/* ============================================================
   NGCSA CORE CSS v9 — complete rewrite
   Dark theme DEFAULT · Light theme via [data-theme="light"]
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── TOKENS : DARK (default) ── */
:root {
  --bg0:#06080F; --bg1:#0A0D17; --bg2:#0F1220; --bg3:#151929;
  --surface:rgba(255,255,255,.03); --surface2:rgba(255,255,255,.06);
  --border:rgba(255,255,255,.07); --border2:rgba(0,220,255,.2);
  --teal:#00DCF0; --teal-dark:#00A8C0;
  --teal-glow:rgba(0,220,240,.22); --teal-dim:rgba(0,220,240,.09);
  --violet:#7B5CF5;
  --white:#FFF; --text:#DDE4EF; --text2:#BCC8D8;
  --muted:#7A8499; --muted2:#4A5262;
  --ff-display:'Plus Jakarta Sans','Inter',sans-serif;
  --ff-body:'Inter',sans-serif;
  --ff-mono:'JetBrains Mono',monospace;
  --r:10px; --r-lg:18px; --r-xl:28px;
  --ease:cubic-bezier(.25,.46,.45,.94);
}

/* ── TOKENS : LIGHT ── */
[data-theme="light"] {
  --bg0:#F8FAFB; --bg1:#FFFFFF; --bg2:#F0F4F7; --bg3:#E8EEF3;
  --surface:rgba(0,0,0,.025); --surface2:rgba(0,0,0,.05);
  --border:rgba(0,0,0,.08); --border2:rgba(0,150,180,.25);
  --teal:#0097B2; --teal-dark:#006F88;
  --teal-glow:rgba(0,151,178,.2); --teal-dim:rgba(0,151,178,.08);
  --violet:#5B48D9;
  --white:#FFF; --text:#0F1923; --text2:#2C3A47;
  --muted:#5C6E7E; --muted2:#8FA0AF;
}

/* ── RESET ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--ff-body);background:var(--bg0);color:var(--text);overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none}
::selection{background:var(--teal-dim);color:var(--text)}

/* ── SCROLL PROGRESS ── */
#scroll-progress{position:fixed;top:0;left:0;width:0;height:2px;z-index:99999;background:linear-gradient(90deg,var(--teal),var(--violet));transition:width .1s linear}

/* ── CURSOR GLOW ── */
#cursor-glow{position:fixed;top:0;left:0;width:360px;height:360px;border-radius:50%;background:radial-gradient(circle,rgba(0,220,240,.04) 0%,transparent 70%);pointer-events:none;z-index:0;will-change:transform;transition:transform .08s linear}

/* ── SKIP LINK ── */
.skip-link{position:absolute;top:-999px;left:16px;padding:8px 16px;background:var(--teal);color:#fff;border-radius:0 0 var(--r) var(--r);font-weight:600;font-size:.875rem;z-index:99999;text-decoration:none}
.skip-link:focus{top:0}

/* ══════════════════════════════════════════════
   NAVBAR
══════════════════════════════════════════════ */
#navbar{
  position:fixed;top:0;left:0;right:0;
  z-index:8000;
  padding:18px 0;
  transition:padding .4s var(--ease),background .4s,border-color .4s;
}
#navbar.scrolled{
  padding:10px 0;
  background:rgba(6,8,15,.92);
  backdrop-filter:blur(24px);
  -webkit-backdrop-filter:blur(24px);
  border-bottom:1px solid var(--border);
  box-shadow:0 2px 20px rgba(0,0,0,.4);
}
[data-theme="light"] #navbar.scrolled{background:rgba(248,250,251,.94)}

.nav-wrap{
  max-width:1200px;margin:0 auto;padding:0 32px;
  display:flex;align-items:center;gap:8px;
}

/* Logo */
.nav-logo{display:flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none}
.nav-logo-pip{width:9px;height:9px;border-radius:50%;background:var(--teal);box-shadow:0 0 10px var(--teal);animation:pip 2.4s infinite ease-in-out;flex-shrink:0}
@keyframes pip{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.65)}}
.nav-logo-text{display:flex;flex-direction:column;line-height:1.2}
.nav-logo-abbr{font-family:var(--ff-display);font-size:.95rem;font-weight:800;color:var(--teal);letter-spacing:.04em}
.nav-logo-full{font-size:.58rem;color:var(--muted);font-weight:500;max-width:220px}

