/* ==========================================================================
   shanshuiyun (山水云) - 2026 旗舰级超低延迟全球专线网络加速器官网
   Black & Gold Luxury VIP Edition · 黑金奢华尊贵风 · 极致性能与响应式设计
   ========================================================================== */

:root {
  --bg-primary: #08090b;
  --bg-secondary: #101216;
  --bg-card: rgba(18, 20, 26, 0.82);
  --bg-card-hover: rgba(26, 29, 38, 0.95);
  --border-color: rgba(212, 175, 55, 0.18);
  --border-focus: rgba(245, 158, 11, 0.7);
  
  --primary: #f59e0b;
  --primary-hover: #d97706;
  --primary-glow: rgba(245, 158, 11, 0.45);
  --accent: #fbbf24;
  --accent-alt: #fde047;
  --accent-gold: #d4af37;
  --gradient-main: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
  --gradient-card: linear-gradient(145deg, rgba(245, 158, 11, 0.12) 0%, rgba(212, 175, 55, 0.03) 100%);
  --gradient-fast: linear-gradient(135deg, #fde047 0%, #d97706 100%);
  --gradient-warm: linear-gradient(135deg, #f59e0b 0%, #ca8a04 100%);
  
  --text-main: #f8fafc;
  --text-muted: #a1a1aa;
  --text-dim: #71717a;
  
  --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%, #261d0a 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(245, 158, 11, 0.22);
  top: 5%;
  left: 50%;
  transform: translateX(-50%);
}

.glow-2 {
  width: 480px;
  height: 480px;
  background: rgba(212, 175, 55, 0.16);
  top: 35%;
  left: 75%;
}

.glow-3 {
  width: 500px;
  height: 500px;
  background: rgba(180, 83, 9, 0.12);
  top: 65%;
  left: 20%;
}

/* Navigation Bar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8, 9, 11, 0.88);
  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, .nav-link.active {
  color: #fbbf24;
}

.nav-link.highlight-tag {
  color: #fbbf24;
  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-primary {
  background: var(--gradient-main);
  color: #0c0a09;
  font-weight: 700;
  box-shadow: 0 4px 22px var(--primary-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(251, 191, 36, 0.65);
}

.btn-outline {
  background: transparent;
  color: #fbbf24;
  border-color: rgba(245, 158, 11, 0.5);
}

.btn-outline:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: #fbbf24;
  color: #fff;
  transform: translateY(-2px);
}

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

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: #fbbf24;
  border-radius: 2px;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: 96px 0 72px;
  text-align: center;
  z-index: 1;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.35);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: #fbbf24;
  margin-bottom: 28px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: #fbbf24;
  border-radius: 50%;
  box-shadow: 0 0 10px #fbbf24;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 850;
  line-height: 1.2;
  letter-spacing: -1.2px;
  max-width: 980px;
  margin: 0 auto 24px;
}

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

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 40px;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.stat-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 16px;
  backdrop-filter: blur(12px);
  transition: transform var(--transition-normal);
}

.stat-item:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.45);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fbbf24;
  margin-bottom: 6px;
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.88rem;
  color: var(--text-muted);
}

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

.section-tag {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: #fbbf24;
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

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

/* Speed Section */
.speed-section {
  padding: 60px 0 80px;
  position: relative;
  z-index: 1;
}

.speed-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.speed-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.speed-card.highlight-card {
  border-color: rgba(245, 158, 11, 0.45);
  box-shadow: 0 10px 40px rgba(245, 158, 11, 0.12);
}

.speed-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}

.speed-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.3);
  margin-bottom: 8px;
}

.speed-title {
  font-size: 1.45rem;
  color: #fff;
  font-weight: 700;
}

.speed-status {
  font-size: 0.88rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

.status-good {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.35);
}

.metric-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  margin-bottom: 8px;
  margin-top: 18px;
}

.metric-name {
  color: var(--text-muted);
}

.metric-value {
  color: #fff;
  font-weight: 600;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-main);
  border-radius: var(--radius-full);
}

/* Features Section */
.features-section {
  padding: 60px 0 80px;
  position: relative;
  z-index: 1;
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.4);
  background: var(--bg-card-hover);
}

