:root{
  --navy:#034a94;
  --navy-deep:#022f5e;
  --sky:#16a9e0;
  --sky-soft:#e7f4fb;
  --ink:#16202e;
  --body:#43586c;
  --muted:#6b7d8f;
  --line:#e2e9f0;
  --bg:#f6f9fc;
  --card:#ffffff;
  --radius:16px;
  --shadow:0 1px 2px rgba(16,32,46,.04), 0 8px 24px rgba(16,32,46,.06);
  --shadow-hover:0 12px 32px rgba(3,74,148,.12);
  --maxw:1120px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--body);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.5rem}

/* ---------- Header ---------- */
.header{
  position:sticky;top:0;z-index:1000;
  background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.nav__logo{display:flex;align-items:center;gap:.65rem;font-weight:700;color:var(--ink)}
.nav__logo img{height:38px;width:auto}
.nav__logo span{font-size:1.05rem;letter-spacing:-.01em}
.nav__logo small{display:block;font-size:.7rem;font-weight:500;color:var(--muted);letter-spacing:.01em}
.nav__list{display:flex;align-items:center;gap:.2rem;list-style:none}
.nav__link{
  display:block;padding:.5rem .8rem;border-radius:8px;
  font-size:.92rem;font-weight:500;color:var(--body);
  transition:color .2s,background .2s;
}
.nav__link:hover,.nav__link.active{color:var(--navy);background:var(--sky-soft)}
.nav__toggle,.nav__close{display:none;font-size:1.5rem;color:var(--navy);cursor:pointer;background:none;border:none}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  background:var(--navy);color:#fff;
  padding:.8rem 1.5rem;border-radius:10px;
  font-weight:600;font-size:.95rem;
  box-shadow:0 6px 18px rgba(3,74,148,.18);
  transition:transform .2s,box-shadow .2s,background .2s;
}
.btn:hover{background:var(--navy-deep);transform:translateY(-2px);box-shadow:0 10px 24px rgba(3,74,148,.26)}
.btn--ghost{
  background:transparent;color:var(--navy);
  border:1.5px solid var(--line);box-shadow:none;
}
.btn--ghost:hover{background:var(--sky-soft);border-color:var(--sky);transform:translateY(-2px)}

/* ---------- Sections ---------- */
.section{padding:5.5rem 0}
.section__eyebrow{
  display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;color:var(--sky);margin-bottom:.6rem;
}
.section__title{font-size:2rem;font-weight:700;color:var(--ink);letter-spacing:-.02em;margin-bottom:1rem}
.section__lead{max-width:680px;color:var(--muted);font-size:1.05rem}

/* ---------- Hero ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(1200px 500px at 100% -10%, rgba(22,169,224,.10), transparent 60%),
    linear-gradient(180deg,#ffffff 0%, var(--bg) 100%);
  border-bottom:1px solid var(--line);
}
.hero__inner{display:grid;grid-template-columns:1.25fr .75fr;gap:3rem;align-items:center;padding:5rem 0 5.5rem;position:relative;z-index:1}
.hero__logo{width:74px;height:74px;margin-bottom:1.4rem}
.hero__tag{
  display:inline-block;font-size:.8rem;font-weight:600;color:var(--navy);
  background:var(--sky-soft);border:1px solid #cfe8f6;
  padding:.35rem .8rem;border-radius:999px;margin-bottom:1.4rem;
}
.hero h1{font-size:3rem;line-height:1.08;letter-spacing:-.03em;color:var(--ink);margin-bottom:.4rem;font-weight:800}
.hero h1 .accent{color:var(--navy);font-style:italic}
.hero__sub{font-size:1.25rem;font-weight:600;color:var(--sky);margin-bottom:1.1rem}
.hero__desc{font-size:1.08rem;color:var(--body);max-width:560px;margin-bottom:2rem}
.hero__actions{display:flex;gap:.9rem;flex-wrap:wrap;margin-bottom:1.6rem}
.hero__social{display:flex;gap:.4rem;flex-wrap:wrap}
.hero__social a{
  width:42px;height:42px;display:grid;place-items:center;border-radius:10px;
  border:1px solid var(--line);color:var(--navy);font-size:1.2rem;background:#fff;
  transition:all .2s;
}
.hero__social a:hover{background:var(--sky-soft);border-color:var(--sky);transform:translateY(-2px)}
.hero__panel{
  background:#fff;border:1px solid var(--line);border-radius:20px;padding:1.8rem;
  box-shadow:var(--shadow);
}
.hero__panel h4{font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:1rem}
.hero__stats{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem}
.hero__stat .n{font-size:1.7rem;font-weight:800;color:var(--navy);line-height:1}
.hero__stat .l{font-size:.85rem;color:var(--muted);margin-top:.3rem}
.hero__deco{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:0;opacity:.55}
.hero__illu{width:100%;height:auto;margin-bottom:1.6rem;display:block}
.hero__illu .pulse{animation:pulse 3s ease-in-out infinite}
.hero__illu .pulse2{animation:pulse 3s ease-in-out infinite .8s}
.hero__illu .pulse3{animation:pulse 3s ease-in-out infinite 1.6s}
@keyframes pulse{0%,100%{opacity:.35}50%{opacity:1}}
.hero__illu .dash{stroke-dasharray:6 8;animation:flow 2.4s linear infinite}
@keyframes flow{to{stroke-dashoffset:-28}}

