:root{
  /* dark theme = default */
  --bg:#0b1020; --bg2:#0f1629; --card:#141d33; --card2:#18233d;
  --ink:#e9eefb; --muted:#9fb0d0; --line:#24314f;
  --chip-ink:#cdd8ff; --on-accent:#0b1020; --shadow:rgba(0,0,0,.45);
  --accent:#6c8cff; --accent2:#49e1b0;
  --accent-rgb:108,140,255; --accent2-rgb:73,225,176;
  --maxw:1000px;
}
/* follow system when the visitor hasn't chosen, unless page is forced dark */
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"]){
    --bg:#f5f8fd; --bg2:#eaf0fa; --card:#ffffff; --card2:#f1f5fc;
    --ink:#131a2c; --muted:#54617d; --line:#dce4f1;
    --chip-ink:#2a3a73; --on-accent:#ffffff; --shadow:rgba(30,50,90,.12);
    --accent:#3a5bd0; --accent2:#0e9f73; --accent-rgb:58,91,208; --accent2-rgb:14,159,115;
  }
}
/* explicit light choice */
:root[data-theme="light"]{
  --bg:#f5f8fd; --bg2:#eaf0fa; --card:#ffffff; --card2:#f1f5fc;
  --ink:#131a2c; --muted:#54617d; --line:#dce4f1;
  --chip-ink:#2a3a73; --on-accent:#ffffff; --shadow:rgba(30,50,90,.12);
  --accent:#3a5bd0; --accent2:#0e9f73; --accent-rgb:58,91,208; --accent2-rgb:14,159,115;
}
/* accent palettes (override the accent pair only) */
:root[data-accent="green"]{ --accent:#38d39f; --accent2:#6c8cff; --accent-rgb:56,211,159; --accent2-rgb:108,140,255; }
:root[data-accent="crimson"]{ --accent:#ff5d73; --accent2:#ffb86b; --accent-rgb:255,93,115; --accent2-rgb:255,184,107; }
:root[data-accent="purple"]{ --accent:#a177ff; --accent2:#49e1b0; --accent-rgb:161,119,255; --accent2-rgb:73,225,176; }
/* darken low-contrast accents on light backgrounds for readable links */
:root[data-theme="light"][data-accent="green"]{ --accent:#0e8a66; --accent-rgb:14,138,102; }
@media (prefers-color-scheme: light){
  :root:not([data-theme="dark"])[data-accent="green"]{ --accent:#0e8a66; --accent-rgb:14,138,102; }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{overflow-x:hidden;max-width:100%}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  line-height:1.6; -webkit-font-smoothing:antialiased;
}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 16px}
a{color:var(--accent); text-decoration:none}
a:hover{text-decoration:underline}
.sr-only,.skip{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);border:0}
.skip:focus{position:fixed;top:8px;left:8px;width:auto;height:auto;background:var(--accent);color:#fff;padding:8px 14px;border-radius:8px;z-index:50}
h2{font-size:1.5rem;margin:48px 0 18px;letter-spacing:-.01em}
h3{margin:0;font-size:1.05rem}

