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

:root {
  --bg: #0a0d16;
  --bg-2: #0f1220;
  --bg-card: #131729;
  --border: rgba(255,255,255,0.07);
  --accent: #6c63ff;
  --accent-2: #a78bfa;
  --accent-3: #38bdf8;
  --text: #e2e8f0;
  --text-muted: #7c8ea6;
  --text-dim: #4a5568;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── NAV ── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2.5rem;
  height: 64px;
  background: rgba(10,13,22,0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
#navbar.scrolled { background: rgba(10,13,22,0.95); }

.nav-logo {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links { display: flex; align-items: center; gap: 0.25rem; }

.nav-link {
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--text); background: rgba(255,255,255,0.06); }
.nav-cta {
  background: var(--accent);
  color: #fff !important;
  margin-left: 0.5rem;
}
.nav-cta:hover { background: var(--accent-2); opacity:1; }

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

/* ── MOBILE MENU ── */
.mobile-menu {
  display: none; position: fixed; inset: 64px 0 0 0; z-index: 99;
  background: var(--bg-2);
  flex-direction: column; align-items: center; justify-content: center; gap: 1.5rem;
  opacity: 0; transform: translateY(-10px);
  transition: opacity var(--transition), transform var(--transition);
}
.mobile-menu.open { display: flex; opacity: 1; transform: translateY(0); }
.mobile-link { font-size: 1.25rem; font-weight: 600; color: var(--text-muted); }
.mobile-link:hover { color: var(--text); }

/* ── HERO ── */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  padding: 6rem 2rem 4rem;
}

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

.orb {
  position: absolute; border-radius: 50%;
  filter: blur(80px); opacity: 0.15;
}
.orb-1 { width: 600px; height: 600px; background: var(--accent); top: -10%; left: -15%; animation: pulse 8s ease-in-out infinite; }
.orb-2 { width: 500px; height: 500px; background: var(--accent-3); bottom: -5%; right: -10%; animation: pulse 10s ease-in-out infinite 2s; }
.orb-3 { width: 350px; height: 350px; background: var(--accent-2); top: 40%; left: 45%; animation: pulse 12s ease-in-out infinite 4s; }

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.15; }
  50% { transform: scale(1.15); opacity: 0.22; }
}

.grid-overlay {
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}

.hero-content {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: 5rem;
  max-width: 1100px; width: 100%;
}

.hero-photo-wrap {
  position: relative; flex-shrink: 0;
  width: 280px; height: 280px;
}
.hero-photo-ring {
  position: absolute; inset: -4px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  animation: spin-slow 8s linear infinite;
}
@keyframes spin-slow { to { transform: rotate(360deg); } }

.hero-photo {
  position: absolute; inset: 4px;
  border-radius: 50%;
  object-fit: cover;
  width: calc(100% - 8px); height: calc(100% - 8px);
  background: var(--bg-card);
}

.hero-greeting {
  font-size: 1rem; font-weight: 500;
  color: var(--accent-2); letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.hero-name {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}
.accent { background: linear-gradient(135deg, var(--accent), var(--accent-3)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

.hero-tagline {
  font-size: 1rem; font-weight: 500;
  color: var(--accent-3); margin-bottom: 1rem;
  letter-spacing: 0.02em;
}

.hero-sub {
  font-size: 0.975rem; color: var(--text-muted);
  max-width: 540px; margin-bottom: 2rem;
}

.hero-actions { display: flex; gap: 1rem; margin-bottom: 2rem; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.6rem; border-radius: 50px;
  font-weight: 600; font-size: 0.9rem;
  cursor: pointer; transition: var(--transition);
  border: 2px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-2); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(108,99,255,0.4); }
.btn-outline { border-color: var(--border); color: var(--text-muted); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

.hero-socials { display: flex; gap: 1rem; }
.social-icon {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--bg-card); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  transition: var(--transition);
}
.social-icon svg { width: 18px; height: 18px; }
.social-icon:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-3px); }

