/* =========================================================
   NGCSA PREMIUM DESIGN SYSTEM — LIGHT EDITION
   Lab: Next Generation Computing Systems & Applications Lab
   Palette: Crisp White + Deep Slate + Electric Teal
   ========================================================= */

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

:root {
  /* Light backgrounds */
  --bg0:    #F8FAFB;
  --bg1:    #FFFFFF;
  --bg2:    #F0F4F7;
  --bg3:    #E8EEF3;
  /* Surfaces */
  --surface:  rgba(0,0,0,0.025);
  --surface2: rgba(0,0,0,0.05);
  /* Borders */
  --border:   rgba(0,0,0,0.08);
  --border2:  rgba(0,150,180,0.25);
  /* Brand accent */
  --teal:      #0097B2;
  --teal-dark: #006F88;
  --teal-glow: rgba(0,151,178,0.2);
  --teal-dim:  rgba(0,151,178,0.08);
  --violet:    #5B48D9;
  /* Text */
  --white:  #FFFFFF;
  --text:   #0F1923;
  --text2:  #2C3A47;
  --muted:  #5C6E7E;
  --muted2: #8FA0AF;
  /* Type */
  --ff-display: 'Plus Jakarta Sans','Inter',sans-serif;
  --ff-body:    'Inter',sans-serif;
  --ff-mono:    'JetBrains Mono',monospace;
  /* Shape */
  --r:    10px;
  --r-lg: 18px;
  --r-xl: 28px;
  /* Motion */
  --ease:        cubic-bezier(.25,.46,.45,.94);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
}

/* ---- 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}

/* ---- SCROLL PROGRESS ---- */
#scroll-progress{
  position:fixed;top:0;left:0;width:0;height:3px;z-index:9999;
  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(0,151,178,0.06) 0%,transparent 70%);
  pointer-events:none;z-index:0;will-change:transform;
  transition:transform .08s linear;
}

/* ---- NAVBAR ---- */
#navbar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:20px 0;
  transition:all .4s var(--ease);
}
#navbar.scrolled{
  padding:12px 0;
  background:rgba(248,250,251,0.92);
  backdrop-filter:blur(24px);
  -webkit-backdrop-filter:blur(24px);
  border-bottom:1px solid var(--border);
  box-shadow:0 2px 20px rgba(0,0,0,0.06);
}
.nav-wrap{
  max-width:1180px;margin:0 auto;padding:0 36px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-logo{
  display:flex;align-items:center;gap:10px;
  font-family:var(--ff-display);font-weight:800;font-size:.88rem;
  color:var(--text);letter-spacing:.01em;line-height:1.2;
}
.nav-logo-pip{
  width:9px;height:9px;border-radius:50%;flex-shrink:0;
  background:var(--teal);box-shadow:0 0 10px var(--teal);
  animation:pip 2.4s infinite ease-in-out;
}
@keyframes pip{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(.65)}}
.nav-logo-text{display:flex;flex-direction:column;gap:0px}
.nav-logo-abbr{font-size:.95rem;font-weight:800;color:var(--teal);letter-spacing:.04em}
.nav-logo-full{font-size:.6rem;color:var(--muted);font-weight:500;letter-spacing:.02em;line-height:1.3;max-width:240px}

.nav-links{display:flex;align-items:center;gap:18px}
.nav-links a{
  font-size:.75rem;font-weight:500;color:var(--muted);
  transition:color .3s;position:relative;letter-spacing:.001em;
}
.nav-links a::after{
  content:'';position:absolute;bottom:-3px;left:0;
  width:0;height:1.5px;background:var(--teal);
  transition:width .3s var(--ease);
}
.nav-links a:hover,.nav-links a.active{color:var(--text)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}

.nav-cta{
  padding:8px 18px;
  border:1.5px solid var(--teal);
  border-radius:100px;
  font-size:.8rem;font-weight:600;
  color:var(--teal)!important;
  background:var(--teal-dim);
  transition:all .3s!important;
}
.nav-cta:hover{background:var(--teal)!important;color:var(--white)!important;box-shadow:0 4px 18px var(--teal-glow)}
.nav-cta::after{display:none!important}

.hamburger{display:none;flex-direction:column;gap:5px;width:26px}
.hamburger span{display:block;height:1.5px;background:var(--text);border-radius:2px;transition:all .35s 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)}

