/* ==========================================================================
   BiuBiu - Arcade Laser-Pulse Kinetic UI System
   Palette: Cathode Black (#090a10), Beam Magenta (#ff007f), Laser Cyan (#00f2fe), Photon White
   1px Phosphorescent Boundaries, Modular Acrylic Containers, Monospace Telemetry
   ========================================================================== */

:root {
  /* Daytime Arcade Mode (Default: Light Retro-Arcade High Energy) */
  --bg-cathode: #f6f8fc;
  --bg-acrylic: rgba(255, 255, 255, 0.88);
  --bg-acrylic-elevated: #ffffff;
  --bg-acrylic-subtle: #edf2f7;
  --bg-grid-line: rgba(0, 242, 254, 0.08);

  --text-photon: #0a0e1a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --beam-magenta: #ff007f;
  --beam-magenta-glow: rgba(255, 0, 127, 0.25);
  --laser-cyan: #00b4d8;
  --laser-cyan-glow: rgba(0, 180, 216, 0.25);
  --photon-white: #ffffff;
  --neon-amber: #f59e0b;

  --border-phosphor: rgba(0, 180, 216, 0.35);
  --border-magenta: rgba(255, 0, 127, 0.3);
  --border-dim: #e2e8f0;

  --laser-gradient: linear-gradient(135deg, #00b4d8 0%, #ff007f 100%);
  --laser-gradient-hover: linear-gradient(135deg, #0096c7 0%, #e0006f 100%);

  --shadow-acrylic: 0 10px 30px -5px rgba(0, 0, 0, 0.08);
  --shadow-neon: 0 0 25px rgba(0, 180, 216, 0.2);
  --shadow-magenta-glow: 0 0 25px rgba(255, 0, 127, 0.25);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --transition-laser: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  /* Nighttime Deep Cathode Mode (#090a10) */
  --bg-cathode: #090a10;
  --bg-acrylic: rgba(14, 18, 28, 0.82);
  --bg-acrylic-elevated: #121824;
  --bg-acrylic-subtle: #161e2e;
  --bg-grid-line: rgba(0, 242, 254, 0.07);

  --text-photon: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #090a10;

  --beam-magenta: #ff007f;
  --beam-magenta-glow: rgba(255, 0, 127, 0.45);
  --laser-cyan: #00f2fe;
  --laser-cyan-glow: rgba(0, 242, 254, 0.45);
  --photon-white: #ffffff;
  --neon-amber: #fbbf24;

  --border-phosphor: rgba(0, 242, 254, 0.3);
  --border-magenta: rgba(255, 0, 127, 0.35);
  --border-dim: rgba(255, 255, 255, 0.08);

  --laser-gradient: linear-gradient(135deg, #00f2fe 0%, #ff007f 100%);
  --laser-gradient-hover: linear-gradient(135deg, #38f9d7 0%, #ff1493 100%);

  --shadow-acrylic: 0 16px 40px -10px rgba(0, 0, 0, 0.7);
  --shadow-neon: 0 0 30px rgba(0, 242, 254, 0.3);
  --shadow-magenta-glow: 0 0 30px rgba(255, 0, 127, 0.35);
}

/* Base Styles & Arcade Grid Background */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-cathode);
  color: var(--text-photon);
  line-height: 1.65;
  transition: background-color 0.35s ease, color 0.35s ease;
  overflow-x: hidden;
  position: relative;
  /* Retrofuturistic Arcade Grid Blueprint */
  background-image: 
    linear-gradient(to right, var(--bg-grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--bg-grid-line) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* Kinetic Ballistic Canvas (Interactive Photon Pellets) */
#arcade-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all var(--transition-laser);
}

.mono-telemetry {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  letter-spacing: 0.5px;
}

.container {
  width: 100%;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Razor-sharp Phosphorescent Acrylic Container */
.acrylic-card {
  background: var(--bg-acrylic);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-phosphor);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-acrylic);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-laser), border-color var(--transition-laser), box-shadow var(--transition-laser);
}

.acrylic-card:hover {
  border-color: var(--laser-cyan);
  box-shadow: var(--shadow-neon);
}

/* Header & Nav */
.header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg-acrylic);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-phosphor);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--text-photon);
}

.laser-pulse-logo {
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--laser-cyan), var(--beam-magenta));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px var(--laser-cyan-glow);
  position: relative;
  overflow: hidden;
}

