/**
 * KMNS Unified Design System Stylesheet (`kmns.css`)
 * ===================================================
 * Single Source of Truth (SSOT) design tokens and components shared across:
 *   - kmns.io (Astro marketing hub)
 *   - validate.kmns.io (Zola documentation)
 *
 * ARCHITECTURAL NOTES ON MULTI-DOMAIN THEME MIGRATION:
 * ---------------------------------------------------
 * PROS of Centralized Multi-Domain Stylesheet:
 *   1. Visual Parity: Instant, identical branding, dark mode, typography, and contrast across domains.
 *   2. Direct Origin Evidence: Conditional requests can provide private security evidence at Citadel/HAProxy.
 *      They are not unique-visitor analytics and are never joined to marketing identities.
 *   4. Zero Maintenance Duplication: Token updates (colors, borders, fonts) update across all sites at once.
 *
 * CONS / RISKS of Centralized Multi-Domain Stylesheet:
 *   1. CORS / CSP Friction: Subdomains require strict Access-Control-Allow-Origin headers and
 *      proper style-src directives in Content-Security-Policy (addressed via Citadel HAProxy).
 *   2. Cross-Subdomain Cache Partitioning: Modern browsers (Chrome/Safari state partitioning)
 *      isolate HTTP caches by top-level frame site to prevent cross-site tracking. While this applies
 *      across different third-party domains (e.g. foo.com vs bar.com), same-eTLD+1 subdomains
 *      (*.kmns.io) can still leverage shared connection pools and edge compression.
 *   3. Coupled Release Cycles: A breaking CSS class change in a shared file could inadvertently
 *      affect doc rendering unless class names are strictly scoped and semantic.
 */

/* -------------------------------------------------------------
   Self-Hosted Typography (GDPR-Compliant, Zero External CDN Leak)
   Fonts served directly from /assets/fonts/ on *.kmns.io
   ------------------------------------------------------------- */
@font-face {
  font-family: 'Plus Jakarta Sans';
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url('/assets/fonts/PlusJakartaSans-Variable.woff2') format('woff2-variations'),
       url('/assets/fonts/PlusJakartaSans-Variable.woff2') format('woff2');
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url('/assets/fonts/JetBrainsMono-Variable.woff2') format('woff2-variations'),
       url('/assets/fonts/JetBrainsMono-Variable.woff2') format('woff2');
}

:root {
  --bg-base: #06090e;
  --bg-surface: #0c121d;
  --bg-surface-elevated: #131c2e;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(56, 189, 248, 0.25);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #38bdf8;
  --accent-indigo: #818cf8;
  --accent-emerald: #34d399;
  --accent-amber: #fbbf24;
  --accent-rose: #f472b6;
  --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  --shadow-glow: 0 0 50px -10px rgba(56, 189, 248, 0.2);
}

/* -------------------------------------------------------------
   Hero Banner & Showcase Components
   ------------------------------------------------------------- */
.hero-banner {
  padding: 2.5rem 1.5rem;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, #1e293b 0%, #0f172a 100%);
  border-radius: 12px;
  border: 1px solid #334155;
  margin-bottom: 2.5rem;
}

.hero-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid #3b82f6;
  border-radius: 9999px;
  color: #60a5fa;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 1rem;
  color: #f8fafc;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: #94a3b8;
  max-width: 760px;
  margin: 0 auto 1.5rem auto;
  line-height: 1.6;
}

/* -------------------------------------------------------------
   Feature Grid & Cards
   ------------------------------------------------------------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.75rem;
  max-width: 720px;
  margin: 0 auto 1.75rem auto;
  text-align: left;
}

.feature-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid #334155;
  border-radius: 8px;
  padding: 0.75rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

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

.feature-val {
  font-weight: 700;
  font-size: 1.05rem;
  font-family: 'JetBrains Mono', monospace;
}

.feature-desc {
  color: #94a3b8;
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

/* -------------------------------------------------------------
   Action Buttons & Terminal Box
   ------------------------------------------------------------- */
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn-primary-doc {
  background: #3b82f6;
  color: #ffffff !important;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary-doc:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.45);
}

.btn-secondary-doc {
  background: #1e293b;
  color: #cbd5e1 !important;
  border: 1px solid #475569;
  padding: 0.75rem 1.75rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.btn-secondary-doc:hover {
  background: #334155;
  border-color: #64748b;
}

.hero-install-code {
  margin-top: 1.5rem;
}

.hero-install-code code {
  background: #020617;
  color: var(--accent-cyan) !important;
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  border: 1px solid #1e293b;
  font-size: 0.95rem;
  font-family: 'JetBrains Mono', monospace;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* -------------------------------------------------------------
   Shared Clean Layout & Component Utilities
   (Used by kmns.io and validate.kmns.io docs)
   ------------------------------------------------------------- */
body.kmns-body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.kmns-container {
  max-width: 1120px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.kmns-header {
  padding: 24px 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
  gap: 16px;
}

.brand {
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 800;
  text-decoration: none;
}

.page-content {
  flex: 1;
  padding: 48px 0 80px;
}

.content-card {
  max-width: 800px;
  margin: 0 auto;
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  background: var(--bg-surface);
}

.prose {
  color: var(--text-secondary);
  line-height: 1.7;
}

.prose h1,
.prose h2 {
  color: var(--text-primary);
}

.prose a {
  color: var(--accent-cyan);
}

.kmns-logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
  transition: transform 0.2s ease;
}

.kmns-logo-mark:hover {
  transform: scale(1.05);
}

.kmns-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 14px;
}

.kmns-nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.15s ease;
}

.kmns-nav-link:hover, .kmns-nav-link.active {
  color: var(--accent-cyan);
  font-weight: 700;
}

.kmns-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(52, 211, 153, 0.1);
  color: var(--accent-emerald);
  border: 1px solid rgba(52, 211, 153, 0.25);
  font-family: 'JetBrains Mono', monospace;
}

.kmns-badge-subtle {
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
}

.kmns-platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

.kmns-platform-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.kmns-platform-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px -10px rgba(0, 0, 0, 0.5), var(--shadow-glow);
}

.kmns-platform-card.highlight {
  background: linear-gradient(180deg, rgba(19, 28, 46, 0.8) 0%, rgba(12, 18, 29, 0.95) 100%);
  border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 8px 30px -10px rgba(56, 189, 248, 0.2);
}

.kmns-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.kmns-card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin: 14px 0 24px;
  flex: 1;
}

.kmns-card-footer {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.kmns-link-arrow {
  color: var(--accent-cyan);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s ease, color 0.2s ease;
}

.kmns-link-arrow:hover {
  color: #7dd3fc;
  gap: 10px;
}

/* Value Props Comparison Grid */
.kmns-value-section {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 40px;
  margin-top: 60px;
}

.kmns-value-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  margin-top: 28px;
}

.kmns-value-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.kmns-value-item p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.65;
  margin: 0;
}

.kmns-footer {
  margin-top: auto;
  padding: 36px 0 44px;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 13px;
  color: var(--text-muted);
}

.kmns-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.kmns-footer a:hover {
  color: var(--accent-cyan);
}

.kmns-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

@media (max-width: 720px) {
  .kmns-container {
    padding: 0 16px;
  }

  .kmns-header {
    align-items: flex-start;
  }

  .kmns-nav {
    order: 3;
    width: 100%;
    overflow-x: auto;
  }

  .hero-install-code code {
    display: block;
    overflow-x: auto;
  }

  .kmns-platform-grid {
    grid-template-columns: 1fr;
  }
}