/* ==========================================================================
   GPR Data Hub — design system
   ========================================================================== */
:root{
  --navy:#0f2a47; --navy-2:#12325a; --navy-3:#1c4a80;
  --gold:#c9a227; --gold-2:#b3901f;
  --ink:#18212e; --muted:#5c6b7c; --faint:#8493a3;
  --line:#e7edf3; --line-2:#dbe4ee;
  --bg:#ffffff; --bg-soft:#f5f8fc; --bg-navy:#0f2a47;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --serif:'Fraunces','Iowan Old Style',Georgia,'Times New Roman',serif;
  --radius:14px; --radius-sm:10px;
  --shadow:0 1px 2px rgba(16,42,71,.04),0 8px 24px rgba(16,42,71,.06);
  --shadow-lg:0 12px 40px rgba(16,42,71,.14);
  --wrap:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.6;
  -webkit-font-smoothing:antialiased;font-size:16.5px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.serif{font-family:var(--serif)}
.eyebrow{font-size:.78rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--gold-2)}
.muted{color:var(--muted)}

/* ---------- header ---------- */
.hdr{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-weight:800;font-size:1.18rem;letter-spacing:-.01em;color:var(--navy);display:flex;align-items:center;gap:2px}
.brand b{color:var(--gold-2)}
.brand .dot{width:7px;height:7px;border-radius:50%;background:var(--gold);margin-right:9px;display:inline-block}
.nav{display:flex;align-items:center;gap:4px}
.nav a,.nav .navitem>span{display:inline-block;padding:9px 14px;border-radius:9px;font-size:.94rem;font-weight:500;color:#34435a;cursor:pointer;transition:.15s}
.nav a:hover,.nav .navitem>span:hover{background:var(--bg-soft);color:var(--navy)}
.nav a.active{color:var(--navy);font-weight:600}
.nav .cta{background:var(--navy);color:#fff;margin-left:6px}
.nav .cta:hover{background:var(--navy-2);color:#fff}
/* dropdown */
.navitem{position:relative}
.navitem>span::after{content:"▾";font-size:.7em;margin-left:6px;color:var(--faint)}
.dropdown{position:absolute;top:calc(100% + 8px);left:0;min-width:300px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);
  padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.16s}
.navitem:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:flex;gap:12px;align-items:flex-start;padding:11px 12px;border-radius:10px;font-weight:500}
.dropdown a:hover{background:var(--bg-soft)}
.dropdown .ico{width:34px;height:34px;border-radius:9px;background:var(--navy);color:#fff;
  display:grid;place-items:center;font-size:1rem;flex:0 0 auto}
.dropdown .t{font-weight:600;color:var(--navy);font-size:.92rem;line-height:1.3}
.dropdown .d{font-size:.78rem;color:var(--muted)}
.dropdown .div{height:1px;background:var(--line);margin:6px 8px}
.dropdown .all{color:var(--gold-2);font-weight:600;font-size:.86rem;justify-content:center;padding:9px}
.menu-btn{display:none}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:11px;
  font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:.16s}
.btn-primary{background:var(--gold);color:#1c1400}
.btn-primary:hover{background:var(--gold-2);transform:translateY(-1px)}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{background:var(--navy-2);transform:translateY(-1px)}
.btn-ghost{background:transparent;border-color:rgba(255,255,255,.28);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-line{background:#fff;border-color:var(--line-2);color:var(--navy)}
.btn-line:hover{border-color:var(--navy);transform:translateY(-1px)}

/* ---------- hero ---------- */
.hero{background:radial-gradient(1200px 500px at 78% -10%,rgba(201,162,39,.16),transparent 60%),
  linear-gradient(160deg,#0f2a47 0%,#102f56 55%,#0b2137 100%);
  color:#fff;position:relative;overflow:hidden}
.hero .wrap{padding:82px 24px 88px;position:relative;z-index:2}
.hero .eyebrow{color:var(--gold)}
.hero h1{font-family:var(--serif);font-weight:600;font-size:clamp(2.4rem,4.8vw,4rem);
  line-height:1.05;letter-spacing:-.02em;margin:16px 0 18px;max-width:16ch}
.hero p.lead{font-size:1.18rem;color:#c6d4e6;max-width:60ch;margin-bottom:30px}
.hero .btns{display:flex;gap:14px;flex-wrap:wrap}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);
  border-radius:18px;padding:22px;backdrop-filter:blur(4px)}
.hero-card h4{font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gold);margin-bottom:14px;font-weight:600}
.hero-spark{display:flex;flex-direction:column;gap:14px}
.hero-spark .row{display:flex;align-items:center;gap:14px}
.hero-spark .row .lbl{width:96px;font-size:.85rem;color:#cdd9ea;font-weight:600;flex:0 0 auto}
.hero-spark .row .bar{flex:1;background:rgba(255,255,255,.9);border-radius:7px;padding:5px 8px}
.hero-spark img{height:30px;width:100%;object-fit:contain;filter:none}

