/* --- Design System & CSS Variables --- */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Space Grotesk', var(--font-sans);
  --font-mono: 'Fira Code', 'JetBrains Mono', monospace;

  /* Colors */
  --bg-color: #0a0b0e;
  --bg-grid: rgba(255, 85, 0, 0.02);
  --color-primary: #ff5500;
  --color-primary-rgb: 255, 85, 0;
  --color-secondary: #00f0ff;
  --color-secondary-rgb: 0, 240, 255;
  --color-amber: #ffaa00;
  --color-amber-rgb: 255, 170, 0;
  
  --text-primary: #f1f2f6;
  --text-secondary: #9aa0b0;
  --text-muted: #626875;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(255, 85, 0, 0.15);
  --border-glow-cyan: rgba(0, 240, 255, 0.15);
  
  /* Glassmorphism */
  --glass-bg: rgba(15, 17, 23, 0.7);
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-blur: 16px;

  /* Spacing */
  --container-width: 1200px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Base Reset & Defaults --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* --- Spark Background Canvas --- */
#spark-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* Grid background overlay */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    linear-gradient(to right, var(--bg-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--bg-grid) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -2;
  pointer-events: none;
}

/* --- Scrollbar styling --- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

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

/* --- Utility Components --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 85, 0, 0.08);
  border: 1px solid rgba(255, 85, 0, 0.2);
  border-radius: 9999px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-primary);
  width: fit-content;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-primary);
  box-shadow: 0 0 8px var(--color-primary);
}

.badge-dot.cyan {
  background-color: var(--color-secondary);
  box-shadow: 0 0 8px var(--color-secondary);
}

.badge-dot.cyan + .badge-text {
  color: var(--color-secondary);
}

.badge:has(.cyan) {
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.2);
}

.gradient-text {
  background: linear-gradient(135deg, #ff8800 0%, #ff3300 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.highlight-orange {
  color: var(--color-primary);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  border: 1px solid var(--color-primary);
  box-shadow: 0 4px 20px rgba(255, 85, 0, 0.25);
}

.btn-primary:hover {
  background: #ff661a;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 85, 0, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  border-bottom: 1px solid var(--glass-border);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.nav-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  color: var(--color-primary);
  filter: drop-shadow(0 0 8px rgba(255, 85, 0, 0.5));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.9rem !important;
}

.github-link:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--text-secondary);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 22px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.mobile-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-normal);
}

/* --- Hero Section --- */
.hero {
  padding: 160px 24px 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-container {
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.1;
}

.hero-description {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 700px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 12px;
}

/* --- Terminal Section --- */
.terminal-section {
  padding: 60px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
  max-width: 650px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.terminal-wrapper {
  width: 100%;
  max-width: 850px;
  background: var(--glass-bg);
  border: 1px solid var(--border-glow);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4), 0 0 20px rgba(255, 85, 0, 0.05);
  border-radius: 12px;
  overflow: hidden;
  backdrop-filter: blur(var(--glass-blur));
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.terminal-wrapper:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(255, 85, 0, 0.15);
}

.terminal-header {
  background: rgba(0, 0, 0, 0.4);
  border-bottom: 1px solid var(--glass-border);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.terminal-controls {
  display: flex;
  gap: 8px;
}

.control {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: inline-block;
}

.control.close { background-color: #ff5f56; }
.control.minimize { background-color: #ffbd2e; }
.control.expand { background-color: #27c93f; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}

.terminal-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--color-secondary);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  box-shadow: 0 0 8px var(--color-secondary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 0.3; }
  50% { opacity: 1; }
  100% { opacity: 0.3; }
}

.terminal-body {
  padding: 24px;
  height: 380px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #cdd6f4;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.terminal-line {
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}

.terminal-line.output-success {
  color: #a6e3a1;
}

.terminal-line.output-info {
  color: var(--color-secondary);
}

.terminal-line.output-warning {
  color: #f9e2af;
}

.terminal-line.output-error {
  color: #f38ba8;
}

.terminal-line.output-spark {
  color: var(--color-amber);
}

.terminal-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
}

.prompt {
  color: var(--color-primary);
  font-weight: bold;
}

#terminal-input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  flex: 1;
  caret-color: var(--color-primary);
}

