/* ============================================
   VIKASH MEGHWAL PORTFOLIO - style.css
   ============================================ */

/* ===== CSS VARIABLES ===== */
:root {
  --bg-primary: #0a192f;
  --bg-secondary: #112240;
  --bg-card: #1a2f4e;
  --accent: #64ffda;
  --accent-dim: rgba(100, 255, 218, 0.1);
  --accent-glow: rgba(100, 255, 218, 0.3);
  --text-primary: #ccd6f6;
  --text-secondary: #8892b0;
  --text-white: #e6f1ff;
  --gold: #f6c90e;
  --gold-dim: rgba(246, 201, 14, 0.15);
  --nav-height: 70px;
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  --font-body: 'Inter', sans-serif;
  --font-heading: 'Space Grotesk', sans-serif;
}

/* Light mode overrides */
body.light-mode {
  --bg-primary: #f0f4f8;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --text-primary: #1a2a4a;
  --text-secondary: #4a5568;
  --text-white: #1a2a4a;
  --accent-dim: rgba(0, 150, 136, 0.08);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background-color 0.4s, color 0.4s;
}
a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { opacity: 0.8; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
strong { color: var(--text-white); }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(10, 25, 47, 0.92);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
  z-index: 1000;
  border-bottom: 1px solid rgba(100, 255, 218, 0.08);
  transition: var(--transition);
}
body.light-mode .navbar { background: rgba(240, 244, 248, 0.95); border-bottom: 1px solid rgba(0,0,0,0.08); }
.navbar.scrolled { box-shadow: 0 4px 30px rgba(0,0,0,0.3); }
.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 2px;
  cursor: pointer;
}
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  position: relative;
  padding-bottom: 4px;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 1rem; }
.theme-toggle, .hamburger {
  background: transparent;
  border: 1px solid rgba(100, 255, 218, 0.3);
  color: var(--accent);
  width: 38px; height: 38px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: var(--transition);
  display: flex; align-items: center; justify-content: center;
}
.theme-toggle:hover, .hamburger:hover { background: var(--accent-dim); }
.hamburger { display: none; }

/* ===== HERO ===== */
.hero-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--nav-height) 5% 0;
}
#particleCanvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 4rem;
  max-width: 1100px;
  width: 100%;
}
.hero-photo-wrapper {
  flex-shrink: 0;
  width: 240px; height: 240px;
  border-radius: 50%;
  position: relative;
}
.hero-photo-wrapper::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: conic-gradient(var(--accent), transparent, var(--accent));
  animation: rotate-border 4s linear infinite;
  z-index: -1;
}
.hero-photo-wrapper::after {
  content: '';
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  animation: pulse-glow 2.5s ease-in-out infinite;
  z-index: -2;
}
@keyframes rotate-border {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}
@keyframes pulse-glow {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.9; transform: scale(1.05); }
}
.hero-photo {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-primary);
}
.hero-photo-fallback {
  display: none;
  width: 100%; height: 100%;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 4px solid var(--bg-primary);
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  color: var(--accent);
}
.hero-text { flex: 1; }
.hero-greeting {
  font-size: 1rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.1;
  margin-bottom: 1rem;
}
.hero-typewriter {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  font-weight: 600;
  color: var(--accent);
  min-height: 2rem;
  margin-bottom: 1.2rem;
}
.cursor {
  animation: blink 1s step-end infinite;
  color: var(--accent);
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}
.hero-affiliation {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.hero-affiliation i { color: var(--accent); }
.hero-buttons {
  display: flex;
  gap: 1rem;
  margin: 1.5rem 0 1.2rem;
  flex-wrap: wrap;
}
.btn {
  padding: 0.75rem 1.8rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: transparent;
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--accent-glow);
}
.btn-outline {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent-dim);
  transform: translateY(-3px);
  box-shadow: 0 8px 25px var(--accent-glow);
}
.btn-full { width: 100%; justify-content: center; }
.hero-socials { display: flex; gap: 1rem; }
.hero-socials a {
  width: 42px; height: 42px;
  border: 1px solid rgba(100, 255, 218, 0.3);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  transition: var(--transition);
}
.hero-socials a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-3px);
}
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--accent);
  font-size: 1.2rem;
  animation: bounce 2s infinite;
  z-index: 1;
  cursor: pointer;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

/* ===== SECTIONS ===== */
.section { padding: 100px 5%; }
.section-alt { background-color: var(--bg-secondary); }
.container { max-width: 1100px; margin: 0 auto; }
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 3.5rem;
  position: relative;
  padding-bottom: 1rem;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 60px; height: 3px;
  background: var(--accent);
  border-radius: 2px;
}
.accent { color: var(--accent); }

