/* ============================================================================
   Clean Language Website - Main Stylesheet
   Professional light theme with clean developer aesthetic
   ============================================================================ */

/* ============================================================================
   CSS Custom Properties (Design Tokens)
   ============================================================================ */
:root {
  /* Color Palette - Clean Light Theme */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8f9fb;
  --color-bg-elevated: #ffffff;
  --color-bg-card: #ffffff;

  --color-text-primary: #111827;
  --color-text-secondary: #5b6478;
  --color-text-muted: #9098a9;

  --color-accent-primary: #2563eb;
  --color-accent-primary-hover: #1d4ed8;
  --color-accent-secondary: #0ea5e9;
  --color-accent-gradient-start: #2563eb;
  --color-accent-gradient-end: #0ea5e9;

  --color-success: #16a34a;
  --color-warning: #d97706;
  --color-error: #dc2626;

  --color-border: #e5e7eb;
  --color-border-light: #d1d5db;

  --color-code-bg: #1e1e2e;
  --color-code-border: #2a2a3c;
  --color-code-text: #cdd6f4;

  /* Typography */
  --font-display: 'General Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'General Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-lg: 1.0625rem;
  --font-size-xl: 1.1875rem;
  --font-size-2xl: 1.375rem;
  --font-size-3xl: 1.75rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  --line-height-tight: 1.2;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.75;

  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: -0.01em;

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

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 8px 32px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 40px rgba(37, 99, 235, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.22, 1, 0.36, 1);

  /* Layout */
  --container-max-width: 1200px;
  --nav-height: 3.5rem;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
  letter-spacing: var(--letter-spacing-normal);
}

::selection {
  background-color: rgba(37, 99, 235, 0.15);
  color: var(--color-text-primary);
}

/* ============================================================================
   Typography
   ============================================================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: var(--letter-spacing-tight);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
}

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

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

strong {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background-color: #f1f5f9;
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  color: #0f172a;
}

pre {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  background-color: var(--color-code-bg);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-code-border);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
  color: var(--color-code-text);
}

pre code {
  background: none;
  padding: 0;
  border: none;
  color: var(--color-code-text);
}

/* ============================================================================
   Layout Utilities
   ============================================================================ */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-xl);
  padding-right: var(--spacing-xl);
}

.section {
  padding-top: var(--spacing-4xl);
  padding-bottom: var(--spacing-4xl);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.flex {
  display: flex;
}

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

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ============================================================================
   Navigation Bar
   ============================================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  transition: opacity var(--transition-fast);
  letter-spacing: var(--letter-spacing-tight);
}

.navbar-logo:hover {
  opacity: 0.7;
  color: var(--color-text-primary);
}

.navbar-logo-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--color-accent-gradient-start), var(--color-accent-gradient-end));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  color: white;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  list-style: none;
}

.navbar-link {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  position: relative;
  padding: 6px 12px;
  border-radius: var(--radius-md);
}

.navbar-link:hover {
  color: var(--color-text-primary);
  background: #f1f5f9;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--color-accent-primary);
  transition: width var(--transition-base);
  border-radius: 1px;
}

.navbar-link:hover::after {
  width: 60%;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-2xl);
  cursor: pointer;
  padding: var(--spacing-sm);
}

/* Language Switcher */
.language-switcher {
  position: relative;
}

.language-button {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
}

.language-button:hover {
  background-color: #f1f5f9;
  border-color: var(--color-border-light);
  color: var(--color-text-primary);
}

.language-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 4px;
  min-width: 140px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-xl);
}

.language-switcher.active .language-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-option {
  display: block;
  width: 100%;
  padding: 8px 12px;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-family: var(--font-body);
  text-align: left;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.language-option:hover {
  background-color: #f1f5f9;
  color: var(--color-text-primary);
}

.language-option.active {
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
}

/* ============================================================================
   Hero Section
   ============================================================================ */
.hero {
  padding-top: calc(var(--spacing-4xl) + var(--spacing-3xl));
  padding-bottom: var(--spacing-4xl);
  text-align: center;
  position: relative;
  overflow: hidden;
  background: var(--color-bg-secondary);
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 900px;
  background: radial-gradient(ellipse, rgba(37, 99, 235, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 600px 300px at 20% 50%, rgba(14, 165, 233, 0.04) 0%, transparent 100%),
    radial-gradient(ellipse 600px 300px at 80% 30%, rgba(37, 99, 235, 0.04) 0%, transparent 100%);
  pointer-events: none;
}

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

.hero-title {
  font-family: var(--font-display);
  font-size: var(--font-size-6xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-primary);
  letter-spacing: -0.035em;
}

.hero-title-gradient {
  background: linear-gradient(135deg, var(--color-accent-gradient-start), var(--color-accent-gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 580px;
  margin: 0 auto var(--spacing-2xl);
  line-height: var(--line-height-relaxed);
  font-weight: var(--font-weight-normal);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* ============================================================================
   Buttons
   ============================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  letter-spacing: 0;
}

