/* ═══════════════════════════════════════════════
   RONIK DEDHIA PORTFOLIO — STYLES
   ═══════════════════════════════════════════════ */

/* ── Reset & Tokens ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg:          #07070f;
  --bg-alt:      #090912;
  --card:        rgba(255,255,255,0.03);
  --card-border: rgba(255,255,255,0.07);
  --card-hover:  rgba(255,255,255,0.055);
  --primary:     #818cf8;
  --cyan:        #22d3ee;
  --accent:      #a78bfa;
  --text:        #f1f5f9;
  --text-muted:  #c4d1e1;
  --text-subtle: #475569;
  --grad:        linear-gradient(135deg,#818cf8 0%,#22d3ee 100%);
  --grad-text:   linear-gradient(135deg,#a5b4fc 0%,#67e8f9 100%);
  --glow:        0 0 48px rgba(129,140,248,.12);
  --r:           16px;
  --r-sm:        10px;
  --ease:        cubic-bezier(.4,0,.2,1);
  --t:           .3s;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter',-apple-system,BlinkMacSystemFont,sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: rgba(129,140,248,.22); color: var(--text); }

h1,h2,h3,h4 { font-weight: 700; line-height: 1.2; letter-spacing: -.02em; }

h2 {
  font-size: clamp(2rem,4vw,3rem);
  background: var(--grad-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

a { text-decoration: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.section { padding: 110px 0; }
.section-alt { background: var(--bg-alt); }
.section-header { margin-bottom: 64px; }

.section-tag {
  display: inline-flex;
  align-items: center;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(129,140,248,.08);
  border: 1px solid rgba(129,140,248,.18);
  padding: 5px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}

/* ═══ NAVIGATION ═══ */
#navbar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 24px 0;
  transition: padding var(--t) var(--ease), background var(--t) var(--ease);
}

#navbar.scrolled {
  background: rgba(7,7,15,.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--card-border);
  padding: 14px 0;
}

.nav-container {
  max-width: 1200px; margin: 0 auto; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-size: .9rem; font-weight: 700; letter-spacing: -.02em; white-space: nowrap;
  background: var(--grad); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}

.nav-links { list-style: none; display: flex; align-items: center; gap: 36px; }

.nav-links a {
  color: var(--text-muted); font-size: .875rem; font-weight: 500;
  transition: color var(--t) var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--primary); }

.nav-cta {
  padding: 8px 20px !important; background: var(--grad) !important;
  color: white !important; border-radius: 100px; font-weight: 600 !important;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease) !important;
}
.nav-cta:hover, .nav-cta.active { opacity: .88; transform: translateY(-1px); color: white !important; }

.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.menu-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text); border-radius: 2px; transition: var(--t) var(--ease);
}

/* ═══ HERO ═══ */
#hero {
  min-height: 100vh; display: flex; flex-direction: column;
  justify-content: center; position: relative; overflow: hidden;
  padding: 140px 32px 80px;
}

.hero-bg { position: absolute; inset: 0; pointer-events: none; z-index: 0; }

.orb { position: absolute; border-radius: 50%; filter: blur(80px); }
.orb-1 {
  width: 700px; height: 700px;
  background: radial-gradient(circle,rgba(129,140,248,.13) 0%,transparent 65%);
  top: -250px; right: -200px;
  animation: orbFloat 10s ease-in-out infinite;
}
.orb-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle,rgba(34,211,238,.09) 0%,transparent 65%);
  bottom: -150px; left: -100px;
  animation: orbFloat 12s ease-in-out infinite reverse;
}
.orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle,rgba(167,139,250,.07) 0%,transparent 65%);
  top: 40%; left: 40%;
  animation: orbFloat 8s ease-in-out infinite 2s;
}

@keyframes orbFloat {
  0%,100% { transform: translate(0,0) scale(1); }
  33%      { transform: translate(20px,-30px) scale(1.04); }
  66%      { transform: translate(-15px,15px) scale(.96); }
}

.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.018) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.018) 1px,transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 85% 85% at 50% 50%,black 30%,transparent 100%);
}

.hero-content {
  max-width: 1200px; margin: 0 auto; width: 100%; position: relative; z-index: 1;
}

.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: .78rem; font-weight: 500; color: var(--cyan);
  background: rgba(34,211,238,.07); border: 1px solid rgba(34,211,238,.18);
  padding: 6px 16px; border-radius: 100px; margin-bottom: 36px;
}