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

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}
.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.2rem;
  font-size: 1rem;
  line-height: 1.8;
}
.about-counters {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.counter-card {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  text-align: center;
  transition: var(--transition);
}
.counter-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px var(--accent-glow);
}
.counter-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.counter-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ===== RESEARCH ===== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}
.research-card {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--border-radius);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.research-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 0;
  background: var(--accent);
  transition: height 0.4s ease;
}
.research-card:hover::before { height: 100%; }
.research-card:hover {
  border-color: var(--accent);
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}
.research-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.research-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.research-badge.current { background: rgba(100, 255, 218, 0.15); color: var(--accent); }
.research-badge.masters { background: rgba(130, 80, 255, 0.15); color: #a78bfa; }
.research-badge.ugp { background: rgba(255, 150, 80, 0.15); color: #fb923c; }
.research-date { font-size: 0.8rem; color: var(--text-secondary); }
.research-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--text-white);
  margin-bottom: 0.8rem;
  line-height: 1.4;
}
.research-card p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0.8rem; }
.research-supervisor { font-size: 0.82rem !important; color: var(--accent) !important; margin-top: 1rem !important; }

/* ===== PUBLICATIONS ===== */
.pub-list { display: flex; flex-direction: column; gap: 2rem; }
.pub-card {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--border-radius);
  padding: 2rem;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  transition: var(--transition);
}
.pub-card:hover {
  border-color: var(--accent);
  transform: translateX(8px);
  box-shadow: var(--shadow);
}
.pub-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent-dim);
  line-height: 1;
  min-width: 60px;
  border: 2px solid rgba(100, 255, 218, 0.15);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  padding: 0.5rem;
  transition: var(--transition);
}
.pub-card:hover .pub-number { color: var(--accent); border-color: var(--accent); }
.pub-journal {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}
.pub-content h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--text-white);
  margin-bottom: 0.6rem;
  line-height: 1.5;
}
.pub-authors { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 0.8rem; }
.pub-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

/* ===== TAGS ===== */
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1rem; }
.tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.25rem 0.7rem;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: 20px;
  letter-spacing: 0.3px;
  transition: var(--transition);
}
.tag:hover { background: var(--accent); color: var(--bg-primary); }

/* ===== SKILLS ===== */
.skills-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 2.5rem;
}
.skill-tab {
  padding: 0.6rem 1.4rem;
  border-radius: 8px;
  border: 1px solid rgba(100, 255, 218, 0.2);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-body);
}
.skill-tab:hover, .skill-tab.active {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}
.skill-panel { display: none; }
.skill-panel.active { display: block; }
.skill-bar-list { display: flex; flex-direction: column; gap: 1.5rem; }
.skill-bar {
  --skill-name: '';
  --skill-level: 0;
}
.skill-bar-inner {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.skill-bar-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
  color: var(--text-primary);
  font-weight: 500;
}
.skill-bar-track {
  height: 8px;
  background: rgba(100, 255, 218, 0.1);
  border-radius: 4px;
  overflow: hidden;
}
.skill-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #4fc3f7);
  border-radius: 4px;
  width: 0%;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== TIMELINE (EXPERIENCE) ===== */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 7px; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}
.timeline-item {
  position: relative;
  margin-bottom: 2.5rem;
}
.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 1.5rem;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 12px var(--accent-glow);
}
.timeline-card {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--border-radius);
  padding: 1.8rem;
  transition: var(--transition);
}
.timeline-card:hover {
  border-color: var(--accent);
  transform: translateX(8px);
  box-shadow: var(--shadow);
}
.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}
.timeline-header h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--text-white);
}
.timeline-date {
  font-size: 0.8rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-weight: 600;
  white-space: nowrap;
}
.timeline-company { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 1rem; }
.timeline-card ul { padding-left: 1.2rem; list-style: disc; }
.timeline-card ul li { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 0.4rem; }

/* ===== PROJECTS ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--border-radius);
  padding: 2rem;
  transition: var(--transition);
  cursor: pointer;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-10px);
  box-shadow: 0 20px 50px rgba(0,0,0,0.3), 0 0 30px var(--accent-glow);
}
.project-icon {
  width: 56px; height: 56px;
  background: var(--accent-dim);
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 1.2rem;
  transition: var(--transition);
}
.project-card:hover .project-icon {
  background: var(--accent);
  color: var(--bg-primary);
}
.project-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--text-white);
  margin-bottom: 0.7rem;
}
.project-card p { font-size: 0.88rem; color: var(--text-secondary); margin-bottom: 0.5rem; line-height: 1.6; }

