/* ==========================================================================
   花云 (HuaYun) - 奢华极简 网络加速器推广落地页 Design System & Global Styles
   Color Palette: Deep Obsidian (#08090C), Gold Accent (#D4AF37 / #E6C280),
   Cream (#F4F4F6), Muted Dark (#14161F), Border (#242836)
   ========================================================================== */

:root {
  --bg-main: #08090c;
  --bg-card: rgba(18, 20, 29, 0.75);
  --bg-card-hover: rgba(28, 31, 45, 0.85);
  --bg-glass: rgba(15, 17, 24, 0.65);
  --bg-input: #10121a;
  
  --color-primary: #e6c280;
  --color-primary-glow: rgba(230, 194, 128, 0.25);
  --color-gold-gradient: linear-gradient(135deg, #f3d79b 0%, #c99e51 100%);
  --color-text-main: #f4f5f8;
  --color-text-muted: #9499ad;
  --color-text-sub: #c0c5d6;
  --color-border: rgba(230, 194, 128, 0.15);
  --color-border-hover: rgba(230, 194, 128, 0.4);
  
  --font-brand: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Arial Rounded MT Bold", -apple-system, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Playfair Display", Georgia, "Times New Roman", serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-glow: 0 0 35px rgba(230, 194, 128, 0.12);
  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.4);

  --header-height: 80px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-main);
  color: var(--color-text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  position: relative;
  background: radial-gradient(circle at 50% 0%, #161824 0%, #08090c 70%);
  min-height: 100vh;
}

/* Typography Utility */
.font-brand {
  font-family: var(--font-brand);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.font-serif {
  font-family: var(--font-serif);
}

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

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

a:hover {
  color: #fff;
}

/* Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header Navbar */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.logo-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--color-gold-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  font-weight: 900;
  color: #08090c;
  box-shadow: 0 0 15px var(--color-primary-glow);
}

.logo-text {
  font-family: var(--font-brand);
  font-size: 24px;
  font-weight: 800;
  color: var(--color-text-main);
  letter-spacing: 1px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-link {
  color: var(--color-text-sub);
  font-size: 15px;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-link:hover {
  color: var(--color-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-gold-gradient);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-full);
  background: var(--color-gold-gradient);
  color: #08090c;
  font-size: 15px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(230, 194, 128, 0.35);
  color: #000;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 26px;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-text-main);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid var(--color-border-hover);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background: rgba(230, 194, 128, 0.08);
}

/* Mobile Menu Button */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-main);
  font-size: 24px;
  cursor: pointer;
}

/* Section Styling */
.section {
  padding: 110px 0;
  position: relative;
}

.section-title-wrap {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding: 4px 14px;
  border-radius: var(--radius-full);
  background: rgba(230, 194, 128, 0.08);
  border: 1px solid var(--color-border);
}

.section-title {
  font-family: var(--font-brand);
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Hero Section */
.hero-section {
  padding-top: calc(var(--header-height) + 70px);
  padding-bottom: 100px;
  min-height: 85vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.hero-content h1 {
  font-family: var(--font-brand);
  font-size: 52px;
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-sub);
  margin-bottom: 36px;
  line-height: 1.7;
  max-width: 540px;
}

.hero-cta-group {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 36px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
}

.stat-item .stat-num {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
  font-family: var(--font-brand);
}

.stat-item .stat-label {
  font-size: 13px;
  color: var(--color-text-muted);
}

/* Dynamic Hero Showcase Cards Stack */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), border-color var(--transition-fast);
}

.glass-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-4px);
}

.hero-card-main {
  width: 100%;
  max-width: 480px;
  position: relative;
  z-index: 2;
}

.card-header-badge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.pulse-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.speed-meter {
  text-align: center;
  padding: 24px 0;
  border-y: 1px solid var(--color-border);
}

.speed-val {
  font-size: 48px;
  font-weight: 900;
  font-family: var(--font-brand);
  background: var(--color-gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.node-list-mini {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 20px;
}

.mini-node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.node-ping {
  color: #10b981;
  font-weight: 600;
  font-size: 13px;
}

/* Features Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: rgba(230, 194, 128, 0.1);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  color: var(--color-primary);
}

.feature-title {
  font-family: var(--font-brand);
  font-size: 20px;
  font-weight: 700;
}

.feature-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Streaming & AI Section */
.service-support-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.support-card {
  text-align: center;
  padding: 28px 20px;
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast);
}

