/* ============================================
   Brand Colors & Variables
   ============================================ */
:root {
  --navy: #0a1628;
  --navy-light: #111d33;
  --navy-mid: #162240;
  --blue-accent: #2563eb;
  --blue-glow: #3b82f6;
  --white: #ffffff;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --max-width: 1100px;
  --transition: 0.3s ease;
}

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

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

body {
  font-family: var(--font-main);
  background: var(--navy);
  color: var(--gray-200);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--blue-glow);
}

ul {
  list-style: none;
}

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

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

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 22, 40, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  transition: background var(--transition);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--gray-400);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color var(--transition);
}

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

.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(--gray-300);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(37, 99, 235, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 99, 235, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

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

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--blue-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

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

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--gray-400);
  max-width: 600px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
  flex-wrap: wrap;
}

.hero-metrics {
  display: flex;
  gap: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  flex-wrap: wrap;
}

.metric-value {
  display: block;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 4px;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  font-family: var(--font-main);
}

.btn-primary {
  background: var(--blue-accent);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--blue-glow);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--gray-300);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

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

/* ============================================
   Sections
   ============================================ */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--navy-light);
}

.section-header {
  margin-bottom: 56px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--blue-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
}

/* ============================================
   About
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text p {
  margin-bottom: 20px;
  color: var(--gray-300);
  font-size: 1rem;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.highlight-card {
  background: var(--navy-light);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 24px;
  transition: all var(--transition);
}

.highlight-card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  transform: translateY(-2px);
}

.highlight-icon {
  color: var(--blue-accent);
  margin-bottom: 12px;
}

.highlight-card h3 {
  font-size: 1rem;
  color: var(--white);
  margin-bottom: 6px;
  font-weight: 600;
}

.highlight-card p {
  font-size: 0.875rem;
  color: var(--gray-400);
}

/* ============================================
   Expertise
   ============================================ */
.expertise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.expertise-category {
  background: var(--navy);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 28px;
}

.expertise-category h3 {
  font-size: 0.95rem;
  color: var(--white);
  margin-bottom: 16px;
  font-weight: 600;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 6px 14px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--gray-300);
  font-family: var(--font-mono);
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: rgba(37, 99, 235, 0.2);
}

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

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

.timeline-marker {
  position: absolute;
  left: -32px;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--navy);
  border: 2px solid var(--blue-accent);
  z-index: 1;
}

.timeline-item:first-child .timeline-marker {
  background: var(--blue-accent);
  box-shadow: 0 0 12px rgba(37, 99, 235, 0.4);
}

.timeline-content {
  background: var(--navy-light);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 28px;
  transition: border-color var(--transition);
}

.timeline-content:hover {
  border-color: rgba(37, 99, 235, 0.2);
}

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

.timeline-header h3 {
  font-size: 1.1rem;
  color: var(--white);
  font-weight: 600;
}

.timeline-company {
  font-size: 0.875rem;
  color: var(--gray-400);
  margin-top: 4px;
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--blue-accent);
  white-space: nowrap;
  flex-shrink: 0;
}

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

.timeline-details li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--gray-300);
}

.timeline-details li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--blue-accent);
}

/* ============================================
   Education
   ============================================ */
.education-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.education-card {
  background: var(--navy);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 28px;
}

.education-card h3 {
  font-size: 1.1rem;
  color: var(--white);
  font-weight: 600;
  margin-bottom: 6px;
}

.education-detail {
  color: var(--gray-300);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.education-meta {
  font-size: 0.8rem;
  color: var(--gray-500);
  font-family: var(--font-mono);
}

/* ============================================
   Blog
   ============================================ */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.blog-card {
  background: var(--navy-light);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 28px;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  border-color: rgba(37, 99, 235, 0.3);
  transform: translateY(-3px);
}

.blog-card-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--blue-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.blog-card h3 {
  font-size: 1.05rem;
  color: var(--white);
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.4;
}

