/* ---- Core Tokens (Light Default) ---- */
:root {
  --text: #1d1f23;
  --muted: #5d636b;
  --bg: #f6f7f9;
  --bg-alt: #f0f2f5;
  --card: #ffffff;
  --border: #e3e6ea;
  --accent: #10a37f;
  --accent-rgb: 16,163,127;
  --success: #0f8e68;
  --warning: #b88700;
  --danger: #c9342c;
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --focus-ring: 2px solid rgba(var(--accent-rgb), .55);
  --transition: .25s cubic-bezier(.4,0,.2,1);
  --shadow-xs: 0 1px 2px rgba(0,0,0,.04);
  --shadow-sm: 0 2px 4px rgba(0,0,0,.06);
  --shadow-focus: 0 0 0 3px rgba(var(--accent-rgb), .25);
  --container: 1040px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 40px;
  --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  --line-height: 1.55;
}

/* ---- Automatic Dark Mode Detection (System Preference) ---- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --text: #f1f5f7;
    --muted: #9aa2ab;
    --bg: #121417;
    --bg-alt: #181c21;
    --card: #1d1f23;
    --border: #2a2f35;
    --accent: #10a37f;
    --accent-rgb: 16,163,127;
    --success:#1aa078;
    --danger:#e24c43;
    --shadow-xs: 0 1px 2px rgba(0,0,0,.55);
    --shadow-sm: 0 2px 6px rgba(0,0,0,.55);
  }
}

/* ---- Manual Dark Mode Override ---- */
[data-theme="dark"] {
  --text: #f1f5f7;
  --muted: #9aa2ab;
  --bg: #121417;
  --bg-alt: #181c21;
  --card: #1d1f23;
  --border: #2a2f35;
  --accent: #10a37f;
  --accent-rgb: 16,163,127;
  --success:#1aa078;
  --danger:#e24c43;
  --shadow-xs: 0 1px 2px rgba(0,0,0,.55);
  --shadow-sm: 0 2px 6px rgba(0,0,0,.55);
}

/* ---- Base ---- */
html { scroll-behavior: smooth; }
* { margin:0; padding:0; box-sizing:border-box; }
body {
  font-family: var(--font-stack);
  background: var(--bg);
  color: var(--text);
  line-height: var(--line-height);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width:100%; display:block; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover, a:focus-visible { text-decoration: underline; }

.skip-link {
  position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skip-link:focus {
  left:16px; top:16px; width:auto; height:auto;
  background:var(--card); color:var(--text);
  padding:8px 12px; border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  z-index: 2000;
}

:where(section[id]) { scroll-margin-top: 92px; }

/* Focus */
:where(a, button, .inline-copy-btn):focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---- Layout ---- */
.container { max-width: var(--container); margin-inline:auto; padding-inline: var(--space-5); }

.hero-section {
  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  padding: var(--space-6) var(--space-5) var(--space-5);
  margin-top: 84px;
}

/* ---- Navbar ---- */
.navbar {
  position:fixed; top:0; left:0; right:0;
  display:flex; justify-content:space-between; align-items:center;
  padding: 10px 20px;
  background: rgba(255,255,255,.7);
  backdrop-filter: blur(12px);
  border-bottom:1px solid var(--border);
  z-index:1000;
}

/* Update navbar background for automatic dark mode */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .navbar {
    background: rgba(29,31,35,.7);
  }
}

[data-theme="dark"] .navbar {
  background: rgba(29,31,35,.7);
}

.nav-left { display:flex; align-items:center; gap:12px; }
.nav-brand {
  font-weight:600; font-size: 1rem; letter-spacing:.5px;
  color: var(--text);
}

.nav-links {
  display:flex; gap:20px; align-items:center;
}
.nav-links a {
  position:relative;
  padding:6px 4px;
  font-size:.9rem;
  color: var(--muted);
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.nav-links a.active::after {
  content:'';
  position:absolute;
  left:4px; right:4px; bottom:0;
  height:2px; background: var(--accent);
  border-radius:2px;
  opacity:.9;
}

