/* ============ Reset & tokens ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #08080a;
  --bg-soft: #0c0c10;
  --text: #f4f4f5;
  --text-dim: #9a9aa5;
  --text-dimmer: #6b6b76;
  --accent: #3b82f6;
  --accent-2: #22d3ee;
  --border: rgba(255,255,255,0.07);
  --border-strong: rgba(255,255,255,0.14);
  --glass: rgba(255,255,255,0.03);
  --glass-hover: rgba(255,255,255,0.05);
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-display: 'Bricolage Grotesque', var(--font-sans);
  --font-mono: 'JetBrains Mono', monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input { font: inherit; color: inherit; background: none; border: none; }

::selection { background: rgba(59,130,246,0.35); color: #fff; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

:focus-visible {
  outline: 2px solid rgba(59,130,246,0.75);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; top: -100px; left: 1rem; z-index: 200;
  background: #fff; color: #000; padding: 0.6rem 1rem;
  border-radius: 8px; font-size: 0.85rem; font-weight: 600;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 1rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ Layout helpers ============ */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.container-narrow { max-width: 760px; }
.section { position: relative; padding: 7rem 0; }
.center { text-align: center; }

.kicker {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono); font-size: 0.72rem;
  text-transform: uppercase; letter-spacing: 0.2em;
  color: var(--accent-2); margin-bottom: 1.25rem;
}
.dot-signal, .kicker::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 3px rgba(34,211,238,0.14);
}
.eyebrow { display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.2em; color: var(--text-dimmer); margin-bottom: 2rem;
}

.section-head { max-width: 640px; margin: 0 auto 4rem; text-align: center; }
.section-title {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(2.1rem, 1.6vw + 1.4rem, 3.2rem);
  letter-spacing: -0.025em; line-height: 1.08; margin-bottom: 1rem;
}
.section-sub { color: var(--text-dim); font-size: 1.05rem; line-height: 1.6; }
.list-label {
  font-family: var(--font-mono); font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.2em; color: var(--text-dimmer); margin: 2.5rem 0 1.5rem;
}

/* ============ Glass ============ */
.glass {
  background: var(--glass);
  border: 1px solid var(--border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 1.1rem;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
a.glass:hover, button.glass:hover, .glass.hoverable:hover {
  background: var(--glass-hover);
  border-color: var(--border-strong);
  transform: translateY(-4px);
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.85rem 1.7rem; border-radius: 0.7rem;
  font-size: 0.92rem; font-weight: 500;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
  will-change: transform;
}
.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 10px 30px -12px rgba(59,130,246,0.5);
}
.btn-primary:hover { background: #4f8ef7; transform: translateY(-2px); }
.btn-outline {
  border: 1px solid rgba(255,255,255,0.16); color: var(--text);
}
.btn-outline:hover { background: rgba(255,255,255,0.05); border-color: rgba(255,255,255,0.28); transform: translateY(-2px); }

/* ============ Nav ============ */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 2px; width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 100; transition: width 0.1s linear;
}
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 90;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(8,8,10,0.75);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-color: var(--border);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 1.5rem;
  height: 4.5rem; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; }
.nav-links { display: flex; gap: 0.2rem; }
.nav-link {
  padding: 0.5rem 0.9rem; border-radius: 0.5rem; font-size: 0.88rem;
  color: var(--text-dim); transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.nav-link:hover { color: var(--text); }
.nav-link.active-link { color: var(--text); background: rgba(255,255,255,0.06); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 0.4rem; }
.nav-toggle span { width: 20px; height: 2px; background: var(--text); transition: transform 0.3s var(--ease), opacity 0.3s var(--ease); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-nav {
  display: none; flex-direction: column; padding: 0.5rem 1.5rem 1.25rem;
  background: rgba(8,8,10,0.96); border-bottom: 1px solid var(--border);
  max-height: 0; overflow: hidden; transition: max-height 0.35s var(--ease);
}
.mobile-nav.open { max-height: 420px; }
.mobile-nav .nav-link { padding: 0.8rem 0.5rem; border-bottom: 1px solid var(--border); }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav { display: flex; }
}

