/* ===================================================================
   BITZ NET // DEEP SPACE TELEMETRY INTERFACE SYSTEM
   Aesthetic: Quiet, Precise, Weightless (深空遥测风格)
   Colors:
     - Deep Void: #05070D
     - Star Text: #E6EEF9
     - Sub Text:  #7C8BA5
     - Mint Cyan: #23E6C8
     - Hairline:  rgba(230, 238, 249, 0.12)
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  --bg-space: #05070D;
  --bg-card: rgba(8, 12, 22, 0.65);
  --text-primary: #E6EEF9;
  --text-secondary: #7C8BA5;
  --accent-cyan: #23E6C8;
  --accent-cyan-dim: rgba(35, 230, 200, 0.15);
  --accent-cyan-glow: rgba(35, 230, 200, 0.35);
  --hairline: rgba(230, 238, 249, 0.12);
  --hairline-bright: rgba(230, 238, 249, 0.25);
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1240px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-space);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-space);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    linear-gradient(to right, rgba(230, 238, 249, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(230, 238, 249, 0.03) 1px, transparent 1px);
  background-size: 64px 64px;
}

/* Background Subtle Radial Glow */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 80vh;
  max-width: 1400px;
  background: radial-gradient(ellipse 60% 40% at 50% 10%, rgba(35, 230, 200, 0.04), transparent 75%);
  pointer-events: none;
  z-index: 0;
}

/* Base Typo */
a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-smooth), border-color var(--transition-smooth);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.mono-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-cyan);
}

.telemetry-coord {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
  opacity: 0.7;
}

.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  position: relative;
  z-index: 1;
}

/* Hairline Grid Dividers */
.hairline-top {
  border-top: 1px solid var(--hairline);
}
.hairline-bottom {
  border-bottom: 1px solid var(--hairline);
}

/* ===================================================================
   NAVIGATION BAR
   =================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 7, 13, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--hairline);
  transition: border-color var(--transition-smooth);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Telemetry Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.logo-graphic {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

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

.nav-link.active,
.nav-link.highlight {
  color: var(--accent-cyan);
}

.nav-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 1px 5px;
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
  border-radius: 2px;
  letter-spacing: 0.05em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Ghost Buttons (Telemetry Component) */
.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--hairline);
  padding: 0.65rem 1.4rem;
  border-radius: 2px;
  cursor: pointer;
  transition: all var(--transition-smooth);
  white-space: nowrap;
}

.ghost-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 16px var(--accent-cyan-dim);
}

.ghost-btn-primary {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(35, 230, 200, 0.05);
}

.ghost-btn-primary:hover {
  background: var(--accent-cyan);
  color: var(--bg-space);
  box-shadow: 0 0 24px var(--accent-cyan-glow);
}

.ghost-btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.75rem;
}

.ghost-btn-lg {
  padding: 0.85rem 1.85rem;
  font-size: 0.9rem;
}

/* ===================================================================
   HERO AREA
   =================================================================== */
.hero-section {
  position: relative;
  padding: 5.5rem 0 4.5rem;
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}

.hero-telemetry-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--hairline);
}

.hero-content {
  max-width: 900px;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  font-weight: 700;
}

.hero-title span.brand-accent {
  color: var(--accent-cyan);
  position: relative;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2.2rem;
  max-width: 820px;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 3.5rem;
}

/* Metric Blocks (Slender, Oversized) */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--hairline);
}

.stat-block {
  border-left: 1px solid var(--hairline);
  padding-left: 1.25rem;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 0.35rem;
  letter-spacing: -0.03em;
}

.stat-value span.cyan-mark {
  color: var(--accent-cyan);
  font-size: 0.8em;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-secondary);
}

/* ===================================================================
   SECTION COMMONS
   =================================================================== */
.section-padding {
  padding: 5rem 0;
  border-bottom: 1px solid var(--hairline);
  position: relative;
}

.section-header {
  margin-bottom: 3rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.section-telemetry-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.4rem);
  font-weight: 700;
}

