/**
 * SYNAPSE INFRASTRUCTURE — Enterprise Systems & Mission-Critical Networks
 * CSS Architecture complying with Modern Web Standards & Container Queries
 */

/* ==========================================================================
   1. DESIGN TOKENS & CUSTOM PROPERTIES
   ========================================================================== */
:root {
  /* Palette: Dark-Mode Enterprise Datacenter */
  --bg-base: #06090f;
  --bg-surface-1: #0b111a;
  --bg-surface-2: #101926;
  --bg-surface-3: #162234;
  --bg-glass: rgba(11, 17, 26, 0.78);
  --bg-glass-card: rgba(16, 25, 38, 0.65);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(0, 229, 255, 0.4);
  --border-glow: 0 0 20px rgba(0, 229, 255, 0.15);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-accent: #00e5ff;

  /* Accent Colors */
  --cyan-primary: #00e5ff;
  --cyan-glow: rgba(0, 229, 255, 0.35);
  --emerald-status: #10b981;
  --amber-warning: #f59e0b;
  --rose-alert: #f43f5e;
  --violet-compute: #8b5cf6;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, Menlo, monospace;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.8125rem, 0.76rem + 0.3vw, 0.875rem);
  --text-base: clamp(0.9375rem, 0.88rem + 0.35vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.45vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.15rem + 0.65vw, 1.5rem);
  --text-2xl: clamp(1.6rem, 1.4rem + 1.2vw, 2.2rem);
  --text-3xl: clamp(2.2rem, 1.8rem + 2vw, 3.4rem);
  --text-hero: clamp(2.8rem, 2.2rem + 3vw, 4.6rem);

  /* Spacing */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;

  /* Layout & Geometry */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 18px;
  --max-width: 1400px;
  --header-height: 72px;

  /* Transitions */
  --ease-out-cubic: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 160ms var(--ease-out-cubic);
  --transition-normal: 260ms var(--ease-out-cubic);
}

/* ==========================================================================
   2. GLOBAL RESET & BASE STYLES
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  background-color: var(--bg-base);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-base);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 229, 255, 0.04) 0%, transparent 60%),
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 48px 48px, 48px 48px;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--cyan-primary);
  outline-offset: 3px;
}

/* ==========================================================================
   3. NAVIGATION HEADER
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header.scrolled {
  background: rgba(6, 9, 15, 0.94);
  border-bottom-color: rgba(0, 229, 255, 0.2);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.header-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  color: var(--cyan-primary);
  filter: drop-shadow(0 0 8px var(--cyan-glow));
}

.brand-name {
  font-size: 1.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.brand-name .highlight {
  color: var(--cyan-primary);
  font-family: var(--font-mono);
  font-weight: 800;
}

.brand-tagline {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: var(--font-mono);
  display: none;
}

@media (min-width: 900px) {
  .brand-tagline { display: inline-block; }
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

@media (min-width: 860px) {
  .nav-links { display: flex; }
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: var(--space-2xs) var(--space-xs);
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  color: var(--cyan-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.currency-select-wrap {
  position: relative;
}

.currency-select {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 6px 12px;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
}

.currency-select:hover, .currency-select:focus {
  border-color: var(--cyan-primary);
}

.btn-bom-trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
  transition: all var(--transition-fast);
  position: relative;
}

.btn-bom-trigger:hover {
  border-color: var(--cyan-primary);
  box-shadow: 0 0 14px rgba(0, 229, 255, 0.2);
}

.bom-badge {
  background: var(--cyan-primary);
  color: #06090f;
  font-size: 0.6875rem;
  font-weight: 800;
  padding: 1px 6px;
  border-radius: 10px;
}

.bom-badge.hidden {
  display: none;
}

.btn-noc-header {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(244, 63, 94, 0.12);
  border: 1px solid rgba(244, 63, 94, 0.35);
  border-radius: var(--radius-md);
  padding: 8px 14px;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 600;
  color: #fb7185;
  transition: all var(--transition-fast);
}

.btn-noc-header:hover {
  background: rgba(244, 63, 94, 0.2);
  border-color: var(--rose-alert);
  box-shadow: 0 0 14px rgba(244, 63, 94, 0.25);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #f43f5e;
  box-shadow: 0 0 8px #f43f5e;
  animation: pulseBeacon 1.8s infinite;
}