/* Desktop nav links wrapper */
.nav-links{
  display:flex;align-items:center;gap:2px;
  margin-left:auto;
}

/* Every nav item (link or button) */
.nav-item{
  font-size:.84rem;font-weight:500;color:var(--muted);
  padding:8px 13px;border-radius:var(--r);
  transition:color .2s,background .2s;
  white-space:nowrap;cursor:pointer;
  display:flex;align-items:center;gap:4px;
  text-decoration:none;background:none;border:none;
  font-family:var(--ff-body);letter-spacing:.01em;
}
.nav-item:hover,.nav-item.active{color:var(--text);background:var(--surface)}
.nav-item.nav-cta{
  color:var(--teal)!important;border:1.5px solid var(--border2);
  background:var(--teal-dim);border-radius:100px;margin-left:6px;
}
.nav-item.nav-cta:hover{background:var(--teal)!important;color:#fff!important;box-shadow:0 4px 18px var(--teal-glow)}

/* Drop arrow */
.drop-arrow{transition:transform .25s var(--ease);flex-shrink:0;pointer-events:none}

/* ── DROPDOWN CONTAINER ── */
.nav-dropdown{
  position:relative;
  display:flex;align-items:center;
}

/* ── DROPDOWN PANEL ──
   Uses visibility+opacity (NOT display:none) so transitions work.
   z-index 9000 keeps it above ALL page content and canvases.       */
.drop-panel{
  position:absolute;
  top:calc(100% + 6px);
  left:50%;
  transform:translateX(-50%) translateY(-6px);
  min-width:252px;
  background:var(--bg1);
  border:1px solid var(--border);
  border-radius:var(--r-xl);
  box-shadow:0 24px 64px rgba(0,0,0,.55),0 0 0 1px var(--border);
  /* hidden state */
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .18s ease,transform .18s ease,visibility 0s linear .18s;
  z-index:9000;
  overflow:hidden;
}
/* Bridge — stops panel closing when mouse crosses the gap */
.drop-panel::before{
  content:'';position:absolute;top:-8px;left:0;right:0;height:8px;
}

/* open state — triggered by JS adding .open OR by :hover */
.nav-dropdown:hover .drop-panel,
.nav-dropdown.open .drop-panel{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
  transform:translateX(-50%) translateY(0);
  transition:opacity .18s ease,transform .18s ease,visibility 0s linear 0s;
}
.nav-dropdown:hover .drop-arrow,
.nav-dropdown.open .drop-arrow{transform:rotate(180deg)}

.drop-inner{padding:7px}

/* Drop item */
.drop-item{
  display:flex;align-items:center;gap:12px;
  padding:10px 12px;border-radius:var(--r-lg);
  transition:background .15s,transform .15s,color .15s;
  text-decoration:none;color:var(--text);
}
.drop-item:hover{background:var(--surface2);transform:translateX(3px)}
.drop-item.active .drop-label{color:var(--teal)}
.drop-item.active .drop-icon{background:var(--teal);color:#fff}

.drop-icon{
  width:36px;height:36px;border-radius:var(--r);
  background:var(--teal-dim);border:1px solid var(--border2);
  display:flex;align-items:center;justify-content:center;
  color:var(--teal);flex-shrink:0;
  transition:background .15s,color .15s;
}
.drop-item:hover .drop-icon{background:var(--teal);color:#fff}
.drop-icon svg{width:17px;height:17px}
.drop-label{font-size:.875rem;font-weight:600;color:var(--text);margin-bottom:2px}
.drop-sub{font-size:.73rem;color:var(--muted);line-height:1.3}

/* ── HAMBURGER ── */
.hamburger{display:none;flex-direction:column;gap:5px;width:26px;padding:4px 0;margin-left:8px;flex-shrink:0}
.hamburger span{display:block;height:1.5px;background:var(--text);border-radius:2px;transition:all .3s var(--ease);transform-origin:left}
.hamburger.open span:nth-child(1){transform:rotate(45deg) translate(1px,-1px)}
.hamburger.open span:nth-child(2){opacity:0;transform:scaleX(0)}
.hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(1px,1px)}

