:root {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f3f0;
  --color-text: #1e293b;
  --color-text-secondary: #475569;
  --color-accent: #6366f1;
  --color-accent-light: #e0e7ff;
  --color-border: #e2e8f0;
  --color-link: #4338ca;
  --color-link-hover: #6366f1;
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --max-width: 1100px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Header / Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-title a {
  color: inherit;
}

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

.site-title .title-credential {
  font-weight: 400;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 0.25rem;
}

nav a {
  display: block;
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: 6px;
  transition: background 0.2s ease, color 0.2s ease;
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-text);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* Hero */
.hero {
  padding: 2.7rem 2rem 2.2rem;
  text-align: center;
  background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-alt) 100%);
  border-bottom: 1px solid var(--color-border);
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  margin: 0 auto 1.25rem;
  border: 3px solid var(--color-surface);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.hero .tagline {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
  font-weight: 400;
}

.hero .social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero .social-links a {
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-secondary);
  transition: all 0.2s ease;
}

.hero .social-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

/* Page Header (non-home pages) */
.page-header {
  padding: 3.5rem 2rem 2.5rem;
  text-align: center;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.page-header .subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Main Content */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

/* Section */
.section {
  margin-bottom: 4rem;
}

.section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.section-intro {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  max-width: 720px;
}

/* Cards Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.card {
  display: block;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.75rem;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: box-shadow 0.2s ease, transform 0.15s ease;
}

.card:hover {
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.4;
  color: var(--color-text);
}

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

.card .card-meta {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.card .card-description {
  font-size: 0.92rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.card .card-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 500;
  background: var(--color-accent-light);
  color: var(--color-accent);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  margin-top: 0.75rem;
}

/* Featured Card (Book) */
.featured-card {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 2rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 3rem;
  align-items: center;
}

.featured-card img {
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.featured-card h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.featured-card p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border-radius: 8px;
  transition: background 0.2s ease, transform 0.15s ease;
}

.btn:hover {
  background: var(--color-link);
  color: #fff;
  transform: translateY(-1px);
}

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

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

/* List Items */
.item-list {
  list-style: none;
}

.item-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.6;
}

.item-list li:last-child {
  border-bottom: none;
}

.item-list .item-year {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-block;
  min-width: 3rem;
}

/* About Page */
.about-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3rem;
  align-items: start;
}

.about-photo {
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: calc(var(--header-height) + 2rem);
}

.about-text h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.about-text h2:first-child {
  margin-top: 0;
}

.about-text p {
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
}

.about-text ul {
  margin-bottom: 1rem;
  padding-left: 1.25rem;
}

.about-text li {
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
}

/* Experience Grid */
.experience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.experience-item {
  padding: 1.25rem;
  background: var(--color-surface-alt);
  border-radius: 8px;
}

.experience-item h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.experience-item .org {
  font-style: italic;
  color: var(--color-text-secondary);
  font-size: 0.92rem;
}

.experience-item .dates {
  font-size: 0.82rem;
  color: var(--color-accent);
  font-weight: 500;
}

/* Book Page */
.book-hero {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 3rem;
  padding: 3rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  align-items: center;
}

.book-cover {
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.book-info h2 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.book-info .publisher {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
}

.book-info p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.book-info .buy-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

/* Pullquote */
.pullquote {
  border-left: 4px solid var(--color-accent);
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  background: var(--color-surface-alt);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--color-text-secondary);
}

.pullquote cite {
  display: block;
  margin-top: 0.75rem;
  font-style: normal;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text);
}

/* Collapsible Sections */
details {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-bottom: 1rem;
}

details summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

details summary::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: transform 0.2s ease;
}

details[open] summary::after {
  content: '\2212';
}

details summary::-webkit-details-marker {
  display: none;
}

details .details-content {
  padding: 0 1.25rem 1.25rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 2rem;
  text-align: center;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  background: var(--color-surface);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
}

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

/* Blog Post Content */
.post-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text);
}

.post-content p {
  margin-bottom: 1.25rem;
}

.post-content h2, .post-content h3 {
  font-family: var(--font-serif);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.post-content h2 { font-size: 1.5rem; }
.post-content h3 { font-size: 1.25rem; }

.post-content ul, .post-content ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.post-content li {
  margin-bottom: 0.5rem;
}

.post-content blockquote {
  border-left: 4px solid var(--color-accent);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--color-surface-alt);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.post-content img {
  border-radius: 8px;
  margin: 1.5rem 0;
}

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

.post-content a:hover {
  text-decoration-color: var(--color-accent);
}

/* WordPress alignment classes */
.post-content .alignright {
  float: right;
  max-width: 50%;
  margin: 0.25rem 0 1rem 1.5rem;
}

.post-content .alignleft {
  float: left;
  max-width: 50%;
  margin: 0.25rem 1.5rem 1rem 0;
}

.post-content .aligncenter {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.post-content figure {
  margin: 0 0 1.25rem;
}

.post-content figure img {
  margin: 0;
}

.post-content figcaption {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-top: 0.4rem;
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

/* Floating Callout (WordPress block) */
.wp-block-floating-callout-wrapper.right {
  float: right;
  width: 45%;
  margin: 0.25rem 0 1rem 1.5rem;
  padding: 1.25rem;
  background: var(--color-surface-alt);
  border-radius: 12px;
  border-left: 4px solid var(--color-accent);
}

.wp-block-floating-callout-wrapper h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.wp-block-floating-callout-wrapper p {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }

  .hero {
    padding: 2rem 1.5rem 1.75rem;
  }

  .hero-photo {
    width: 100px;
    height: 100px;
  }

  .page-header h1 {
    font-size: 1.75rem;
  }

  .main-content {
    padding: 2rem 1.5rem 3rem;
  }

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

  .featured-card {
    grid-template-columns: 120px 1fr;
    gap: 1.25rem;
    padding: 1.25rem;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .about-photo {
    max-width: 240px;
    margin: 0 auto;
    position: static;
  }

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

  .book-hero {
    grid-template-columns: 160px 1fr;
    gap: 1.5rem;
    padding: 2rem 1.5rem;
  }

  .nav-toggle {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  }

  nav.open {
    display: block;
  }

  nav ul {
    flex-direction: column;
    gap: 0.25rem;
  }

  nav a {
    padding: 0.75rem 1rem;
  }

  .wp-block-floating-callout-wrapper.right {
    float: none;
    width: 100%;
    margin-left: 0;
  }

  .post-content .alignright,
  .post-content .alignleft {
    float: none;
    max-width: 100%;
    margin: 1rem 0;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .book-hero {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .book-cover {
    max-width: 180px;
    margin: 0 auto;
  }

  .featured-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .featured-card img {
    max-width: 140px;
    margin: 0 auto;
  }
}