.badge-dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--cyan);
  animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
  0%,100% { opacity:1; transform:scale(1); box-shadow:0 0 0 0 rgba(34,211,238,.4); }
  50%      { opacity:.7; transform:scale(.85); box-shadow:0 0 0 6px rgba(34,211,238,0); }
}

.hero-name {
  font-size: clamp(4.5rem,11vw,10rem);
  font-weight: 900; line-height: .92; letter-spacing: -.04em;
  background: var(--grad-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 28px;
}

.hero-role {
  font-size: clamp(1.1rem,2.5vw,1.45rem);
  color: var(--text-muted); margin-bottom: 24px; font-weight: 400; min-height: 2em;
}

.typewriter { color: var(--primary); font-weight: 600; }
.cursor { color: var(--primary); font-weight: 300; animation: blink 1s step-end infinite; }

@keyframes blink { 0%,100% { opacity:1; } 50% { opacity:0; } }

.hero-bio {
  max-width: 580px; color: var(--text-muted); font-size: 1.02rem;
  line-height: 1.75; margin-bottom: 44px;
}
.hero-bio strong { color: var(--text); font-weight: 600; }

/* ── Buttons ── */
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 44px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 100px; font-size: .92rem;
  font-weight: 600; text-decoration: none; border: none; cursor: pointer;
  font-family: inherit; letter-spacing: -.01em;
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease),
              opacity var(--t) var(--ease), background var(--t) var(--ease), border-color var(--t) var(--ease);
}

.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 4px 24px rgba(129,140,248,.28);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(129,140,248,.42); }

.btn-secondary {
  background: rgba(129,140,248,.1); color: var(--primary);
  border: 1px solid rgba(129,140,248,.28);
}
.btn-secondary:hover {
  background: rgba(129,140,248,.17); border-color: rgba(129,140,248,.48);
  transform: translateY(-2px);
}

.btn-ghost {
  background: var(--card); color: var(--primary); border: 1px solid rgba(129,140,248,.3);
}
.btn-ghost:hover {
  background: rgba(129,140,248,.07); border-color: rgba(129,140,248,.55);
  transform: translateY(-2px);
}

.btn-lg { padding: 16px 44px; font-size: 1rem; }

.hero-links { display: flex; gap: 28px; align-items: center; }

.social-link {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--text-subtle); font-size: .85rem; font-weight: 500;
  transition: color var(--t) var(--ease), transform var(--t) var(--ease);
}
.social-link:hover { color: var(--primary); transform: translateY(-1px); }


/* ═══ EXPERTISE STRIP ═══ */
.expertise-strip {
  background: var(--bg-alt);
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
  padding: 64px 0;
}

.expertise-grid {
  display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; align-items: stretch;
}

.expertise-card {
  padding: 32px; border-radius: var(--r);
  border: 1px solid var(--card-border); background: var(--card);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), background var(--t) var(--ease);
  position: relative; overflow: hidden;
}

.expertise-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: var(--grad); opacity: .28;
  transition: opacity .4s var(--ease);
}
.expertise-card:hover::before { opacity: 1; }

.expertise-card:hover {
  border-color: rgba(129,140,248,.2); transform: translateY(-4px);
  background: var(--card-hover); box-shadow: var(--glow);
}

.expertise-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: rgba(129,140,248,.1); border: 1px solid rgba(129,140,248,.18);
  display: flex; align-items: center; justify-content: center;
  color: var(--primary); margin-bottom: 20px;
}

.expertise-label {
  font-size: .68rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--cyan); background: rgba(34,211,238,.08); border: 1px solid rgba(34,211,238,.2);
  padding: 2px 10px; border-radius: 100px; display: inline-block; margin-bottom: 10px;
}
.expertise-card h3 { font-size: 1.05rem; color: var(--text); margin-bottom: 10px; }

.expertise-bullets {
  list-style: none; padding: 0; margin: 0 0 16px; display: flex; flex-direction: column; gap: 6px;
}
.expertise-bullets li {
  font-size: .82rem; color: var(--text-muted); padding-left: 14px; position: relative;
}
.expertise-bullets li::before {
  content: '→'; position: absolute; left: 0; color: var(--primary); font-size: .72rem;
}

.expertise-tech {
  font-size: .72rem; color: var(--text-subtle);
  font-family: 'JetBrains Mono',monospace; line-height: 1.6;
}