/* ── THEME TOGGLE ── */
.theme-toggle{
  width:36px;height:36px;border-radius:50%;
  border:1px solid var(--border);background:var(--surface);
  display:flex;align-items:center;justify-content:center;
  color:var(--muted);cursor:pointer;transition:all .25s;flex-shrink:0;margin-left:4px;
}
.theme-toggle:hover{border-color:var(--border2);color:var(--teal);background:var(--teal-dim)}
.theme-toggle svg{width:16px;height:16px}

/* Hide desktop nav on small screens */
@media(max-width:1060px){.nav-links{display:none}.hamburger{display:flex}}
@media(min-width:1061px){.hamburger{display:none}#mobile-menu{display:none!important}}

/* ══════════════════════════════════════════════
   MOBILE MENU — slides in from left
══════════════════════════════════════════════ */
#mobile-menu{
  position:fixed;top:0;left:0;
  width:min(360px,100vw);height:100vh;
  background:var(--bg1);
  border-right:1px solid var(--border);
  z-index:9500;
  display:flex;flex-direction:column;
  overflow-y:auto;overscroll-behavior:contain;
  opacity:0;pointer-events:none;
  transform:translateX(-100%);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
  box-shadow:8px 0 40px rgba(0,0,0,.5);
}
#mobile-menu.open{opacity:1;pointer-events:auto;transform:translateX(0)}
/* Backdrop */
#mobile-menu::after{
  content:'';position:fixed;
  top:0;left:min(360px,100vw);right:0;bottom:0;
  background:rgba(0,0,0,.5);
  opacity:0;pointer-events:none;
  transition:opacity .3s;
  z-index:-1;
}
#mobile-menu.open::after{opacity:1;pointer-events:auto}
.mob-close{
  position:absolute;top:16px;right:16px;
  width:38px;height:38px;border-radius:50%;
  border:1px solid var(--border);background:var(--surface);
  display:flex;align-items:center;justify-content:center;
  color:var(--muted);cursor:pointer;transition:all .2s;z-index:2;
}
.mob-close:hover{border-color:var(--border2);color:var(--teal);background:var(--teal-dim)}
.mob-logo{
  padding:24px 20px 16px;
  display:flex;flex-direction:column;gap:4px;
  border-bottom:1px solid var(--border);
}
.mob-nav{padding:10px 12px 40px;display:flex;flex-direction:column;gap:2px}
.mob-standalone{
  padding:12px 14px;border-radius:var(--r-lg);
  font-family:var(--ff-display);font-size:.95rem;font-weight:700;
  color:var(--muted);text-decoration:none;display:block;transition:all .2s;
}
.mob-standalone:hover,.mob-standalone.active{color:var(--text);background:var(--surface)}
.mob-standalone.mob-cta{
  color:var(--teal);background:var(--teal-dim);
  border:1px solid var(--border2);text-align:center;margin-top:8px;
}
.mob-group{border-radius:var(--r-lg);overflow:hidden}
.mob-group-btn{
  width:100%;padding:12px 14px;
  display:flex;align-items:center;justify-content:space-between;
  font-family:var(--ff-display);font-size:.95rem;font-weight:700;
  color:var(--muted);background:none;border:none;cursor:pointer;
  border-radius:var(--r-lg);transition:all .2s;text-align:left;
}
.mob-group-btn:hover{color:var(--text);background:var(--surface)}
.mob-group-btn[aria-expanded="true"]{color:var(--teal);background:var(--teal-dim)}
.mob-arrow{transition:transform .3s var(--ease);flex-shrink:0}
.mob-group-btn[aria-expanded="true"] .mob-arrow{transform:rotate(180deg)}
.mob-group-items{
  max-height:0;overflow:hidden;
  transition:max-height .35s var(--ease),opacity .3s;
  opacity:0;padding:0 6px;
}
.mob-group-items.open{max-height:400px;opacity:1}
.mob-link{
  display:block;padding:9px 16px;border-radius:var(--r);
  font-size:.875rem;font-weight:500;color:var(--muted);
  text-decoration:none;transition:all .2s;
  border-left:2px solid transparent;
}
.mob-link:hover,.mob-link.active{
  color:var(--teal);background:var(--teal-dim);
  border-left-color:var(--teal);padding-left:20px;
}

