/* ==========================================================================
   大象网络机场 (ElephantRoute) - 暗网黑客卡牌风核心设计系统
   Theme: Cyberpunk NFT / Card Collectors (Dark Gold / Neon Glitch Art)
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-black: #06080d;
  --bg-card: rgba(13, 17, 27, 0.82);
  --bg-card-hover: rgba(19, 25, 40, 0.95);
  --bg-surface: #0c101a;
  --bg-panel: rgba(16, 21, 35, 0.7);

  /* Cyber Accents */
  --neon-cyan: #00f3ff;
  --neon-cyan-glow: rgba(0, 243, 255, 0.35);
  --neon-pink: #ff007b;
  --neon-pink-glow: rgba(255, 0, 123, 0.35);
  --neon-purple: #a855f7;
  --neon-purple-glow: rgba(168, 85, 247, 0.4);
  --neon-green: #10f983;
  --neon-green-glow: rgba(16, 249, 131, 0.35);
  --neon-gold: #ffbe1a;
  --neon-gold-glow: rgba(255, 190, 26, 0.45);
  --cyber-orange: #ff5500;

  /* Rarity Gradients */
  --r-tier-glow: #00c8ff;
  --sr-tier-glow: #bd00ff;
  --ssr-tier-glow: #ffb700;
  --ur-tier-glow: #ff003c;

  /* Typography */
  --font-display: 'Rajdhani', 'Orbitron', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  /* Layout */
  --container-max: 1240px;
  --nav-height: 74px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-cyber: 12px;

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-normal: 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Reset & Box Sizing */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-black);
  color: #e2e8f0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-black);
  color: #d1d5db;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Global Selection */
::selection {
  background: var(--neon-cyan);
  color: #000;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 7px;
}
::-webkit-scrollbar-track {
  background: #090c13;
}
::-webkit-scrollbar-thumb {
  background: #1f293d;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--neon-cyan);
}

/* Scanline Overlay & Cyber Grid Background */
.cyber-scanline {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
  background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%);
  background-size: 100% 4px;
  opacity: 0.2;
}

#matrixCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  pointer-events: none;
  opacity: 0.38;
}

.ambient-noise-layer {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-image: 
    radial-gradient(circle at 15% 20%, rgba(0, 243, 255, 0.07) 0%, transparent 40%),
    radial-gradient(circle at 85% 60%, rgba(189, 0, 255, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 50% 90%, rgba(255, 190, 26, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

/* Cyber Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.mono {
  font-family: var(--font-mono);
}

.text-gradient-cyan {
  background: linear-gradient(135deg, #ffffff 10%, var(--neon-cyan) 85%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-gold {
  background: linear-gradient(135deg, #fff2ad 0%, var(--neon-gold) 60%, #df8b00 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-rainbow {
  background: linear-gradient(90deg, #ff007b, #00f3ff, #ffb700, #00ff66, #bd00ff);
  background-size: 300% 100%;
  animation: rainbowFlow 6s linear infinite;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

@keyframes rainbowFlow {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Cyber Button Base */
.btn-cyber {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-decoration: none;
  color: #000;
  background: var(--neon-cyan);
  border: 1px solid var(--neon-cyan);
  clip-path: polygon(12px 0%, 100% 0%, calc(100% - 12px) 100%, 0% 100%);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: 0 0 20px var(--neon-cyan-glow);
}

.btn-cyber::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transition: 0.5s;
}

.btn-cyber:hover::before {
  left: 100%;
}

.btn-cyber:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 35px var(--neon-cyan);
  background: #fff;
  color: #000;
}

.btn-cyber-gold {
  background: linear-gradient(135deg, #ffc93c 0%, #ff9900 100%);
  border-color: #ffc93c;
  color: #000;
  box-shadow: 0 0 25px var(--neon-gold-glow);
}
.btn-cyber-gold:hover {
  box-shadow: 0 0 40px #ffc93c;
  background: #ffea78;
}

.btn-cyber-outline {
  background: transparent;
  color: var(--neon-cyan);
  border: 1px solid var(--neon-cyan);
  box-shadow: none;
}
.btn-cyber-outline:hover {
  background: rgba(0, 243, 255, 0.12);
  color: #fff;
  box-shadow: 0 0 20px var(--neon-cyan-glow);
}