/* ── Section ambient glows — pulls hero atmosphere through the page ── */
#about      { background-image: radial-gradient(ellipse 55% 55% at 92% 8%,  rgba(129,140,248,.055) 0%, transparent 100%); }
#projects   { background: radial-gradient(ellipse 50% 60% at 8%  90%, rgba(34,211,238,.04)   0%, transparent 100%) var(--bg-alt); }
#experience { background-image: radial-gradient(ellipse 55% 55% at 88% 55%, rgba(167,139,250,.045) 0%, transparent 100%); }
#education  { background: radial-gradient(ellipse 50% 50% at 10% 15%, rgba(129,140,248,.045) 0%, transparent 100%) var(--bg-alt); }
#publications { background: radial-gradient(ellipse 55% 55% at 85% 25%, rgba(34,211,238,.035) 0%, transparent 100%) var(--bg-alt); }
#contact    { background-image: radial-gradient(ellipse 60% 60% at 50% 80%, rgba(129,140,248,.05)  0%, transparent 100%); }

/* ═══ ABOUT ═══ */
.about-grid {
  display: grid; grid-template-columns: 240px 1fr 1fr; gap: 48px; align-items: start;
}

/* Photo col */
.about-photo-col { display: flex; flex-direction: column; gap: 20px; align-items: center; }

.profile-photo-wrap {
  position: relative; width: 200px; height: 200px;
}

.profile-img {
  width: 100%; height: 100%; object-fit: cover;
  border-radius: 20px; border: 1px solid var(--card-border);
  display: block;
}

.profile-avatar-lg {
  width: 200px; height: 200px; border-radius: 20px;
  background: var(--grad);
  display: flex; align-items: center; justify-content: center;
  font-size: 3.5rem; font-weight: 900; color: white;
  letter-spacing: -.06em;
  box-shadow: 0 8px 40px rgba(129,140,248,.25);
}

.photo-glow {
  position: absolute; inset: -16px;
  background: radial-gradient(circle, rgba(129,140,248,.12), transparent 70%);
  pointer-events: none; z-index: -1;
}

.profile-quick-facts {
  width: 100%; display: flex; flex-direction: column; gap: 8px;
}

.pqf-row {
  display: flex; align-items: center; gap: 8px;
  font-size: .78rem; color: var(--text-muted); font-weight: 500;
}
.pqf-row svg { color: var(--primary); flex-shrink: 0; }

/* Bio text */
.about-text p { color: var(--text-muted); line-height: 1.82; margin-bottom: 20px; font-size: .97rem; }
.about-text p:last-child { margin-bottom: 0; }
.about-text strong { color: var(--text); font-weight: 600; }

/* Highlights */
.about-highlights { display: flex; flex-direction: column; gap: 14px; }

.highlight-card {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 18px 20px; background: var(--card);
  border: 1px solid var(--card-border); border-radius: var(--r-sm);
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), background var(--t) var(--ease);
}
.highlight-card:hover {
  border-color: rgba(129,140,248,.2); background: var(--card-hover); transform: translateY(-3px); box-shadow: var(--glow);
}
.highlight-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }
.highlight-card strong { display: block; font-size: .88rem; font-weight: 600; color: var(--text); margin-bottom: 3px; }
.highlight-card span { font-size: .78rem; color: var(--text-muted); line-height: 1.5; }

/* ═══ EXPERIENCE ═══ */
.experience-card {
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: var(--r); padding: 44px;
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
  position: relative; overflow: hidden;
}
.experience-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--grad);
}
.experience-card:hover { border-color: rgba(129,140,248,.18); box-shadow: var(--glow); }

.exp-header {
  display: flex; justify-content: space-between; align-items: flex-start;
  margin-bottom: 36px; flex-wrap: wrap; gap: 20px;
}
.exp-company { display: flex; align-items: center; gap: 18px; }

.company-logo {
  width: 52px; height: 52px; background: var(--grad); border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: .9rem; color: #fff; letter-spacing: -.06em;
  flex-shrink: 0; box-shadow: 0 4px 16px rgba(129,140,248,.28);
}

.exp-company h3 { font-size: 1.15rem; color: var(--text); font-weight: 700; margin-bottom: 4px; }
.exp-role { font-size: .82rem; color: var(--primary); font-weight: 600; }
.exp-meta { text-align: right; }
.exp-date { display: block; font-size: .84rem; color: var(--text-muted); font-weight: 500; margin-bottom: 4px; }
.exp-location { font-size: .78rem; color: var(--text-subtle); }

.exp-metrics {
  display: grid; grid-template-columns: repeat(4,1fr); gap: 16px;
  margin-bottom: 36px; padding: 22px;
  background: rgba(129,140,248,.04); border: 1px solid rgba(129,140,248,.1); border-radius: var(--r-sm);
}
.metric { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 4px; }
.metric-val {
  font-size: 1.5rem; font-weight: 800; letter-spacing: -.04em;
  background: var(--grad-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.metric-desc { font-size: .7rem; color: var(--text-subtle); font-weight: 500; line-height: 1.3; }

