/* NEST Website - Main Styles */
/* Design: nest-eeg.org */

:root {
  /* Colors from .pen design */
  --bg-primary: #0A0A12;
  --bg-secondary: #0E0E18;
  --bg-tertiary: #08080F;
  --bg-card: #12121B;
  --bg-card-hover: #15152890;
  
  --text-primary: #FFFFFF;
  --text-secondary: #A0A0B0;
  --text-muted: #6B6B80;
  
  --accent-purple: #8B5CF6;
  --accent-indigo: #6366F1;
  --accent-violet: #A855F7;
  --accent-green: #22C55E;
  --accent-teal: #10B981;
  
  /* Fonts */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 60px;
  --spacing-4xl: 80px;
  --spacing-5xl: 100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-display);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

img {
  max-width: 100%;
  height: auto;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: 72px;
  letter-spacing: -2px;
}

h2 {
  font-size: 48px;
}

h3 {
  font-size: 36px;
}

h4 {
  font-size: 28px;
}

h5 {
  font-size: 20px;
}

.text-gradient {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mono {
  font-family: var(--font-mono);
}

.label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent-purple);
}

/* Layout */
.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 80px;
}

.section {
  padding: 100px 80px;
}

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

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

.flex {
  display: flex;
}

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

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm { gap: 8px; }
.gap-md { gap: 16px; }
.gap-lg { gap: 24px; }
.gap-xl { gap: 32px; }
.gap-2xl { gap: 40px; }
.gap-3xl { gap: 60px; }

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

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 18, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  padding: 0 80px;
  max-width: 1440px;
  margin: 0 auto;
}

.logo {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-link {
  font-size: 15px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-indigo));
  color: var(--text-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(139, 92, 246, 0.3);
}

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

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

.btn-lg {
  padding: 16px 32px;
  font-size: 16px;
  border-radius: 12px;
}

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

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

/* Hero Section */
.hero {
  padding-top: 180px;
  padding-bottom: 100px;
  text-align: center;
}

.hero h1 {
  max-width: 900px;
  margin: 0 auto 40px;
  line-height: 1.1;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 40px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 50px;
}

.stats-row {
  display: flex;
  justify-content: center;
  gap: 60px;
  padding-top: 30px;
}

.stat {
  text-align: center;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
}

.stat-value.purple { color: var(--accent-purple); }
.stat-value.indigo { color: var(--accent-indigo); }
.stat-value.violet { color: var(--accent-violet); }

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* How It Works Section */
.steps-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.step-card {
  background: rgba(21, 21, 40, 0.9);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  width: 280px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.step-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 60px rgba(139, 92, 246, 0.1);
}

.step-icon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(99, 102, 241, 0.2));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 36px;
}

.step-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.step-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.step-arrow {
  font-size: 32px;
  color: var(--accent-purple);
}

/* Demo Section */
.demo-container {
  background: var(--bg-card);
  border-radius: 24px;
  padding: 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
}

.demo-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.demo-panel-title {
  font-size: 20px;
  font-weight: 600;
}

.demo-visualization {
  background: #1A1A2E;
  border-radius: 12px;
  height: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.demo-visualization-icon {
  font-size: 48px;
}

.demo-visualization-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--accent-indigo);
}

.demo-visualization-desc {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}

.demo-output {
  background: var(--bg-primary);
  border-radius: 12px;
  padding: 24px;
  min-height: 200px;
}

.demo-output-text {
  font-family: var(--font-mono);
  font-size: 18px;
  color: #C4B5FD;
  line-height: 1.6;
}

.demo-controls {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 24px;
}

/* Features Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1100px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 32px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 60px rgba(139, 92, 246, 0.1);
}

.feature-icon {
  font-size: 32px;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Download Section */
.download-section {
  text-align: center;
}

.code-block {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: 32px;
  max-width: 700px;
  margin: 32px auto;
  text-align: left;
}

.code-block pre {
  font-family: var(--font-mono);
  font-size: 14px;
  color: #C4B5FD;
  line-height: 1.8;
  overflow-x: auto;
}

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

.code-block .command {
  color: var(--accent-teal);
}

.download-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
}

/* Footer */
.footer {
  background: #080810;
  padding: 60px 80px;
}

.footer-inner {
  max-width: 1440px;
  margin: 0 auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 80px;
}

