/* ===========================
   CSS CUSTOM PROPERTIES
   =========================== */
:root {
  --bg:        #060910;
  --bg2:       #0d1117;
  --surface:   rgba(13,20,33,0.7);
  --border:    rgba(20,184,166,0.15);
  --teal:      #14b8a6;
  --teal-dim:  #0d9488;
  --cyan:      #22d3ee;
  --cyan-dim:  #0891b2;
  --text:      #e2e8f0;
  --muted:     #64748b;
  --white:     #ffffff;
  --font:      'Outfit', sans-serif;
  --mono:      'JetBrains Mono', monospace;
  --radius:    16px;
  --radius-sm: 8px;
  --glow:      0 0 40px rgba(20,184,166,0.18);
  --transition: 0.35s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; font-size: 16px; }

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

#particleCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ===========================
   GRADIENT ORBS
   =========================== */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  animation: orbFloat 12s ease-in-out infinite alternate;
}
.orb-1 { width: 520px; height: 520px; background: rgba(20,184,166,0.12); top: -180px; left: -180px; animation-delay: 0s; }
.orb-2 { width: 400px; height: 400px; background: rgba(34,211,238,0.08); bottom: 10%; right: -150px; animation-delay: -4s; }
.orb-3 { width: 300px; height: 300px; background: rgba(20,184,166,0.07); top: 50%; left: 40%; animation-delay: -8s; }

@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 40px) scale(1.08); }
}

/* ===========================
   UTILITY
   =========================== */
.mono    { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.06em; }
.accent  { color: var(--teal); }

.glass-card {
  background: var(--surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--glow), inset 0 1px 0 rgba(255,255,255,0.04);
}

/* ===========================
   SCROLL ANIMATIONS
   =========================== */
[data-scroll-animate] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.65s var(--transition), transform 0.65s var(--transition);
}
[data-scroll-animate].animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   BUTTONS
   =========================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.6rem;
  border-radius: 50px;
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}
.btn.primary {
  background: linear-gradient(135deg, var(--teal), var(--cyan-dim));
  color: var(--bg);
  box-shadow: 0 4px 20px rgba(20,184,166,0.35);
}
.btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(20,184,166,0.5);
  filter: brightness(1.1);
}
.btn.outline {
  background: transparent;
  color: var(--teal);
  border: 1.5px solid var(--teal);
}
.btn.outline:hover {
  background: rgba(20,184,166,0.1);
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(20,184,166,0.2);
}
.btn.glass {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
}
.btn.glass:hover {
  background: rgba(255,255,255,0.1);
  transform: translateY(-2px);
}
.btn-arrow { transition: transform 0.2s; }
.btn:hover .btn-arrow { transform: translate(3px,-3px); }

/* ===========================
   NAVBAR
   =========================== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 4rem;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.navbar.scrolled {
  background: rgba(6,9,16,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 30px rgba(0,0,0,0.3);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}
.brand-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 10px var(--teal);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { box-shadow: 0 0 8px var(--teal); }
  50%      { box-shadow: 0 0 20px var(--teal), 0 0 40px rgba(20,184,166,0.4); }
}
.brand-text {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--white);
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.2rem;
}
.nav-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: 50px;
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--teal);
  background: rgba(20,184,166,0.1);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
}
.mobile-menu-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}
.mobile-menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===========================
   HERO
   =========================== */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 3rem;
  padding: 8rem 4rem 4rem;
  max-width: 1200px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(20,184,166,0.08);
  border: 1px solid rgba(20,184,166,0.2);
  border-radius: 50px;
  padding: 0.35rem 1rem;
  margin-bottom: 1.8rem;
  color: var(--teal);
}
.eyebrow-dot {
  width: 6px; height: 6px;
  background: var(--teal);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.hero-name {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--white);
  margin-bottom: 2rem;
}
.hero-name span {
  background: linear-gradient(135deg, var(--teal), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-socials {
  display: flex;
  gap: 0.8rem;
}
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  transition: var(--transition);
  text-decoration: none;
}
.social-link svg { width: 20px; height: 20px; fill: var(--muted); transition: fill 0.2s; }
.social-link:hover { background: rgba(20,184,166,0.12); border-color: var(--teal); transform: translateY(-3px); }
.social-link:hover svg { fill: var(--teal); }

/* Hero Right */
.tagline {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 300;
  color: var(--muted);
  line-height: 1.4;
  margin-bottom: 2.4rem;
}
.hero-buttons { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3rem; }

.scroll-hint {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  color: var(--muted);
}
.scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--teal), transparent);
  animation: scrollDrop 2s ease-in-out infinite;
}
@keyframes scrollDrop {
  0%   { transform: scaleY(0); transform-origin: top; }
  50%  { transform: scaleY(1); transform-origin: top; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* ===========================
   SECTION LAYOUT
   =========================== */
.section {
  position: relative;
  z-index: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--teal);
  margin-bottom: 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.label-num { opacity: 0.5; }
.section-heading {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 2.5rem;
  color: var(--white);
}
.card {
  padding: 2.5rem;
}
.card h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--white);
  margin-bottom: 1.2rem;
}