.nav-toggle {
  display:none;
  flex-direction:column;
  gap:4px;
  border:1px solid var(--border);
  background: var(--card);
  padding:6px 8px;
  border-radius: var(--radius-sm);
  cursor:pointer;
  transition: background var(--transition), border-color var(--transition);
}
.nav-toggle:hover { background: var(--bg-alt); }
.nav-toggle .bar {
  width:20px; height:2px; background: var(--text); border-radius: 2px;
  transition: transform .35s, opacity .25s;
}
.nav-toggle[aria-expanded="true"] .bar:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .bar:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .bar:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

/* Theme toggle button */
.ghost-btn {
  background: var(--card);
  border:1px solid var(--border);
  color: var(--muted);
  padding:6px 10px;
  font-size:.8rem;
  border-radius: var(--radius-sm);
  cursor:pointer;
  display:inline-flex; align-items:center; gap:6px;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.ghost-btn:hover { background: var(--bg-alt); color: var(--text); }

/* Update ghost button hover for automatic dark mode */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .ghost-btn:hover { background: #242a30; }
}

[data-theme="dark"] .ghost-btn:hover { background: #242a30; }

/* ---- Headings ---- */
.main-title {
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  font-weight:600;
  letter-spacing:-0.5px;
  margin-bottom: 10px;
  color: var(--text);
}
.subtitle {
  max-width: 680px;
  color: var(--muted);
  font-size: .95rem;
  margin-bottom: 36px;
  font-style: normal;
}

/* ---- Buttons ---- */
.social-buttons {
  display:flex; flex-wrap:wrap; justify-content:center;
  gap:12px;
  margin-bottom: 46px;
}

.btn {
  --btn-bg: var(--card);
  --btn-border: var(--border);
  --btn-text: var(--text);
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 16px;
  font-size:.85rem;
  font-weight:500;
  text-decoration:none;
  border:1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-text);
  border-radius: var(--radius-sm);
  position:relative;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.btn:hover {
  background: var(--bg-alt);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.btn:active { transform: translateY(0); }

.btn-accent {
  --btn-bg: var(--accent);
  --btn-border: var(--accent);
  --btn-text: #fff;
}
.btn-accent:hover { background: #0e8f6f; }

.btn-outline { --btn-bg: var(--card); --btn-text: var(--text); }

.btn-soft {
  --btn-bg: rgba(var(--accent-rgb), .08);
  --btn-border: rgba(var(--accent-rgb), .15);
  --btn-text: var(--accent);
}
.btn-soft:hover { background: rgba(var(--accent-rgb), .15); }

/* Secondary buttons (LinkedIn, Scholar, Email) - outlined style */
.btn-scholar {
  background: transparent;
  border: 1px solid rgba(var(--accent-rgb), 0.6);
  color: rgba(var(--accent-rgb), 0.8);
  box-shadow: 0 0 0 0 rgba(16, 163, 127, 0);
  transition: all var(--transition);
}
.btn-scholar:hover,
.btn-scholar:focus-visible {
  background: rgba(var(--accent-rgb), .06);
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
  box-shadow: 0 0 0 4px rgba(16, 163, 127, 0.12), 0 4px 12px rgba(16, 163, 127, 0.15);
}

.btn-email {
  background: transparent;
  border: 1px solid rgba(var(--accent-rgb), 0.6);
  color: rgba(var(--accent-rgb), 0.8);
  box-shadow: 0 0 0 0 rgba(16, 163, 127, 0);
  transition: all var(--transition);
}
.btn-email:hover,
.btn-email:focus-visible {
  background: rgba(var(--accent-rgb), .06);
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
  box-shadow: 0 0 0 4px rgba(16, 163, 127, 0.12), 0 4px 12px rgba(16, 163, 127, 0.15);
}

/* Primary CTA button (CV) - teal accent with gradient */
.btn-cv {
  background: linear-gradient(135deg, #009C7A 0%, #0984E3 100%);
  border: 1px solid #009C7A;
  color: #ffffff;
  font-weight: 600;
  border-radius: 10px;
  box-shadow: 0 0 0 0 rgba(0, 156, 122, 0);
  transition: all var(--transition);
}
.btn-cv:hover,
.btn-cv:focus-visible {
  background: linear-gradient(135deg, #00B894 0%, #0A8FE6 100%);
  border-color: #00B894;
  color: #ffffff;
  text-decoration: none;
  box-shadow: 0 0 0 4px rgba(0, 156, 122, 0.15), 0 6px 20px rgba(0, 156, 122, 0.25);
  transform: translateY(-2px);
}