/* Hero */
.hero{
  background:
    radial-gradient(1100px 500px at 80% -10%, rgba(var(--accent-rgb),.22), transparent 60%),
    radial-gradient(900px 500px at 0% 0%, rgba(var(--accent2-rgb),.14), transparent 55%),
    linear-gradient(180deg,var(--bg2),var(--bg));
  border-bottom:1px solid var(--line);
  padding:56px 0 44px;
}
.hero-inner{display:flex;gap:32px;align-items:center;flex-wrap:wrap}
.avatar{
  width:160px;height:160px;border-radius:50%;object-fit:cover;
  border:3px solid rgba(var(--accent-rgb),.5);
  box-shadow:0 10px 40px var(--shadow);flex:0 0 auto;
}
.hero-text{flex:1;min-width:280px}
.eyebrow{font-family:'JetBrains Mono',monospace;color:var(--accent2);font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;margin:0 0 6px}
h1{font-size:clamp(2.1rem,5vw,3.1rem);margin:0;letter-spacing:-.02em;line-height:1.05}
.role{font-size:1.15rem;color:var(--ink);font-weight:600;margin:10px 0 4px}
.tagline{color:var(--muted);margin:0 0 16px;max-width:52ch}
.cert-chips{list-style:none;display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:0 0 20px}
.cert-chips li{display:flex}
.cert-chips li a{
  font-family:'JetBrains Mono',monospace;font-size:.78rem;font-weight:600;
  background:rgba(var(--accent-rgb),.12);border:1px solid rgba(var(--accent-rgb),.35);
  color:var(--chip-ink);padding:5px 10px;border-radius:999px;transition:.15s;text-decoration:none;
}
.cert-chips li a:hover{background:rgba(var(--accent-rgb),.26);border-color:var(--accent);
  color:var(--ink);text-decoration:none;transform:translateY(-1px)}
.cta{display:flex;flex-wrap:wrap;gap:10px}
.btn{
  display:inline-block;padding:10px 18px;border-radius:10px;font-weight:600;font-size:.92rem;
  border:1px solid var(--line);background:var(--card);color:var(--ink);transition:.15s;
}
.btn:hover{text-decoration:none;transform:translateY(-1px);border-color:var(--accent)}
.btn.primary{background:linear-gradient(135deg,var(--accent),var(--accent2));border-color:transparent;color:var(--on-accent)}
.loc{color:var(--muted);font-size:.9rem;margin:18px 0 0}

/* Cards / sections */
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px 22px}
.summary{margin-top:40px;font-size:1.05rem}
.summary p{margin:0}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 14px;text-align:center}
.stat .num{display:block;font-size:1.9rem;font-weight:700;color:var(--accent2);font-family:'JetBrains Mono',monospace}
.stat .lbl{display:block;color:var(--muted);font-size:.82rem;margin-top:4px}

.item{border-left:2px solid var(--line);padding:0 0 4px 20px;margin:0 0 26px;position:relative}
.item::before{content:"";position:absolute;left:-7px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--bg)}
.item-head{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:baseline}
.when{font-family:'JetBrains Mono',monospace;font-size:.8rem;color:var(--accent2);white-space:nowrap}
.org{color:var(--muted);margin:4px 0 10px;font-weight:500}
.item ul{margin:0;padding-left:18px;color:var(--ink)}
.item li{margin:4px 0}

.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.grid2 .card h3{margin-bottom:8px;color:var(--chip-ink)}
.grid2 .card p{margin:0;color:var(--muted)}

.certs-note{color:var(--muted);margin:-6px 0 16px;font-size:.9rem}
.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.cert-group{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.cert-group h3{font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);font-family:'JetBrains Mono',monospace}
.cert-group ul{margin:10px 0 0;padding-left:18px;color:var(--ink)}
.cert-group li{margin:3px 0;font-size:.93rem}

.contact{background:linear-gradient(135deg,rgba(var(--accent-rgb),.12),rgba(var(--accent2-rgb),.08));border:1px solid var(--line);border-radius:16px;padding:32px;text-align:center;margin:52px 0 20px}
.contact h2{margin-top:0}
.contact p{color:var(--muted);margin:0 0 18px}
.contact .cta{justify-content:center}

footer{border-top:1px solid var(--line);margin-top:40px;padding:26px 0;color:var(--muted);font-size:.88rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
footer p{margin:0}

@media (max-width:720px){
  .stats{grid-template-columns:1fr 1fr}
  .grid2,.cert-grid{grid-template-columns:1fr}
  .hero-inner{flex-direction:column;justify-content:center;text-align:center}
  .cta,.cert-chips{justify-content:center}
  .hero-text{min-width:0;width:100%}
  h1{word-break:break-word}
}