/* ---------- stats band ---------- */
.stats{background:var(--navy-2);color:#fff}
.stats .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;padding:26px 24px}
.stat{text-align:center;flex:1;min-width:120px}
.stat .n{font-family:var(--serif);font-size:1.9rem;font-weight:600;color:#fff;line-height:1}
.stat .l{font-size:.82rem;color:#a9bcd4;margin-top:6px}

/* ---------- sections ---------- */
section{padding:78px 0}
.sec-soft{background:var(--bg-soft)}
.sec-head{max-width:640px;margin-bottom:44px}
.sec-head.center{margin:0 auto 48px;text-align:center}
.sec-head h2{font-family:var(--serif);font-weight:600;font-size:clamp(1.8rem,3vw,2.5rem);letter-spacing:-.02em;color:var(--navy);line-height:1.1}
.sec-head p{color:var(--muted);font-size:1.08rem;margin-top:12px}

/* ---------- index cards ---------- */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.icard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
.icard:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--line-2)}
.icard .top{padding:22px 24px 6px;display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.icard .flag{font-size:1.5rem}
.icard h3{font-family:var(--serif);font-size:1.4rem;font-weight:600;color:var(--navy);letter-spacing:-.01em}
.icard .cov{font-size:.82rem;color:var(--gold-2);font-weight:600;margin-top:3px}
.icard .thumb{padding:6px 20px 4px;height:74px}
.icard .thumb img{height:64px;width:100%;object-fit:contain}
.icard p{padding:0 24px;color:var(--muted);font-size:.94rem;flex:1}
.icard .foot{padding:16px 24px 22px;display:flex;gap:10px;align-items:center}
.icard .go{color:var(--navy);font-weight:600;font-size:.92rem}
.icard .go:hover{color:var(--gold-2)}
.tag{display:inline-block;font-size:.72rem;font-weight:600;padding:3px 9px;border-radius:20px;background:var(--bg-soft);color:var(--muted);border:1px solid var(--line)}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px}
.step .num{width:38px;height:38px;border-radius:10px;background:var(--navy);color:var(--gold);
  font-family:var(--serif);font-weight:600;display:grid;place-items:center;margin-bottom:16px}
.step h4{font-size:1.12rem;color:var(--navy);margin-bottom:8px}
.step p{color:var(--muted);font-size:.94rem}

/* ---------- research ---------- */
.papers{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.paper{background:#fff;border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:12px;padding:24px}
.paper .st{font-size:.74rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--gold-2)}
.paper h4{font-family:var(--serif);font-size:1.22rem;color:var(--navy);margin:8px 0 6px;line-height:1.25}
.paper .meta{font-size:.85rem;color:var(--muted);margin-bottom:12px}
.paper .lnk{font-size:.88rem;font-weight:600;color:var(--navy)}
.paper .lnk:hover{color:var(--gold-2)}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(160deg,#0f2a47,#102f56);color:#fff;border-radius:20px;padding:52px;text-align:center}
.cta-band h2{font-family:var(--serif);font-weight:600;font-size:2rem;margin-bottom:12px}
.cta-band p{color:#c6d4e6;max-width:52ch;margin:0 auto 26px}

/* ---------- footer ---------- */
.ftr{background:var(--navy);color:#b9c8dc;padding:56px 0 30px;font-size:.92rem}
.ftr .grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px;margin-bottom:34px}
.ftr h5{color:#fff;font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px}
.ftr a{display:block;padding:5px 0;color:#b9c8dc}
.ftr a:hover{color:var(--gold)}
.ftr .brand{color:#fff;font-size:1.3rem;margin-bottom:10px}
.ftr .brand b{color:var(--gold)}
.ftr .bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#8399b4;font-size:.85rem}

/* ---------- data center specific ---------- */
.picker{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:26px;display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin-bottom:40px}
.picker label{font-weight:600;color:var(--navy)}
.picker select{flex:1;min-width:240px;padding:13px 16px;border:1px solid var(--line-2);border-radius:11px;
  font-family:var(--sans);font-size:1rem;color:var(--ink);background:#fff;cursor:pointer}
.picker select:focus{outline:2px solid var(--gold);border-color:var(--gold)}
.dscard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:28px;margin-bottom:22px;scroll-margin-top:90px}
.dscard h3{font-family:var(--serif);font-size:1.55rem;color:var(--navy);display:flex;align-items:center;gap:10px}
.dscard .cov{color:var(--gold-2);font-weight:600;font-size:.86rem;margin:4px 0 14px}
.dscard p{color:var(--muted);margin-bottom:18px;max-width:70ch}
.dl-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:8px}
.dl{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border:1px solid var(--line-2);
  border-radius:10px;font-size:.9rem;font-weight:500;color:var(--navy);background:var(--bg-soft);transition:.15s}
.dl:hover{border-color:var(--navy);background:#fff;transform:translateY(-1px)}
.dl b{color:var(--gold-2)}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .cards,.papers{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .ftr .grid{grid-template-columns:1fr}
  .nav{display:none}
  .nav.open{display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);padding:12px;align-items:stretch}
  .menu-btn{display:grid;place-items:center;width:42px;height:42px;border:1px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;font-size:1.2rem}
  .navitem .dropdown{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;min-width:0;padding:4px 0 4px 12px}
}

