/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --color-bg: #f8f9fc;
  --color-bg-alt: #ffffff;
  --color-bg-card: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #555568;
  --color-accent: #2d5f8a;
  --color-accent-light: #3a7cb8;
  --color-accent-glow: rgba(45, 95, 138, 0.08);
  --color-accent-glow-strong: rgba(45, 95, 138, 0.15);
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-hover: rgba(45, 95, 138, 0.25);
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --color-gradient-1: #2d5f8a;
  --color-gradient-2: #7c5cbf;
  --color-gradient-3: #d4568a;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Lora', 'Georgia', serif;
  --max-width: 1100px;
  --nav-height: 72px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ============================================
   Scroll Progress Bar
   ============================================ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gradient-1), var(--color-gradient-2), var(--color-gradient-3));
  z-index: 10000;
  width: 0%;
  transition: width 0.1s linear;
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
  position: relative;
}

.section-alt {
  background: var(--color-bg-alt);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gradient-1), var(--color-gradient-2));
  border-radius: 2px;
}

.subsection-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 24px;
  margin-top: 48px;
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-60px) rotateY(8deg);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0) rotateY(0);
}

/* ============================================
   3D Tilt Card
   ============================================ */
.tilt-card {
  transform-style: preserve-3d;
  perspective: 1000px;
  transition: transform 0.4s cubic-bezier(0.03, 0.98, 0.52, 0.99),
              box-shadow 0.4s ease;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(248, 249, 252, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.nav.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: var(--color-accent);
}

.nav-menu {
  display: flex;
  gap: 32px;
  align-items: center;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gradient-1), var(--color-gradient-2));
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent-light);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
  border-radius: 1px;
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #f8f9fc 0%, #edf2f8 50%, #f0ecf7 100%);
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  z-index: 0;
  animation: float 8s ease-in-out infinite;
}

.hero-glow-1 {
  width: 500px;
  height: 500px;
  background: rgba(45, 95, 138, 0.08);
  top: 10%;
  right: 10%;
  animation-delay: 0s;
}

.hero-glow-2 {
  width: 400px;
  height: 400px;
  background: rgba(124, 92, 191, 0.06);
  bottom: 10%;
  left: 5%;
  animation-delay: -4s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  25% { transform: translate(30px, -20px) scale(1.05); }
  50% { transform: translate(-20px, 20px) scale(0.95); }
  75% { transform: translate(20px, 10px) scale(1.02); }
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}

.hero-content {
  max-width: 600px;
  flex: 1;
}

/* Hero Profile Image */
.hero-image {
  flex-shrink: 0;
}

.hero-image-wrapper {
  position: relative;
  width: 260px;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-profile-img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  position: relative;
  z-index: 2;
  border: 3px solid rgba(45, 95, 138, 0.2);
  box-shadow: 0 8px 32px rgba(45, 95, 138, 0.12), 0 0 0 1px rgba(45, 95, 138, 0.05);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.hero-image-wrapper:hover .hero-profile-img {
  border-color: rgba(45, 95, 138, 0.4);
  box-shadow: 0 12px 48px rgba(45, 95, 138, 0.2), 0 0 0 1px rgba(45, 95, 138, 0.1);
  transform: scale(1.03);
}

.hero-image-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1.5px solid rgba(45, 95, 138, 0.12);
  animation: ringPulse 4s ease-in-out infinite;
  z-index: 1;
}

.hero-image-ring-2 {
  inset: -16px;
  border-color: rgba(124, 92, 191, 0.08);
  animation-delay: -2s;
  animation-duration: 5s;
}

@keyframes ringPulse {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.08); opacity: 1; }
}

.hero-image-glow {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 95, 138, 0.1), transparent 70%);
  filter: blur(30px);
  z-index: 0;
  animation: glowPulse 3s ease-in-out infinite alternate;
}

@keyframes glowPulse {
  0% { opacity: 0.4; transform: scale(1); }
  100% { opacity: 0.8; transform: scale(1.15); }
}

.hero-greeting {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-name {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 600;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-name-line {
  display: block;
}

.hero-name-accent {
  background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2), var(--color-gradient-3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title {
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  min-height: 2rem;
}