/* Top Marquee Banner */
.top-broadcast-bar {
  background: rgba(8, 12, 19, 0.95);
  border-bottom: 1px solid rgba(0, 243, 255, 0.25);
  padding: 8px 16px;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  position: relative;
  z-index: 101;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(8px);
}

.broadcast-content {
  display: flex;
  align-items: center;
  gap: 14px;
  overflow: hidden;
  white-space: nowrap;
  flex: 1;
}

.broadcast-tag {
  background: rgba(255, 0, 123, 0.2);
  border: 1px solid var(--neon-pink);
  color: #ff3399;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.5px;
}

.broadcast-tag .pulse-dot {
  width: 6px;
  height: 6px;
  background: #ff007b;
  border-radius: 50%;
  animation: blink 1.2s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.8); }
}

.broadcast-ticker {
  display: inline-block;
  color: #cbd5e1;
  font-size: 0.82rem;
  letter-spacing: 0.5px;
  animation: tickerSlide 25s linear infinite;
}

@keyframes tickerSlide {
  0% { transform: translateX(10%); }
  100% { transform: translateX(-50%); }
}

.broadcast-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
}

.coupon-badge {
  background: rgba(255, 190, 26, 0.15);
  border: 1px dashed var(--neon-gold);
  color: var(--neon-gold);
  padding: 2px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.coupon-badge:hover {
  background: var(--neon-gold);
  color: #000;
}

/* Main Navigation */
.cyber-nav {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(6, 9, 14, 0.88);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 100;
  transition: all var(--transition-normal);
}

.cyber-nav.scrolled {
  border-bottom-color: rgba(0, 243, 255, 0.3);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-symbol {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, rgba(0, 243, 255, 0.2), rgba(168, 85, 247, 0.2));
  border: 1px solid var(--neon-cyan);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 0 15px var(--neon-cyan-glow);
  position: relative;
  overflow: hidden;
}

.logo-symbol::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(0, 243, 255, 0.3), transparent);
  transform: rotate(45deg);
  animation: shine 4s infinite;
}

@keyframes shine {
  0% { transform: translateX(-100%) rotate(45deg); }
  50%, 100% { transform: translateX(100%) rotate(45deg); }
}

.brand-text h1 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: #fff;
  line-height: 1.1;
  text-transform: uppercase;
}

.brand-text span {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--neon-cyan);
  letter-spacing: 2px;
  display: block;
}

.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 28px;
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 600;
  color: #94a3b8;
  text-decoration: none;
  letter-spacing: 0.8px;
  transition: all var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--neon-cyan);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--neon-cyan);
  box-shadow: 0 0 8px var(--neon-cyan);
  transition: width var(--transition-fast);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-badge-new {
  background: var(--neon-pink);
  color: #fff;
  font-size: 0.65rem;
  padding: 1px 5px;
  border-radius: 3px;
  margin-left: 4px;
  font-family: var(--font-mono);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid rgba(0, 243, 255, 0.4);
  color: var(--neon-cyan);
  padding: 8px 12px;
  border-radius: 4px;
  font-size: 1.2rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 80px 0 60px;
  position: relative;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 16px;
  background: rgba(0, 243, 255, 0.08);
  border: 1px solid rgba(0, 243, 255, 0.3);
  border-radius: 30px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--neon-cyan);
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(0, 243, 255, 0.15);
}

.hero-badge-pill .pill-dot {
  width: 8px;
  height: 8px;
  background: var(--neon-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--neon-green);
}

.hero-title {
  font-family: var(--font-display);
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.12;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.glitch-text {
  position: relative;
  display: inline-block;
}

.hero-description {
  font-size: 1.12rem;
  color: #94a3b8;
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-features-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 36px;
}

.strip-item {
  background: rgba(15, 20, 31, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.07);
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-fast);
}
.strip-item:hover {
  border-color: var(--neon-cyan);
  background: rgba(0, 243, 255, 0.05);
}

.strip-icon {
  font-size: 1.3rem;
}
.strip-meta h4 {
  font-size: 0.88rem;
  color: #fff;
  font-weight: 700;
}
.strip-meta p {
  font-size: 0.74rem;
  color: #64748b;
  font-family: var(--font-mono);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

/* Hacker Interactive Terminal on Hero Right */
.cyber-terminal {
  background: rgba(10, 13, 20, 0.92);
  border: 1px solid rgba(0, 243, 255, 0.35);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 30px rgba(0, 243, 255, 0.12);
  position: relative;
}

