/* ============================================================
   鹿语云机场 (LUYUYUN) - Acid Lab Cyberpunk / Modern Dark Tech Theme
   Domain: luyuyunvpn.click
   ============================================================ */

:root {
  --bg-primary: #07070b;
  --bg-secondary: #0d0d14;
  --bg-card: #12121c;
  --bg-card-hover: #181826;
  --bg-card-alt: #0a0a10;
  
  --text-primary: #f0f3f8;
  --text-secondary: #9aa3b2;
  --text-muted: #626a7a;
  
  --accent-green: #00ff66;
  --accent-green-bright: #39ff14;
  --accent-green-dark: #008736;
  --accent-green-glow: rgba(0, 255, 102, 0.25);
  
  --accent-purple: #a855f7;
  --accent-purple-glow: rgba(168, 85, 247, 0.25);
  --accent-pink: #ec4899;
  --accent-cyan: #06b6d4;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(0, 255, 102, 0.4);
  --border-card: rgba(30, 41, 59, 0.8);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* Background Gradients & Ambient Glow */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-glow::before {
  content: '';
  position: absolute;
  top: -10vw;
  right: -5vw;
  width: 55vw;
  height: 55vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 255, 102, 0.12) 0%, rgba(168, 85, 247, 0.08) 45%, transparent 70%);
  filter: blur(80px);
  animation: pulseGlow 14s ease-in-out infinite alternate;
}

.ambient-glow::after {
  content: '';
  position: absolute;
  bottom: 10vh;
  left: -10vw;
  width: 50vw;
  height: 50vw;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.12) 0%, rgba(236, 72, 153, 0.06) 50%, transparent 75%);
  filter: blur(90px);
  animation: pulseGlow 18s ease-in-out infinite alternate-reverse;
}

@keyframes pulseGlow {
  0% { transform: scale(0.9) translate(0, 0); opacity: 0.7; }
  100% { transform: scale(1.15) translate(30px, 40px); opacity: 1; }
}

/* Subtle Grid Background Pattern */
.bg-grid {
  background-size: 40px 40px;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography & Headings */
h1, h2, h3, h4, h5, h6 {
  color: #ffffff;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); margin-bottom: 1rem; }
h3 { font-size: 1.4rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.15rem; margin-bottom: 0.5rem; }

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

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

/* ============================================================
   Navbar
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 7, 11, 0.85);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.85rem 0;
  transition: var(--transition);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.01em;
}

.brand-logo .logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-green) 0%, var(--accent-purple) 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  font-weight: 900;
  box-shadow: 0 0 16px var(--accent-green-glow);
}

.brand-logo .brand-highlight {
  color: var(--accent-green);
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 0.4rem 0.2rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-green);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-green);
  transition: width 0.2s ease;
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background: var(--accent-green);
  color: #050b07;
  font-weight: 700;
  box-shadow: 0 0 20px rgba(0, 255, 102, 0.35);
}

.btn-primary:hover {
  background: #39ff14;
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 255, 102, 0.6);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--accent-green);
  background: rgba(0, 255, 102, 0.05);
  color: var(--accent-green);
}

.btn-glow-purple {
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2) 0%, rgba(236, 72, 153, 0.2) 100%);
  border: 1px solid rgba(168, 85, 247, 0.4);
  color: #fff;
}

.btn-glow-purple:hover {
  border-color: var(--accent-purple);
  box-shadow: 0 0 25px var(--accent-purple-glow);
  transform: translateY(-2px);
}

/* Mobile Nav Toggle */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero-section {
  padding: 5.5rem 0 4rem;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.95fr;
  align-items: center;
  gap: 3.5rem;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(0, 255, 102, 0.08);
  border: 1px solid rgba(0, 255, 102, 0.3);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-green);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

.hero-tag .pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-green);
  animation: blink 2s infinite ease-in-out;
}

@keyframes blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  margin-bottom: 1.25rem;
  line-height: 1.15;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 30%, var(--accent-green) 70%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
  max-width: 620px;
}

.hero-buttons {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.stat-item .stat-num {
  font-size: 1.85rem;
  font-weight: 800;
  color: #fff;
  display: block;
}

