/* ========================================
   Apex Data Center & Cloud Architecture
   Digital Industrial Design System
   ======================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600;700&family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ========================================
   CSS Variables - Color Palette
   ======================================== */
:root {
  /* Primary Colors - Digital Industrial */
  --color-carbon-black: #0D0F12;
  --color-server-blue: #007BFF;
  --color-running-green: #00FF41;
  --color-titanium-silver: #B0B3B8;
  
  /* Extended Palette */
  --color-deep-navy: #1A1F2E;
  --color-dark-slate: #2D3142;
  --color-light-gray: #E8E9EB;
  --color-white: #FFFFFF;
  --color-accent-cyan: #00D4FF;
  --color-accent-purple: #7C3AED;
  --color-warning-orange: #FF9500;
  --color-success-green: #10B981;
  
  /* Semantic Colors */
  --bg-primary: var(--color-carbon-black);
  --bg-secondary: var(--color-deep-navy);
  --bg-tertiary: var(--color-dark-slate);
  --text-primary: var(--color-white);
  --text-secondary: var(--color-titanium-silver);
  --text-accent: var(--color-server-blue);
  --border-color: rgba(176, 179, 184, 0.2);
  --border-color-light: rgba(176, 179, 184, 0.1);
  
  /* Typography */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  
  /* Font Sizes */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-lg: 1.125rem;
  --fs-xl: 1.25rem;
  --fs-2xl: 1.5rem;
  --fs-3xl: 1.875rem;
  --fs-4xl: 2.25rem;
  --fs-5xl: 3rem;
  --fs-6xl: 3.75rem;
  --fs-7xl: 4.5rem;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 2.5rem;
  --spacing-3xl: 3rem;
  --spacing-4xl: 4rem;
  --spacing-5xl: 5rem;
  --spacing-6xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 20px rgba(0, 123, 255, 0.3);
  --shadow-glow-green: 0 0 20px rgba(0, 255, 65, 0.2);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1070;
}

/* ========================================
   Global Styles
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

/* ========================================
   Typography
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--fs-6xl);
  font-weight: 800;
}

h2 {
  font-size: var(--fs-5xl);
  font-weight: 700;
}

h3 {
  font-size: var(--fs-4xl);
  font-weight: 700;
}

h4 {
  font-size: var(--fs-3xl);
  font-weight: 600;
}

h5 {
  font-size: var(--fs-2xl);
  font-weight: 600;
}

h6 {
  font-size: var(--fs-xl);
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
  line-height: 1.8;
}

a {
  color: var(--color-server-blue);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--bg-tertiary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  color: var(--color-running-green);
}

pre {
  background-color: var(--bg-tertiary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
  border: 1px solid var(--border-color);
}

pre code {
  background-color: transparent;
  padding: 0;
  color: var(--color-running-green);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-lg);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  gap: var(--spacing-sm);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
  background-color: var(--color-server-blue);
  color: var(--text-primary);
  border: 2px solid var(--color-server-blue);
}

.btn-primary:hover:not(:disabled) {
  background-color: transparent;
  color: var(--color-server-blue);
  box-shadow: var(--shadow-glow);
}

/* Secondary Button */
.btn-secondary {
  background-color: transparent;
  color: var(--color-server-blue);
  border: 2px solid var(--color-server-blue);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-server-blue);
  color: var(--text-primary);
  box-shadow: var(--shadow-glow);
}

/* Accent Button (Green) */
.btn-accent {
  background-color: var(--color-running-green);
  color: var(--bg-primary);
  border: 2px solid var(--color-running-green);
  font-weight: 700;
}

.btn-accent:hover:not(:disabled) {
  background-color: transparent;
  color: var(--color-running-green);
  box-shadow: var(--shadow-glow-green);
}

/* Button Sizes */
.btn-sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--fs-sm);
}

.btn-lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--fs-lg);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(10px);
  background-color: rgba(26, 31, 46, 0.95);
}

.navbar-brand {
  font-family: var(--font-display);
  font-size: var(--fs-2xl);
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-brand:hover {
  color: var(--color-server-blue);
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-base);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-server-blue);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-server-blue);
  border-radius: 1px;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(0, 123, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0, 255, 65, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: var(--spacing-4xl) var(--spacing-xl);
}

.hero-title {
  font-size: var(--fs-7xl);
  font-weight: 800;
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--color-server-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--fs-2xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  line-height: 1.5;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-3xl);
}

/* ========================================
   Sections
   ======================================== */
.section {
  padding: var(--spacing-6xl) var(--spacing-xl);
  border-top: 1px solid var(--border-color);
}

.section-title {
  font-size: var(--fs-5xl);
  margin-bottom: var(--spacing-2xl);
  text-align: center;
}

.section-subtitle {
  font-size: var(--fs-xl);
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ========================================
   Container
   ======================================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.container-sm {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.container-lg {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

/* ========================================
   Grid System
   ======================================== */
.grid {
  display: grid;
  gap: var(--spacing-2xl);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Cards
   ======================================== */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-server-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  border-color: var(--color-server-blue);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

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

.card-title {
  font-size: var(--fs-2xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.card-text {
  color: var(--text-secondary);
  line-height: 1.8;
}

.card-icon {
  font-size: var(--fs-4xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-server-blue);
}

/* ========================================
   Feature Boxes
   ======================================== */
.feature-box {
  background: linear-gradient(135deg, rgba(0, 123, 255, 0.05) 0%, rgba(0, 255, 65, 0.02) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
  transition: all var(--transition-base);
}

