/* ==========================================================================
   一元机场 (Yiyuan Airport) - Vibrant Streaming / Pop Tech Design System
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-dark: #070913;
  --bg-card: #0f1224;
  --bg-card-hover: #151933;
  --bg-card-subtle: #121528;
  --bg-card-glow: rgba(168, 85, 247, 0.08);

  --border-subtle: #1e2440;
  --border-hover: #2e3760;
  --border-highlight: #3b4270;
  --border-glow: #a855f7;

  /* Neon Gradients */
  --gradient-primary: linear-gradient(135deg, #a855f7 0%, #ec4899 50%, #f43f5e 100%);
  --gradient-card-hot: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
  --gradient-cyan: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
  --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  --gradient-border: linear-gradient(135deg, #a855f7, #ec4899, #06b6d4);
  --gradient-button: linear-gradient(90deg, #8b5cf6 0%, #3b82f6 100%);
  --gradient-button-hover: linear-gradient(90deg, #9333ea 0%, #2563eb 100%);
  
  /* Text Colors */
  --text-white: #ffffff;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-cyan: #22d3ee;
  --text-purple: #c084fc;
  --text-green: #10b981;
  --text-pink: #f472b6;

  /* Streaming Brand Badges */
  --badge-netflix: #e50914;
  --badge-youtube: #ff0000;
  --badge-disney: #0063e5;
  --badge-openai: #10a37f;
  --badge-claude: #d97706;
  --badge-tiktok: #00f2fe;

  /* Typography */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Container */
  --max-width: 1240px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 26px;
  --radius-full: 9999px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-main);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background: 
    radial-gradient(circle at 15% 15%, rgba(168, 85, 247, 0.12) 0%, transparent 40%),
    radial-gradient(circle at 85% 30%, rgba(6, 182, 212, 0.1) 0%, transparent 45%),
    radial-gradient(circle at 50% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 50%),
    var(--bg-dark);
  background-attachment: fixed;
}

/* Background grid overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

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

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button, input, select {
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   Top Announcement Bar
   ========================================================================== */
.announcement-bar {
  background: linear-gradient(90deg, rgba(168, 85, 247, 0.2), rgba(6, 182, 212, 0.2));
  border-bottom: 1px solid rgba(168, 85, 247, 0.3);
  font-size: 0.84rem;
  padding: 8px 16px;
  text-align: center;
  color: var(--text-white);
  position: relative;
  z-index: 101;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.announcement-bar .badge-fire {
  background: linear-gradient(135deg, #f43f5e, #ec4899);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}
.announcement-bar a {
  text-decoration: underline;
  color: var(--text-cyan);
  font-weight: 600;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(7, 9, 19, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  transition: all var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-white);
}

.brand-logo .logo-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.5);
  font-size: 1.2rem;
}

.brand-logo .logo-text span {
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-logo .logo-tag {
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(34, 211, 238, 0.15);
  color: var(--text-cyan);
  border: 1px solid rgba(34, 211, 238, 0.4);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  margin-left: 6px;
  vertical-align: middle;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-white);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-header-login {
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-highlight);
  background: rgba(255, 255, 255, 0.03);
  transition: all var(--transition-fast);
}

.btn-header-login:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--text-cyan);
  color: var(--text-white);
}

.btn-primary-glow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.92rem;
  padding: 9px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.45);
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
}

.btn-primary-glow:hover {
  box-shadow: 0 0 30px rgba(236, 72, 153, 0.6);
  transform: translateY(-1px);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  font-size: 1.2rem;
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
  padding: 70px 0 60px;
  position: relative;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid rgba(168, 85, 247, 0.35);
  color: var(--text-purple);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  box-shadow: 0 0 15px rgba(168, 85, 247, 0.2);
}

.hero-pill .pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22d3ee;
  box-shadow: 0 0 8px #22d3ee;
  animation: pulse-glow 2s infinite;
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
  color: var(--text-white);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 10%, #c084fc 50%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title .highlight-cyan {
  background: var(--gradient-cyan);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 820px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-painpoints {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 36px;
}

.painpoint-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: rgba(15, 18, 36, 0.8);
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.painpoint-tag.no-cross {
  color: #f87171;
  border-color: rgba(239, 68, 68, 0.3);
}

