:root {
  --bg-dark: #080b11;
  --bg-card: rgba(18, 24, 38, 0.7);
  --bg-card-hover: rgba(26, 34, 52, 0.85);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(120, 119, 198, 0.4);
  
  --primary: #6366f1;
  --primary-glow: #818cf8;
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
  --secondary-gradient: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-subtle: #64748b;
  
  --accent-cyan: #38bdf8;
  --accent-emerald: #10b981;
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-glow: 0 0 50px -10px rgba(99, 102, 241, 0.3);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Ambient glow spheres */
.glow-sphere {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
}

.sphere-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, transparent 70%);
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
}

.sphere-2 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.18) 0%, transparent 70%);
  top: 600px;
  right: -100px;
}

.sphere-3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.15) 0%, transparent 70%);
  top: 1400px;
  left: -100px;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

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

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(8, 11, 17, 0.75);
  border-bottom: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  transition: all 0.3s ease;
}

.nav-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.logo-icon svg {
  width: 20px;
  height: 20px;
}

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

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

.nav-item {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  border: 1px solid transparent;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(168, 85, 247, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border-color: var(--border-glass);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-glass {
  background: rgba(18, 24, 38, 0.8);
  color: var(--text-main);
  border-color: var(--border-glass);
  backdrop-filter: blur(10px);
}

.btn-glass:hover {
  background: rgba(26, 34, 52, 1);
  border-color: var(--border-focus);
}

.btn-arrow {
  width: 16px;
  height: 16px;
  transition: transform 0.2s;
}

.btn-primary:hover .btn-arrow {
  transform: translateX(4px);
}

/* Hero Section */
.hero-section {
  padding: 170px 0 100px;
  text-align: center;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-glass);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.badge-tag {
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.text-gradient {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 40px;
  font-weight: 400;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  margin-bottom: 64px;
}

/* Glass Card */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  transition: all 0.3s ease;
}

/* Demo Box Window */
.demo-wrapper {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
}

.demo-window {
  text-align: left;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.window-header {
  background: rgba(13, 17, 26, 0.95);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-glass);
}

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

.ctrl {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.ctrl-red { background: #ef4444; }
.ctrl-yellow { background: #f59e0b; }
.ctrl-green { background: #10b981; }

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

.window-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 500;
}

.pulse-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.demo-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.demo-query-box {
  display: flex;
  gap: 16px;
  background: rgba(0, 0, 0, 0.3);
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-glass);
}

.query-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--secondary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.query-label {
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--primary-glow);
  font-weight: 700;
  margin-bottom: 4px;
}

.query-text {
  font-size: 0.95rem;
  color: var(--text-main);
}

.demo-timeline {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 8px;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.step-completed .step-icon {
  color: var(--accent-emerald);
  font-weight: bold;
}

.step-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(99, 102, 241, 0.3);
  border-top-color: var(--primary-glow);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.demo-output-preview {
  background: rgba(16, 21, 33, 0.8);
  border-radius: var(--radius-md);
  padding: 18px;
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.output-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-subtle);
  margin-bottom: 8px;
  text-transform: uppercase;
  font-weight: 700;
}

.output-model {
  color: var(--accent-cyan);
}

.output-text {
  font-size: 0.92rem;
  color: #e2e8f0;
  line-height: 1.6;
}

/* Features Grid */
.features-section {
  padding: 120px 0;
}

.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 60px;
}

.section-tag {
  display: inline-block;
  color: var(--accent-cyan);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

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

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.feature-card {
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.16);
  transform: translateY(-4px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-glow);
}

.feature-icon svg {
  width: 26px;
  height: 26px;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
}

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

/* Architecture Section */
.architecture-section {
  padding: 60px 0 120px;
}

.architecture-box {
  padding: 56px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.arch-left h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin: 12px 0 20px;
  line-height: 1.25;
}

.arch-left p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 28px;
}

.arch-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.arch-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: #cbd5e1;
}

.arch-right {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.spec-card {
  background: rgba(13, 17, 26, 0.7);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 20px 24px;
}

.spec-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  color: var(--text-subtle);
  font-weight: 700;
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.spec-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.spec-value span {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* Contact Section */
.contact-section {
  padding: 100px 0;
  background: radial-gradient(circle at center, rgba(99, 102, 241, 0.08) 0%, transparent 70%);
}

.subscribe-form {
  display: flex;
  max-width: 520px;
  margin: 36px auto 24px;
  gap: 12px;
}

.form-input {
  flex: 1;
  background: rgba(18, 24, 38, 0.8);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-full);
  padding: 14px 24px;
  color: #fff;
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-input:focus {
  border-color: var(--primary-glow);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.3);
}

.contact-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.contact-meta strong {
  color: var(--text-main);
}

.separator {
  margin: 0 10px;
  color: var(--text-subtle);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-glass);
  padding: 40px 0;
  background: rgba(5, 7, 11, 0.95);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand p {
  color: var(--text-subtle);
  font-size: 0.85rem;
  margin-top: 6px;
}

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

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s;
}

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

/* Responsive */
@media (max-width: 900px) {
  .nav-links {
    display: none;
  }
  
  .architecture-box {
    grid-template-columns: 1fr;
    padding: 32px;
  }
  
  .subscribe-form {
    flex-direction: column;
  }
}