/* ============================================
   MD Babu Mia - Professional Portfolio
   Modern Dark Theme with Glass Morphism
   ============================================ */

/* CSS Variables */
:root {
  --bg: #03050f;
  --bg-soft: #070b1b;
  --bg-card: #0a0e1f;
  --glass: rgba(3, 5, 15, 0.75);
  --card: rgba(12, 16, 36, 0.8);
  --border: rgba(255, 255, 255, 0.1);
  --border-light: rgba(255, 255, 255, 0.15);
  --accent: #4df6ff;
  --accent-2: #9966ff;
  --accent-3: #ff6b9d;
  --accent-gradient: linear-gradient(135deg, var(--accent), var(--accent-2));
  --text: #f7f8ff;
  --text-secondary: rgba(247, 248, 255, 0.85);
  --muted: rgba(247, 248, 255, 0.65);
  --shadow: 0 30px 60px rgba(5, 12, 36, 0.55);
  --shadow-glow: 0 0 40px rgba(77, 246, 255, 0.15);
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 999px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: "Space Grotesk", "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(77, 246, 255, 0.08), transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(153, 102, 255, 0.06), transparent 40%),
    radial-gradient(circle at top center, rgba(32, 86, 201, 0.25), transparent 55%);
  pointer-events: none;
  z-index: -2;
}

/* Background Orbs */
.background-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.2;
  z-index: -3;
  animation: float 20s ease-in-out infinite;
}

.background-orb--one {
  width: 600px;
  height: 600px;
  top: -150px;
  right: -100px;
  background: var(--accent-2);
}

.background-orb--two {
  width: 500px;
  height: 500px;
  bottom: -200px;
  left: -150px;
  background: var(--accent);
  animation-delay: -5s;
}

.background-orb--three {
  width: 400px;
  height: 400px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--accent-3);
  opacity: 0.1;
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-20px) rotate(5deg); }
  50% { transform: translateY(0) rotate(0deg); }
  75% { transform: translateY(20px) rotate(-5deg); }
}

/* Particles Container */
#particles-container {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

/* ============================================
   Navigation
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem clamp(1.5rem, 5vw, 5rem);
  background: rgba(3, 5, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition-medium);
}

.site-header.scrolled {
  padding: 0.75rem clamp(1.5rem, 5vw, 5rem);
  background: rgba(3, 5, 15, 0.95);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text);
}

.logo__icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--bg);
}

.logo__text {
  font-weight: 600;
  font-size: 1.1rem;
  display: none;
}

@media (min-width: 768px) {
  .logo__text {
    display: block;
  }
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  transition: var(--transition-fast);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: "";
  position: absolute;
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

.nav__toggle[aria-expanded="true"] .hamburger {
  background: transparent;
}

.nav__toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg);
  top: 0;
}

.nav__toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg);
  top: 0;
}

.nav__menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: min(300px, 80vw);
  height: 100vh;
  background: var(--bg-soft);
  padding: 5rem 2rem 2rem;
  transition: right var(--transition-medium);
  display: flex;
  flex-direction: column;
  gap: 2rem;
  border-left: 1px solid var(--border);
}

.nav__menu.is-open {
  right: 0;
}

.nav__links {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.nav__links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 1.1rem;
  transition: color var(--transition-fast);
  position: relative;
}

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

.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.nav__cta:hover {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: var(--shadow-glow);
}

@media (min-width: 1024px) {
  .nav__toggle {
    display: none;
  }

  .nav__menu {
    position: static;
    width: auto;
    height: auto;
    background: none;
    padding: 0;
    flex-direction: row;
    align-items: center;
    gap: 2rem;
    border: none;
  }

  .nav__links {
    flex-direction: row;
    gap: 2rem;
  }

  .nav__links a {
    font-size: 0.95rem;
  }
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
  padding: 8rem clamp(1.5rem, 5vw, 5rem) 4rem;
  position: relative;
}