.painpoint-tag.yes-check {
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.3);
  background: rgba(16, 185, 129, 0.08);
  font-weight: 600;
}

.hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 34px;
  font-size: 1.08rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: 0 0 35px rgba(168, 85, 247, 0.5);
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-hero-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 50px rgba(236, 72, 153, 0.7);
}

.btn-hero-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 1.02rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: rgba(15, 18, 36, 0.9);
  border: 1px solid var(--border-highlight);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.btn-hero-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-cyan);
  color: var(--text-white);
}

/* Live Stats Bar */
.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto 50px;
  background: rgba(15, 18, 36, 0.7);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.stat-item {
  text-align: center;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text-white);
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}

.stat-value.cyan { color: var(--text-cyan); }
.stat-value.purple { color: var(--text-purple); }
.stat-value.green { color: var(--text-green); }
.stat-value.pink { color: var(--text-pink); }

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Streaming & AI Marquee */
.streaming-brands-marquee {
  overflow: hidden;
  position: relative;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  margin-bottom: 20px;
}

.marquee-track {
  display: flex;
  align-items: center;
  gap: 36px;
  width: max-content;
  animation: marquee-scroll 35s linear infinite;
}

.brand-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(15, 18, 36, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

.brand-chip .badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

/* ==========================================================================
   Section Title & Subtitles
   ========================================================================== */
.section-header {
  text-align: center;
  margin-bottom: 48px;
  position: relative;
}

.section-pretitle {
  color: var(--text-purple);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  color: var(--text-white);
  letter-spacing: -0.5px;
  margin-bottom: 14px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* ==========================================================================
   PRICING SECTION (Matches User Reference Image Faithfully)
   ========================================================================== */
.pricing-section {
  padding: 70px 0;
  position: relative;
}

.pricing-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.pricing-category-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(15, 18, 36, 0.9);
  padding: 5px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
}

.category-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.category-tab-btn.active {
  background: var(--gradient-cyan);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 0 14px rgba(6, 182, 212, 0.5);
}

.pricing-search-box {
  position: relative;
  width: 240px;
}

.pricing-search-box input {
  width: 100%;
  background: rgba(15, 18, 36, 0.8);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 8px 14px 8px 36px;
  font-size: 0.86rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.pricing-search-box input:focus {
  border-color: var(--text-purple);
}

.pricing-search-box .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* Exact Reference Card Styling */
.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
  backdrop-filter: blur(8px);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

/* Featured / Hot Card (Left card in user screenshot) */
.pricing-card.featured {
  border: 2px solid #a855f7;
  box-shadow: 0 0 35px rgba(168, 85, 247, 0.35), inset 0 0 15px rgba(168, 85, 247, 0.1);
  background: linear-gradient(180deg, rgba(26, 17, 48, 0.95) 0%, rgba(15, 18, 36, 0.95) 100%);
}

.pricing-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.plan-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.plan-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
}

.plan-icon.purple { background: rgba(168, 85, 247, 0.2); color: var(--text-purple); }
.plan-icon.cyan { background: rgba(6, 182, 212, 0.2); color: var(--text-cyan); }
.plan-icon.blue { background: rgba(59, 130, 246, 0.2); color: #60a5fa; }
.plan-icon.pink { background: rgba(244, 63, 94, 0.2); color: var(--text-pink); }

.plan-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-white);
}

.plan-tag-badge {
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.plan-tag-badge.hot {
  background: rgba(168, 85, 247, 0.25);
  color: #d8b4fe;
  border: 1px solid rgba(168, 85, 247, 0.5);
}

.plan-tag-badge.regular {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.plan-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  min-height: 22px;
}

/* Period Switcher in card */
.card-period-switcher {
  display: flex;
  align-items: center;
  gap: 5px;
  background: rgba(0, 0, 0, 0.35);
  padding: 3px 4px;
  border-radius: var(--radius-md);
  margin-bottom: 18px;
  border: 1px solid rgba(255, 255, 255, 0.04);
  width: fit-content;
  flex-wrap: wrap;
}

.period-chip {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.period-chip.active {
  background: var(--gradient-button);
  color: #fff;
  box-shadow: 0 0 10px rgba(139, 92, 246, 0.5);
}