.blog-card h3 a {
  color: var(--white);
}

.blog-card h3 a:hover {
  color: var(--blue-accent);
}

.blog-card p {
  font-size: 0.875rem;
  color: var(--gray-400);
  flex-grow: 1;
  margin-bottom: 16px;
}

.blog-card-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--gray-500);
  font-family: var(--font-mono);
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.blog-cta {
  text-align: center;
  margin-top: 40px;
}

/* ============================================
   Contact
   ============================================ */
.contact-grid {
  max-width: 600px;
}

.contact-info p {
  font-size: 1.05rem;
  color: var(--gray-300);
  margin-bottom: 32px;
}

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

.contact-link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--gray-300);
  font-size: 0.95rem;
  transition: color var(--transition);
}

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

.contact-link svg {
  flex-shrink: 0;
  color: var(--blue-accent);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 32px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.footer-content {
  text-align: center;
  font-size: 0.8rem;
  color: var(--gray-500);
}

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(10, 22, 40, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  .hero-metrics {
    gap: 24px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .expertise-grid {
    grid-template-columns: 1fr;
  }

  .blog-grid {
    grid-template-columns: 1fr;
  }

  .education-grid {
    grid-template-columns: 1fr;
  }

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

  .timeline-date {
    order: -1;
  }
}

/* ============================================
   Blog Post Page Styles
   ============================================ */
.blog-post {
  padding-top: 120px;
  padding-bottom: 80px;
}

.blog-post-header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.blog-post-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--blue-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.blog-post-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--white);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.blog-post-meta {
  font-size: 0.85rem;
  color: var(--gray-500);
  font-family: var(--font-mono);
}

.blog-post-content {
  max-width: 720px;
}

.blog-post-content h2 {
  font-size: 1.5rem;
  color: var(--white);
  font-weight: 600;
  margin: 48px 0 16px;
}

.blog-post-content h3 {
  font-size: 1.15rem;
  color: var(--white);
  font-weight: 600;
  margin: 32px 0 12px;
}

.blog-post-content p {
  margin-bottom: 20px;
  color: var(--gray-300);
  font-size: 1.05rem;
  line-height: 1.8;
}

.blog-post-content ul,
.blog-post-content ol {
  margin-bottom: 20px;
  padding-left: 20px;
}

.blog-post-content li {
  margin-bottom: 8px;
  color: var(--gray-300);
  font-size: 1rem;
  position: relative;
  padding-left: 16px;
}

.blog-post-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--blue-accent);
}

.blog-post-content blockquote {
  border-left: 3px solid var(--blue-accent);
  padding: 16px 24px;
  margin: 24px 0;
  background: rgba(37, 99, 235, 0.05);
  border-radius: 0 8px 8px 0;
}

.blog-post-content blockquote p {
  color: var(--gray-200);
  font-style: italic;
  margin-bottom: 0;
}

.blog-post-content code {
  font-family: var(--font-mono);
  background: rgba(37, 99, 235, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--blue-glow);
}

.blog-post-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--gray-400);
  font-size: 0.875rem;
  margin-bottom: 32px;
  transition: color var(--transition);
}

.blog-post-back:hover {
  color: var(--blue-accent);
}

/* Blog listing page */
.blog-listing {
  padding-top: 120px;
  padding-bottom: 80px;
}

.blog-listing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 720px;
}

.blog-listing-item {
  display: block;
  background: var(--navy-light);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 24px 28px;
  transition: all var(--transition);
}

.blog-listing-item:hover {
  border-color: rgba(37, 99, 235, 0.3);
  transform: translateX(4px);
  color: inherit;
}

.blog-listing-item h3 {
  font-size: 1.1rem;
  color: var(--white);
  font-weight: 600;
  margin-bottom: 8px;
}

.blog-listing-item p {
  font-size: 0.875rem;
  color: var(--gray-400);
  margin-bottom: 12px;
}

.blog-listing-meta {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--gray-500);
  font-family: var(--font-mono);
}