:root {
  --bg-canvas: #0a0c10;
  --bg-surface: #12161f;
  --bg-card: #181d27;
  --bg-card-hover: #1f2633;
  --border-subtle: #262c3a;
  --border-focus: #3b82f6;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, Consolas, monospace;
  --max-width: 1140px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: 72px;
}

/* Typography & General */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  letter-spacing: -0.015em;
  margin-bottom: 1rem;
}

p {
  color: var(--text-secondary);
  font-size: 1rem;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

ul {
  list-style: none;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--accent-blue);
  color: #ffffff;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.35);
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  white-space: nowrap;
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: var(--text-muted);
  transform: translateY(-1px);
}

.btn-large {
  padding: 14px 28px;
  font-size: 1.05rem;
  width: 100%;
}

/* Badges & Tags */
.badge {
  display: inline-block;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.3);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 9999px;
  letter-spacing: 0.02em;
  font-family: var(--font-mono);
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
}

/* Header & Navigation Bar */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(18, 22, 31, 0.85);
  border-bottom: 1px solid var(--border-subtle);
}

nav[role="navigation"] {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.nav-cta {
  flex-shrink: 0;
}

/* Main Container & Sections */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-subtle);
}

section:last-of-type {
  border-bottom: none;
}

/* Hero Section */
#hero {
  padding: 100px 0 60px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-eyebrow {
  display: inline-block;
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.25);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.hero-headline {
  font-size: clamp(2.5rem, 5vw, 3.8rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: #ffffff;
  margin-bottom: 1.5rem;
  max-width: 960px;
}

.hero-subheadline {
  max-width: 780px;
  color: var(--text-secondary);
  font-size: 1.2rem;
  line-height: 1.65;
  margin-bottom: 2.5rem;
}

.metric-badges-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  width: 100%;
  max-width: 980px;
  margin-bottom: 2.5rem;
}

.metric-badge {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.metric-badge:hover {
  border-color: var(--border-focus);
  transform: translateY(-2px);
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.metric-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* The Problem Section */
#stack-problem {
  text-align: left;
  max-width: 860px;
  margin: 0 auto;
}

#stack-problem p {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* Flagship Wedge: Knowledge Firewall */
#firewall {
  text-align: left;
}

#firewall .section-lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin-bottom: 2.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-bottom: 2.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

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

.feature-card h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.architecture-callout {
  background: var(--bg-surface);
  border: 1px solid rgba(16, 185, 129, 0.4);
  border-radius: 8px;
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

.architecture-callout h3 {
  color: var(--accent-emerald);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.architecture-callout h3::before {
  content: "●";
  font-size: 0.8rem;
  color: var(--accent-emerald);
}

.architecture-callout p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 4-Phase Architecture Section */
#phases {
  text-align: left;
}

.tab-navigation {
  display: flex;
  gap: 8px;
  background: var(--bg-surface);
  padding: 6px;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
  margin: 2rem 0;
  overflow-x: auto;
}

.tab-btn {
  flex: 1;
  min-width: 120px;
  padding: 10px 16px;
  background: transparent;
  color: var(--text-secondary);
  border: none;
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--accent-blue);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(59, 130, 246, 0.3);
}

.tab-panels {
  min-height: 260px;
}

.tab-panel {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 32px;
  animation: fadeIn 0.25s ease;
}

.tab-panel.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-panel h3 {
  font-size: 1.35rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.phase-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.tab-panel ul {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.tab-panel li {
  position: relative;
  padding-left: 28px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.tab-panel li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-emerald);
  font-weight: 700;
}

/* Competitor Comparison Section */
#comparison {
  text-align: left;
}

.table-container {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  margin-top: 2rem;
  background: var(--bg-surface);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

th, td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}

thead th {
  background: var(--bg-surface);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--border-subtle);
}

tbody tr:nth-child(even) {
  background: var(--bg-card);
}

tbody tr:nth-child(odd) {
  background: var(--bg-surface);
}

tbody tr:last-child td {
  border-bottom: none;
}

/* Ace Plotline column emphasis */
th:nth-child(2), td:nth-child(2) {
  background: rgba(59, 130, 246, 0.08);
  border-left: 1px solid rgba(59, 130, 246, 0.25);
  border-right: 1px solid rgba(59, 130, 246, 0.25);
}

thead th:nth-child(2) {
  color: var(--accent-blue);
  font-weight: 700;
}

td:nth-child(2) strong {
  color: var(--text-primary);
  font-weight: 700;
}

/* Pricing Section */
#pricing {
  text-align: center;
}

.pricing-card {
  max-width: 540px;
  margin: 2.5rem auto 0;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.pricing-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: radial-gradient(circle, var(--accent-blue) 0%, transparent 80%);
}

.price {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.price-type {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
}

.license {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-weight: 500;
}

.pricing-includes {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 2.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
}

.pricing-includes li {
  position: relative;
  padding-left: 28px;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.pricing-includes li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-emerald);
  font-weight: 700;
}

.pricing-subtext {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1rem;
}

/* System Specifications Section */
#specs {
  text-align: left;
}

.specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 2rem;
}

.spec-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 24px;
}

.spec-card h3 {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue);
  margin-bottom: 0.75rem;
}

.spec-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.spec-card code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88rem;
  color: var(--accent-emerald);
}

/* Footer */
footer[role="contentinfo"] {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
}

footer p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

/* Mobile & Tablet Responsiveness */
@media (max-width: 768px) {
  body {
    padding-top: 64px;
  }

  nav[role="navigation"] {
    height: 64px;
    padding: 0 16px;
  }

  .nav-links {
    display: none;
  }

  .hero-headline {
    font-size: 2.2rem;
  }

  .hero-subheadline {
    font-size: 1.05rem;
  }

  .metric-badges-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions a {
    width: 100%;
  }

  .tab-navigation {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tab-btn {
    flex: 0 0 auto;
    font-size: 0.85rem;
    padding: 8px 14px;
  }

  .pricing-card {
    padding: 28px 20px;
  }

  .price {
    font-size: 2.8rem;
  }

  th, td {
    padding: 12px 14px;
  }

  footer[role="contentinfo"] {
    padding: 32px 16px;
  }
}

@media (max-width: 480px) {
  .metric-badges-grid {
    grid-template-columns: 1fr;
  }
}