:root{
  --bg-a:#020817;
  --bg-b:#0f172a;
  --panel:rgba(15,23,42,.55);
  --panel-solid:#0f1729;
  --border:rgba(255,255,255,.09);
  --border-soft:rgba(255,255,255,.05);
  --text:#e9eefb;
  --text-dim:#94a3b8;
  --text-faint:#64748b;
  --accent:#2dd4bf;
  --accent-dim:rgba(45,212,191,.14);
  --grad-a:#3b82f6;
  --grad-b:#a855f7;
  --cta-gradient:linear-gradient(to right, var(--grad-a), var(--grad-b));
  --nav-scroll-bg:rgba(2,8,23,.78);
  --menu-bg:rgba(2,6,15,.98);
  --field-bg:rgba(255,255,255,.04);
  --row-bg:rgba(255,255,255,.03);
  --track-bg:rgba(255,255,255,.07);
  --radius-s:8px;
  --radius-m:14px;
  --radius-l:24px;
  --font-d:'Space Grotesk',ui-sans-serif,system-ui,sans-serif;
  --font-b:'Inter',ui-sans-serif,system-ui,sans-serif;
  --font-mono:'SFMono-Regular',Consolas,'Liberation Mono',Menlo,monospace;
  --maxw:1120px;
}

:root[data-theme="light"]{
  --bg-a:#f4f6fb;
  --bg-b:#e7ecf5;
  --panel:rgba(255,255,255,.6);
  --panel-solid:#ffffff;
  --border:rgba(15,23,42,.12);
  --border-soft:rgba(15,23,42,.06);
  --text:#12151f;
  --text-dim:#4c5566;
  --text-faint:#79839a;
  --accent:#0d9488;
  --accent-dim:rgba(13,148,136,.12);
  --nav-scroll-bg:rgba(244,246,251,.82);
  --menu-bg:rgba(244,246,251,.98);
  --field-bg:rgba(15,23,42,.03);
  --row-bg:rgba(15,23,42,.03);
  --track-bg:rgba(15,23,42,.08);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important;}
}
body{
  margin:0;
  background:linear-gradient(135deg, var(--bg-a) 0%, var(--bg-b) 100%);
  color:var(--text);
  font-family:var(--font-b);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
#bg-canvas{
  position:fixed; inset:0; z-index:-1; width:100%; height:100%; display:block;
  background:linear-gradient(135deg, var(--bg-a) 0%, var(--bg-b) 100%);
}
img{max-width:100%; display:block;}
a{color:inherit;}
h1,h2,h3,h4{font-family:var(--font-d); font-weight:600; margin:0; letter-spacing:-.01em;}
p{margin:0;}
ul{margin:0; padding:0; list-style:none;}
button,input,textarea{font-family:inherit;}

.skip-link{
  position:absolute; left:-999px; top:0; background:var(--accent); color:#04211c;
  padding:.7rem 1.2rem; border-radius:0 0 var(--radius-s) 0; z-index:200; font-weight:600;
}
.skip-link:focus{left:0;}
a:focus-visible, button:focus-visible, summary:focus-visible{
  outline:2px solid var(--accent); outline-offset:3px; border-radius:2px;
}

.wrap{max-width:var(--maxw); margin:0 auto; padding:0 1.5rem; position:relative; z-index:1;}

/* ---------- Reveal-on-scroll ---------- */
.reveal{opacity:0; transform:translateY(22px); transition:opacity .7s ease, transform .7s ease;}
.reveal.in-view{opacity:1; transform:translateY(0);}

/* ---------- Nav ---------- */
header.site-nav{
  position:fixed; top:0; left:0; right:0; z-index:100;
  border-bottom:1px solid transparent;
  transition:background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
}
header.site-nav.scrolled{
  background:var(--nav-scroll-bg); backdrop-filter:blur(12px); border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:var(--maxw); margin:0 auto; padding:0 1.5rem;
  height:68px; display:flex; align-items:center; justify-content:space-between; gap:1.2rem;
}
.brand{display:flex; align-items:center; gap:.6rem; font-family:var(--font-d); font-weight:600; font-size:1.02rem; text-decoration:none;}
.brand-mark{
  width:34px; height:34px; border-radius:9px; background:var(--cta-gradient); padding:2px;
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
  box-shadow:0 0 0 1px rgba(255,255,255,.08), 0 6px 16px -6px rgba(59,130,246,.5);
}
.brand-mark img{width:100%; height:100%; border-radius:7px; object-fit:cover; object-position:top;}
nav.links{display:flex; gap:1.8rem;}
nav.links a{
  font-size:.92rem; color:var(--text-dim); text-decoration:none; position:relative; padding:.3rem 0;
  transition:color .2s ease;
}
nav.links a::after{
  content:""; position:absolute; left:0; right:100%; bottom:-2px; height:1.5px; background:var(--accent);
  transition:right .25s ease;
}
nav.links a:hover, nav.links a.active{color:var(--text);}
nav.links a.active::after{right:0;}