.period-chip:hover:not(.active) {
  color: var(--text-primary);
}

/* Price Box */
.card-price-box {
  margin-bottom: 18px;
}

.price-currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-cyan);
}

.price-amount {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--text-cyan);
  font-family: var(--font-mono);
  letter-spacing: -1px;
}

.price-billing-cycle {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Spec Badges (Data, Devices, Speed) */
.plan-specs-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.spec-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.76rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.spec-chip.traffic {
  background: rgba(6, 182, 212, 0.12);
  color: #38bdf8;
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.spec-chip.devices {
  background: rgba(16, 185, 129, 0.12);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.spec-chip.speed {
  background: rgba(168, 85, 247, 0.12);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

/* Features List */
.plan-features-list {
  display: flex;
  flex-direction: column;
  gap: 11px;
  margin-bottom: 26px;
  flex-grow: 1;
}

.feature-bullet {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.feature-bullet::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 6px #10b981;
  margin-top: 6px;
  flex-shrink: 0;
}

/* Subscribe Button Row (Matches Screenshot: Gradient button + Round info button) */
.card-cta-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
}

.btn-card-subscribe {
  flex-grow: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--gradient-button);
  color: #fff;
  font-size: 0.92rem;
  font-weight: 700;
  padding: 11px 16px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.btn-card-subscribe:hover {
  background: var(--gradient-button-hover);
  box-shadow: 0 6px 22px rgba(139, 92, 246, 0.5);
}

.btn-card-info {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.btn-card-info:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--text-cyan);
  color: var(--text-white);
}

/* ==========================================================================
   LIVE NODE STATUS & HEALTH DASHBOARD
   ========================================================================== */
.node-status-section {
  padding: 70px 0;
  position: relative;
}

.node-dashboard-card {
  background: rgba(15, 18, 36, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 30px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

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

.node-region-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.region-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.region-btn.active, .region-btn:hover {
  background: rgba(168, 85, 247, 0.2);
  border-color: var(--text-purple);
  color: var(--text-white);
}

.btn-ping-test {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-cyan);
  border: none;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
  transition: all var(--transition-fast);
}

.btn-ping-test:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 25px rgba(6, 182, 212, 0.6);
}

.nodes-table-wrapper {
  overflow-x: auto;
}

.nodes-table {
  width: 100%;
  border-collapse: collapse;
}

.nodes-table th {
  text-align: left;
  padding: 12px 16px;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-subtle);
}

.nodes-table td {
  padding: 16px;
  font-size: 0.88rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.node-name-cell {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 1.3rem;
}

.node-title-wrap .title {
  font-weight: 700;
  color: var(--text-white);
}

.node-title-wrap .subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.latency-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.82rem;
}

.latency-badge.fast {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.latency-badge.medium {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.unlock-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.unlock-tag {
  font-size: 0.72rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
}

.unlock-tag.nf { background: rgba(229, 9, 20, 0.2); color: #f87171; }
.unlock-tag.ai { background: rgba(16, 163, 127, 0.2); color: #34d399; }
.unlock-tag.yt { background: rgba(255, 0, 0, 0.2); color: #fca5a5; }

/* ==========================================================================
   CORE TECHNICAL ADVANTAGES (6 Grid)
   ========================================================================== */
.features-section {
  padding: 70px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.feature-box::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.feature-box:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

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

.feature-icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(168, 85, 247, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--text-purple);
  margin-bottom: 20px;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.feature-box-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 10px;
}

.feature-box-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   TARGET AUDIENCE (适合人群)
   ========================================================================== */
.audience-section {
  padding: 70px 0;
}

.audience-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.audience-card {
  background: rgba(15, 18, 36, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--transition-normal);
}

.audience-card:hover {
  border-color: var(--text-cyan);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.15);
}

.audience-emoji {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.audience-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 8px;
}

.audience-desc {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ==========================================================================
   TUTORIALS SECTION (Clash / Clash Party / Multi-Platform)
   ========================================================================== */
.tutorials-section {
  padding: 70px 0;
}

.tutorials-container-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.tutorial-tabs-header {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(0, 0, 0, 0.2);
  overflow-x: auto;
}

