:root {
  --bg: #0A0D19;
  --surface: #121426;
  --card: #191C36;
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.14);
  --accent: #4A73D5;
  --accent-soft: rgba(74, 115, 213, 0.1);
  --accent-glow: rgba(74, 115, 213, 0.25);
  --purple: #7D59D2;
  --purple-soft: rgba(125, 89, 210, 0.1);
  --pink: #CC4D99;
  --pink-soft: rgba(204, 77, 153, 0.1);
  --text: rgba(255, 255, 255, 0.92);
  --text-secondary: rgba(255, 255, 255, 0.58);
  --text-tertiary: rgba(255, 255, 255, 0.35);
  --rag-red: #E64D59;
  --rag-amber: #F2B34D;
  --rag-green: #4DCC80;
  --rag-boost-start: #4A73D5;
  --rag-boost-end: #7D59D2;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", system-ui, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
}

/* ---- Reset ---- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img,
svg {
  display: block;
  max-width: 100%;
}

/* ---- Layout ---- */

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Accessibility ---- */

.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--accent);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 200;
  font-size: 0.875rem;
}

.skip-link:focus {
  top: 16px;
}

/* ---- Navigation ---- */

body > nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 13, 25, 0.8);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

body > nav.scrolled {
  border-bottom-color: var(--border);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
  font-size: 1.125rem;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo:hover {
  text-decoration: none;
}

.logo-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  padding: 14px 28px;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  background: #5A83E5;
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  padding: 10px 20px;
  border: 1px solid rgba(74, 115, 213, 0.3);
}

.btn-ghost:hover {
  background: var(--accent-soft);
  border-color: rgba(74, 115, 213, 0.5);
}

.btn-sm {
  font-size: 0.875rem;
  padding: 8px 16px;
}

.btn-lg {
  font-size: 1rem;
  padding: 16px 32px;
}

/* ---- Hero ---- */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 64px;
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 0;
}

.hero h1 {
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.035em;
  margin-bottom: 24px;
  animation: fade-up 0.8s ease-out;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--purple), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto 40px;
  line-height: 1.65;
  animation: fade-up 0.8s ease-out 0.1s both;
}

.hero-cta {
  animation: fade-up 0.8s ease-out 0.2s both;
}

.hero-note {
  margin-top: 16px;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---- App Showcase ---- */

.showcase {
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}

.showcase-header {
  text-align: center;
  margin-bottom: 64px;
}

.showcase-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.showcase-header p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

.app-mockup {
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.session-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 24px;
}

.session-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.session-title {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.session-meta {
  display: flex;
  gap: 24px;
  margin-bottom: 20px;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.meta-label {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}

.meta-value {
  font-size: 1.125rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  font-family: "SF Mono", ui-monospace, monospace;
  letter-spacing: -0.02em;
}

.session-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.rag-prompt {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: 20px;
  margin-bottom: 10px;
}

.rag-row {
  display: flex;
  gap: 10px;
}

.rag-btn {
  flex: 1;
  padding: 12px 0;
  border-radius: var(--radius-sm);
  border: none;
  font-family: var(--font);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: default;
  transition: all 0.2s ease;
  text-align: center;
}

.rag-red {
  background: rgba(230, 77, 89, 0.12);
  color: var(--rag-red);
  border: 1px solid rgba(230, 77, 89, 0.2);
}

.rag-amber {
  background: rgba(242, 179, 77, 0.12);
  color: var(--rag-amber);
  border: 1px solid rgba(242, 179, 77, 0.2);
}

.rag-green {
  background: rgba(77, 204, 128, 0.15);
  color: var(--rag-green);
  border: 1px solid rgba(77, 204, 128, 0.25);
  box-shadow: 0 0 12px rgba(77, 204, 128, 0.15);
}

.rag-boost {
  background: linear-gradient(135deg, rgba(74, 115, 213, 0.12), rgba(125, 89, 210, 0.12));
  color: var(--purple);
  border: 1px solid rgba(125, 89, 210, 0.2);
}

.volume-chart {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.volume-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.volume-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 80px;
}

.volume-bar {
  flex: 1;
  border-radius: 3px 3px 0 0;
  min-height: 8px;
  transition: height 0.6s ease;
}

.volume-bar.past {
  background: var(--accent);
  opacity: 0.7;
}

.volume-bar.current {
  background: linear-gradient(to top, var(--accent), var(--purple));
}

.volume-bar.future {
  background: var(--border);
}

.volume-bar.deload {
  background: var(--purple);
  opacity: 0.4;
}

/* ---- Scroll reveal ---- */

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-stagger > .reveal {
  transition-delay: calc(var(--i, 0) * 100ms);
}

/* ---- Features ---- */

.features {
  padding: 120px 0;
  border-top: 1px solid var(--border);
}

.features-header {
  text-align: center;
  margin-bottom: 64px;
}

.features-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.features-header p {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.6;
}

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

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

.feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-icon.blue {
  background: var(--accent-soft);
  color: var(--accent);
}

.feature-icon.purple {
  background: var(--purple-soft);
  color: var(--purple);
}

.feature-icon.pink {
  background: var(--pink-soft);
  color: var(--pink);
}

.feature-icon.green {
  background: rgba(77, 204, 128, 0.1);
  color: var(--rag-green);
}

.feature-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 24px;
}

/* ---- Final CTA ---- */

.final-cta {
  padding: 100px 0;
  text-align: center;
}

.final-cta h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 32px;
}

/* ---- Footer ---- */

footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

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

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.footer-brand svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

.footer-copy {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* ---- Prose (Privacy page) ---- */

.prose {
  padding: 120px 0 80px;
}

.prose .container {
  max-width: 720px;
}

.prose h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.prose .last-updated {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-bottom: 48px;
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-top: 48px;
  margin-bottom: 16px;
}

.prose p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* ---- Responsive ---- */

@media (max-width: 840px) {
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .features {
    padding: 80px 0;
  }

  .showcase {
    padding: 80px 0;
  }

  .session-meta {
    gap: 16px;
  }

  .prose {
    padding: 100px 0 60px;
  }
}

@media (max-width: 640px) {
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .rag-row {
    gap: 6px;
  }

  .rag-btn {
    font-size: 0.75rem;
    padding: 10px 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 20px;
  }

  .nav-inner {
    height: 56px;
  }

  .hero {
    padding-top: 56px;
  }

  .btn-primary {
    padding: 12px 24px;
  }

  .btn-lg {
    padding: 14px 28px;
    font-size: 0.9375rem;
  }

  .prose h1 {
    font-size: 2rem;
  }

  .session-meta {
    flex-wrap: wrap;
    gap: 12px;
  }
}