/* ============================================
   DESIGN TOKENS - CARBON/GREEN THEME
   ============================================ */
:root {
  --bg-primary: #0d0f0e;
  --bg-secondary: #141714;
  --bg-tertiary: #1c1f1d;
  --text-primary: #e8ebe9;
  --text-secondary: #9aa39b;
  --text-muted: #5e6860;
  --primary-neon: #1fad66;
  --primary-neon-glow: rgba(31, 173, 102, 0.2);
  --accent-cyan: #17854e;
  --accent-green: #1fad66;
  --accent-yellow: #d4903a;
  --accent-red: #e05252;
  --border-color: rgba(31, 173, 102, 0.14);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 24px rgba(31, 173, 102, 0.12);
  --radius: 8px;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --transition: all 0.3s ease;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-primary);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  margin: var(--spacing-lg) 0 var(--spacing-md);
}

h1 {
  font-size: clamp(28px, 8vw, 56px);
}

h2 {
  font-size: clamp(24px, 6vw, 40px);
}

h3 {
  font-size: clamp(20px, 5vw, 28px);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

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

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

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

main {
  display: flex;
  flex-direction: column;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13, 15, 14, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
}

.navbar {
  padding: var(--spacing-md) 0;
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.logo img {
  height: 40px;
  width: auto;
}

.nav-menu {
  display: none;
  list-style: none;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-tertiary);
  padding: var(--spacing-md);
  gap: var(--spacing-md);
}

.nav-menu.active {
  display: flex;
}

.nav-menu a {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  transition: var(--transition);
}

.nav-menu a:hover {
  color: var(--primary-neon);
  padding-left: var(--spacing-sm);
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  width: 28px;
  height: 24px;
}

.menu-toggle span {
  width: 100%;
  height: 3px;
  background: var(--text-primary);
  border-radius: var(--radius);
  transition: var(--transition);
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
    position: static;
    flex-direction: row;
    background: none;
    padding: 0;
  }

  .menu-toggle {
    display: none;
  }

  .nav-menu a {
    padding: var(--spacing-sm) var(--spacing-md);
  }
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  position: relative;
  height: 60vh;
  min-height: 500px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13, 15, 14, 0.82) 0%, rgba(28, 31, 29, 0.62) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: var(--spacing-xl);
  max-width: 800px;
}

.hero-content h1 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   CTA BUTTONS
   ============================================ */
.cta-primary,
.cta-secondary {
  display: inline-block;
  padding: 12px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.cta-primary {
  background: var(--primary-neon);
  color: #fff;
  box-shadow: 0 0 20px var(--primary-neon-glow);
}

.cta-primary:hover {
  transform: translateY(-2px);
  background: #24c574;
  box-shadow: 0 0 30px var(--primary-neon-glow);
}

.cta-secondary {
  background: transparent;
  color: var(--primary-neon);
  border: 2px solid var(--primary-neon);
}

.cta-secondary:hover {
  background: rgba(31, 173, 102, 0.1);
}

/* ============================================
   FEATURED CARD
   ============================================ */
.featured {
  padding: var(--spacing-2xl) var(--spacing-md);
  background: linear-gradient(135deg, rgba(28, 31, 29, 0.5), rgba(20, 23, 20, 0.5));
}

.featured-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  max-width: 1000px;
  margin: 0 auto;
  background: rgba(28, 31, 29, 0.6);
  border: 1px solid var(--border-color);
  border-radius: calc(var(--radius) * 2);
  padding: var(--spacing-lg);
  backdrop-filter: blur(10px);
}

.featured-image {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
}

.featured-image img {
  width: 100%;
  height: auto;
  display: block;
}

.rating-badge {
  position: absolute;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  background: rgba(13, 15, 14, 0.9);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stars {
  color: var(--accent-yellow);
  font-size: 18px;
}

.rating-value {
  font-size: 14px;
  color: var(--text-secondary);
  font-weight: 600;
}

.featured-content h2 {
  color: var(--primary-neon);
}

.highlight {
  color: var(--accent-green);
  font-weight: 600;
  font-size: 18px;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

@media (min-width: 768px) {
  .featured-card {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
}

/* ============================================
   TABLE OF CONTENTS
   ============================================ */
.toc {
  padding: var(--spacing-xl) var(--spacing-md);
  background: rgba(28, 31, 29, 0.35);
  border: 1px solid var(--border-color);
  margin: var(--spacing-lg) var(--spacing-md);
  border-radius: calc(var(--radius) * 2);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.toc h2 {
  margin: 0 0 var(--spacing-md) 0;
}