.exp-bullets { list-style: none; margin-bottom: 28px; display: flex; flex-direction: column; }
.exp-bullets li {
  color: var(--text-muted); padding: 12px 0 12px 22px; position: relative;
  border-bottom: 1px solid var(--card-border); font-size: .9rem; line-height: 1.65;
}
.exp-bullets li:last-child { border-bottom: none; }
.exp-bullets li::before { content: '→'; position: absolute; left: 0; color: var(--primary); font-size: .8rem; top: 13px; }
.exp-bullets strong { color: var(--text); font-weight: 600; }

.exp-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.exp-tags span {
  font-size: .72rem; color: var(--primary);
  background: rgba(129,140,248,.07); border: 1px solid rgba(129,140,248,.14);
  padding: 4px 12px; border-radius: 100px; font-weight: 500;
  font-family: 'JetBrains Mono',monospace;
}

/* ═══ EDUCATION ═══ */
.education-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }

.edu-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--r);
  padding: 36px; display: flex; flex-direction: column; gap: 20px;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), box-shadow var(--t) var(--ease);
  position: relative; overflow: hidden;
}
.edu-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad); opacity: .3;
  transition: opacity .4s var(--ease);
}
.edu-card:hover::before { opacity: 1; }
.edu-card:hover { border-color: rgba(129,140,248,.22); transform: translateY(-4px); box-shadow: var(--glow); }

.edu-top { display: flex; align-items: flex-start; gap: 16px; }

.edu-logo {
  width: 48px; height: 48px; flex-shrink: 0;
  background: var(--grad); border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: .85rem; color: #fff; letter-spacing: -.05em;
  box-shadow: 0 4px 16px rgba(129,140,248,.25);
}

.edu-info { flex: 1; }
.edu-info h3 { font-size: .96rem; color: var(--text); font-weight: 700; line-height: 1.35; margin-bottom: 4px; }
.edu-university { font-size: .76rem; color: var(--text-subtle); font-weight: 500; }

.edu-year {
  font-size: .7rem; font-weight: 700; color: var(--cyan);
  background: rgba(34,211,238,.08); border: 1px solid rgba(34,211,238,.2);
  padding: 3px 10px; border-radius: 100px; white-space: nowrap; height: fit-content;
}

.edu-degree { font-size: .88rem; color: var(--primary); font-weight: 600; }

.edu-stats {
  display: flex; align-items: center; gap: 0;
  background: rgba(129,140,248,.04); border: 1px solid rgba(129,140,248,.1);
  border-radius: var(--r-sm); overflow: hidden;
}
.edu-stat { flex: 1; display: flex; flex-direction: column; align-items: center; padding: 14px 12px; gap: 2px; }
.edu-stat-val {
  font-size: 1.05rem; font-weight: 800; letter-spacing: -.02em;
  background: var(--grad-text); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.edu-stat-label { font-size: .65rem; color: var(--text-subtle); font-weight: 500; }
.edu-stat-div { width: 1px; height: 32px; background: var(--card-border); }

.edu-note { font-size: .78rem; color: var(--text-subtle); font-style: italic; }

/* ═══ PROJECTS ═══ */
.project-filters {
  display: flex; gap: 8px; margin-bottom: 32px; flex-wrap: wrap;
}

.filter-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 18px; border-radius: 100px; font-size: .82rem; font-weight: 600;
  background: var(--card); border: 1px solid var(--card-border); color: var(--text-muted);
  cursor: pointer; font-family: inherit;
  transition: all var(--t) var(--ease);
}
.filter-btn:hover { border-color: rgba(129,140,248,.25); color: var(--text); background: var(--card-hover); }
.filter-btn.active { background: rgba(129,140,248,.1); border-color: rgba(129,140,248,.3); color: var(--primary); }

.filter-count {
  font-size: .7rem; background: rgba(129,140,248,.15); padding: 1px 6px;
  border-radius: 100px; font-weight: 700;
}
.filter-btn.active .filter-count { background: rgba(129,140,248,.25); }

.projects-grid { display: grid; grid-template-columns: repeat(12,1fr); gap: 20px; margin-bottom: 44px; }
.projects-grid.filtered { grid-template-columns: repeat(auto-fill,minmax(340px,1fr)); }

