/* ==========================================================================
   shanshuiyun (山水云) - 2026 旗舰级超低延迟全球专线网络加速器官网
   Cyber Shan-Shui 东方极速云谷美学设计 · 纯原生现代 CSS · 极致性能与响应式体验
   ========================================================================== */

:root {
  --bg-primary: #050b14;
  --bg-secondary: #091322;
  --bg-card: rgba(11, 23, 42, 0.78);
  --bg-card-hover: rgba(16, 32, 58, 0.92);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(6, 182, 212, 0.6);
  
  --primary: #10b981;
  --primary-hover: #059669;
  --primary-glow: rgba(16, 185, 129, 0.4);
  --accent: #06b6d4;
  --accent-alt: #14b8a6;
  --accent-gold: #f59e0b;
  --gradient-main: linear-gradient(135deg, #10b981 0%, #06b6d4 50%, #3b82f6 100%);
  --gradient-card: linear-gradient(145deg, rgba(16, 185, 129, 0.12) 0%, rgba(6, 182, 212, 0.04) 100%);
  --gradient-fast: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
  --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #10b981 100%);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --success: #10b981;
  --warning: #f59e0b;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "Fira Code", Consolas, Monaco, "Courier New", monospace;
  
  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #0c2738 0%, var(--bg-primary) 70%);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

img, svg {
  vertical-align: middle;
}

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

/* Background Atmosphere */
.bg-glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
}

.glow-1 {
  width: 550px;
  height: 550px;
  background: rgba(16, 185, 129, 0.22);
  top: 5%;
  left: 50%;
  transform: translateX(-50%);
}

.glow-2 {
  width: 480px;
  height: 480px;
  background: rgba(6, 182, 212, 0.18);
  top: 35%;
  left: 75%;
}

.glow-3 {
  width: 500px;
  height: 500px;
  background: rgba(59, 130, 246, 0.15);
  top: 65%;
  left: 20%;
}

/* Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 11, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-main);
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 24px var(--primary-glow);
}

.brand-icon svg {
  width: 26px;
  height: 26px;
  fill: #fff;
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover {
  color: #fff;
}

.nav-link.highlight-tag {
  color: #38bdf8;
  font-weight: 600;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  padding: 10px 22px;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
  color: #fff;
}

.btn-primary {
  background: var(--gradient-main);
  color: #fff;
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(16, 185, 129, 0.6);
}

.btn-lg {
  padding: 15px 34px;
  font-size: 1.1rem;
  border-radius: var(--radius-lg);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(6, 182, 212, 0.5);
}

.btn-outline:hover {
  background: rgba(6, 182, 212, 0.12);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 88px 0 64px;
  text-align: center;
  z-index: 1;
}

.hero-promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: #34d399;
  margin-bottom: 28px;
}

.hero-promo-badge .promo-highlight {
  color: #fbbf24;
}

.hero-title {
  font-size: 3.6rem;
  font-weight: 850;
  line-height: 1.18;
  letter-spacing: -1.2px;
  max-width: 980px;
  margin: 0 auto 24px;
}

.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.hero-features-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  color: var(--text-muted);
  font-size: 0.92rem;
  flex-wrap: wrap;
}

.strip-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.strip-item .check-icon {
  color: var(--success);
  font-weight: bold;
}

/* Metrics & Speedtest Section */
.metrics-section {
  padding: 40px 0 70px;
  position: relative;
  z-index: 1;
}

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

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
}

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

.metric-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.metric-label {
  font-size: 0.92rem;
  color: var(--text-muted);
}

/* Section Header Shared */
.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: #fff;
}

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

/* Features Grid */
.features-section {
  padding: 70px 0;
  position: relative;
  z-index: 1;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 34px 28px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-main);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-5px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45);
}

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

.feature-icon-wrapper {
  width: 54px;
  height: 54px;
  border-radius: var(--radius-md);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 22px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

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

/* Nodes Table & Speed Showcase */
.nodes-section {
  padding: 70px 0;
  position: relative;
  z-index: 1;
}

