/* ============================================
   ADVERTISING GUIDES WEBSITE - STYLE SYSTEM
   Modern, clean design inspired by Stripe/Linear/Vercel
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-primary: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-primary-light: #EEF2FF;
  --color-background: #FFFFFF;
  --color-surface: #F9FAFB;
  --color-surface-raised: #FFFFFF;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-text-muted: #9CA3AF;
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  --color-code-bg: #1F2937;
  --color-code-text: #E5E7EB;
  --color-blockquote-bg: #F0F4FF;
  --color-blockquote-border: #4F46E5;

  /* 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;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;

  /* Borders & Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --header-height: 64px;
  --container-max: 1200px;
  --sidebar-width: 280px;
}


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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-height) + var(--space-xl));
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
  width: 100%;
}

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

/* Constrain all inline SVGs inside containers */
.platform-icon svg,
.platform-hero-icon svg,
.goal-icon svg,
.footer-brand svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.platform-hero-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.2);
  margin-bottom: var(--space-lg);
}

.platform-hero-icon svg {
  width: 28px;
  height: 28px;
}

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button, input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

button {
  cursor: pointer;
}

main {
  overflow-x: hidden;
  width: 100%;
}


/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  overflow-x: hidden;
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-2xl);
  }
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

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

.logo svg,
.logo img {
  width: 28px;
  height: 28px;
}

.main-nav {
  display: none;
  align-items: center;
  gap: var(--space-xs);
}

@media (min-width: 768px) {
  .main-nav {
    display: flex;
  }
}


.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
  background-color: var(--color-surface);
}

.nav-search {
  display: none;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.nav-search:hover {
  border-color: var(--color-text-muted);
}

@media (min-width: 1024px) {
  .nav-search {
    display: flex;
  }
}

.mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-toggle:hover {
  background-color: var(--color-surface);
}

@media (min-width: 768px) {
  .mobile-toggle {
    display: none;
  }
}


/* --- Hero Section --- */
.hero {
  padding-top: calc(var(--header-height) + var(--space-4xl));
  padding-bottom: var(--space-4xl);
  background: linear-gradient(135deg, #EEF2FF 0%, #F5F3FF 50%, #FDF4FF 100%);
  text-align: center;
}

.hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: var(--font-size-5xl);
  }
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

.hero-search {
  max-width: 520px;
  width: 100%;
  margin: 0 auto var(--space-xl);
}

.hero-search button {
  display: none;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.search-input-wrap svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
}

.search-input-wrap input {
  flex: 1;
  min-width: 0;
  font-size: var(--font-size-base);
  color: var(--color-text);
}

.search-input-wrap input::placeholder {
  color: var(--color-text-muted);
}

.search-input-wrap.large {
  padding: var(--space-lg) var(--space-xl);
}

.search-input-wrap.large input {
  font-size: var(--font-size-lg);
}

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

.hero-tags span {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-right: var(--space-sm);
}

.hero-tags a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.hero-tags a:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}


/* --- Page Sections --- */
.page-section {
  padding: var(--space-4xl) 0;
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  text-align: center;
}

@media (min-width: 768px) {
  .section-title {
    font-size: var(--font-size-3xl);
  }
}

.section-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  text-align: center;
  max-width: 560px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.7;
}

/* --- Platforms Section --- */
.platforms-section {
  padding: var(--space-4xl) 0;
  background: var(--color-background);
}

.platforms-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 640px) {
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .platforms-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.platform-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--space-xl);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

.platform-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent, var(--color-primary));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.platform-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.platform-card:hover::before {
  opacity: 1;
}

.platform-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--accent, var(--color-primary)) 10%, transparent);
  margin-bottom: var(--space-lg);
}

.platform-icon svg,
.platform-icon img {
  width: 24px;
  height: 24px;
  color: var(--accent, var(--color-primary));
}

.platform-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.platform-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  flex: 1;
}

.guide-count {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--accent, var(--color-primary));
  background: color-mix(in srgb, var(--accent, var(--color-primary)) 8%, transparent);
  border-radius: var(--radius-full);
  width: fit-content;
}


/* --- Goals Section --- */
.goals-section {
  padding: var(--space-4xl) 0;
  background: var(--color-surface);
}

.goals-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .goals-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.goal-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--space-2xl);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.goal-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.goal-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-xl);
}

.goal-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.goal-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
  flex: 1;
}

.goal-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  transition: gap var(--transition-fast);
}

.goal-link:hover {
  gap: var(--space-sm);
}


/* --- Fundamentals Section --- */
.fundamentals-section {
  padding: var(--space-4xl) 0;
  background: var(--color-background);
}