.typed-cursor {
  color: var(--color-accent);
  animation: blink 1s step-end infinite;
  font-weight: 300;
}

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

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 560px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
  color: #fff;
  box-shadow: 0 4px 20px rgba(45, 95, 138, 0.3);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(45, 95, 138, 0.45);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-border-hover);
}

.btn-outline:hover {
  background: var(--color-accent-glow);
  color: var(--color-accent-light);
  transform: translateY(-3px);
  border-color: var(--color-accent);
  box-shadow: 0 8px 30px rgba(45, 95, 138, 0.15);
}

.hero-links {
  display: flex;
  gap: 16px;
}

.social-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  background: rgba(45, 95, 138, 0.03);
}

.social-icon:hover {
  color: var(--color-accent);
  border-color: var(--color-border-hover);
  background: var(--color-accent-glow);
  transform: translateY(-4px) rotateZ(-5deg);
  box-shadow: 0 8px 24px rgba(45, 95, 138, 0.2);
}

/* Hero Scroll Indicator */
.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 1;
}

.hero-scroll-indicator span {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-border);
  position: relative;
  overflow: hidden;
}

.scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(180deg, transparent, var(--color-accent));
  animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
  0% { top: -50%; }
  100% { top: 110%; }
}

/* ============================================
   About Section
   ============================================ */
.about-content p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  max-width: 800px;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}

a.highlight-item {
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

.highlight-item {
  text-align: center;
  padding: 28px 16px;
  background: var(--color-bg-card);
  border-radius: 16px;
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.highlight-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-gradient-1), var(--color-gradient-2));
  opacity: 0;
  transition: opacity var(--transition);
}

.highlight-item:hover::before {
  opacity: 1;
}

.highlight-item:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 32px rgba(45, 95, 138, 0.1);
}

.highlight-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 4px;
}

.highlight-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ============================================
   Timeline (Experience)
   ============================================ */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-border));
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 3px solid var(--color-accent);
  z-index: 1;
  transition: all var(--transition);
  box-shadow: 0 0 0 4px transparent;
}

.timeline-item:hover .timeline-marker {
  box-shadow: 0 0 0 6px var(--color-accent-glow);
  background: var(--color-accent);
}

.timeline-item:first-child .timeline-marker {
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent-glow-strong);
}

.timeline-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 28px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.timeline-content:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 32px rgba(45, 95, 138, 0.08);
}

.timeline-date {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  display: block;
  margin-bottom: 4px;
}

.timeline-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.timeline-company {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.timeline-details {
  list-style: none;
}

.timeline-details li {
  position: relative;
  padding-left: 20px;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  line-height: 1.6;
}

.timeline-details li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.5;
}

/* ============================================
   Education
   ============================================ */
.education-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 32px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.education-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 32px rgba(45, 95, 138, 0.08);
}

.education-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
  gap: 16px;
  flex-wrap: wrap;
}

.education-degree {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.education-school {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.education-date {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  white-space: nowrap;
}

.education-details p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

/* Awards Grid */
.awards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.award-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 24px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.award-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(45, 95, 138, 0.04), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.award-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 12px 40px rgba(45, 95, 138, 0.12);
}

.award-card:hover::after {
  opacity: 1;
}

.award-icon {
  color: var(--color-accent);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.award-card h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
}

.award-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  position: relative;
  z-index: 1;
}

/* Featured Award Card (with image) */
a.award-card,
a.project-card {
  text-decoration: none;
  color: inherit;
}

.award-card-featured {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  padding: 0;
  overflow: hidden;
}

.award-card-img {
  width: 280px;
  height: auto;
  object-fit: cover;
  flex-shrink: 0;
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.award-card-featured:hover .award-card-img {
  transform: scale(1.05);
}

.award-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 1;
}

@media (max-width: 768px) {
  .award-card-featured {
    flex-direction: column;
  }

  .award-card-img {
    width: 100%;
    height: 180px;
  }
}

/* Certifications */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.cert-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 20px;
  transition: all var(--transition);
}

.cert-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 32px rgba(45, 95, 138, 0.1);
}

