:root {
  --bg: #0a0e27;
  --surface: rgba(255,255,255,0.03);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --accent: #3b82f6;
  --accent2: #8b5cf6;
  --glass-bg: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.1);
  --shadow: rgba(0,0,0,0.3);
  --font-base: 'Inter', sans-serif;
  --font-display: 'Poppins', sans-serif;
}

body.light-theme {
  --bg: #f8fafc;
  --surface: rgba(0,0,0,0.02);
  --text: #1e293b;
  --text-dim: #64748b;
  --accent: #2563eb;
  --accent2: #7c3aed;
  --glass-bg: rgba(255,255,255,0.7);
  --glass-border: rgba(0,0,0,0.1);
  --shadow: rgba(0,0,0,0.1);
}

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

body {
  font-family: var(--font-base);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.3s, color 0.3s;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* === NAV === */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 999;
  backdrop-filter: blur(12px);
  background: var(--glass-bg);
  border-bottom: 1px solid var(--glass-border);
  transition: all 0.3s;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text);
}

.logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 10px;
}

.accent { color: var(--accent); }

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 0.3s;
  position: relative;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--accent);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}

.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

.mode-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 8px 16px;
  border-radius: 50px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s;
}

.mode-toggle:hover {
  background: var(--surface);
  transform: translateY(-2px);
}

.menu-icon {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text);
}

/* === HERO === */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding-top: 80px;
}

#tsparticles {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
  padding: 40px 20px;
}

.hero-inner h1 {
  font-family: var(--font-display);
  font-size: 4.5rem;
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.1;
}

.hero-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.15rem;
  color: var(--text-dim);
  margin-bottom: 32px;
  line-height: 1.8;
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.typewriter {
  min-height: 32px;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 32px;
  font-weight: 600;
}

.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn {
  padding: 12px 28px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px var(--shadow);
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  border: none;
}

.scroll-indicator {
  font-size: 0.9rem;
  color: var(--text-dim);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-10px); }
  60% { transform: translateY(-5px); }
}

/* === SECTIONS === */
section {
  padding: 100px 20px;
  position: relative;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 16px;
}

.section-sub {
  text-align: center;
  color: var(--text-dim);
  font-size: 1.1rem;
  margin-bottom: 60px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Glass effect */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 32px;
  box-shadow: 0 8px 32px var(--shadow);
  transition: all 0.3s;
}

.glass:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 48px var(--shadow);
}

/* === ABOUT === */
.about-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 40px;
  align-items: center;
}

.profile {
  position: relative;
}

.profile-img {
  width: 100%;
  border-radius: 20px;
  display: block;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.badge {
  padding: 6px 14px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
}

/* === TIMELINE === */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline .item {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
  padding: 24px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  transition: all 0.3s;
}

.timeline .item:hover {
  transform: translateX(10px);
  box-shadow: 0 8px 32px var(--shadow);
}

.timeline .item i {
  font-size: 1.8rem;
  color: var(--accent);
  min-width: 40px;
}

.meta {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin: 4px 0 12px;
}

.desc {
  color: var(--text-dim);
  line-height: 1.7;
}

/* === PROJECTS === */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.card {
  perspective: 1000px;
  height: 280px;
  text-decoration: none;
  display: block;
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}

.card:hover .card-inner {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 20px;
  padding: 32px;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-face.front {
  color: var(--text);
}

.card-face.back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.card .meta {
  font-size: 0.9rem;
  opacity: 0.8;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 4px 12px;
  background: rgba(255,255,255,0.1);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* === SKILLS === */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 32px;
}

.skill-category {
  animation: float 6s ease-in-out infinite;
}

.skill-category:nth-child(1) {
  animation-delay: 0s;
}

.skill-category:nth-child(2) {
  animation-delay: 3s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

.skill-category h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--accent);
}

.skill-category ul {
  list-style: none;
}

.skill-category li {
  padding: 8px 0;
  padding-left: 24px;
  position: relative;
  color: var(--text-dim);
}

.skill-category li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: bold;
}

/* === CERTS === */
.certs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.cert {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 24px;
  text-align: center;
  transition: all 0.3s;
}

.cert:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 48px var(--shadow);
}

.cert img {
  max-width: 250px;
  margin-bottom: 20px;
  border-radius: 12px;
}

.cert a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s;
}

.cert a:hover {
  color: var(--accent2);
}

/* === CONTACT === */
.contact-grid-single {
  display: flex;
  justify-content: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-box {
  padding: 40px;
  width: 100%;
}

.contact-box h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.contact-box p {
  margin-bottom: 16px;
}

.socials {
  display: flex;
  gap: 16px;
  margin: 32px 0;
  justify-content: center;
}

.socials a {
  width: 48px;
  height: 48px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  font-size: 1.2rem;
  transition: all 0.3s;
  text-decoration: none;
}

.socials a:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  transform: translateY(-3px);
}

.contact-btn-wrapper {
  margin-top: 32px;
  text-align: center;
}

/* === FOOTER === */
footer {
  padding: 40px 20px;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  color: var(--text-dim);
}

footer p {
  margin: 8px 0;
}

.footer-links {
  font-size: 0.95rem;
}

.footer-links a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color 0.3s;
}

.footer-links a:hover {
  color: var(--accent);
}

/* === EDUCATION === */
.education-content {
  max-width: 900px;
  margin: 0 auto;
}

.education-card {
  padding: 40px;
}

.education-header {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  margin-bottom: 32px;
}

.education-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.education-icon i {
  font-size: 1.8rem;
  color: #fff;
}

.education-info h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: 8px;
  color: var(--text);
}

.institution {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}

.location {
  color: var(--text-dim);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.coursework {
  padding-top: 24px;
  border-top: 1px solid var(--glass-border);
}

.coursework h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 16px;
  color: var(--text);
}

.course-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.course-badge {
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--glass-border);
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dim);
  transition: all 0.3s;
}

.course-badge:hover {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  transform: translateY(-2px);
  border-color: transparent;
}

/* === RESPONSIVE === */
@media (max-width: 992px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    flex-direction: column;
    padding: 20px;
    gap: 20px;
  }

  .nav-links.active {
    display: flex;
  }

  .menu-icon {
    display: block;
  }

  .hero-inner h1 {
    font-size: 3rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .skill-category {
    animation: none;
  }
}

@media (max-width: 768px) {
  .hero-inner h1 {
    font-size: 2.5rem;
  }

  .hero-title {
    font-size: 1.4rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .section-title {
    font-size: 2.2rem;
  }

  .projects {
    grid-template-columns: 1fr;
  }

  .card {
    height: 320px;
  }

  .cert img {
    max-width: 150px;
  }

  .education-header {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .education-info h3 {
    font-size: 1.3rem;
  }

  .institution {
    font-size: 1rem;
  }

  .location {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .hero-inner h1 {
    font-size: 2rem;
  }

  .hero-title {
    font-size: 1.2rem;
  }

  .cta-row {
    flex-direction: column;
  }

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

  .cert img {
    max-width: 120px;
  }

  .education-card {
    padding: 24px;
  }

  .education-icon {
    width: 50px;
    height: 50px;
  }

  .education-icon i {
    font-size: 1.5rem;
  }

  .education-info h3 {
    font-size: 1.2rem;
  }

  .course-badge {
    font-size: 0.85rem;
    padding: 6px 12px;
  }
}