.stat-item .stat-num span {
  color: var(--accent-green);
  font-size: 1.3rem;
}

.stat-item .stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Acid Visual Element (Fig 2 Inspired) */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.acid-disc-wrap {
  position: relative;
  width: 340px;
  height: 340px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.acid-outer-ring {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  border: 1px dashed rgba(0, 255, 102, 0.3);
  animation: rotateClockwise 25s linear infinite;
}

.acid-disc {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: conic-gradient(from 180deg at 50% 50%, #00ff66 0deg, #a855f7 140deg, #ec4899 230deg, #00ff66 360deg);
  position: relative;
  box-shadow: 0 0 70px rgba(0, 255, 102, 0.35), 0 0 100px rgba(168, 85, 247, 0.25);
  animation: rotateCounter 18s linear infinite;
  display: flex;
  align-items: center;
  justify-content: center;
}

.acid-disc-inner {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.9);
  z-index: 2;
  text-align: center;
}

.acid-disc-inner .disc-val {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent-green);
  font-family: var(--font-mono);
}

.acid-disc-inner .disc-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

@keyframes rotateClockwise {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rotateCounter {
  from { transform: rotate(0deg); }
  to { transform: rotate(-360deg); }
}

/* Floating Metrics Badges */
.floating-badge {
  position: absolute;
  padding: 0.75rem 1.1rem;
  background: rgba(18, 18, 28, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  z-index: 3;
}

.badge-top-left {
  top: 10px;
  left: -20px;
  animation: floatSlow 5s ease-in-out infinite;
}

.badge-bottom-right {
  bottom: 20px;
  right: -20px;
  animation: floatSlow 6s ease-in-out infinite reverse;
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.badge-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.indicator-green { background: var(--accent-green); box-shadow: 0 0 8px var(--accent-green); }
.indicator-purple { background: var(--accent-purple); box-shadow: 0 0 8px var(--accent-purple); }

.badge-text-title { font-size: 0.85rem; font-weight: 700; color: #fff; }
.badge-text-sub { font-size: 0.75rem; color: var(--text-muted); }

/* ============================================================
   Section Headers
   ============================================================ */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-green);
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
}

/* ============================================================
   Advantage Feature Grid (优势)
   ============================================================ */
.features-section {
  padding: 5rem 0;
  position: relative;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 1.75rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4), 0 0 25px rgba(0, 255, 102, 0.08);
}

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

.feature-icon-box {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(0, 255, 102, 0.1);
  border: 1px solid rgba(0, 255, 102, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
}

.feature-card.purple-accent .feature-icon-box {
  background: rgba(168, 85, 247, 0.1);
  border-color: rgba(168, 85, 247, 0.3);
}

.feature-card h3 {
  font-size: 1.3rem;
  color: #fff;
  margin-bottom: 0.85rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.feature-specs {
  list-style: none;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
}

.feature-specs li {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.feature-specs li span.bullet {
  color: var(--accent-green);
  font-weight: bold;
}

/* ============================================================
   Pricing Section (套餐 - Reference Fig 1)
   ============================================================ */
.pricing-section {
  padding: 5.5rem 0;
  position: relative;
  background: rgba(10, 10, 16, 0.6);
}

.pricing-filter-bar {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: rgba(0, 255, 102, 0.12);
  color: var(--accent-green);
  border-color: var(--accent-green);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.75rem;
}

/* Pricing Card Component (Fig 1 Exact Replication & Extensions) */
.pricing-card {
  background: #0d1117;
  border: 1px solid #1f2937;
  border-radius: var(--radius-lg);
  padding: 2rem 1.75rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 255, 102, 0.4);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5), 0 0 25px rgba(0, 255, 102, 0.12);
}

/* Featured Card (like Riding / 乘风 in Fig 1) */
.pricing-card.featured {
  background: #0e161c;
  border: 1.5px solid var(--accent-green);
  box-shadow: 0 0 35px rgba(0, 255, 102, 0.18);
  transform: scale(1.02);
}

.pricing-card.featured:hover {
  transform: scale(1.02) translateY(-6px);
}

.card-top-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
}

.card-title-group h3 {
  font-size: 1.25rem;
  color: #fff;
  margin-bottom: 0.15rem;
}

.card-title-group .plan-en-name {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.card-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
}