.tutorial-tab-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 24px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.tutorial-tab-btn.active {
  color: var(--text-cyan);
  border-bottom-color: var(--text-cyan);
  background: rgba(6, 182, 212, 0.05);
}

.tutorial-content-pane {
  padding: 36px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
}

.tutorial-steps-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.tutorial-step-item {
  display: flex;
  gap: 16px;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-details h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 4px;
}

.step-details p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.tutorial-visual-preview {
  background: #090b16;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.6);
}

.code-snippet-box {
  background: #05070e;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #38bdf8;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
}

.btn-copy-code {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-white);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
}

/* ==========================================================================
   USER REVIEWS / TESTIMONIALS
   ========================================================================== */
.reviews-section {
  padding: 70px 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-card-hot);
  color: #fff;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.user-name {
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--text-white);
}

.user-badge {
  font-size: 0.74rem;
  color: var(--text-purple);
}

.review-stars {
  color: #fbbf24;
  font-size: 0.85rem;
  margin-bottom: 12px;
}

.review-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
}

/* ==========================================================================
   FAQ SECTION (Accordion)
   ========================================================================== */
.faq-section {
  padding: 70px 0;
}

.faq-search-wrapper {
  max-width: 580px;
  margin: 0 auto 36px;
  position: relative;
}

.faq-search-wrapper input {
  width: 100%;
  padding: 12px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  color: var(--text-white);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.faq-search-wrapper input:focus {
  border-color: var(--text-cyan);
}

.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.faq-item.active {
  border-color: var(--text-purple);
}

.faq-question {
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text-white);
  user-select: none;
}

.faq-toggle-icon {
  font-size: 1.2rem;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-toggle-icon {
  transform: rotate(45deg);
  color: var(--text-cyan);
}

.faq-answer {
  padding: 0 22px;
  max-height: 0;
  overflow: hidden;
  transition: all var(--transition-normal);
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding: 0 22px 20px;
  max-height: 600px;
}

/* ==========================================================================
   SEO ARTICLES & BLOG HUB (Articles Grid)
   ========================================================================== */
.articles-section {
  padding: 70px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--text-purple);
  box-shadow: 0 12px 30px rgba(168, 85, 247, 0.2);
}

.article-card-cover {
  height: 150px;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.2), rgba(6, 182, 212, 0.2));
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.8rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-card-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(15, 18, 36, 0.85);
  border: 1px solid var(--border-subtle);
  color: var(--text-cyan);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.article-card-body {
  padding: 22px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-white);
  line-height: 1.4;
  margin-bottom: 10px;
}

.article-card-title a:hover {
  color: var(--text-cyan);
}

.article-card-excerpt {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.article-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

.article-card-meta .read-more {
  color: var(--text-purple);
  font-weight: 600;
}

/* ==========================================================================
   FOOTER (Comprehensive Sitemap & Legal)
   ========================================================================== */
.site-footer {
  background: #04050a;
  border-top: 1px solid var(--border-subtle);
  padding: 70px 0 30px;
  font-size: 0.88rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 50px;
}

.footer-brand .brand-logo {
  margin-bottom: 14px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.86rem;
  line-height: 1.6;
  max-width: 320px;
  margin-bottom: 18px;
}

.footer-column h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-links-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links-list a {
  color: var(--text-secondary);
  font-size: 0.84rem;
  transition: color var(--transition-fast);
}

.footer-links-list a:hover {
  color: var(--text-cyan);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.8rem;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

/* ==========================================================================
   RESPONSIVE DESIGN (Mobile & Tablet)
   ========================================================================== */
@media (max-width: 1080px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .articles-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .hero-stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .audience-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .articles-grid, .reviews-grid {
    grid-template-columns: 1fr;
  }
  .tutorial-content-pane {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

/* Mobile Nav Drawer */
.mobile-nav-drawer {
  position: fixed;
  inset: 0;
  background: rgba(7, 9, 19, 0.95);
  backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  flex-direction: column;
  padding: 30px 24px;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-nav-drawer.open {
  transform: translateX(0);
}

.mobile-nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 36px;
}

.btn-close-drawer {
  background: none;
  border: none;
  color: var(--text-white);
  font-size: 1.8rem;
  cursor: pointer;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 20px;
  font-size: 1.15rem;
  font-weight: 600;
}