/* LinkedIn button - secondary outlined style */
.btn-linkedin {
  background: transparent;
  border: 1px solid rgba(var(--accent-rgb), 0.6);
  color: rgba(var(--accent-rgb), 0.8);
  box-shadow: 0 0 0 0 rgba(16, 163, 127, 0);
  transition: all var(--transition);
}
.btn-linkedin:hover,
.btn-linkedin:focus-visible {
  background: rgba(var(--accent-rgb), .06);
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
  box-shadow: 0 0 0 4px rgba(16, 163, 127, 0.12), 0 4px 12px rgba(16, 163, 127, 0.15);
}

/* Inline copy mini button */
.inline-copy-btn {
  background: transparent;
  border:none;
  color: inherit;
  cursor:pointer;
  padding:2px 4px;
  border-radius: var(--radius-sm);
  font-size:.75rem;
  display:inline-flex; align-items:center;
  transition: background var(--transition);
  position:absolute; top:4px; right:4px;
  opacity:.75;
}
.inline-copy-btn:hover { background: var(--bg-alt); opacity:1; }

.copy-feedback {
  position:absolute;
  top:-6px; right:8px;
  transform:translateY(-100%);
  background: var(--card);
  color: var(--text);
  padding:4px 6px;
  font-size: .6rem;
  border-radius: var(--radius-sm);
  border:1px solid var(--border);
  box-shadow: var(--shadow-sm);
  animation: fadeSlide .9s both;
  pointer-events:none;
}
@keyframes fadeSlide {
  0% {opacity:0; transform:translateY(-4px);}
  15% {opacity:1; transform:translateY(-100%);}
  85% {opacity:1;}
  100% {opacity:0; transform:translateY(-6px);}
}

/* ---- Sections ---- */
.content-section {
  width:100%;
  max-width: 860px;
  margin: 56px 0;
  text-align:left;
}
.content-section h2 {
  font-size:1.4rem;
  font-weight:600;
  text-align:center;
  margin-bottom: 28px;
  letter-spacing:-0.5px;
  color: var(--text);
  position:relative;
}
.content-section h2::after {
  content:'';
  position:absolute;
  left:50%; transform:translateX(-50%);
  bottom:-10px;
  width:56px; height:2px;
  background: var(--accent);
  border-radius:2px;
  opacity:.45;
}

.education-list, .experience-list { display:flex; flex-direction:column; gap:18px; }

.education-item, .experience-item, .publication-item, .award-item, .skill-category {
  background: var(--card);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:18px 18px 14px;
  position:relative;
  box-shadow: var(--shadow-xs);
  transition: border-color var(--transition), background var(--transition), transform .25s;
}
.education-item:hover,
.experience-item:hover,
.publication-item:hover,
.award-item:hover,
.skill-category:hover {
  border-color: rgba(var(--accent-rgb), .45);
  transform: translateY(-2px);
  background: var(--card);
}

.education-header, .experience-header, .education-details, .experience-details {
  display:flex; justify-content:space-between; align-items:center;
  gap:12px; flex-wrap:wrap;
  margin-bottom:6px;
}

.education-header h3,
.experience-header h3 { font-size:.95rem; font-weight:600; color: var(--text); }

.location { color: var(--muted); font-style:italic; font-size:.75rem; }
.degree, .role { font-weight:500; color: var(--accent); font-size:.85rem; }
.year { font-size:.7rem; color: var(--muted); font-weight:500; }

.courses, .thesis, .awards, .education-item .awards, .experience-item ul li, .award-item p {
  font-size:.8rem;
  color: var(--muted);
  line-height:1.45;
  margin-bottom:6px;
}
.thesis { font-style:italic; color: var(--accent); }

.publications-list { 
  display:flex; 
  flex-direction:column; 
  gap:18px; 
  max-width: 1000px;
  margin: 0 auto;
}
.publication-item { 
  padding:18px 18px 14px; 
  border-radius: var(--radius);
  background: var(--card);
  border:1px solid var(--border);
  box-shadow: var(--shadow-xs);
  transition: border-color var(--transition), background var(--transition), transform .25s;
}
.publication-item:hover {
  border-color: rgba(var(--accent-rgb), .45);
  transform: translateY(-2px);
  background: var(--card);
}
.publication-link { 
  font-weight: 600;
  font-size: .95rem;
  color: var(--text);
}