.scroll-down {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center;
}
.scroll-down-arrow {
  width: 28px; height: 28px; border-right: 2px solid var(--accent); border-bottom: 2px solid var(--accent);
  transform: rotate(45deg); animation: bounce 2s ease-in-out infinite;
  border-radius: 2px;
}
@keyframes bounce { 0%,100%{transform:rotate(45deg) translateY(0)} 50%{transform:rotate(45deg) translateY(6px)} }

/* ── SECTIONS ── */
.section { padding: 6rem 2rem; }
.section-dark { background: var(--bg-2); }
.container { max-width: 1100px; margin: 0 auto; }

.section-label {
  display: inline-block;
  font-size: 0.75rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); background: rgba(108,99,255,0.12);
  padding: 0.3rem 0.9rem; border-radius: 50px;
  margin-bottom: 0.75rem;
}
.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.8rem, 3.5vw, 2.75rem);
  font-weight: 700; margin-bottom: 3rem;
}

/* ── ABOUT ── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: start; }
.about-bio p { color: var(--text-muted); margin-bottom: 1.2rem; }
.about-bio strong { color: var(--text); }

.skills-section { margin-top: 2rem; }
.skills-section h3 { font-size: 1rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-muted); }
.skill-groups { display: flex; flex-direction: column; gap: 1rem; }
.skill-group { display: flex; flex-direction: column; gap: 0.5rem; }
.skill-label { font-size: 0.75rem; font-weight: 600; color: var(--accent-2); text-transform: uppercase; letter-spacing: 0.08em; }
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tag {
  font-size: 0.78rem; font-weight: 500;
  padding: 0.25rem 0.75rem; border-radius: 50px;
  background: rgba(255,255,255,0.06); border: 1px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition);
}
.tag:hover { border-color: var(--accent); color: var(--accent); }

.about-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.stat-number {
  font-family: 'Outfit', sans-serif;
  font-size: 2.75rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-3));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  line-height: 1;
}
.stat-number span { font-size: 1.5rem; }
.stat-desc { font-size: 0.82rem; color: var(--text-muted); margin-top: 0.5rem; line-height: 1.4; }
.stat-desc small { color: var(--text-dim); display: block; }

/* ── TIMELINE ── */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(to bottom, var(--accent), transparent);
}
.timeline-item { position: relative; padding-bottom: 2.5rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute; left: -2.4rem; top: 0.35rem;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg-2);
  box-shadow: 0 0 12px var(--accent);
}
.timeline-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.75rem 2rem;
  transition: var(--transition);
}
.timeline-card:hover { border-color: var(--accent); }
.timeline-meta { font-size: 0.8rem; color: var(--accent-3); font-weight: 500; margin-bottom: 0.4rem; }
.timeline-card h3 { font-family: 'Outfit', sans-serif; font-size: 1.2rem; font-weight: 700; margin-bottom: 0.25rem; }
.timeline-institution { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 0.25rem; }
.timeline-gpa { font-size: 0.8rem; color: var(--accent-2); font-weight: 500; margin-bottom: 0.75rem; }
.timeline-bullets { display: flex; flex-direction: column; gap: 0.35rem; }
.timeline-bullets li { font-size: 0.875rem; color: var(--text-muted); padding-left: 1rem; position: relative; }
.timeline-bullets li::before { content: '→'; position: absolute; left: 0; color: var(--accent); }

/* ── EXPERIENCE ── */
.exp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.exp-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
  transition: var(--transition);
}
.exp-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: var(--shadow); }
.exp-header { display: flex; align-items: center; gap: 1.25rem; margin-bottom: 1.25rem; }
.exp-icon {
  width: 52px; height: 52px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 0.75rem; letter-spacing: 0.05em; flex-shrink: 0;
}
.exp-icon-rbc { background: linear-gradient(135deg, #003168, #005baa); color: #fff; }
.exp-icon-ciena { background: linear-gradient(135deg, #00a4e4, #0071c1); color: #fff; }
.exp-card h3 { font-family: 'Outfit', sans-serif; font-size: 1.1rem; font-weight: 700; margin-bottom: 0.2rem; }
.exp-meta { font-size: 0.8rem; color: var(--text-muted); }
.exp-bullets { display: flex; flex-direction: column; gap: 0.5rem; }
.exp-bullets li { font-size: 0.875rem; color: var(--text-muted); padding-left: 1rem; position: relative; }
.exp-bullets li::before { content: '▸'; position: absolute; left: 0; color: var(--accent); }
.exp-bullets strong { color: var(--text); }