/* ---------- Approach ---------- */
.approach{position:relative;overflow:hidden;background:linear-gradient(180deg,var(--bg),#fff)}
.approach__grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:3.5rem;align-items:center;position:relative;z-index:1}
.approach h2 .accent{color:var(--navy);font-style:italic}
.approach__list{list-style:none;margin-top:1.6rem;display:grid;gap:1rem}
.approach__list li{display:flex;gap:.8rem;align-items:flex-start;font-size:1rem;color:var(--body)}
.approach__list i{color:var(--sky);font-size:1.25rem;margin-top:.1rem;flex-shrink:0}
.flow{position:relative;padding-left:.5rem}
.flow__step{
  position:relative;display:flex;gap:1.1rem;align-items:flex-start;
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:1.1rem 1.3rem;box-shadow:var(--shadow);margin-bottom:1.1rem;
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.flow__step:last-child{margin-bottom:0}
.flow__step:hover{transform:translateX(4px);box-shadow:var(--shadow-hover);border-color:#cfe2f0}
.flow__node{
  width:48px;height:48px;flex-shrink:0;border-radius:12px;display:grid;place-items:center;
  color:#fff;font-size:1.35rem;background:linear-gradient(135deg,var(--navy),var(--sky));
  box-shadow:0 6px 14px rgba(3,74,148,.22);
}
.flow__step:not(:last-child)::after{
  content:"";position:absolute;left:1.3rem;bottom:-1.1rem;
  width:2px;height:1.1rem;background:linear-gradient(var(--sky),transparent);
}
.flow__txt h3{font-size:1rem;color:var(--ink);margin-bottom:.15rem;font-weight:600}
.flow__txt p{font-size:.9rem;color:var(--muted)}

/* ---------- Decorative blob ---------- */
.blob{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;pointer-events:none;z-index:0}
.blob--sky{background:rgba(22,169,224,.22)}
.blob--navy{background:rgba(3,74,148,.14)}
.creds .wrap{position:relative;z-index:1}

/* ---------- Grid helpers ---------- */
.grid{display:grid;gap:1.5rem}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

/* ---------- Card ---------- */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.8rem;box-shadow:var(--shadow);
  transition:transform .2s,box-shadow .2s,border-color .2s;
  display:flex;flex-direction:column;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:#cfe2f0}
.card__icon{
  width:46px;height:46px;border-radius:12px;display:grid;place-items:center;
  background:var(--sky-soft);color:var(--navy);font-size:1.4rem;margin-bottom:1.1rem;
}
.card h3{font-size:1.12rem;color:var(--ink);margin-bottom:.55rem;font-weight:600}
.card p{font-size:.96rem;color:var(--body)}

