/* ===== RESET ===== */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}

:root{
  --bg-primary:#0a0a0a;
  --bg-secondary:#111111;
  --bg-card:#1a1a1a;
  --accent:#00d4aa;
  --accent-dim:#0f4c5c;
  --accent-glow:rgba(0,212,170,.15);
  --text-primary:#f0f0f0;
  --text-secondary:#888888;
  --border:#2a2a2a;
  --r:8px;
  --ff:'IBM Plex Sans',system-ui,sans-serif;
  --mono:'IBM Plex Mono',monospace;
  --nav-h:56px;
}

html,body{
  height:100%;
  overflow:hidden;
  font-family:var(--ff);
  color:var(--text-primary);
  background:var(--bg-primary);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{color:#33e0bb}
img{max-width:100%;display:block}
button{cursor:pointer;font-family:var(--ff)}

/* ===== DECK — no scroll, show/hide ===== */
.deck{
  height:100vh;height:100dvh;
  position:relative;
  overflow:hidden;
}

/* ===== SLIDE — stacked, only .active visible ===== */
.slide{
  position:absolute;
  inset:0;
  display:none;
  flex-direction:column;
  overflow:hidden;
}
.slide.active{display:flex}
.slide-even{background:var(--bg-secondary)}

/* Single-content slides */
.slide-body{
  flex:1;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:calc(var(--nav-h) + 1.5rem) 4rem 2rem;
}
.slide-body .wrap{max-width:1100px;width:100%}

/* Section header for sub-slide sections */
.slide-header{
  padding:calc(var(--nav-h) + .8rem) 2rem .4rem;
  text-align:center;
  flex-shrink:0;
}
.slide-header h2{
  font-size:1.3rem;font-weight:700;text-transform:uppercase;
  letter-spacing:.1em;color:var(--accent);margin-bottom:.15rem;
}
.slide-header p{font-size:.82rem;color:var(--text-secondary)}

/* Section title (single slides) */
.sec-title{
  font-size:2.5rem;font-weight:700;text-transform:uppercase;
  letter-spacing:-.02em;margin-bottom:.2rem;
}
.sec-accent{width:50px;height:3px;background:var(--accent);margin-bottom:1.5rem;border-radius:2px}
.sec-subtitle{font-size:.88rem;color:var(--text-secondary);margin-bottom:1.5rem}

/* ===== SUB-SLIDES — stacked, only .active visible ===== */
.slide-track{
  flex:1;
  position:relative;
  overflow:hidden;
}

.sub-slide{
  position:absolute;
  inset:0;
  display:none;
  align-items:center;
  justify-content:center;
  padding:1rem 4rem 3rem;
}
.sub-slide.active{display:flex}

/* ===== TOP NAV ===== */
.top-nav{
  position:fixed;top:0;left:0;right:0;
  height:var(--nav-h);
  background:rgba(10,10,10,.88);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  z-index:200;
  display:flex;align-items:center;
  padding:0 2rem;
  border-bottom:1px solid var(--border);
}
.top-nav .brand{
  font-weight:700;font-size:.9rem;color:var(--text-primary);
  letter-spacing:.04em;text-transform:uppercase;margin-right:auto;
  cursor:pointer;background:none;border:none;
}
.top-nav .nav-links{display:flex;gap:1.5rem;list-style:none}
.top-nav .nav-links a{
  font-size:.73rem;font-weight:500;color:var(--text-secondary);
  letter-spacing:.03em;text-transform:uppercase;position:relative;
}
.top-nav .nav-links a:hover,
.top-nav .nav-links a.active{color:var(--accent)}
.top-nav .nav-links a.active::after{
  content:'';position:absolute;bottom:-4px;left:0;right:0;
  height:2px;background:var(--accent);border-radius:1px;
}
.menu-btn{display:none;background:none;border:none;color:var(--text-primary);font-size:1.4rem}

/* ===== SIDE NAV (DOTS) ===== */
.side-nav{
  position:fixed;right:1.5rem;top:50%;transform:translateY(-50%);
  z-index:200;display:flex;flex-direction:column;align-items:center;gap:12px;
}
.side-nav .dot{
  width:8px;height:8px;border-radius:50%;
  background:rgba(255,255,255,.15);border:none;
  cursor:pointer;position:relative;
}
.side-nav .dot:hover{background:rgba(255,255,255,.4)}
.side-nav .dot.active{
  background:var(--accent);
  box-shadow:0 0 10px rgba(0,212,170,.5);
  transform:scale(1.4);
}
.side-nav .dot-label{
  position:absolute;right:20px;top:50%;transform:translateY(-50%);
  font-size:.68rem;color:var(--text-secondary);white-space:nowrap;
  opacity:0;pointer-events:none;transition:opacity .2s;font-family:var(--mono);
}
.side-nav .dot:hover .dot-label{opacity:1}