.nav-side{display:flex; align-items:center; gap:1rem;}

.theme-toggle{
  display:inline-flex; align-items:center; justify-content:center;
  width:38px; height:38px; flex-shrink:0;
  border:1px solid var(--border); border-radius:999px;
  background:transparent; color:var(--text-dim); cursor:pointer;
  transition:color .2s ease, border-color .2s ease;
}
.theme-toggle:hover{color:var(--accent); border-color:var(--accent);}
.theme-toggle svg{width:16px; height:16px;}
.theme-toggle .icon-moon{display:none;}
:root[data-theme="light"] .theme-toggle .icon-sun{display:none;}
:root[data-theme="light"] .theme-toggle .icon-moon{display:block;}
.mobile-menu .theme-toggle{
  width:auto; height:auto; padding:.5rem 1rem; gap:.5rem; font-family:var(--font-b); font-size:.9rem;
}
.mobile-menu .theme-toggle::after{content:"Light theme";}
:root[data-theme="light"] .mobile-menu .theme-toggle::after{content:"Dark theme";}

.nav-toggle{display:none; background:none; border:1px solid var(--border); width:42px; height:42px; border-radius:var(--radius-s); cursor:pointer; color:var(--text); flex-shrink:0;}
.nav-toggle svg{width:18px; height:18px;}

.mobile-menu{
  position:fixed; inset:0; background:var(--menu-bg); z-index:99;
  display:flex; flex-direction:column; align-items:flex-start; justify-content:center; gap:1.6rem;
  padding:2rem 2rem; transform:translateY(-8px); opacity:0; pointer-events:none;
  transition:opacity .25s ease, transform .25s ease;
}
.mobile-menu.open{opacity:1; transform:translateY(0); pointer-events:auto;}
.mobile-menu a{font-family:var(--font-d); font-size:1.6rem; color:var(--text); text-decoration:none;}
.mobile-menu .close-btn{position:absolute; top:1.5rem; right:1.5rem; background:none; border:1px solid var(--border); width:42px; height:42px; border-radius:var(--radius-s); color:var(--text); cursor:pointer;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:.5rem;
  padding:.85rem 1.6rem; border-radius:999px; font-weight:600; font-size:.94rem;
  text-decoration:none; cursor:pointer; border:1px solid transparent; transition:transform .2s ease, filter .2s ease, border-color .2s ease;
}
.btn:hover{transform:translateY(-2px);}
.btn-primary{background:var(--cta-gradient); color:#fff;}
.btn-primary:hover{filter:brightness(1.1);}
.btn-ghost{border-color:var(--border); color:var(--text);}
.btn-ghost:hover{border-color:var(--accent); color:var(--accent);}

/* ---------- Hero ---------- */
.hero{
  position:relative; min-height:100svh; display:flex; align-items:center; justify-content:center;
  text-align:center; padding:140px 0 100px;
}
.hero-inner{max-width:760px; margin:0 auto;}
.kicker{
  display:inline-flex; align-items:center; gap:.5rem; justify-content:center;
  font-size:.85rem; color:var(--accent); font-weight:600; margin-bottom:1.3rem;
}
.kicker .dot{width:7px; height:7px; border-radius:50%; background:var(--accent); box-shadow:0 0 10px var(--accent);}
.hero h1{
  font-size:clamp(2.6rem, 7vw, 5rem); line-height:1.02; letter-spacing:-.02em; color:var(--text);
}
.hero-tagline{
  margin-top:1rem; font-family:var(--font-d); font-weight:600; color:var(--accent);
  font-size:clamp(1.1rem, 2.4vw, 1.5rem);
}
.role-rotator{
  height:1.6em; overflow:hidden; margin-top:1rem; font-family:var(--font-mono); font-weight:600;
  font-size:.98rem; color:var(--text-dim);
}
.rotator-cursor{display:inline-block; margin-left:2px; color:var(--accent); animation:cursorBlink 1s step-end infinite;}
@keyframes cursorBlink{0%,100%{opacity:1;} 50%{opacity:0;}}
.hero-desc{margin:1.5rem auto 0; max-width:56ch; color:var(--text-dim); font-size:1.03rem;}
.hero-cta{display:flex; gap:1rem; margin-top:2.2rem; flex-wrap:wrap; justify-content:center;}