@media (min-width: 1024px) {
  .hero {
    grid-template-columns: 1.2fr 1fr;
    padding-top: 10rem;
  }
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(77, 246, 255, 0.1);
  border: 1px solid rgba(77, 246, 255, 0.2);
  color: var(--accent);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s ease forwards;
}

.hero__badge i {
  font-size: 0.9rem;
}

.hero h1 {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1.5rem;
}

.hero__greeting {
  font-size: 1.2rem;
  color: var(--muted);
  font-weight: 400;
  animation: fadeInUp 0.6s ease 0.1s forwards;
  opacity: 0;
}

.hero__name {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
  animation: fadeInUp 0.6s ease 0.2s forwards;
  opacity: 0;
}

.hero__title-wrapper {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  min-height: 2rem;
  animation: fadeInUp 0.6s ease 0.3s forwards;
  opacity: 0;
}

.hero__title {
  font-size: clamp(1rem, 2vw, 1.5rem);
  color: var(--accent-2);
  font-weight: 500;
}

.cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero__description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 600px;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease 0.4s forwards;
  opacity: 0;
}

.hero__description strong {
  color: var(--text);
}

.hero__description em {
  color: var(--accent);
  font-style: normal;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease 0.5s forwards;
  opacity: 0;
}

.hero__social {
  display: flex;
  gap: 1rem;
  animation: fadeInUp 0.6s ease 0.6s forwards;
  opacity: 0;
}

.hero__social a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--muted);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.hero__social a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

/* Hero Visual */
.hero__visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  animation: fadeIn 1s ease 0.3s forwards;
  opacity: 0;
}

.hero__avatar {
  position: relative;
  width: 280px;
  height: 280px;
}

.avatar-ring {
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent);
  border-radius: 50%;
  opacity: 0.3;
  animation: pulse-ring 3s ease-in-out infinite;
}

.avatar-ring--delayed {
  animation-delay: 1.5s;
}

@keyframes pulse-ring {
  0%, 100% {
    transform: scale(1);
    opacity: 0.3;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.1;
  }
}

.avatar-placeholder {
  position: absolute;
  inset: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: 50%;
  font-size: 5rem;
  color: var(--accent);
}

.hero__stats {
  display: flex;
  gap: 2rem;
}

.mini-stat {
  text-align: center;
}

.mini-stat__value {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
}

.mini-stat__label {
  font-size: 0.85rem;
  color: var(--muted);
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.85rem;
  animation: fadeIn 1s ease 1s forwards, bounce 2s ease infinite 2s;
  opacity: 0;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(45deg);
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.75rem;
  border-radius: var(--radius-full);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: var(--accent-gradient);
  color: var(--bg);
  box-shadow: 0 10px 40px rgba(77, 246, 255, 0.3);
}

.btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 50px rgba(77, 246, 255, 0.4);
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn--small {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
}

.btn--outline {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}

/* ============================================
   Main Content & Sections
   ============================================ */
main {
  padding: 0 clamp(1.5rem, 5vw, 5rem);
  max-width: 1400px;
  margin: 0 auto;
}

section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   About Section
   ============================================ */
.about__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: start;
}

@media (min-width: 1024px) {
  .about__content {
    grid-template-columns: 1.5fr 1fr;
  }
}

.about__text p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
  line-height: 1.8;
}

.about__text strong {
  color: var(--text);
}

.about__highlights {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-top: 2rem;
}

.highlight-item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.highlight-item:hover {
  border-color: var(--accent);
  transform: translateX(5px);
}

.highlight-item i {
  font-size: 1.5rem;
  color: var(--accent);
  margin-top: 0.25rem;
}

.highlight-item h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.highlight-item p {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
}

.info-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: sticky;
  top: 100px;
}

.info-card h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.info-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.info-list li {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.info-list strong {
  color: var(--muted);
}

.info-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ============================================
   Research Section
   ============================================ */
.research__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.research-card {
  padding: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-medium);
}