#mobile-menu{
    display:none;
    position:fixed;
    top:0;
    left:0;
    width:100vw;
    height:100vh;

    background:rgba(248,250,251,.98);
    backdrop-filter:blur(20px);

    z-index:9999;

    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:28px;

    opacity:0;
    transform:translateY(-12px);
    transition:opacity .4s ease, transform .4s ease;
}

#mobile-menu.open{
    display:flex;
    opacity:1;
    transform:translateY(0);
}

/* ---- LAYOUT ---- */
.container{max-width:1180px;margin:0 auto;padding:0 36px}
section{position:relative}

/* ---- EYEBROW ---- */
.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}
.reveal.d5{transition-delay:.40s}

/* ---- BUTTONS ---- */
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 26px;background:var(--teal);color:var(--white);
  border-radius:100px;font-weight:700;font-size:.875rem;
  transition:all .3s var(--ease);position:relative;overflow:hidden;
}
.btn-primary::before{
  content:'';position:absolute;inset:0;
  background:linear-gradient(135deg,rgba(255,255,255,.25),transparent);
  opacity:0;transition:opacity .3s;
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 28px var(--teal-glow)}
.btn-primary:hover::before{opacity:1}

.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(--bg1);
  transition:all .3s var(--ease);
}
.btn-ghost:hover{border-color:var(--teal);color:var(--teal);transform:translateY(-2px);box-shadow:0 4px 18px var(--teal-glow)}

/* ---- CARDS ---- */
.glass-card{
  border:1px solid var(--border);border-radius:var(--r-xl);
  background:var(--bg1);
  transition:border-color .3s,transform .35s var(--ease),box-shadow .35s;
}
.glass-card:hover{
  border-color:rgba(0,151,178,.25);transform:translateY(-4px);
  box-shadow:0 16px 44px rgba(0,0,0,.1);
}

/* ---- 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(--bg1);
  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;letter-spacing:.08em;
}

/* ---- FOOTER ---- */
#footer{
  padding:68px 0 32px;
  background:var(--text);
  border-top:1px solid rgba(255,255,255,0.06);
  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:#fff;margin-bottom:6px}
.footer-brand-abbr{font-size:.72rem;color:var(--teal);font-family:var(--ff-mono);letter-spacing:.08em;margin-bottom:10px}
.footer-brand-desc{font-size:.84rem;color:rgba(255,255,255,.45);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 rgba(255,255,255,.1);
  border-radius:8px;display:flex;align-items:center;justify-content:center;
  color:rgba(255,255,255,.4);transition:all .3s;
}
.footer-social:hover{border-color:var(--teal);color:var(--teal);background:var(--teal-dim)}
.footer-social svg{width:14px;height:14px}
.footer-col-title{font-family:var(--ff-display);font-size:.82rem;font-weight:700;color:rgba(255,255,255,.7);margin-bottom:16px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:.82rem;color:rgba(255,255,255,.38);transition:color .3s}
.footer-links a:hover{color:rgba(255,255,255,.8)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:24px;border-top:1px solid rgba(255,255,255,.07);
  font-size:.76rem;color:rgba(255,255,255,.28);
}

/* ---- PAGE HERO SHARED ---- */
.page-hero{
  padding:150px 0 90px;
  background:linear-gradient(150deg,var(--bg0) 0%,#E8F5F8 100%);
  border-bottom:1px solid var(--border);
  position:relative;overflow:hidden;
}
.page-hero-bg{
  position:absolute;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(ellipse 70% 60% at 70% 50%,rgba(0,151,178,.07) 0%,transparent 70%);
}
.page-hero-inner{position:relative;z-index:1}

/* ---- 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,.1);border:1px solid rgba(0,114,198,.25);color:#0072C6}
.pb-elsevier{background:rgba(220,90,0,.1);border:1px solid rgba(220,90,0,.22);color:#DC5A00}
.pb-springer{background:rgba(0,140,0,.1);border:1px solid rgba(0,140,0,.22);color:#008C00}
.pb-wiley  {background:rgba(90,70,210,.1);border:1px solid rgba(90,70,210,.22);color:#5A46D2}
.pb-mdpi   {background:rgba(0,151,178,.1);border:1px solid rgba(0,151,178,.22);color:var(--teal-dark)}
.pb-acm    {background:rgba(200,40,40,.1);border:1px solid rgba(200,40,40,.22);color:#C82828}