/* ===== SUB-DOTS ===== */
.sub-dots{
  position:absolute;bottom:1.2rem;left:50%;transform:translateX(-50%);
  display:flex;gap:8px;z-index:10;
}
.sub-dots .sub-dot{
  width:8px;height:8px;border-radius:50%;
  background:rgba(255,255,255,.2);border:none;cursor:pointer;
}
.sub-dots .sub-dot.active{background:var(--accent);transform:scale(1.3)}

/* Slide arrows */
.slide-arrow{
  position:absolute;top:50%;transform:translateY(-50%);z-index:10;
  width:40px;height:40px;border-radius:50%;
  background:rgba(255,255,255,.06);border:1px solid var(--border);
  color:var(--text-secondary);font-size:1.1rem;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
}
.slide-arrow:hover{
  background:var(--accent-glow);color:var(--accent);border-color:var(--accent);
}
.slide-arrow.left{left:1.5rem}
.slide-arrow.right{right:4rem}

/* ===== HERO ===== */
#hero{
  background:radial-gradient(ellipse at 50% 50%,rgba(0,212,170,.05) 0%,transparent 70%),var(--bg-primary);
}
.hero-content{text-align:center;max-width:700px}
.hero-photo{
  width:120px;height:120px;border-radius:50%;object-fit:cover;
  border:3px solid var(--accent-dim);margin:0 auto 1.5rem;
  box-shadow:0 0 40px rgba(0,212,170,.12);
}
.hero-name{font-size:3.5rem;font-weight:700;letter-spacing:-.03em;line-height:1.1;margin-bottom:.4rem}
.hero-sub{font-size:1.1rem;color:var(--text-secondary);font-weight:400;margin-bottom:2rem}
.hero-links{display:flex;justify-content:center;gap:.7rem;flex-wrap:wrap}
.hero-links a{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.45rem 1.1rem;border-radius:var(--r);
  font-size:.8rem;font-weight:500;letter-spacing:.02em;
  border:1px solid var(--border);color:var(--text-secondary);
}
.hero-links a:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}
.hero-links-primary{margin-bottom:.5rem}
.hero-links-primary a:first-child{
  background:var(--accent);color:var(--bg-primary);border-color:var(--accent);font-weight:600;
}
.hero-links-primary a:first-child:hover{background:#33e0bb;border-color:#33e0bb}
.hero-links-primary a:last-child{
  background:transparent;color:var(--accent);border:1.5px solid var(--accent);font-weight:600;
}
.hero-links-primary a:last-child:hover{background:var(--accent);color:var(--bg-primary)}
.hero-contact{
  margin-top:1.8rem;display:flex;justify-content:center;
  gap:2.5rem;flex-wrap:wrap;
}
.hero-contact .hc{text-align:center}
.hero-contact .hc strong{
  display:block;font-size:.62rem;text-transform:uppercase;
  letter-spacing:.06em;color:var(--accent);margin-bottom:.1rem;font-family:var(--mono);
}
.hero-contact .hc a{font-size:.8rem;color:var(--text-secondary)}

/* Footer */
.footer-line{
  position:absolute;bottom:0;left:0;right:0;text-align:center;
  padding:1rem;font-size:.73rem;color:var(--text-secondary);
}
.footer-line a{color:var(--accent)}

/* ===== ABOUT ===== */
.about-wrap{max-width:720px;width:100%;text-align:center}
.about-quote{
  font-size:1.15rem;font-style:italic;color:var(--text-primary);
  border-left:3px solid var(--accent);padding-left:1.2rem;
  margin:0 auto 1.8rem;line-height:1.6;
  text-align:left;display:inline-block;
}
.about-body p{
  font-size:.86rem;color:var(--text-secondary);
  line-height:1.8;margin-bottom:.8rem;text-align:left;
}
.about-body p:last-child{margin-bottom:0}
.about-body em{color:var(--text-primary)}
.about-stats-grid{
  display:grid;grid-template-columns:1fr 1px 1fr;
  grid-template-rows:auto 1px auto;
  margin-top:2rem;padding:1.2rem 1.5rem;
  border:1px solid var(--border);border-radius:8px;
  background:var(--bg-card);
  max-width:320px;margin-left:auto;margin-right:auto;
  gap:.8rem 0;
}
.grid-vline{background:var(--border)}
.grid-hline{background:var(--border)}
.stat-inline{text-align:center;padding:.4rem .8rem}
.stat-inline .num{
  display:block;font-size:1.6rem;font-weight:700;
  color:var(--accent);line-height:1.2;
}
.stat-inline .lbl{
  font-size:.65rem;color:var(--text-secondary);text-transform:uppercase;
  letter-spacing:.06em;font-family:var(--mono);
}