.filter-controls {
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  justify-content:center;
  margin-bottom:20px;
}
.filter-btn {
  background: var(--card);
  border:1px solid var(--border);
  font-size:.65rem;
  letter-spacing:.7px;
  padding:6px 12px;
  border-radius: 999px;
  cursor:pointer;
  text-transform:uppercase;
  font-weight:600;
  color: var(--muted);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.filter-btn:hover { background: var(--bg-alt); color: var(--text); }
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color:#fff;
}

.experience-item ul {
  list-style:none;
  padding-left:0;
  margin-top:4px;
  max-height:0;
  overflow:hidden;
  transition:max-height .5s ease;
}
.experience-item.expanded ul { max-height:480px; }
.experience-item li { position:relative; padding-left:14px; }
.experience-item li::before {
  content:'';
  position:absolute;
  left:0; top=.55em;
  width:6px; height:6px;
  background: var(--accent);
  border-radius:50%;
  opacity:.7;
}
.collapse-toggle {
  background: var(--bg-alt);
  border:1px solid var(--border);
  padding:6px 10px;
  font-size:.6rem;
  letter-spacing:.8px;
  border-radius: var(--radius-sm);
  text-transform:uppercase;
  font-weight:600;
  cursor:pointer;
  color: var(--muted);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  margin-top:4px;
}
.collapse-toggle.locked { display:none; }
.experience-item.expanded .collapse-toggle {
  background: var(--accent);
  border-color: var(--accent);
  color:#fff;
}

.skills-grid {
  display:grid;
  gap:16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.skill-category h4 {
  font-size: .85rem;
  margin-bottom:4px;
  font-weight:600;
  color: var(--text);
}
.skill-category p { font-size:.75rem; color: var(--muted); }

/* Awards */
.awards-list { display:flex; flex-direction:column; gap:10px; }
.award-item { padding:14px 16px; border-radius: var(--radius-sm); }

/* Publication action buttons */
.pub-actions {
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin-top:10px;
}
.pub-btn {
  --pub-border: var(--border);
  background: var(--card);
  border:1px solid var(--pub-border);
  color: var(--muted);
  font-size:.65rem;
  letter-spacing:.6px;
  text-transform:uppercase;
  padding:6px 10px;
  border-radius: 999px;
  font-weight:600;
  line-height:1;
  display:inline-flex;
  align-items:center;
  gap:6px;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform .18s;
}
.pub-btn:hover,
.pub-btn:focus-visible {
  background: var(--bg-alt);
  color: var(--text);
  text-decoration:none;
}
.pub-btn-accent {
  background: rgba(var(--accent-rgb), .08);
  border-color: rgba(var(--accent-rgb), .35);
  color: var(--accent);
}
.pub-btn-accent:hover,
.pub-btn-accent:focus-visible {
  background: rgba(var(--accent-rgb), .14);
  color: var(--accent);
  border-color: var(--accent);
}
[data-theme="dark"] .pub-btn {
  background: var(--card);
}

@media (max-width:480px){
  .pub-actions { gap:6px; }
  .pub-btn { font-size:.6rem; padding:5px 9px; }
}

/* Reveal Animations */
.reveal {
  opacity:0;
  transform:translateY(14px);
  transition: opacity .5s var(--transition), transform .5s var(--transition);
}
.reveal.visible {
  opacity:1;
  transform:translateY(0);
}

/* Back To Top */
.back-to-top {
  position:fixed;
  bottom:24px; right:24px;
  width:40px; height:40px;
  border-radius:50%;
  border:1px solid var(--border);
  background: var(--card);
  color: var(--accent);
  cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  box-shadow: var(--shadow-sm);
  opacity:0; pointer-events:none;
  transform:translateY(8px);
  transition: opacity .4s, transform .4s, background var(--transition);
  z-index:900;
}
.back-to-top:hover { background: var(--bg-alt); }
.back-to-top.show {
  opacity:1; pointer-events:auto; transform:translateY(0);
}