.btn-primary {
  background: var(--color-accent-primary);
  color: white;
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-primary-hover);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  transform: translateY(-1px);
  color: white;
}

.btn-secondary {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-secondary:hover {
  background-color: #f8f9fb;
  border-color: var(--color-border-light);
  transform: translateY(-1px);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

.btn-outline {
  background: transparent;
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  background-color: #f8f9fb;
  border-color: var(--color-border-light);
  transform: translateY(-1px);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-sm);
}

.btn-lg {
  padding: 12px 28px;
  font-size: var(--font-size-base);
}

.btn-sm {
  padding: 6px 14px;
  font-size: var(--font-size-xs);
}

/* ============================================================================
   Cards
   ============================================================================ */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-slow);
}

.card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.card-icon svg {
  width: 22px;
  height: 22px;
  color: var(--color-accent-primary);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.card-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--spacing-lg);
  color: var(--color-accent-primary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.card-link:hover {
  color: var(--color-accent-primary-hover);
  gap: 10px;
}

/* ============================================================================
   Feature Cards
   ============================================================================ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.feature-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-gradient-start), var(--color-accent-gradient-end));
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.feature-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* ============================================================================
   Code Blocks
   ============================================================================ */
.code-preview {
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.code-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
  gap: var(--spacing-lg);
}

.code-block {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px var(--spacing-lg);
  background-color: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid var(--color-code-border);
}

.code-block-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: #8b8fa3;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.code-block-copy {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #8b8fa3;
  cursor: pointer;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-family: var(--font-body);
  transition: all var(--transition-fast);
}

.code-block-copy:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: #cdd6f4;
  border-color: rgba(255, 255, 255, 0.15);
}

.code-block-content {
  padding: var(--spacing-lg);
  overflow-x: auto;
}

.code-block-content pre {
  margin: 0;
  background: none;
  border: none;
  padding: 0;
  color: var(--color-code-text);
}

.code-block-content pre code {
  color: var(--color-code-text);
}

/* Syntax Highlighting */
.code-keyword { color: #c792ea; }
.code-string { color: #a5d6a7; }
.code-number { color: #f9cb8b; }
.code-comment { color: #546e7a; font-style: italic; }
.code-function { color: #82aaff; }
.code-class { color: #ffcb6b; }

/* ============================================================================
   AI-Ready Section
   ============================================================================ */
.ai-section {
  background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
  position: relative;
  overflow: hidden;
}

.ai-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 800px 400px at 30% 20%, rgba(37, 99, 235, 0.04) 0%, transparent 100%),
    radial-gradient(ellipse 600px 300px at 70% 80%, rgba(14, 165, 233, 0.03) 0%, transparent 100%);
  pointer-events: none;
}

.ai-features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
  position: relative;
}

.ai-feature-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-slow);
  display: flex;
  flex-direction: column;
}

.ai-feature-card:hover {
  border-color: rgba(37, 99, 235, 0.25);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(37, 99, 235, 0.06);
}

.ai-feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(14, 165, 233, 0.08));
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.ai-feature-icon svg {
  width: 22px;
  height: 22px;
  color: var(--color-accent-primary);
}

.ai-feature-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.ai-feature-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

.ai-feature-code {
  margin-top: auto;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.ai-feature-code pre {
  margin: 0;
  padding: var(--spacing-md);
  font-size: var(--font-size-xs);
  line-height: 1.6;
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
}

.ai-feature-code pre code {
  color: var(--color-code-text);
  background: none;
  border: none;
  padding: 0;
  font-size: var(--font-size-xs);
}

/* ============================================================================
   Section Headers
   ============================================================================ */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-eyebrow {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
  letter-spacing: var(--letter-spacing-tight);
}

.section-description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed);
}

/* ============================================================================
   Steps / Process
   ============================================================================ */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.step {
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  background: rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-lg);
}

.step-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

.step-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ============================================================================
   Badges & Tags
   ============================================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  font-size: 0.6875rem;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.badge-beginner {
  background-color: rgba(22, 163, 74, 0.08);
  color: var(--color-success);
  border: 1px solid rgba(22, 163, 74, 0.15);
}

.badge-intermediate {
  background-color: rgba(217, 119, 6, 0.08);
  color: var(--color-warning);
  border: 1px solid rgba(217, 119, 6, 0.15);
}

.badge-advanced {
  background-color: rgba(220, 38, 38, 0.08);
  color: var(--color-error);
  border: 1px solid rgba(220, 38, 38, 0.15);
}

.badge-primary {
  background-color: rgba(37, 99, 235, 0.08);
  color: var(--color-accent-primary);
  border: 1px solid rgba(37, 99, 235, 0.15);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.6875rem;
  background-color: #f1f5f9;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--spacing-sm);
}

