/* Style 1: Modern Tech Professional */
/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --accent-color: #10b981;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --bg-color: #ffffff;
  --bg-light: #f9fafb;
  --border-color: #e5e7eb;
  --max-width: 1200px;
  --font-serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header */
.site-header {
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

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

.site-logo {
  text-decoration: none;
  color: var(--text-color);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-image {
  height: 48px;
  width: auto;
}

.book-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: color 0.2s;
}

.main-nav a:hover {
  color: var(--primary-color);
}

/* Main Content */
main {
  min-height: calc(100vh - 200px);
}

.page-content {
  padding: 4rem 0;
}

/* Content pages (non-blog): editorial typography.
   The :has() guards keep every rule out of the blog, which owns its styles. */
.page-content:not(:has(.blog-list, .blog-post)) h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 2.75rem;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin-bottom: 2rem;
  color: var(--text-color);
}

.page-content:not(:has(.blog-list, .blog-post)) h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 2rem;
  letter-spacing: -0.01em;
  line-height: 1.2;
  margin-top: 3rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.page-content:not(:has(.blog-list, .blog-post)) h3 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.3rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

.page-content:not(:has(.blog-list, .blog-post)) p {
  margin-bottom: 1.5rem;
  color: #374151;
  font-size: 1.125rem;
  line-height: 1.75;
}

.page-content:not(:has(.blog-list, .blog-post)) ul,
.page-content:not(:has(.blog-list, .blog-post)) ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
  color: #374151;
}

.page-content:not(:has(.blog-list, .blog-post)) li {
  margin-bottom: 0.5rem;
}

.page-content:not(:has(.blog-list, .blog-post)) a:not(.btn) {
  color: var(--primary-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Text-only pages get a narrow reading measure; the home grid stays wide */
.page-content:not(:has(.blog-list, .blog-post, .features-grid)) > .container {
  max-width: 820px;
}

.page-content:has(.features-grid) > .container > p,
.page-content:has(.features-grid) > .container > ul {
  max-width: 760px;
}

/* Hero Section */
.hero {
  background: linear-gradient(160deg, #1e3a8a 0%, #172e6b 100%);
  color: white;
  padding: 7rem 0;
  text-align: center;
}

.hero h1 {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.5rem, 6vw, 3.75rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: 1.25rem;
  color: white;
}

.hero .subtitle {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

.hero .description {
  font-size: 1.25rem;
  max-width: 800px;
  margin: 0 auto 3rem;
  opacity: 0.9;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.9rem 1.9rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  border-radius: 0.4rem;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}

.btn-secondary {
  background-color: transparent;
  color: white;
  border: 2px solid white;
}

.btn-secondary:hover {
  background-color: white;
  color: var(--primary-color);
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* CTA Section */
.cta-section {
  background-color: var(--bg-light);
  padding: 4rem 2rem;
  text-align: center;
  margin: 4rem 0;
  border-radius: 1rem;
}

.cta-section h2 {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 2rem;
  letter-spacing: -0.01em;
  margin-bottom: 2rem;
}

.cta-section .btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.cta-section .btn-secondary {
  background-color: white;
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.cta-section .btn-secondary:hover {
  background-color: var(--primary-color);
  color: white;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: 3rem 0;
}

@media (max-width: 768px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
}

.feature {
  padding: 2rem;
  background-color: var(--bg-light);
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
}

.page-content .feature h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  color: var(--primary-color);
}

/* ==========================================================================
   Blog — editorial style
   ========================================================================== */
:root {
  --blog-serif: var(--font-serif);
  --blog-sans: var(--font-sans);
  --blog-ink: #1f2937;     /* headline / strong text */
  --blog-body: #374151;    /* body copy */
  --blog-muted: #6b7280;   /* meta / captions */
  --blog-accent: var(--primary-color);      /* brand blue */
  --blog-accent-dark: var(--secondary-color);
  --blog-rule: var(--border-color);         /* hairlines */
  --blog-panel: #f3f4f6;   /* table head / code bg */
  --blog-read: 720px;      /* reading column */
}

/* --- Listing page header ("Blog" / "Latest Posts") --- */
.page-content:has(.blog-list) {
  max-width: var(--blog-read);
  margin: 0 auto;
}

.page-content:has(.blog-list) > .container {
  padding-left: 0;
  padding-right: 0;
}

.page-content:has(.blog-list) h1 {
  font-family: var(--blog-serif);
  font-weight: 400;
  letter-spacing: -0.015em;
  color: var(--blog-ink);
  margin-bottom: 0.5rem;
}

.page-content:has(.blog-list) h2 {
  font-family: var(--blog-sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blog-muted);
  margin: 0 0 0.5rem 0;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--blog-rule);
}