/* ===== Theme switcher ===== */
.theme-bar{position:fixed;top:12px;right:12px;z-index:40;display:flex;gap:6px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:999px;padding:5px 7px;
  box-shadow:0 6px 20px var(--shadow)}
.theme-bar button{appearance:none;cursor:pointer;border:1px solid transparent;background:transparent;
  color:var(--muted);width:28px;height:28px;border-radius:50%;display:grid;place-items:center;
  font-size:14px;line-height:1;transition:.15s}
.theme-bar button:hover{color:var(--ink);background:rgba(var(--accent-rgb),.14)}
.theme-bar .mode{font-size:15px}
.theme-bar .sep{width:1px;height:18px;background:var(--line);margin:0 2px}
.theme-bar .sw{width:16px;height:16px;border-radius:50%;border:2px solid transparent}
.theme-bar .sw[aria-pressed="true"]{border-color:var(--ink)}
.theme-bar .sw.blue{background:#6c8cff}
.theme-bar .sw.green{background:#38d39f}
.theme-bar .sw.crimson{background:#ff5d73}
.theme-bar .sw.purple{background:#a177ff}
@media (max-width:520px){ .theme-bar{top:8px;right:8px;padding:4px 6px} .theme-bar .sw{width:14px;height:14px} }

/* ===== Print: clean light, hide controls ===== */
@media print{
  .theme-bar,.cta,.skip{display:none !important}
  :root{--bg:#fff;--bg2:#fff;--card:#fff;--ink:#111;--muted:#444;--line:#ccc;--shadow:transparent;--accent:#1f3a93;--accent2:#0e7a59;--accent-rgb:31,58,147;--accent2-rgb:14,122,89;--chip-ink:#1f3a93;--on-accent:#fff}
  .hero{background:#fff;padding:12px 0}
  body{font-size:11pt}
  a{color:var(--accent)}
}

/* clickable certification cards */
a.cert-group{display:block;text-decoration:none;color:inherit;position:relative;transition:.15s}
a.cert-group:hover{text-decoration:none;transform:translateY(-2px);border-color:var(--accent);
  box-shadow:0 8px 24px var(--shadow)}
a.cert-group h3{display:flex;align-items:center;justify-content:space-between;gap:8px}
a.cert-group .verify{font-family:'Inter',sans-serif;font-size:.68rem;font-weight:600;text-transform:none;
  letter-spacing:0;color:var(--accent);opacity:0;transition:.15s;white-space:nowrap}
a.cert-group:hover .verify{opacity:1}
a.cert-group ul{color:var(--ink)}
@media (hover:none){ a.cert-group .verify{opacity:.8} }

/* ===== Top nav ===== */
html{scroll-padding-top:68px}
.topnav{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topnav-inner{display:flex;align-items:center;justify-content:space-between;height:56px}
.brand{font-weight:700;font-size:1.02rem;color:var(--ink);letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand .dot{color:var(--accent)}
.navlinks{display:flex;gap:4px;align-items:center}
.navlinks a{color:var(--muted);font-size:.9rem;font-weight:500;padding:7px 11px;border-radius:8px;transition:.15s}
.navlinks a:hover{color:var(--ink);background:rgba(var(--accent-rgb),.12);text-decoration:none}
.navlinks .nav-cv{color:var(--accent);font-weight:600}
.navtoggle{display:none;appearance:none;background:transparent;border:1px solid var(--line);color:var(--ink);
  width:38px;height:38px;border-radius:9px;font-size:16px;cursor:pointer}
.theme-bar{top:66px}
@media (max-width:720px){
  .navtoggle{display:block}
  .navlinks{position:absolute;top:56px;left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;
    background:var(--bg2);border-bottom:1px solid var(--line);padding:8px 16px 14px;
    max-height:0;overflow:hidden;opacity:0;transition:.2s;pointer-events:none}
  .navlinks.open{max-height:360px;opacity:1;pointer-events:auto}
  .navlinks a{padding:10px 12px}
  .theme-bar{top:8px}
}