/* Utility */
.muted { color: var(--muted); }

/* Background visual container */
.bg-visual {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
#gdCanvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  /* Prefer dynamic viewport unit to track visible space without causing innerHeight churn problems.
     Fallback chain: dvh (new) → svh (small viewport) → vh. */
  height: 100dvh;
  height: 100svh;
  height: 100vh;
  display: block;
  z-index: 0;
  pointer-events: none;
  transform: none !important;
  /* Slightly crisper on mobile; tweak if too strong */
  image-rendering: optimizeQuality;
}
@supports (height: 100dvh) {
  /* Optional: if you want to anchor to large viewport instead:
  #gdCanvas { height: 100lvh; }
  */
}
@media (prefers-color-scheme: dark) {
  #gdCanvas { opacity: 0.62; }
}
@media (prefers-reduced-motion: reduce) {
  #gdCanvas { opacity: 0.35; }
}
.navbar, main, #backToTop { position: relative; z-index: 1; }

/* Page bounce animation (added) */
@keyframes pageBounce {
  0% { transform: translateY(0); }
  20% { transform: translateY(-18px); }
  40% { transform: translateY(0); }
  55% { transform: translateY(-8px); }
  70% { transform: translateY(0); }
  100% { transform: translateY(0); }
}
body.page-bounce { animation: pageBounce 0.9s cubic-bezier(.34,1.56,.64,1); }

/* ---- Responsive ---- */
@media (max-width: 880px) {
  .nav-toggle { display:flex; }
  .nav-links {
    position:absolute;
    top:100%; left:0; right:0;
    background: var(--card);
    border:1px solid var(--border);
    border-left: none;
    border-right: none;
    flex-direction: row;
    align-items: center;
    padding: 12px 0;
    border-radius: 0;
    box-shadow: var(--shadow-sm);
    min-width: unset;
    width: 100%;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity .35s, transform .4s;
    
    /* Enable horizontal scrolling */
    overflow-x: auto;
    overflow-y: hidden;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
  }
  
  /* Hide scrollbar for webkit browsers */
  .nav-links::-webkit-scrollbar {
    display: none;
  }
  
  .nav-links.show {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  
  .nav-links a {
    flex-shrink: 0;
    padding: 8px 16px;
    margin: 0 4px;
    border-radius: var(--radius-sm);
    font-size: .85rem;
    white-space: nowrap;
    transition: background var(--transition), color var(--transition);
  }
  
  .nav-links a:first-child {
    margin-left: 20px;
  }
  
  .nav-links a:last-child {
    margin-right: 20px;
  }
  
  .nav-links a:hover {
    background: var(--bg-alt);
  }
  
  .nav-links a.active {
    background: rgba(var(--accent-rgb), .1);
    color: var(--accent);
  }
  
  .nav-links a.active::after {
    display: none; /* Remove the bottom border indicator */
  }
  
  /* Theme toggle button in mobile nav */
  .nav-links .ghost-btn {
    flex-shrink: 0;
    margin: 0 4px;
    padding: 8px 12px;
    font-size: .8rem;
    white-space: nowrap;
  }
  
  .nav-links .ghost-btn:last-child {
    margin-right: 20px;
  }
  
  .hero-section { padding: 72px 20px 40px; }
}

/* ---- Tablet Specific (iPad, Android tablets) ---- */
@media (min-width: 561px) and (max-width: 880px) {
  .nav-links {
    padding: 14px 0;
  }
  
  .nav-links a {
    padding: 10px 20px;
    margin: 0 6px;
    font-size: .9rem;
  }
  
  .nav-links a:first-child {
    margin-left: 32px;
  }
  
  .nav-links a:last-child,
  .nav-links .ghost-btn:last-child {
    margin-right: 32px;
  }
  
  .nav-links .ghost-btn {
    margin: 0 6px;
    padding: 10px 16px;
    font-size: .85rem;
  }
  
  .hero-section {
    padding: 80px 32px 48px;
    margin-top: 88px;
  }
  
  .main-title {
    font-size: clamp(2.1rem, 4.5vw, 2.6rem);
    margin-bottom: 14px;
  }
  
  .subtitle {
    font-size: 1rem;
    max-width: 720px;
    margin-bottom: 40px;
  }
  
