*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0a0f;
  --bg2: #111118;
  --card: #16161f;
  --border: #2a2a3a;
  --accent: #6c63ff;
  --accent2: #a78bfa;
  --text: #e2e2f0;
  --muted: #8888aa;
  --gold: #f59e0b;
  --silver: #94a3b8;
  --bronze: #cd7c3a;
}

html { scroll-behavior: smooth; }

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

/* ── NAV ── */
nav {
  position: fixed; top: 0; width: 100%; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 5%;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  font-size: 1.4rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: .9rem; transition: color .2s; }
.nav-links a:hover { color: var(--accent2); }
.hamburger { display: none; cursor: pointer; font-size: 1.3rem; color: var(--text); }

/* ── SECTIONS ── */
section { padding: 6rem 10%; }
section:nth-child(even) { background: var(--bg2); }

.section-title {
  font-size: 2rem; font-weight: 700; margin-bottom: 3rem;
  position: relative; display: inline-block;
}
.section-title::after {
  content: ''; position: absolute; bottom: -8px; left: 0;
  width: 50px; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 2px;
}

/* ── HERO ── */
#hero {
  min-height: 100vh; display: flex; align-items: center;
  justify-content: space-between; gap: 3rem; padding-top: 5rem;
}
.hero-greeting { color: var(--accent2); font-size: 1.1rem; margin-bottom: .3rem; }
.hero-content h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 700; line-height: 1.1; }
.typewriter {
  font-size: clamp(1.2rem, 2.5vw, 1.8rem); font-weight: 400;
  color: var(--accent2); margin: .5rem 0 1rem;
}
.hero-desc { color: var(--muted); max-width: 500px; margin-bottom: 2rem; }
.hero-btns { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 2rem; }
.btn {
  padding: .75rem 1.8rem; border-radius: 8px; font-weight: 600;
  text-decoration: none; font-size: .95rem; transition: all .25s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(108,99,255,.4); }
.btn-outline {
  border: 1.5px solid var(--accent); color: var(--accent);
}
.btn-outline:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }
.hero-socials { display: flex; gap: 1.2rem; }
.hero-socials a {
  color: var(--muted); font-size: 1.4rem; transition: color .2s, transform .2s;
}
.hero-socials a:hover { color: var(--accent2); transform: translateY(-3px); }

/* Avatar */
.hero-visual { flex-shrink: 0; }
.avatar-ring {
  width: 260px; height: 260px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  padding: 4px;
}
.avatar-photo {
  width: 100%; height: 100%; border-radius: 50%;
  object-fit: cover; object-position: top;
  display: block;
}
.avatar-inner {
  width: 100%; height: 100%; border-radius: 50%;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  font-size: 4rem; font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ── ABOUT ── */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: start; }
.about-text p { color: var(--muted); margin-bottom: 1rem; }
.about-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-top: 2rem; }
.stat {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1rem; text-align: center;
}
.stat span { font-size: 1.8rem; font-weight: 700; color: var(--accent2); }
.stat p { font-size: .8rem; color: var(--muted); margin-top: .2rem; }
.about-edu h3 { font-size: 1.2rem; margin-bottom: 1rem; color: var(--accent2); }
.edu-card {
  display: flex; gap: 1rem; align-items: flex-start;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.5rem;
}
.edu-icon { font-size: 1.5rem; color: var(--accent); margin-top: .2rem; }
.edu-card h4 { font-size: 1rem; margin-bottom: .3rem; }
.edu-card p { color: var(--muted); font-size: .9rem; }
.edu-card span { font-size: .8rem; color: var(--accent2); }

/* ── 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), var(--accent2));
}
.timeline-item { position: relative; margin-bottom: 2.5rem; }
.timeline-dot {
  position: absolute; left: -2.45rem; top: 1.2rem;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg);
  box-shadow: 0 0 10px var(--accent);
}
.timeline-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1.5rem;
  transition: border-color .2s, transform .2s;
}
.timeline-card:hover { border-color: var(--accent); transform: translateX(4px); }
.timeline-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: .5rem; flex-wrap: wrap; gap: .5rem; }
.timeline-header h3 { font-size: 1.1rem; }
.badge {
  background: rgba(108,99,255,.15); color: var(--accent2);
  padding: .25rem .75rem; border-radius: 20px; font-size: .8rem;
}
.company { color: var(--muted); font-size: .9rem; margin-bottom: .8rem; }
.company i { margin-right: .4rem; }
.timeline-card ul { padding-left: 1.2rem; color: var(--muted); font-size: .9rem; }
.timeline-card ul li { margin-bottom: .4rem; }

/* ── PROJECTS ── */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.5rem; }
.project-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.8rem;
  transition: border-color .2s, transform .2s;
}
.project-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.project-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.project-icon { font-size: 1.8rem; color: var(--accent2); }
.project-links a { color: var(--muted); font-size: 1.2rem; transition: color .2s; }
.project-links a:hover { color: var(--accent2); }
.project-card h3 { font-size: 1.1rem; margin-bottom: .6rem; }
.project-card p { color: var(--muted); font-size: .88rem; margin-bottom: 1rem; }
.tech-tags { display: flex; flex-wrap: wrap; gap: .4rem; }
.tech-tags span {
  background: rgba(108,99,255,.12); color: var(--accent2);
  padding: .2rem .6rem; border-radius: 6px; font-size: .78rem;
}