.section-desc {
  max-width: 680px;
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   FEATURES (3 CARDS - HAIRLINE SEPARATED)
   =================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--hairline);
}

.feature-card {
  padding: 2.5rem 2rem;
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--transition-smooth), background-color var(--transition-smooth);
  background: transparent;
  position: relative;
}

.feature-card:last-child {
  border-right: none;
}

.feature-card:hover {
  background-color: rgba(35, 230, 200, 0.02);
}

.card-telemetry-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.feature-icon-svg {
  width: 44px;
  height: 44px;
  margin-bottom: 1.5rem;
  stroke: var(--accent-cyan);
  fill: none;
}

.feature-title {
  font-size: 1.3rem;
  margin-bottom: 0.85rem;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.feature-specs {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1rem;
}

.feature-specs li::before {
  content: "> ";
  color: var(--accent-cyan);
}

/* ===================================================================
   STREAMING & AI SUPPORT CARDS
   =================================================================== */
.media-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--hairline);
}

.media-ai-col {
  padding: 3rem 2.5rem;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--hairline);
}

.media-ai-col:last-child {
  border-right: none;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.5rem 0 2rem;
}

.stream-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border: 1px solid var(--hairline);
  padding: 0.4rem 0.85rem;
  color: var(--text-primary);
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.stream-badge span.dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
}

.telemetry-metrics-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid var(--hairline);
}

/* ===================================================================
   PRICING COMPARISON TABLE (HAIRLINE GRID)
   =================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--hairline);
}

.pricing-card {
  padding: 3rem 2rem;
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
}

.pricing-card:last-child {
  border-right: none;
}

.pricing-card.featured {
  background: rgba(35, 230, 200, 0.03);
}

.pricing-card.featured::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 12px var(--accent-cyan);
}

.pricing-tier-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--accent-cyan);
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.pricing-name {
  font-size: 1.45rem;
  margin-bottom: 0.5rem;
}

.pricing-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  min-height: 42px;
  margin-bottom: 1.5rem;
}

.pricing-price-row {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--hairline);
}

.price-currency {
  font-size: 1.25rem;
  color: var(--accent-cyan);
}

.price-amount {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.price-cycle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.pricing-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2.5rem;
  flex-grow: 1;
}

.pricing-specs-list li {
  font-size: 0.9rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.pricing-specs-list li.dim {
  color: var(--text-secondary);
  opacity: 0.6;
}

.pricing-specs-list li svg {
  width: 16px;
  height: 16px;
  stroke: var(--accent-cyan);
  flex-shrink: 0;
}

.pricing-specs-list li.dim svg {
  stroke: var(--text-secondary);
}

/* ===================================================================
   USER REVIEWS / TELEMETRY LOGS
   =================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--hairline);
}

.review-card {
  padding: 2.2rem 1.8rem;
  border-right: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-card:last-child {
  border-right: none;
}

.review-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.reviewer-meta {
  display: flex;
  flex-direction: column;
}

.reviewer-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.reviewer-role {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

.review-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

.review-telemetry-ping {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-cyan);
  border-top: 1px solid var(--hairline);
  padding-top: 0.85rem;
}

/* ===================================================================
   FAQ ACCORDION (PURE CSS/DETAILS OR HAIRLINE CARDS)
   =================================================================== */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--hairline);
}

.faq-item {
  padding: 2rem 2.2rem;
  border-bottom: 1px solid var(--hairline);
  border-right: 1px solid var(--hairline);
}

.faq-item:nth-child(2n) {
  border-right: none;
}

.faq-item:nth-last-child(1),
.faq-item:nth-last-child(2) {
  border-bottom: none;
}

.faq-q {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
}

.faq-q::before {
  content: "Q.";
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  font-size: 0.95rem;
}

.faq-a {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding-left: 1.6rem;
}