/* --- Post listing --- */
.blog-list {
  max-width: var(--blog-read);
  margin: 0 auto;
  background: transparent;
  padding: 0;
  border-radius: 0;
  box-shadow: none;
}

.blog-preview {
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--blog-rule);
}

.blog-preview:last-child {
  border-bottom: none;
}

.blog-preview-title {
  margin: 0 0 0.55rem 0;
  font-family: var(--blog-serif);
  font-size: 1.9rem;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.blog-preview-title a {
  color: var(--blog-ink);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.blog-preview-meta {
  color: var(--blog-muted);
  font-family: var(--blog-sans);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  margin-bottom: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.blog-preview-author {
  margin-left: 0;
}

.blog-preview-excerpt {
  color: var(--blog-body);
  font-family: var(--blog-sans);
  margin-bottom: 1rem;
  font-size: 1.05rem;
  line-height: 1.65;
}

.read-more {
  color: var(--blog-accent);
  font-family: var(--blog-sans);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.read-more:hover {
  border-bottom-color: var(--blog-accent);
}

/* --- Single post --- */
.blog-post {
  max-width: var(--blog-read);
  margin: 0 auto;
  background: transparent;
  padding: 0;
  border-radius: 0;
  box-shadow: none;
}

.post-header {
  margin-bottom: 2.75rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--blog-rule);
}

.post-title {
  margin: 0 0 1.1rem 0;
  font-family: var(--blog-serif);
  font-weight: 400;
  font-size: clamp(2.2rem, 5vw, 3.1rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--blog-ink);
}

.post-meta {
  color: var(--blog-muted);
  font-family: var(--blog-sans);
  font-size: 0.76rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.post-author {
  margin-left: 0;
}

.post-content {
  font-family: var(--blog-sans);
  font-size: 1.15rem;
  line-height: 1.75;
  color: var(--blog-body);
}

.post-content h2 {
  font-family: var(--blog-serif);
  font-weight: 500;
  font-size: 1.75rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 2.75rem 0 1rem 0;
  color: var(--blog-ink);
}

.post-content h3 {
  font-family: var(--blog-sans);
  font-weight: 600;
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem 0;
  color: var(--blog-ink);
}

.post-content p {
  margin-bottom: 1.5rem;
}

.post-content a {
  color: var(--blog-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  transition: color 0.2s ease;
}

.post-content a:hover {
  color: var(--blog-accent-dark);
  text-decoration-thickness: 2px;
}

.post-content ul,
.post-content ol {
  margin: 0 0 1.5rem 0;
  padding-left: 1.4rem;
}

.post-content li {
  margin-bottom: 0.6rem;
}

.post-content blockquote {
  margin: 2rem 0;
  padding: 0.25rem 0 0.25rem 1.5rem;
  border-left: 3px solid var(--blog-accent);
  font-family: var(--blog-serif);
  font-size: 1.35rem;
  font-style: italic;
  line-height: 1.4;
  color: var(--blog-ink);
}

.post-content img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  margin: 2rem 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.98rem;
}

.post-content th,
.post-content td {
  border: 1px solid var(--blog-rule);
  padding: 0.6rem 0.85rem;
  text-align: left;
  vertical-align: top;
}

.post-content th {
  background-color: var(--blog-panel);
  font-weight: 600;
  color: var(--blog-ink);
}

.post-content tbody tr:nth-child(even) {
  background-color: #fafbfa;
}

.post-content code {
  background-color: var(--blog-panel);
  padding: 0.15rem 0.4rem;
  border-radius: 0.25rem;
  font-family: ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, monospace;
  font-size: 0.85em;
}

.post-content pre {
  background-color: #1e293b;
  color: #e2e8f0;
  padding: 1.15rem 1.25rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 1.75rem 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.post-content pre code {
  background-color: transparent;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.post-footer {
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--blog-rule);
}

.post-footer .btn {
  background: transparent;
  color: var(--blog-accent);
  font-family: var(--blog-sans);
  font-weight: 600;
  font-size: 1rem;
  padding: 0;
  border-radius: 0;
}

.post-footer .btn:hover {
  color: var(--blog-accent-dark);
  transform: none;
  box-shadow: none;
}

@media (max-width: 768px) {
  .post-content {
    font-size: 1.08rem;
  }

  .post-content table {
    display: block;
    overflow-x: auto;
  }
}

/* Author Headshot */
.author-headshot {
  float: right;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 0 1.5rem 2rem;
  border: 4px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Footer */
.site-footer {
  background-color: var(--bg-light);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0;
  margin-top: 4rem;
  text-align: center;
}

.footer-content p {
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero .subtitle {
    font-size: 1.25rem;
  }

  .page-content h1 {
    font-size: 2rem;
  }

  .cta-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .author-headshot {
    float: none;
    display: block;
    margin: 0 auto 2rem auto;
  }
}