.fundamentals-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

@media (min-width: 640px) {
  .fundamentals-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .fundamentals-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.fund-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-xl);
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.fund-card:hover {
  background: var(--color-background);
  border-color: var(--color-border);
}

.fund-num {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.fund-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.fund-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}


/* --- Platform Hero (Guide Page) --- */
.platform-hero {
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent, var(--color-primary)) 8%, white), color-mix(in srgb, var(--accent, var(--color-primary)) 4%, white));
  border-bottom: 1px solid var(--color-border);
}

.platform-hero h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

@media (min-width: 768px) {
  .platform-hero h1 {
    font-size: var(--font-size-4xl);
  }
}

.platform-hero p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--accent, var(--color-primary));
  background: color-mix(in srgb, var(--accent, var(--color-primary)) 10%, transparent);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* --- Guides Sidebar Layout --- */
.guides-sidebar-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  padding: var(--space-3xl) 0;
}

@media (min-width: 1024px) {
  .guides-sidebar-layout {
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--space-3xl);
  }
}

.guides-nav {
  display: none;
}

@media (min-width: 1024px) {
  .guides-nav {
    display: block;
    position: sticky;
    top: calc(var(--header-height) + var(--space-xl));
    align-self: start;
  }
}

.guides-nav h3 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.guides-nav ol {
  list-style: none;
  counter-reset: guide-step;
}

.guides-nav ol li {
  counter-increment: guide-step;
}

.guides-nav ol li a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.guides-nav ol li a:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.guides-nav ol li a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
  font-weight: 500;
}


/* --- Guide Cards --- */
.guides-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.guide-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.guide-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.guide-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
}

.guide-card-content {
  flex: 1;
  min-width: 0;
}

.guide-card-content h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.guide-card-content p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.guide-arrow {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.guide-card:hover .guide-arrow {
  color: var(--color-primary);
  transform: translateX(4px);
}


/* --- Article Layout --- */
.guide-article {
  padding-top: var(--header-height);
}

.guide-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  padding: var(--space-2xl) 0;
}

@media (min-width: 1024px) {
  .guide-layout {
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--space-3xl);
    padding: var(--space-3xl) 0;
  }
}

.guide-sidebar {
  display: none;
}

@media (min-width: 1024px) {
  .guide-sidebar {
    display: block;
    position: sticky;
    top: calc(var(--header-height) + var(--space-xl));
    align-self: start;
    max-height: calc(100vh - var(--header-height) - var(--space-2xl));
    overflow-y: auto;
    padding-right: var(--space-lg);
  }
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

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

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--color-border);
  padding-left: var(--space-md);
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.sidebar-nav a::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-md) - 1px);
  top: 50%;
  transform: translateY(-50%);
  width: 2px;
  height: 0;
  background: var(--color-primary);
  transition: height var(--transition-fast);
  border-radius: 1px;
}

.sidebar-nav a:hover {
  color: var(--color-text);
}

.sidebar-nav a.active {
  color: var(--color-primary);
  font-weight: 500;
}

.sidebar-nav a.active::before {
  height: 20px;
}

.nav-num {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  min-width: 20px;
}

.sidebar-nav a.active .nav-num {
  color: var(--color-primary);
}


/* --- Guide Content (Article Typography) --- */
.guide-content {
  max-width: 720px;
  width: 100%;
  font-size: var(--font-size-lg);
  line-height: 1.8;
  color: var(--color-text);
  overflow-wrap: break-word;
  word-wrap: break-word;
}

.guide-content h1 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

.guide-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-lg);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-light);
  line-height: 1.3;
}

.guide-content h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  line-height: 1.4;
}

.guide-content h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
}

.guide-content h5,
.guide-content h6 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}

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

.guide-content a {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-fast);
}

.guide-content a:hover {
  text-decoration-color: var(--color-primary);
}

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

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

.guide-content ul {
  list-style: disc;
}

.guide-content ol {
  list-style: decimal;
}

.guide-content li {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-sm);
}

.guide-content li::marker {
  color: var(--color-text-muted);
}


/* --- Guide Content: Tables --- */
.table-wrapper {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: var(--space-xl);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.guide-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
  line-height: 1.5;
}

.guide-content thead {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.guide-content th {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
}

.guide-content td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
}

.guide-content tbody tr:last-child td {
  border-bottom: none;
}

.guide-content tbody tr:nth-child(even) {
  background: var(--color-surface);
}

.guide-content tbody tr:hover {
  background: color-mix(in srgb, var(--color-primary) 3%, white);
}

/* --- Guide Content: Code --- */
.guide-content code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