.laser-pulse-logo::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.8) 50%, transparent 60%);
  animation: logoLaserSweep 3s infinite linear;
}

@keyframes logoLaserSweep {
  0% { transform: translate(-30%, -30%) rotate(0deg); }
  100% { transform: translate(30%, 30%) rotate(360deg); }
}

.brand-logo span {
  background: var(--laser-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 900;
  text-shadow: 0 0 20px var(--beam-magenta-glow);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  position: relative;
  transition: all var(--transition-laser);
}

.nav-link:hover,
.nav-link.active {
  color: var(--laser-cyan);
  background: rgba(0, 242, 254, 0.08);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--laser-gradient);
  box-shadow: 0 0 8px var(--laser-cyan);
}

/* Special Highlighted Nav Item: 推荐资讯 */
.nav-link-news {
  color: var(--beam-magenta) !important;
  border: 1px solid var(--border-magenta);
  background: rgba(255, 0, 127, 0.06);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link-news:hover {
  background: rgba(255, 0, 127, 0.15) !important;
  box-shadow: 0 0 12px var(--beam-magenta-glow);
  transform: translateY(-1px);
}

.news-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--beam-magenta);
  box-shadow: 0 0 6px var(--beam-magenta);
  animation: pulseDot 1.5s infinite;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Exquisite Day/Night Mode Switch */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  background: var(--bg-acrylic-subtle);
  border: 1px solid var(--border-phosphor);
  color: var(--text-secondary);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-laser);
}

.theme-toggle:hover {
  border-color: var(--laser-cyan);
  color: var(--laser-cyan);
  box-shadow: 0 0 14px var(--laser-cyan-glow);
  transform: rotate(15deg);
}

.theme-icon-sun, .theme-icon-moon {
  width: 19px;
  height: 19px;
  position: absolute;
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.4s ease;
}

[data-theme="light"] .theme-icon-sun { opacity: 1; transform: scale(1) rotate(0deg); }
[data-theme="light"] .theme-icon-moon { opacity: 0; transform: scale(0.4) rotate(90deg); }
[data-theme="dark"] .theme-icon-sun { opacity: 0; transform: scale(0.4) rotate(-90deg); }
[data-theme="dark"] .theme-icon-moon { opacity: 1; transform: scale(1) rotate(0deg); }

/* Buttons */
.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 26px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  background: var(--laser-gradient);
  color: #ffffff !important;
  box-shadow: 0 0 20px var(--beam-magenta-glow);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-laser);
  white-space: nowrap;
}

.btn-cta::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: left 0.5s ease;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--beam-magenta-glow), 0 0 15px var(--laser-cyan-glow);
}

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

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--bg-acrylic-subtle);
  color: var(--text-photon);
  border: 1px solid var(--border-phosphor);
  transition: all var(--transition-laser);
  white-space: nowrap;
}

.btn-secondary:hover {
  border-color: var(--laser-cyan);
  color: var(--laser-cyan);
  box-shadow: 0 0 15px var(--laser-cyan-glow);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 15px 36px;
  font-size: 1.05rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 85px 0 75px;
  text-align: center;
  overflow: hidden;
}

.hero-laser-ambient {
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 480px;
  background: radial-gradient(circle, var(--laser-cyan-glow) 0%, var(--beam-magenta-glow) 40%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.telemetry-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 18px;
  border-radius: var(--radius-full);
  background: var(--bg-acrylic);
  border: 1px solid var(--border-phosphor);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--laser-cyan);
  margin-bottom: 26px;
  box-shadow: var(--shadow-neon);
}

.pulse-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--laser-cyan);
  box-shadow: 0 0 10px var(--laser-cyan);
  animation: pulseDot 1.8s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.4; }
  100% { transform: scale(1); opacity: 1; }
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -1.5px;
  margin-bottom: 22px;
  max-width: 950px;
  margin-left: auto;
  margin-right: auto;
}

.text-laser {
  background: var(--laser-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  filter: drop-shadow(0 0 18px var(--beam-magenta-glow));
}

.hero-brief-box {
  max-width: 820px;
  margin: 0 auto 36px;
  background: var(--bg-acrylic);
  border: 1px solid var(--border-dim);
  border-left: 3px solid var(--laser-cyan);
  border-radius: var(--radius-sm);
  padding: 16px 24px;
  text-align: left;
}

.brief-tag {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--laser-cyan);
  display: inline-block;
  margin-bottom: 4px;
}

.hero-desc {
  font-size: 1.12rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 45px;
}