/* ============================================================================
   Forms & Search
   ============================================================================ */
.search-bar {
  position: relative;
  max-width: 520px;
  margin: 0 auto var(--spacing-2xl);
}

.search-input {
  width: 100%;
  padding: 12px 16px;
  padding-left: 44px;
  font-family: var(--font-body);
  font-size: var(--font-size-sm);
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text-primary);
  transition: all var(--transition-base);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
}

.search-icon svg {
  width: 18px;
  height: 18px;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.form-input, .form-select {
  width: 100%;
  padding: var(--spacing-md);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  transition: all var(--transition-base);
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ============================================================================
   Syntax Catalog Specific
   ============================================================================ */
.syntax-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-xl);
}

.syntax-sidebar {
  position: sticky;
  top: calc(var(--nav-height) + var(--spacing-lg));
  height: fit-content;
}

.syntax-categories {
  list-style: none;
}

.syntax-category {
  margin-bottom: 2px;
}

.syntax-category-link {
  display: block;
  padding: 8px 14px;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.syntax-category-link:hover,
.syntax-category-link.active {
  background-color: #f1f5f9;
  color: var(--color-text-primary);
}

.syntax-category-link.active {
  border-left: 2px solid var(--color-accent-primary);
  color: var(--color-accent-primary);
}

.syntax-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.syntax-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-slow);
}

.syntax-card:hover {
  border-color: var(--color-border-light);
  box-shadow: var(--shadow-md);
}

.syntax-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.syntax-card-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.syntax-card-code {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  overflow-x: auto;
}

.syntax-card-code code {
  background: none;
  border: none;
  padding: 0;
  color: #89b4fa;
  font-size: var(--font-size-sm);
}

.syntax-card-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* ============================================================================
   Module Cards
   ============================================================================ */
.module-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-slow);
  display: flex;
  flex-direction: column;
}

.module-card:hover {
  border-color: var(--color-border-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.module-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.module-card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.module-card-meta {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.module-card-description {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.module-card-topics {
  margin-top: auto;
}

.module-card-topics-title {
  font-size: 0.6875rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-sm);
}

/* ============================================================================
   Filter Bar
   ============================================================================ */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--spacing-2xl);
  flex-wrap: wrap;
}

.filter-button {
  padding: 7px 16px;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-button:hover {
  background-color: #f1f5f9;
  color: var(--color-text-primary);
  border-color: var(--color-border-light);
}

.filter-button.active {
  background-color: var(--color-accent-primary);
  color: white;
  border-color: var(--color-accent-primary);
}

/* ============================================================================
   Footer
   ============================================================================ */
.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-4xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-lg);
}

.footer-links {
  list-style: none;
}

.footer-link {
  display: block;
  padding: 4px 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: 8px;
}

.footer-social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.footer-social-link:hover {
  background-color: rgba(37, 99, 235, 0.08);
  border-color: rgba(37, 99, 235, 0.2);
  color: var(--color-accent-primary);
  transform: translateY(-1px);
}

.footer-social-link svg {
  width: 16px;
  height: 16px;
}

/* ============================================================================
   Animations
   ============================================================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInFromLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

.fade-in {
  animation: fadeIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.fade-in-delay-1 {
  animation: fadeIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.12s forwards;
  opacity: 0;
}

.fade-in-delay-2 {
  animation: fadeIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.24s forwards;
  opacity: 0;
}

.fade-in-delay-3 {
  animation: fadeIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) 0.36s forwards;
  opacity: 0;
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================================
   Responsive Design
   ============================================================================ */
@media (max-width: 1024px) {
  .ai-features-grid {
    grid-template-columns: 1fr;
  }

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

  .syntax-sidebar {
    position: static;
  }

  .syntax-categories {
    display: flex;
    overflow-x: auto;
    padding-bottom: var(--spacing-sm);
    gap: 4px;
  }

  .syntax-category {
    margin-bottom: 0;
  }

  .syntax-category-link {
    white-space: nowrap;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-6xl: 2.25rem;
    --font-size-5xl: 1.875rem;
    --font-size-4xl: 1.5rem;
    --font-size-3xl: 1.25rem;
  }

  .container {
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
  }

  .navbar-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-lg);
    gap: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-base);
  }

  .navbar-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .navbar-toggle {
    display: block;
  }

  .hero {
    padding-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .section {
    padding-top: var(--spacing-3xl);
    padding-bottom: var(--spacing-3xl);
  }

  .features-grid,
  .ai-features-grid,
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }

  .code-preview-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-6xl: 1.875rem;
    --font-size-5xl: 1.5rem;
    --font-size-4xl: 1.25rem;
  }

  .container {
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
  }

  .btn {
    width: 100%;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-button {
    width: 100%;
    text-align: center;
  }
}

/* ============================================================================
   Utility Classes
   ============================================================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }
.mt-3xl { margin-top: var(--spacing-3xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }
.mb-3xl { margin-bottom: var(--spacing-3xl); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }