/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
  --color-bg: #0a0a0a;
  --color-bg-alt: #111111;
  --color-surface: #1a1a1a;
  --color-surface-hover: #222222;
  --color-border: #2a2a2a;
  --color-text: #d4d4d4;
  --color-text-muted: #777777;
  --color-text-heading: #ffffff;
  --color-accent: #3b82f6;
  --color-accent-hover: #60a5fa;
  --color-accent-dim: rgba(59, 130, 246, 0.12);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 1100px;
  --transition: 0.25s ease;
  --radius: 10px;
}

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

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

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

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

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

ul {
  list-style: none;
}

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

.section {
  padding: 96px 0;
}

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

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-heading);
  margin-bottom: 48px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background-color var(--transition);
}

.navbar.scrolled {
  border-bottom-color: var(--color-border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text-heading);
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}

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

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

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

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

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

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

/* Mobile toggle */
.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-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.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
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(59, 130, 246, 0.07) 0%, transparent 70%);
}

.hero-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 64px;
  width: 100%;
}

.hero-content {
  flex: 1;
  min-width: 0;
}

.hero-photo-wrap {
  flex-shrink: 0;
}

.hero-photo {
  width: 280px;
  height: 280px;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  border: 3px solid var(--color-border);
  box-shadow: 0 0 0 8px rgba(59, 130, 246, 0.08), 0 24px 48px rgba(0, 0, 0, 0.5);
  display: block;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-accent);
  margin-bottom: 14px;
  font-weight: 400;
}

.hero-name {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 700;
  color: var(--color-text-heading);
  line-height: 1.1;
  margin-bottom: 12px;
  letter-spacing: -1px;
}

.hero-title {
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

.hero-description {
  font-size: 1.05rem;
  color: var(--color-text);
  max-width: 540px;
  margin-bottom: 24px;
  line-height: 1.8;
}

.hero-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.hero-badge svg {
  color: var(--color-accent);
  flex-shrink: 0;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 26px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-sans);
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.35);
}

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

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* ============================================
   About
   ============================================ */
.about-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 64px;
  align-items: start;
}

.about-text p {
  color: var(--color-text);
  margin-bottom: 16px;
  max-width: 600px;
  line-height: 1.8;
}

.about-text p:last-child {
  margin-bottom: 0;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  min-width: 280px;
}

.stat-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

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

.stat-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-mono);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  display: block;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 500;
}

/* ============================================
   Skills
   ============================================ */
.skills-groups {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.skill-group {
  display: flex;
  align-items: baseline;
  gap: 24px;
}

.skill-group-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  min-width: 200px;
  flex-shrink: 0;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  display: inline-block;
  padding: 7px 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--color-text);
  font-family: var(--font-mono);
  transition: all var(--transition);
  cursor: default;
}

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

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

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

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

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

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 10px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color-bg);
  border: 2px solid var(--color-accent);
  z-index: 1;
  box-shadow: 0 0 0 4px var(--color-bg);
}

.timeline-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 24px 28px;
  transition: border-color var(--transition);
}

.timeline-content:hover {
  border-color: rgba(59, 130, 246, 0.4);
}

.timeline-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.timeline-date {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 4px;
}

.timeline-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-bottom: 2px;
}

.timeline-company {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.timeline-header-right {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.company-logo {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 8px;
  background-color: #ffffff;
  padding: 4px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
}

.timeline-badge {
  display: inline-block;
  padding: 4px 10px;
  background-color: var(--color-accent-dim);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 999px;
  font-size: 0.72rem;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

.timeline-summary {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: 14px;
  font-style: italic;
  border-left: 2px solid var(--color-border);
  padding-left: 12px;
}

.timeline-highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.timeline-highlights li {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.65;
  padding-left: 18px;
  position: relative;
}

.timeline-highlights li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-size: 0.75rem;
  top: 3px;
}

/* ============================================
   Contact
   ============================================ */
.contact-container {
  text-align: center;
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contact-description {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 480px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

.contact-container .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition);
}

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

.contact-icon {
  color: var(--color-accent);
  flex-shrink: 0;
  transition: color var(--transition);
}

.contact-link:hover .contact-icon {
  color: var(--color-accent-hover);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 28px 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 900px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-stats {
    min-width: unset;
    grid-template-columns: repeat(4, 1fr);
  }

  .skill-group {
    flex-direction: column;
    gap: 10px;
  }

  .skill-group-label {
    min-width: unset;
  }
}

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

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background-color: rgba(10, 10, 10, 0.97);
    backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    border-bottom: 1px solid transparent;
  }

  .nav-links.open {
    max-height: 360px;
    padding: 16px 0;
    border-bottom-color: var(--color-border);
  }

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 12px 0;
    font-size: 1rem;
  }

  .nav-links a::after {
    display: none;
  }

  .section {
    padding: 72px 0;
  }

  .section-title {
    font-size: 1.6rem;
    margin-bottom: 36px;
  }

  .hero {
    min-height: 90vh;
  }

  .hero-layout {
    flex-direction: column-reverse;
    gap: 36px;
    text-align: center;
  }

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

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

  .hero-photo {
    width: 180px;
    height: 180px;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-link {
    width: 100%;
    max-width: 320px;
    justify-content: center;
  }

  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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