  .social-buttons {
    gap: 16px;
    margin-bottom: 52px;
  }
  
  .btn {
    padding: 12px 20px;
    font-size: .9rem;
  }
  
  .content-section {
    margin: 64px 0;
    max-width: 760px;
  }
  
  .content-section h2 {
    font-size: 1.5rem;
    margin-bottom: 32px;
  }
  
  .education-item, .experience-item, .publication-item, .award-item, .skill-category {
    padding: 20px 22px 18px;
  }
  
  .education-header h3,
  .experience-header h3 {
    font-size: 1rem;
  }
  
  .degree, .role {
    font-size: .9rem;
  }
  
  .courses, .thesis, .awards, .education-item .awards, .experience-item ul li, .award-item p {
    font-size: .85rem;
  }
  
  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
  }
  
  .skill-category h4 {
    font-size: .9rem;
  }
  
  .skill-category p {
    font-size: .8rem;
  }
  
  .filter-controls {
    gap: 10px;
    margin-bottom: 24px;
  }
  
  .filter-btn {
    padding: 8px 16px;
    font-size: .7rem;
  }
  
  .pub-btn {
    padding: 7px 12px;
    font-size: .7rem;
  }
  
  .publication-item {
    padding: 16px 20px;
  }
  
  .back-to-top {
    width: 48px;
    height: 48px;
    bottom: 32px;
    right: 32px;
  }
  
  .bg-footnote {
    bottom: 16px;
    left: 16px;
    max-width: 280px;
  }
  
  .bg-footnote-text {
    padding: 8px 10px;
  }
}

/* ---- Tablet Landscape Specific ---- */
@media (min-width: 769px) and (max-width: 1024px) and (orientation: landscape) {
  .hero-section {
    padding: 60px 40px 36px;
    margin-top: 92px;
  }
  
  .main-title {
    font-size: 2.2rem;
  }
  
  .subtitle {
    font-size: .98rem;
    margin-bottom: 36px;
  }
  
  .social-buttons {
    flex-direction: row;
    gap: 14px;
    margin-bottom: 44px;
  }
  
  .content-section {
    margin: 56px 0;
  }
}

/* ---- Large Tablet/Small Desktop ---- */
@media (min-width: 881px) and (max-width: 1024px) {
  .container {
    max-width: 960px;
    padding-inline: 32px;
  }
  
  .hero-section {
    padding: 88px 32px 56px;
  }
  
  .content-section {
    max-width: 800px;
  }
  
  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }
}

@media (max-width: 560px) {
  .social-buttons { flex-direction:column; width:100%; max-width:340px; }
  .btn { width:100%; justify-content:center; }
  .education-details, .experience-details { flex-direction:column; align-items:flex-start; }
  .content-section { margin:48px 0; }
  
  /* Smaller mobile adjustments for horizontal nav */
  .nav-links a:first-child {
    margin-left: 16px;
  }
  
  .nav-links a:last-child,
  .nav-links .ghost-btn:last-child {
    margin-right: 16px;
  }
  
  .nav-links a {
    padding: 8px 14px;
    font-size: .8rem;
  }
  
  .nav-links .ghost-btn {
    padding: 8px 12px;
    font-size: .75rem;
  }
}

@media (max-width: 400px) {
  .main-title { font-size:1.9rem; }
  .subtitle { font-size:.85rem; }
  
  /* Very small mobile adjustments */
  .nav-links a:first-child {
    margin-left: 12px;
  }
  
  .nav-links a:last-child,
  .nav-links .ghost-btn:last-child {
    margin-right: 12px;
  }
  
  .nav-links a {
    padding: 8px 12px;
    margin: 0 2px;
  }
  
  .nav-links .ghost-btn {
    margin: 0 2px;
    padding: 8px 10px;
  }
}

/* ---- Canvas Tablet Optimizations ---- */
@media (min-width: 561px) and (max-width: 1024px) {
  #gdCanvas {
    /* Reduce opacity slightly on tablets for better readability */
    opacity: 0.85;
  }
  
  @media (prefers-color-scheme: dark) {
    #gdCanvas { 
      opacity: 0.65; 
    }
  }
  