.feature-box:hover {
  border-color: var(--color-server-blue);
  background: linear-gradient(135deg, rgba(0, 123, 255, 0.1) 0%, rgba(0, 255, 65, 0.05) 100%);
}

.feature-icon {
  font-size: var(--fs-5xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-server-blue);
}

.feature-title {
  font-size: var(--fs-2xl);
  margin-bottom: var(--spacing-md);
}

.feature-text {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ========================================
   Stats Section
   ======================================== */
.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-mono);
  font-size: var(--fs-6xl);
  font-weight: 800;
  color: var(--color-server-blue);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ========================================
   Tables
   ======================================== */
.table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
}

thead {
  background-color: var(--bg-tertiary);
  border-bottom: 2px solid var(--color-server-blue);
}

th {
  padding: var(--spacing-lg);
  text-align: left;
  color: var(--color-server-blue);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

td {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

tbody tr:hover {
  background-color: rgba(0, 123, 255, 0.05);
}

/* ========================================
   Forms
   ======================================== */
.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-server-blue);
  box-shadow: var(--shadow-glow);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* ========================================
   Footer
   ======================================== */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-4xl) var(--spacing-xl);
  margin-top: var(--spacing-6xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
}

.footer-section h4 {
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
}

.footer-section ul {
  list-style: none;
  padding: 0;
}

.footer-section li {
  margin-bottom: var(--spacing-md);
}

.footer-section a {
  color: var(--text-secondary);
  transition: color var(--transition-base);
}

.footer-section a:hover {
  color: var(--color-server-blue);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-2xl);
  text-align: center;
  color: var(--text-secondary);
  font-size: var(--fs-sm);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(0, 123, 255, 0.3);
  }
  50% {
    box-shadow: 0 0 40px rgba(0, 123, 255, 0.6);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-down {
  animation: fadeInDown 0.6s ease-out;
}

.animate-fade-in-left {
  animation: fadeInLeft 0.6s ease-out;
}

.animate-fade-in-right {
  animation: fadeInRight 0.6s ease-out;
}

.animate-glow {
  animation: glow 2s ease-in-out infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-float {
  animation: float 3s ease-in-out infinite;
}

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

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

.text-secondary {
  color: var(--text-secondary);
}

.text-accent {
  color: var(--color-server-blue);
}

.text-green {
  color: var(--color-running-green);
}

.bg-primary {
  background-color: var(--bg-primary);
}

.bg-secondary {
  background-color: var(--bg-secondary);
}

.bg-tertiary {
  background-color: var(--bg-tertiary);
}

.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-2xl); }
.mt-4 { margin-top: var(--spacing-3xl); }
.mt-5 { margin-top: var(--spacing-4xl); }
.mt-6 { margin-top: var(--spacing-5xl); }

.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-2xl); }
.mb-4 { margin-bottom: var(--spacing-3xl); }
.mb-5 { margin-bottom: var(--spacing-4xl); }
.mb-6 { margin-bottom: var(--spacing-5xl); }

.pt-1 { padding-top: var(--spacing-md); }
.pt-2 { padding-top: var(--spacing-lg); }
.pt-3 { padding-top: var(--spacing-2xl); }
.pt-4 { padding-top: var(--spacing-3xl); }
.pt-5 { padding-top: var(--spacing-4xl); }
.pt-6 { padding-top: var(--spacing-5xl); }

.pb-1 { padding-bottom: var(--spacing-md); }
.pb-2 { padding-bottom: var(--spacing-lg); }
.pb-3 { padding-bottom: var(--spacing-2xl); }
.pb-4 { padding-bottom: var(--spacing-3xl); }
.pb-5 { padding-bottom: var(--spacing-4xl); }
.pb-6 { padding-bottom: var(--spacing-5xl); }

.flex {
  display: flex;
}

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

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

.flex-col {
  flex-direction: column;
}

.gap-1 { gap: var(--spacing-md); }
.gap-2 { gap: var(--spacing-lg); }
.gap-3 { gap: var(--spacing-2xl); }
.gap-4 { gap: var(--spacing-3xl); }

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
  h1 {
    font-size: var(--fs-4xl);
  }
  
  h2 {
    font-size: var(--fs-3xl);
  }
  
  h3 {
    font-size: var(--fs-2xl);
  }
  
  .hero-title {
    font-size: var(--fs-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--fs-lg);
  }
  
  .section {
    padding: var(--spacing-4xl) var(--spacing-lg);
  }
  
  .container,
  .container-sm,
  .container-lg {
    padding: 0 var(--spacing-lg);
  }
  
  .navbar-nav {
    gap: var(--spacing-lg);
  }
  
  .hero-cta {
    flex-direction: column;
    align-items: center;
  }
  
  .hero-cta .btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: var(--fs-3xl);
  }
  
  h2 {
    font-size: var(--fs-2xl);
  }
  
  .hero-title {
    font-size: var(--fs-2xl);
  }
  
  .hero-subtitle {
    font-size: var(--fs-base);
  }
  
  .section {
    padding: var(--spacing-3xl) var(--spacing-md);
  }
  
  .container,
  .container-sm,
  .container-lg {
    padding: 0 var(--spacing-md);
  }
  
  .navbar-nav {
    gap: var(--spacing-md);
  }
  
  .card {
    padding: var(--spacing-lg);
  }
  
  table {
    font-size: var(--fs-xs);
  }
  
  th, td {
    padding: var(--spacing-md);
  }
}