@keyframes pulseBeacon {
  0% { transform: scale(0.9); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.5; }
  100% { transform: scale(0.9); opacity: 1; }
}

.mobile-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}

@media (min-width: 860px) {
  .mobile-toggle { display: none; }
}

.mobile-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
}

/* Mobile dropdown */
@media (max-width: 859px) {
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-surface-1);
    border-bottom: 1px solid var(--border-subtle);
    padding: var(--space-lg);
    gap: var(--space-md);
  }
}

/* ==========================================================================
   4. HERO TELEMETRY SECTION
   ========================================================================== */
.hero-section {
  position: relative;
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-background-art {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.22;
  background-image: url('../assets/hero-datacenter.jpg');
  background-size: cover;
  background-position: center;
  filter: saturate(1.2) contrast(1.1);
  mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at center, black 30%, transparent 80%);
}

.hero-container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

@media (min-width: 1024px) {
  .hero-container {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

.hero-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--cyan-primary);
}

.badge-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.badge-status-dot.online {
  background: var(--emerald-status);
  box-shadow: 0 0 8px var(--emerald-status);
}

.badge-status-dot.warning {
  background: var(--amber-warning);
  box-shadow: 0 0 8px var(--amber-warning);
}

.badge-status-dot.alert {
  background: var(--rose-alert);
  box-shadow: 0 0 8px var(--rose-alert);
}

.hero-title {
  font-size: var(--text-hero);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-title .text-gradient {
  background: linear-gradient(135deg, #ffffff 30%, var(--cyan-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 620px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-xs);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--cyan-primary);
  color: #06090f;
  font-weight: 600;
  font-size: var(--text-sm);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
}

.btn-primary:hover {
  background: #38edff;
  transform: translateY(-2px);
  box-shadow: 0 4px 26px rgba(0, 229, 255, 0.45);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-weight: 600;
  font-size: var(--text-sm);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.btn-secondary:hover {
  border-color: var(--cyan-primary);
  background: var(--bg-surface-3);
  color: var(--cyan-primary);
}

.hero-metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

.metric-card {
  display: flex;
  flex-direction: column;
}

.metric-val {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.metric-label {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Hero Telemetry Card */
.hero-telemetry-hud {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  position: relative;
  overflow: hidden;
}

.hero-telemetry-hud::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan-primary), transparent);
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--space-md);
}

.hud-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--cyan-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.hud-live-tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--emerald-status);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
}

.hud-stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.hud-stat-box {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
}

.hud-stat-num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
}

.hud-stat-desc {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.hud-terminal-preview {
  background: #030508;
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #a5b4fc;
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.hud-terminal-preview .line {
  margin-bottom: 4px;
}

.hud-terminal-preview .green { color: var(--emerald-status); }
.hud-terminal-preview .cyan { color: var(--cyan-primary); }

/* ==========================================================================
   5. INTERACTIVE NETWORK PACKET FLOW & FAILOVER CANVAS
   ========================================================================== */
.section-wrapper {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: var(--space-3xl) var(--space-lg);
}

.section-head {
  text-align: center;
  max-width: 780px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}

.section-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--cyan-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs);
  display: block;
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section-sub {
  font-size: var(--text-base);
  color: var(--text-secondary);
}

.network-canvas-card {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  position: relative;
}

.network-controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-surface-2);
  border-bottom: 1px solid var(--border-subtle);
  gap: var(--space-sm);
}

.scenario-buttons-group {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.btn-scenario {
  padding: 8px 14px;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 600;
  background: var(--bg-surface-3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-scenario:hover {
  color: var(--text-primary);
  border-color: var(--cyan-primary);
}

.btn-scenario.active {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.25);
}

.status-live-banner {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.canvas-container {
  position: relative;
  width: 100%;
  background: radial-gradient(circle at center, #0c1524 0%, #06090f 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

#networkCanvas {
  display: block;
  width: 100%;
  cursor: crosshair;
}

.network-telemetry-hud {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-surface-2);
  border-top: 1px solid var(--border-subtle);
  gap: var(--space-md);
}

@media (min-width: 768px) {
  .network-telemetry-hud {
    grid-template-columns: repeat(4, 1fr);
  }
}