.badge-green {
  background: rgba(0, 255, 102, 0.15);
  color: var(--accent-green);
  border: 1px solid rgba(0, 255, 102, 0.35);
}

.badge-purple {
  background: rgba(168, 85, 247, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(168, 85, 247, 0.35);
}

.badge-cyan {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.35);
}

/* Price Box */
.price-box {
  background: #090d12;
  border: 1px solid #1a222d;
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.price-box .price-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.price-box .price-amount {
  font-size: 2rem;
  font-weight: 900;
  color: var(--accent-green);
  font-family: var(--font-sans);
  line-height: 1;
}

.price-box .price-amount .currency {
  font-size: 1.3rem;
  font-weight: 700;
  margin-right: 0.15rem;
}

.price-box .price-amount .period {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Traffic Box (Fig 1 style) */
.traffic-box {
  background: rgba(0, 255, 102, 0.04);
  border: 1px solid rgba(0, 255, 102, 0.15);
  border-radius: var(--radius-sm);
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  font-size: 0.88rem;
}

.traffic-box .traffic-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.traffic-box .traffic-value {
  color: #fff;
  font-weight: 700;
  font-family: var(--font-mono);
}

/* Feature List */
.plan-details-title {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.plan-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.plan-features li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  margin-bottom: 0.65rem;
  line-height: 1.45;
}

.plan-features li .check-icon {
  color: var(--accent-green);
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 1px;
}

/* Subscription Button (Fig 1 Button) */
.btn-card-subscribe {
  width: 100%;
  padding: 0.85rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid #1f2937;
  color: #fff;
}

.btn-card-subscribe:hover {
  background: rgba(0, 255, 102, 0.12);
  border-color: var(--accent-green);
  color: var(--accent-green);
}

.pricing-card.featured .btn-card-subscribe {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: #041008;
  box-shadow: 0 0 20px rgba(0, 255, 102, 0.4);
}

.pricing-card.featured .btn-card-subscribe:hover {
  background: #39ff14;
  box-shadow: 0 0 30px rgba(0, 255, 102, 0.65);
}

/* 10th Card Special Neon Border Pulse */
.pricing-card.tier-10 {
  border: 1.5px solid var(--accent-purple);
  background: linear-gradient(180deg, #140d21 0%, #0d1117 100%);
}

.pricing-card.tier-10:hover {
  border-color: #d946ef;
  box-shadow: 0 0 35px var(--accent-purple-glow);
}

.pricing-card.tier-10 .btn-card-subscribe {
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-pink));
  color: #fff;
  border: none;
}

/* ============================================================
   Featured Master Technical Article Section
   ============================================================ */
.master-article-section {
  padding: 5.5rem 0;
  position: relative;
}

.article-hero-box {
  background: #0f131c;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 3.5rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}

.article-meta-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  margin-bottom: 2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1.25rem;
}

.article-meta-bar span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.article-tag-badge {
  background: rgba(0, 255, 102, 0.1);
  color: var(--accent-green);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.article-prose {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #c9d1d9;
}

.article-prose h2 {
  font-size: 1.75rem;
  color: #fff;
  margin: 2.5rem 0 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.article-prose h3 {
  font-size: 1.35rem;
  color: #e6edf3;
  margin: 2rem 0 1rem;
}

.article-prose p {
  margin-bottom: 1.4rem;
  color: #cbd5e1;
}

/* Quantified Table */
.data-table-wrap {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: #0a0e14;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.data-table th {
  background: #141c26;
  color: #fff;
  padding: 1rem 1.25rem;
  font-weight: 700;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.data-table td {
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
}

.data-table tr:hover td {
  background: rgba(0, 255, 102, 0.03);
}

.data-table td.highlight {
  color: var(--accent-green);
  font-weight: 600;
  font-family: var(--font-mono);
}

/* Code Snippet Box */
.code-block {
  background: #090d14;
  border: 1px solid #1a2433;
  border-radius: var(--radius-md);
  margin: 1.75rem 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.code-header {
  background: #111823;
  padding: 0.6rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #1a2433;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.code-content {
  padding: 1.25rem;
  overflow-x: auto;
  line-height: 1.55;
  color: #9cdcfe;
}

.code-content pre {
  margin: 0;
}

/* Callout Box */
.callout {
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 1.75rem 0;
  border-left: 4px solid var(--accent-green);
  background: rgba(0, 255, 102, 0.05);
}