/* ===== EXPERIENCE CARDS ===== */
.exp-card{
  max-width:640px;width:100%;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:12px;padding:2.5rem;
}
.exp-card .role{font-size:1.25rem;font-weight:700;margin-bottom:.15rem}
.exp-card .org{font-size:.88rem;color:var(--accent);font-style:italic;margin-bottom:.15rem}
.exp-card .date{
  font-size:.76rem;color:var(--text-secondary);font-family:var(--mono);
  font-weight:500;margin-bottom:1.1rem;
}
.exp-card ul{list-style:none}
.exp-card li{
  font-size:.85rem;color:var(--text-secondary);
  padding:.22rem 0 .22rem 1.2rem;position:relative;line-height:1.65;
}
.exp-card li::before{content:'\2022';position:absolute;left:0;color:var(--accent)}

/* ===== RESEARCH CARDS ===== */
.r-card{
  max-width:680px;width:100%;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:12px;overflow:hidden;display:flex;flex-direction:column;
}
.r-card-img{display:none}
.r-card-body{padding:1.6rem;flex:1}
.r-tag{
  display:inline-block;background:var(--accent-glow);color:var(--accent);
  font-size:.66rem;font-weight:600;padding:.18rem .65rem;border-radius:4px;
  letter-spacing:.06em;font-family:var(--mono);margin-bottom:.6rem;
}
.r-card-body h3{font-size:1.1rem;font-weight:700;margin-bottom:.5rem}
.r-card-body p{font-size:.84rem;color:var(--text-secondary);line-height:1.7}
.r-card-foot{padding:0 1.6rem 1.3rem;display:flex;gap:.6rem}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.42rem .95rem;border-radius:var(--r);
  font-size:.76rem;font-weight:600;letter-spacing:.02em;
  border:none;cursor:pointer;
}
.btn-primary{background:var(--accent);color:var(--bg-primary)}
.btn-primary:hover{background:#33e0bb;color:var(--bg-primary)}
.btn-outline{background:transparent;color:var(--accent);border:1.5px solid var(--accent-dim)}
.btn-outline:hover{background:var(--accent-glow);border-color:var(--accent)}

/* ===== ENGINEERING CARDS ===== */
.eng-card{
  max-width:640px;width:100%;
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:12px;overflow:hidden;display:flex;flex-direction:column;
}
.eng-card-img{display:none}
.eng-card-body{padding:1.4rem;flex:1}
.eng-card-body h3{font-size:1.05rem;font-weight:700;color:var(--accent);margin-bottom:.5rem}
.eng-card-body ul{list-style:none}
.eng-card-body li{
  font-size:.82rem;color:var(--text-secondary);
  padding:.18rem 0 .18rem .9rem;position:relative;
}
.eng-card-body li::before{content:'\2014';position:absolute;left:0;color:var(--accent-dim);font-size:.75rem}
.eng-card-foot{padding:0 1.4rem 1rem;display:flex;gap:.5rem;flex-wrap:wrap}

/* ===== GALLERIES ===== */
.gallery-sub{width:100%;max-width:900px}
.gallery-sub h3{font-size:1.05rem;font-weight:700;color:var(--accent);margin-bottom:.25rem}
.gallery-sub .gallery-desc{font-size:.82rem;color:var(--text-secondary);margin-bottom:.8rem}
.gallery-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:.7rem}
.gallery-grid-sm{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}
.gallery-item{
  aspect-ratio:4/3;overflow:hidden;border-radius:var(--r);
  cursor:pointer;position:relative;border:1px solid var(--border);background:var(--bg-secondary);
}
.gallery-item img{width:100%;height:100%;object-fit:cover}
.gallery-item:hover img{transform:scale(1.05)}
.g-label{
  position:absolute;bottom:0;left:0;right:0;
  background:rgba(0,0,0,.75);color:#fff;font-size:.68rem;
  padding:.3rem .5rem;opacity:0;transition:opacity .2s;
}
.gallery-item:hover .g-label{opacity:1}
.gallery-scroll{
  max-height:calc(100vh - 220px);max-height:calc(100dvh - 220px);
  overflow-y:auto;overscroll-behavior:contain;
  scrollbar-width:thin;scrollbar-color:var(--border) transparent;
}