.hero-telemetry-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  padding: 20px 24px;
  background: var(--bg-acrylic);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-md);
  max-width: 860px;
  margin: 0 auto;
}

.telemetry-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: left;
}

.telemetry-val {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-photon);
  line-height: 1;
}

.telemetry-val span {
  color: var(--laser-cyan);
}

.telemetry-lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Arcade Circuit / Regional Nodes Interactive Showcase
   Biu-Biu Laser Double-Burst on Node Hover
   ========================================================================== */
.circuit-showcase {
  margin-top: 50px;
  max-width: 1040px;
  margin-left: auto;
  margin-right: auto;
}

.circuit-board {
  padding: 28px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-phosphor);
  background: var(--bg-acrylic);
  position: relative;
  text-align: left;
}

.circuit-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-dim);
  padding-bottom: 16px;
  margin-bottom: 22px;
}

.circuit-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.1rem;
}

.circuit-status {
  font-size: 0.82rem;
  color: var(--laser-cyan);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Interactive Server Node Grid */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.server-node {
  background: var(--bg-acrylic-subtle);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  padding: 16px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-laser);
}

.server-node:hover {
  transform: translateY(-4px);
  border-color: var(--beam-magenta);
  box-shadow: 0 0 20px var(--beam-magenta-glow);
}

/* Double-burst "Biu-Biu" Laser Animation */
.server-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--laser-cyan), #ffffff);
  opacity: 0;
}

.server-node::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, #ffffff, var(--beam-magenta), transparent);
  opacity: 0;
}

.server-node:hover::before {
  opacity: 1;
  animation: biuLaserBurst 0.6s cubic-bezier(0.1, 0.9, 0.2, 1) infinite;
}

.server-node:hover::after {
  opacity: 1;
  animation: biuLaserBurstReverse 0.6s cubic-bezier(0.1, 0.9, 0.2, 1) infinite 0.15s;
}

@keyframes biuLaserBurst {
  0% { left: -100%; }
  100% { left: 100%; }
}

@keyframes biuLaserBurstReverse {
  0% { right: -100%; }
  100% { right: 100%; }
}

.node-flag {
  font-size: 1.3rem;
  margin-bottom: 6px;
}

.node-name {
  font-weight: 700;
  font-size: 0.92rem;
  margin-bottom: 4px;
}

.node-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.node-ping {
  color: var(--laser-cyan);
  font-weight: 700;
}

/* ==========================================================================
   Section Common
   ========================================================================== */
.section-wrap {
  padding: 95px 0;
  position: relative;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 58px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--beam-magenta);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   Core Advantages (3 Modular Cards)
   ========================================================================== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
}

.feature-laser-badge {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-sm);
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid var(--border-phosphor);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--laser-cyan);
  margin-bottom: 24px;
}

.feature-laser-badge.magenta {
  background: rgba(255, 0, 127, 0.1);
  border-color: var(--border-magenta);
  color: var(--beam-magenta);
}

.feature-card h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 22px;
}

.feature-telemetry-list {
  margin-top: auto;
  border-top: 1px solid var(--border-dim);
  padding-top: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.telemetry-row {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.telemetry-row svg {
  width: 16px;
  height: 16px;
  color: var(--laser-cyan);
  flex-shrink: 0;
}

/* ==========================================================================
   Spotlight Section: Streaming & AI Support Cards
   ========================================================================== */
.spotlight-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.spotlight-card {
  padding: 38px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.spotlight-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  margin-bottom: 16px;
}

.badge-magenta {
  background: rgba(255, 0, 127, 0.12);
  color: var(--beam-magenta);
  border: 1px solid var(--border-magenta);
}

.badge-cyan {
  background: rgba(0, 242, 254, 0.12);
  color: var(--laser-cyan);
  border: 1px solid var(--border-phosphor);
}

.spotlight-card h3 {
  font-size: 1.65rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.spotlight-card p {
  color: var(--text-secondary);
  font-size: 0.96rem;
  line-height: 1.7;
  margin-bottom: 26px;
}

.platform-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.arcade-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--bg-acrylic-subtle);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 600;
  transition: all var(--transition-laser);
}

.arcade-chip:hover {
  border-color: var(--laser-cyan);
  transform: translateY(-2px);
}

.spotlight-telemetry-box {
  background: var(--bg-acrylic-subtle);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  display: flex;
  justify-content: space-around;
  text-align: center;
}