/* ---------- motion: count-up stats + reveal on scroll ---------- */
.stats .stat{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.stats.dh-in .stat{opacity:1;transform:none}
.stats.dh-in .stat:nth-child(2){transition-delay:.08s}
.stats.dh-in .stat:nth-child(3){transition-delay:.16s}
.stats.dh-in .stat:nth-child(4){transition-delay:.24s}
.stats.dh-in .stat:nth-child(5){transition-delay:.32s}
.stats .stat .n{font-variant-numeric:tabular-nums}
.dh-reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.dh-reveal-in{opacity:1;transform:none}
.cards .icard:nth-child(2),.steps .step:nth-child(2),.papers .paper:nth-child(2){transition-delay:.08s}
.cards .icard:nth-child(3){transition-delay:.16s}
.cards .icard:nth-child(4){transition-delay:.24s}
.steps .step:nth-child(3){transition-delay:.16s}
@media(prefers-reduced-motion:reduce){.stats .stat,.dh-reveal{opacity:1!important;transform:none!important;transition:none!important}}

/* ---------- methodology step hover ---------- */
.steps .step{transition:opacity .5s ease, transform .3s ease, box-shadow .28s ease, border-color .28s ease;position:relative;overflow:hidden}
.steps .step::before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:linear-gradient(90deg,#c9a227,#e6c976);transform:scaleX(0);transform-origin:left;transition:transform .35s ease}
.steps .step:hover{transform:translateY(-7px);box-shadow:0 20px 44px rgba(16,42,71,.14);border-color:#e3d19a}
.steps .step:hover::before{transform:scaleX(1)}
.steps .step .num{transition:background .3s ease,color .3s ease,transform .35s cubic-bezier(.34,1.56,.64,1)}
.steps .step:hover .num{background:#c9a227;color:#0f2a47;transform:scale(1.08) rotate(-4deg)}
.steps .step h4{transition:color .25s ease}
.steps .step:hover h4{color:#b3901f}
@media(prefers-reduced-motion:reduce){.steps .step,.steps .step .num,.steps .step::before{transition:none!important}}

/* ---------- collaborate page ---------- */
.ccards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.ccard{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 24px;transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease}
.ccard:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--line-2)}
.cico{width:46px;height:46px;border-radius:12px;background:var(--navy);display:grid;place-items:center;margin-bottom:16px}
.cico svg{width:24px;height:24px}
.ccard h3{font-family:var(--serif);font-size:1.18rem;color:var(--navy);font-weight:600;margin-bottom:6px;line-height:1.22}
.ccard .ex{font-size:.79rem;color:var(--gold-2);font-weight:600;margin-bottom:10px;line-height:1.45}
.ccard p{color:var(--muted);font-size:.92rem}
.ways{display:flex;flex-wrap:wrap;gap:12px}
.way{display:inline-flex;align-items:center;gap:9px;background:#fff;border:1px solid var(--line);border-radius:30px;padding:11px 18px;font-weight:600;font-size:.9rem;color:var(--navy);transition:.18s}
.way:hover{border-color:var(--gold);transform:translateY(-2px)}
.way .d{width:8px;height:8px;border-radius:50%;background:var(--gold)}
.brings{display:grid;grid-template-columns:repeat(3,1fr);gap:18px 22px}
.bring{display:flex;gap:12px;align-items:flex-start}
.bring .ck{color:#fff;background:var(--gold-2);width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:.75rem;flex:0 0 auto;margin-top:2px}
.bring b{color:var(--navy);display:block;font-size:.98rem;margin-bottom:2px}
.bring span span{color:var(--muted);font-size:.88rem}
.collab-form{display:grid;grid-template-columns:1fr 1fr;gap:14px;max-width:640px;margin:24px auto 0;text-align:left}
.collab-form .full{grid-column:1 / -1}
.collab-form label{display:block;font-size:.8rem;color:#c6d4e6;margin-bottom:5px;font-weight:500}
.collab-form input,.collab-form select,.collab-form textarea{width:100%;padding:12px 14px;border-radius:10px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.08);color:#fff;font-family:var(--sans);font-size:.95rem}
.collab-form input::placeholder,.collab-form textarea::placeholder{color:#8399b4}
.collab-form input:focus,.collab-form select:focus,.collab-form textarea:focus{outline:2px solid var(--gold);border-color:var(--gold)}
.collab-form select option{color:#0f2a47}
@media(max-width:820px){.ccards,.brings{grid-template-columns:1fr}.collab-form{grid-template-columns:1fr}}