.research-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

.research-card__icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(77, 246, 255, 0.1);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.research-card__icon i {
  font-size: 1.5rem;
  color: var(--accent);
}

.research-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.research-card p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
  line-height: 1.7;
}

.research-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.research-card__tags span {
  padding: 0.35rem 0.75rem;
  background: rgba(153, 102, 255, 0.15);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--accent-2);
}

/* ============================================
   Projects Section
   ============================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.project-card {
  padding: 1.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-medium);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
}

.project-card--featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(77, 246, 255, 0.05), rgba(153, 102, 255, 0.05));
  border-color: rgba(77, 246, 255, 0.3);
}

@media (min-width: 768px) {
  .project-card--featured {
    grid-column: span 2;
  }
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.project-card__icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(77, 246, 255, 0.1);
  border-radius: var(--radius-md);
}

.project-card__icon i {
  font-size: 1.25rem;
  color: var(--accent);
}

.project-card__badges {
  display: flex;
  gap: 0.5rem;
}

.badge {
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.badge--featured {
  background: var(--accent-gradient);
  color: var(--bg);
}

.badge--stars {
  background: rgba(255, 215, 0, 0.15);
  color: #ffd700;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.project-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  word-break: break-word;
}

.project-card p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.project-card__tech span {
  padding: 0.25rem 0.6rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: var(--muted);
}

.project-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.project-card__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.project-card__links a:hover {
  color: var(--text);
}

.projects__cta {
  text-align: center;
}

/* ============================================
   Launches Section
   ============================================ */
.launch-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.launch-card {
  padding: 2rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: radial-gradient(circle at top, rgba(77, 246, 255, 0.06), transparent 65%), var(--glass);
  backdrop-filter: blur(14px);
}

.launch-card__tag {
  display: inline-flex;
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(153, 102, 255, 0.15);
  color: var(--accent-2);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}

.launch-card h3 {
  font-size: 1.35rem;
  margin-bottom: 1rem;
}

.launch-card p {
  color: var(--muted);
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.launch-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.launch-card li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding-left: 1.25rem;
  position: relative;
}

.launch-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* ============================================
   Publications Section
   ============================================ */
.publications__list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.publication-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  padding: 1.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.publication-card:hover {
  border-color: var(--accent);
}

.publication-card__year {
  background: rgba(77, 246, 255, 0.1);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  color: var(--accent);
  font-size: 0.9rem;
  height: fit-content;
}

.publication-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.publication-card__authors {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.publication-card__venue {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-2);
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}

.publication-card__abstract {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

.publication-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.publication-card__links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}

.publication-card__links a:hover {
  color: var(--text);
}

.publications__cta {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ============================================
   Skills Section
   ============================================ */
.skills__container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.skill-category {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.skill-category h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

.skill-bars {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.skill-bar__info {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.skill-bar__info span:last-child {
  color: var(--muted);
}

.skill-bar__track {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.skill-bar__fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  width: 0;
  transition: width 1s ease;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tag {
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================
   Experience/Timeline Section
   ============================================ */
.experience .timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.experience .timeline::before {
  content: "";
  position: absolute;
  left: 28px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}

.timeline__item {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.timeline__marker {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 2px solid var(--accent);
  border-radius: 50%;
  z-index: 1;
}

.timeline__marker i {
  color: var(--accent);
  font-size: 1.25rem;
}

.timeline__content {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.timeline__date {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  background: rgba(77, 246, 255, 0.1);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.timeline__content h3 {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.timeline__org {
  color: var(--accent-2);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.timeline__content > p:last-child {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
}

/* ============================================
   Roadmap Section
   ============================================ */
.roadmap__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.roadmap-card {
  padding: 2rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.roadmap-card__phase {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  background: rgba(153, 102, 255, 0.15);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--accent-2);
  margin-bottom: 1rem;
}

.roadmap-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.roadmap-card > p {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.roadmap-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.roadmap-card li {
  color: var(--text-secondary);
  font-size: 0.85rem;
  padding-left: 1rem;
  position: relative;
}