/* ===== AWARDS ===== */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.award-card {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  display: flex;
  gap: 1.2rem;
  align-items: flex-start;
  transition: var(--transition);
}
.award-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: var(--shadow);
}
.award-card.gold { border-color: rgba(246, 201, 14, 0.2); background: linear-gradient(135deg, var(--bg-card), rgba(246,201,14,0.03)); }
.award-card.gold:hover { border-color: var(--gold); box-shadow: 0 10px 30px rgba(246,201,14,0.15); }
.award-icon {
  width: 46px; height: 46px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  flex-shrink: 0;
  background: var(--accent-dim);
  color: var(--accent);
}
.award-card.gold .award-icon { background: var(--gold-dim); color: var(--gold); }
.award-content h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text-white);
  margin-bottom: 0.3rem;
}
.award-content p { font-size: 0.83rem; color: var(--text-secondary); line-height: 1.5; }
.award-year {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.15rem 0.6rem;
  border-radius: 20px;
}
.award-card.gold .award-year { color: var(--gold); background: var(--gold-dim); }

/* ===== EDUCATION TIMELINE ===== */
.edu-timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}
.edu-timeline::before {
  content: '';
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  transform: translateX(-50%);
}
.edu-item {
  position: relative;
  width: 50%;
  padding: 0 3rem 2.5rem;
}
.edu-item.left { left: 0; text-align: right; }
.edu-item.right { left: 50%; text-align: left; }
.edu-dot {
  position: absolute;
  top: 0.5rem;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg-secondary);
  box-shadow: 0 0 15px var(--accent-glow);
}
.edu-item.left .edu-dot { right: -8px; }
.edu-item.right .edu-dot { left: -8px; }
.edu-card {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  transition: var(--transition);
}
.edu-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}
.edu-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0.2rem 0.7rem;
  border-radius: 20px;
  margin-bottom: 0.6rem;
}
.edu-badge.current { background: var(--accent-dim); color: var(--accent); }
.edu-card h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--text-white);
  margin-bottom: 0.4rem;
}
.edu-institute { font-size: 0.85rem; color: var(--accent); margin-bottom: 0.3rem; }
.edu-card p { font-size: 0.83rem; color: var(--text-secondary); }
.edu-date {
  display: inline-block;
  margin-top: 0.6rem;
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.2rem 0.7rem;
  border-radius: 20px;
  font-weight: 600;
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: start;
}
.contact-info h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--text-white);
  margin-bottom: 1rem;
}
.contact-info > p { color: var(--text-secondary); margin-bottom: 2rem; line-height: 1.8; }
.contact-details { display: flex; flex-direction: column; gap: 1rem; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.8rem 1rem;
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.1);
  border-radius: 10px;
  transition: var(--transition);
}
.contact-item:hover { border-color: var(--accent); transform: translateX(5px); }
.contact-item > i {
  color: var(--accent);
  font-size: 1.1rem;
  width: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}
.contact-item > div { display: flex; flex-direction: column; }
.contact-item span { font-size: 0.72rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }
.contact-item a { font-size: 0.9rem; color: var(--text-primary); }
.contact-item a:hover { color: var(--accent); }
.contact-form { display: flex; flex-direction: column; gap: 1.2rem; }
.form-group { display: flex; flex-direction: column; gap: 0.4rem; }
.form-group label { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); }
.form-group input, .form-group textarea {
  background: var(--bg-card);
  border: 1px solid rgba(100, 255, 218, 0.15);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: var(--transition);
  resize: vertical;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-secondary); }

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid rgba(100, 255, 218, 0.08);
  padding: 2.5rem 5%;
  text-align: center;
}
.footer p { color: var(--text-secondary); font-size: 0.88rem; margin-bottom: 0.8rem; }
.footer-links { display: flex; justify-content: center; gap: 1.2rem; margin: 1rem 0; }
.footer-links a {
  width: 38px; height: 38px;
  border: 1px solid rgba(100, 255, 218, 0.2);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-dim); }
.footer-copy { color: var(--text-secondary); opacity: 0.6; font-size: 0.8rem; }

/* ===== MOBILE MENU ===== */
@media (max-width: 900px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    background: var(--bg-secondary);
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    gap: 1.5rem;
    transform: translateY(-120%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
    z-index: 999;
  }
  .nav-links.open { transform: translateY(0); }
  .hamburger { display: flex; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero-content { flex-direction: column; text-align: center; gap: 2rem; }
  .hero-photo-wrapper { width: 180px; height: 180px; }
  .hero-buttons, .hero-socials { justify-content: center; }
  .hero-affiliation { justify-content: center; }
  .about-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .edu-timeline::before { left: 20px; }
  .edu-item { width: 100%; left: 0 !important; padding-left: 3.5rem; padding-right: 0; text-align: left !important; }
  .edu-dot { left: 12px !important; right: auto !important; }
  .pub-card { flex-direction: column; gap: 1rem; }
  .pub-number { font-size: 2rem; width: auto; }
}

@media (max-width: 480px) {
  .section { padding: 70px 4%; }
  .section-title { font-size: 1.8rem; }
  .research-grid, .projects-grid, .awards-grid { grid-template-columns: 1fr; }
  .about-counters { grid-template-columns: 1fr 1fr; }
}