:root{
  --bg:#0b0f17;
  --panel:#0f172a;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --border:rgba(255,255,255,.10);
  --accent:#7c3aed;
  --accent2:#22c55e;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;color:var(--text);background:radial-gradient(1200px 700px at 25% 0%, rgba(124,58,237,.25), transparent 55%), radial-gradient(900px 600px at 90% 10%, rgba(34,197,94,.18), transparent 50%), var(--bg);}
a{color:inherit;text-decoration:none}
.container{max-width:1100px;margin:0 auto;padding:0 20px}
.nav{position:sticky;top:0;z-index:50;background:rgba(11,15,23,.80);backdrop-filter:saturate(160%) blur(10px);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.3px}
.brand-mark{width:28px;height:28px;border-radius:10px;background:linear-gradient(135deg, rgba(124,58,237,1), rgba(34,197,94,1));box-shadow:var(--shadow)}
.brand span{font-size:16px}
.nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.nav-links a{color:var(--muted);font-size:14px}
.nav-links a:hover{color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--border);background:rgba(255,255,255,.04);padding:10px 14px;border-radius:12px;font-weight:600;font-size:14px}
.btn:hover{border-color:rgba(255,255,255,.18);background:rgba(255,255,255,.06)}
.btn-primary{background:linear-gradient(135deg, rgba(124,58,237,.95), rgba(34,197,94,.85));border-color:transparent;color:#0b0f17}
.btn-primary:hover{filter:saturate(110%) brightness(1.02)}
.hero{padding:72px 0 28px}
.kicker{display:inline-flex;align-items:center;gap:8px;padding:6px 10px;border-radius:999px;border:1px solid var(--border);background:rgba(255,255,255,.03);color:var(--muted);font-size:13px}
.h1{font-size:44px;line-height:1.08;margin:14px 0 10px;letter-spacing:-.6px}
.sub{color:var(--muted);font-size:18px;line-height:1.6;max-width:900px;margin:0}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.grid{display:grid;gap:14px}
.grid-3{grid-template-columns:repeat(3, minmax(0, 1fr))}
.grid-2{grid-template-columns:repeat(2, minmax(0, 1fr))}
@media (max-width:900px){.grid-3{grid-template-columns:1fr}.grid-2{grid-template-columns:1fr}.h1{font-size:36px}}
.card{border:1px solid var(--border);background:rgba(255,255,255,.03);border-radius:18px;padding:18px;box-shadow:0 0 0 rgba(0,0,0,0)}
.card h3{margin:2px 0 8px;font-size:16px}
.card p{margin:0;color:var(--muted);line-height:1.6}
.section{padding:26px 0 54px}
.section h2{font-size:22px;margin:0 0 14px}
.hr{height:1px;background:var(--border);margin:18px 0}
.badge{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);border:1px solid var(--border);padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.02)}
.footer{padding:34px 0 60px;border-top:1px solid var(--border);color:var(--muted);font-size:13px}
.small{font-size:13px;color:var(--muted);line-height:1.7}
.form{display:grid;gap:12px;max-width:720px}
.field{display:grid;gap:6px}
label{font-size:13px;color:var(--muted)}
input,select,textarea{
  background:rgba(255,255,255,.03);
  border:1px solid var(--border);
  color:var(--text);
  padding:12px 12px;
  border-radius:12px;
  outline:none;
}
input:focus,select:focus,textarea:focus{border-color:rgba(124,58,237,.7)}
.note{font-size:12px;color:var(--muted)}
.callout{border:1px solid rgba(124,58,237,.35);background:rgba(124,58,237,.08);padding:14px 14px;border-radius:16px}
.callout strong{color:var(--text)}
ol.steps{margin:0;padding-left:20px;color:var(--muted);line-height:1.7}

option{color:#0b0f17;background:#ffffff;}

.select-wrap{position:relative}
.select-wrap:after{
  content:"▾";
  position:absolute;
  right:12px;
  top:50%;
  transform:translateY(-50%);
  color:var(--muted);
  pointer-events:none;
  font-size:14px;
}
select{padding-right:34px}

/* CFO/CTO mode toggle */
.mode-bar{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-top:18px}
.mode-title{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px}
.toggle{display:inline-flex;align-items:center;gap:10px;border:1px solid var(--border);background:rgba(255,255,255,.03);padding:8px 10px;border-radius:999px}
.switch{width:44px;height:24px;border-radius:999px;background:rgba(255,255,255,.10);position:relative;cursor:pointer;border:1px solid var(--border)}
.knob{width:20px;height:20px;border-radius:999px;background:rgba(229,231,235,.95);position:absolute;top:1px;left:1px;transition:transform .18s ease}
.switch[data-mode="cto"] .knob{transform:translateX(20px)}
.pill{font-size:12px;color:var(--muted)}
.pill strong{color:var(--text)}
.mode-tag{display:inline-flex;align-items:center;gap:8px}
.mode-tag .badge{margin:0}

/* simple chart container */
.chart{border:1px solid var(--border);background:rgba(255,255,255,.02);border-radius:16px;padding:14px}
.chart svg{width:100%;height:180px;display:block}
.stat{display:flex;align-items:baseline;justify-content:space-between;gap:10px}
.stat .value{font-size:28px;font-weight:800}
.stat .delta{font-size:12px;color:var(--muted)}
.kpi-grid{display:grid;gap:14px;grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:900px){.kpi-grid{grid-template-columns:1fr}}
.hidden{display:none !important}

/* architecture overlay */
.arch-wrap{position:relative}
.arch-img{width:100%;border-radius:12px;display:block}
.arch-overlay{position:absolute;left:0;top:0;width:100%;height:100%}
.arch-hotspot{fill:rgba(124,58,237,.10);stroke:rgba(124,58,237,.55);stroke-width:2;cursor:pointer}
.arch-hotspot:hover{fill:rgba(34,197,94,.12);stroke:rgba(34,197,94,.65)}
.arch-label{font-size:12px;fill:rgba(229,231,235,.9)}

/* Causal stack clickable cards */
.causal-box{cursor:pointer; user-select:none; min-width:210px}
.causal-box:hover{border-color:rgba(34,197,94,.35); background:rgba(34,197,94,.06)}
.causal-box:focus{outline:2px solid rgba(124,58,237,.6); outline-offset:2px}
.causal-box p{color:var(--muted); margin:0}