/* ============ Hero ============ */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center; justify-content: center;
  padding: 7rem 1.5rem 4rem; text-align: center; overflow: hidden;
}
.hero-field { position: absolute; inset: 0; pointer-events: none; }
#fieldCanvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.55; }
.hero-glow {
  position: absolute; top: -20%; left: 50%; transform: translateX(-50%);
  width: 900px; height: 700px; border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,0.16) 0%, transparent 65%);
  animation: drift 22s ease-in-out infinite;
}
@keyframes drift {
  0%, 100% { transform: translateX(-50%) translateY(0) scale(1); }
  50% { transform: translateX(-50%) translateY(3%) scale(1.06); }
}
.dot-grid {
  position: absolute; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-mask-image: radial-gradient(ellipse 60% 55% at 50% 15%, black, transparent);
  mask-image: radial-gradient(ellipse 60% 55% at 50% 15%, black, transparent);
}

.hero-content { position: relative; z-index: 2; max-width: 780px; }
.hero-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(3rem, 6vw + 1rem, 6.5rem);
  line-height: 0.98; letter-spacing: -0.03em; margin-bottom: 1.1rem;
}
.hero-type {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.4rem, 1.6vw + 1rem, 2.2rem);
  color: var(--text-dim); margin-bottom: 1.75rem; min-height: 1.4em;
}
.type-text {
  background: linear-gradient(90deg, #60a5fa, #22d3ee);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.type-cursor {
  display: inline-block; width: 2px; height: 0.9em;
  background: var(--accent); margin-left: 4px; vertical-align: middle;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc { color: var(--text-dim); font-size: 1.12rem; max-width: 560px; margin: 0 auto 2.5rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 3.5rem; }

.hero-stats { display: flex; align-items: center; justify-content: center; gap: 2rem; flex-wrap: wrap; }
.stat-value { font-family: var(--font-display); font-size: 1.7rem; font-weight: 700; line-height: 1; }
.stat-label { font-size: 0.78rem; color: var(--text-dimmer); margin-top: 0.35rem; }
.stat-sep { width: 1px; height: 2rem; background: var(--border); }

.scroll-cue {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  color: var(--text-dimmer); animation: bob 2s ease-in-out infinite;
}
@keyframes bob { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }

/* ============ Reveal-on-scroll ============ */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal[data-dir="left"] { transform: translateX(-32px); }
.reveal[data-dir="right"] { transform: translateX(32px); }
.reveal.in-view { opacity: 1; transform: translate(0,0); }

/* ============ About ============ */
.about-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 3.5rem; align-items: center; margin-bottom: 3.5rem; }
.portrait-frame { padding: 0.75rem; }
.portrait-ph {
  aspect-ratio: 3/4; border-radius: 0.8rem;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-size: 4rem; font-weight: 700;
  color: rgba(255,255,255,0.25);
  background: linear-gradient(160deg, rgba(59,130,246,0.12), rgba(34,211,238,0.05));
}
.pull-quote {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.35rem, 1vw + 1rem, 1.7rem);
  line-height: 1.4; color: var(--text); margin-bottom: 1.25rem;
}
.about-copy p { color: var(--text-dim); margin-bottom: 1rem; }
.about-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.card { padding: 1.75rem; }
.card h3 { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 0.9rem; font-weight: 600; }
.card ul li { color: var(--text); font-size: 0.92rem; padding: 0.3rem 0; position: relative; padding-left: 1rem; }
.card ul li::before { content: ''; position: absolute; left: 0; top: 0.75rem; width: 4px; height: 4px; border-radius: 50%; background: var(--accent); }

@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-cards { grid-template-columns: 1fr; }
}

/* ============ Timeline ============ */
.timeline { position: relative; padding: 2rem 0; }
.timeline-track {
  position: absolute; left: 50%; top: 0; bottom: 0; width: 2px;
  background: var(--border); transform: translateX(-50%);
}
.timeline-fill {
  position: absolute; left: 0; top: 0; width: 100%; height: 0%;
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  transition: height 0.1s linear;
}
.tl-item { position: relative; width: 50%; padding: 1rem 3rem; margin-bottom: 1rem; }
.tl-item:nth-child(odd) { left: 0; }
.tl-item:nth-child(even) { left: 50%; }
.tl-item::before {
  content: ''; position: absolute; top: 2.3rem; width: 12px; height: 12px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--accent);
}
.tl-item:nth-child(odd)::before { right: -6px; }
.tl-item:nth-child(even)::before { left: -6px; }

