/* 
 * 赔钱机场 (peiqianjchang.lol) - Modern Metallic Silver-Grey Styling Framework
 * Designed for High Performance, GEO/SEO Optimization, and Premium Silver Visuals
 */

:root {
  /* Silver Grey Palette */
  --bg-dark: #0b0d10;
  --bg-card: rgba(22, 26, 33, 0.75);
  --bg-card-hover: rgba(30, 36, 46, 0.9);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --border-silver: rgba(255, 255, 255, 0.12);
  --border-silver-glow: rgba(200, 215, 235, 0.3);
  
  /* Text Colors */
  --text-main: #f0f4f8;
  --text-muted: #94a3b8;
  --text-silver: #cbd5e1;
  --text-bright: #ffffff;

  /* Accent Metallic Colors */
  --accent-silver: #e2e8f0;
  --accent-metallic: linear-gradient(135deg, #94a3b8 0%, #e2e8f0 50%, #64748b 100%);
  --accent-glow: linear-gradient(135deg, #38bdf8 0%, #818cf8 50%, #c084fc 100%);
  --accent-gold-subsidy: #fbbf24;
  --accent-green-online: #10b981;
  --accent-primary: #38bdf8;
  --accent-primary-hover: #0284c7;

  /* Fonts & Radius */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  --shadow-metallic: 0 10px 30px -10px rgba(0, 0, 0, 0.8), 0 0 20px rgba(226, 232, 240, 0.05);
  --shadow-glow: 0 0 35px rgba(56, 189, 248, 0.25);
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(148, 163, 184, 0.08) 0%, transparent 45%),
    radial-gradient(circle at 85% 60%, rgba(56, 189, 248, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 90%, rgba(129, 140, 248, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
}

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

a:hover {
  color: #7dd3fc;
}

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

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
  position: relative;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 0.75rem;
  background: var(--accent-metallic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -0.02em;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto 3.5rem auto;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.85rem 1.8rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(56, 189, 248, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.5);
  color: #ffffff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--accent-silver);
  border: 1px solid var(--border-silver);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.3);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1.1rem 2.4rem;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn-block {
  width: 100%;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.825rem;
  font-weight: 600;
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-primary);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.badge-gold {
  background: rgba(251, 191, 36, 0.12);
  color: var(--accent-gold-subsidy);
  border-color: rgba(251, 191, 36, 0.3);
}

/* Header & Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 0;
  transition: var(--transition);
}

.header.scrolled {
  background: rgba(11, 13, 16, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-silver);
  padding: 0.75rem 0;
}

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

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

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #e2e8f0 0%, #38bdf8 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0b0d10;
  font-weight: 900;
  font-size: 1.2rem;
  box-shadow: 0 0 15px rgba(226, 232, 240, 0.3);
}

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

.nav-links a {
  color: var(--text-silver);
  font-size: 0.95rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: #ffffff;
}

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

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  padding-top: 9rem;
  padding-bottom: 6rem;
  text-align: center;
  position: relative;
}

.hero-badge {
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  color: #ffffff;
}

.hero-title span.highlight {
  background: linear-gradient(135deg, #ffffff 0%, #94a3b8 50%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 2.5rem auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-silver);
  padding: 1.5rem 1rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(12px);
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--border-silver-glow);
  transform: translateY(-3px);
  box-shadow: var(--shadow-metallic);
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.stat-value.glow {
  color: #38bdf8;
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Feature Cards & Grid */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-silver);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  backdrop-filter: blur(14px);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(226, 232, 240, 0.4), transparent);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(226, 232, 240, 0.3);
  box-shadow: var(--shadow-metallic);
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-silver);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  color: var(--accent-primary);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

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

/* Global Health Latency Monitor Panel */
.monitor-card {
  background: rgba(15, 20, 28, 0.85);
  border: 1px solid var(--border-silver);
  border-radius: var(--radius-xl);
  padding: 2rem;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-metallic);
}

.monitor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-silver);
}

.monitor-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.online-dot {
  width: 10px;
  height: 10px;
  background-color: var(--accent-green-online);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-green-online);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

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

.node-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.node-table td {
  padding: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  font-size: 0.95rem;
}

.node-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.ping-badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.825rem;
  font-family: monospace;
}

.ping-low { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.ping-mid { background: rgba(56, 189, 248, 0.15); color: #38bdf8; }

/* Pricing Section */
.pricing-toggle-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}

.toggle-switch {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 9999px;
  padding: 4px;
  display: flex;
  border: 1px solid var(--border-silver);
}

