/* ===================================
   CSS Variables & Design Tokens
   =================================== */
:root {
  /* Colors - Black, Grey, Red palette */
  --color-black: #000000;
  --color-grey-900: #1a1a1a;
  --color-grey-800: #2d2d2d;
  --color-grey-700: #404040;
  --color-grey-600: #666666;
  --color-grey-500: #808080;
  --color-grey-400: #999999;
  --color-grey-300: #cccccc;
  --color-grey-200: #e6e6e6;
  --color-grey-100: #f5f5f5;
  --color-white: #ffffff;
  --color-red: #cc0000;
  --color-red-dark: #990000;
  --color-red-light: #ff3333;

  /* Typography */
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  
  /* Layout */
  --container-max-width: 1280px;
  --header-height: 64px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-grey-900);
  background-color: var(--color-white);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-mono);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

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

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

code, pre {
  font-family: var(--font-mono);
}

code {
  background-color: var(--color-grey-100);
  padding: 0.125rem 0.375rem;
  font-size: 0.875rem;
}

pre {
  background-color: var(--color-grey-100);
  padding: var(--space-md);
  overflow-x: auto;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
}

ul, ol {
  margin-bottom: var(--space-md);
}

/* ===================================
   Layout Components
   =================================== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.main-content {
  min-height: calc(100vh - var(--header-height) - 200px);
  padding: var(--space-2xl) 0;
}

.page-content {
  max-width: 1024px;
  margin: 0 auto;
}

/* ===================================
   Header Component
   =================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background-color: var(--color-white);
  border-bottom: 2px solid var(--color-grey-200);
}

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

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.125rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--color-black);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
}

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

/* Navigation */
.nav-desktop {
  display: none;
  gap: var(--space-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.875rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  background-color: var(--color-grey-100);
  color: var(--color-red);
}

.nav-link.active {
  background-color: var(--color-grey-200);
  color: var(--color-black);
}

.nav-icon {
  font-size: 1rem;
}

/* Search */
.search-container {
  position: relative;
  display: none;
}

.search-input {
  width: 300px;
  padding: var(--space-xs) var(--space-sm);
  padding-left: 2.5rem;
  border: 2px solid var(--color-grey-200);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-black);
}

.search-icon {
  position: absolute;
  left: var(--space-sm);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  color: var(--color-grey-500);
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}

.hamburger {
  width: 24px;
  height: 2px;
  background-color: var(--color-black);
  position: relative;
  transition: all var(--transition-base);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--color-black);
  transition: all var(--transition-base);
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  bottom: -8px;
}

.mobile-menu-toggle.active .hamburger {
  background-color: transparent;
}

.mobile-menu-toggle.active .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.mobile-menu-toggle.active .hamburger::after {
  bottom: 0;
  transform: rotate(-45deg);
}

.nav-mobile {
  display: none;
  position: absolute;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-top: 2px solid var(--color-grey-200);
  border-bottom: 2px solid var(--color-grey-200);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  z-index: 999;
  padding: var(--space-md);
}

.nav-mobile.active {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.nav-link-mobile {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.nav-link-mobile:hover {
  background-color: var(--color-grey-100);
  color: var(--color-red);
}

/* ===================================
   Footer Component
   =================================== */
.footer {
  border-top: 2px solid var(--color-grey-200);
  padding: var(--space-xl) 0;
  margin-top: var(--space-3xl);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  align-items: center;
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-grey-600);
}

.footer-left,
.footer-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-title {
  font-family: var(--font-mono);
  font-weight: 600;
}

.footer-separator {
  color: var(--color-grey-400);
}

/* ===================================
   Page Components
   =================================== */
.page-header {
  margin-bottom: var(--space-2xl);
}

.page-title {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

.page-description {
  font-size: 1.125rem;
  color: var(--color-grey-600);
  line-height: 1.7;
}

.section {
  margin-bottom: var(--space-3xl);
}

.section-title {
  font-size: 2.25rem;
  margin-bottom: var(--space-lg);
}

.section-intro {
  font-size: 1rem;
  color: var(--color-grey-600);
  margin-bottom: var(--space-lg);
}

.section-text {
  color: var(--color-grey-700);
  margin-bottom: var(--space-lg);
}

/* ===================================
   Hero Section
   =================================== */
.hero-section {
  margin-bottom: var(--space-3xl);
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.hero-description {
  font-size: 1.25rem;
  color: var(--color-grey-600);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ===================================
   Button Components
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.btn-primary:hover {
  background-color: var(--color-red);
  border-color: var(--color-red);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-black);
  border-color: var(--color-grey-300);
}

.btn-secondary:hover {
  background-color: var(--color-grey-100);
  border-color: var(--color-black);
}

.btn-icon {
  font-size: 1.125rem;
}

/* ===================================
   Card Components
   =================================== */
.card {
  background-color: var(--color-white);
  border: 2px solid var(--color-grey-200);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.card-hover {
  transition: all var(--transition-base);
}

.card-hover:hover {
  border-color: var(--color-black);
  transform: translateY(-2px);
}

.card-highlight {
  border-color: var(--color-red);
  border-width: 2px;
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.card-title-large {
  font-size: 2rem;
  margin-bottom: var(--space-lg);
}

.card-description {
  color: var(--color-grey-600);
  line-height: 1.7;
}

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

/* ===================================
   Feature Components
   =================================== */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.feature-card {
  padding: var(--space-lg);
  border-left: 4px solid var(--color-black);
  background-color: var(--color-grey-100);
}

.feature-card-accent {
  border-left-color: var(--color-red);
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.feature-description {
  color: var(--color-grey-700);
  margin-bottom: var(--space-sm);
}

