:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #1a1a2e;
  --text-secondary: #4a4a68;
  --text-muted: #7c7c96;
  --accent: #0d9488;
  --accent-light: #ccfbf1;
  --white: #ffffff;
  --black: #1a1a2e;
}

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

body {
  font-family: "DM Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

nav {
  padding: 32px 0;
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}

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

.nav-left {
  display: flex;
  align-items: center;
  gap: 32px;
}

.logo {
  font-family: "Inter", sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  text-decoration: none;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.nav-cta {
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
  background: var(--accent);
  padding: 10px 22px;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.nav-cta:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.back-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 24px;
  transition: opacity 0.2s ease;
}

.back-link:hover {
  opacity: 0.7;
}

/* Blog listing page */
.blog-hero {
  padding: 60px 0 48px;
  opacity: 0;
  animation: fadeIn 0.6s ease 0.15s forwards;
}

.hero-eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.hero-eyebrow::before {
  content: "";
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--accent);
}

h1 {
  font-family: "Inter", sans-serif;
  font-size: clamp(36px, 6vw, 52px);
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  font-weight: 700;
  color: var(--text);
}

.blog-hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

.blog-list {
  padding: 0 0 80px;
  opacity: 0;
  animation: fadeIn 0.6s ease 0.3s forwards;
}

.blog-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 32px;
  margin-bottom: 16px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s ease;
}

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

.blog-card-series {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 10px;
}

.blog-card h2 {
  font-family: "Inter", sans-serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-bottom: 10px;
  color: var(--text);
  line-height: 1.3;
}

.blog-card p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Blog post page */
.blog-post-header {
  padding: 60px 0 40px;
  opacity: 0;
  animation: fadeIn 0.6s ease 0.15s forwards;
}

.blog-post-header h1 {
  font-size: clamp(32px, 5vw, 44px);
  margin-bottom: 16px;
}

.blog-post-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 24px;
}

.blog-post-meta {
  font-size: 13px;
  color: var(--text-muted);
  padding-bottom: 8px;
}

.divider {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 0;
}

.blog-post-content {
  padding: 48px 0 80px;
  opacity: 0;
  animation: fadeIn 0.6s ease 0.3s forwards;
}

.blog-post-content p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}

.blog-post-content h2 {
  font-family: "Inter", sans-serif;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-top: 48px;
  margin-bottom: 20px;
  color: var(--text);
}

.blog-post-content h3 {
  font-family: "Inter", sans-serif;
  font-size: 20px;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 12px;
  color: var(--text);
}

.blog-post-content strong {
  color: var(--text);
  font-weight: 600;
}

.blog-post-content em {
  font-style: italic;
}

.blog-post-content ul,
.blog-post-content ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.blog-post-content li {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

.blog-post-content blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 20px;
  margin: 32px 0;
  font-style: italic;
  color: var(--text-muted);
}

.series-nav {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 28px;
  margin-top: 48px;
}

.series-nav p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 0;
}

.series-nav a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(13, 148, 136, 0.4);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s ease;
}

.series-nav a:hover {
  text-decoration-color: var(--accent);
}

.blog-cta {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 40px;
  text-align: center;
  margin-top: 48px;
}

.blog-cta h3 {
  font-family: "Inter", sans-serif;
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
  margin-top: 0;
}

.blog-cta p {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 24px;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  background: var(--accent);
  padding: 14px 28px;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.hero-cta:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.hero-cta svg {
  width: 16px;
  height: 16px;
  transition: transform 0.2s ease;
}

.hero-cta:hover svg {
  transform: translateX(3px);
}

footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  nav .container {
    flex-wrap: wrap;
    gap: 12px;
  }
  .nav-left {
    gap: 16px;
  }
  .logo {
    font-size: 17px;
  }
  .nav-cta {
    font-size: 12px;
    padding: 8px 16px;
  }
  h1 {
    font-size: 28px;
  }
  .blog-hero {
    padding: 40px 0 32px;
  }
  .blog-post-header {
    padding: 40px 0 32px;
  }
  .blog-post-header h1 {
    font-size: 26px;
  }
  .blog-post-subtitle {
    font-size: 16px;
  }
  .blog-card {
    padding: 20px;
  }
  .blog-card h2 {
    font-size: 18px;
  }
  .blog-cta {
    padding: 28px 20px;
  }
  .blog-cta h3 {
    font-size: 20px;
  }
  .hero-cta {
    font-size: 14px;
    padding: 12px 20px;
  }
}