/* ===== Section head with side link ===== */
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.sec-link{font-size:.9rem;font-weight:600;color:var(--accent);white-space:nowrap}

/* ===== Media grid (videos / articles) ===== */
.media-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.media-card{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:14px;color:var(--ink);transition:.15s}
.media-card:hover{text-decoration:none;transform:translateY(-2px);border-color:var(--accent);box-shadow:0 8px 24px var(--shadow)}
.media-card .thumb{display:block;aspect-ratio:16/9;border-radius:10px;background-size:cover;background-position:center;
  background-color:var(--card2);position:relative;margin:-14px -14px 2px}
.media-card .thumb .play{position:absolute;inset:0;display:grid;place-items:center;font-size:30px;color:#fff;
  text-shadow:0 2px 10px rgba(0,0,0,.6)}
.media-card .thumb.noimg{display:grid;place-items:center}
.media-meta{display:flex;gap:8px;align-items:center}
.media-tag{font-family:'JetBrains Mono',monospace;font-size:.68rem;font-weight:600;color:var(--chip-ink);
  background:rgba(var(--accent-rgb),.14);border:1px solid rgba(var(--accent-rgb),.3);padding:2px 8px;border-radius:999px}
.media-date{font-size:.75rem;color:var(--muted)}
.media-title{font-weight:600;line-height:1.3}
.media-excerpt{font-size:.88rem;color:var(--muted);line-height:1.4}
.media-more{font-size:.82rem;font-weight:600;color:var(--accent);margin-top:auto}
.media-empty{grid-column:1/-1;display:flex;align-items:center;gap:10px;justify-content:center;text-align:center;
  color:var(--muted);background:var(--card);border:1px dashed var(--line);border-radius:14px;padding:30px 20px;font-size:.95rem}
.media-empty .pulse{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 rgba(var(--accent-rgb),.5);
  animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(var(--accent-rgb),.5)}70%{box-shadow:0 0 0 10px rgba(var(--accent-rgb),0)}100%{box-shadow:0 0 0 0 rgba(var(--accent-rgb),0)}}
@media (max-width:720px){ .media-grid{grid-template-columns:1fr} }
@media print{ .topnav,#videos,#articles{display:none !important} }

/* ===== Recognition & Speaking ===== */
.rec-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rec-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 18px 16px;
  position:relative;overflow:hidden;transition:.15s}
.rec-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent)}
.rec-card:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 8px 24px var(--shadow)}
.rec-year{display:inline-block;font-family:'JetBrains Mono',monospace;font-size:.7rem;font-weight:600;
  letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:8px}
.rec-card h3{font-size:1rem;line-height:1.3;margin:0 0 4px}
.rec-card p{margin:0;color:var(--muted);font-size:.9rem}
@media (max-width:720px){ .rec-grid{grid-template-columns:1fr} }

/* ===== Selected Engagements (NDA) ===== */
.sec-link.nda{color:var(--accent2);font-family:'JetBrains Mono',monospace;font-size:.8rem}
.eng-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:6px}
.eng-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px;
  position:relative;transition:.15s}
.eng-card:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 8px 24px var(--shadow)}
.eng-sector{display:inline-block;font-family:'JetBrains Mono',monospace;font-size:.68rem;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;color:var(--accent);background:rgba(var(--accent-rgb),.12);
  border:1px solid rgba(var(--accent-rgb),.3);padding:3px 9px;border-radius:999px;margin-bottom:10px}
.eng-card h3{font-size:1rem;line-height:1.3;margin:0 0 8px}
.eng-card ul{margin:0;padding-left:18px;color:var(--ink)}
.eng-card li{margin:3px 0;font-size:.92rem}
@media (max-width:720px){ .eng-grid{grid-template-columns:1fr} }