.callout.purple {
  border-left-color: var(--accent-purple);
  background: rgba(168, 85, 247, 0.05);
}

.callout-title {
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.4rem;
  font-size: 1rem;
}

.callout p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ============================================================
   Articles Knowledge Base (文章知识库)
   ============================================================ */
.knowledge-section {
  padding: 5.5rem 0;
  position: relative;
}

.kb-filter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2.5rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.kb-search-box {
  position: relative;
  min-width: 280px;
}

.kb-search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.6rem 1.25rem 0.6rem 2.5rem;
  color: #fff;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
}

.kb-search-input:focus {
  border-color: var(--accent-green);
  box-shadow: 0 0 15px var(--accent-green-glow);
}

.kb-search-icon {
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.kb-tag-pills {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.kb-pill {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.kb-pill:hover,
.kb-pill.active {
  background: rgba(0, 255, 102, 0.12);
  color: var(--accent-green);
  border-color: var(--accent-green);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 2rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 255, 102, 0.35);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.article-card .card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.article-card .card-tag {
  color: var(--accent-green);
  font-weight: 600;
  background: rgba(0, 255, 102, 0.08);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}

.article-card h3 {
  font-size: 1.2rem;
  color: #fff;
  line-height: 1.4;
  margin-bottom: 0.75rem;
}

.article-card h3 a:hover {
  color: var(--accent-green);
}

.article-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.article-card-footer .stats {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.article-card-footer .read-more {
  color: var(--accent-green);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.article-card-footer .read-more:hover {
  transform: translateX(3px);
}

/* ============================================================
   FAQ Section (常见问题 - 40 Items Categorized)
   ============================================================ */
.faq-section {
  padding: 5.5rem 0;
  position: relative;
  background: rgba(10, 10, 16, 0.8);
}

.faq-category-nav {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.faq-tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.faq-tab-btn:hover,
.faq-tab-btn.active {
  background: var(--accent-green);
  color: #041008;
  border-color: var(--accent-green);
  box-shadow: 0 0 20px rgba(0, 255, 102, 0.3);
}

.faq-accordion-group {
  max-width: 900px;
  margin: 0 auto;
  display: none;
}

.faq-accordion-group.active {
  display: block;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--accent-green);
}

.faq-chevron {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform 0.3s ease;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
  color: var(--accent-green);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  background: rgba(0, 0, 0, 0.2);
}

.faq-item.open .faq-answer {
  max-height: 500px;
  padding: 0 1.5rem 1.25rem;
}

.faq-answer p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.65;
  margin-bottom: 0;
}

/* ============================================================
   SEO Keywords & Cloud Section
   ============================================================ */
.seo-cloud-section {
  padding: 3.5rem 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(0, 0, 0, 0.3);
}

.keyword-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
}

.keyword-tag {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.07);
  color: var(--text-muted);
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  transition: var(--transition);
}

.keyword-tag:hover {
  color: var(--accent-green);
  border-color: var(--accent-green);
  background: rgba(0, 255, 102, 0.05);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: #040407;
  padding: 4.5rem 0 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
}

.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 0.65rem;
}

.footer-col ul li a {
  color: var(--text-muted);
}

.footer-col ul li a:hover {
  color: var(--accent-green);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 2rem;
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ============================================================
   Single Article Detail Layout & Styling
   ============================================================ */
.article-detail-header {
  padding: 4.5rem 0 2.5rem;
  text-align: center;
  background: radial-gradient(circle at center, rgba(0, 255, 102, 0.06) 0%, transparent 70%);
}

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.breadcrumb a:hover {
  color: var(--accent-green);
}

.article-main-container {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 1.5rem 5rem;
}

.author-card-box {
  background: #0d121c;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin: 3rem 0;
}

.author-avatar {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-green), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #000;
  font-size: 1.4rem;
}

.related-articles-box {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
}

/* Mobile Responsiveness */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-desc {
    margin: 0 auto 2rem;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-stats-row {
    justify-content: center;
  }
  
  .hero-visual {
    margin-top: 2rem;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: #0a0a12;
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-subtle);
    gap: 1rem;
  }
  
  .nav-links.open {
    display: flex;
  }
  
  .mobile-toggle {
    display: block;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}