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

:root {
  --bg: #F9FBFE;
  --bg-warm: #F0F4FA;
  --text: #1a1a1a;
  --text-secondary: #555;
  --text-light: #888;
  --accent: #5B8DB8;
  --accent-hover: #4A7A9E;
  --border: #dce4ed;
  --card-bg: #fff;
  --nav-bg: rgba(249, 251, 254, 0.92);
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

ul {
  list-style: none;
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ========================================
   Navigation
   ======================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

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

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

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

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  letter-spacing: 0.01em;
}

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

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

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s ease;
  border-radius: 1px;
}

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

.hero-grain {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(91, 141, 184, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(74, 122, 158, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  padding-top: 80px;
}

.hero-greeting {
  font-size: 1.125rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}

.hero-name {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 600px;
  margin-bottom: 40px;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all 0.2s ease;
  letter-spacing: 0.01em;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  border: 1.5px solid var(--border);
  color: var(--text);
}

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

/* ========================================
   Sections
   ======================================== */
.section {
  padding: 120px 0;
}

.section-label {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  margin-bottom: 48px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 72px;
  margin-bottom: 32px;
}

.section-intro {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 600px;
}

/* ========================================
   Story (About)
   ======================================== */
.story-content {
  max-width: 720px;
}

.story-text p {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  line-height: 1.8;
}

.story-human {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.125rem !important;
  color: var(--text) !important;
}

/* ========================================
   Expertise Cards
   ======================================== */
.expertise {
  background: var(--bg-warm);
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.expertise-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 36px;
  transition: all 0.3s ease;
}

.expertise-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.expertise-icon {
  color: var(--accent);
  margin-bottom: 20px;
}

.expertise-card h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.expertise-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.expertise-signature {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--accent);
  display: block;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ========================================
   Timeline
   ======================================== */
.timeline {
  position: relative;
  padding-left: 40px;
}

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

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

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

.timeline-marker {
  position: absolute;
  left: -40px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent);
}

.timeline-location {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
  margin-bottom: 8px;
}

.timeline-date {
  font-size: 0.8125rem;
  color: var(--text-light);
  font-weight: 500;
}

.timeline-content h4 {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 4px;
}

.timeline-company {
  font-size: 0.9375rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 12px;
}

.timeline-company a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

.timeline-company a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.timeline-content ul {
  list-style: disc;
  padding-left: 20px;
}

.timeline-content li {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  line-height: 1.6;
}

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

.education-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px;
}

.education-card h4 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.education-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.education-year {
  font-size: 0.8125rem;
  color: var(--text-light);
  font-weight: 500;
}

/* ========================================
   Projects
   ======================================== */
.projects {
  background: var(--bg-warm);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.project-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.project-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.project-year {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-light);
}

.project-card a.project-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 12px;
  transition: color 0.2s ease;
}

.project-card a.project-link:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.project-card h4 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.project-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tags span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-light);
  background: var(--bg);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

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

.writing-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: all 0.3s ease;
  display: block;
}

.writing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.writing-card-link {
  cursor: pointer;
}

.writing-card-link:hover h4 {
  color: var(--accent);
}

.writing-category {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 12px;
  display: block;
}

.writing-card h4 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 10px;
  transition: color 0.2s ease;
}

.writing-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.writing-status {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.writing-date {
  font-size: 0.8125rem;
  color: var(--text-light);
  font-weight: 500;
}

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

/* ========================================
   Interests
   ======================================== */
.interests {
  background: var(--bg-warm);
}

.interests-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.interest-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
  transition: all 0.3s ease;
}

.interest-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.interest-icon {
  color: var(--accent);
  margin-bottom: 16px;
  display: flex;
  justify-content: center;
}

.interest-card h4 {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.interest-card p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.interest-card-link {
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.interest-card-link:hover h4 {
  color: var(--accent);
}

.interest-tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  margin-top: 12px;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.interest-card-link:hover .interest-tag {
  opacity: 1;
}

/* ========================================
   Connect
   ======================================== */
.connect {
  text-align: center;
}

.connect-content {
  max-width: 600px;
}

.connect-title {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
}

.connect-text {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.8;
}

.connect-links {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.connect-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border: 1.5px solid var(--border);
  border-radius: 6px;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