.nodes-table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  backdrop-filter: blur(12px);
}

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

.nodes-table th, .nodes-table td {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
}

.nodes-table th {
  background: rgba(255, 255, 255, 0.02);
  font-size: 0.88rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.nodes-table tr:last-child td {
  border-bottom: none;
}

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

.node-region {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  color: #fff;
}

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

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}

.status-live {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 6px currentColor;
}

.ping-tag {
  font-family: var(--font-mono);
  font-weight: 700;
  color: #38bdf8;
}

/* Streaming & AI Unlock Section */
.streaming-section {
  padding: 70px 0;
  position: relative;
  z-index: 1;
}

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

.streaming-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
}

.streaming-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-4px);
}

.service-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}

.service-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.service-tag {
  font-size: 0.82rem;
  color: #34d399;
  font-weight: 600;
}

/* Pricing Section */
.pricing-section {
  padding: 80px 0;
  position: relative;
  z-index: 1;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  position: relative;
  backdrop-filter: blur(14px);
}

.pricing-card.featured {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.14) 0%, rgba(11, 23, 42, 0.95) 100%);
  transform: scale(1.04);
  box-shadow: 0 16px 40px rgba(16, 185, 129, 0.25);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-main);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px var(--primary-glow);
}

.pricing-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

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

.plan-price-box {
  margin-bottom: 28px;
}

.plan-currency {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
}

.plan-price {
  font-size: 3.2rem;
  font-weight: 850;
  color: #fff;
  font-family: var(--font-mono);
}

.plan-period {
  font-size: 0.92rem;
  color: var(--text-dim);
}

.plan-features {
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.94rem;
  color: var(--text-main);
  margin-bottom: 14px;
}

.plan-feature-item .icon {
  color: var(--success);
  font-weight: bold;
}

/* FAQ Accordion Section */
.faq-section {
  padding: 70px 0;
  position: relative;
  z-index: 1;
}

.faq-container {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item:hover {
  border-color: rgba(6, 182, 212, 0.4);
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  gap: 16px;
}

.faq-question .arrow {
  transition: transform var(--transition-fast);
  font-size: 0.85rem;
  color: var(--accent);
}

.faq-item.active .faq-question .arrow {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
  padding: 0 26px;
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 24px;
}

/* Articles SEO Section */
.articles-preview-section {
  padding: 70px 0 90px;
  position: relative;
  z-index: 1;
}

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

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  backdrop-filter: blur(12px);
}

.article-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-4px);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.84rem;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.article-tag {
  color: var(--accent);
  font-weight: 600;
}

.article-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-link {
  color: #38bdf8;
  font-size: 0.92rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition-fast);
}

.article-link:hover {
  gap: 10px;
  color: #7dd3fc;
}

/* Final Conversion Banner (CTA Banner) */
.cta-banner-section {
  padding: 70px 0 100px;
  position: relative;
  z-index: 1;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.22) 0%, rgba(6, 182, 212, 0.18) 50%, rgba(59, 130, 246, 0.15) 100%);
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: 28px;
  padding: 60px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
}

.cta-title {
  font-size: 2.6rem;
  font-weight: 850;
  margin-bottom: 18px;
  color: #fff;
}

.cta-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 650px;
  margin: 0 auto 36px;
  line-height: 1.65;
}

/* Footer */
.footer {
  background: #02060c;
  border-top: 1px solid var(--border-color);
  padding: 70px 0 36px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 20px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-link {
  font-size: 0.92rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  .features-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin: 0 auto;
  }
  .pricing-card.featured {
    transform: none;
  }
  .streaming-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(5, 11, 20, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-menu.active {
    display: flex;
  }
  .menu-toggle {
    display: flex;
  }
  .hero-title {
    font-size: 2.2rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .features-grid, .articles-grid, .metrics-grid, .streaming-grid {
    grid-template-columns: 1fr;
  }
  .cta-title {
    font-size: 2rem;
  }
  .cta-banner-box {
    padding: 40px 24px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 14px;
    text-align: center;
  }
}