.landing-page {
  min-height: 100vh;
  background: var(--bg-primary);
}

.landing-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.landing-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.1rem;
}

.landing-logo img {
  width: 28px;
  height: 28px;
}

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

.landing-nav-links a:not(.btn) {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}

.landing-nav-links a:not(.btn):hover {
  color: var(--text-primary);
}

.landing-hero {
  padding: 80px 32px 40px;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.landing-hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.landing-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-subtle);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

.landing-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin: 0;
}

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

.landing-subtitle {
  font-size: 1.2rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0;
}

.landing-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 8px;
}

.btn-lg {
  padding: 10px 20px;
  font-size: 0.95rem;
}

.landing-browsers {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin: 0;
}

.landing-browsers a {
  color: var(--text-secondary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.landing-browsers a:hover {
  color: var(--text-primary);
}

.landing-demo {
  padding: 40px 32px 80px;
  max-width: 1100px;
  margin: 0 auto;
}

.demo-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

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

.demo-browser-dots {
  display: flex;
  gap: 6px;
}

.demo-browser-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--border);
}

.demo-browser-url {
  flex: 1;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.demo-content {
  display: grid;
  grid-template-columns: 1fr 340px;
  min-height: 380px;
}

.demo-article {
  padding: 32px;
  border-right: 1px solid var(--border);
}

.demo-text {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-primary);
  margin: 0 0 20px 0;
}

.demo-text:last-child {
  margin-bottom: 0;
}

.demo-highlight {
  background-color: transparent;
  color: inherit;
  border-bottom: 2px solid var(--accent);
}

.demo-sidebar {
  padding: 0;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  font-family:
    "IBM Plex Sans",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
}

.demo-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-primary);
}

.demo-logo-section {
  display: flex;
  align-items: center;
  gap: 10px;
}

.demo-logo-icon {
  color: var(--accent);
  display: flex;
  align-items: center;
}

.demo-logo-text {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.demo-user-section {
  display: flex;
  align-items: center;
  gap: 8px;
}

.demo-user-handle {
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  padding: 4px 10px;
  border-radius: 9999px;
}

.demo-user-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-hover);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

.demo-page-info {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-tertiary);
}

.demo-annotations-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
}

.demo-annotation {
  background: var(--bg-primary);
  border: none;
  border-radius: 0;
  padding: 14px 16px;
}

.demo-annotation-secondary {
  opacity: 1;
}

.demo-annotation-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.demo-avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 600;
}

.demo-meta {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.demo-author {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

.demo-time {
  font-size: 11px;
  color: var(--text-tertiary);
}

.demo-quote {
  font-size: 12px;
  font-style: italic;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-left: 2px solid var(--accent);
  margin: 0 0 8px 0;
  background: var(--accent-subtle);
  border-radius: 0 6px 6px 0;
  line-height: 1.5;
}

.demo-comment {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-primary);
  margin: 0 0 12px 0;
}

.demo-jump-btn {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--accent);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  margin-top: 4px;
}

.demo-jump-btn:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.landing-section {
  padding: 80px 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.landing-section-alt {
  background: var(--bg-secondary);
  max-width: none;
}

.landing-section-alt > * {
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

.landing-section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin: 0 0 48px 0;
  color: var(--text-primary);
}

.landing-steps {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.landing-step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.landing-step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.landing-step-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 8px 0;
  color: var(--text-primary);
}

.landing-step-content p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

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

.landing-feature {
  text-align: center;
  padding: 24px 16px;
}

.landing-feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  background: var(--accent-subtle);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.landing-feature h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 8px 0;
  color: var(--text-primary);
}

.landing-feature p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

.landing-protocol {
  background: var(--bg-secondary);
  max-width: none;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.landing-protocol-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
}

.landing-protocol-main h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 16px 0;
  color: var(--text-primary);
}

.landing-protocol-main p {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0 0 16px 0;
  line-height: 1.7;
}

.landing-protocol-main a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.landing-protocol-features {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.landing-protocol-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  color: var(--accent);
}

.landing-protocol-item div {
  display: flex;
  flex-direction: column;
}

.landing-protocol-item strong {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.landing-protocol-item span {
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

.landing-final-cta {
  text-align: center;
}

.landing-final-cta h2 {
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 12px 0;
  color: var(--text-primary);
}

.landing-final-cta p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin: 0 0 28px 0;
}

.landing-footer {
  border-top: 1px solid var(--border);
  padding: 48px 32px 32px;
}

.landing-footer-grid {
  display: flex;
  justify-content: space-between;
  max-width: 1000px;
  margin: 0 auto 40px;
}