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

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  font-size: 0.8125rem;
  color: var(--text-light);
}

/* ========================================
   Animations
   ======================================== */
.fade-in-up {
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
}

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

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

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Certifications
   ======================================== */
.certification-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px;
}

.certification-card h4 {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.certification-card h4 a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
  transition: color 0.2s ease;
}

.certification-card h4 a:hover {
  color: var(--accent-hover);
}

.certification-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.certification-status {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent);
}

.certification-status.completed {
  color: var(--text-light);
}

/* ========================================
   Blog Listing Page
   ======================================== */
.blog-listing {
  padding: 160px 0 120px;
}

.blog-tabs {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.blog-tab {
  padding: 12px 30px;
  border: 1.5px solid var(--border);
  border-radius: 32px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-warm);
  cursor: pointer;
  transition: all 0.25s ease;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.04);
}

.blog-tab:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--card-bg);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(91, 141, 184, 0.15);
}

.blog-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 6px 20px rgba(91, 141, 184, 0.3);
  transform: translateY(-1px);
}

/* Blog simple list */
.blog-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.blog-list-item {
  border-bottom: 1px solid var(--border);
}

.blog-list-item:first-child {
  border-top: 1px solid var(--border);
}

.blog-list-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 28px 0;
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

.blog-list-link:hover .blog-list-title {
  color: var(--accent);
}

.blog-list-title {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--text);
  transition: color 0.2s ease;
}

.blog-list-date {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--accent);
  white-space: nowrap;
  margin-left: 48px;
}

/* Blog empty state */
.blog-empty {
  display: none;
  text-align: center;
  padding: 80px 0;
}

.blog-empty p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.blog-empty .blog-empty-sub {
  font-size: 0.9375rem;
  color: var(--text-light);
}

/* ========================================
   Blog Post Page
   ======================================== */
.blog-post-page {
  padding: 140px 0 120px;
}

.blog-post-header {
  max-width: 720px;
  margin-bottom: 48px;
}

.blog-back-link {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-light);
  margin-bottom: 24px;
  transition: color 0.2s ease;
}

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

.blog-post-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.blog-post-meta {
  font-size: 0.9375rem;
  color: var(--text-light);
  margin-bottom: 16px;
}

.blog-post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tags-item {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-light);
  background: var(--bg-warm);
  padding: 4px 10px;
  border-radius: 20px;
  border: 1px solid var(--border);
}

/* ========================================
   Prose (Blog Post Body)
   ======================================== */
.prose {
  max-width: 720px;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 48px;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.prose h3 {
  font-family: var(--font-serif);
  font-size: 1.375rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 36px;
  margin-bottom: 12px;
}

.prose h4 {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  margin-top: 28px;
  margin-bottom: 8px;
}

.prose p {
  margin-bottom: 20px;
}

.prose a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.prose strong {
  color: var(--text);
  font-weight: 600;
}

.prose em {
  font-style: italic;
}

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 20px;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 20px;
  margin: 28px 0;
  font-style: italic;
  color: var(--text);
}

.prose code {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.875em;
  background: var(--bg-warm);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.prose pre {
  background: #1a1a1a;
  color: #e5e5e5;
  padding: 24px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 28px 0;
  line-height: 1.5;
}

.prose pre code {
  background: none;
  padding: 0;
  border: none;
  border-radius: 0;
  font-size: 0.875rem;
  color: inherit;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

.prose img {
  border-radius: 8px;
  margin: 28px 0;
}

/* ========================================
   Mobile Responsive
   ======================================== */
@media (max-width: 1024px) {
  .interests-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding: 80px 0;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 32px;
  }

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

  .nav-links a {
    font-size: 1.125rem;
  }

  .nav-toggle {
    display: flex;
  }

  .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);
  }

  .hide-mobile {
    display: none;
  }

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

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

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

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

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

  .timeline {
    padding-left: 32px;
  }

  .blog-listing {
    padding: 120px 0 80px;
  }

  .blog-post-page {
    padding: 100px 0 80px;
  }
}

@media (max-width: 480px) {
  .hero-ctas {
    flex-direction: column;
  }

  .btn {
    justify-content: center;
  }

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

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