/* SigmaSphere Knowledge — shared theme */
*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#0d2a2e; --bg-2:#0a2024; --bg-3:#102f33;
  --ink:#e9e2d2; --ink-dim:#a9b3b1; --line:rgba(233,226,210,.12);
  --gold:#c9a96a; --gold-2:#b89455;
  --cta:#1f6b6e; --cta-2:#27858a;
  --serif:"Playfair Display",Georgia,serif;
  --sans:"Inter",system-ui,-apple-system,sans-serif;
  --max:1200px;
}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 28px}

/* Header — off-white */
.site-header{position:sticky;top:0;z-index:50;background:#f4ecdc;backdrop-filter:blur(10px);border-bottom:1px solid rgba(13,42,46,.1)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 28px;max-width:var(--max);margin:0 auto;gap:24px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{height:52px;width:auto}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0}
.nav-links a{font-size:14px;color:#0d2a2e;opacity:.85;transition:opacity .2s}
.nav-links a:hover,.nav-links a.active{opacity:1;color:var(--cta-2)}
.cta-pill{display:inline-block;background:var(--cta);color:#fff;padding:10px 22px;border-radius:999px;font-size:14px;font-weight:500;transition:background .2s}
.cta-pill:hover{background:var(--cta-2)}
.nav-toggle{display:none;background:none;border:0;color:#0d2a2e;font-size:24px;cursor:pointer}

/* Eyebrow / headings */
.eyebrow{display:inline-block;font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);margin-bottom:18px}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.1;margin:0 0 18px}
h1{font-size:clamp(40px,5.5vw,72px)}
h2{font-size:clamp(32px,4vw,52px)}
h3{font-size:22px;font-family:var(--sans);font-weight:600}
.gold{color:var(--gold)}
.lede{font-size:18px;color:var(--ink-dim);max-width:620px}

/* Sections */
section{padding:96px 0}
.section-head{max-width:760px;margin-bottom:56px}

/* Hero */
.hero{position:relative;padding:120px 0 100px;overflow:hidden;background:linear-gradient(120deg,#0a2024 0%,#0d2a2e 60%,#102f33 100%)}
.hero::before{content:"";position:absolute;inset:0;background:url("hero-bg.jpg") center/cover no-repeat;opacity:.18;mix-blend-mode:luminosity}
.hero .container{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.tag{display:inline-block;padding:6px 14px;border:1px solid var(--gold);border-radius:999px;font-size:12px;color:var(--gold);letter-spacing:.08em}
.hero h1 .gold{display:block;font-style:italic}
.hero-ctas{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.btn{display:inline-block;padding:14px 28px;border-radius:999px;font-size:15px;font-weight:500;transition:all .2s;cursor:pointer;border:0}
.btn-primary{background:var(--cta);color:#fff}
.btn-primary:hover{background:var(--cta-2)}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}

/* Approach card */
.approach-card{background:rgba(10,32,36,.7);border:1px solid var(--line);border-radius:18px;padding:34px;backdrop-filter:blur(6px)}
.approach-card h4{font-family:var(--sans);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);margin:0 0 24px;border-bottom:1px solid var(--line);padding-bottom:14px}
.approach-step{display:grid;grid-template-columns:42px 1fr;gap:18px;padding:14px 0;border-bottom:1px solid var(--line)}
.approach-step:last-child{border-bottom:0}
.approach-step .num{width:42px;height:42px;border-radius:10px;background:rgba(201,169,106,.12);color:var(--gold);display:grid;place-items:center;font-family:var(--serif);font-size:18px}
.approach-step h5{margin:0 0 4px;font-size:16px;font-weight:600}
.approach-step p{margin:0;font-size:14px;color:var(--ink-dim)}

/* Stats */
.stats{background:var(--bg-2);padding:60px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
.stat .n{font-family:var(--serif);font-size:54px;color:var(--gold);line-height:1}
.stat .l{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-dim);margin-top:10px}

/* Cards / grids */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.card{background:var(--bg-2);border:1px solid var(--line);border-radius:16px;padding:30px;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-3px);border-color:var(--gold)}
.card .ico{font-size:28px;margin-bottom:14px}
.card .kicker{font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);margin-bottom:10px}
.card h3{margin-bottom:10px}
.card p{color:var(--ink-dim);font-size:15px;margin:0 0 16px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chip{font-size:12px;padding:5px 11px;border:1px solid var(--line);border-radius:999px;color:var(--ink-dim)}

/* About split */
.about-split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-split img{border-radius:18px}
.formula{margin-top:48px;padding:36px;background:var(--bg-2);border-left:3px solid var(--gold);border-radius:6px}
.formula .eq{font-family:var(--serif);font-size:40px;color:var(--gold);margin-bottom:14px}

/* Numbered list (industries) */
.numbered{list-style:none;padding:0;margin:0}
.numbered li{display:grid;grid-template-columns:90px 1fr 2fr;gap:24px;align-items:baseline;padding:26px 0;border-bottom:1px solid var(--line)}
.numbered .nn{font-family:var(--serif);font-size:32px;color:var(--gold)}
.numbered h4{margin:0;font-size:22px;font-family:var(--serif);font-weight:500}
.numbered p{margin:0;color:var(--ink-dim);font-size:15px}

