/* ============================================================
   LetPrompt Blog — Stylesheet
   Brand: LetPrompt | Primary: #0D6EFD | Accent: #0DCAF0
   ============================================================ */

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

:root {
  --primary: #0D6EFD;
  --primary-dark: #0A58CA;
  --primary-light: #E7F1FF;
  --secondary: #6C757D;
  --accent: #0DCAF0;
  --accent-dark: #0AA2C0;
  --dark: #1A1A2E;
  --dark-soft: #2D2D44;
  --light: #F8F9FA;
  --gray-100: #F0F2F5;
  --gray-200: #E0E3E8;
  --gray-300: #C4C9D0;
  --gray-600: #6C757D;
  --gray-800: #343A40;
  --white: #FFFFFF;
  --body-font: 'Inter', system-ui, -apple-system, sans-serif;
  --heading-font: 'Inter', system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
  --content-width: 720px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --transition: 200ms ease;
}

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

body {
  font-family: var(--body-font);
  color: var(--gray-800);
  background: var(--light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--primary-dark);
}

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

/* --- Navbar --- */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.95);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--primary);
  text-decoration: none;
}

.navbar-brand img {
  height: 32px;
  width: auto;
}

.navbar-brand:hover {
  color: var(--primary-dark);
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.navbar-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--gray-600);
  letter-spacing: 0.01em;
  transition: color var(--transition);
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--primary);
}

.cta-link {
  background: var(--primary);
  color: var(--white) !important;
  padding: 8px 20px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.85rem;
  transition: background var(--transition), transform var(--transition);
}

.cta-link:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* --- Blog Hero --- */
.blog-hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-soft) 50%, var(--primary)) 100%;
  padding: 80px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.blog-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(13,110,253,0.15) 0%, transparent 70%);
  border-radius: 50%;
}

.blog-hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(13,202,240,0.1) 0%, transparent 70%);
  border-radius: 50%;
}

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

.blog-hero h1 {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 2.8rem;
  color: var(--white);
  margin-bottom: 16px;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.blog-hero p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin: 0 auto 24px;
  line-height: 1.6;
}

.blog-hero .hero-cta {
  display: inline-block;
  background: var(--accent);
  color: var(--dark);
  padding: 12px 32px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background var(--transition), transform var(--transition);
}

.blog-hero .hero-cta:hover {
  background: var(--accent-dark);
  transform: translateY(-2px);
  color: var(--dark);
}

/* --- Blog Grid --- */
.blog-section {
  padding: 60px 0;
}

.blog-section h2 {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.blog-section .section-subtitle {
  color: var(--gray-600);
  font-size: 1.05rem;
  margin-bottom: 40px;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 28px;
}

.blog-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.blog-card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background: var(--gray-100);
}

.blog-card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-card-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 12px;
  width: fit-content;
}

.blog-card h3 {
  font-family: var(--heading-font);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--dark);
  margin-bottom: 10px;
  line-height: 1.4;
}

.blog-card h3 a {
  color: inherit;
  text-decoration: none;
}

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

.blog-card p {
  font-size: 0.92rem;
  color: var(--gray-600);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
}

.blog-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.82rem;
  color: var(--gray-600);
  padding-top: 12px;
  border-top: 1px solid var(--gray-100);
}

.blog-card-meta .date {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- Newsletter Section --- */
.newsletter-section {
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  padding: 60px 0;
}

.newsletter-box {
  max-width: 540px;
  margin: 0 auto;
  text-align: center;
}

.newsletter-box h2 {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--dark);
  margin-bottom: 12px;
}

.newsletter-box p {
  color: var(--gray-600);
  margin-bottom: 28px;
  font-size: 1rem;
}

.newsletter-form {
  display: flex;
  gap: 10px;
  max-width: 460px;
  margin: 0 auto;
}

.newsletter-form input {
  flex: 1;
  padding: 12px 18px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-family: var(--body-font);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition);
}

.newsletter-form input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13,110,253,0.1);
}

.newsletter-form button {
  padding: 12px 28px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--body-font);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  white-space: nowrap;
}

.newsletter-form button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

/* --- Footer --- */
.blog-footer {
  background: var(--dark);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 32px;
}

.blog-footer .container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
}

.blog-footer-brand img {
  height: 28px;
  margin-bottom: 12px;
}

.blog-footer-brand p {
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 300px;
}

.blog-footer h4 {
  color: var(--white);
  font-family: var(--heading-font);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.blog-footer ul {
  list-style: none;
}

.blog-footer ul li {
  margin-bottom: 10px;
}

.blog-footer ul a {
  color: rgba(255,255,255,0.6);
  font-size: 0.88rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 32px;
  padding-top: 24px;
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

/* --- Article Page --- */
.article-page {
  background: var(--white);
}

.article-header {
  background: var(--light);
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--gray-200);
}

.article-header .container {
  max-width: var(--content-width);
}

.article-category {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 14px;
  border-radius: 100px;
  margin-bottom: 16px;
}

.article-header h1 {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 2.2rem;
  color: var(--dark);
  margin-bottom: 16px;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.article-header .article-excerpt {
  font-size: 1.1rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-header .article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--gray-600);
  flex-wrap: wrap;
}

.article-header .article-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.article-featured-image {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

.article-featured-image img {
  width: 100%;
  border-radius: var(--radius);
  margin: 32px 0;
  box-shadow: var(--shadow);
}

.article-featured-image .image-caption {
  font-size: 0.82rem;
  color: var(--gray-600);
  text-align: center;
  margin-top: -24px;
  margin-bottom: 32px;
}

/* --- Article Content --- */
.article-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.article-content h2 {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.6rem;
  color: var(--dark);
  margin: 40px 0 16px;
  line-height: 1.3;
}

.article-content h3 {
  font-family: var(--heading-font);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--dark);
  margin: 28px 0 12px;
  line-height: 1.4;
}

.article-content p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--gray-800);
  margin-bottom: 20px;
}

.article-content ul,
.article-content ol {
  margin: 0 0 20px 24px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--gray-800);
}

.article-content li {
  margin-bottom: 8px;
}

.article-content strong {
  color: var(--dark);
  font-weight: 600;
}

.article-content blockquote {
  border-left: 4px solid var(--primary);
  padding: 16px 24px;
  margin: 24px 0;
  background: var(--primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--gray-800);
}

.article-content a {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.article-content a:hover {
  color: var(--primary-dark);
}

/* --- Table --- */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.95rem;
}

.article-content th {
  background: var(--primary);
  color: var(--white);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
}

.article-content td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--gray-200);
}

.article-content tr:nth-child(even) td {
  background: var(--gray-100);
}

/* CTA Box */
.article-cta {
  background: linear-gradient(135deg, var(--primary-light), var(--white));
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

.article-cta h3 {
  font-family: var(--heading-font);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--dark);
  margin-bottom: 10px;
}

.article-cta p {
  color: var(--gray-600);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.article-cta .cta-button {
  display: inline-block;
  background: var(--primary);
  color: var(--white);
  padding: 12px 32px;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background var(--transition), transform var(--transition);
}

.article-cta .cta-button:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  color: var(--white);
  text-decoration: none;
}

/* Schema Notice (hidden) */
.schema-markup {
  display: none;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .navbar .container {
    height: 60px;
  }

  .navbar-links {
    gap: 16px;
  }

  .navbar-links a {
    font-size: 0.82rem;
  }

  .blog-hero {
    padding: 60px 0 40px;
  }

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

  .blog-hero p {
    font-size: 1rem;
  }

  .blog-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .article-header h1 {
    font-size: 1.6rem;
  }

  .article-content {
    padding: 0 16px 32px;
  }

  .article-content h2 {
    font-size: 1.35rem;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .blog-footer .container {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .blog-footer-brand p {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .navbar-links .link-label {
    display: none;
  }

  .blog-hero h1 {
    font-size: 1.6rem;
  }

  .blog-card h3 {
    font-size: 1.1rem;
  }
}

/* --- FAQ Schema Styling --- */
.faq-section {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 24px;
  margin: 32px 0;
}

.faq-item {
  border-bottom: 1px solid var(--gray-200);
  padding: 16px 0;
}

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

.faq-item h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--dark);
  margin: 0 0 8px 0;
}

.faq-item p {
  font-size: 0.95rem;
  margin: 0;
  color: var(--gray-600);
}

/* --- Prompt Snippet Box --- */
.prompt-box {
  background: var(--dark);
  color: #E0E3E8;
  border-radius: var(--radius-sm);
  padding: 20px;
  margin: 20px 0;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.88rem;
  line-height: 1.6;
  overflow-x: auto;
  position: relative;
}

.prompt-box::before {
  content: 'PROMPT';
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 0.65rem;
  font-family: var(--body-font);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.3);
}