:root {
  --bg: #0b0f17;
  --bg-elevated: #111827;
  --bg-card: #161f32;
  --bg-card-hover: #1c2741;
  --text: #f0f4f8;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  --accent: #38bdf8;
  --accent-glow: rgba(56, 189, 248, 0.35);
  --accent-secondary: #818cf8;
  --border: rgba(148, 163, 184, 0.12);
  --radius: 1rem;
  --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.45);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  transition: padding var(--transition);
}

.nav.scrolled {
  padding: 0.75rem 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

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

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a {
  color: var(--text-muted);
  position: relative;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--text);
}

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

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 0 5rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 80% 20%, rgba(56, 189, 248, 0.12), transparent 35%),
    radial-gradient(circle at 20% 80%, rgba(129, 140, 248, 0.1), transparent 35%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 4rem;
  align-items: center;
}

.eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-title {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--text-muted);
  max-width: 540px;
  margin-bottom: 1rem;
}

.hero-location {
  color: var(--text-subtle);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.75rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #0b0f17;
  box-shadow: 0 10px 30px -10px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px -10px var(--accent-glow);
}

.btn-secondary {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hero-photo {
  display: flex;
  justify-content: center;
}

.photo-frame {
  position: relative;
  width: min(100%, 360px);
  aspect-ratio: 1 / 1;
  border-radius: 2rem;
  overflow: hidden;
  border: 2px solid transparent;
  background:
    linear-gradient(var(--bg-card), var(--bg-card)) padding-box,
    linear-gradient(135deg, var(--accent), var(--accent-secondary)) border-box;
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.35);
}

.photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.photo-frame:hover img {
  transform: scale(1.04);
}

/* Sections */
.section {
  padding: 6rem 0;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 3rem;
}

.section-number {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--accent);
  font-family: monospace;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 640px;
  margin-top: -1.5rem;
  margin-bottom: 2.5rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
}

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

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.highlight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.highlight-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(56, 189, 248, 0.25);
  transform: translateY(-4px);
}

.highlight-value {
  font-size: 2.5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.highlight-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Experience */
.experience {
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elevated) 50%, var(--bg) 100%);
}

.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-secondary));
  opacity: 0.25;
}

.timeline-item {
  position: relative;
  padding-left: 3.5rem;
}

.timeline-marker {
  position: absolute;
  left: 0;
  top: 0.25rem;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--bg);
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.timeline-content:hover {
  background: var(--bg-card-hover);
  border-color: rgba(56, 189, 248, 0.2);
  transform: translateX(6px);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0.25rem;
  flex-wrap: wrap;
}

.timeline-role {
  font-size: 1.25rem;
  font-weight: 700;
}

.timeline-company {
  color: var(--accent);
  font-weight: 600;
  font-size: 1rem;
  margin-top: 0.25rem;
}

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

.timeline-location {
  color: var(--text-subtle);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.timeline-summary {
  color: var(--text-muted);
  margin-bottom: 1rem;
}

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

.timeline-list li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

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

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), background var(--transition), border-color var(--transition);
}

.project-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(56, 189, 248, 0.25);
  transform: translateY(-6px);
}

.project-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.project-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.project-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.project-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.project-list li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--text-subtle);
  font-size: 0.9rem;
}

.project-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

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

.project-tags span {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(56, 189, 248, 0.08);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.15);
}

/* Skills */
.skills {
  background: var(--bg-elevated);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition);
}

.skill-category:hover {
  border-color: rgba(56, 189, 248, 0.2);
}

.skill-category h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  color: var(--text);
}

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

.skill-tags span {
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 0.9rem;
  border-radius: 8px;
  background: rgba(148, 163, 184, 0.08);
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.skill-tags span:hover {
  background: rgba(56, 189, 248, 0.12);
  color: var(--accent);
  border-color: rgba(56, 189, 248, 0.25);
}

/* Education */
.education-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 600px;
  transition: border-color var(--transition);
}

.education-card:hover {
  border-color: rgba(56, 189, 248, 0.2);
}

.education-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: rgba(129, 140, 248, 0.1);
  color: var(--accent-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.education-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.education-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Contact */
.contact {
  padding-bottom: 4rem;
}

.contact-card {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(129, 140, 248, 0.08));
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  padding: 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  inset: -20%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.06), transparent 60%);
  z-index: -1;
}

.contact-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.contact-text {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 560px;
  margin: 0 auto 2rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.9rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-weight: 600;
  transition: transform var(--transition), border-color var(--transition), color var(--transition);
}

.contact-link:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--accent);
}

/* Footer */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-subtle);
  font-size: 0.9rem;
}

/* Sections are always visible; they get a subtle lift when they enter the viewport */
.section > .container {
  opacity: 1;
  transform: translateY(0);
  animation: none;
}

.section.revealed > .container {
  animation: sectionLift 0.5s ease-out forwards;
  will-change: transform;
}

@keyframes sectionLift {
  from {
    opacity: 0.92;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero load animation */
.hero-content {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeInUp 0.7s ease-out 0.15s forwards;
}

.hero-photo {
  opacity: 0;
  transform: translateY(16px);
  animation: fadeInUp 0.7s ease-out 0.3s forwards;
}

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

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .section > .container,
  .section.revealed > .container,
  .hero-content,
  .hero-photo {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
    will-change: auto;
  }

  .photo-frame img,
  .btn,
  .contact-link,
  .timeline-content,
  .project-card,
  .highlight-card,
  .skill-tags span {
    transition: none;
  }

  .photo-frame:hover img,
  .btn:hover,
  .contact-link:hover,
  .timeline-content:hover,
  .project-card:hover,
  .highlight-card:hover {
    transform: none;
  }
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }

  .hero-content {
    order: 2;
  }

  .hero-photo {
    order: 1;
  }

  .hero-subtitle,
  .hero-location {
    margin-left: auto;
    margin-right: auto;
  }

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

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

  .about-highlights {
    grid-template-columns: 1fr 1fr;
  }

  .timeline-header {
    flex-direction: column;
    gap: 0.5rem;
  }

  .timeline-date {
    white-space: normal;
  }

  .contact-card {
    padding: 2.5rem 1.5rem;
  }
}

@media (max-width: 600px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 280px;
    height: 100vh;
    background: var(--bg-elevated);
    flex-direction: column;
    padding: 5rem 2rem;
    gap: 1.5rem;
    border-left: 1px solid var(--border);
    transition: right var(--transition);
  }

  .nav-links.open {
    right: 0;
  }

  .menu-toggle {
    display: flex;
    z-index: 1001;
  }

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

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

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

  .about-highlights {
    grid-template-columns: 1fr;
  }

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

  .timeline-item {
    padding-left: 2.75rem;
  }

  .timeline::before {
    left: 10px;
  }

  .timeline-marker {
    width: 24px;
    height: 24px;
  }

  .timeline-content {
    padding: 1.5rem;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }
}