.project-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--r);
  padding: 30px; display: flex; flex-direction: column; gap: 14px;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease),
              box-shadow var(--t) var(--ease), background var(--t) var(--ease);
}
.project-card:hover {
  background: var(--card-hover); border-color: rgba(129,140,248,.22);
  transform: translateY(-5px); box-shadow: var(--glow);
}
.project-card.featured { grid-column: span 6; }
.project-card:not(.featured) { grid-column: span 4; }
.projects-grid.filtered .project-card,
.projects-grid.filtered .project-card.featured { grid-column: span 1; }

.project-header { display: flex; justify-content: space-between; align-items: flex-start; }

/* Monogram badge replacing emojis */
.proj-monogram {
  width: 40px; height: 40px; border-radius: 10px; background: var(--grad);
  display: flex; align-items: center; justify-content: center;
  font-size: .78rem; font-weight: 900; color: #fff; letter-spacing: -.04em;
  box-shadow: 0 2px 12px rgba(129,140,248,.22);
  flex-shrink: 0;
}

.proj-actions { display: flex; align-items: center; gap: 10px; }

.proj-demo {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: .72rem; font-weight: 600; color: var(--cyan);
  background: rgba(34,211,238,.07); border: 1px solid rgba(34,211,238,.2);
  padding: 4px 10px; border-radius: 100px;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease), transform var(--t) var(--ease);
}
.proj-demo:hover {
  background: rgba(34,211,238,.14); border-color: rgba(34,211,238,.38);
  transform: translateY(-1px);
}

.project-github {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--text-subtle); font-size: .76rem; font-weight: 500;
  transition: color var(--t) var(--ease);
}
.project-github:hover { color: var(--primary); }

.project-card h3 { font-size: 1.08rem; color: var(--text); font-weight: 700; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.project-badge {
  font-size: .62rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em;
  color: var(--cyan); background: rgba(34,211,238,.08);
  border: 1px solid rgba(34,211,238,.2); padding: 2px 8px; border-radius: 100px;
}

.project-card p { color: var(--text-muted); font-size: .875rem; line-height: 1.65; flex: 1; }

.project-features { display: flex; flex-wrap: wrap; gap: 6px; }
.project-features span {
  font-size: .68rem; font-weight: 600; color: var(--primary);
  background: rgba(129,140,248,.07); border: 1px solid rgba(129,140,248,.18);
  padding: 3px 10px; border-radius: 100px;
}

.project-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.project-tags span {
  font-size: .68rem; color: var(--primary); background: rgba(129,140,248,.1);
  border: 1px solid rgba(129,140,248,.3); padding: 3px 9px; border-radius: 100px;
  font-family: 'JetBrains Mono',monospace;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.project-card:hover .project-tags span { background: rgba(129,140,248,.18); border-color: rgba(129,140,248,.5); }

.projects-cta { text-align: center; }

/* ═══ TECH MARQUEE ═══ */
.marquee-section {
  padding: 48px 0; overflow: hidden;
  background: var(--bg); border-top: 1px solid var(--card-border); border-bottom: 1px solid var(--card-border);
}

.marquee-label {
  text-align: center; font-size: .7rem; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase; color: var(--text-subtle);
  margin-bottom: 28px;
}

.marquee-track { display: flex; flex-direction: column; gap: 12px; }

.marquee-row { overflow: hidden; position: relative; }
.marquee-row::before, .marquee-row::after {
  content: ''; position: absolute; top: 0; bottom: 0; width: 120px; z-index: 2; pointer-events: none;
}
.marquee-row::before { left: 0; background: linear-gradient(to right,var(--bg),transparent); }
.marquee-row::after  { right: 0; background: linear-gradient(to left,var(--bg),transparent); }

.marquee-inner { display: flex; gap: 10px; width: max-content; }

.scroll-left  { animation: mLeft  30s linear infinite; }
.scroll-right { animation: mRight 30s linear infinite; }

@keyframes mLeft  { from { transform: translateX(0); }    to { transform: translateX(-50%); } }
@keyframes mRight { from { transform: translateX(-50%); } to { transform: translateX(0); }    }

.marquee-track:hover .marquee-inner { animation-play-state: paused; }

.marquee-inner span {
  display: inline-block; padding: 7px 16px; border-radius: 100px;
  font-size: .8rem; font-weight: 500; white-space: nowrap;
  color: var(--text-muted); background: var(--card); border: 1px solid var(--card-border);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.marquee-inner span:hover {
  color: var(--primary); border-color: rgba(129,140,248,.25);
  background: rgba(129,140,248,.07);
}

/* ═══ PUBLICATIONS ═══ */
.publications-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }

.pub-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--r);
  padding: 36px; display: flex; flex-direction: column; gap: 18px;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), box-shadow var(--t) var(--ease);
  position: relative; overflow: hidden;
}
.pub-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--grad); opacity: .3;
  transition: opacity .4s var(--ease);
}
.pub-card:hover::before { opacity: 1; }
.pub-card:hover { border-color: rgba(129,140,248,.22); transform: translateY(-5px); box-shadow: var(--glow); }

.pub-badge {
  display: inline-block; font-size: .68rem; font-weight: 800; letter-spacing: .12em;
  text-transform: uppercase; padding: 4px 12px; border-radius: 100px; width: fit-content;
}
.pub-badge.ieee  { color: #60a5fa; background: rgba(96,165,250,.08); border: 1px solid rgba(96,165,250,.2); }
.pub-badge.ijsr  { color: var(--cyan); background: rgba(34,211,238,.08); border: 1px solid rgba(34,211,238,.2); }

.pub-card h3 { font-size: 1.02rem; color: var(--text); font-weight: 700; line-height: 1.45; }
.pub-card p  { color: var(--text-muted); font-size: .875rem; line-height: 1.65; flex: 1; }

.pub-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.pub-meta span { font-size: .68rem; color: var(--text-subtle); background: rgba(255,255,255,.03); border: 1px solid var(--card-border); padding: 3px 10px; border-radius: 100px; }

.pub-link { display: inline-flex; align-items: center; gap: 6px; color: var(--primary); font-size: .84rem; font-weight: 600; transition: color var(--t) var(--ease), gap var(--t) var(--ease); }
.pub-link:hover { color: var(--accent); gap: 10px; }

/* ═══ CONTACT ═══ */
.contact-wrapper { max-width: 600px; margin: 0 auto; text-align: center; }
.contact-wrapper h2 { margin: 14px 0 20px; }
.contact-wrapper > p { color: var(--text-muted); font-size: 1rem; line-height: 1.75; margin-bottom: 52px; }

.contact-links { display: flex; flex-direction: column; gap: 12px; margin-bottom: 40px; text-align: left; }

.contact-card {
  display: flex; align-items: center; gap: 18px; padding: 18px 24px;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: var(--r-sm); color: var(--text-muted); font-size: .88rem;
  transition: border-color var(--t) var(--ease), transform var(--t) var(--ease), background var(--t) var(--ease);
}
.contact-card:hover {
  border-color: rgba(129,140,248,.22); background: var(--card-hover);
  transform: translateX(6px); color: var(--text);
}

.contact-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; color: #fff;
}
.contact-icon.email   { background: linear-gradient(135deg,#818cf8,#a78bfa); }
.contact-icon.phone   { background: linear-gradient(135deg,#22d3ee,#06b6d4); }
.contact-icon.github  { background: linear-gradient(135deg,#818cf8,#a78bfa); }
.contact-icon.linkedin{ background: linear-gradient(135deg,#0ea5e9,#0284c7); }

.contact-label { display: block; font-size: .7rem; font-weight: 600; text-transform: uppercase; letter-spacing: .08em; color: var(--text-subtle); margin-bottom: 2px; }
.contact-val { display: block; font-size: .9rem; color: var(--text-muted); font-weight: 500; transition: color var(--t) var(--ease); }
.contact-card:hover .contact-val { color: var(--text); }

.contact-arrow { margin-left: auto; color: var(--text-subtle); flex-shrink: 0; transition: transform var(--t) var(--ease), color var(--t) var(--ease); }
.contact-card:hover .contact-arrow { transform: translateX(4px); color: var(--primary); }

.contact-bottom-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ═══ FOOTER ═══ */
footer { padding: 40px 0; border-top: 1px solid var(--card-border); text-align: center; }
footer p { color: var(--text-subtle); font-size: .82rem; margin-top: 12px; }
footer strong { color: var(--text-muted); font-weight: 600; }
.footer-social { display: flex; justify-content: center; gap: 20px; margin-bottom: 4px; }
.footer-social a { color: var(--text-subtle); transition: color var(--t) var(--ease); }
.footer-social a:hover { color: var(--primary); }
.footer-sub { margin-top: 6px; font-size: .75rem; }

/* ═══ BACK TO TOP ═══ */
.back-to-top {
  position: fixed; bottom: 28px; right: 28px; z-index: 99;
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--grad); color: #fff; border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 20px rgba(129,140,248,.35);
  opacity: 0; transform: translateY(12px) scale(.9);
  transition: opacity .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
  pointer-events: none;
}
.back-to-top.visible { opacity: 1; transform: translateY(0) scale(1); pointer-events: auto; }
.back-to-top:hover { box-shadow: 0 8px 28px rgba(129,140,248,.5); transform: translateY(-2px) scale(1.05); }