/* Compare (approach page) */
.compare{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:40px}
.compare > div{padding:30px;border-radius:14px;border:1px solid var(--line)}
.compare .old{background:var(--bg-2)}
.compare .new{background:rgba(201,169,106,.06);border-color:rgba(201,169,106,.3)}
.compare h4{font-family:var(--sans);font-size:12px;letter-spacing:.2em;text-transform:uppercase;margin:0 0 16px}
.compare .old h4{color:var(--ink-dim)}
.compare .new h4{color:var(--gold)}
.compare ul{padding-left:18px;margin:0}
.compare li{margin:8px 0;color:var(--ink-dim)}
.compare .new li{color:var(--ink)}

/* Project case */
.case{padding:30px;background:var(--bg-2);border:1px solid var(--line);border-radius:16px}
.case .ba{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:18px 0;padding:16px;background:var(--bg-3);border-radius:10px}
.case .ba div span{display:block;font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--ink-dim)}
.case .ba div strong{display:block;font-family:var(--serif);font-size:20px;color:var(--gold);margin-top:6px}

/* Contact form */
.contact-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:60px;align-items:start}
.form{background:var(--bg-2);border:1px solid var(--line);border-radius:18px;padding:36px}
.form label{display:block;font-size:13px;color:var(--ink-dim);margin:14px 0 6px}
.form input,.form select,.form textarea{width:100%;padding:12px 14px;background:var(--bg-3);border:1px solid var(--line);border-radius:8px;color:var(--ink);font-family:inherit;font-size:14px}
.form input:focus,.form select:focus,.form textarea:focus{outline:0;border-color:var(--gold)}
.form textarea{min-height:120px;resize:vertical}
.form .btn{margin-top:22px;width:100%}
.hidden{position:absolute;left:-9999px}

/* Book page */
.book-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:60px;align-items:center}
.book-cover{aspect-ratio:3/4;background:linear-gradient(135deg,#0a2024,#1f6b6e);border:1px solid var(--gold);border-radius:14px;display:grid;place-items:center;padding:40px;text-align:center}
.book-cover .title{font-family:var(--serif);font-size:36px;color:var(--gold);line-height:1.1}
.book-cover .sub{font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--ink-dim);margin-top:14px}
.book-toc{list-style:none;padding:0;margin:24px 0 32px}
.book-toc li{padding:12px 0;border-bottom:1px solid var(--line);display:flex;gap:14px}
.book-toc li::before{content:"→";color:var(--gold)}

/* Teasers (home) */
.teaser-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:40px}
.teaser{padding:30px;background:var(--bg-2);border:1px solid var(--line);border-radius:14px;transition:border-color .2s}
.teaser:hover{border-color:var(--gold)}
.teaser h3{margin:0 0 8px;font-family:var(--serif);font-size:24px}
.teaser p{color:var(--ink-dim);margin:0 0 14px;font-size:14px}
.teaser .arrow{color:var(--gold);font-size:13px;letter-spacing:.1em;text-transform:uppercase}

/* Footer */
.site-footer{background:#f4ecdc;border-top:1px solid rgba(13,42,46,.1);padding:70px 0 30px;margin-top:80px;color:#0d2a2e}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.footer-grid h5{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--cta);margin:0 0 16px}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin:8px 0;font-size:14px;color:#3a4f52}
.footer-grid a{color:#0d2a2e}
.footer-grid a:hover{color:var(--cta-2)}
.footer-grid p{color:#3a4f52;font-size:14px;margin:10px 0}
.site-footer .gold{color:var(--cta-2)!important}
.foot-bot{border-top:1px solid rgba(13,42,46,.12);padding-top:20px;display:flex;justify-content:space-between;font-size:13px;color:#3a4f52;flex-wrap:wrap;gap:10px}

/* About page — lighter section so transparent logo is visible */
.about-section{background:#f4ecdc;color:#0d2a2e}
.about-section .lede,.about-section p{color:#2a3e41}
.about-section .formula{background:#fff;border-left-color:var(--cta-2)}
.about-section .formula p{color:#2a3e41}
.about-section img{background:transparent}
.about-section h2,.about-section h3{color:#0d2a2e}
.about-section .gold{color:var(--cta-2)}
.about-section .chip{background:rgba(31,107,110,.1);border-color:rgba(31,107,110,.3);color:#0d2a2e}

/* Responsive */
@media (max-width:900px){
  .nav-toggle{display:block}
  .nav-links{position:absolute;top:100%;right:0;left:0;background:#f4ecdc;flex-direction:column;align-items:flex-start;padding:20px 28px;gap:14px;border-bottom:1px solid rgba(13,42,46,.1);display:none}
  .nav-links.open{display:flex}
  .hero .container,.about-split,.contact-grid,.book-grid{grid-template-columns:1fr;gap:40px}
  .grid-2,.grid-3,.grid-4,.teaser-grid,.compare,.stats-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:30px}
  .numbered li{grid-template-columns:60px 1fr;gap:14px}
  .numbered li p{grid-column:2}
  section{padding:64px 0}
  .footer-grid{grid-template-columns:1fr 1fr}
}