/* ==========================================================================
   西部数据 (Western Data) - 极简西部风 (Minimalist Western Tech) Design System
   ========================================================================== */

:root {
  --color-bg-main: #0c0e12;
  --color-bg-card: rgba(22, 26, 34, 0.75);
  --color-bg-card-hover: rgba(30, 36, 48, 0.85);
  --color-bg-glass: rgba(18, 21, 28, 0.65);
  
  --color-primary: #e29d52; /* 暖沙金 / Desert Gold */
  --color-primary-hover: #f5b064;
  --color-primary-light: rgba(226, 157, 82, 0.12);
  --color-primary-border: rgba(226, 157, 82, 0.3);
  
  --color-secondary: #d95d39; /* 陶土赭 / Terracotta Red */
  --color-secondary-hover: #ea6d49;
  
  --color-text-bright: #ffffff;
  --color-text-main: #f0f2f5;
  --color-text-muted: #9a9ea7;
  --color-text-dim: #646a78;
  
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(226, 157, 82, 0.4);

  --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-family-title: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 25px rgba(226, 157, 82, 0.25);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 50% 0%, #1a1612 0%, #0c0e12 70%);
}

/* Reduced motion */
@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;
    scroll-behavior: auto !important;
  }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-title);
  color: var(--color-text-bright);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  text-align: center;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
}

p {
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.7;
}

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

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

.text-gradient {
  background: linear-gradient(135deg, #ffffff 30%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gold {
  color: var(--color-primary);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

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

.section-header {
  max-width: 720px;
  margin: 0 auto 3.5rem auto;
  text-align: center;
}

.section-header .subtitle {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  padding: 0.35rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 1rem;
}

/* Header & Nav */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(12, 14, 18, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 900;
  color: var(--color-text-bright);
  text-decoration: none;
}

.logo-icon {
  width: 2.2rem;
  height: 2.2rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  box-shadow: 0 2px 10px rgba(226, 157, 82, 0.4);
}

.logo-text {
  font-family: var(--font-family-title);
  letter-spacing: -0.03em;
}

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

.nav-link {
  color: var(--color-text-main);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast);
}

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

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

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

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

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-text-bright);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), #c98238);
  color: #0c0e12;
  box-shadow: 0 4px 18px rgba(226, 157, 82, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #f0aa5c, var(--color-primary));
  color: #000;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(226, 157, 82, 0.5);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text-bright);
  border-color: var(--color-border);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--color-primary-border);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 1.1rem 2.2rem;
  font-size: 1.1rem;
  border-radius: var(--radius-md);
}

/* Hero Section */
.hero-section {
  padding-top: 9rem;
  padding-bottom: 6rem;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(226, 157, 82, 0.1);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-full);
  color: var(--color-primary);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
}

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

.hero-desc {
  font-size: 1.15rem;
  margin-bottom: 2.25rem;
  max-width: 540px;
}

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

.hero-metrics {
  display: flex;
  gap: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-value {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--color-text-bright);
}

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

/* Hero Visual & Dynamic Cards */
.hero-visual {
  position: relative;
}

.hero-card-stack {
  position: relative;
  width: 100%;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.dynamic-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
}

.dynamic-card:hover {
  border-color: var(--color-primary-border);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.card-header-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-primary);
}

.speed-meter {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.speed-number {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-primary);
  font-family: monospace;
}

.node-list-mini {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}

.ping-tag {
  color: #10b981;
  font-weight: 700;
  font-size: 0.8rem;
}

/* Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.feature-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.feature-card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-primary-border);
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 3.2rem;
  height: 3.2rem;
  border-radius: var(--radius-md);
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.feature-icon svg {
  width: 1.75rem;
  height: 1.75rem;
  fill: currentColor;
}

/* Streaming & AI Support */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  text-align: center;
  transition: all var(--transition-normal);
}

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

.service-badge-icon {
  width: 3.5rem;
  height: 3.5rem;
  margin: 0 auto 1.25rem auto;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
}

.service-badge-icon svg {
  width: 2rem;
  height: 2rem;
}

.service-status {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.75rem;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  font-weight: 600;
}