.scroll-indicator{
  position:absolute; left:50%; bottom:36px; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; gap:10px;
  color:var(--text-faint); font-size:.75rem; letter-spacing:.08em; text-transform:uppercase;
}
.scroll-line{width:1px; height:34px; background:linear-gradient(var(--accent), transparent); animation:scrollPulse 1.8s ease-in-out infinite;}
@keyframes scrollPulse{0%,100%{opacity:.3;} 50%{opacity:1;}}

/* ---------- Section generic ---------- */
section{position:relative; padding:6.5rem 0; z-index:1;}
.section-head{max-width:640px; margin-bottom:3.2rem;}
.section-tag{font-size:.85rem; color:var(--accent); font-weight:600; margin-bottom:.7rem;}
.section-head h2{font-size:clamp(1.7rem, 3vw, 2.3rem); color:var(--text);}
.section-head p{color:var(--text-dim); margin-top:.9rem; font-size:1rem;}

.glass-card{
  background:var(--panel); backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border:1px solid var(--border); border-radius:var(--radius-m);
}

/* ---------- About ---------- */
.about-grid{display:grid; grid-template-columns:1.3fr .9fr; gap:3rem; align-items:start;}
.about-text p{color:var(--text-dim); font-size:1.04rem; margin-bottom:1.1rem;}
.about-text p:last-child{margin-bottom:0;}
.about-text strong{color:var(--text); font-weight:600;}
.fact-list{display:flex; flex-direction:column; gap:1rem;}
.fact-pill{
  display:flex; align-items:center; gap:.8rem; padding:1rem 1.2rem;
  border-radius:999px; font-size:.92rem; color:var(--text);
}
.fact-pill .emoji{font-size:1.2rem; flex-shrink:0;}

/* ---------- Projects ---------- */
.project-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1.3rem;}
.project-card{
  padding:1.9rem; display:flex; flex-direction:column; gap:.9rem;
  transition:transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.project-card:hover{transform:translateY(-4px); border-color:var(--accent); box-shadow:0 22px 45px -25px rgba(59,130,246,.35);}
.project-card h3{font-size:1.1rem; color:var(--text);}
.project-card p{font-size:.92rem; color:var(--text-dim); flex-grow:1;}
.tag-row{display:flex; flex-wrap:wrap; gap:.5rem; margin-top:.3rem;}
.tag{font-size:.72rem; color:var(--accent); background:var(--accent-dim); padding:.3rem .6rem; border-radius:999px; font-weight:600;}
.project-link{
  margin-top:.2rem; font-size:.85rem; font-weight:600; color:var(--accent); text-decoration:none;
  display:inline-flex; align-items:center; gap:.4rem;
}
.project-link svg{width:13px; height:13px;}

/* ---------- Gallery ---------- */
.gallery-grid{display:grid; grid-template-columns:repeat(4,1fr); grid-auto-rows:170px; grid-auto-flow:dense; gap:1.1rem;}
.gallery-item{
  position:relative; margin:0; border-radius:var(--radius-m); overflow:hidden;
  display:flex; align-items:center; justify-content:center;
  transition:border-color .2s ease, transform .2s ease;
}
.gallery-item.wide{grid-column:span 2;}
.gallery-item.tall{grid-row:span 2;}
.gallery-item img{width:100%; height:100%; object-fit:cover; object-position:center;}
.gallery-item:not(.placeholder):hover{transform:translateY(-3px);}
.gallery-item.placeholder{
  border:1px dashed var(--border); background:var(--panel);
  color:var(--text-faint); font-size:.78rem; letter-spacing:.06em; text-transform:uppercase;
}
.gallery-item.placeholder:hover{border-color:var(--accent); color:var(--accent);}