.roadmap-card li::before {
  content: ">";
  position: absolute;
  left: 0;
  color: var(--accent);
}

.roadmap-card__status {
  margin-top: auto;
}

.status-badge {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}

.status-badge--active {
  background: rgba(77, 246, 255, 0.15);
  color: var(--accent);
  border: 1px solid rgba(77, 246, 255, 0.3);
}

.status-badge--planned {
  background: rgba(153, 102, 255, 0.15);
  color: var(--accent-2);
  border: 1px solid rgba(153, 102, 255, 0.3);
}

.status-badge--future {
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted);
  border: 1px solid var(--border);
}

/* ============================================
   Contact Section
   ============================================ */
.contact__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
}

@media (min-width: 1024px) {
  .contact__content {
    grid-template-columns: 1fr 1.5fr;
  }
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  padding: 1.5rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.contact-item:hover {
  border-color: var(--accent);
}

.contact-item__icon {
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(77, 246, 255, 0.1);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.contact-item__icon i {
  font-size: 1.25rem;
  color: var(--accent);
}

.contact-item__details h4 {
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.contact-item__details a {
  color: var(--accent);
  text-decoration: none;
}

.contact-item__details p {
  color: var(--muted);
  font-size: 0.9rem;
}

.contact__social h4 {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

.social-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.social-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
}

.social-card i {
  font-size: 1.75rem;
  color: var(--accent);
}

.social-card span {
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
}

.social-card small {
  color: var(--muted);
  font-size: 0.8rem;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  margin-top: 5rem;
  border-top: 1px solid var(--border);
  padding: 3rem clamp(1.5rem, 5vw, 5rem);
}

.footer__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 1400px;
  margin: 0 auto 2rem;
}

@media (min-width: 768px) {
  .footer__content {
    grid-template-columns: 1.5fr 1fr;
  }
}

.footer__brand {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.footer__brand .logo__icon {
  flex-shrink: 0;
}

.footer__brand p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer__links {
  display: flex;
  gap: 3rem;
}

.footer__column h4 {
  font-size: 0.9rem;
  margin-bottom: 1rem;
  color: var(--text);
}

.footer__column a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  max-width: 1400px;
  margin: 0 auto;
}

.footer__bottom p {
  color: var(--muted);
  font-size: 0.85rem;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.back-to-top:hover {
  color: var(--text);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.pre-animate {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.is-visible {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* Staggered animation delays */
.research__grid .research-card:nth-child(1) { transition-delay: 0s; }
.research__grid .research-card:nth-child(2) { transition-delay: 0.1s; }
.research__grid .research-card:nth-child(3) { transition-delay: 0.2s; }
.research__grid .research-card:nth-child(4) { transition-delay: 0.3s; }
.research__grid .research-card:nth-child(5) { transition-delay: 0.4s; }
.research__grid .research-card:nth-child(6) { transition-delay: 0.5s; }

/* ============================================
   Responsive Adjustments
   ============================================ */
@media (max-width: 768px) {
  .hero {
    text-align: center;
  }

  .hero__content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__social {
    justify-content: center;
  }

  .hero__avatar {
    width: 200px;
    height: 200px;
  }

  .avatar-placeholder {
    font-size: 3rem;
  }

  .publication-card {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .publication-card__year {
    width: fit-content;
  }

  .experience .timeline::before {
    left: 18px;
  }

  .timeline__item {
    grid-template-columns: 40px 1fr;
    gap: 1rem;
  }

  .timeline__marker {
    width: 40px;
    height: 40px;
  }

  .timeline__marker i {
    font-size: 1rem;
  }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* Print styles */
@media print {
  .site-header,
  .scroll-indicator,
  .hero__social,
  .hero__actions,
  .nav__cta,
  .back-to-top {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }

  .hero__name {
    -webkit-text-fill-color: black;
    background: none;
  }
}