/* --- Features Grid --- */
.features-section {
  padding: 80px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 32px;
  backdrop-filter: blur(var(--glass-blur));
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: 0 10px 30px rgba(255, 85, 0, 0.05);
}

.feature-card:nth-child(2):hover {
  border-color: var(--color-amber);
  box-shadow: 0 10px 30px rgba(255, 170, 0, 0.05);
}

.feature-card:nth-child(3):hover {
  border-color: rgba(0, 240, 255, 0.3);
  box-shadow: 0 10px 30px rgba(0, 240, 255, 0.05);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  background: rgba(255, 85, 0, 0.1);
  color: var(--color-primary);
}

.orange-glow {
  background: rgba(255, 85, 0, 0.08);
  color: var(--color-primary);
  box-shadow: 0 0 15px rgba(255, 85, 0, 0.1);
}

.amber-glow {
  background: rgba(255, 170, 0, 0.08);
  color: var(--color-amber);
  box-shadow: 0 0 15px rgba(255, 170, 0, 0.1);
}

.cyan-glow {
  background: rgba(0, 240, 255, 0.08);
  color: var(--color-secondary);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.1);
}

.feature-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- Architecture Section --- */
.architecture-section {
  padding: 80px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.architecture-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.architecture-text h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  margin: 16px 0 24px;
}

.architecture-text > p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 32px;
}

.stack-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.stack-item {
  display: flex;
  gap: 20px;
}

.stack-number {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  background: rgba(255, 85, 0, 0.06);
  border: 1px solid rgba(255, 85, 0, 0.1);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stack-item h4 {
  font-size: 1.1rem;
  margin-bottom: 6px;
}

.stack-item p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.architecture-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.visual-box {
  width: 100%;
  max-width: 450px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 40px;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  backdrop-filter: blur(var(--glass-blur));
}

.visual-layer {
  padding: 18px;
  border-radius: 8px;
  text-align: center;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
}

.layer-agents {
  background: rgba(255, 85, 0, 0.08);
  border: 1px solid rgba(255, 85, 0, 0.2);
  color: var(--color-primary);
  box-shadow: 0 0 15px rgba(255, 85, 0, 0.1);
}

.pulse-ring {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border: 1px solid var(--color-primary);
  border-radius: 8px;
  animation: pulse-ring-anim 3s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
  pointer-events: none;
}

@keyframes pulse-ring-anim {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(1.15, 1.4); opacity: 0; }
}

.layer-userland {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.layer-kernel {
  background: rgba(0, 240, 255, 0.06);
  border: 1px solid rgba(0, 240, 255, 0.18);
  color: var(--color-secondary);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.06);
}

.visual-connector {
  width: 2px;
  height: 20px;
  background: linear-gradient(to bottom, var(--border-color), var(--border-color));
  margin: 0 auto;
}

/* --- CTA Section --- */
.cta-section {
  padding: 80px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.cta-card {
  background: linear-gradient(135deg, rgba(255, 85, 0, 0.1) 0%, rgba(0, 0, 0, 0.4) 100%);
  border: 1px solid rgba(255, 85, 0, 0.2);
  border-radius: 16px;
  padding: 60px 40px;
  text-align: center;
  backdrop-filter: blur(var(--glass-blur));
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.cta-card h2 {
  font-size: clamp(2rem, 5vw, 2.5rem);
}

.cta-card p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  margin-top: 10px;
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-color);
  background: rgba(5, 6, 8, 0.8);
  padding: 40px 24px;
  margin-top: 60px;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
  width: 100%;
  text-align: center;
  margin-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.03);
  padding-top: 20px;
}

/* --- Responsive styles --- */
@media (max-width: 900px) {
  .architecture-container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .navbar {
    height: 60px;
  }
  
  .nav-links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-color);
    flex-direction: column;
    padding: 40px 24px;
    gap: 24px;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
  }
  
  .nav-links.active {
    transform: translateX(0);
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .mobile-toggle.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .mobile-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .mobile-toggle.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  .hero-actions, .cta-buttons {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
}