/* ---- 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){
  .nav-links{display:none}
  .hamburger{display:flex}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media(max-width:640px){
  .container{padding:0 18px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;gap:10px;text-align:center}
}

/* ---- NAV OVERFLOW (9 links) ---- */
.nav-links{flex-wrap:nowrap;overflow:hidden}
@media(max-width:1200px){
  .nav-links a{font-size:.75rem}
  .nav-links{gap:18px}
  .nav-wrap{padding:0 24px}
}
@media(max-width:1060px){
  .nav-links{display:none}
  .hamburger{display:flex}
}
/* Portrait badge light-mode fix */
.portrait-badge{
  background:rgba(248,250,251,.94)!important;
  border-color:var(--border)!important;
}
.pb-name{color:var(--text)!important}
.pb-role{color:var(--teal)!important}
.pb-inst{color:var(--muted)!important}

/* =====================================================
   DARK MODE — toggled via data-theme="dark" on <html>
   ===================================================== */
[data-theme="dark"] {
  --bg0:    #06080F;
  --bg1:    #0A0D17;
  --bg2:    #0F1220;
  --bg3:    #151929;
  --surface:  rgba(255,255,255,0.03);
  --surface2: rgba(255,255,255,0.06);
  --border:   rgba(255,255,255,0.07);
  --border2:  rgba(0,220,255,0.2);
  --teal:      #00DCF0;
  --teal-dark: #00A8C0;
  --teal-glow: rgba(0,220,240,0.22);
  --teal-dim:  rgba(0,220,240,0.09);
  --violet:    #7B5CF5;
  --white:  #FFFFFF;
  --text:   #DDE4EF;
  --text2:  #BCC8D8;
  --muted:  #7A8499;
  --muted2: #4A5262;
}
[data-theme="dark"] body { background: var(--bg0); color: var(--text); }
[data-theme="dark"] #navbar.scrolled { background: rgba(6,8,15,0.88); }
[data-theme="dark"] #mobile-menu { background: rgba(6,8,15,.97); }
[data-theme="dark"] .hamburger span { background: var(--white); }
[data-theme="dark"] #footer { background: #03050C; }
[data-theme="dark"] .page-hero { background: linear-gradient(150deg,var(--bg0) 0%,var(--bg2) 100%); }
[data-theme="dark"] .nav-logo { color: var(--white); }
[data-theme="dark"] .portrait-badge { background: rgba(6,8,15,.88)!important; }
[data-theme="dark"] .pb-name { color: var(--white)!important; }
[data-theme="dark"] .terminal { border-color: rgba(255,255,255,.05); }

/* Dark mode toggle button */
.theme-toggle {
  width: 36px; height: 36px;
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted);
  background: var(--surface);
  cursor: pointer;
  transition: all .3s;
  flex-shrink: 0;
}
.theme-toggle:hover { border-color: var(--border2); color: var(--teal); background: var(--teal-dim); }
.theme-toggle svg { width: 16px; height: 16px; }

/* =====================================================
   SMOOTH SCROLL BEHAVIOUR
   ===================================================== */
html { scroll-behavior: smooth; }
::selection { background: var(--teal-dim); color: var(--text); }

/* =====================================================
   ACCESSIBILITY 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: 9999; text-decoration: none;
  transition: top .2s;
}
.skip-link:focus { top: 0; }

/* =====================================================
   ANIMATED PAGE TRANSITIONS
   ===================================================== */
.page-transition {
  animation: pageReveal .5s var(--ease) both;
}
@keyframes pageReveal {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =====================================================
   PRINT STYLES
   ===================================================== */
@media print {
  #navbar, #mobile-menu, .scroll-progress, #cursor-glow,
  .theme-toggle, .skip-link, .hero-ctas, #footer { display: none !important; }
  body { background: #fff !important; color: #000 !important; font-size: 11pt; }
  .container { max-width: 100%; padding: 0; }
  a { color: inherit; }
  .section-title { font-size: 16pt; }
  .glass-card, .pub-card, .rf-card { border: 0.5pt solid #ddd !important; box-shadow: none !important; }
}