/* ---------- About ---------- */
.about__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:start}
.about p + p{margin-top:1rem}
.about__domains{list-style:none;margin-top:1.4rem;display:grid;gap:.8rem}
.about__domains li{display:flex;gap:.7rem;align-items:flex-start;font-size:.98rem;color:var(--body)}
.about__domains i{color:var(--sky);font-size:1.2rem;margin-top:.15rem}
.about__aside{background:#fff;border:1px solid var(--line);border-radius:18px;padding:1.8rem;box-shadow:var(--shadow)}
.about__aside h4{font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:1.1rem}
.about__fact{padding:.9rem 0;border-bottom:1px solid var(--line)}
.about__fact:last-child{border-bottom:none}
.about__fact .k{font-size:.8rem;color:var(--muted)}
.about__fact .v{font-size:1rem;color:var(--ink);font-weight:600}

/* ---------- Credentials ---------- */
.creds{background:linear-gradient(180deg,#fff,var(--sky-soft))}
.cred{display:flex;gap:1rem;align-items:flex-start}
.cred i{color:var(--navy);font-size:1.5rem;background:#fff;border:1px solid var(--line);border-radius:10px;width:44px;height:44px;display:grid;place-items:center;flex-shrink:0}
.cred h3{font-size:1.02rem;color:var(--ink);margin-bottom:.2rem;font-weight:600}
.cred p{font-size:.92rem;color:var(--muted)}
.skills{margin-top:2.5rem}
.skills h4{font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:1rem}
.chips{display:flex;flex-wrap:wrap;gap:.6rem}
.chip{
  font-size:.85rem;font-weight:500;color:var(--navy);
  background:#fff;border:1px solid #cfe2f0;border-radius:999px;padding:.45rem .95rem;
}

/* ---------- Publications ---------- */
.pub{position:relative;overflow:hidden;padding:0;cursor:pointer}
.pub__img{width:100%;height:170px;object-fit:cover}
.pub__body{padding:1.4rem;display:flex;flex-direction:column;flex:1}
.pub__venue{font-size:.78rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--sky);margin-bottom:.5rem}
.pub__body h3{font-size:1.02rem;color:var(--ink);margin-bottom:.5rem;font-weight:600;line-height:1.4}
.pub__body p{font-size:.9rem;color:var(--muted);margin-bottom:1.1rem}
.pub__link{margin-top:auto;color:var(--navy);font-weight:600;font-size:.9rem;display:inline-flex;align-items:center;gap:.35rem;transition:gap .2s}
.pub:hover .pub__link,.post-card:hover .pub__link{gap:.55rem}
.scholar{text-align:center;margin-top:2.5rem}

/* ---------- Blog list ---------- */
.post-list{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.post-card{cursor:pointer}
.post-card__date{font-size:.78rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--sky);margin-bottom:.6rem;display:block}
.post-card h3{font-size:1.12rem;color:var(--ink);margin-bottom:.5rem;font-weight:600;line-height:1.4}
.post-card p{font-size:.95rem;color:var(--body);margin-bottom:1.1rem;flex:1}
.post-card .pub__link{margin-top:auto}

/* ---------- Page head (blog / post) ---------- */
.page-head{
  position:relative;overflow:hidden;
  background:radial-gradient(900px 400px at 90% -20%, rgba(22,169,224,.12), transparent 60%),linear-gradient(180deg,#fff,var(--bg));
  border-bottom:1px solid var(--line);padding:3.6rem 0 3rem;
}
.page-head__title{font-size:2.4rem;font-weight:800;color:var(--ink);letter-spacing:-.02em;margin:.4rem 0 .6rem}
.page-head__meta{color:var(--muted);font-size:.95rem}
.page-head__lead{color:var(--body);font-size:1.08rem;max-width:640px;margin-top:.4rem}