.net-hud-item {
  display: flex;
  flex-direction: column;
}

.net-hud-val {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--cyan-primary);
}

.net-hud-label {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  text-transform: uppercase;
}

/* ==========================================================================
   6. 42U SERVER RACK CONFIGURATOR
   ========================================================================== */
.rack-configurator-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  align-items: start;
}

@media (min-width: 1024px) {
  .rack-configurator-grid {
    grid-template-columns: 320px 1fr 340px;
  }
}

/* Palette Sidebar */
.rack-palette-panel {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
}

.panel-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.panel-desc {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.palette-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-height: 580px;
  overflow-y: auto;
  padding-right: 4px;
}

.palette-item {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.palette-item:hover {
  border-color: rgba(0, 229, 255, 0.4);
  background: var(--bg-surface-3);
}

.palette-item.selected {
  border-color: var(--cyan-primary);
  background: rgba(0, 229, 255, 0.1);
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.15);
}

.palette-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.palette-u-tag {
  background: #030712;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--cyan-primary);
}

.palette-name {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.palette-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.palette-price {
  color: var(--emerald-status);
  font-weight: 700;
}

/* Rack Chassis Viewport */
.rack-viewport-panel {
  background: #04070c;
  border: 2px solid #1a2536;
  border-radius: var(--radius-xl);
  padding: var(--space-md);
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.8), 0 20px 40px rgba(0, 0, 0, 0.6);
}

.rack-chassis-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: var(--space-sm);
}

.rack-chassis-title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.rack-preset-buttons {
  display: flex;
  gap: 6px;
}

.btn-preset {
  padding: 4px 10px;
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-preset:hover {
  color: var(--cyan-primary);
  border-color: var(--cyan-primary);
}

.rack-slots-container {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-height: 720px;
  overflow-y: auto;
  padding-right: 4px;
}

.rack-slot {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 24px;
  background: #080e16;
  border-radius: 3px;
  padding: 2px 6px;
  border-left: 3px solid #1e293b;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  transition: all var(--transition-fast);
}

.rack-slot.empty {
  cursor: pointer;
  border-left-color: #334155;
}

.rack-slot.empty:hover {
  background: #0f1c2d;
  border-left-color: var(--cyan-primary);
}

.rack-slot.occupied {
  min-height: calc(24px * var(--u-span, 1));
  padding: 4px 8px;
  border-left-width: 4px;
}

.slot-number {
  color: #64748b;
  font-size: 0.625rem;
  min-width: 24px;
}

.slot-content {
  flex: 1;
  display: flex;
  align-items: center;
}

.slot-placeholder {
  color: #475569;
}

.btn-slot-mount {
  color: #64748b;
  font-weight: 700;
  font-size: 0.875rem;
  padding: 0 4px;
}

.rack-slot.empty:hover .btn-slot-mount {
  color: var(--cyan-primary);
}

.slot-hardware {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 8px;
  border-radius: 3px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.hardware-info {
  display: flex;
  flex-direction: column;
}

.hardware-name {
  color: #f8fafc;
  font-weight: 600;
  font-size: 0.75rem;
}

.hardware-spec {
  color: #94a3b8;
  font-size: 0.625rem;
}

.hardware-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hardware-badge {
  font-size: 0.5625rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 3px;
  text-transform: uppercase;
}

.hardware-power {
  color: #38bdf8;
  font-size: 0.6875rem;
}

.btn-remove-slot {
  color: #f43f5e;
  font-size: 1rem;
  line-height: 1;
  padding: 0 4px;
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.btn-remove-slot:hover {
  opacity: 1;
}

/* Rack Telemetry Sidebar */
.rack-telemetry-panel {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.rack-occupancy-card {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.occupancy-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.occupancy-bar-track {
  height: 8px;
  background: #030712;
  border-radius: 4px;
  overflow: hidden;
}

.occupancy-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-primary), #3b82f6);
  border-radius: 4px;
  transition: width 300ms ease;
}

.telemetry-specs-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.telemetry-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px;
  background: var(--bg-surface-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
}

.telemetry-row-label {
  color: var(--text-secondary);
}

.telemetry-row-val {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
}

.rack-capex-card {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.08), rgba(16, 25, 38, 0.8));
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  text-align: center;
}