/* ═══ REVEAL ANIMATIONS ═══ */
.reveal {
  opacity: 0; transform: translateY(28px);
  transition: opacity .65s var(--ease), transform .65s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

.expertise-grid .reveal:nth-child(1) { transition-delay: 0ms; }
.expertise-grid .reveal:nth-child(2) { transition-delay: 80ms; }
.expertise-grid .reveal:nth-child(3) { transition-delay: 160ms; }

.projects-grid .reveal:nth-child(1) { transition-delay: 0ms; }
.projects-grid .reveal:nth-child(2) { transition-delay: 80ms; }
.projects-grid .reveal:nth-child(3) { transition-delay: 40ms; }
.projects-grid .reveal:nth-child(4) { transition-delay: 80ms; }
.projects-grid .reveal:nth-child(5) { transition-delay: 120ms; }

.education-grid .reveal:nth-child(1) { transition-delay: 0ms; }
.education-grid .reveal:nth-child(2) { transition-delay: 120ms; }

/* ═══ RESPONSIVE ═══ */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .about-photo-col { grid-column: span 2; flex-direction: row; align-items: flex-start; gap: 32px; }
  .profile-photo-wrap { flex-shrink: 0; }
  .expertise-grid { grid-template-columns: repeat(3,1fr); }
  .projects-grid { grid-template-columns: repeat(2,1fr); }
  .project-card.featured, .project-card:not(.featured) { grid-column: span 1; }
  .exp-metrics { grid-template-columns: repeat(2,1fr); }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .section { padding: 80px 0; }
  #hero { padding: 120px 20px 60px; }

  .nav-links { display: none; }
  .menu-toggle { display: flex; }

  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: rgba(7,7,15,.97); backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--card-border); padding: 24px 28px; gap: 22px;
  }
  .nav-links.open li { list-style: none; }
  .nav-links.open .nav-cta { display: inline-block; width: fit-content; }

  .about-grid { grid-template-columns: 1fr; gap: 32px; }
  .about-photo-col { grid-column: span 1; flex-direction: column; align-items: center; }
  .expertise-grid { grid-template-columns: 1fr; }
  .education-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .publications-grid { grid-template-columns: 1fr; }

  .hero-stats { flex-wrap: wrap; border-radius: var(--r-sm); }
  .stat { flex: 1 0 50%; }
  .stat:nth-child(2), .stat:nth-child(4) { border-left: 1px solid var(--card-border); }
  .stat:nth-child(3), .stat:nth-child(4) { border-top: 1px solid var(--card-border); }
  .stat-divider { display: none; }

  .exp-metrics { grid-template-columns: repeat(2,1fr); }
  .exp-header { flex-direction: column; }
  .exp-meta { text-align: left; }
  .experience-card { padding: 28px 24px; }

  .contact-bottom-cta { flex-direction: column; align-items: center; }
}

@media (max-width: 540px) {
  .hero-name { font-size: clamp(3.5rem,16vw,5rem); }
  .hero-actions { flex-direction: column; align-items: flex-start; }
  .contact-wrapper { max-width: 100%; }
  .filter-btn .filter-count { display: none; }
  .cf-row { grid-template-columns: 1fr; }
}

/* ═══ READING PROGRESS BAR ═══ */
.progress-bar {
  position: fixed; top: 0; left: 0; z-index: 200;
  height: 2px; width: 0%;
  background: var(--grad);
  transition: width .08s linear;
  pointer-events: none;
}

/* ═══ CUSTOM CURSOR (desktop only) ═══ */
@media (pointer: fine) {
  body, a, button, [role="button"],
  .project-card, .filter-btn, .expertise-card,
  .highlight-card, .contact-card { cursor: none; }
}

.cursor-dot {
  position: fixed; z-index: 9999; pointer-events: none;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--primary);
  transform: translate(-50%,-50%);
  transition: width .2s var(--ease), height .2s var(--ease), background .2s var(--ease), opacity .3s;
  will-change: left, top;
  opacity: 0;
}

.cursor-ring {
  position: fixed; z-index: 9998; pointer-events: none;
  width: 28px; height: 28px; border-radius: 50%;
  border: 1.5px solid rgba(129,140,248,.55);
  transform: translate(-50%,-50%);
  transition: width .22s var(--ease), height .22s var(--ease),
              border-color .22s var(--ease), background .22s var(--ease), opacity .3s;
  will-change: left, top;
  opacity: 0;
}