.tl-card { width: 100%; text-align: left; padding: 1.6rem; cursor: pointer; }
.tl-head { display: flex; align-items: flex-start; gap: 0.9rem; }
.tl-icon {
  flex-shrink: 0; width: 2.4rem; height: 2.4rem; border-radius: 0.7rem;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--c) 15%, transparent);
  color: var(--c); font-size: 1.1rem;
}
.tl-title-row { display: flex; align-items: baseline; gap: 0.6rem; flex-wrap: wrap; }
.tl-title-row h3 { font-size: 1.1rem; font-weight: 600; }
.tl-period { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-dimmer); }
.tl-subtitle { font-size: 0.85rem; color: var(--text-dimmer); margin-top: 0.1rem; }
.chev { margin-left: auto; color: var(--text-dimmer); transition: transform 0.3s var(--ease); flex-shrink: 0; }
.tl-card[aria-expanded="true"] .chev { transform: rotate(180deg); }
.tl-desc {
  color: var(--text-dim); font-size: 0.9rem; line-height: 1.6; margin-top: 0.8rem;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.tl-card[aria-expanded="true"] .tl-desc { -webkit-line-clamp: unset; }
.tl-highlights {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem;
  max-height: 0; opacity: 0; overflow: hidden;
  transition: max-height 0.4s var(--ease), opacity 0.4s var(--ease), margin 0.4s var(--ease);
}
.tl-card[aria-expanded="true"] .tl-highlights { max-height: 200px; opacity: 1; margin-top: 1rem; }
.tl-highlights span { font-size: 0.83rem; color: var(--text-dim); padding-left: 0.9rem; position: relative; }
.tl-highlights span::before { content: ''; position: absolute; left: 0; top: 0.5em; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }

.journey-cta { text-align: center; margin-top: 3rem; padding-top: 3rem; border-top: 1px solid var(--border); }
.journey-cta p { color: var(--text-dimmer); margin-bottom: 1.25rem; }

@media (max-width: 780px) {
  .timeline-track, .timeline-fill { left: 1rem; transform: none; }
  .tl-item, .tl-item:nth-child(even) { width: 100%; left: 0; padding: 1rem 0 1rem 2.5rem; }
  .tl-item::before, .tl-item:nth-child(odd)::before { left: calc(1rem - 6px); }
}

/* ============ Projects ============ */
.project-flagship {
  display: block; position: relative; padding: 2.5rem; margin-bottom: 1.5rem;
  overflow: hidden;
}
.badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--accent); background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.25); border-radius: 999px;
  padding: 0.3rem 0.8rem; margin-bottom: 1rem;
}
.spark { color: var(--accent-2); }
.project-flagship h3, .project-card h3 { font-family: var(--font-display); font-weight: 600; margin-bottom: 0.7rem; }
.project-flagship h3 { font-size: clamp(1.8rem, 1.5vw + 1rem, 2.4rem); }
.project-flagship p { color: var(--text-dim); max-width: 560px; margin-bottom: 1.25rem; }
.tech-row { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.tech-row span { font-size: 0.78rem; padding: 0.3rem 0.7rem; border-radius: 999px; background: rgba(255,255,255,0.03); border: 1px solid var(--border); color: var(--text-dim); }
.link-cta { font-size: 0.88rem; color: var(--text-dimmer); transition: color 0.3s var(--ease); }
.project-flagship:hover .link-cta, .project-card:hover .link-cta { color: var(--accent); }

.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.project-card { display: block; padding: 1.75rem; }
.tech-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); margin-bottom: 1rem; }
.project-card h3 { font-size: 1.2rem; }
.project-card p { color: var(--text-dim); font-size: 0.92rem; margin-bottom: 1.1rem; }