.capex-label {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.capex-val {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--cyan-primary);
  margin-block: 4px;
}

.rack-action-buttons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ==========================================================================
   7. ENTERPRISE STORAGE (NAS/SAN) IOPS & CAPACITY SIZER
   ========================================================================== */
.storage-sizer-card {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 960px) {
  .storage-sizer-card {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.sizer-inputs-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  justify-content: space-between;
}

.storage-preset-bar {
  display: flex;
  gap: 6px;
  margin-bottom: 4px;
}

.btn-storage-preset {
  flex: 1;
  padding: 6px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.btn-storage-preset.active {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
}

.form-input, .form-select {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 14px;
  color: var(--text-primary);
  font-size: var(--text-sm);
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  border-color: var(--cyan-primary);
}

.form-range {
  accent-color: var(--cyan-primary);
  height: 6px;
  border-radius: 3px;
  background: var(--bg-surface-3);
  margin-top: 6px;
}

.sizer-results-column {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.results-heading {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-sm);
}

.capacity-callout-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
}

.cap-callout-box {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  text-align: center;
}

.cap-callout-num {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--cyan-primary);
}

.cap-callout-label {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

/* ==========================================================================
   8. HARDWARE STORE CATALOG WITH CONTAINER QUERIES
   ========================================================================== */
.catalog-tabs-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-2xl);
}

.filter-tab-btn {
  padding: 10px 18px;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: 999px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.filter-tab-btn:hover {
  color: var(--text-primary);
  border-color: rgba(0, 229, 255, 0.4);
}

.filter-tab-btn.active {
  background: var(--cyan-primary);
  color: #06090f;
  border-color: var(--cyan-primary);
  box-shadow: 0 0 16px rgba(0, 229, 255, 0.35);
}

/* Container Queries for Hardware Cards */
.catalog-products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}

.hardware-card {
  container-type: inline-size;
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.hardware-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 229, 255, 0.1);
}

.hardware-card-media {
  position: relative;
  aspect-ratio: 16 / 10;
  background: #020408;
  overflow: hidden;
}

.hardware-card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms var(--ease-out-cubic);
}

.hardware-card:hover .hardware-card-media img {
  transform: scale(1.05);
}

.hardware-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(6, 9, 15, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 3px 8px;
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  color: var(--cyan-primary);
  text-transform: uppercase;
}

.lead-time-pill {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(16, 185, 129, 0.9);
  color: #030712;
  font-size: 0.625rem;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 3px 8px;
  border-radius: 999px;
}

.hardware-card-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.hardware-title {
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.hardware-desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: var(--space-md);
  flex: 1;
}

.hardware-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: var(--space-lg);
  font-size: var(--text-xs);
  color: #cbd5e1;
  font-family: var(--font-mono);
}

.spec-bullet {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan-primary);
  margin-right: 6px;
}

.hardware-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-md);
  gap: var(--space-sm);
}

.price-stack {
  display: flex;
  flex-direction: column;
}

.price-label {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

.price-val {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
}

/* @container Query: wide cards adapt button layout */
@container (min-width: 440px) {
  .hardware-card-body {
    padding: var(--space-xl);
  }
}

/* ==========================================================================
   9. TURNKEY ENGINEERING SERVICES & SLA TIERS
   ========================================================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.service-card {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.service-card:hover {
  border-color: rgba(0, 229, 255, 0.4);
  transform: translateY(-4px);
}

.service-icon-box {
  width: 48px;
  height: 48px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cyan-primary);
  margin-bottom: var(--space-md);
}

.service-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.service-text {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   10. TOP-LAYER ACCESSIBLE DIALOG MODALS WITH @starting-style
   ========================================================================== */
/* BOM Drawer (Slide-over) */
dialog#bomDrawer {
  position: fixed;
  inset-block-start: 0;
  inset-block-end: 0;
  inset-inline-end: 0;
  inset-inline-start: auto;
  margin: 0;
  inline-size: min(560px, 100vw);
  block-size: 100dvh;
  max-block-size: 100dvh;
  border: none;
  border-left: 1px solid var(--border-subtle);
  background: var(--bg-surface-1);
  color: var(--text-primary);
  padding: var(--space-xl);
  box-shadow: -20px 0 50px rgba(0, 0, 0, 0.8);
  overflow-y: auto;
  display: flex;
  flex-direction: column;