.feature-icon {
  font-size: 2.2rem;
  margin-bottom: 20px;
}

.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: 1.7;
}

/* Pricing Section */
.pricing-section {
  padding: 60px 0 90px;
  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: 40px 32px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-normal);
}

.pricing-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.4);
}

.popular-card {
  border-color: rgba(245, 158, 11, 0.55);
  background: linear-gradient(145deg, rgba(26, 22, 14, 0.92) 0%, rgba(18, 20, 26, 0.92) 100%);
  box-shadow: 0 16px 48px rgba(245, 158, 11, 0.16);
  transform: scale(1.03);
}

.popular-card:hover {
  transform: scale(1.03) translateY(-4px);
}

.plan-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-main);
  color: #0c0a09;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px var(--primary-glow);
  white-space: nowrap;
}

.plan-name {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 8px;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  min-height: 42px;
}

.plan-price {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 28px;
}

.price-currency {
  font-size: 1.5rem;
  color: #fbbf24;
  font-weight: 700;
}

.price-val {
  font-size: 3.2rem;
  font-weight: 850;
  color: #fff;
  font-family: var(--font-mono);
  line-height: 1;
}

.price-cycle {
  font-size: 0.95rem;
  color: var(--text-dim);
}

.plan-features {
  margin-bottom: 36px;
  flex-grow: 1;
}

.plan-features li {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 14px;
  position: relative;
  padding-left: 24px;
}

.plan-features li::before {
  content: "✦";
  position: absolute;
  left: 0;
  color: #fbbf24;
  font-size: 0.85rem;
}

/* Clients Section */
.clients-section {
  padding: 60px 0 80px;
  position: relative;
  z-index: 1;
}

.clients-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 18px;
}

.client-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 14px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.client-card:hover {
  transform: translateY(-4px);
  border-color: rgba(245, 158, 11, 0.45);
}

.client-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.client-name {
  font-size: 1rem;
  color: #fff;
  margin-bottom: 6px;
}

.client-desc {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.4;
}

/* FAQ Section */
.faq-section {
  padding: 60px 0 90px;
  position: relative;
  z-index: 1;
}

.faq-accordion {
  max-width: 860px;
  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: border-color var(--transition-fast);
}

.faq-item.active {
  border-color: rgba(245, 158, 11, 0.5);
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
}

.faq-question:hover {
  color: #fbbf24;
}

.faq-icon::before {
  content: "+";
  font-size: 1.4rem;
  color: #fbbf24;
  font-weight: 300;
}

.faq-item.active .faq-icon::before {
  content: "−";
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  background: rgba(0, 0, 0, 0.2);
}

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

.faq-answer p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.75;
}

/* Articles Section */
.articles-preview-section {
  padding: 60px 0 80px;
  position: relative;
  z-index: 1;
}

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

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.article-tag {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.article-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
  line-height: 1.4;
}

.article-excerpt {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-link {
  color: #fbbf24;
  font-weight: 600;
  font-size: 0.92rem;
  transition: color var(--transition-fast);
}

.article-link:hover {
  color: #fde047;
}

/* CTA Banner */
.cta-banner-section {
  padding: 60px 0 100px;
  position: relative;
  z-index: 1;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(38, 29, 10, 0.95) 0%, rgba(18, 20, 26, 0.95) 100%);
  border: 1px solid rgba(245, 158, 11, 0.45);
  border-radius: var(--radius-lg);
  padding: 64px 32px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

.cta-title {
  font-size: 2.6rem;
  font-weight: 850;
  color: #fff;
  margin-bottom: 16px;
}

.cta-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 36px;
}

/* Footer */
.footer {
  background: #050608;
  border-top: 1px solid var(--border-color);
  padding: 72px 0 36px;
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand-desc {
  font-size: 0.92rem;
  color: var(--text-dim);
  margin-top: 16px;
  line-height: 1.7;
  max-width: 340px;
}

.footer-col-title {
  font-size: 1.05rem;
  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: #fbbf24;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  padding-top: 28px;
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* Responsive */
@media (max-width: 992px) {
  .hero-title { font-size: 2.8rem; }
  .speed-grid, .features-grid, .pricing-grid, .articles-grid { grid-template-columns: 1fr; }
  .popular-card { transform: none; }
  .popular-card:hover { transform: translateY(-4px); }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .clients-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .nav-menu { display: none; }
  .mobile-toggle { display: flex; }
}