.toc-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  background: none;
  border: none;
  color: var(--primary-neon);
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.toc-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.toc-list.active {
  max-height: 500px;
}

.toc-list li {
  margin: 0;
}

.toc-list a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-left: 3px solid transparent;
  transition: var(--transition);
}

.toc-list a:hover {
  border-left-color: var(--primary-neon);
  padding-left: calc(var(--spacing-md) + 6px);
}

/* ============================================
   ARTICLE CONTENT
   ============================================ */
.article-content {
  padding: var(--spacing-2xl) var(--spacing-md);
}

.content-section {
  margin-bottom: var(--spacing-2xl);
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

.content-section h2 {
  color: var(--primary-neon);
  border-bottom: 2px solid var(--primary-neon-glow);
  padding-bottom: var(--spacing-md);
}

.content-section h3 {
  color: var(--accent-cyan);
  margin-top: var(--spacing-xl);
}

.feature-list {
  list-style: none;
  padding-left: 0;
}

.feature-list li {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
  position: relative;
}

.feature-list li:before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--primary-neon);
  font-size: 20px;
}

.numbered-list {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.numbered-list li {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

/* ============================================
   TABLES
   ============================================ */
.table-wrapper {
  overflow-x: auto;
  margin: var(--spacing-lg) 0;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(20, 23, 20, 0.5);
}

thead {
  background: rgba(28, 31, 29, 0.9);
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  color: var(--primary-neon);
  border-bottom: 2px solid var(--border-color);
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

tbody tr:hover {
  background: rgba(31, 173, 102, 0.05);
}

/* ============================================
   INLINE CTAs
   ============================================ */
.inline-cta {
  margin: var(--spacing-2xl) auto;
  padding: var(--spacing-xl);
  background: rgba(28, 31, 29, 0.6);
  border: 2px solid var(--border-color);
  border-radius: calc(var(--radius) * 2);
  text-align: center;
  max-width: 600px;
}

.inline-cta.highlighted {
  background: linear-gradient(135deg, rgba(31, 173, 102, 0.1), rgba(23, 133, 78, 0.05));
  border-color: var(--primary-neon);
}

.inline-cta.featured {
  background: linear-gradient(135deg, rgba(212, 144, 58, 0.1), rgba(31, 173, 102, 0.08));
  border-color: var(--accent-yellow);
}

.cta-icon {
  display: block;
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}

.inline-cta h3 {
  margin-top: 0;
}

.inline-cta p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-item {
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-item summary {
  padding: var(--spacing-md);
  background: rgba(28, 31, 29, 0.6);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary:hover {
  background: rgba(31, 173, 102, 0.1);
}

.faq-item summary::marker {
  color: var(--primary-neon);
}

.faq-item p {
  padding: var(--spacing-md);
  background: rgba(20, 23, 20, 0.8);
  color: var(--text-secondary);
  margin: 0;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: rgba(20, 23, 20, 0.95);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-2xl) var(--spacing-md);
  margin-top: var(--spacing-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto var(--spacing-lg);
}

.footer-col h3 {
  color: var(--primary-neon);
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

.footer-col ul {
  list-style: none;
  padding: 0;
}

.footer-col ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-col a {
  color: var(--text-secondary);
}

.footer-col a:hover {
  color: var(--primary-neon);
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-lg);
  color: var(--text-muted);
}

.disclaimer {
  font-size: 14px;
  margin-top: var(--spacing-md);
}

/* ============================================
   FLOATING CTA
   ============================================ */
.floating-cta {
  position: fixed;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 999;
  display: none;
}

.floating-cta a {
  display: block;
  padding: 12px 24px;
  background: var(--primary-neon);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
}

.floating-cta a:hover {
  transform: translateY(-4px);
}

@media (min-width: 768px) {
  .floating-cta {
    display: block;
  }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 767px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 24px;
  }

  .featured-card {
    padding: var(--spacing-md);
  }

  table {
    font-size: 14px;
  }

  th, td {
    padding: var(--spacing-sm);
  }

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

  .cta-primary,
  .cta-secondary {
    width: 100%;
  }

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

@media (min-width: 1024px) {
  .floating-cta {
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-neon);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-cyan);
}