/* ---- CANVAS-BG PAGES: card semi-transparency ---- */
.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 {
  background: rgba(255,255,255,0.88) !important;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
[data-theme="dark"] .glass-card,
[data-theme="dark"] .course-card,
[data-theme="dark"] .tc,
[data-theme="dark"] .rf-card,
[data-theme="dark"] .hi-card,
[data-theme="dark"] .achievement-item,
[data-theme="dark"] .cert-row,
[data-theme="dark"] .ach-item,
[data-theme="dark"] .sup-card,
[data-theme="dark"] .activity-item,
[data-theme="dark"] .position-card,
[data-theme="dark"] .article-card,
[data-theme="dark"] .ds-card,
[data-theme="dark"] .sw-card,
[data-theme="dark"] .grant-card,
[data-theme="dark"] .testimonial,
[data-theme="dark"] .funder-card,
[data-theme="dark"] .talk-item,
[data-theme="dark"] .expect-card,
[data-theme="dark"] .profile-card {
  background: rgba(10,13,23,0.88) !important;
}

/* =====================================================
   PAGE-HERO CANVAS POSITIONING (hero-canvases.js)
   ===================================================== */
.page-hero {
  position: relative !important;
  overflow: hidden;
}
.page-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}
.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;
}
/* Ensure page-hero text stays readable over canvas */
.page-hero .section-title { text-shadow: 0 1px 12px rgba(248,250,251,0.8); }
.page-hero .section-desc  { text-shadow: 0 1px 8px rgba(248,250,251,0.6); }
.page-hero .eyebrow       { }
[data-theme="dark"] .page-hero .section-title { text-shadow: 0 1px 16px rgba(6,8,15,0.9); }
[data-theme="dark"] .page-hero .section-desc  { text-shadow: 0 1px 10px rgba(6,8,15,0.8); }

/* =====================================================
   3D MOTION ENGINE — GSAP + Three.js
   Additional CSS to support motion.js effects
   ===================================================== */

/* Smooth 3D card transitions */
.card-3d {
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.15s ease, box-shadow 0.35s ease !important;
  backface-visibility: hidden;
}

/* Cursor trail dots hidden on touch */
@media (pointer: coarse) {
  [style*="border-radius:50%;background:rgba(0,151,178"] { display: none !important; }
}

/* Page transition curtain */
body > div[style*="scaleY"] {
  position: fixed; inset: 0;
  background: var(--teal);
  z-index: 9990;
}

/* GSAP word splits */
.hero-3d-word {
  display: inline-block;
  transform-origin: top center;
  backface-visibility: hidden;
}

/* Three.js canvas layer */
canvas[data-three-hero],
canvas[data-three-inner] {
  position: absolute !important;
  inset: 0 !important;
  z-index: 0 !important;
  pointer-events: none;
  opacity: 0.75;
}

/* Smooth scroll for GSAP ScrollTrigger */
html.lenis, html.lenis body {
  height: auto;
}

/* Floating animation */
@keyframes float-gentle {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-10px); }
}
.float-3d { animation: float-gentle 4s ease-in-out infinite; }

/* Ripple effect */
.ripple {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  background: rgba(0, 151, 178, 0.25);
  transform: scale(0);
  animation: ripple-anim 0.65s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
@keyframes ripple-anim {
  to { transform: scale(4); opacity: 0; }
}

/* 3D entrance animation */
@keyframes enter3d {
  from { opacity: 0; transform: translateY(40px) translateZ(-60px) rotateX(8deg); }
  to   { opacity: 1; transform: translateY(0) translateZ(0) rotateX(0deg); }
}

/* Magnetic buttons feel */
.btn-primary, .btn-ghost, .nav-cta, .sch-link {
  transition: transform 0.2s cubic-bezier(0.34,1.56,0.64,1), box-shadow 0.3s ease !important;
}

/* Smooth 3D nav scale */
#navbar {
  transform-origin: center top;
  will-change: transform;
}

/* Glow on hover for cards with 3D tilt */
.pub-card.card-3d:hover,
.rf-card.card-3d:hover,
.sw-card.card-3d:hover {
  box-shadow:
    0 24px 60px rgba(0, 151, 178, 0.16),
    0 0 0 1px rgba(0, 151, 178, 0.1),
    0 4px 16px rgba(0, 0, 0, 0.08) !important;
}

/* 3D stat card entrance */
.hstat, .stat-cell, .ctr-card {
  transform-origin: center bottom;
  backface-visibility: hidden;
}