.cert-icon {
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.cert-info h4 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
  line-height: 1.4;
}

.cert-info p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

@media (max-width: 768px) {
  .certifications-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Research Section
   ============================================ */
.research-interests {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 32px;
  margin-top: 8px;
}

.research-interests .subsection-title {
  margin-top: 0;
  margin-bottom: 20px;
}

.interest-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: linear-gradient(135deg, rgba(45, 95, 138, 0.06), rgba(124, 92, 191, 0.04));
  color: var(--color-accent);
  border: 1px solid rgba(45, 95, 138, 0.12);
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: default;
  position: relative;
}

.tag::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  opacity: 0.5;
  transition: all var(--transition);
  flex-shrink: 0;
}

.tag:hover {
  background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
  color: #fff;
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(45, 95, 138, 0.25);
}

.tag:hover::before {
  background: #fff;
  opacity: 1;
}

.publication-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 12px;
  padding: 28px 32px;
  margin-top: 16px;
  transition: all var(--transition);
}

.publication-card:hover {
  border-color: var(--color-border-hover);
  border-left-color: var(--color-accent);
  box-shadow: 0 12px 40px rgba(45, 95, 138, 0.1);
}

.publication-type {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.publication-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.5;
}

.publication-authors {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.publication-venue {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.publication-description {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================
   Projects Section
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.project-card-glow {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-glow-strong), transparent 70%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s ease;
  transform: translate(-50%, -50%);
  z-index: 0;
}

.project-card:hover .project-card-glow {
  opacity: 1;
}

.project-card:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 20px 60px rgba(45, 95, 138, 0.12);
}

.project-icon {
  color: var(--color-accent);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.project-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}

.project-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  position: relative;
  z-index: 1;
}

.project-tags span {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 4px 12px;
  background: var(--color-accent-glow);
  color: var(--color-accent);
  border-radius: 6px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.project-tags span:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* ============================================
   Skills Section
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.skill-category {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 28px;
  transition: all var(--transition);
}

.skill-category:hover {
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 32px rgba(45, 95, 138, 0.08);
}

.skill-category h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

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

.skill-tags span {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 14px;
  background: var(--color-accent-glow);
  color: var(--color-accent);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  cursor: default;
}

.skill-tags span:hover {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 4px 16px rgba(45, 95, 138, 0.3);
}

/* ============================================
   Contact Section
   ============================================ */
.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-text {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 36px;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  color: var(--color-text-secondary);
  padding: 14px 28px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  background: var(--color-bg-card);
}

.contact-item:hover {
  color: var(--color-accent);
  background: var(--color-accent-glow);
  border-color: var(--color-border-hover);
  box-shadow: 0 8px 32px rgba(45, 95, 138, 0.12);
}

.contact-item svg {
  flex-shrink: 0;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 900px) {
  .about-highlights {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(248, 249, 252, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-link {
    display: block;
    padding: 12px 24px;
    font-size: 1rem;
  }

  .nav-link::after {
    display: none;
  }

  .hero-layout {
    flex-direction: column-reverse;
    text-align: center;
    gap: 32px;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-image-wrapper {
    width: 180px;
    height: 180px;
  }

  .hero-profile-img {
    width: 140px;
    height: 140px;
  }

  .hero-image-glow {
    width: 140px;
    height: 140px;
  }

  .hero-links {
    justify-content: center;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero {
    min-height: auto;
    padding-top: calc(var(--nav-height) + 48px);
    padding-bottom: 80px;
  }

  .hero-name {
    font-size: 2.25rem;
  }

  .hero-scroll-indicator {
    display: none;
  }

  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .education-header {
    flex-direction: column;
  }

  .about-highlights {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .publication-card {
    padding: 20px;
  }

  .hero-cta {
    flex-direction: column;
    gap: 12px;
  }

  .btn {
    text-align: center;
    justify-content: center;
  }

  /* Disable 3D tilt on mobile for performance */
  .tilt-card {
    transform: none !important;
  }
}

@media (max-width: 480px) {
  .about-highlights {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .highlight-item {
    padding: 16px 12px;
  }

  .highlight-number {
    font-size: 1.6rem;
  }
}