:root {
  --bg: #0f1419;
  --bg-elevated: #161c23;
  --bg-card: #1a2129;
  --bg-card-hover: #1e2730;
  --text: #e5e7eb;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --accent: #22c55e;
  --accent-dark: #16a34a;
  --accent-glow: rgba(34, 197, 94, 0.15);
  --border: #242d36;
  --border-light: #2d3748;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  --transition: 0.15s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: #000;
  border-radius: 6px;
  font-size: 0.85rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-light);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  padding: 6px 14px;
  font-size: 0.8125rem;
}

.btn-ghost:hover {
  color: var(--text);
  border-color: var(--border-light);
  background: var(--bg-card);
}

/* Hero */
.hero {
  padding-top: 120px;
  padding-bottom: 80px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-title {
  font-size: clamp(2.4rem, 5.5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text);
}

.hero-title .accent {
  color: var(--accent);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 16px;
}

.hero-note {
  font-size: 0.8125rem;
  color: var(--text-dim);
}

/* Demo / Dashboard Preview */
.demo {
  padding: 40px 0 80px;
  display: flex;
  justify-content: center;
}

.demo-frame {
  width: 100%;
  max-width: 860px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(34, 197, 94, 0.06);
}

.demo-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
}

.demo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.demo-dot.red { background: #ef4444; }
.demo-dot.yellow { background: #eab308; }
.demo-dot.green { background: var(--accent); }

.demo-title {
  margin-left: 8px;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-family: 'JetBrains Mono', monospace;
}

.demo-body {
  display: flex;
  min-height: 420px;
}

.demo-sidebar {
  width: 170px;
  padding: 16px 0;
  background: rgba(255,255,255,0.02);
  border-right: 1px solid var(--border);
}

.nav-item {
  padding: 8px 20px;
  font-size: 0.8125rem;
  color: var(--text-dim);
  cursor: default;
}

.nav-item.active {
  color: var(--accent);
  background: rgba(34, 197, 94, 0.08);
  border-right: 2px solid var(--accent);
}

.demo-main {
  flex: 1;
  padding: 24px;
}

.demo-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}

.stat-trend {
  font-size: 0.75rem;
  margin-top: 4px;
}

.stat-trend.good { color: var(--accent); }
.stat-trend.warn { color: #eab308; }

.demo-alert {
  display: flex;
  gap: 12px;
  background: rgba(34, 197, 94, 0.06);
  border: 1px solid rgba(34, 197, 94, 0.15);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
}

.alert-icon {
  font-size: 1.2rem;
  flex-shrink: 0;
}

.alert-text strong {
  display: block;
  font-size: 0.8125rem;
  color: var(--text);
  margin-bottom: 4px;
}

.alert-text p {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.demo-graph {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
}

.graph-placeholder {
  font-size: 0.8125rem;
  color: var(--text-dim);
  font-style: italic;
}

/* Sections */
.features, .how, .pricing, .faq, .cta {
  padding: 80px 0;
}

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  max-width: 500px;
  margin: 0 auto 48px;
  font-size: 1.05rem;
}

/* Features Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.feature {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}

.feature:hover {
  border-color: var(--border-light);
  background: var(--bg-card-hover);
}

.feature-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border: 1px solid rgba(34, 197, 94, 0.15);
  border-radius: 10px;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.feature h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.feature p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* How it works */
.how .section-title {
  margin-bottom: 48px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.step {
  text-align: center;
}

.step-num {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 auto 16px;
}

.step h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.step code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent);
}

/* Pricing */
.pricing {
  background: rgba(255,255,255,0.02);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border-color: rgba(34, 197, 94, 0.3);
  box-shadow: 0 0 40px rgba(34, 197, 94, 0.08);
}

.pricing-badge {
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #000;
  padding: 4px 16px;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
}

.pricing-name {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 3rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
  margin-bottom: 4px;
}

.pricing-price::before {
  content: '$';
  font-size: 1.5rem;
  font-weight: 500;
  margin-right: 2px;
  vertical-align: top;
}

.pricing-period {
  font-size: 0.8125rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.pricing-features {
  list-style: none;
  margin-bottom: 24px;
  flex: 1;
}

.pricing-features li {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pricing-features li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 600;
}

.pricing-card .btn {
  width: 100%;
}

/* FAQ */
.faq-list {
  max-width: 700px;
  margin: 0 auto;
}

details {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

summary {
  padding: 16px 20px;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: '+';
  font-size: 1.2rem;
  color: var(--text-dim);
  transition: transform var(--transition);
}

details[open] summary::after {
  content: '−';
  color: var(--accent);
}

details > p {
  padding: 0 20px 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* CTA */
.cta {
  text-align: center;
  padding: 100px 0;
}

.cta h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

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

.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

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

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
}

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

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.8125rem;
  transition: color var(--transition);
}

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

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links a:not(.btn) {
    display: none;
  }

  .hero-cta {
    flex-direction: column;
  }

  .demo-stats {
    grid-template-columns: 1fr;
  }

  .demo-body {
    flex-direction: column;
  }

  .demo-sidebar {
    width: 100%;
    display: flex;
    gap: 0;
    padding: 8px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .nav-item {
    flex: 1;
    text-align: center;
    padding: 8px;
    border-radius: 4px;
  }

  .nav-item.active {
    border-right: none;
  }

  .cta-buttons {
    flex-direction: column;
  }

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