.spotlight-stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-metric {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--laser-cyan);
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Realistic Pricing Comparison Table (网上真实专线套餐价格)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.pricing-card.featured {
  border: 2px solid var(--beam-magenta);
  box-shadow: var(--shadow-magenta-glow);
  transform: scale(1.03);
  z-index: 2;
}

.featured-arcade-tag {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--laser-gradient);
  color: #ffffff;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  box-shadow: 0 0 16px var(--beam-magenta);
}

.pricing-header {
  border-bottom: 1px solid var(--border-dim);
  padding-bottom: 22px;
  margin-bottom: 22px;
}

.plan-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 42px;
}

.plan-price-box {
  margin-top: 16px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency-sym {
  font-size: 1.4rem;
  font-weight: 800;
}

.price-num {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -1.5px;
  color: var(--text-photon);
}

.pricing-card.featured .price-num {
  background: var(--laser-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.price-cycle {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-specs {
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.spec-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.spec-item svg {
  width: 18px;
  height: 18px;
  color: var(--laser-cyan);
  flex-shrink: 0;
  margin-top: 2px;
}

.spec-item.disabled {
  color: var(--text-muted);
  text-decoration: line-through;
  opacity: 0.55;
}

.spec-item.disabled svg {
  color: var(--text-muted);
}

/* ==========================================================================
   User Reviews Section
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.review-card {
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  color: var(--neon-amber);
}

.review-quote {
  font-size: 0.96rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 22px;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.author-telemetry-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--laser-cyan), var(--beam-magenta));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  box-shadow: 0 0 10px var(--laser-cyan-glow);
}

.author-details {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 800;
}

.author-tag {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-box {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-card {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.faq-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 700;
  font-size: 1.05rem;
  user-select: none;
}

.faq-toggle-icon {
  width: 20px;
  height: 20px;
  color: var(--laser-cyan);
  transition: transform var(--transition-laser);
  flex-shrink: 0;
}

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.75;
  padding: 0 24px;
}

.faq-card.open .faq-body {
  max-height: 320px;
  padding: 0 24px 22px;
}

.faq-card.open .faq-toggle-icon {
  transform: rotate(180deg);
  color: var(--beam-magenta);
}

/* ==========================================================================
   Footer (Strictly 4 links only as required)
   ========================================================================== */
.footer {
  background: var(--bg-acrylic);
  border-top: 1px solid var(--border-phosphor);
  padding: 42px 0 32px;
  margin-top: 70px;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  margin-bottom: 24px;
}

.footer-link {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition-laser);
}

.footer-link:hover {
  color: var(--laser-cyan);
  text-shadow: 0 0 10px var(--laser-cyan-glow);
}

.footer-meta {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================================================
   News / Article Specific Layout (推荐资讯 feed-k82p.html)
   ========================================================================== */
.news-header {
  padding: 70px 0 45px;
  text-align: center;
  border-bottom: 1px solid var(--border-dim);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 40px;
}

.news-article-card {
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.news-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--laser-cyan);
  margin-bottom: 12px;
}

.news-title {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-photon);
}

.news-title:hover {
  color: var(--laser-cyan);
}

.news-summary {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.news-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag-pill {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--bg-acrylic-subtle);
  border: 1px solid var(--border-dim);
  color: var(--text-muted);
}

/* ==========================================================================
   Mobile Responsive (@media queries)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .advantages-grid,
  .pricing-grid,
  .reviews-grid,
  .nodes-grid,
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .spotlight-grid {
    grid-template-columns: 1fr;
  }
  .pricing-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  .nav-wrap {
    height: 66px;
  }
  .nav-menu {
    display: none;
  }
  .hero-section {
    padding: 50px 0 35px;
  }
  .hero-title {
    font-size: 2.15rem;
    letter-spacing: -0.5px;
  }
  .hero-desc {
    font-size: 1rem;
  }
  .hero-cta-group {
    flex-direction: column;
    gap: 12px;
  }
  .btn-cta, .btn-secondary {
    width: 100%;
    height: 52px;
    font-size: 1rem;
  }
  .hero-telemetry-bar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  .advantages-grid,
  .pricing-grid,
  .reviews-grid,
  .nodes-grid,
  .news-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .section-wrap {
    padding: 60px 0;
  }
  .section-title {
    font-size: 1.85rem;
  }
  .footer-nav {
    flex-wrap: wrap;
    gap: 16px 24px;
  }
}