@media (max-width: 860px) { .projects-grid { grid-template-columns: 1fr; } }

/* ============ Chitti flagship section ============ */
.chitti-section { position: relative; border-top: 1px solid var(--border); overflow: hidden; }
.chitti-glow {
  position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 700px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, rgba(59,130,246,0.14), transparent 70%);
  filter: blur(40px); pointer-events: none;
}
.chitti-title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.5rem, 4vw + 1rem, 4.5rem);
  letter-spacing: -0.03em; margin-bottom: 1.25rem; position: relative;
}
.chitti-desc { color: var(--text-dim); font-size: 1.1rem; max-width: 640px; margin-bottom: 3rem; position: relative; }
.chitti-body { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; position: relative; }
.chitti-body .card:nth-child(4), .chitti-body .card:nth-child(5) { grid-column: 1 / -1; }
.chitti-body h3 { font-size: 1.1rem; color: var(--text); margin-bottom: 0.75rem; }
.chitti-body p { color: var(--text-dim); font-size: 0.94rem; }

.phase-list { display: flex; flex-direction: column; gap: 1.1rem; }
.phase { display: flex; align-items: flex-start; gap: 0.9rem; }
.phase-dot { flex-shrink: 0; width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--accent); background: var(--bg); margin-top: 0.2rem; }
.phase-current { background: var(--accent-2); border-color: var(--accent-2); }
.phase b { font-family: var(--font-mono); font-size: 0.78rem; color: var(--accent); display: block; margin-bottom: 0.15rem; }
.phase p { font-size: 0.9rem; }

.lessons li { position: relative; padding-left: 1.1rem; margin-bottom: 0.6rem; color: var(--text-dim); font-size: 0.94rem; }
.lessons li::before { content: ''; position: absolute; left: 0; top: 0.6em; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }

@media (max-width: 860px) {
  .chitti-body { grid-template-columns: 1fr; }
  .chitti-body .card:nth-child(4), .chitti-body .card:nth-child(5) { grid-column: 1; }
}

/* ============ Research ============ */
.research-list { border-top: 1px solid var(--border); }
.research-row {
  display: flex; gap: 2rem; padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
}
.tag {
  flex-shrink: 0; width: 100px; font-family: var(--font-mono);
  font-size: 0.72rem; color: var(--text-dimmer); padding-top: 0.15rem;
}
.tag::before { content: ''; display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); margin-right: 0.5rem; }
.tag-mono::before { display: none; }
.research-row b { display: block; font-family: var(--font-display); font-weight: 600; margin-bottom: 0.35rem; }
.research-row p { color: var(--text-dim); font-size: 0.92rem; max-width: 560px; }

@media (max-width: 640px) { .research-row { flex-direction: column; gap: 0.4rem; } .tag { width: auto; } }

/* ============ Hero avatar ============ */
.hero-avatar { position: relative; display: inline-block; margin-bottom: 1.75rem; }
.hero-avatar-ring {
  width: 108px; height: 108px; border-radius: 50%; padding: 3px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 40px -8px rgba(59,130,246,0.5);
}
.hero-avatar-ring img {
  width: 100%; height: 100%; border-radius: 50%; object-fit: cover;
  border: 3px solid var(--bg);
}
.status-chip {
  position: absolute; bottom: 2px; right: 2px;
  width: 26px; height: 26px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #34d399; animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

/* ============ About portrait image ============ */
.portrait-frame { padding: 0.75rem; }
.portrait-img { width: 100%; aspect-ratio: 3/4; object-fit: cover; border-radius: 0.8rem; }

/* ============ Project thumbnail ============ */
.project-thumb {
  aspect-ratio: 16/10; border-radius: 0.7rem; overflow: hidden;
  margin-bottom: 1.1rem; border: 1px solid var(--border);
}
.project-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.project-card:hover .project-thumb img { transform: scale(1.05); }