/* ── PUBLICATIONS ── */
.pub-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.5rem; }
.pub-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.8rem; position: relative;
  transition: border-color .2s, transform .2s;
}
.pub-card:hover { border-color: var(--accent); transform: translateY(-4px); }
.pub-badge {
  display: inline-block; background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff; padding: .2rem .7rem; border-radius: 6px;
  font-size: .75rem; font-weight: 700; margin-bottom: 1rem;
}
.pub-card h3 { font-size: 1rem; margin-bottom: .6rem; }
.pub-card p { color: var(--muted); font-size: .88rem; margin-bottom: 1rem; }
.pub-date { color: var(--muted); font-size: .82rem; display: block; margin-bottom: .8rem; }
.pub-date i { margin-right: .3rem; }
.pub-link {
  color: var(--accent2); text-decoration: none; font-size: .88rem; font-weight: 500;
  transition: color .2s;
}
.pub-link:hover { color: var(--accent); }
.pub-link i { margin-left: .3rem; font-size: .75rem; }

/* ── ACHIEVEMENTS ── */
.achievements-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.2rem; }
.ach-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.5rem; text-align: center;
  transition: transform .2s, border-color .2s;
}
.ach-card:hover { transform: translateY(-4px); }
.ach-rank { font-size: .85rem; font-weight: 600; margin-bottom: .6rem; }
.ach-card h3 { font-size: 1rem; margin-bottom: .4rem; }
.ach-card p { color: var(--muted); font-size: .82rem; }
.gold { border-color: var(--gold); }
.gold .ach-rank { color: var(--gold); }
.silver { border-color: var(--silver); }
.silver .ach-rank { color: var(--silver); }
.bronze { border-color: var(--bronze); }
.bronze .ach-rank { color: var(--bronze); }
.consolation { border-color: var(--accent); }
.consolation .ach-rank { color: var(--accent2); }

/* ── SKILLS ── */
.skills-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.skill-group {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.5rem;
}
.skill-group h3 { font-size: 1rem; margin-bottom: 1rem; color: var(--accent2); }
.skill-group h3 i { margin-right: .5rem; }
.skill-tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.skill-tags span {
  background: rgba(167,139,250,.1); color: var(--text);
  border: 1px solid var(--border);
  padding: .3rem .8rem; border-radius: 8px; font-size: .85rem;
  transition: background .2s, border-color .2s;
}
.skill-tags span:hover { background: rgba(108,99,255,.2); border-color: var(--accent); }

/* ── CONTACT ── */
#contact { text-align: center; }
.contact-sub { color: var(--muted); margin-bottom: 2.5rem; }
.contact-cards { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; }
.contact-card {
  display: flex; align-items: center; gap: .8rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 1rem 1.5rem;
  text-decoration: none; color: var(--text);
  transition: border-color .2s, transform .2s;
}
.contact-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.contact-card i { font-size: 1.2rem; color: var(--accent2); }
.contact-card span { font-size: .9rem; }

/* ── FOOTER ── */
footer {
  text-align: center; padding: 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: .85rem;
}
footer strong { color: var(--accent2); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  section { padding: 4rem 6%; }
  #hero { flex-direction: column; text-align: center; padding-top: 6rem; }
  .hero-btns, .hero-socials { justify-content: center; }
  .hero-desc { margin: 0 auto 2rem; }
  .about-grid { grid-template-columns: 1fr; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: var(--bg2); padding: 1rem 5%; border-bottom: 1px solid var(--border); }
  .nav-links.open { display: flex; }
  .hamburger { display: block; }
  .avatar-ring { width: 180px; height: 180px; }
  .about-stats { grid-template-columns: repeat(2, 1fr); }
  .timeline { padding-left: 1.2rem; }
  .timeline-dot { left: -1.65rem; }
}

/* ── CERT BUTTONS ── */
.cert-links { display: flex; gap: .6rem; flex-wrap: wrap; margin-top: 1rem; }
.cert-btn {
  display: inline-flex; align-items: center; gap: .4rem;
  background: rgba(108,99,255,.12); color: var(--accent2);
  border: 1px solid rgba(108,99,255,.3);
  padding: .35rem .9rem; border-radius: 8px; font-size: .82rem;
  text-decoration: none; font-weight: 500;
  transition: background .2s, border-color .2s, transform .2s;
}
.cert-btn:hover { background: rgba(108,99,255,.25); border-color: var(--accent); transform: translateY(-2px); }
.cert-btn-alt { background: rgba(167,139,250,.1); color: var(--accent2); border-color: rgba(167,139,250,.3); }
.cert-btn-sm { margin-top: .8rem; font-size: .78rem; padding: .28rem .7rem; }

/* ── LOR ── */
#lor { background: var(--bg2); }
.lor-sub { color: var(--muted); margin-bottom: 2rem; }
.lor-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 1.2rem; }
.lor-card {
  display: flex; align-items: center; gap: 1.2rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 1.5rem;
  transition: border-color .2s, transform .2s;
}
.lor-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.lor-icon { font-size: 2rem; color: var(--accent2); flex-shrink: 0; }
.lor-info { flex: 1; }
.lor-info h3 { font-size: 1rem; margin-bottom: .3rem; }
.lor-info p { color: var(--muted); font-size: .85rem; }