.landing-footer-brand {
  max-width: 280px;
}

.landing-footer-brand p {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  margin: 12px 0 0 0;
}

.landing-footer-links {
  display: flex;
  gap: 64px;
}

.landing-footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.landing-footer-col h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin: 0 0 4px 0;
}

.landing-footer-col a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-decoration: none;
}

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

.landing-footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  max-width: 1000px;
  margin: 0 auto;
}

.landing-footer-bottom p {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin: 0;
}

@media (max-width: 900px) {
  .demo-content {
    grid-template-columns: 1fr;
  }

  .demo-article {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .demo-sidebar {
    max-height: 340px;
  }

  .landing-protocol-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .landing-nav {
    padding: 16px 20px;
  }

  .landing-nav-links a:not(.btn) {
    display: none;
  }

  .landing-hero {
    padding: 60px 20px 30px;
  }

  .landing-title {
    font-size: 2.5rem;
  }

  .landing-subtitle {
    font-size: 1.1rem;
  }

  .landing-cta {
    flex-direction: column;
    width: 100%;
  }

  .landing-cta .btn {
    width: 100%;
    justify-content: center;
  }

  .landing-demo {
    padding: 30px 16px 60px;
  }

  .demo-browser-bar {
    padding: 10px 12px;
  }

  .demo-browser-dots {
    display: none;
  }

  .demo-article {
    padding: 20px;
  }

  .demo-text {
    font-size: 0.95rem;
  }

  .demo-sidebar {
    padding: 16px;
  }

  .landing-section {
    padding: 60px 20px;
  }

  .landing-section-title {
    font-size: 1.5rem;
    margin-bottom: 32px;
  }

  .landing-step {
    gap: 16px;
  }

  .landing-step-num {
    width: 32px;
    height: 32px;
    font-size: 0.95rem;
  }

  .landing-features-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .landing-feature {
    text-align: left;
    display: flex;
    gap: 16px;
    padding: 16px 0;
  }

  .landing-feature-icon {
    margin: 0;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
  }

  .landing-protocol-main h2 {
    font-size: 1.5rem;
  }

  .landing-footer {
    padding: 40px 20px 24px;
  }

  .landing-footer-grid {
    flex-direction: column;
    gap: 40px;
  }

  .landing-footer-links {
    flex-wrap: wrap;
    gap: 32px;
  }
}

.demo-hover-indicator {
  position: absolute;
  display: flex;
  align-items: center;
  z-index: 100;
  pointer-events: none;
  background: transparent;
  opacity: 0;
  transform: scale(0.8);
  transition:
    opacity 0.15s ease-out,
    transform 0.15s ease-out;
}

.demo-hover-indicator.visible {
  opacity: 1;
  transform: scale(1);
}

.demo-hover-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--bg-primary);
  margin-left: -10px;
  background: var(--bg-elevated);
}

.demo-hover-avatar:first-child {
  margin-left: 0;
}

.demo-hover-avatar-fallback {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #6366f1;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  font-family: -apple-system, sans-serif;
  border: 2px solid var(--bg-primary);
  margin-left: -10px;
}

.demo-hover-avatar-fallback:first-child {
  margin-left: 0;
}

@keyframes demo-popover-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.demo-popover {
  position: absolute;
  width: 300px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  z-index: 200;
  font-family: inherit;
  color: var(--text-primary);
  opacity: 0;
  animation: demo-popover-in 0.15s forwards;
  max-height: 400px;
  overflow: hidden;
}

.demo-popover-header {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-primary);
  border-radius: 12px 12px 0 0;
  font-weight: 500;
  font-size: 11px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.demo-popover-close {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 2px;
  font-size: 16px;
  line-height: 1;
  opacity: 0.6;
  transition: opacity 0.15s;
}

.demo-popover-close:hover {
  opacity: 1;
}

.demo-popover-scroll-area {
  overflow-y: auto;
  max-height: 340px;
}

.demo-comment-item {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.demo-comment-item:last-child {
  border-bottom: none;
}

.demo-comment-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.demo-comment-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--accent);
}

.demo-comment-handle {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

.demo-comment-text {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.demo-comment-actions {
  display: flex;
  gap: 8px;
}

.demo-comment-action-btn {
  background: none;
  border: none;
  padding: 4px 8px;
  color: var(--text-tertiary);
  font-size: 11px;
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.15s;
}

.demo-comment-action-btn:hover {
  background: var(--bg-hover);
  color: var(--text-secondary);
}