.terminal-header {
  background: #0d121c;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-dots {
  display: flex;
  gap: 6px;
}

.terminal-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.terminal-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #64748b;
}

.terminal-badge {
  background: rgba(16, 249, 131, 0.15);
  border: 1px solid var(--neon-green);
  color: var(--neon-green);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 1px 7px;
  border-radius: 3px;
}

.terminal-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.8;
  color: #94a3b8;
  max-height: 380px;
  overflow-y: auto;
}

.terminal-line {
  margin-bottom: 6px;
}
.terminal-line .t-cyan { color: var(--neon-cyan); }
.terminal-line .t-green { color: var(--neon-green); font-weight: 700; }
.terminal-line .t-gold { color: var(--neon-gold); }
.terminal-line .t-pink { color: var(--neon-pink); }
.terminal-line .t-muted { color: #475569; }

.terminal-metrics-box {
  background: rgba(0, 0, 0, 0.4);
  border: 1px dashed rgba(0, 243, 255, 0.3);
  padding: 12px;
  border-radius: 6px;
  margin: 14px 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  text-align: center;
  gap: 8px;
}
.metric-col .metric-val {
  font-size: 1.2rem;
  font-weight: 800;
  color: #fff;
}
.metric-col .metric-lbl {
  font-size: 0.7rem;
  color: #64748b;
}

/* ==========================================================================
   Section 1: Live Node Matrix & Latency (节点延迟与状态板块)
   ========================================================================== */
.section-wrapper {
  padding: 90px 0;
  position: relative;
}

.section-head {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--neon-cyan);
  letter-spacing: 2.5px;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: inline-block;
}

.section-title {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: #8892b0;
  max-width: 680px;
  margin: 0 auto;
}

.node-matrix-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.filter-tabs {
  display: flex;
  gap: 8px;
  background: rgba(15, 20, 32, 0.8);
  padding: 5px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.filter-btn {
  background: transparent;
  border: none;
  color: #8892b0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 7px 16px;
  border-radius: 5px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn.active, .filter-btn:hover {
  background: rgba(0, 243, 255, 0.15);
  color: var(--neon-cyan);
}

.node-status-ticker {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: #64748b;
}

.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.node-card {
  background: rgba(14, 19, 31, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-cyber);
  padding: 20px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
}

.node-card:hover {
  transform: translateY(-4px);
  border-color: var(--neon-cyan);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6), 0 0 20px rgba(0, 243, 255, 0.18);
}

.node-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.node-flag-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-flag {
  font-size: 1.4rem;
}

.node-title-box h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
}

.node-title-box span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #64748b;
}

.node-protocol-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 3px;
  background: rgba(0, 243, 255, 0.1);
  border: 1px solid rgba(0, 243, 255, 0.3);
  color: var(--neon-cyan);
}

.node-specs-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 14px 0;
  padding: 10px 0;
  border-top: 1px dashed rgba(255, 255, 255, 0.08);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.spec-item {
  display: flex;
  flex-direction: column;
}
.spec-label {
  color: #64748b;
  font-size: 0.68rem;
}
.spec-value {
  color: #e2e8f0;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.ping-indicator {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 6px var(--neon-green);
}

.node-unlock-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.chip {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  padding: 2px 7px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.05);
  color: #94a3b8;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.chip.active {
  background: rgba(16, 249, 131, 0.1);
  color: var(--neon-green);
  border-color: rgba(16, 249, 131, 0.3);
}

/* ==========================================================================
   Section 3: Core Advantages (核心优势六边形矩阵)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.advantage-card {
  background: rgba(14, 19, 31, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-cyber);
  padding: 32px 26px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.advantage-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 243, 255, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8), 0 0 25px rgba(0, 243, 255, 0.15);
}

.advantage-card:hover::before {
  opacity: 1;
}

.adv-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 12px;
  background: rgba(0, 243, 255, 0.08);
  border: 1px solid rgba(0, 243, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 22px;
  color: var(--neon-cyan);
  transition: all var(--transition-fast);
}

.advantage-card:hover .adv-icon-box {
  background: var(--neon-cyan);
  color: #000;
  box-shadow: 0 0 20px var(--neon-cyan);
}