/* ---------- Certificates ---------- */
.cert-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1.3rem;}
.cert-card{
  border-radius:var(--radius-m); overflow:hidden; display:flex; flex-direction:column;
  transition:border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.cert-card:hover{transform:translateY(-4px); border-color:var(--accent); box-shadow:0 18px 40px -22px rgba(45,212,191,.3);}
.cert-thumb{display:block; position:relative; aspect-ratio:16/10.5; overflow:hidden; background:var(--row-bg); border-bottom:1px solid var(--border);}
.cert-thumb img{width:100%; height:100%; object-fit:cover; object-position:top; transition:transform .35s ease;}
.cert-card:hover .cert-thumb img{transform:scale(1.06);}
.cert-thumb-doc{width:100%; height:100%; display:flex; align-items:center; justify-content:center; color:var(--accent);}
.cert-thumb-doc svg{width:34px; height:34px;}
.cert-body{padding:1.3rem 1.4rem 1.1rem; display:flex; flex-direction:column; gap:.9rem; flex-grow:1;}
.cert-card h4{font-size:1rem; line-height:1.3; color:var(--text); font-family:var(--font-d); font-weight:600;}
.cert-issuer{font-size:.84rem; color:var(--accent); font-weight:600; margin-top:.35rem;}
.cert-date{font-size:.78rem; color:var(--text-faint); margin-top:.2rem; font-family:var(--font-mono);}
.cert-link{margin-top:auto; padding-top:.6rem; font-size:.84rem; font-weight:600; color:var(--accent); text-decoration:none; display:inline-flex; align-items:center; gap:.4rem;}
.cert-link svg{width:13px; height:13px;}

/* ---------- Articles ---------- */
.article-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1.3rem;}
.article-card{padding:1.6rem; display:flex; flex-direction:column; gap:.7rem; min-height:170px;}
.article-card .cat{font-size:.72rem; color:var(--accent); font-weight:600;}
.article-card h4{font-size:1rem; color:var(--text); font-family:var(--font-d); font-weight:600;}
.article-card p{font-size:.85rem; color:var(--text-dim); flex-grow:1;}
.article-card a{font-size:.82rem; color:var(--accent); text-decoration:none; font-weight:600;}
.article-empty{grid-column:1/-1; text-align:center; padding:3.2rem 1.5rem; border:1px dashed var(--border); border-radius:var(--radius-m);}
.article-empty h4{font-size:1.05rem; margin-bottom:.6rem; color:var(--text); font-family:var(--font-d);}
.article-empty p{font-size:.92rem; color:var(--text-dim); max-width:46ch; margin:0 auto;}
.article-empty a{color:var(--accent); text-decoration:none; font-weight:600;}
.cert-empty{grid-column:1/-1; text-align:center; padding:3.2rem 1.5rem; border:1px dashed var(--border); border-radius:var(--radius-m);}
.cert-empty h4{font-size:1.05rem; margin-bottom:.6rem; color:var(--text); font-family:var(--font-d);}
.cert-empty p{font-size:.92rem; color:var(--text-dim); max-width:46ch; margin:0 auto;}

/* ---------- Experience timeline ---------- */
.timeline{position:relative; max-width:760px; margin:0 auto; padding-left:2.4rem;}
.timeline::before{content:""; position:absolute; left:6px; top:6px; bottom:6px; width:1.5px; background:linear-gradient(var(--accent), var(--grad-b));}
.timeline-item{position:relative; padding-bottom:2.6rem;}
.timeline-item:last-child{padding-bottom:0;}
.timeline-dot{
  position:absolute; left:-2.4rem; top:.3rem; width:13px; height:13px; border-radius:50%;
  background:var(--accent); box-shadow:0 0 0 4px var(--accent-dim);
}
.timeline-head{display:flex; flex-wrap:wrap; align-items:baseline; gap:.6rem; justify-content:space-between;}
.timeline-item h3{font-size:1.08rem; color:var(--text);}
.timeline-date{font-size:.78rem; color:var(--text-faint); font-family:var(--font-mono); white-space:nowrap;}
.timeline-org{font-size:.88rem; color:var(--accent); font-weight:600; margin-top:.2rem;}
.timeline-item p{font-size:.92rem; color:var(--text-dim); margin-top:.6rem;}
.timeline-item .tag-row{margin-top:.8rem;}

/* ---------- Involvement ---------- */
.involve-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1.3rem;}
.involve-card{padding:1.6rem;}
.involve-role{font-size:1.02rem; font-weight:600; color:var(--text); margin-bottom:.3rem; font-family:var(--font-d);}
.involve-org{font-size:.85rem; color:var(--accent); font-weight:600; margin-bottom:.7rem;}
.involve-card p{font-size:.88rem; color:var(--text-dim);}
.upcoming-row{display:flex; gap:1rem; margin-top:2.6rem; flex-wrap:wrap;}
.upcoming-chip{
  display:flex; align-items:center; gap:.7rem; border-style:dashed !important;
  padding:.9rem 1.2rem; font-size:.86rem; color:var(--text-dim);
}
.upcoming-chip strong{color:var(--text); font-weight:600; font-family:var(--font-d);}