/* ===================================================================
   FOOTER (STRICT 4 TITLES, NEW WINDOW)
   =================================================================== */
.site-footer {
  padding: 4rem 0 3rem;
  background: #030509;
  border-top: 1px solid var(--hairline);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--hairline);
}

.footer-brand-summary {
  max-width: 420px;
}

.footer-nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.footer-link {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: color var(--transition-smooth);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

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

.footer-link::after {
  content: "↗";
  font-size: 0.85em;
  opacity: 0.6;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}

/* ===================================================================
   CONTENT / ARTICLE PAGES STYLES
   =================================================================== */
.article-header {
  padding: 4rem 0 2.5rem;
  border-bottom: 1px solid var(--hairline);
}

.article-body {
  padding: 3rem 0 5rem;
  max-width: 860px;
  margin: 0 auto;
}

.article-body h2 {
  font-size: 1.6rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--hairline);
  color: var(--text-primary);
}

.article-body h3 {
  font-size: 1.25rem;
  margin: 1.8rem 0 0.8rem;
  color: var(--accent-cyan);
}

.article-body p {
  font-size: 1rem;
  color: #C1CDE0;
  line-height: 1.85;
  margin-bottom: 1.5rem;
}

.article-body ul, .article-body ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: #C1CDE0;
}

.article-body li {
  margin-bottom: 0.65rem;
  line-height: 1.75;
}

.article-body blockquote {
  border-left: 2px solid var(--accent-cyan);
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  background: rgba(35, 230, 200, 0.03);
  color: var(--text-primary);
  font-style: normal;
}

.article-dofollow-box {
  border: 1px solid var(--accent-cyan-dim);
  background: rgba(35, 230, 200, 0.02);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  border-radius: 2px;
}

.article-dofollow-link {
  color: var(--accent-cyan);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.article-dofollow-link:hover {
  color: #fff;
}

/* Article List Grid for Insights Page */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border: 1px solid var(--hairline);
}

.insight-card {
  padding: 2.5rem;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
}

.insight-card:nth-child(2n) {
  border-right: none;
}

.insight-card:hover {
  background: rgba(35, 230, 200, 0.02);
}

.insight-card:hover .insight-card-title {
  color: var(--accent-cyan);
}

.insight-card-title {
  font-size: 1.25rem;
  margin-bottom: 0.85rem;
  transition: color var(--transition-smooth);
}

/* ===================================================================
   RESPONSIVE QUERIES (@media)
   Strict Mobile Single Column, Touch friendly buttons (>44px height)
   =================================================================== */
@media (max-width: 1024px) {
  .features-grid,
  .pricing-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
  }

  .feature-card,
  .pricing-card,
  .review-card {
    border-right: none;
    border-bottom: 1px solid var(--hairline);
  }

  .hero-stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
  }

  .media-ai-grid {
    grid-template-columns: 1fr;
  }

  .media-ai-col {
    border-right: none;
    border-bottom: 1px solid var(--hairline);
  }

  .faq-grid {
    grid-template-columns: 1fr;
  }

  .faq-item {
    border-right: none;
  }

  .faq-item:nth-last-child(2) {
    border-bottom: 1px solid var(--hairline);
  }
}

@media (max-width: 768px) {
  body {
    background-size: 32px 32px;
  }

  .header-inner {
    height: 64px;
  }

  .nav-menu {
    display: none; /* Mobile menu can be accessed or simplified */
  }

  .hero-section {
    padding: 3.5rem 0 3rem;
  }

  .hero-telemetry-status {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .hero-cta-group {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .hero-cta-group .ghost-btn {
    width: 100%;
    min-height: 48px;
    font-size: 0.92rem;
  }

  .hero-stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .stat-block {
    padding-left: 0.85rem;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
  }

  .footer-nav-links {
    flex-direction: column;
    gap: 1.25rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .insights-grid {
    grid-template-columns: 1fr;
  }

  .insight-card {
    border-right: none;
  }

  .ghost-btn {
    min-height: 46px;
    padding: 0.75rem 1.25rem;
  }
}