.adv-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.adv-desc {
  font-size: 0.95rem;
  color: #8892b0;
  line-height: 1.65;
}

.adv-metric-tag {
  display: inline-block;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 3px 10px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--neon-cyan);
  border: 1px solid rgba(0, 243, 255, 0.2);
}

/* ==========================================================================
   Section 4: FAQ手风琴板块
   ========================================================================== */
.faq-container {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: rgba(14, 19, 31, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(0, 243, 255, 0.3);
}

.faq-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-question {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: #f1f5f9;
  display: flex;
  align-items: center;
  gap: 12px;
}

.faq-question .q-prefix {
  color: var(--neon-cyan);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.faq-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neon-cyan);
  font-size: 1.2rem;
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  color: var(--neon-pink);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
  color: #94a3b8;
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

/* ==========================================================================
   Section 5: User Reviews (用户评价 / 极客公会雷达)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  background: rgba(14, 19, 31, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-cyber);
  padding: 26px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-card:hover {
  border-color: rgba(0, 243, 255, 0.35);
  transform: translateY(-4px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.7);
}

.review-user-info {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.user-avatar-cyber {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 2px solid var(--neon-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  background: rgba(0, 243, 255, 0.1);
  box-shadow: 0 0 10px var(--neon-cyan-glow);
}

.user-meta h4 {
  font-size: 1rem;
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 6px;
}

.verified-icon {
  color: var(--neon-green);
  font-size: 0.85rem;
}

.user-role-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--neon-cyan);
}

.review-text {
  font-size: 0.94rem;
  color: #94a3b8;
  line-height: 1.65;
  margin-bottom: 20px;
}

.review-telemetry {
  background: rgba(0, 0, 0, 0.35);
  border-radius: 6px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: #64748b;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.telemetry-val {
  color: var(--neon-green);
  font-weight: 700;
}

/* ==========================================================================
   Section 6: Knowledge Base Transition Banner (单独板块引导跳转)
   ========================================================================== */
.kb-portal-banner {
  background: linear-gradient(135deg, rgba(14, 21, 37, 0.95), rgba(28, 16, 48, 0.95));
  border: 1px solid rgba(168, 85, 247, 0.4);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 40px rgba(168, 85, 247, 0.2);
}

.kb-portal-banner::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.3) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.kb-banner-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  position: relative;
  z-index: 2;
}

.kb-banner-text h3 {
  font-family: var(--font-display);
  font-size: 2rem;
  color: #fff;
  font-weight: 800;
  margin-bottom: 10px;
}

.kb-banner-text p {
  font-size: 1rem;
  color: #cbd5e1;
  max-width: 640px;
  line-height: 1.6;
}

.kb-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.kb-preview-pill {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 3px 10px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: #d8b4fe;
  border-radius: 4px;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.cyber-footer {
  background: #040609;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 60px 0 30px;
  margin-top: 80px;
  font-size: 0.9rem;
  color: #64748b;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  line-height: 1.6;
  max-width: 320px;
  color: #8892b0;
}

.footer-col h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #8892b0;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: var(--neon-cyan);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* Floating Audio / Quick Action HUD */
.audio-toggle-hud {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 99;
  background: rgba(10, 14, 22, 0.9);
  border: 1px solid rgba(0, 243, 255, 0.4);
  padding: 10px 16px;
  border-radius: 30px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.6), 0 0 15px rgba(0, 243, 255, 0.2);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.audio-toggle-hud:hover {
  transform: translateY(-2px);
  border-color: var(--neon-cyan);
}
.audio-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 14px;
}
.audio-bar {
  width: 3px;
  background: var(--neon-cyan);
  height: 4px;
  border-radius: 1px;
}
.audio-active .audio-bar:nth-child(1) { animation: soundBar 0.8s ease-in-out infinite; }
.audio-active .audio-bar:nth-child(2) { animation: soundBar 1.1s ease-in-out 0.2s infinite; }
.audio-active .audio-bar:nth-child(3) { animation: soundBar 0.6s ease-in-out 0.4s infinite; }

@keyframes soundBar {
  0%, 100% { height: 4px; }
  50% { height: 14px; }
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .advantages-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-title {
    font-size: 2.3rem;
  }
  .hero-features-strip {
    grid-template-columns: 1fr;
  }
  .advantages-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .kb-banner-content {
    flex-direction: column;
    align-items: flex-start;
  }
}