:root {
  --bg: #0a0a1a;
  --bg-elevated: #12122a;
  --bg-card: #1a1a3a;
  --fg: #e8e8f0;
  --fg-muted: #8888aa;
  --accent: #7c5cfc;
  --accent-glow: rgba(124, 92, 252, 0.3);
  --gradient: linear-gradient(135deg, #7c5cfc, #00d4ff);
  --gradient-text: linear-gradient(135deg, #9b7cff, #00d4ff);
  --border: rgba(124, 92, 252, 0.15);
  --radius: 12px;
  --radius-lg: 20px;
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #9b7cff; }

code {
  font-family: var(--font-mono);
  background: var(--bg-elevated);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
}

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

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--fg);
}

.nav-logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--fg-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-cta {
  background: var(--gradient);
  color: #fff !important;
  padding: 8px 18px;
  border-radius: 8px;
}

.nav-cta:hover { color: #fff !important; opacity: 0.9; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--fg);
  border-radius: 2px;
  transition: all 0.3s;
}

/* Hero */
.hero {
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0.4;
  pointer-events: none;
}

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

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--fg-muted);
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.hero-meta {
  font-size: 0.85rem;
  color: var(--fg-muted);
}

.hero-screenshot {
  position: relative;
}

/* Placeholder screenshots */
.placeholder-screenshot {
  background: var(--bg-elevated);
  border: 2px dashed rgba(124, 92, 252, 0.35);
  border-radius: var(--radius-lg);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.placeholder-screenshot::before {
  content: attr(data-label);
  color: var(--fg-muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 24px;
  line-height: 1.5;
  max-width: 90%;
}

.placeholder-screenshot::after {
  content: '📷 Screenshot needed';
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.placeholder-screenshot.small {
  min-height: 180px;
  border-radius: var(--radius);
  margin-top: 16px;
}

.placeholder-screenshot.small::after {
  font-size: 0.6rem;
  top: 8px;
  right: 8px;
  padding: 3px 8px;
}

/* Section defaults */
section { padding: 100px 0; }

h2 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  text-align: center;
}

.section-sub {
  text-align: center;
  color: var(--fg-muted);
  font-size: 1.1rem;
  max-width: 680px;
  margin: 0 auto 48px;
}

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color 0.3s, transform 0.2s;
}

.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

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

/* How it works */
.how-it-works {
  background: var(--bg-elevated);
}

.steps {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 60px;
}

.step {
  flex: 1;
  text-align: center;
}

.step-number {
  width: 56px;
  height: 56px;
  background: var(--gradient);
  color: #fff;
  font-size: 1.5rem;
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.step p {
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.step-arrow {
  font-size: 2rem;
  color: var(--accent);
  padding-top: 60px;
  flex-shrink: 0;
}

.context-loop {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
}

.context-loop-title {
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--fg);
}

.context-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

.flow-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  white-space: nowrap;
}

.flow-arrow {
  color: var(--accent);
  font-weight: 700;
}

/* Backends */
.backend-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.backend-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.backend-card h3 {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.backend-tagline {
  color: var(--fg-muted);
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.backend-details {
  list-style: none;
  margin-bottom: 0;
}

.backend-details li {
  padding: 6px 0;
  color: var(--fg-muted);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border);
}

.backend-details li:last-child { border-bottom: none; }
.backend-details li strong { color: var(--fg); }

/* Browser */
.browser {
  background: var(--bg-elevated);
}

.browser-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.browser-step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
}

.browser-step-num {
  width: 36px;
  height: 36px;
  background: var(--gradient);
  color: #fff;
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  font-size: 1rem;
}

.browser-step p {
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.browser-step code {
  font-size: 0.8rem;
}

.browser-sites {
  text-align: center;
  margin-top: 40px;
}

.browser-sites-label {
  color: var(--fg-muted);
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.site-pills {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.site-pill {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 18px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* Open source */
.open-source { text-align: center; }

.oss-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 32px 0;
  flex-wrap: wrap;
}

.oss-badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
}

.oss-actions { margin-top: 8px; }

/* Download */
.download {
  background: var(--bg-elevated);
}

.download-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.download-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
}

.download-card.primary {
  border-color: var(--accent);
  box-shadow: 0 4px 30px var(--accent-glow);
}

.download-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
}

.download-card p {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.download-meta {
  font-size: 0.8rem !important;
  margin-top: 16px !important;
  margin-bottom: 0 !important;
}

.code-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
  text-align: left;
}

.code-block code {
  background: none;
  padding: 0;
  font-size: 0.8rem;
  line-height: 1.8;
  color: var(--fg-muted);
  display: block;
}

/* Footer */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}

.footer-logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

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

.footer-links a {
  color: var(--fg-muted);
  font-size: 0.85rem;
}

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

.footer-copy p {
  color: var(--fg-muted);
  font-size: 0.8rem;
}

/* Scroll animations */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero h1 { font-size: 2.5rem; }
  .hero-actions { justify-content: center; }

  .feature-grid {
    grid-template-columns: 1fr 1fr;
  }

  .steps { flex-direction: column; align-items: center; }
  .step-arrow { transform: rotate(90deg); padding: 0; }

  .backend-grid,
  .browser-steps,
  .download-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  h2 { font-size: 1.8rem; }

  .feature-grid { grid-template-columns: 1fr; }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 26, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .hero-actions { flex-direction: column; align-items: stretch; }

  .context-flow { flex-direction: column; }
  .flow-arrow { transform: rotate(90deg); }

  .footer-inner { flex-direction: column; text-align: center; }
}