/* ===== SOFTWARE GRID ===== */
.sw-sub-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem;max-width:800px;width:100%}
.sw-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--r);padding:1.3rem;
}
.sw-card:hover{border-color:var(--accent-dim)}
.sw-card h4{font-size:.92rem;font-weight:600;margin-bottom:.15rem}
.sw-tech{font-size:.68rem;font-family:var(--mono);color:var(--accent);margin-bottom:.5rem;font-weight:500}
.sw-card p{font-size:.8rem;color:var(--text-secondary);line-height:1.6}

/* ===== DOCUMENTS ===== */
.doc-list{
  max-height:calc(100vh - 200px);max-height:calc(100dvh - 200px);
  overflow-y:auto;overscroll-behavior:contain;
  scrollbar-width:thin;scrollbar-color:var(--border) transparent;
}
.doc-row{
  display:flex;align-items:center;justify-content:space-between;
  background:var(--bg-card);border:1px solid var(--border);border-radius:var(--r);
  padding:.75rem 1.1rem;gap:1rem;margin-bottom:.45rem;
}
.doc-row:hover{border-color:var(--accent-dim)}
.doc-info{flex:1;min-width:0}
.doc-info h4{font-size:.83rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.doc-info span{font-size:.68rem;color:var(--text-secondary);font-family:var(--mono)}
.doc-row .btn{flex-shrink:0}

/* ===== EDUCATION ===== */
.edu-grid{display:grid;gap:1rem}
.edu-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-left:3px solid var(--accent);border-radius:var(--r);
  padding:1.1rem 1.4rem;
}
.edu-card:hover{border-color:var(--accent-dim);border-left-color:var(--accent)}
.edu-item h3{font-size:1.05rem;font-weight:700}
.edu-meta{font-size:.8rem;color:var(--accent);font-family:var(--mono);font-weight:500;margin-bottom:.3rem}
.edu-item p{font-size:.84rem;color:var(--text-secondary);line-height:1.65}
.edu-rows{display:flex;flex-direction:column;gap:.4rem;margin-top:.3rem}
.edu-row-label{
  font-size:.68rem;font-weight:600;text-transform:uppercase;
  letter-spacing:.06em;color:var(--text-secondary);font-family:var(--mono);
  margin-top:.4rem;
}
.edu-row-label:first-child{margin-top:0}
.tags{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.3rem}
.tag{
  background:var(--accent-glow);color:var(--accent);
  font-size:.68rem;font-weight:500;padding:.18rem .55rem;
  border-radius:4px;font-family:var(--mono);
}

/* ===== SKILLS ===== */
.skills-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.skill-group{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:var(--r);padding:1.2rem 1.4rem;
}
.skill-group:hover{border-color:var(--accent-dim)}
.skill-group h3{
  font-size:.73rem;font-weight:700;color:var(--accent);text-transform:uppercase;
  letter-spacing:.07em;margin-bottom:.6rem;font-family:var(--mono);
  padding-bottom:.5rem;border-bottom:1px solid var(--border);
}
.skill-group ul{list-style:none}
.skill-group li{font-size:.82rem;color:var(--text-secondary);padding:.15rem 0}

/* ===== PAPERS ARROW ===== */
.papers-arrow{
  position:absolute;
  right:25%;
  display:flex;
  align-items:center;
  z-index:5;
  transform:translateY(-50%);
}
.pa-dot{
  width:7px;height:7px;border-radius:50%;flex-shrink:0;
  background:var(--accent);
  box-shadow:0 0 8px rgba(0,212,170,.4);
}
.pa-line{
  flex:1;height:0;
  border-top:1.5px solid var(--accent-dim);
  min-width:20px;
}
.pa-head{
  width:0;height:0;flex-shrink:0;
  border-top:5px solid transparent;
  border-bottom:5px solid transparent;
  border-left:9px solid var(--accent-dim);
}
.pa-btn{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.45rem 1.1rem;border-radius:var(--r);
  font-size:.8rem;font-weight:500;letter-spacing:.02em;
  border:1px solid var(--border);color:var(--text-secondary);
  text-decoration:none;white-space:nowrap;flex-shrink:0;
  margin-left:.3rem;
}
.pa-btn:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-glow)}
.hero-links-tertiary{display:none}