/* ===========================
   ABOUT
   =========================== */
.about-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
}
.about-text-col p {
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.8;
}
.about-stats {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  min-width: 140px;
}
.stat-item {
  text-align: center;
  padding: 1.2rem 1.5rem;
  background: rgba(20,184,166,0.06);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 800;
  color: var(--teal);
  line-height: 1;
}
.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ===========================
   SKILLS
   =========================== */
.skill-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
}
.skill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  border: 1px solid var(--border);
  background: rgba(20,184,166,0.05);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}
.skill-icon { font-size: 1rem; }
.skill-badge:hover {
  border-color: var(--teal);
  background: rgba(20,184,166,0.12);
  color: var(--teal);
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 4px 15px rgba(20,184,166,0.2);
}
.skill-badge.pulse { animation: skillPop 0.45s cubic-bezier(0.36,0.07,0.19,0.97); }
@keyframes skillPop {
  0%,100% { transform: scale(1); }
  30% { transform: scale(1.18) rotate(-2deg); }
  60% { transform: scale(0.95) rotate(1deg); }
}

/* ===========================
   PROJECTS
   =========================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.8rem;
}
.project-card {
  position: relative;
  padding: 2.2rem;
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(24px);
  border: 1px solid var(--border);
  box-shadow: var(--glow);
  transition: var(--transition);
  overflow: hidden;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
  opacity: 0;
  transition: opacity var(--transition);
}
.project-card.accent-cyan::before {
  background: linear-gradient(90deg, var(--cyan), var(--teal));
}
.project-card:hover { transform: translateY(-6px); box-shadow: 0 20px 60px rgba(20,184,166,0.2); }
.project-card:hover::before { opacity: 1; }

.project-num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--teal);
  opacity: 0.6;
  margin-bottom: 0.8rem;
  letter-spacing: 0.1em;
}
.project-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 0.7rem;
}
.project-card p {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.75;
  margin-bottom: 1.4rem;
}
.project-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.6rem; }
.tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.75rem;
  border-radius: 50px;
  background: rgba(20,184,166,0.1);
  color: var(--teal);
  border: 1px solid rgba(20,184,166,0.25);
  font-weight: 500;
}

/* ===========================
   RESEARCH
   =========================== */
.research-container {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-top: 1rem;
}
.research-icon {
  flex-shrink: 0;
  width: 72px; height: 72px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 18px;
  background: rgba(20,184,166,0.1);
  border: 1px solid var(--border);
}
.research-icon svg { width: 34px; height: 34px; color: var(--teal); stroke: var(--teal); }
.research-body h3 { font-size: 1.1rem; font-weight: 700; color: var(--white); margin-bottom: 0.5rem; }
.research-body p { color: var(--muted); font-size: 0.92rem; margin-bottom: 1.2rem; }

/* ===========================
   CERTIFICATES
   =========================== */
.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.4rem;
}
.certificate-card {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.4rem 1.6rem;
  border-radius: var(--radius);
  background: var(--surface);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.certificate-card:hover {
  border-color: var(--teal);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(20,184,166,0.15);
}
.certificate-icon {
  flex-shrink: 0;
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(20,184,166,0.1);
  border-radius: 12px;
}
.certificate-icon svg { width: 22px; height: 22px; stroke: var(--teal); }
.cert-body { flex: 1; min-width: 0; }
.cert-body h3 { font-size: 0.88rem; font-weight: 600; color: var(--white); margin-bottom: 0.2rem; line-height: 1.3; }
.certificate-issuer { font-size: 0.75rem; color: var(--muted); margin-bottom: 0.8rem; }
.certificate-btn { padding: 0.45rem 1rem; font-size: 0.78rem; }

/* ===========================
   FOOTER
   =========================== */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 2rem 4rem;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer p { color: var(--muted); font-size: 0.82rem; }
.footer-tagline {
  color: var(--teal);
  opacity: 0.6;
  font-size: 0.78rem !important;
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 900px) {
  .navbar { padding: 1rem 1.5rem; }
  .hero { grid-template-columns: 1fr; padding: 7rem 1.5rem 3rem; min-height: auto; }
  .hero-right { text-align: left; }
  .about-inner { grid-template-columns: 1fr; }
  .about-stats { flex-direction: row; flex-wrap: wrap; }
  .footer-inner { flex-direction: column; gap: 0.5rem; text-align: center; }
}

@media (max-width: 650px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    background: rgba(6,9,16,0.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1rem;
    gap: 0;
  }
  .nav-links.active { display: flex; }
  .nav-link { padding: 0.75rem 1rem; border-radius: var(--radius-sm); }
  .mobile-menu-toggle { display: flex; }
  .section { padding: 3.5rem 1.2rem; }
  .card { padding: 1.5rem; }
  .hero-name { font-size: 2.8rem; }
  .research-container { flex-direction: column; align-items: flex-start; }
  .projects-grid { grid-template-columns: 1fr; }
  .certificates-grid { grid-template-columns: 1fr; }
}