/* ===================================
   Modern Minimal Design System
   =================================== */

:root {
  /* Colors */
  --color-primary: #1a202c;
  --color-accent: #ff6b6b;
  --color-text: #2d3748;
  --color-text-light: #718096;
  --color-background: #ffffff;
  --color-background-alt: #f7fafc;
  --color-border: #e2e8f0;
  --color-code-bg: #2d3748;

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Courier New', monospace;

  /* Spacing */
  --spacing-unit: 1rem;
  --spacing-section: 4rem;
  --container-width: 1200px;

  /* Transitions */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 1.5rem;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-top: 3rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-top: 2rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1rem;
}

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

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

strong {
  font-weight: 600;
}

/* ===================================
   Header
   =================================== */

.site-header {
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.header-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title a {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.logo {
  font-size: 1.75rem;
}

.main-nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--color-text);
  font-weight: 400;
  transition: var(--transition-smooth);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition-smooth);
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link:hover::after {
  width: 100%;
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition-smooth);
}

/* ===================================
   Main Content
   =================================== */

.main-content {
  min-height: calc(100vh - 200px);
}

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

.hero {
  background: linear-gradient(135deg, var(--color-background-alt) 0%, var(--color-background) 100%);
  padding: 6rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(255, 107, 107, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(26, 32, 44, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.5rem);
  color: var(--color-text-light);
  margin-bottom: 2.5rem;
  font-weight: 300;
}

.cta-button {
  display: inline-block;
  background: var(--color-accent);
  color: white;
  padding: 1rem 2.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  font-size: 1.125rem;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 6px rgba(255, 107, 107, 0.2);
}

.cta-button:hover {
  background: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(255, 107, 107, 0.3);
  color: white;
}

/* ===================================
   Sections
   =================================== */

.section {
  padding: var(--spacing-section) 2rem;
  max-width: var(--container-width);
  margin: 0 auto;
}

.section-alt {
  background: var(--color-background-alt);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

/* ===================================
   Feature Grid
   =================================== */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--color-background);
  padding: 2rem;
  border-radius: 0.75rem;
  border: 1px solid var(--color-border);
  transition: var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  border-color: var(--color-accent);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  display: block;
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  color: var(--color-primary);
}

.feature-card p {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ===================================
   Page Content
   =================================== */

.page-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.page-title {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 3px solid var(--color-accent);
}

.page-content {
  font-size: 1.125rem;
}

.page-content ul, .page-content ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

.page-content li {
  margin-bottom: 0.5rem;
}

/* ===================================
   Code Blocks
   =================================== */

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-background-alt);
  padding: 0.2em 0.4em;
  border-radius: 0.25rem;
  color: var(--color-accent);
}

pre {
  background: var(--color-code-bg);
  padding: 1.5rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  position: relative;
}

pre code {
  background: none;
  color: #e2e8f0;
  padding: 0;
}

.copy-button {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  cursor: pointer;
  font-size: 0.875rem;
  transition: var(--transition-smooth);
}

.copy-button:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ===================================
   Tables
   =================================== */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

th {
  background: var(--color-background-alt);
  font-weight: 600;
  color: var(--color-primary);
}

tr:hover {
  background: var(--color-background-alt);
}

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

.site-footer {
  background: var(--color-primary);
  color: white;
  padding: 3rem 2rem 2rem;
  margin-top: 4rem;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  text-align: center;
}

.footer-content p {
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
}

.footer-links a {
  color: white;
  opacity: 0.9;
  transition: var(--transition-smooth);
}

.footer-links a:hover {
  opacity: 1;
  color: var(--color-accent);
}

.separator {
  opacity: 0.5;
}

.footer-note {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 0.875rem;
  opacity: 0.7;
}

.footer-note a {
  color: white;
}

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

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
  .main-nav {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-background);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
  }

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

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

  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .hero {
    padding: 4rem 1.5rem;
  }

  .section {
    padding: 3rem 1.5rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .page-container {
    padding: 3rem 1.5rem;
  }

  h1 {
    font-size: 2.5rem;
  }

  h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .header-container {
    padding: 1rem 1.5rem;
  }

  .site-title a {
    font-size: 1.25rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .cta-button {
    padding: 0.875rem 2rem;
    font-size: 1rem;
  }
}