/* Pricing Section */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1.75rem;
}

.pricing-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-primary-border);
}

.pricing-card.popular {
  border: 2px solid var(--color-primary);
  background: linear-gradient(180deg, rgba(226, 157, 82, 0.08) 0%, rgba(22, 26, 34, 0.85) 100%);
  box-shadow: var(--shadow-glow);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 1.5rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #000;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.25rem 0.85rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.pricing-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
}

.pricing-price {
  margin: 1rem 0 0.5rem 0;
  display: flex;
  align-items: baseline;
}

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

.pricing-price .amount {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--color-text-bright);
}

.pricing-price .period {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-left: 0.3rem;
}

.pricing-features {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.925rem;
  color: var(--color-text-main);
}

.pricing-features li svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: var(--color-primary);
  flex-shrink: 0;
}

/* FAQ Section */
.faq-grid {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

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

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

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--color-text-bright);
  font-weight: 700;
  font-size: 1.05rem;
  text-align: left;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-question svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: var(--color-text-muted);
  transition: transform var(--transition-normal);
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
  fill: var(--color-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
  padding: 0 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding: 0 1.5rem 1.5rem 1.5rem;
}

/* Right Side Chapter Navigation Arrows */
.chapter-nav {
  position: fixed;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background: rgba(18, 21, 28, 0.8);
  backdrop-filter: blur(12px);
  padding: 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
}

.chapter-btn {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  color: var(--color-text-bright);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chapter-btn:hover:not(:disabled) {
  background: var(--color-primary);
  color: #000;
  border-color: var(--color-primary);
  transform: scale(1.1);
}

.chapter-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.chapter-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

/* Footer */
.site-footer {
  background: #080a0d;
  border-top: 1px solid var(--color-border);
  padding: 4rem 0 2rem 0;
  margin-top: auto;
}

.footer-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-nav {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  color: var(--color-text-muted);
  font-weight: 500;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--color-text-dim);
  font-size: 0.85rem;
}

/* Knowledge Base Article Styles */
.article-page-header {
  padding-top: 8rem;
  padding-bottom: 3rem;
  background: radial-gradient(circle at 50% 0%, rgba(226, 157, 82, 0.15) 0%, transparent 70%);
  text-align: center;
}

.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.article-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  margin-bottom: 4rem;
}

.article-content h1 {
  font-size: 2.2rem;
  margin-bottom: 1.25rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.article-body h2 {
  text-align: left;
  font-size: 1.6rem;
  margin: 2.25rem 0 1rem 0;
  color: var(--color-primary);
}

.article-body h3 {
  font-size: 1.25rem;
  margin: 1.75rem 0 0.75rem 0;
  color: var(--color-text-bright);
}

.article-body p {
  margin-bottom: 1.25rem;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--color-text-main);
}

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

.article-body li {
  margin-bottom: 0.5rem;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(226, 157, 82, 0.15), rgba(217, 93, 57, 0.15));
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  text-align: center;
  margin: 3rem 0;
}

.article-cta-box h3 {
  margin-bottom: 0.75rem;
}

/* Articles List Grid */
.articles-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.article-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

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

.article-card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.2rem;
}

.article-card p {
  font-size: 0.925rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-desc {
    max-width: 100%;
  }

  .chapter-nav {
    right: 0.75rem;
    padding: 0.35rem;
  }

  .chapter-btn {
    width: 2.25rem;
    height: 2.25rem;
  }
}

@media (max-width: 768px) {
  .mobile-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 4.5rem;
    left: 0;
    right: 0;
    background: rgba(12, 14, 18, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 2rem;
    gap: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-150%);
    transition: transform var(--transition-normal);
  }

  .nav-menu.active {
    transform: translateY(0);
  }

  .hero-metrics {
    gap: 1.5rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .article-content {
    padding: 1.75rem 1.25rem;
  }

  .chapter-nav {
    top: auto;
    bottom: 1.5rem;
    transform: none;
    flex-direction: row;
    right: 1.5rem;
  }
}