/* ── PROJECTS ── */
.projects-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.project-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem;
  transition: var(--transition); position: relative; overflow: hidden;
}
.project-card::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(108,99,255,0.05), transparent);
  opacity: 0; transition: opacity var(--transition);
}
.project-card:hover::before { opacity: 1; }
.project-card:hover { border-color: var(--accent); transform: translateY(-5px); box-shadow: var(--shadow); }
.project-card.featured { grid-column: span 2; border-color: rgba(108,99,255,0.3); background: linear-gradient(135deg, var(--bg-card), rgba(108,99,255,0.08)); }
.project-tag { font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent-3); margin-bottom: 0.75rem; }
.project-card h3 { font-family: 'Outfit', sans-serif; font-size: 1.15rem; font-weight: 700; margin-bottom: 0.75rem; }
.project-card p { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 1.25rem; line-height: 1.6; }
.project-stack { display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* ── PUBLICATIONS ── */
.pub-list { display: flex; flex-direction: column; gap: 1rem; }
.pub-item {
  display: flex; gap: 1.5rem; align-items: flex-start;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem 2rem;
  transition: var(--transition);
}
.pub-item:hover { border-color: var(--accent); }
.pub-number {
  font-family: 'Outfit', sans-serif; font-size: 1.5rem; font-weight: 800;
  color: var(--accent); opacity: 0.5; flex-shrink: 0; min-width: 2rem;
}
.pub-title { font-weight: 600; margin-bottom: 0.3rem; font-size: 0.95rem; }
.pub-authors { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.2rem; }
.pub-venue { font-size: 0.82rem; color: var(--accent-3); font-weight: 500; }

/* ── CV ── */
.cv-grid { display: flex; justify-content: center; }
.cv-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 3rem;
  text-align: center; max-width: 400px; width: 100%;
  transition: var(--transition);
}
.cv-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.cv-icon { width: 64px; height: 64px; margin: 0 auto 1.25rem; color: var(--accent); }
.cv-icon svg { width: 100%; height: 100%; }
.cv-card h3 { font-family: 'Outfit', sans-serif; font-size: 1.3rem; font-weight: 700; margin-bottom: 0.75rem; }
.cv-card p { font-size: 0.875rem; color: var(--text-muted); margin-bottom: 1.75rem; }

/* ── CONTACT ── */
.contact-container { text-align: center; }
.contact-intro { color: var(--text-muted); max-width: 540px; margin: 0 auto 3rem; }
.contact-methods { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; max-width: 740px; margin: 0 auto; }
.contact-card {
  display: flex; align-items: center; gap: 1.25rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  text-align: left; transition: var(--transition);
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.contact-icon { width: 44px; height: 44px; flex-shrink: 0; color: var(--accent); }
.contact-icon svg { width: 100%; height: 100%; }
.contact-label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 0.2rem; }
.contact-value { font-size: 0.85rem; font-weight: 500; word-break: break-all; }

/* ── FOOTER ── */
.footer {
  background: var(--bg-2); border-top: 1px solid var(--border);
  padding: 2rem;
}
.footer-inner {
  display: flex; align-items: center; justify-content: center; gap: 0.75rem;
  font-size: 0.85rem; color: var(--text-dim);
}
.footer-sep { color: var(--accent); }

/* ── REVEAL ANIMATIONS ── */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .hero-content { flex-direction: column; text-align: center; gap: 2.5rem; }
  .hero-text { display: flex; flex-direction: column; align-items: center; }
  .hero-photo-wrap { width: 200px; height: 200px; }
  .about-grid { grid-template-columns: 1fr; }
  .exp-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .project-card.featured { grid-column: span 1; }
  .contact-methods { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hamburger { display: flex; }
}
@media (max-width: 600px) {
  .section { padding: 4rem 1.25rem; }
  .about-stats { grid-template-columns: 1fr 1fr; }
}