.support-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
}

.support-icon {
  font-size: 36px;
  margin-bottom: 12px;
  display: block;
}

.support-name {
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 6px;
}

.support-tag {
  font-size: 12px;
  color: var(--color-text-muted);
}

.disclaimer-box {
  margin-top: 36px;
  text-align: center;
  font-size: 13px;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.02);
  padding: 14px 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  display: inline-block;
  margin-left: auto;
  margin-right: auto;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.price-card.popular {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, rgba(230, 194, 128, 0.12) 0%, rgba(18, 20, 29, 0.85) 100%);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-gold-gradient);
  color: #08090c;
  font-size: 12px;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 1px;
}

.plan-name {
  font-family: var(--font-brand);
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 12px;
}

.plan-price {
  font-family: var(--font-brand);
  font-size: 38px;
  font-weight: 900;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.plan-price span {
  font-size: 14px;
  color: var(--color-text-muted);
  font-weight: 400;
}

.plan-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 30px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 14px;
  color: var(--color-text-sub);
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features li::before {
  content: '✓';
  color: var(--color-primary);
  font-weight: bold;
}

.price-card .btn-primary, .price-card .btn-outline {
  width: 100%;
  text-align: center;
}

/* FAQ Accordion Section */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

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

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--color-text-main);
  font-size: 17px;
  font-weight: 700;
  font-family: var(--font-brand);
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-icon {
  font-size: 20px;
  color: var(--color-primary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  padding: 0 24px 22px 24px;
  max-height: 300px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Section Floating Nav Arrows (Right Side) */
.section-nav-float {
  position: fixed;
  right: 28px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 990;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.nav-arrow-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
  transition: all var(--transition-fast);
}

.nav-arrow-btn:hover:not(:disabled) {
  background: var(--color-primary);
  color: #08090c;
  border-color: var(--color-primary);
  transform: scale(1.08);
}

.nav-arrow-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
  border-color: transparent;
}

/* Footer Section */
.site-footer {
  background: #040507;
  border-top: 1px solid var(--color-border);
  padding: 60px 0 40px 0;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  text-align: center;
}

.footer-nav {
  display: flex;
  gap: 32px;
  list-style: none;
}

.footer-nav a {
  color: var(--color-text-sub);
  font-size: 15px;
  font-weight: 500;
}

.footer-nav a:hover {
  color: var(--color-primary);
}

.copyright {
  font-size: 14px;
  color: var(--color-text-muted);
}

/* Sub-Pages Header / Article Layout Styles */
.page-header {
  padding-top: calc(var(--header-height) + 40px);
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 50px;
  background: radial-gradient(circle at 50% 0%, rgba(230, 194, 128, 0.05) 0%, transparent 70%);
}

.article-content {
  max-width: 860px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text-sub);
}

.article-content h1 {
  font-family: var(--font-brand);
  font-size: 36px;
  color: var(--color-text-main);
  margin-bottom: 20px;
}

.article-content h2 {
  font-family: var(--font-brand);
  font-size: 26px;
  color: var(--color-text-main);
  margin: 36px 0 16px 0;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 8px;
}

.article-content h3 {
  font-family: var(--font-brand);
  font-size: 20px;
  color: var(--color-primary);
  margin: 24px 0 12px 0;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul, .article-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content code {
  background: rgba(230, 194, 128, 0.1);
  color: var(--color-primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 14px;
}

.article-content pre {
  background: #0d0f17;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  overflow-x: auto;
  margin-bottom: 24px;
}

.article-content pre code {
  background: none;
  padding: 0;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 30px;
}

.cta-box-in-article {
  background: var(--bg-card);
  border: 1px solid var(--color-border-hover);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  margin: 40px 0;
}

.cta-box-in-article h3 {
  font-size: 22px;
  color: var(--color-text-main);
  margin-bottom: 12px;
}

.cta-box-in-article p {
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

/* Article Grid for KB Index */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

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

.article-card-title {
  font-family: var(--font-brand);
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.4;
  color: var(--color-text-main);
}

.article-card-desc {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  flex-grow: 1;
  line-height: 1.6;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--color-text-muted);
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

/* Reduced Motion Respect */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Responsive Breakdown */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .price-card.popular {
    transform: none;
  }
  .service-support-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 70px;
  }
  .hero-content h1 {
    font-size: 34px;
  }
  .section-title {
    font-size: 28px;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #08090c;
    flex-direction: column;
    padding: 20px 0;
    gap: 20px;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-menu.active {
    display: flex;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .header-cta {
    display: none;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .service-support-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .section-nav-float {
    right: 12px;
  }
  .nav-arrow-btn {
    width: 38px;
    height: 38px;
    font-size: 15px;
  }
}