.toggle-btn {
  padding: 0.5rem 1.4rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  background: transparent;
  color: var(--text-muted);
  border: none;
  transition: var(--transition);
}

.toggle-btn.active {
  background: linear-gradient(135deg, #e2e8f0 0%, #94a3b8 100%);
  color: #0b0d10;
  box-shadow: 0 2px 10px rgba(255, 255, 255, 0.2);
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-silver);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  backdrop-filter: blur(16px);
  transition: var(--transition);
}

.pricing-card.popular {
  border-color: rgba(56, 189, 248, 0.6);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.2);
}

.pricing-card.popular::before {
  content: '⚡ 赔钱重磅补贴';
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  color: #ffffff;
  padding: 0.35rem 1.25rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.4);
}

.pricing-header {
  margin-bottom: 1.5rem;
  text-align: center;
}

.pricing-name {
  font-size: 1.5rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.pricing-price {
  font-size: 2.75rem;
  font-weight: 900;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.pricing-price span.unit {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  margin: 1.5rem 0 2rem 0;
  flex-grow: 1;
}

.pricing-features li {
  padding: 0.6rem 0;
  font-size: 0.95rem;
  color: var(--text-silver);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.pricing-features li i {
  color: #38bdf8;
}

/* Tutorials & Audience */
.tutorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-silver);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  transition: var(--transition);
}

.tutorial-card:hover {
  transform: translateY(-3px);
  border-color: rgba(226, 232, 240, 0.3);
}

.tutorial-icon-box {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(56, 189, 248, 0.1);
  color: #38bdf8;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

/* FAQ Accordion */
.faq-grid {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

.faq-question {
  padding: 1.25rem 1.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: #ffffff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-answer {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-question {
  color: #38bdf8;
}

/* Article Grid & Cards */
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-silver);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: rgba(226, 232, 240, 0.3);
  box-shadow: var(--shadow-metallic);
}

.article-meta {
  font-size: 0.825rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  gap: 1rem;
}

.article-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: #38bdf8;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

/* CTA Highlight Box */
.cta-box {
  background: linear-gradient(135deg, rgba(22, 26, 33, 0.95) 0%, rgba(30, 41, 59, 0.95) 100%);
  border: 1px solid var(--border-silver-glow);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

/* Footer */
.footer {
  background: #07080a;
  border-top: 1px solid var(--border-silver);
  padding: 4rem 0 2rem 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  margin-top: 1rem;
  color: var(--text-muted);
  max-width: 340px;
}

.footer-column h4 {
  color: #ffffff;
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
  font-weight: 700;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  color: var(--text-silver);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: #38bdf8;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

/* Article Detail Page Layout */
.article-page {
  padding-top: 8rem;
  padding-bottom: 5rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.breadcrumb a {
  color: var(--text-silver);
}

.article-header {
  margin-bottom: 2.5rem;
}

.article-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.article-content {
  background: var(--bg-card);
  border: 1px solid var(--border-silver);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  margin-bottom: 3rem;
  backdrop-filter: blur(16px);
}

.article-content h2 {
  font-size: 1.75rem;
  color: #ffffff;
  margin: 2rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-silver);
}

.article-content h3 {
  font-size: 1.3rem;
  color: #e2e8f0;
  margin: 1.5rem 0 0.75rem 0;
}

.article-content p {
  margin-bottom: 1.25rem;
  color: var(--text-silver);
  line-height: 1.8;
}

.article-content ul, .article-content ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: var(--text-silver);
}

.article-content li {
  margin-bottom: 0.5rem;
  line-height: 1.7;
}

.article-content code {
  background: rgba(255, 255, 255, 0.08);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: monospace;
  color: #38bdf8;
  font-size: 0.9em;
}

.article-content pre {
  background: #0f141c;
  padding: 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-silver);
  overflow-x: auto;
  margin: 1.25rem 0;
}

.article-content pre code {
  background: transparent;
  padding: 0;
  color: var(--text-silver);
}

/* Standout Internal/External Banner Box inside Articles */
.prominent-cta-banner {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(37, 99, 235, 0.15) 100%);
  border: 1px dashed rgba(56, 189, 248, 0.5);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.prominent-cta-text {
  font-weight: 700;
  font-size: 1.1rem;
  color: #ffffff;
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-title { font-size: 2.75rem; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  .hero-title { font-size: 2.1rem; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .node-table th:nth-child(3), .node-table td:nth-child(3) { display: none; }
  .article-content { padding: 1.5rem; }
}