/* ============ Gallery ============ */
.gallery-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.9rem;
}
.gallery-item {
  position: relative; border-radius: 0.8rem; overflow: hidden;
  aspect-ratio: 4/3; border: 1px solid var(--border); cursor: pointer;
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease);
}
.gallery-item:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.gallery-item:hover img { transform: scale(1.08); }
.gallery-item::after {
  content: '⤢'; position: absolute; top: 0.5rem; right: 0.5rem;
  width: 26px; height: 26px; border-radius: 50%;
  background: rgba(0,0,0,0.5); color: #fff; font-size: 0.85rem;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.3s var(--ease);
}
.gallery-item:hover::after { opacity: 1; }

@media (max-width: 960px) { .gallery-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 640px) { .gallery-grid { grid-template-columns: repeat(2, 1fr); } }

/* ============ Lightbox ============ */
.lightbox {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(4,4,6,0.94); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity 0.3s var(--ease);
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox-img {
  max-width: min(88vw, 1100px); max-height: 82vh; border-radius: 0.6rem;
  box-shadow: 0 30px 80px -20px rgba(0,0,0,0.6);
}
.lightbox-close, .lightbox-nav {
  position: absolute; color: #fff; background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12); border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.3s var(--ease);
}
.lightbox-close:hover, .lightbox-nav:hover { background: rgba(255,255,255,0.14); }
.lightbox-close { top: 1.5rem; right: 1.5rem; width: 42px; height: 42px; font-size: 1rem; }
.lightbox-nav { top: 50%; transform: translateY(-50%); width: 48px; height: 48px; font-size: 1.6rem; }
.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }
.lightbox-counter {
  position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%);
  font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-dimmer);
}
@media (max-width: 640px) {
  .lightbox-nav { width: 40px; height: 40px; }
  .lightbox-prev { left: 0.5rem; }
  .lightbox-next { right: 0.5rem; }
}

/* ============ Certificates ============ */
.cert-controls { display: flex; flex-direction: column; align-items: center; gap: 1.25rem; margin-bottom: 0.75rem; }
.cert-search {
  display: flex; align-items: center; gap: 0.6rem; width: 100%; max-width: 420px;
  padding: 0.7rem 1rem; border-radius: 0.7rem;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  color: var(--text-dimmer); transition: border-color 0.3s var(--ease);
}
.cert-search:focus-within { border-color: rgba(59,130,246,0.4); }
.cert-search input { flex: 1; color: var(--text); font-size: 0.9rem; }
.cert-search input::placeholder { color: var(--text-dimmer); }

.cert-filters { display: flex; gap: 0.5rem; flex-wrap: wrap; justify-content: center; }
.filter-pill {
  padding: 0.5rem 1rem; border-radius: 999px; font-size: 0.8rem;
  border: 1px solid var(--border); color: var(--text-dim);
  transition: all 0.3s var(--ease);
}
.filter-pill:hover { color: var(--text); border-color: var(--border-strong); }
.filter-pill.active { background: rgba(59,130,246,0.1); border-color: rgba(59,130,246,0.3); color: #93c5fd; }

.cert-count { text-align: center; font-size: 0.85rem; color: var(--text-dimmer); margin: 1.5rem 0; }

.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.cert-card {
  position: relative; overflow: hidden; padding: 1.4rem;
  display: flex; align-items: flex-start; gap: 1rem;
}
.cert-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--cert-color, var(--accent)); opacity: 0.7;
}
.cert-icon {
  flex-shrink: 0; width: 2.75rem; height: 2.75rem; border-radius: 0.7rem;
  display: flex; align-items: center; justify-content: center; font-size: 1.1rem;
  background: color-mix(in srgb, var(--cert-color, var(--accent)) 16%, transparent);
  color: var(--cert-color, var(--accent));
}
.cert-info h4 { font-size: 0.98rem; font-weight: 600; margin-bottom: 0.25rem; }
.cert-info .issuer { font-size: 0.82rem; color: var(--text-dimmer); margin-bottom: 0.6rem; }
.cert-meta { display: flex; align-items: center; gap: 0.6rem; }
.cert-date { font-family: var(--font-mono); font-size: 0.75rem; color: var(--text-dimmer); }
.cert-cat {
  font-size: 0.72rem; padding: 0.15rem 0.55rem; border-radius: 999px;
  color: var(--cert-color, var(--accent));
  border: 1px solid color-mix(in srgb, var(--cert-color, var(--accent)) 30%, transparent);
  background: color-mix(in srgb, var(--cert-color, var(--accent)) 8%, transparent);
}
.cert-empty { text-align: center; color: var(--text-dimmer); padding: 3rem 0; grid-column: 1/-1; }