  [data-theme="dark"] #gdCanvas {
    opacity: 0.65;
  }
}

/* ---- Touch-friendly improvements for tablets ---- */
@media (min-width: 561px) and (max-width: 1024px) and (hover: none) {
  .btn:hover {
    /* Disable hover transform on touch devices */
    transform: none;
  }
  
  .education-item:hover,
  .experience-item:hover,
  .publication-item:hover,
  .award-item:hover,
  .skill-category:hover {
    /* Reduce hover effects on touch devices */
    transform: translateY(-1px);
  }
  
  .back-to-top:hover {
    transform: none;
  }
  
  .bg-footnote-toggle:hover {
    transform: none;
  }
  
  /* Make interactive elements more touch-friendly */
  .nav-toggle {
    padding: 8px 10px;
  }
  
  .ghost-btn {
    padding: 8px 12px;
    font-size: .85rem;
  }
  
  .filter-btn {
    min-height: 44px; /* Apple's minimum touch target */
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .pub-btn {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

/* ---- Info Footer Note (Updated for Touch Support) ---- */
.bg-info {
  position: fixed;
  bottom: 24px;
  left: 24px;
  z-index: 1000;
}

.bg-info-trigger {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(var(--accent-rgb), 0.1);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  color: var(--accent);
  cursor: help;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  /* Make it more touch-friendly */
  min-width: 44px;
  min-height: 44px;
  -webkit-tap-highlight-color: transparent;
}

/* Remove hover effects on touch devices */
@media (hover: hover) {
  .bg-info-trigger:hover {
    background: rgba(var(--accent-rgb), 0.15);
    border-color: var(--accent);
    transform: scale(1.1);
  }
  
  .bg-info-trigger:hover .bg-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateY(-4px);
  }
}

/* Active/pressed state for touch devices */
.bg-info-trigger:active {
  transform: scale(0.95);
  background: rgba(var(--accent-rgb), 0.2);
}

.bg-tooltip {
  position: absolute;
  bottom: 110%;
  left: 0;
  width: 280px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: var(--shadow-sm);
  font-size: 0.7rem;
  line-height: 1.4;
  color: var(--muted);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  pointer-events: none;
  backdrop-filter: blur(12px);
  max-width: calc(100vw - 48px);
  z-index: 1001;
}

.bg-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 16px;
  transform: translateX(0);
  border: 6px solid transparent;
  border-top-color: var(--card);
}

/* Touch-friendly adjustments for mobile */
@media (max-width: 768px) {
  .bg-info {
    bottom: 20px;
    left: 20px;
  }
  
  .bg-info-trigger {
    /* Larger touch target for mobile */
    width: 40px;
    height: 40px;
    min-width: 48px;
    min-height: 48px;
  }
  
  .bg-tooltip {
    width: 240px;
    font-size: 0.65rem;
    bottom: 120%;
    max-width: calc(100vw - 40px);
  }
  
  .bg-tooltip::after {
    left: 14px;
  }
}

@media (max-width: 480px) {
  .bg-info {
    bottom: 16px;
    left: 16px;
  }
  
  .bg-tooltip {
    width: 200px;
    font-size: 0.6rem;
    padding: 10px 12px;
    max-width: calc(100vw - 32px);
  }
  
  .bg-tooltip::after {
    left: 12px;
  }
}

/* ---- Text Selection Prevention ---- */
/* Prevent selection on interactive and decorative elements */
.navbar,
.nav-links,
.nav-brand,
.btn,
.ghost-btn,
.filter-btn,
.pub-btn,
.collapse-toggle,
.back-to-top,
.bg-info-trigger,
.education-item,
.experience-item,
.publication-item,
.skill-category,
.award-item {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  -webkit-touch-callout: none; /* Prevent iOS callout */
}

/* Ensure readable content remains selectable */
.main-title,
.subtitle,
.courses,
.thesis,
.awards,
.experience-item ul li,
.award-item p,
.pub-abstract p,
.bg-tooltip,
code,
pre {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

/* Prevent drag on images and icons */
img,
i[class*="fa"] {
  -webkit-user-drag: none;
  -moz-user-drag: none;
  -ms-user-drag: none;
  user-drag: none;
  pointer-events: none;
}

/* Mobile-specific improvements */
@media (hover: none) and (pointer: coarse) {
  body {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
  }
}