/* ══════════════════════════════════════════════
   LAYOUT HELPERS
══════════════════════════════════════════════ */
.container{max-width:1180px;margin:0 auto;padding:0 36px}
section{position:relative}
@media(max-width:640px){.container{padding:0 18px}}

/* ── EYEBROW / SECTION HEADER ── */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--ff-mono);font-size:.67rem;font-weight:500;
  color:var(--teal);letter-spacing:.14em;text-transform:uppercase;margin-bottom:14px;
}
.eyebrow::before{content:'';width:20px;height:1.5px;background:var(--teal)}
.section-title{
  font-family:var(--ff-display);font-size:clamp(1.8rem,3.6vw,2.75rem);
  font-weight:800;color:var(--text);line-height:1.1;letter-spacing:-.025em;margin-bottom:14px;
}
.section-desc{font-size:1.0125rem;color:var(--muted);line-height:1.75;max-width:520px}

/* ── REVEAL ── */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .75s var(--ease),transform .75s var(--ease)}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}
.reveal.d3{transition-delay:.24s}.reveal.d4{transition-delay:.32s}

/* ── BUTTONS ── */
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 26px;background:var(--teal);color:#0A0D17;
  border-radius:100px;font-weight:700;font-size:.875rem;
  transition:all .3s var(--ease);position:relative;overflow:hidden;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 28px var(--teal-glow)}
.btn-ghost{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 26px;border:1.5px solid var(--border);
  border-radius:100px;font-weight:500;font-size:.875rem;
  color:var(--text);background:var(--surface);transition:all .3s var(--ease);
}
.btn-ghost:hover{border-color:var(--border2);color:var(--teal);transform:translateY(-2px)}

/* ── CARDS ── */
.glass-card{
  border:1px solid var(--border);border-radius:var(--r-xl);
  background:var(--surface);backdrop-filter:blur(6px);
  transition:border-color .3s,transform .35s var(--ease),box-shadow .35s;
}
.glass-card:hover{border-color:rgba(0,220,240,.2);transform:translateY(-4px);box-shadow:0 20px 50px rgba(0,0,0,.45)}

/* ── ICON BOX ── */
.icon-box{
  width:46px;height:46px;border-radius:var(--r);
  background:var(--teal-dim);border:1px solid var(--border2);
  display:flex;align-items:center;justify-content:center;color:var(--teal);flex-shrink:0;
}
.icon-box svg{width:20px;height:20px}

/* ── TAG ── */
.tag{
  padding:4px 12px;border-radius:100px;
  border:1px solid var(--border);background:var(--surface);
  font-size:.75rem;color:var(--muted);transition:all .3s;
}
.tag:hover{border-color:var(--border2);color:var(--teal);background:var(--teal-dim)}

/* ── TIMELINE ── */
.timeline{padding-left:22px;position:relative}
.timeline::before{content:'';position:absolute;left:0;top:6px;bottom:6px;width:1.5px;background:linear-gradient(to bottom,var(--teal),transparent)}
.tl-item{position:relative;margin-bottom:32px}
.tl-item::before{content:'';position:absolute;left:-26px;top:5px;width:9px;height:9px;border-radius:50%;background:var(--bg1);border:2px solid var(--teal);box-shadow:0 0 7px var(--teal-glow)}
.tl-date{font-family:var(--ff-mono);font-size:.67rem;color:var(--teal);letter-spacing:.08em;margin-bottom:3px}
.tl-role{font-family:var(--ff-display);font-weight:700;font-size:.9375rem;color:var(--text);margin-bottom:2px}
.tl-org{font-size:.84rem;color:var(--muted)}
.tl-badge{display:inline-block;margin-left:8px;padding:2px 8px;background:var(--teal-dim);border:1px solid var(--border2);border-radius:100px;font-size:.6rem;color:var(--teal);font-weight:700;text-transform:uppercase}