.cursor-dot.active { opacity: 1; }
.cursor-ring.active { opacity: 1; }

.cursor-dot.hovering { width: 9px; height: 9px; background: var(--cyan); }
.cursor-ring.hovering {
  width: 46px; height: 46px;
  border-color: rgba(34,211,238,.35);
  background: rgba(34,211,238,.04);
}

/* ═══ BROWSER PREVIEW ═══ */
.proj-preview {
  border-radius: 8px; overflow: hidden;
  border: 1px solid var(--card-border);
  transition: border-color var(--t) var(--ease);
  flex-shrink: 0;
}
.project-card:hover .proj-preview { border-color: rgba(129,140,248,.2); }

.browser-bar {
  display: flex; align-items: center; gap: 10px;
  padding: 7px 12px;
  background: rgba(255,255,255,.03);
  border-bottom: 1px solid var(--card-border);
}

.browser-dots { display: flex; gap: 5px; flex-shrink: 0; }
.browser-dots span { width: 7px; height: 7px; border-radius: 50%; }
.browser-dots span:nth-child(1) { background: rgba(255,95,87,.55); }
.browser-dots span:nth-child(2) { background: rgba(255,189,46,.55); }
.browser-dots span:nth-child(3) { background: rgba(40,201,64,.55); }

.browser-url {
  flex: 1; text-align: center;
  font-size: .62rem; color: var(--text-subtle);
  font-family: 'JetBrains Mono', monospace;
  background: rgba(255,255,255,.04);
  border: 1px solid var(--card-border);
  border-radius: 100px; padding: 3px 12px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.browser-body { height: 130px; overflow: hidden; position: relative; }

.browser-body img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
  display: block;
  transition: transform .5s var(--ease);
}
.project-card:hover .browser-body img { transform: translateY(-6px); }

/* Skeleton placeholder */
.browser-placeholder {
  height: 100%; padding: 12px;
  background: linear-gradient(155deg, rgba(129,140,248,.05), rgba(34,211,238,.03));
  display: flex; flex-direction: column; gap: 9px;
}

.bp-topbar { display: flex; gap: 7px; }
.bp-pill {
  height: 9px; border-radius: 5px;
  background: rgba(255,255,255,.07); flex: 1;
  animation: bpPulse 2s ease-in-out infinite;
}
.bp-pill.short { max-width: 36%; animation-delay: .35s; }

.bp-cards { display: flex; gap: 7px; }
.bp-card {
  flex: 1; height: 46px; border-radius: 6px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.05);
  animation: bpPulse 2s ease-in-out infinite;
}
.bp-card:nth-child(2) { animation-delay: .2s; }
.bp-card:nth-child(3) { animation-delay: .4s; }

.bp-lines { display: flex; flex-direction: column; gap: 6px; }
.bp-line {
  height: 5px; border-radius: 3px;
  background: rgba(255,255,255,.06);
  animation: bpPulse 2s ease-in-out infinite;
}
.bp-line.short { width: 58%; animation-delay: .25s; }

@keyframes bpPulse {
  0%,100% { opacity: .4; }
  50%      { opacity: .85; }
}

/* ═══ CONTACT FORM ═══ */
.contact-form {
  width: 100%; display: flex; flex-direction: column;
  gap: 16px; margin-bottom: 32px; text-align: left;
}

.cf-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.cf-group { display: flex; flex-direction: column; gap: 7px; }

.cf-group label {
  font-size: .7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .09em; color: var(--text-subtle);
}

.cf-group input,
.cf-group textarea {
  background: rgba(255,255,255,.03);
  border: 1px solid var(--card-border);
  border-radius: var(--r-sm);
  padding: 12px 16px;
  color: var(--text); font-size: .9rem;
  font-family: 'Inter', sans-serif;
  outline: none; resize: none; width: 100%;
  transition: border-color var(--t) var(--ease),
              background var(--t) var(--ease),
              box-shadow var(--t) var(--ease);
}

.cf-group input::placeholder,
.cf-group textarea::placeholder { color: var(--text-subtle); }

.cf-group input:focus,
.cf-group textarea:focus {
  border-color: rgba(129,140,248,.45);
  background: rgba(129,140,248,.04);
  box-shadow: 0 0 0 3px rgba(129,140,248,.08);
}

.cf-submit { width: 100%; justify-content: center; }

.cf-submit:disabled { opacity: .6; cursor: not-allowed; transform: none; }