/* ===================================
   Documentation Links
   =================================== */
.doc-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.doc-link {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: var(--space-lg);
  border: 2px solid var(--color-grey-200);
  transition: all var(--transition-base);
}

.doc-link:hover {
  border-color: var(--color-black);
  background-color: var(--color-grey-100);
}

.doc-link-content {
  flex: 1;
}

.doc-link-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.doc-link-description {
  color: var(--color-grey-600);
  line-height: 1.6;
}

.doc-link-arrow {
  font-size: 1.5rem;
  color: var(--color-grey-400);
  margin-left: var(--space-md);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.doc-link:hover .doc-link-arrow {
  transform: translateX(4px);
  color: var(--color-red);
}

/* ===================================
   Quick Start Component
   =================================== */
.quick-start-card {
  background-color: var(--color-grey-100);
  border: 2px solid var(--color-grey-300);
  padding: var(--space-xl);
}

.quick-start-title {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.quick-start-intro {
  color: var(--color-grey-600);
  margin-bottom: var(--space-lg);
}

.quick-start-list {
  list-style: none;
  counter-reset: step;
}

.quick-start-list li {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  color: var(--color-grey-700);
}

.step-number {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-black);
  flex-shrink: 0;
}

/* ===================================
   Diagram Component
   =================================== */
.diagram-container {
  background-color: var(--color-grey-100);
  padding: var(--space-xl);
  overflow-x: auto;
}

.diagram {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-grey-900);
  white-space: pre;
  margin: 0;
}

/* ===================================
   Data Lists
   =================================== */
.data-list {
  list-style: none;
  margin-top: var(--space-md);
}

.data-list li {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.data-bullet {
  color: var(--color-black);
  flex-shrink: 0;
}

.data-bullet-accent {
  color: var(--color-red);
}

/* ===================================
   Backend Grid
   =================================== */
.backend-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

/* ===================================
   Security Components
   =================================== */
.security-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.security-card {
  padding: var(--space-lg);
  background-color: #fff5f5;
  border: 2px solid var(--color-red);
}

.security-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  color: var(--color-red-dark);
}

.security-description {
  color: var(--color-grey-700);
}

/* ===================================
   Code Block Components
   =================================== */
.code-section {
  margin-bottom: var(--space-2xl);
}

.code-section-title {
  font-size: 2rem;
  margin-bottom: var(--space-md);
}

.code-section-subtitle {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.code-section-description {
  color: var(--color-grey-600);
  margin-bottom: var(--space-md);
}

.code-block {
  background-color: var(--color-grey-100);
  border: 2px solid var(--color-grey-200);
  margin-bottom: var(--space-lg);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 2px solid var(--color-grey-200);
  background-color: var(--color-white);
}

.code-language {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-grey-600);
}

.copy-button {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background: none;
  border: 2px solid var(--color-grey-300);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-button:hover {
  background-color: var(--color-grey-100);
  border-color: var(--color-black);
}

.copy-button.copied {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.copy-icon {
  font-size: 1rem;
}

.code-content {
  padding: var(--space-lg);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.6;
  background: none;
}

.code-inline {
  background-color: var(--color-grey-100);
  padding: var(--space-md);
  margin-top: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

/* ===================================
   Tabs Component
   =================================== */
.tabs-container {
  margin-top: var(--space-xl);
}

.tabs-nav {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-bottom: 2px solid var(--color-grey-200);
  margin-bottom: var(--space-xl);
}

.tab-button {
  padding: var(--space-md);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-bottom: -2px;
}

.tab-button:hover {
  background-color: var(--color-grey-100);
}

.tab-button.active {
  border-bottom-color: var(--color-black);
  background-color: var(--color-grey-100);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ===================================
   Steps Components
   =================================== */
.steps-card {
  background-color: var(--color-grey-100);
  border: 2px solid var(--color-grey-300);
  padding: var(--space-lg);
}

.steps-list {
  list-style: none;
  counter-reset: step;
}

.steps-list > li {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.steps-list > li:last-child {
  margin-bottom: 0;
}

.field-list {
  list-style: none;
  margin-top: var(--space-sm);
  margin-left: var(--space-xl);
  font-size: 0.875rem;
}

.field-list li {
  margin-bottom: var(--space-xs);
}

/* ===================================
   Security Practices
   =================================== */
.security-practices {
  background-color: #fff5f5;
  border: 2px solid var(--color-red);
  padding: var(--space-lg);
}

.practices-list {
  list-style: none;
}

.practices-list li {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.practice-bullet {
  color: var(--color-red);
  flex-shrink: 0;
}

/* ===================================
   Benefits & Best Practices
   =================================== */
.benefits-list {
  list-style: none;
}

.benefits-list li {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.benefit-bullet {
  color: var(--color-red);
  flex-shrink: 0;
}

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

.practice-card {
  padding: var(--space-lg);
  border-left: 4px solid var(--color-red);
  background-color: var(--color-grey-100);
}

.practice-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.practice-description {
  color: var(--color-grey-700);
}

/* ===================================
   Build Steps
   =================================== */
.build-steps {
  list-style: none;
}

.build-steps li {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

/* ===================================
   Responsive Design
   =================================== */
@media (min-width: 768px) {
  .nav-desktop {
    display: flex;
  }
  
  .search-container {
    display: block;
  }
  
  .mobile-menu-toggle {
    display: none;
  }
  
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .backend-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .best-practices-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  
  .footer-left,
  .footer-right {
    justify-content: flex-start;
  }
}

@media (max-width: 767px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .page-title {
    font-size: 2.5rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
  
  .tabs-nav {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .tab-button {
    font-size: 0.875rem;
    padding: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
}