.guide-content pre {
  margin-bottom: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-code-bg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  line-height: 1.7;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.guide-content pre code {
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
  color: var(--color-code-text);
  font-size: var(--font-size-sm);
}

.inline-code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.875em;
  padding: 0.15em 0.4em;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}


/* --- Guide Content: Blockquotes --- */
.guide-content blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-blockquote-bg);
  border-left: 4px solid var(--color-blockquote-border);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

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

/* --- Guide Content: Horizontal Rules --- */
.guide-content hr {
  border: none;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-3xl) 0;
}

/* --- Guide Pagination --- */
.guide-pagination {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: var(--space-lg);
  margin-top: var(--space-4xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-border);
}

.guide-pagination a {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  max-width: 50%;
}

.guide-pagination a:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.guide-pagination a span:first-child {
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.guide-pagination a span:last-child {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.guide-pagination a:last-child {
  text-align: right;
  margin-left: auto;
}


/* --- Search Page --- */
.search-page {
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-4xl);
  min-height: 100vh;
}

.search-form-full {
  max-width: 640px;
  margin: 0 auto var(--space-3xl);
}

.results-count {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.search-results {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.search-result-card {
  display: block;
  padding: var(--space-xl);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.search-result-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.search-result-card h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.search-result-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.result-platform {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  color: var(--accent, var(--color-primary));
  background: color-mix(in srgb, var(--accent, var(--color-primary)) 10%, transparent);
}

.no-results {
  text-align: center;
  padding: var(--space-4xl) 0;
}

.no-results h2 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.no-results p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

.suggestion-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.suggestion-tags a {
  display: inline-flex;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.suggestion-tags a:hover {
  background: color-mix(in srgb, var(--color-primary) 15%, white);
}


/* --- Footer --- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-4xl) 0 var(--space-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-3xl);
  }
}

.footer-brand {
  max-width: 280px;
}

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

.footer-brand p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-links a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer-bottom p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.footer-bottom a {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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


/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: #FFFFFF;
  background: var(--color-primary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

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

/* --- Utility Icons --- */
.icon-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: #10B981;
}

.icon-cross {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: #EF4444;
}

.icon-warn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  color: #F59E0B;
}

.icon-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
}


/* --- Checkbox Visuals --- */
.checkbox {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.checkbox.checked {
  background: #10B981;
  border-color: #10B981;
  color: white;
}

.checkbox.unchecked {
  background: var(--color-background);
  border-color: var(--color-border);
}

/* --- Mobile Navigation Overlay --- */
@media (max-width: 767px) {
  .main-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-background);
    padding: var(--space-xl);
    gap: var(--space-sm);
    z-index: 999;
    animation: slideDown var(--transition-slow) ease;
  }

  .main-nav.open .nav-link {
    font-size: var(--font-size-lg);
    padding: var(--space-md);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Scrollbar Styling --- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* --- Selection --- */
::selection {
  background: color-mix(in srgb, var(--color-primary) 20%, transparent);
  color: var(--color-text);
}

/* --- Focus Styles (Accessibility) --- */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* --- Skip Link (Accessibility) --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}


/* --- Print Styles --- */
@media print {
  .site-header,
  .site-footer,
  .guide-sidebar,
  .guide-pagination {
    display: none;
  }

  .guide-content {
    max-width: 100%;
    font-size: 12pt;
  }

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

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

  html {
    scroll-behavior: auto;
  }
}

/* --- Dark Mode Support (optional enhancement) --- */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0F172A;
    --color-surface: #1E293B;
    --color-surface-raised: #1E293B;
    --color-text: #F1F5F9;
    --color-text-secondary: #94A3B8;
    --color-text-muted: #64748B;
    --color-border: #334155;
    --color-border-light: #1E293B;
    --color-primary-light: rgba(79, 70, 229, 0.15);
    --color-code-bg: #0F172A;
    --color-code-text: #E2E8F0;
    --color-blockquote-bg: rgba(79, 70, 229, 0.08);
  }

  .site-header {
    background: rgba(15, 23, 42, 0.85);
  }

  .hero {
    background: linear-gradient(135deg, #1E1B4B 0%, #1E293B 50%, #1E293B 100%);
  }

  .platform-hero {
    background: linear-gradient(135deg, color-mix(in srgb, var(--accent, var(--color-primary)) 12%, #0F172A), #0F172A);
  }

  .search-input-wrap {
    background: var(--color-surface);
  }

  .guide-content code {
    background: var(--color-surface);
    border-color: var(--color-border);
  }
}

/* --- Loading Skeleton (utility) --- */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border-light) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes shimmer {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* --- Utility: Visually Hidden --- */
.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;
}

/* --- Body spacing for fixed header --- */
body {
  padding-top: var(--header-height);
}