.footer-column h5 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-column ul {
  list-style: none;
}

.footer-column li {
  margin-bottom: 12px;
}

.footer-column a {
  font-size: 14px;
  color: var(--text-secondary);
}

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

.footer-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin-bottom: 40px;
}

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

.footer-copyright {
  font-size: 14px;
  color: var(--text-muted);
}

.footer-social {
  display: flex;
  gap: 20px;
}

.footer-social a {
  color: var(--text-secondary);
  font-size: 20px;
}

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

/* Docs Sidebar */
.docs-layout {
  display: flex;
  min-height: calc(100vh - 80px);
  margin-top: 80px;
}

.docs-sidebar {
  width: 280px;
  background: var(--bg-tertiary);
  padding: 32px 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  position: fixed;
  height: calc(100vh - 80px);
  overflow-y: auto;
}

.docs-sidebar-section {
  margin-bottom: 32px;
}

.docs-sidebar-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.docs-sidebar-links {
  list-style: none;
}

.docs-sidebar-links li {
  margin-bottom: 8px;
}

.docs-sidebar-links a {
  font-size: 14px;
  color: var(--text-secondary);
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.docs-sidebar-links a:hover,
.docs-sidebar-links a.active {
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent-purple);
}

.docs-content {
  flex: 1;
  margin-left: 280px;
  padding: 48px 80px;
  max-width: calc(100% - 280px);
}

.docs-content h1 {
  font-size: 48px;
  margin-bottom: 24px;
}

.docs-content p {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.docs-content h2 {
  font-size: 28px;
  margin-top: 48px;
  margin-bottom: 16px;
}

.docs-content h3 {
  font-size: 20px;
  margin-top: 32px;
  margin-bottom: 12px;
}

.docs-content ul {
  margin-bottom: 24px;
  padding-left: 24px;
}

.docs-content li {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

.docs-content code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: var(--bg-primary);
  padding: 2px 8px;
  border-radius: 4px;
  color: #C4B5FD;
}

.docs-content pre {
  background: var(--bg-primary);
  border-radius: 12px;
  padding: 24px;
  overflow-x: auto;
  margin-bottom: 24px;
}

.docs-content pre code {
  padding: 0;
  background: transparent;
}

.docs-nav-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.docs-nav-btn {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.docs-nav-btn-label {
  font-size: 12px;
  color: var(--text-muted);
}

.docs-nav-btn-title {
  font-size: 16px;
  color: var(--accent-purple);
}

/* Responsive */
@media (max-width: 1200px) {
  .container, .section, .header-inner {
    padding-left: 40px;
    padding-right: 40px;
  }
  
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 968px) {
  h1 { font-size: 48px; }
  h2 { font-size: 36px; }
  
  .nav { display: none; }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .demo-container {
    grid-template-columns: 1fr;
  }
  
  .steps-container {
    flex-direction: column;
  }
  
  .step-arrow {
    transform: rotate(90deg);
  }
  
  .stats-row {
    flex-direction: column;
    gap: 30px;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .docs-sidebar {
    display: none;
  }
  
  .docs-content {
    margin-left: 0;
    max-width: 100%;
    padding: 24px;
  }
  
  .footer-top {
    flex-direction: column;
    gap: 40px;
  }
  
  .footer-links {
    flex-wrap: wrap;
    gap: 40px;
  }
}

@media (max-width: 640px) {
  h1 { font-size: 36px; letter-spacing: -1px; }
  h2 { font-size: 28px; }
  
  .container, .section, .header-inner, .footer {
    padding-left: 20px;
    padding-right: 20px;
  }
  
  .section {
    padding-top: 60px;
    padding-bottom: 60px;
  }
  
  .hero {
    padding-top: 120px;
  }
  
  .hero-buttons {
    flex-direction: column;
  }
  
  .btn-lg {
    width: 100%;
  }
  
  .download-buttons {
    flex-direction: column;
    max-width: 300px;
    margin: 0 auto;
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease-out forwards;
}

.animate-delay-100 { animation-delay: 0.1s; }
.animate-delay-200 { animation-delay: 0.2s; }
.animate-delay-300 { animation-delay: 0.3s; }