/* ---------- Skills ---------- */
.skills-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:1.5rem;}
.skill-group{padding:1.7rem 1.8rem;}
.skill-group h3{font-size:.95rem; color:var(--text); margin-bottom:1.3rem; display:flex; align-items:center; gap:.5rem;}
.skill-row{margin-bottom:1.1rem;}
.skill-row:last-child{margin-bottom:0;}
.skill-row-head{display:flex; align-items:center; justify-content:space-between; margin-bottom:.45rem; font-size:.86rem;}
.skill-name{display:flex; align-items:center; gap:.5rem; color:var(--text);}
.skill-pct{color:var(--text-faint); font-family:var(--font-mono); font-size:.78rem;}
.skill-track{height:6px; border-radius:999px; background:var(--track-bg); overflow:hidden;}
.skill-fill{height:100%; width:0; border-radius:999px; background:var(--cta-gradient); transition:width 1.1s cubic-bezier(.16,1,.3,1);}

/* ---------- Contact ---------- */
.contact-grid{display:grid; grid-template-columns:1.1fr .9fr; gap:2rem; align-items:stretch;}
.contact-form-card, .contact-side-card{padding:2.2rem;}
.field{display:flex; flex-direction:column; gap:.4rem; margin-bottom:1.1rem;}
.field label{font-size:.82rem; color:var(--text-dim); font-weight:600;}
.field input, .field textarea{
  background:var(--field-bg); border:1px solid var(--border); border-radius:var(--radius-s);
  padding:.8rem 1rem; color:var(--text); font-size:.94rem; resize:vertical;
}
.field input:focus, .field textarea:focus{outline:none; border-color:var(--accent);}
.contact-form-card .btn-primary{width:100%; justify-content:center; margin-top:.4rem;}
.contact-form-card .btn-primary:disabled{opacity:.6; cursor:default; transform:none;}
.form-status{min-height:1.2em; margin-top:.7rem; font-size:.85rem; text-align:center;}
.form-status.ok{color:var(--accent);}
.form-status.err{color:#f87171;}

.contact-side-card{display:flex; flex-direction:column; align-items:center; text-align:center; gap:1.1rem;}
.avatar-circle{
  width:104px; height:104px; border-radius:50%; padding:3px; background:var(--cta-gradient);
}
.avatar-circle img{width:100%; height:100%; border-radius:50%; object-fit:cover; object-position:top;}
.contact-quote{font-size:.94rem; color:var(--text-dim); font-style:italic; max-width:32ch;}
.connect-heading{font-size:.85rem; font-weight:700; color:var(--accent); text-transform:uppercase; letter-spacing:.06em; margin-top:.6rem;}
.connect-list{width:100%; display:flex; flex-direction:column; gap:.6rem; text-align:left;}
.connect-row{
  display:flex; align-items:center; gap:.8rem; padding:.75rem .9rem; border-radius:var(--radius-s);
  background:var(--row-bg); border:1px solid var(--border-soft); text-decoration:none; color:var(--text);
  font-size:.88rem; transition:border-color .2s ease, background .2s ease;
}
.connect-row:hover{border-color:var(--accent); background:rgba(45,212,191,.06);}
.connect-row .ic{
  width:32px; height:32px; border-radius:8px; background:var(--accent-dim); color:var(--accent);
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
}
.connect-row .ic svg{width:15px; height:15px;}

footer{border-top:1px solid var(--border-soft); padding:2.4rem 0; position:relative; z-index:1;}
.footer-inner{text-align:center; display:flex; flex-direction:column; align-items:center; gap:.4rem; font-size:.85rem; color:var(--text-faint);}
.footer-inner .tagline{color:var(--text-dim);}
.footer-social{display:flex; gap:.7rem; margin-bottom:.5rem;}
.footer-social a{
  width:36px; height:36px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  border:1px solid var(--border); color:var(--text-dim);
  transition:color .2s ease, border-color .2s ease, transform .2s ease;
}
.footer-social a:hover{color:var(--accent); border-color:var(--accent); transform:translateY(-2px);}
.footer-social svg{width:16px; height:16px;}

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  nav.links{display:none;}
  .nav-toggle{display:flex; align-items:center; justify-content:center;}
  .about-grid{grid-template-columns:1fr; gap:2.4rem;}
  .project-grid{grid-template-columns:1fr;}
  .gallery-grid{grid-template-columns:repeat(2,1fr);}
  .involve-grid{grid-template-columns:1fr;}
  .skills-grid{grid-template-columns:1fr;}
  .cert-grid{grid-template-columns:1fr;}
  .article-grid{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
}
@media (max-width: 560px){
  section{padding:4.5rem 0;}
  .hero{padding:120px 0 70px;}
  .timeline{padding-left:1.9rem;}
  .timeline-dot{left:-1.9rem;}
}