/* ---------- Post article ---------- */
.post{max-width:760px;margin:0 auto}
.post__content{font-size:1.08rem;color:var(--body)}
.post__content h2{font-size:1.6rem;color:var(--ink);margin:2.2rem 0 .8rem;font-weight:700;letter-spacing:-.01em}
.post__content h3{font-size:1.25rem;color:var(--ink);margin:1.8rem 0 .6rem;font-weight:600}
.post__content p{margin:0 0 1.2rem}
.post__content ul,.post__content ol{margin:0 0 1.2rem 1.3rem}
.post__content li{margin:.4rem 0}
.post__content a{color:var(--navy);font-weight:600;text-decoration:underline;text-decoration-color:rgba(3,74,148,.3)}
.post__content a:hover{text-decoration-color:var(--navy)}
.post__content img{border-radius:14px;margin:1.6rem 0;box-shadow:var(--shadow)}
.post__content blockquote{border-left:3px solid var(--sky);background:var(--sky-soft);padding:1rem 1.3rem;border-radius:0 12px 12px 0;margin:1.6rem 0;color:var(--ink)}
.post__content code{background:#eef3f8;border:1px solid var(--line);border-radius:6px;padding:.1rem .4rem;font-size:.92em;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.post__content pre{background:#0e2236;color:#e6f0fa;padding:1.2rem 1.4rem;border-radius:12px;overflow:auto;margin:1.6rem 0}
.post__content pre code{background:none;border:none;padding:0;color:inherit}
.post__repost{margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--line);color:var(--muted);font-size:.95rem}

/* ---------- Contact ---------- */
.contact{background:var(--navy);color:#fff}
.contact .section__eyebrow{color:#9ad6f1}
.contact .section__title{color:#fff}
.contact__grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:center}
.contact__lead{color:rgba(255,255,255,.82);font-size:1.05rem;max-width:460px}
.contact__card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);border-radius:18px;padding:2rem}
.contact__row{display:flex;gap:.9rem;align-items:center;padding:.7rem 0}
.contact__row i{font-size:1.3rem;color:#9ad6f1;width:34px}
.contact__row a,.contact__row span{color:#fff;font-size:1rem}
.contact__row a:hover{color:#9ad6f1}

/* ---------- Footer ---------- */
.footer{background:var(--navy-deep);color:#c7d6e6;padding:3rem 0 1.8rem}
.footer__top{display:flex;justify-content:space-between;align-items:center;gap:1.5rem;flex-wrap:wrap;padding-bottom:1.6rem;border-bottom:1px solid rgba(255,255,255,.12)}
.footer__logo{display:flex;align-items:center;gap:.6rem;color:#fff;font-weight:700}
.footer__logo img{height:34px}
.footer__nav{display:flex;gap:1.3rem;flex-wrap:wrap}
.footer__nav a{font-size:.92rem;color:#c7d6e6}
.footer__nav a:hover{color:#fff}
.footer__social{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap;padding:1.5rem 0 0}
.footer__social a{
  width:40px;height:40px;display:grid;place-items:center;border-radius:10px;
  border:1px solid rgba(255,255,255,.16);color:#c7d6e6;font-size:1.15rem;transition:all .2s;
}
.footer__social a:hover{color:#fff;border-color:var(--sky);background:rgba(22,169,224,.15);transform:translateY(-2px)}
.footer__social .sep{width:1px;height:24px;background:rgba(255,255,255,.16);margin:0 .35rem}
.footer__legal{padding-top:1.4rem;font-size:.85rem;color:#8fa6bd;line-height:1.7}
.footer__legal strong{color:#fff;font-weight:600}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.reveal.show{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .hero__inner,.about__grid,.contact__grid,.approach__grid{grid-template-columns:1fr;gap:2.5rem}
  .grid-3,.grid-4,.post-list{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:2.4rem}
}
@media (max-width:680px){
  .nav__toggle{display:block}
  .nav__menu{
    position:fixed;inset:0 0 0 auto;width:78%;max-width:320px;
    background:#fff;flex-direction:column;padding:5rem 1.5rem;
    box-shadow:-10px 0 40px rgba(0,0,0,.12);
    transform:translateX(100%);transition:transform .3s ease;z-index:1100;
  }
  .nav__menu.open{transform:translateX(0)}
  .nav__list{flex-direction:column;align-items:flex-start;gap:.3rem;width:100%}
  .nav__link{width:100%}
  .nav__close{display:block;position:absolute;top:1.3rem;right:1.3rem}
  .grid-2,.grid-3,.grid-4,.post-list{grid-template-columns:1fr}
  .section{padding:4rem 0}
  .hero h1{font-size:2.05rem}
  .page-head__title{font-size:1.9rem}
}