/* ── PAGE HERO ── */
.page-hero{position:relative;overflow:hidden;padding:150px 0 90px;background:linear-gradient(150deg,var(--bg0) 0%,var(--bg2) 100%);border-bottom:1px solid var(--border)}
[data-theme="light"] .page-hero{background:linear-gradient(150deg,var(--bg0) 0%,#E8F5F8 100%)}
.page-hero-bg{position:absolute;inset:0;z-index:1;pointer-events:none;background:radial-gradient(ellipse 70% 60% at 70% 50%,rgba(0,220,240,.05) 0%,transparent 70%)}
.page-hero-inner{position:relative;z-index:2}
.hero-bg-canvas{position:absolute!important;inset:0!important;width:100%!important;height:100%!important;z-index:0!important;pointer-events:none;display:block}
.page-hero .section-title{text-shadow:0 1px 20px rgba(6,8,15,.6)}

/* ── PUB BADGES ── */
.pub-badge{padding:3px 9px;border-radius:100px;font-size:.67rem;font-weight:700;text-transform:uppercase;letter-spacing:.07em}
.pb-ieee{background:rgba(0,114,198,.12);border:1px solid rgba(0,114,198,.28);color:#4EA8E0}
.pb-elsevier{background:rgba(220,90,0,.1);border:1px solid rgba(220,90,0,.22);color:#FF8C40}
.pb-springer{background:rgba(0,140,0,.1);border:1px solid rgba(0,140,0,.22);color:#4CC44C}
.pb-wiley{background:rgba(91,72,217,.1);border:1px solid rgba(91,72,217,.22);color:#9B80FF}
.pb-mdpi{background:rgba(0,220,240,.1);border:1px solid rgba(0,220,240,.22);color:var(--teal)}
.pb-conf{background:rgba(156,163,175,.1);border:1px solid rgba(156,163,175,.22);color:#9CA3AF}
.pb-book{background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.22);color:#FFB800}

/* ── FOOTER ── */
#footer{padding:68px 0 32px;background:var(--bg0);border-top:1px solid var(--border);position:relative}
#footer::before{content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);width:32%;height:2px;background:linear-gradient(90deg,transparent,var(--teal),transparent)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:52px;margin-bottom:48px}
.footer-brand-name{font-family:var(--ff-display);font-size:1rem;font-weight:800;color:var(--text);margin-bottom:4px}
.footer-brand-abbr{font-size:.7rem;color:var(--teal);font-family:var(--ff-mono);letter-spacing:.08em;margin-bottom:10px}
.footer-brand-desc{font-size:.84rem;color:var(--muted);line-height:1.7;max-width:260px;margin-bottom:20px}
.footer-socials{display:flex;gap:10px}
.footer-social{width:34px;height:34px;border:1px solid var(--border);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--muted);transition:all .3s}
.footer-social:hover{border-color:var(--border2);color:var(--teal);background:var(--teal-dim)}
.footer-social svg{width:14px;height:14px}
.footer-col-title{font-family:var(--ff-display);font-size:.84rem;font-weight:700;color:var(--text);margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:.84rem;color:var(--muted);transition:color .3s}
.footer-links a:hover{color:var(--text)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;padding-top:24px;border-top:1px solid var(--border);font-size:.76rem;color:var(--muted2)}

/* ── CARD TRANSPARENCY (canvas bg pages) ── */
.glass-card,.course-card,.tc,.rf-card,.hi-card,
.achievement-item,.cert-row,.ach-item,.sup-card,
.activity-item,.position-card,.article-card,
.ds-card,.sw-card,.grant-card,.testimonial,
.funder-card,.talk-item,.expect-card,.profile-card,
.pub-card,.review-table-wrap,.conf-card,.filter-bar,.chart-box{
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}

/* ── PAGE TRANSITION ── */
.page-transition{animation:pageReveal .45s var(--ease) both}
@keyframes pageReveal{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

/* ── PRINT ── */
@media print{
  #navbar,#mobile-menu,.skip-link,#cursor-glow,#scroll-progress,.theme-toggle,.hamburger,#footer{display:none!important}
  body{background:#fff!important;color:#000!important}
  .container{max-width:100%;padding:0}
}

/* ── ACCESSIBILITY ── */
:focus-visible{outline:2px solid var(--teal);outline-offset:3px}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
}

/* ── RESPONSIVE ── */
@media(max-width:900px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media(max-width:640px){
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:10px;text-align:center}
}