/* ============================================
   DataPilot AI — Product Landing Page
   ============================================ */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a2234;
  --bg-card-hover: #1f2a40;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-light: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.35);
  --gradient-start: #3b82f6;
  --gradient-end: #8b5cf6;
  --border: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(148, 163, 184, 0.25);
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.25s ease;
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Header ---- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(10, 14, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.header.scrolled {
  background: rgba(10, 14, 23, 0.95);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

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

.logo-icon {
  color: var(--accent-light);
  font-size: 1.25rem;
}

.logo-accent {
  color: var(--accent-light);
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.nav-cta {
  padding: 8px 20px;
  background: var(--accent);
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background var(--transition), transform var(--transition);
}

.nav-cta:hover {
  background: var(--accent-light);
  transform: translateY(-1px);
}

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

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--header-height) + 48px) 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(59, 130, 246, 0.25), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.15), transparent),
    radial-gradient(ellipse 50% 30% at 20% 80%, rgba(59, 130, 246, 0.1), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.hero-tags span {
  padding: 6px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: white;
  box-shadow: 0 4px 20px var(--accent-glow);
}

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

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

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

.hero-modules {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.hero-modules span {
  padding: 8px 16px;
  background: rgba(26, 34, 52, 0.8);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---- Sections ---- */
.section {
  padding: 100px 0;
}

.section-dark {
  background: var(--bg-secondary);
}

.section-alt {
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ---- Value Cards ---- */
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.value-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.value-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.value-num {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.value-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.value-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.positioning-quote {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(139, 92, 246, 0.08));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
}

.positioning-quote blockquote {
  font-size: 1.15rem;
  font-weight: 500;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.quote-sub {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ---- Pillars ---- */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}

.pillar-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  background: var(--bg-card-hover);
}

.pillar-icon {
  font-size: 1.5rem;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.pillar-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.pillar-card ul {
  list-style: none;
}

.pillar-card li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.pillar-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

/* ---- Modules ---- */
.modules-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 48px;
  padding: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.modules-flow span {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.flow-arrow {
  color: var(--accent);
  font-weight: 600;
}

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

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

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

.module-card-highlight {
  border-color: rgba(59, 130, 246, 0.4);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(139, 92, 246, 0.05));
}

.module-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.module-icon {
  font-size: 1.25rem;
  color: var(--accent-light);
}

.module-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

.module-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

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

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

.user-card:hover {
  border-color: var(--border-hover);
}

.user-role {
  display: inline-block;
  padding: 4px 10px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-light);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 4px;
  margin-bottom: 12px;
}

.user-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.user-modules {
  font-size: 0.8rem;
  color: var(--accent-light);
  margin-bottom: 12px;
}

.user-card p:last-child {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ---- Architecture ---- */
.arch-layers {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 40px;
}

.arch-layer {
  display: flex;
  align-items: center;
  gap: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 28px;
  transition: border-color var(--transition);
}

.arch-layer:hover {
  border-color: var(--border-hover);
}

.arch-label {
  flex-shrink: 0;
  width: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-light);
}

.arch-content {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.arch-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(59, 130, 246, 0.12);
  border-radius: 6px;
  font-size: 0.8rem;
  color: var(--text-primary);
  margin-right: 8px;
  margin-bottom: 4px;
}

.arch-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.arch-highlight {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.arch-highlight strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.arch-highlight span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ---- CTA ---- */
.cta-section {
  padding: 80px 0;
}

.cta-box {
  text-align: center;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(139, 92, 246, 0.12));
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-lg);
  padding: 64px 48px;
}

.cta-box h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-box p {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.cta-values {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 24px;
}

.cta-values span {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.cta-version {
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.footer-inner {
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.footer-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

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

/* ---- Animations ---- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-badge,
.hero-title,
.hero-subtitle,
.hero-tags,
.hero-actions,
.hero-modules {
  animation: fadeInUp 0.7s ease backwards;
}

.hero-title { animation-delay: 0.1s; }
.hero-subtitle { animation-delay: 0.2s; }
.hero-tags { animation-delay: 0.3s; }
.hero-actions { animation-delay: 0.4s; }
.hero-modules { animation-delay: 0.5s; }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .value-grid,
  .modules-grid,
  .users-grid,
  .arch-highlights {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav-links,
  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links.open {
    display: flex;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open + .nav-cta {
    display: none;
  }

  .value-grid,
  .modules-grid,
  .users-grid,
  .arch-highlights {
    grid-template-columns: 1fr;
  }

  .arch-layer {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .arch-label {
    width: auto;
  }

  .section {
    padding: 64px 0;
  }

  .cta-box {
    padding: 40px 24px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

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

  .btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }
}