/* ===== CONSULT OVERLAY ===== */
.consult-overlay{
  display:none;position:fixed;inset:0;z-index:500;
  background:rgba(0,0,0,.92);
  backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  justify-content:center;align-items:center;padding:2rem;
}
.consult-overlay.active{display:flex}
.consult-close{
  position:absolute;top:1.2rem;right:1.5rem;background:none;border:none;
  color:#fff;font-size:2.2rem;cursor:pointer;z-index:501;opacity:.7;
}
.consult-close:hover{opacity:1}
.consult-panel{
  max-width:580px;width:100%;text-align:center;
}
.consult-header{margin-bottom:2.5rem}
.consult-label{
  font-size:.72rem;font-weight:600;text-transform:uppercase;
  letter-spacing:.12em;color:var(--accent);font-family:var(--mono);
  margin-bottom:.4rem;
}
.consult-title{
  font-size:2.2rem;font-weight:700;letter-spacing:-.02em;
  color:var(--text-primary);margin-bottom:.8rem;line-height:1.15;
}
.consult-desc{
  font-size:.88rem;color:var(--text-secondary);line-height:1.7;
  max-width:480px;margin:0 auto;
}
.consult-cards{
  display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;
}
.consult-card{
  background:var(--bg-card);border:1px solid var(--border);
  border-radius:12px;padding:2rem 1.5rem;
  text-decoration:none;display:flex;flex-direction:column;
  align-items:center;gap:.6rem;
}
.consult-card:hover{
  border-color:var(--accent);background:rgba(0,212,170,.04);
}
.consult-icon{
  font-size:2.4rem;line-height:1;margin-bottom:.2rem;
}
.consult-card h3{
  font-size:1.15rem;font-weight:700;color:var(--text-primary);
}
.consult-card p{
  font-size:.8rem;color:var(--text-secondary);line-height:1.6;
}
.consult-action{
  margin-top:auto;padding-top:.6rem;
  font-size:.78rem;font-weight:600;color:var(--accent);
  letter-spacing:.02em;font-family:var(--mono);
}
.consult-card:hover .consult-action{color:#33e0bb}

/* ===== LIGHTBOX ===== */
.lightbox{
  display:none;position:fixed;inset:0;z-index:500;
  background:rgba(0,0,0,.95);justify-content:center;align-items:center;padding:2rem;
}
.lightbox.active{display:flex}
.lightbox img{max-width:92vw;max-height:88vh;object-fit:contain;border-radius:var(--r)}
.lightbox-close{
  position:absolute;top:1.2rem;right:1.5rem;background:none;border:none;
  color:#fff;font-size:2.2rem;cursor:pointer;z-index:501;opacity:.7;
}
.lightbox-close:hover{opacity:1}
.lightbox-caption{
  position:absolute;bottom:1.5rem;left:50%;transform:translateX(-50%);
  color:rgba(255,255,255,.8);font-size:.85rem;text-align:center;font-family:var(--mono);
}

/* ===== RESPONSIVE ===== */
@media(max-width:900px){
  .skills-grid{grid-template-columns:repeat(2,1fr)}
  .sw-sub-grid{grid-template-columns:1fr}
  .slide-body{padding:calc(var(--nav-h) + 1rem) 2rem 1.5rem}
  .sub-slide{padding:.8rem 2rem 3rem}
}
@media(max-width:768px){
  .top-nav .nav-links{display:none !important}
  .menu-btn{display:block}
  .top-nav.open .nav-links{
    display:flex !important;flex-direction:column;
    position:fixed;top:var(--nav-h);left:0;right:0;
    background:rgba(10,10,10,.95);padding:1rem 2rem;gap:.7rem;
    backdrop-filter:blur(16px);border-bottom:1px solid var(--border);
  }
  .hero-name{font-size:2.4rem}
  .sec-title{font-size:1.8rem}
  .slide-body{padding:calc(var(--nav-h) + .5rem) 1.2rem 1rem}
  .sub-slide{padding:.5rem 1.2rem 3rem}
  .side-nav{right:.7rem;gap:8px}
  .side-nav .dot{width:6px;height:6px}
  .side-nav .dot-label{display:none}
  .slide-arrow{display:none}
  .papers-arrow{display:none}
  .hero-links-tertiary{display:flex}
  .gallery-grid{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}
  .hero-contact{gap:1.2rem}
  .exp-card{padding:1.5rem}
  .exp-card .role{font-size:1.05rem}
}
@media(max-width:480px){
  .skills-grid{grid-template-columns:1fr}
  .hero-links{flex-direction:column;align-items:center}
  .hero-name{font-size:2rem}
  .hero-contact{flex-direction:column;gap:.8rem}
  .consult-cards{grid-template-columns:1fr}
  .consult-title{font-size:1.6rem}
  .consult-panel{padding:0 .5rem}
}