/* Monochrome Blueprint / Wireframe Design Tokens */
:root {
  --bg-canvas: #F4F4F5;
  --bg-surface: #FFFFFF;
  --border-color: #18181B;
  --border-muted: #E4E4E7;
  --text-main: #09090B;
  --text-muted: #71717A;
  --text-dim: #A1A1AA;
  --accent-black: #000000;
  --accent-white: #FFFFFF;
  
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  
  --grid-size: 24px;
}

/* Dark Mode Overrides (if needed or preferred) */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-canvas: #09090B;
    --bg-surface: #18181B;
    --border-color: #27272A;
    --border-muted: #3F3F46;
    --text-main: #FAFAFA;
    --text-muted: #A1A1AA;
    --text-dim: #71717A;
    --accent-black: #FFFFFF;
    --accent-white: #000000;
  }
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-mono);
  background-color: var(--bg-canvas);
  color: var(--text-main);
  line-height: 1.6;
}

/* Blueprint Grid Background */
body {
  min-height: 100vh;
  background-image: 
    linear-gradient(to right, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.05) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
  position: relative;
  overflow-x: hidden;
}

/* Technical Blueprint Container & Layout */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Target Crosshair Decoration */
.crosshair {
  position: relative;
}
.crosshair::before, .crosshair::after {
  content: "";
  position: absolute;
  background: var(--text-main);
}
.crosshair-tl::before { top: -4px; left: -4px; width: 9px; height: 1px; }
.crosshair-tl::after { top: -4px; left: -4px; width: 1px; height: 9px; }

/* Wireframe Button (CTA) */
.btn-blueprint {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent-black);
  color: var(--accent-white);
  padding: 12px 24px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--accent-black);
  position: relative;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-blueprint:hover {
  background: var(--accent-white);
  color: var(--accent-black);
  box-shadow: 4px 4px 0px var(--accent-black);
}

.btn-blueprint .corner-mark {
  position: absolute;
  width: 5px;
  height: 5px;
  border: 1px solid currentColor;
}
.btn-blueprint .cm-tl { top: -2px; left: -2px; border-right: 0; border-bottom: 0; }
.btn-blueprint .cm-tr { top: -2px; right: -2px; border-left: 0; border-bottom: 0; }
.btn-blueprint .cm-bl { bottom: -2px; left: -2px; border-right: 0; border-top: 0; }
.btn-blueprint .cm-br { bottom: -2px; right: -2px; border-left: 0; border-top: 0; }

/* Blueprint Card */
.blueprint-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  position: relative;
  padding: 24px;
}

.blueprint-card::before {
  content: "+";
  position: absolute;
  top: -8px;
  left: -5px;
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--text-main);
  background: var(--bg-canvas);
  padding: 0 2px;
}

.blueprint-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 10px;
  margin-bottom: 16px;
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* Header & Nav */
header.site-header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(244, 244, 245, 0.95);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo-brand {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-brand .badge {
  font-size: 10px;
  padding: 2px 6px;
  border: 1px solid var(--text-main);
  text-transform: uppercase;
}

nav.main-nav {
  display: flex;
  gap: 24px;
}

nav.main-nav a {
  color: var(--text-main);
  text-decoration: none;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 6px 0;
  position: relative;
}

nav.main-nav a:hover {
  text-decoration: underline;
  text-underline-offset: 6px;
}

/* Hero Section */
.hero-section {
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border-color);
}

.spec-bar {
  display: flex;
  gap: 20px;
  font-size: 12px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-muted);
  padding-bottom: 8px;
  margin-bottom: 24px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.hero-title {
  font-size: 38px;
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.hero-subtitle {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.hero-specs-box {
  border: 1px solid var(--border-color);
  padding: 16px;
  background: var(--bg-surface);
  margin-bottom: 24px;
}

.hero-specs-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  padding: 4px 0;
  border-bottom: 1px dashed var(--border-muted);
}
.hero-specs-row:last-child {
  border-bottom: none;
}

/* Wireframe Visual Canvas */
.wireframe-visual {
  border: 1px solid var(--border-color);
  background: #000000;
  color: #00FF66;
  padding: 24px;
  font-family: var(--font-mono);
  min-height: 320px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.terminal-header {
  display: flex;
  justify-content: space-between;
  color: #888;
  font-size: 11px;
  border-bottom: 1px solid #333;
  padding-bottom: 8px;
}

.node-pulse-list {
  margin: 20px 0;
  font-size: 13px;
}

.node-item {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid #111;
}

.status-online {
  color: #00FF66;
}

/* Node Latency Section */
.section-padding {
  padding: 60px 0;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  font-size: 24px;
  font-weight: 800;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
}

.nodes-table th, .nodes-table td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--border-color);
  font-size: 13px;
}

.nodes-table th {
  background: var(--bg-canvas);
  text-transform: uppercase;
  font-size: 12px;
}

.latency-badge {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--border-color);
  font-size: 11px;
  font-weight: 700;
}

.lat-fast { background: #E6F4EA; color: #137333; border-color: #CEEAD6; }
.lat-low { background: #E8F0FE; color: #1A73E8; border-color: #D2E3FC; }

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 32px 24px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.pricing-card.featured {
  border: 2px solid var(--accent-black);
  box-shadow: 6px 6px 0px rgba(0, 0, 0, 0.1);
}

.pricing-tag {
  position: absolute;
  top: -12px;
  right: 16px;
  background: var(--accent-black);
  color: var(--accent-white);
  font-size: 10px;
  padding: 2px 8px;
  text-transform: uppercase;
}

.price-amount {
  font-size: 36px;
  font-weight: 900;
  margin: 16px 0 8px;
}

.price-period {
  font-size: 13px;
  color: var(--text-muted);
}

.feature-list {
  list-style: none;
  margin: 24px 0;
  flex-grow: 1;
}

.feature-list li {
  font-size: 13px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Advantages Grid */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.adv-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 24px;
}

.adv-num {
  font-size: 24px;
  font-weight: 900;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border-muted);
  padding-bottom: 8px;
  margin-bottom: 12px;
}

.adv-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
}

.adv-desc {
  font-size: 13px;
  color: var(--text-muted);
}

/* Articles & Knowledge Base Grid */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.kb-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.2s ease;
}

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

.kb-tag {
  font-size: 10px;
  text-transform: uppercase;
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  display: inline-block;
  margin-bottom: 12px;
  width: fit-content;
}

.kb-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.4;
}

.kb-desc {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.kb-link {
  font-size: 12px;
  font-weight: 700;
  text-decoration: none;
  color: var(--text-main);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.kb-link:hover {
  text-decoration: underline;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 20px;
}

.faq-question {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.faq-answer {
  font-size: 14px;
  color: var(--text-muted);
  padding-left: 28px;
}

/* Reviews Grid */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.review-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  padding: 20px;
}

.review-user {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--border-muted);
  padding-bottom: 8px;
}

.user-name {
  font-weight: 700;
  font-size: 14px;
}

.user-role {
  font-size: 11px;
  color: var(--text-dim);
}

.review-text {
  font-size: 13px;
  color: var(--text-muted);
}

/* Footer */
footer.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  font-size: 12px;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  nav.main-nav {
    display: none;
  }
  .hero-title {
    font-size: 28px;
  }
}