/* Main Styles */
:root {
  /* Color system */
  --color-bg: #0a0e17;
  --color-bg-secondary: #0d1320;
  --color-surface: #141b29;
  --color-surface-elevated: #1c2635;
  
  --color-primary: #4f7df2;
  --color-primary-dark: #3b68d9;
  --color-primary-light: #6a93ff;
  
  --color-secondary: #6a3ce6;
  --color-secondary-light: #8355f9;
  
  --color-success: #36b37e;
  --color-warning: #ffab2b;
  --color-error: #ef4444;
  
  --color-text: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.8);
  --color-text-tertiary: rgba(255, 255, 255, 0.6);
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 5rem;
  
  /* Container */
  --container-width: 1280px;
  --container-padding: var(--space-4);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
}

/* Base Styles */
body {
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

/* Background Effects */
.chart-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 35%, rgba(79, 125, 242, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 75% 60%, rgba(106, 60, 230, 0.08) 0%, transparent 50%);
  z-index: -1;
  pointer-events: none;
}

/* Typography */
h1 {
  font-size: 3.5rem;
  margin-bottom: var(--space-4);
  line-height: 1.1;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: var(--space-3);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-2);
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 14, 23, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  z-index: 100;
  padding: var(--space-3) 0;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.logo-accent {
  color: var(--color-primary);
}

.main-nav ul {
  display: flex;
  gap: var(--space-4);
}

.main-nav a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.main-nav a:hover {
  color: var(--color-text);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(79, 125, 242, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.15);
}

.btn-outline {
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text);
}

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

/* Hero Section */
.hero {
  padding: calc(var(--space-8) * 2) 0 var(--space-8);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  max-width: 90%;
}

.hero-cta {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.hero-stats {
  display: flex;
  gap: var(--space-5);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.stat-value .accent {
  color: var(--color-primary);
  margin-left: 2px;
}

.stat-label {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

/* API Terminal */
.api-terminal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.terminal-header {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--space-2);
  display: flex;
  gap: var(--space-1);
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
}

.terminal-body {
  padding: var(--space-4);
  font-family: monospace;
  font-size: 0.9rem;
}

.code-line {
  margin-bottom: var(--space-2);
  opacity: 0;
  animation: fadeIn 0.5s forwards;
}

.code-line:nth-child(1) { animation-delay: 0.2s; }
.code-line:nth-child(2) { animation-delay: 0.4s; }
.code-line:nth-child(3) { animation-delay: 0.6s; }
.code-line:nth-child(4) { animation-delay: 0.8s; }
.code-line:nth-child(5) { animation-delay: 1s; }

.code-comment {
  color: var(--color-text-tertiary);
}

/* Features Section */
.features {
  padding: var(--space-8) 0;
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-6);
}

.section-header p {
  color: var(--color-text-secondary);
  font-size: 1.125rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.feature-card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.08);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  opacity: 0.9;
}

/* API Section */
.api-section {
  padding: var(--space-8) 0;
}

.section-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: center;
}

.api-features {
  margin-top: var(--space-4);
}

.api-features li {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.api-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.8;
  flex-shrink: 0;
}

.api-features h4 {
  margin-bottom: var(--space-1);
  color: var(--color-text);
}

.api-features p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* API Demo */
.api-demo {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.endpoint {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
  padding: var(--space-2);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
}

.method {
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}

.method.get {
  background: var(--color-success);
  color: var(--color-text);
}

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

.path {
  font-family: monospace;
  color: var(--color-text-secondary);
}

/* Performance Section */
.performance {
  padding: var(--space-8) 0;
}

.metrics-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.metric-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.time-period {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

/* Accuracy Chart */
.accuracy-chart {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.accuracy-bar {
  height: 32px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

.accuracy-bar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: var(--percentage);
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  animation: growWidth 1.5s ease-out forwards;
}

.accuracy-label {
  position: absolute;
  left: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text);
  font-size: 0.875rem;
  z-index: 1;
}

.accuracy-value {
  position: absolute;
  right: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 1;
}

/* Performance Stats */
.performance-stats {
  display: flex;
  justify-content: space-around;
  padding: var(--space-4) 0;
}

.stat-circle {
  position: relative;
  width: 120px;
  height: 120px;
}

.circle-progress {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: conic-gradient(
    var(--color-primary) calc(var(--progress) * 3.6deg),
    rgba(255, 255, 255, 0.1) 0deg
  );
}

.circle-progress::before {
  content: '';
  position: absolute;
  top: 10%;
  left: 10%;
  right: 10%;
  bottom: 10%;
  border-radius: 50%;
  background: var(--color-surface);
}

.progress-value {
  position: relative;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.progress-label {
  position: relative;
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
}

/* CTA Section */
.cta-section {
  padding: var(--space-8) 0;
  background: linear-gradient(180deg, 
    rgba(79, 125, 242, 0.1) 0%,
    rgba(106, 60, 230, 0.1) 100%
  );
}

.cta-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.cta-form {
  margin-top: var(--space-5);
  display: grid;
  gap: var(--space-3);
}

.form-group input,
.form-group select {
  width: 100%;
  padding: var(--space-3);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-text);
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--color-primary);
}

/* Footer */
.footer {
  padding: var(--space-8) 0 var(--space-4);
  background: var(--color-bg-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.footer-brand p {
  color: var(--color-text-secondary);
  margin: var(--space-3) 0;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.footer-col h4 {
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.footer-col ul li {
  margin-bottom: var(--space-2);
}

.footer-col a {
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  color: var(--color-text-tertiary);
  font-size: 0.875rem;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes growWidth {
  from {
    width: 0;
  }
  to {
    width: var(--percentage);
  }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .section-split {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .metrics-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero .container {
    grid-template-columns: 1fr;
  }
  
  .main-nav {
    display: none;
  }
  
  .header-cta {
    display: none;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-stats {
    flex-wrap: wrap;
  }
  
  .stat-item {
    width: 50%;
  }
  
  .footer-links {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--space-2);
  }
}