/* StartupGrowthTactics - Custom CSS with System Fonts */

/* ==========================================
   CSS Variables - Design System
   ========================================== */

:root {
  /* Typography - System Fonts */
  --font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;

  /* Primary Colors */
  --color-primary: #059669;
  --color-primary-light: #10B981;
  --color-primary-dark: #047857;
  --color-accent: #7C3AED;
  --color-accent-hover: #6D28D9;
  --color-accent-light: #A855F7;
  --color-secondary: #0EA5E9;

  /* Neutrals */
  --color-text: #0F172A;
  --color-text-muted: #475569;
  --color-text-light: #64748B;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --color-bg: #F0FDF4;
  --color-bg-alt: #F8FAFC;
  --color-white: #FFFFFF;

  /* Semantic */
  --color-success: #22C55E;
  --color-warning: #F59E0B;
  --color-error: #EF4444;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #059669 0%, #0D9488 100%);
  --gradient-accent: linear-gradient(135deg, #7C3AED 0%, #A855F7 100%);
  --gradient-hero: linear-gradient(135deg, #059669 0%, #047857 50%, #0D9488 100%);

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
  --shadow-xl: 0 20px 40px rgba(5,150,105,0.15);
  --shadow-glow: 0 4px 14px rgba(5,150,105,0.3);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   Base Styles
   ========================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-white);
  margin: 0;
  padding: 0;
}

/* ==========================================
   Typography
   ========================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  margin-top: 0;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 600;
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  margin-top: 0;
  margin-bottom: var(--space-md);
}

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

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

.lead {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==========================================
   Layout
   ========================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container-narrow {
  max-width: 800px;
}

.section {
  padding: var(--space-4xl) 0;
}

.section-sm {
  padding: var(--space-3xl) 0;
}

/* ==========================================
   Header & Navigation
   ========================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-light);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

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

.logo:hover {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
  }

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

  .mobile-menu-toggle {
    display: block;
  }
}

/* ==========================================
   Hero Section
   ========================================== */

.hero {
  background: var(--gradient-hero);
  color: var(--color-white);
  padding: var(--space-4xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: var(--space-lg);
}

.hero .lead {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1.35rem;
  margin-bottom: var(--space-2xl);
}

.hero-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ==========================================
   Buttons
   ========================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--transition-normal);
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(5,150,105,0.4);
  color: var(--color-primary-dark);
}

.btn-secondary {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255, 255, 255, 0.8);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn-accent {
  background: var(--gradient-accent);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
  color: var(--color-white);
}

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

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

.btn-sm {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: 1.125rem;
}

/* ==========================================
   Stats Section
   ========================================== */

.stats-section {
  background: var(--color-bg);
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

.stat-card {
  text-align: center;
  padding: var(--space-lg);
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat-label {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ==========================================
   Guide Cards
   ========================================== */

.guides-section {
  padding: var(--space-4xl) 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

.guides-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

@media (max-width: 992px) {
  .guides-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .guides-grid {
    grid-template-columns: 1fr;
  }
}

.guide-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.guide-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.guide-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
}

.guide-card:hover::before {
  transform: scaleX(1);
}

.guide-card-icon {
  width: 48px;
  height: 48px;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--color-primary);
}

.guide-card-icon svg {
  width: 24px;
  height: 24px;
}

.category-tag {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg);
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-md);
}

.category-tag.viral {
  background: #FDF4FF;
  color: var(--color-accent);
}

.category-tag.retention {
  background: #FEF3C7;
  color: #D97706;
}

.category-tag.analytics {
  background: #E0F2FE;
  color: var(--color-secondary);
}

.guide-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.guide-card h3 a {
  color: var(--color-text);
}

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

.guide-card p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin-bottom: var(--space-lg);
  flex-grow: 1;
}

.guide-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
  color: var(--color-text-light);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-light);
}

.read-more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 600;
  color: var(--color-primary);
}

.read-more svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.guide-card:hover .read-more svg {
  transform: translateX(4px);
}

/* ==========================================
   Frameworks Section
   ========================================== */

.frameworks-section {
  background: var(--color-text);
  color: var(--color-white);
  padding: var(--space-4xl) 0;
}

.frameworks-section .section-header h2 {
  color: var(--color-white);
}

.frameworks-section .section-header p {
  color: rgba(255, 255, 255, 0.7);
}

.frameworks-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

@media (max-width: 992px) {
  .frameworks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .frameworks-grid {
    grid-template-columns: 1fr;
  }
}

.framework-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-slow);
}

.framework-card:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px);
}

.framework-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.framework-icon svg {
  width: 32px;
  height: 32px;
  color: var(--color-white);
}

.framework-card h3 {
  color: var(--color-white);
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
}

.framework-card p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
  margin: 0;
}

/* ==========================================
   About Section
   ========================================== */

.about-section {
  padding: var(--space-4xl) 0;
  background: var(--color-bg-alt);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

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

.about-text h2 {
  margin-bottom: var(--space-lg);
}

.about-text p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.about-features {
  list-style: none;
  padding: 0;
  margin: 0;
}

.about-features li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.about-features li svg {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-visual svg {
  filter: drop-shadow(0 10px 25px rgba(5, 150, 105, 0.15));
}

@media (max-width: 768px) {
  .about-visual {
    order: -1;
    margin-bottom: var(--space-xl);
  }
}

/* ==========================================
   Footer
   ========================================== */

.site-footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

@media (max-width: 992px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 576px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.footer-brand p {
  font-size: 0.9375rem;
  line-height: 1.6;
}

.footer-links h4 {
  color: var(--color-white);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}

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

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: 0.875rem;
}

/* ==========================================
   Guide Page Styles
   ========================================== */

.guide-hero {
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: var(--space-3xl) 0;
}

.guide-hero .category-tag {
  background: rgba(255, 255, 255, 0.2);
  color: var(--color-white);
}

.guide-hero h1 {
  color: var(--color-white);
  margin: var(--space-md) 0;
}

.guide-hero .lead {
  color: rgba(255, 255, 255, 0.9);
  max-width: 700px;
}

.guide-meta {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.8);
}

.guide-meta span {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Breadcrumb */
.breadcrumb {
  padding: var(--space-md) 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

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

.breadcrumb span {
  margin: 0 var(--space-sm);
}

/* Guide Content */
.guide-content {
  padding: var(--space-3xl) 0;
}

.guide-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--space-3xl);
  max-width: 1100px;
  margin: 0 auto;
}

@media (max-width: 992px) {
  .guide-layout {
    grid-template-columns: 1fr;
  }
}

/* Table of Contents */
.toc {
  position: sticky;
  top: 100px;
  align-self: start;
}

@media (max-width: 992px) {
  .toc {
    position: static;
    margin-bottom: var(--space-2xl);
    padding: var(--space-lg);
    background: var(--color-bg);
    border-radius: var(--radius-lg);
  }
}

.toc h2 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

.toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc li {
  margin-bottom: var(--space-sm);
}

.toc a {
  display: block;
  padding: var(--space-xs) 0;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  border-left: 2px solid transparent;
  padding-left: var(--space-md);
  transition: all var(--transition-fast);
}

.toc a:hover,
.toc a.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}

/* Key Takeaways */
.key-takeaways {
  background: var(--color-bg);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.key-takeaways h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.key-takeaways ul {
  margin: 0;
  padding-left: var(--space-lg);
}

.key-takeaways li {
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

/* Article Content */
.article-content {
  font-size: 1.0625rem;
  line-height: 1.8;
}

.article-content h2 {
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border-light);
}

.article-content h3 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
}

.article-content h4 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.article-content p {
  margin-bottom: var(--space-lg);
}

.article-content ul,
.article-content ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.article-content li {
  margin-bottom: var(--space-sm);
}

.article-content blockquote {
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-lg);
  margin: var(--space-xl) 0;
  font-style: italic;
  color: var(--color-text-muted);
}

.article-content code {
  background: var(--color-bg);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.article-content pre {
  background: var(--color-text);
  color: var(--color-white);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--space-xl) 0;
}

.article-content pre code {
  background: transparent;
  padding: 0;
}

/* Info/Tip Boxes */
.info-box {
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  margin: var(--space-xl) 0;
}

.info-box.tip {
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
}

.info-box.warning {
  background: #FFFBEB;
  border: 1px solid #FDE68A;
}

.info-box.note {
  background: #EFF6FF;
  border: 1px solid #BFDBFE;
}

.info-box h4 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: 0;
  margin-bottom: var(--space-sm);
}

/* Related Guides */
.related-guides {
  margin-top: var(--space-4xl);
  padding-top: var(--space-3xl);
  border-top: 1px solid var(--color-border);
}

.related-guides h2 {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

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

/* ==========================================
   Utility Classes
   ========================================== */

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

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

.text-accent {
  color: var(--color-accent);
}

.text-muted {
  color: var(--color-text-muted);
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

.hidden {
  display: none;
}

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

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

/* ==========================================
   Print Styles
   ========================================== */

@media print {
  .site-header,
  .site-footer,
  .toc,
  .related-guides {
    display: none;
  }

  .guide-layout {
    grid-template-columns: 1fr;
  }

  .article-content {
    font-size: 12pt;
  }
}