
.tl:nth-child(odd){left:0;text-align:right}
.tl:nth-child(even){left:50%}
.tl::before{content:"";position:absolute;top:6px;width:18px;height:18px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 6px rgba(245,181,68,.25)}
.tl:nth-child(odd)::before{right:-9px}.tl:nth-child(even)::before{left:-9px}
.tl .ty{font-family:Fraunces,serif;font-size:26px;color:var(--gold-d);font-weight:700}
.tl h3{font-size:20px;margin:4px 0 6px}
.tl p{color:var(--muted);font-size:15.5px}
.tl a{font-weight:600;font-size:14px;color:var(--navy)}
.dark .tl p{color:rgba(255,255,255,.75)}.dark .tl h3{color:#fff}.dark .tl a{color:var(--gold)}
/* engineering disciplines */
.disc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.disc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px;transition:.3s}
.disc:hover{transform:translateY(-4px);box-shadow:0 0 0 1.5px var(--gold),0 22px 40px -22px rgba(11,27,58,.45)}
.disc .fi{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;font-size:22px;margin-bottom:14px;font-family:Fraunces,serif;font-weight:700}
.disc h3{font-size:20px;margin-bottom:8px}.disc ul{list-style:none;margin-top:10px}
.disc li{font-size:14.5px;color:var(--muted);padding:5px 0 5px 20px;position:relative}
.disc li::before{content:"→";position:absolute;left:0;color:var(--gold-d)}
.credit{font-size:12px;color:rgba(255,255,255,.5);margin-top:10px}
.credit a{text-decoration:underline}
@media (max-width:960px){.hero-visual{min-height:600px;margin-top:20px}.hero-visual .hero-card{left:0}.subj-grid,.disc-grid{grid-template-columns:1fr 1fr}.counters{grid-template-columns:1fr 1fr}.photo-band{grid-template-columns:1fr}}
@media (max-width:600px){.hero-photo{width:100%;height:260px}.hero-visual{min-height:0}.hero-visual .hero-card{width:100%;position:relative;left:0;margin-top:230px}.chip-float{right:0!important}.chip-float.c2{display:none}.subj-grid,.disc-grid{grid-template-columns:1fr}
 .timeline::before{left:12px}.tl,.tl:nth-child(even){width:100%;left:0;text-align:left;padding:0 0 32px 44px}.tl:nth-child(odd){text-align:left}.tl:nth-child(odd)::before,.tl:nth-child(even)::before{left:3px;right:auto}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}}

/* ABOUT / CONTACT / ARTICLES */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.svc{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.2s}
.svc:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.svc .fi{width:50px;height:50px;border-radius:14px;background:var(--navy);color:var(--gold);display:grid;place-items:center;font-family:Fraunces,serif;font-size:22px;margin-bottom:16px}
.svc h3{font-size:20px;margin-bottom:8px}.svc p{color:var(--muted);font-size:15px}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:40px}
.stat{background:var(--navy);color:#fff;border-radius:var(--radius);padding:24px;text-align:center}
.stat b{display:block;font-family:Fraunces,serif;font-size:32px;color:var(--gold)}
.stat span{font-size:14px;color:rgba(255,255,255,.75)}
.cform-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:0;background:#fff;border-radius:24px;overflow:hidden;box-shadow:0 30px 70px -30px rgba(11,27,58,.45);margin-top:-60px;position:relative}
.cform-side{background:radial-gradient(500px 300px at 100% 0%,#2A4A9A 0%,transparent 70%),var(--navy);color:#fff;padding:44px 38px;display:flex;flex-direction:column;gap:22px}
.cform-side h2{font-size:30px;margin:0}.cform-side p{color:rgba(255,255,255,.75)}
.cm{display:flex;gap:14px;align-items:flex-start;padding:16px;border-radius:14px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);transition:.2s}
.cm:hover{background:rgba(255,255,255,.12)}
.cm .ico{flex:0 0 42px;height:42px;border-radius:12px;display:grid;place-items:center;font-size:20px}
.cm b{display:block;font-size:15px}.cm small{color:rgba(255,255,255,.7);font-size:13.5px}
.cform{padding:44px 40px}
.cform h3{font-size:24px;margin-bottom:4px}.cform .sub{color:var(--muted);font-size:15px;margin-bottom:10px}
.seg{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.seg input{display:none}
.seg label{margin:0;font-weight:600;font-size:14px;padding:10px 16px;border:1.5px solid var(--line);border-radius:999px;cursor:pointer;color:var(--muted);transition:.15s}
.seg input:checked+label{background:var(--navy);border-color:var(--navy);color:#fff}
.field{position:relative}
.cform .row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.cform .btn{padding:15px 26px;font-size:16px}
.note{font-size:13px;color:var(--muted);margin-top:12px}
.art-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.art{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;transition:.2s}
.art:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.art .tag{font-size:11.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-d)}
.art h3{font-size:19px;margin:10px 0 8px;line-height:1.25}
.art p{color:var(--muted);font-size:14.5px;flex:1}
.art .rm{margin-top:14px;font-weight:600;font-size:14px;color:var(--navy)}
.article{max-width:760px;margin:0 auto;font-size:17.5px;line-height:1.75}
.article h2{font-size:30px;margin:42px 0 12px}.article h3{font-size:22px;margin:28px 0 10px}
.article p{margin:14px 0;color:#2A3346}.article ul,.article ol{margin:14px 0 14px 24px;color:#2A3346}.article li{margin:6px 0}
.article .katex-display{overflow-x:auto;overflow-y:hidden;padding:6px 0;background:var(--soft);border-radius:10px;margin:18px 0}
.article table{border-collapse:collapse;margin:18px 0;width:100%;font-size:15.5px}.article th,.article td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.article code{background:var(--soft);padding:2px 6px;border-radius:5px;font-size:.9em}
.art-cta{background:var(--navy);color:#fff;border-radius:20px;padding:30px;margin:44px 0 0;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.art-cta h3{font-size:22px}.art-cta p{color:rgba(255,255,255,.75);margin:4px 0 0}
@media (max-width:960px){.svc-grid,.art-grid{grid-template-columns:1fr 1fr}.stat-row{grid-template-columns:1fr 1fr}.cform-wrap{grid-template-columns:1fr;margin-top:-40px}.cform .row3{grid-template-columns:1fr}}
@media (max-width:600px){.svc-grid,.art-grid{grid-template-columns:1fr}.cform,.cform-side{padding:30px 22px}.article{font-size:16.5px}}
.sol-tabs{display:grid;grid-template-columns:1fr 1fr;gap:10px}.sol-tab{padding:13px 15px}