/* ============================================================
   FinanceAI — "Quantum Ledger" Design System (Aetheris Prime)
   Based on Stitch MCP generated design tokens
   ============================================================ */

/* --- Design Tokens --- */
:root {
  --bg: #0c0c1d;
  --surface: #121222;
  --surface-low: #1a1a2b;
  --surface-mid: #1e1e2f;
  --surface-high: #29283a;
  --surface-highest: #333345;
  --surface-bright: #38374a;

  --primary: #c4c0ff;
  --primary-container: #8781ff;
  --violet: #6C63FF;
  --cyan: #00D4FF;
  --coral: #ffb785;

  --on-surface: #e3e0f8;
  --on-surface-variant: #c7c4d8;
  --outline: #918fa1;
  --outline-variant: #464555;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Manrope', sans-serif;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--on-surface);
  overflow-x: hidden;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* --- Liquid Canvas --- */
#liquid-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* --- Navigation --- */
#main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 1rem 2rem;
  background: rgba(56, 55, 74, 0.15);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 0.5px solid rgba(196, 192, 255, 0.1);
  transition: background 0.3s, padding 0.3s;
}
#main-nav.scrolled {
  background: rgba(12, 12, 29, 0.85);
  padding: 0.6rem 2rem;
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 0.5rem; }
.logo-icon {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 1.1rem;
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--on-surface);
}
.logo-accent { color: var(--primary); }
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
  transition: width 0.3s;
}
.nav-links a:hover { color: var(--primary); }
.nav-links a:hover::after { width: 100%; }
.btn-nav {
  padding: 0.5rem 1.3rem;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.85rem;
  color: #fff;
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-nav:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(108, 99, 255, 0.35);
}

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  transition: transform 0.25s, box-shadow 0.25s;
  cursor: pointer;
  border: none;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(108, 99, 255, 0.4);
}
.btn-glass {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 2rem;
  background: rgba(70, 69, 85, 0.2);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(70, 69, 85, 0.4);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  color: var(--on-surface);
  transition: all 0.25s;
  cursor: pointer;
}
.btn-glass:hover {
  background: rgba(70, 69, 85, 0.4);
  border-color: rgba(196, 192, 255, 0.3);
  transform: translateY(-2px);
}
.btn-text {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: color 0.2s;
}
.btn-text:hover { color: var(--cyan); }
.btn-full { width: 100%; justify-content: center; }
.btn-lg { padding: 1.1rem 2.5rem; font-size: 1.1rem; }

/* --- Gradient Text --- */
.gradient-text {
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Section Shared --- */
section {
  position: relative;
  z-index: 1;
  padding: 8rem 2rem;
  max-width: 1280px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 4rem;
}
.section-tag {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--surface-highest);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1.2rem;
}
.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
.section-header p {
  color: var(--on-surface-variant);
  font-size: 1.1rem;
}

/* --- Hero Section --- */
#hero {
  min-height: 100vh;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding-top: 7rem;
  gap: 3rem;
}
.hero-content {
  flex: 1 1 520px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 1rem;
  background: var(--surface-highest);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 2rem;
}
.hero-badge .material-icons-round { font-size: 1rem; color: var(--cyan); }
#hero h1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--on-surface-variant);
  max-width: 520px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}
.hero-ctas { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero-visual {
  flex: 1 1 400px;
  min-height: 400px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-glow {
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(108,99,255,0.35), rgba(0,212,255,0.15), transparent 70%);
  border-radius: 50%;
  filter: blur(60px);
  animation: pulseGlow 4s ease-in-out infinite;
}
@keyframes pulseGlow {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.15); opacity: 1; }
}
.hero-stats {
  width: 100%;
  display: flex;
  gap: 1.5rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.stat-card {
  flex: 1 1 160px;
  padding: 1.5rem 2rem;
  background: rgba(30, 30, 47, 0.6);
  backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
  text-align: center;
}
.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--on-surface-variant);
  margin-top: 0.3rem;
  display: block;
}

/* --- Course Cards --- */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.5rem;
}
.course-card {
  padding: 2rem;
  background: rgba(30, 30, 47, 0.5);
  backdrop-filter: blur(16px);
  border-radius: var(--radius-xl);
  transition: transform 0.3s, background 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}
.course-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-xl);
  padding: 1px;
  background: linear-gradient(135deg, rgba(108,99,255,0), rgba(108,99,255,0));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  transition: background 0.4s;
  pointer-events: none;
}
.course-card:hover::before {
  background: linear-gradient(135deg, rgba(108,99,255,0.5), rgba(0,212,255,0.3));
}
.course-card:hover {
  transform: translateY(-4px);
  background: rgba(41, 40, 58, 0.7);
  box-shadow: 0 20px 40px rgba(108, 99, 255, 0.1);
}
.course-icon {
  width: 48px; height: 48px;
  display: grid; place-items: center;
  background: rgba(135, 129, 255, 0.15);
  border-radius: var(--radius-md);
  color: var(--primary-container);
  margin-bottom: 1rem;
}
.course-level {
  display: inline-block;
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.8rem;
}
.beginner { background: rgba(0, 212, 255, 0.15); color: var(--cyan); }
.intermediate { background: rgba(196, 192, 255, 0.15); color: var(--primary); }
.advanced { background: rgba(255, 183, 133, 0.15); color: var(--coral); }
.course-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.course-card p {
  color: var(--on-surface-variant);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}
.course-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.course-price {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--primary);
}

