/* Cyber Terminal Color System Mapping */
:root {
  --bg-base: #030712;
  --bg-surface: #0f172a;
  --bg-terminal: #020617;
  --border-color: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent: #06b6d4; /* Cyber Cyan */
  --accent-hover: #0891b2; /* Deep Node Blue */
  --accent-purple: #a855f7;
  --accent-green: #22c55e;
  --radius-main: 16px;
  --shadow-main: 0 10px 15px -3px rgb(0 0 0 / 0.5);
}

/* Base Resets & Layout Core */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 3rem 1.5rem;
  position: relative;
  overflow-x: hidden;
}

/* Static Cyber Grid Background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(6, 182, 212, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(6, 182, 212, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  z-index: -1;
  opacity: 1;
  pointer-events: none;
}

/* Main Dashboard Outer Framework Container */
.gateway-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-main);
  padding: 2.5rem 2rem;
  max-width: 900px;
  width: 100%;
  box-shadow: var(--shadow-main);
  text-align: center;
}

/* Telemetry Branding Headers */
.node-tag {
  font-family: monospace;
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  border: 1px solid rgba(6, 182, 212, 0.2);
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  background-color: rgba(6, 182, 212, 0.05);
  display: inline-block;
  margin-bottom: 1.5rem;
}

.site-title {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.tagline {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* System Category Section Separation Layout Rules */
.section-divider {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-top: 1.5rem;
  margin-bottom: 1.25rem;
  gap: 0.35rem;
}

.section-divider h2 {
  font-family: monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 1px;
}

.section-line {
  height: 1px;
  width: 100%;
  background-color: var(--border-color);
}

/* 2-Column Responsive Dashboard Matrix Grid */
.stack-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

/* Dense Dashboard Card Shell */
.stack-item {
  background-color: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* Card Top Metadata Formatting Row */
.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.status-tag {
  font-family: monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 700;
}

.tag-cyan { color: var(--accent); border: 1px solid rgba(6, 182, 212, 0.2); background-color: rgba(6, 182, 212, 0.05); }
.tag-purple { color: var(--accent-purple); border: 1px solid rgba(168, 85, 247, 0.2); background-color: rgba(168, 85, 247, 0.05); }

.version-chip {
  font-family: monospace;
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.stack-item h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.stack-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

/* Streamlined Interactive Link Box */
.resource-link-box {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: monospace;
  font-size: 0.8rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--accent);
  background-color: var(--bg-terminal);
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 0.8rem 1rem;
  border-radius: 6px;
  text-align: center;
  letter-spacing: 1px;
  transition: all 0.25s ease-in-out;
  margin-top: auto;
}

.resource-link-box:hover {
  background-color: rgba(6, 182, 212, 0.1);
  border-color: var(--accent);
  color: var(--text-primary);
  box-shadow: 0 0 12px rgba(6, 182, 212, 0.2);
}

/* Central Primary Interface Back Link Button */
.btn-enter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.9rem 2rem;
  border-radius: 8px;
  width: 100%;
}

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

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

/* Footer Metrics Telemetry Alignment */
.footer-telemetry {
  font-family: monospace;
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-top: 2rem;
  letter-spacing: 1px;
  text-align: center;
  opacity: 0.6;
}

/* Responsive Mobile Scaling Parameters Override */
@media (max-width: 768px) {
  .stack-matrix { grid-template-columns: 1fr; }
  .gateway-card { padding: 2rem 1.25rem; }
}