/* ===========================================
   TECHDOCS - CLEAN & PROFESSIONAL
   Modern Documentation Design
   =========================================== */

:root {
  /* Colors - Clean & Professional */
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-light: #60A5FA;
  
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;
  
  /* Neutral Colors */
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-text-lighter: #9CA3AF;
  
  --color-bg: #FFFFFF;
  --color-bg-secondary: #F9FAFB;
  --color-bg-tertiary: #F3F4F6;
  
  --color-border: #E5E7EB;
  --color-border-light: #F3F4F6;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Layout */
  --sidebar-width: 280px;
  --header-height: 64px;
  --content-max-width: 800px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  
  /* Radius */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Transitions */
  --transition: 200ms ease;
}

/* ===========================================
   BASE STYLES
   =========================================== */

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

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

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

/* ===========================================
   HEADER
   =========================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
}

.logo-icon {
  width: 32px;
  height: 32px;
  stroke-width: 2.5px;
  color: var(--color-primary);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translateY(7px);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translateY(-7px);
}

/* ===========================================
   LAYOUT
   =========================================== */

.layout {
  display: flex;
  margin-top: var(--header-height);
}

/* ===========================================
   SIDEBAR
   =========================================== */

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: var(--sidebar-width);
  height: calc(100vh - var(--header-height));
  background: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  z-index: 90;
  transition: transform var(--transition);
}

.sidebar-content {
  padding: var(--space-6);
}

/* Search */
.search-box {
  position: relative;
  margin-bottom: var(--space-6);
}

.search-icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  color: var(--color-text-lighter);
  stroke-width: 2px;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) calc(var(--space-4) + 32px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 0.9375rem;
  font-family: var(--font-sans);
  background: var(--color-bg);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Navigation */
.nav-section {
  margin-bottom: var(--space-8);
}

.nav-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-lighter);
  margin-bottom: var(--space-3);
}

.nav-link {
  display: block;
  padding: var(--space-2) var(--space-4);
  color: var(--color-text-light);
  text-decoration: none;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  transition: var(--transition);
  margin-bottom: var(--space-1);
}

.nav-link:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-text);
}

.nav-link.active {
  background: var(--color-primary);
  color: white;
  font-weight: 500;
}

/* ===========================================
   MAIN CONTENT
   =========================================== */

.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: calc(100vh - var(--header-height));
}

.content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}

/* ===========================================
   SECTIONS
   =========================================== */

.section {
  margin-bottom: var(--space-16);
  scroll-margin-top: calc(var(--header-height) + var(--space-6));
}

.section-header {
  margin-bottom: var(--space-8);
}

.section-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.2;
}

.section-description {
  font-size: 1.125rem;
  color: var(--color-text-light);
  margin: 0;
}

/* ===========================================
   CARD
   =========================================== */

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-8) 0 var(--space-4) 0;
}

.card h2:first-child {
  margin-top: 0;
}

.card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  margin: var(--space-6) 0 var(--space-3) 0;
}

.card p {
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

.card code {
  padding: var(--space-1) var(--space-2);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.875em;
  color: var(--color-primary-dark);
}

/* ===========================================
   CODE BLOCKS
   =========================================== */

.code-block {
  margin: var(--space-6) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-secondary);
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-tertiary);
  border-bottom: 1px solid var(--color-border);
}

.code-lang {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-light);
}

.code-copy {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-family: var(--font-sans);
  color: var(--color-text-light);
  cursor: pointer;
  transition: var(--transition);
}

.code-copy:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.code-copy svg {
  width: 16px;
  height: 16px;
  stroke-width: 2px;
}

.code-copy.copied {
  background: var(--color-success);
  color: white;
  border-color: var(--color-success);
}

.code-block pre {
  margin: 0;
  padding: var(--space-5);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text);
}

.code-block pre::-webkit-scrollbar {
  height: 8px;
}

.code-block pre::-webkit-scrollbar-track {
  background: var(--color-bg-tertiary);
}

.code-block pre::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 4px;
}

.code-block pre::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-lighter);
}

/* ===========================================
   ALERTS
   =========================================== */

.alert {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  margin: var(--space-6) 0;
  border-left: 4px solid;
}

.alert-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  stroke-width: 2px;
}

.alert strong {
  display: block;
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.alert-info {
  background: rgba(59, 130, 246, 0.1);
  border-left-color: var(--color-info);
  color: var(--color-text);
}

.alert-info .alert-icon {
  color: var(--color-info);
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border-left-color: var(--color-warning);
  color: var(--color-text);
}

.alert-warning .alert-icon {
  color: var(--color-warning);
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border-left-color: var(--color-success);
  color: var(--color-text);
}

.alert-success .alert-icon {
  color: var(--color-success);
}

/* ===========================================
   FEATURES
   =========================================== */

.features {
  display: grid;
  gap: var(--space-5);
  margin: var(--space-6) 0;
}

.feature-item {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.feature-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.feature-item h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-2) 0;
}

.feature-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin: 0;
}

/* ===========================================
   PRACTICES GRID
   =========================================== */

.practices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-5);
  margin: var(--space-6) 0;
}

.practice-card {
  padding: var(--space-6);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

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

.practice-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 var(--space-3) 0;
}

.practice-card p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin: 0;
  line-height: 1.6;
}

/* ===========================================
   BACK TO TOP
   =========================================== */

.back-to-top {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-xl);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  z-index: 50;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
  stroke-width: 2.5px;
}

/* ===========================================
   RESPONSIVE
   =========================================== */

@media (max-width: 1024px) {
  :root {
    --sidebar-width: 260px;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: flex;
  }
  
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.active {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }
  
  .main {
    margin-left: 0;
  }
  
  .content {
    padding: var(--space-8) var(--space-4);
  }
  
  .section-header h1 {
    font-size: 2rem;
  }
  
  .card {
    padding: var(--space-6);
  }
  
  .features {
    grid-template-columns: 1fr;
  }
  
  .practices-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .section-header h1 {
    font-size: 1.75rem;
  }
  
  .card {
    padding: var(--space-5);
  }
  
  .feature-item {
    flex-direction: column;
  }
  
  .back-to-top {
    width: 44px;
    height: 44px;
    bottom: var(--space-4);
    right: var(--space-4);
  }
}

/* ===========================================
   SCROLLBAR
   =========================================== */

::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 6px;
  border: 3px solid var(--color-bg-secondary);
}

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

/* ===========================================
   FOCUS STATES
   =========================================== */

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===========================================
   PRINT
   =========================================== */

@media print {
  .header,
  .sidebar,
  .back-to-top,
  .code-copy {
    display: none !important;
  }
  
  .main {
    margin-left: 0;
  }
  
  .section {
    break-inside: avoid;
  }
}