  /* Modern Discrete Transitions */
  opacity: 0;
  transform: translateX(100%);
  transition-property: opacity, transform, display, overlay;
  transition-duration: 0.35s;
  transition-timing-function: var(--ease-out-cubic);
  transition-behavior: allow-discrete;
}

dialog#bomDrawer[open] {
  opacity: 1;
  transform: translateX(0);

  @starting-style {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* NOC Modal (Centered Modal) */
dialog#nocModal {
  position: fixed;
  inset: 0;
  margin: auto;
  inline-size: min(640px, 92vw);
  max-block-size: 90dvh;
  border: 1px solid rgba(244, 63, 94, 0.4);
  border-radius: var(--radius-xl);
  background: #090e17;
  color: var(--text-primary);
  padding: var(--space-xl);
  box-shadow: 0 0 50px rgba(244, 63, 94, 0.25), 0 25px 50px rgba(0, 0, 0, 0.8);
  overflow-y: auto;

  opacity: 0;
  transform: scale(0.92);
  transition-property: opacity, transform, display, overlay;
  transition-duration: 0.3s;
  transition-timing-function: var(--ease-out-cubic);
  transition-behavior: allow-discrete;
}

dialog#nocModal[open] {
  opacity: 1;
  transform: scale(1);

  @starting-style {
    opacity: 0;
    transform: scale(0.92);
  }
}

/* Backdrop Blur & Transitions */
dialog::backdrop {
  background-color: rgba(3, 5, 8, 0);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  transition-property: background-color, backdrop-filter, display, overlay;
  transition-duration: 0.35s;
  transition-timing-function: var(--ease-out-cubic);
  transition-behavior: allow-discrete;
}

dialog[open]::backdrop {
  background-color: rgba(3, 5, 8, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);

  @starting-style {
    background-color: rgba(3, 5, 8, 0);
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
  }
}

/* Reduced Motion Safety */
@media (prefers-reduced-motion: reduce) {
  dialog#bomDrawer, dialog#nocModal {
    transform: none !important;
    transition-duration: 0.1s !important;
  }
  dialog#bomDrawer[open], dialog#nocModal[open] {
    @starting-style {
      transform: none !important;
    }
  }
}

/* Modal Inner Components */
.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: var(--space-lg);
}

.drawer-title {
  font-size: var(--text-xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-close-dialog {
  font-size: 1.5rem;
  line-height: 1;
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

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

.bom-items-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.bom-line-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  gap: var(--space-sm);
}

.bom-line-info {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.bom-line-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-primary);
}

.bom-line-rate {
  font-size: 0.6875rem;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.bom-line-qty {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #04070c;
  border-radius: var(--radius-sm);
  padding: 2px 6px;
}

.btn-qty-minus, .btn-qty-plus {
  color: var(--cyan-primary);
  font-weight: 700;
  padding: 0 4px;
}

.qty-display {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  min-width: 18px;
  text-align: center;
}

.bom-line-subtotal {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--emerald-status);
  min-width: 70px;
  text-align: right;
}

.btn-remove-line {
  color: var(--rose-alert);
  font-size: 1.25rem;
  line-height: 1;
}

.empty-bom-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-md);
  color: var(--text-tertiary);
}

.bom-options-box {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.bom-checkbox-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  padding-block: 4px;
}

.bom-totals-card {
  background: #03060a;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.bom-total-row {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  padding-block: 3px;
}

.bom-total-row.grand {
  border-top: 1px solid var(--border-subtle);
  padding-top: 8px;
  margin-top: 4px;
  font-size: var(--text-base);
  font-weight: 800;
  color: var(--cyan-primary);
  font-family: var(--font-mono);
}

/* ==========================================================================
   11. FOOTER
   ========================================================================== */
.site-footer {
  background: #030508;
  border-top: 1px solid var(--border-subtle);
  padding-block: var(--space-3xl) var(--space-xl);
  margin-top: var(--space-3xl);
}

.footer-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

@media (min-width: 860px) {
  .footer-inner {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-col-title {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-md);
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.footer-links-list a:hover {
  color: var(--cyan-primary);
}

.footer-bottom {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
  padding-top: var(--space-xl);
  margin-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  gap: var(--space-md);
}