/* --- AI Features --- */
.features-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4rem;
}
.feature-card {
  padding: 2.5rem 2rem;
  background: rgba(30, 30, 47, 0.5);
  backdrop-filter: blur(16px);
  border-radius: var(--radius-xl);
  transition: transform 0.3s, background 0.3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  background: rgba(41, 40, 58, 0.7);
}
.feature-icon {
  width: 52px; height: 52px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(0,212,255,0.1));
  border-radius: var(--radius-md);
  color: var(--primary);
  margin-bottom: 1.2rem;
  font-size: 1.5rem;
}
.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}
.feature-card p {
  color: var(--on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* --- AI Chat Showcase --- */
.ai-showcase {
  max-width: 800px;
  margin: 0 auto;
}
.chat-window {
  background: rgba(26, 26, 43, 0.8);
  backdrop-filter: blur(20px);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(108, 99, 255, 0.08);
}
.chat-header {
  padding: 1rem 1.5rem;
  background: var(--surface-mid);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  font-size: 0.95rem;
}
.chat-header .material-icons-round { color: var(--primary); }
.chat-status {
  margin-left: auto;
  color: #4ade80;
  font-size: 0.8rem;
  font-weight: 500;
}
.chat-body { padding: 1.5rem; }
.chat-msg { display: flex; margin-bottom: 1rem; }
.chat-msg.user { justify-content: flex-end; }
.chat-msg.user .msg-bubble {
  background: linear-gradient(135deg, var(--violet), rgba(108,99,255,0.7));
  color: #fff;
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-sm) var(--radius-lg);
  max-width: 70%;
  padding: 1rem 1.2rem;
  font-size: 0.95rem;
}
.chat-msg.ai .msg-bubble {
  background: var(--surface-high);
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) var(--radius-sm);
  max-width: 85%;
  padding: 1.2rem 1.5rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--on-surface);
}
.msg-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.8rem;
  padding: 0.3rem 0.8rem;
  background: rgba(108,99,255,0.15);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
}
.msg-badge .material-icons-round { font-size: 0.9rem; }

/* --- Pricing --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  align-items: start;
}
.pricing-card {
  padding: 2.5rem 2rem;
  background: rgba(30, 30, 47, 0.5);
  backdrop-filter: blur(16px);
  border-radius: var(--radius-xl);
  position: relative;
  transition: transform 0.3s;
}
.pricing-card:hover { transform: translateY(-4px); }
.pricing-card.featured {
  background: rgba(41, 40, 58, 0.7);
  box-shadow: 0 0 0 1px rgba(108,99,255,0.4), 0 20px 40px rgba(108,99,255,0.12);
}
.featured-badge {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  padding: 0.3rem 1rem;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
}
.pricing-card h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.price {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 2rem;
  background: linear-gradient(135deg, var(--primary), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.price span {
  font-size: 1rem;
  -webkit-text-fill-color: var(--on-surface-variant);
  font-weight: 500;
}
.pricing-card ul { margin-bottom: 2rem; }
.pricing-card li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0;
  color: var(--on-surface-variant);
  font-size: 0.95rem;
}
.pricing-card li .material-icons-round {
  font-size: 1.1rem;
  color: var(--primary-container);
}

/* --- Testimonials --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}
.testimonial-card {
  padding: 2rem;
  background: rgba(30, 30, 47, 0.5);
  backdrop-filter: blur(16px);
  border-radius: var(--radius-xl);
  transition: transform 0.3s;
}
.testimonial-card:hover { transform: translateY(-4px); }
.testimonial-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}
.avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: #fff;
  flex-shrink: 0;
}
.testimonial-header strong { font-size: 1rem; }
.testimonial-header span {
  font-size: 0.82rem;
  color: var(--on-surface-variant);
}
.testimonial-card p {
  color: var(--on-surface-variant);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  font-style: italic;
}
.stars { color: var(--coral); font-size: 0.9rem; letter-spacing: 2px; }

/* --- CTA Section --- */
#cta {
  text-align: center;
  padding: 6rem 2rem 8rem;
}
.cta-content {
  max-width: 640px;
  margin: 0 auto;
}
#cta h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}
#cta p {
  color: var(--on-surface-variant);
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
}

/* --- Footer --- */
footer {
  position: relative;
  z-index: 1;
  background: var(--surface);
  padding: 4rem 2rem 0;
}
.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
  padding-bottom: 3rem;
}
.footer-brand { max-width: 300px; }
.footer-brand p {
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  margin-top: 1rem;
  line-height: 1.6;
}
.footer-links {
  display: flex;
  gap: 4rem;
  flex-wrap: wrap;
}
.footer-links h4 {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--on-surface);
}
.footer-links a {
  display: block;
  color: var(--on-surface-variant);
  font-size: 0.9rem;
  padding: 0.3rem 0;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--primary); }
.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(70, 69, 85, 0.3);
  text-align: center;
  font-size: 0.82rem;
  color: var(--outline);
}

/* --- Scroll Reveal Animations --- */
.reveal, .reveal-up, .reveal-right {
  opacity: 0;
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal { transform: translateY(40px); }
.reveal-up { transform: translateY(60px); }
.reveal-right { transform: translateX(60px); }
.reveal.visible, .reveal-up.visible, .reveal-right.visible {
  opacity: 1;
  transform: translate(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  #hero { padding-top: 6rem; }
  #hero h1 { font-size: 2.5rem; }
  .hero-visual { min-height: 200px; }
  .courses-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .features-row { grid-template-columns: 1fr; }
  .footer-links { gap: 2rem; }
  section { padding: 5rem 1.2rem; }
}