@media (max-width: 860px) { .cert-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 560px) { .cert-grid { grid-template-columns: 1fr; } }

/* ============ Contact ============ */
.contact-section { padding-bottom: 9rem; }
.email-pill {
  display: inline-flex; align-items: center; gap: 0.75rem;
  padding: 0.9rem 1.5rem; border-radius: 999px; margin: 2.5rem 0 1.75rem;
  color: var(--text);
}
.email-pill svg { color: var(--accent); }
.email-pill #emailText { font-family: var(--font-mono); font-size: 0.9rem; }
.email-pill #copyIcon { color: var(--text-dimmer); font-size: 0.95rem; }
.email-pill.copied #copyIcon { color: #34d399; }

.contact-links { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; margin-bottom: 2.5rem; }
.contact-links a {
  padding: 0.55rem 1.1rem; border-radius: 999px; font-size: 0.88rem;
  border: 1px solid var(--border); color: var(--text-dim);
  transition: all 0.3s var(--ease);
}
.contact-links a:hover { color: var(--text); border-color: var(--border-strong); background: rgba(255,255,255,0.03); }

/* ============ Footer ============ */
.footer { border-top: 1px solid var(--border); padding: 2rem 0; }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; font-size: 0.82rem; color: var(--text-dimmer); }

/* ============ Magnetic button cursor hint ============ */
.magnetic { will-change: transform; }

/* Fine responsive polish */
@media (max-width: 480px) {
  .hero-stats { gap: 1.25rem; }
  .stat-sep { height: 1.6rem; }
  .section { padding: 5rem 0; }
}

/* ---- Certificate image cards ---- */
.cert-img-card {
  padding: 0;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  text-align: left;
  border: none;
  background: none;
  width: 100%;
}
.cert-img-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: rgba(15,23,42,0.6);
}
.cert-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
  display: block;
}
.cert-img-card:hover .cert-img-wrap img,
.cert-img-card:focus .cert-img-wrap img {
  transform: scale(1.04);
}
.cert-img-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10,15,28,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.cert-img-overlay span {
  color: #fff;
  font-family: var(--font-mono, monospace);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  border: 1px solid rgba(255,255,255,0.6);
  padding: 0.35em 0.9em;
  border-radius: 999px;
}
.cert-img-card:hover .cert-img-overlay,
.cert-img-card:focus .cert-img-overlay {
  opacity: 1;
}
.cert-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--cert-color, #3b82f6);
  background: rgba(15,23,42,0.8);
}
.cert-img-card .cert-info {
  padding: 1rem 1.1rem 1.1rem;
}
.cert-img-card .cert-info h4 {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary, #f1f5f9);
  margin: 0 0 0.2rem;
  line-height: 1.3;
}
.cert-img-card .cert-info .issuer {
  font-size: 0.78rem;
  color: var(--text-muted, #94a3b8);
  margin: 0 0 0.5rem;
}
.cert-img-card .cert-meta {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}
.cert-img-card .cert-cat {
  color: var(--cert-color, #3b82f6);
}

/* Lightbox title */
.lightbox-title {
  position: absolute;
  top: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  background: rgba(10,15,28,0.7);
  padding: 0.35em 1em;
  border-radius: 999px;
  white-space: nowrap;
  max-width: 80vw;
  overflow: hidden;
  text-overflow: ellipsis;
  z-index: 2;
  pointer-events: none;
}

/* ---- Flagship card image ---- */
.flagship-img-wrap {
  width: 100%;
  border-radius: 0.75rem 0.75rem 0 0;
  overflow: hidden;
  aspect-ratio: 16/7;
  margin-bottom: 1.5rem;
}
.flagship-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top;
  transition: transform 0.5s ease;
}
.project-flagship:hover .flagship-img-wrap img {
  transform: scale(1.03);
}