/* ===================================
   SyntaxNext — SEO-Optimized Styles
   Performance-first, minimal CSS
   =================================== */

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

:root {
  --color-primary: #6C3FE8;
  --color-primary-dark: #5530C0;
  --color-primary-light: #8B6AEF;
  --color-bg: #0A0A0F;
  --color-surface: #13131A;
  --color-surface-hover: #1C1C26;
  --color-border: #2A2A3A;
  --color-text: #E8E8ED;
  --color-text-muted: #9999AA;
  --color-accent: #00D4AA;
  --color-gradient-start: #6C3FE8;
  --color-gradient-end: #00D4AA;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 200ms ease;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* Accessibility */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--color-primary);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  font-weight: 600;
}

.skip-link:focus {
  top: 16px;
}

.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;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===================================
   Header / Navigation
   =================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 600;
}

.logo-mark {
  color: var(--color-primary-light);
  font-size: 1.5rem;
}

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

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--color-text);
}

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  left: 0;
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9375rem;
  transition: all var(--transition);
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(108, 63, 232, 0.4);
}

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

.btn-outline:hover,
.btn-outline:focus {
  border-color: var(--color-primary-light);
  color: var(--color-primary-light);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
}

.btn-ghost:hover,
.btn-ghost:focus {
  color: var(--color-text);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  padding: 100px 0 80px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(108, 63, 232, 0.15);
  border: 1px solid rgba(108, 63, 232, 0.3);
  border-radius: 100px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary-light);
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

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

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.hero-proof {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Code Window */
.code-window {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-window-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--color-border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red { background: #FF5F57; }
.dot.yellow { background: #FFBD2E; }
.dot.green { background: #28CA41; }

.code-filename {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.code-block {
  padding: 24px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.875rem;
  line-height: 1.8;
  overflow-x: auto;
}

.code-block .kw { color: #C792EA; }
.code-block .str { color: #C3E88D; }
.code-block .fn { color: #82AAFF; }
.code-block .cm { color: #546E7A; }

/* ===================================
   Logos Section
   =================================== */
.logos-section {
  padding: 60px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.logos-heading {
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 32px;
}

.logos-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 48px;
}

.logo-item {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-muted);
  opacity: 0.6;
}

/* ===================================
   Features Section
   =================================== */
.features {
  padding: 120px 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(108, 63, 232, 0.15);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===================================
   How It Works
   =================================== */
.how-it-works {
  padding: 120px 0;
  background: var(--color-surface);
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  counter-reset: step;
  list-style: none;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.step h3 {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.step code {
  background: rgba(108, 63, 232, 0.15);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

/* ===================================
   Testimonials
   =================================== */
.testimonials {
  padding: 120px 0;
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.testimonial-card p {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-card cite {
  font-style: normal;
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.testimonial-card cite strong {
  color: var(--color-text);
  display: block;
  margin-bottom: 2px;
}

/* ===================================
   CTA Section
   =================================== */
.cta-section {
  padding: 120px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(108, 63, 232, 0.08) 100%);
}

.cta-section h2 {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-section p {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  margin-bottom: 32px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===================================
   Footer
   =================================== */
.site-footer {
  padding: 80px 0 32px;
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  max-width: 280px;
}

.footer-nav h3 {
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-nav a:hover,
.footer-nav a:focus {
  color: var(--color-text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.social-links {
  display: flex;
  gap: 24px;
}

.social-links a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.social-links a:hover,
.social-links a:focus {
  color: var(--color-primary-light);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
  .features-grid,
  .testimonials-grid,
  .steps-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .hero .container {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .nav-links,
  .nav-actions {
    display: none;
  }

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

  .features-grid,
  .testimonials-grid,
  .steps-list {
    grid-template-columns: 1fr;
  }

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

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .hero {
    padding: 60px 0;
  }

  .features,
  .how-it-works,
  .testimonials,
  .cta-section {
    padding: 80px 0;
  }
}

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

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

  .btn-lg {
    width: 100%;
  }
}

/* ===================================
   Print Styles (SEO accessibility)
   =================================== */
@media print {
  .site-header,
  .hero-visual,
  .btn,
  .cta-section {
    display: none;
  }

  body {
    color: #000;
    background: #fff;
  }
}


/* ===================================
   Scroll Animations (non-blocking)
   =================================== */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ===================================
   Mobile Nav Open State
   =================================== */
@media (max-width: 768px) {
  .nav-links.nav-open,
  .nav-actions.nav-open {
    display: flex;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 24px;
    gap: 16px;
  }

  .nav-links.nav-open {
    padding-bottom: 0;
  }

  .nav-actions.nav-open {
    border-top: 1px solid var(--color-border);
  }
}

/* ===================================
   Focus visible for keyboard nav
   =================================== */
:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 2px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .animate-on-scroll {
    opacity: 1;
    transform: none;
  }
}