/* ==========================================================================
   Design System & Editorial Stylesheet (Prospect Blogs Bespoke CSS)
   ========================================================================== */

:root {
  /* Color Palette - Premium Editorial Warm Alabaster & Forest Green */
  --bg-base: hsl(40, 25%, 98%);
  --bg-surface: hsl(0, 0%, 100%);
  --bg-surface-elevated: hsl(40, 15%, 95%);
  --bg-dark: hsl(215, 25%, 10%); /* For footer and dark CTA sections */
  
  --text-primary: hsl(215, 25%, 12%);
  --text-secondary: hsl(215, 12%, 35%);
  --text-muted: hsl(215, 8%, 55%);
  --text-light: hsl(0, 0%, 100%);
  --text-light-secondary: hsl(215, 15%, 80%);
  
  --accent: hsl(155, 60%, 24%); /* Forest Green */
  --accent-hover: hsl(155, 70%, 18%);
  --accent-soft: hsla(155, 60%, 24%, 0.06);
  --accent-border: hsla(155, 60%, 24%, 0.15);
  
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.16);
  --border-light: rgba(255, 255, 255, 0.1);

  /* Typography */
  --font-sans: "Segoe UI", Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  /* Spacing & Layout */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2.25rem;
  --spacing-lg: 4.5rem;
  --spacing-xl: 7rem;
  --max-width: 1140px;
  
  /* Motion & Radius */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --border-radius: 8px;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.02);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.04);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-base);
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border: 3px solid var(--bg-base);
  border-radius: 6px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

body {
  background-color: var(--bg-base);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & CSS-only Nav Toggle */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251, 250, 248, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem var(--spacing-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.site-brand {
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  letter-spacing: -0.5px;
  transition: transform var(--transition-fast);
}

.site-brand:hover {
  transform: translateY(-1px);
}

.brand-text {
  color: var(--text-primary);
  font-family: var(--font-sans);
}

.brand-sub {
  color: var(--accent);
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 700;
  margin-left: 2px;
}

/* Hide checkbox and labels on desktop */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 101;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  margin: 5px 0;
  transition: all var(--transition-normal);
}

.site-nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.25rem 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-link.active {
  color: var(--text-primary);
}

/* Main Area */
.site-main {
  flex: 1;
}

/* Hero Section */
.hero-section {
  padding: var(--spacing-xl) var(--spacing-sm);
  background: radial-gradient(circle at top right, var(--bg-surface-elevated), transparent 60%);
  border-bottom: 1px solid var(--border);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  background-color: var(--accent-soft);
  border: 1px solid var(--accent-border);
  padding: 0.4rem 1rem;
  border-radius: 30px;
  display: inline-block;
  margin-bottom: 1.75rem;
  font-weight: 600;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5.5vw, 4.25rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-primary);
  letter-spacing: -1.5px;
  margin-bottom: 1.75rem;
}

.hero-title .highlight {
  font-style: italic;
  color: var(--accent);
}

.hero-lead {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  max-width: 680px;
  margin: 0 auto 2.5rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2rem;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--text-light);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(22, 60, 43, 0.15);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* Topical Pillars Grid */
.topical-pillars {
  padding: var(--spacing-lg) var(--spacing-sm);
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-surface);
}

.section-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 3.5rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.5vw, 2.5rem);
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.pillar-card {
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: 2.25rem 2rem;
  transition: all var(--transition-normal);
}

.pillar-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-border);
  box-shadow: var(--shadow-md);
  background-color: var(--bg-surface);
}

.pillar-icon {
  font-size: 2rem;
  margin-bottom: 1.25rem;
  display: inline-block;
}

.pillar-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.pillar-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* Latest Articles & Grid Layout */
.latest-articles {
  padding: var(--spacing-lg) var(--spacing-sm);
  background: var(--bg-base);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3.5rem;
}

.article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.card-image-link {
  display: block;
  overflow: hidden;
  aspect-ratio: 16/10;
  background-color: var(--bg-surface-elevated);
}

.card-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.article-card:hover .card-image {
  transform: scale(1.02);
}

.card-content {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  letter-spacing: 0.5px;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  line-height: 1.3;
  margin-bottom: 0.85rem;
}

.card-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.card-summary {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  margin-top: auto;
}

.read-more-link {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition-fast);
}

.read-more-link .arrow {
  margin-left: 0.35rem;
  transition: transform var(--transition-fast);
}

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

.read-more-link:hover .arrow {
  transform: translateX(4px);
}

.view-all-container {
  text-align: center;
}

/* Newsletter CTA */
.newsletter-cta {
  padding: var(--spacing-lg) var(--spacing-sm);
  background-color: var(--bg-dark);
  color: var(--text-light-secondary);
  border-top: 1px solid var(--border);
}

.cta-container {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.cta-content {
  max-width: 600px;
  margin: 0 auto;
}

.cta-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3vw, 2.25rem);
  color: var(--text-light);
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
}

.cta-desc {
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.cta-form-facade {
  display: flex;
  gap: 0.5rem;
  max-width: 500px;
  margin: 0 auto;
}

.cta-form-facade input[type="email"] {
  flex: 1;
  padding: 0.85rem 1.25rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-light);
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--text-light);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.cta-form-facade input[type="email"]::placeholder {
  color: var(--text-muted);
}

.cta-form-facade input[type="email"]:focus {
  outline: none;
  border-color: var(--accent);
  background-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 0 0 3px rgba(22, 60, 43, 0.4);
}

/* Single Page / Editorial Content Styling */
.page-article {
  padding-bottom: var(--spacing-lg);
}

.page-header {
  background: linear-gradient(180deg, var(--bg-surface-elevated), var(--bg-base));
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-lg) var(--spacing-sm);
  text-align: center;
}

.header-inner {
  max-width: 800px;
  margin: 0 auto;
}

.page-title {
  font-family: var(--font-serif);
  font-size: clamp(2.25rem, 4.5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -1px;
}

.page-description {
  font-size: clamp(1.05rem, 1.75vw, 1.25rem);
  color: var(--text-secondary);
  font-weight: 400;
  line-height: 1.5;
}

.post-category {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 1.5px;
  margin-bottom: 0.75rem;
}

.post-meta {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
}

.page-content-wrapper {
  max-width: 780px;
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-sm);
}

.featured-image-container {
  margin-bottom: 3rem;
  border-radius: var(--border-radius);
  overflow: hidden;
  aspect-ratio: 16/9;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.featured-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Rich Prose Typography */
.prose {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.75;
}

.prose p {
  margin-bottom: 1.75rem;
}

.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: var(--font-serif);
  color: var(--text-primary);
  margin-top: 3rem;
  margin-bottom: 1rem;
  font-weight: 700;
  line-height: 1.25;
}

.prose h1 { font-size: 2.25rem; }
.prose h2 { font-size: 1.75rem; margin-top: 3.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; }
.prose h3 { font-family: var(--font-sans); font-size: 1.25rem; margin-top: 2.5rem; font-weight: 700; }

.prose ul, .prose ol {
  margin-bottom: 2rem;
  padding-left: 1.5rem;
}

.prose li {
  margin-bottom: 0.75rem;
}

.prose li strong {
  color: var(--text-primary);
}

.prose blockquote {
  border-left: 3px solid var(--accent);
  background: var(--bg-surface-elevated);
  padding: 1.5rem 2rem;
  margin: 2.5rem 0;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.2rem;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  color: var(--text-primary);
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 3.5rem 0;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: var(--bg-surface-elevated);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  color: var(--accent);
  border: 1px solid var(--border);
}

.prose pre {
  background-color: hsl(215, 25%, 10%);
  color: #f8f8f2;
  padding: 1.25rem;
  border-radius: var(--border-radius);
  overflow-x: auto;
  margin-bottom: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.prose pre code {
  background-color: transparent;
  color: inherit;
  padding: 0;
  border: none;
  font-size: 0.9em;
}

.prose a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1.5px solid var(--accent-border);
  transition: all var(--transition-fast);
}

.prose a:hover {
  color: var(--accent-hover);
  border-bottom-color: var(--accent-hover);
  background-color: var(--accent-soft);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 2.5rem 0;
  font-size: 0.95rem;
}

.prose th, .prose td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.prose th {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  font-weight: 700;
  font-family: var(--font-sans);
}

.prose tr:hover td {
  background-color: var(--bg-surface-elevated);
}

/* Contact Form Facade Layout */
.contact-form-facade {
  margin-top: 3rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 2.5rem;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  text-align: left;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  background-color: var(--bg-surface);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-group textarea {
  resize: vertical;
}

/* Footer Section */
.site-footer {
  background-color: var(--bg-dark);
  color: var(--text-light-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: var(--spacing-lg) var(--spacing-sm) 2.5rem;
}

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

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2.5rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 2.5rem;
  margin-bottom: 2rem;
}

.footer-brand-wrap {
  max-width: 450px;
}

.footer-brand {
  font-size: 1.5rem;
  font-weight: 800;
  display: inline-block;
  color: var(--text-light);
  margin-bottom: 0.5rem;
}

.footer-tagline {
  font-size: 0.95rem;
  line-height: 1.5;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  color: var(--text-light-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.editorial-disclaimer {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Visually Hidden Utility for A11y */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Accessibility Focus States */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

/* Responsive & Mobile Menu Implementation */
@media (max-width: 768px) {
  .header-container {
    padding: 1rem;
  }
  
  /* Show hamburger button */
  .nav-toggle-label {
    display: block;
  }
  
  /* Hide nav menu by default on mobile */
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 0;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }
  
  .nav-link {
    width: 100%;
    text-align: center;
    padding: 1rem;
  }
  
  .nav-link::after {
    display: none;
  }
  
  /* When checkbox is checked, expand menu */
  .nav-toggle:checked ~ .site-nav {
    max-height: 300px;
    opacity: 1;
    pointer-events: auto;
  }
  
  /* Hamburger icon animations */
  .nav-toggle:checked ~ .nav-toggle-label .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  
  .nav-toggle:checked ~ .nav-toggle-label .hamburger-line:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle:checked ~ .nav-toggle-label .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .cta-form-facade {
    flex-direction: column;
    gap: 0.75rem;
  }
  
  .footer-top {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 1rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}