/* ==========================================
   WgetCloud 2026 旗舰版网络加速服务 - 原生 CSS 样式表 
   主题风格：Grey Background with Blue & Steel Accents (高质感灰色背景)
   特点：零外部依赖、响应式移动端优先、现代 Typography 字体
   ========================================== */

/* 1. CSS 自定义变量 - 高质感灰色背景 (Sleek Grey Background) */
:root {
  --bg-dark: #121620;        /* 主背景灰色 */
  --bg-card: #19202e;        /* 卡片中灰色 */
  --bg-card-hover: #222b3d;  /* 卡片 Hover 浅灰 */
  --bg-subtle: rgba(255, 255, 255, 0.04);
  
  --border-color: rgba(255, 255, 255, 0.1);
  --border-glow: rgba(59, 130, 246, 0.35);
  --border-steel: rgba(148, 163, 184, 0.25);
  
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #475569;
  --accent-blue: #3b82f6;
  --accent-ice: #60a5fa;
  --accent-cyan: #38bdf8;
  --accent-emerald: #10b981;
  --accent-slate: #94a3b8;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #64748b;
  
  /* 灰底渐变套系 (Grey Theme Palette) */
  --gradient-brand: linear-gradient(135deg, #2563eb 0%, #1d4ed8 50%, #475569 100%);
  --gradient-title: linear-gradient(135deg, #ffffff 0%, #93c5fd 45%, #cbd5e1 100%);
  --gradient-card: linear-gradient(180deg, #19202e 0%, #141a26 100%);
  --gradient-badge: linear-gradient(90deg, rgba(37, 99, 235, 0.18), rgba(148, 163, 184, 0.2));
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.16), transparent 60%);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 9999px;
  
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-card: 0 12px 30px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 35px rgba(59, 130, 246, 0.22);
  
  /* Typography 配置 */
  --font-family: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --container-max: 1200px;
}

/* 2. 全局 Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.16), transparent 55%),
    radial-gradient(circle at 85% 65%, rgba(148, 163, 184, 0.08), transparent 45%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 3. 常见组件与通用类 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.9rem 1.85rem;
  font-size: 0.98rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  border: none;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.6);
  filter: brightness(1.12);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
  border: 1px solid var(--border-steel);
  backdrop-filter: blur(8px);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(148, 163, 184, 0.35);
  transform: translateY(-3px);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.1rem;
  background: var(--gradient-badge);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: var(--radius-pill);
  color: #cbd5e1;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent-emerald);
  animation: pulseDot 2s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.3; transform: scale(0.8); }
}

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

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.85rem;
  background: linear-gradient(180deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* 4. Navbar 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(18, 22, 32, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.03em;
}

.logo-icon {
  width: 34px;
  height: 34px;
  background: var(--gradient-brand);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  box-shadow: 0 0 15px rgba(37, 99, 235, 0.4);
}

.logo-highlight {
  color: var(--accent-cyan);
}

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

.nav-menu a {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.94rem;
  transition: color 0.2s ease;
}

.nav-menu a:hover {
  color: var(--accent-cyan);
}

.nav-cta {
  padding: 0.6rem 1.35rem;
  font-size: 0.9rem;
}

/* 5. Hero 主视觉区 */
.hero {
  padding: 4.5rem 0 4rem 0;
  text-align: center;
  position: relative;
}

.hero-header-box {
  max-width: 920px;
  margin: 0 auto 3rem auto;
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.04em;
}

.hero-title .brand-highlight {
  background: var(--gradient-title);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 780px;
  margin: 0 auto 2.25rem auto;
}

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

/* 2-Column 灰底控制面板画廊 (.hero-dashboard-grid) */
.hero-dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
  text-align: left;
  max-width: 1080px;
  margin: 0 auto;
}

.dashboard-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.25rem;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
}

.live-pulse-badge {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(16, 185, 129, 0.25);
  font-family: var(--font-mono);
}

.nodes-monitor-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 600;
}

.node-ping {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-emerald);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
}

.ping-bar-anim {
  width: 45px;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.ping-bar-fill {
  height: 100%;
  width: 60%;
  background: var(--accent-emerald);
  position: absolute;
  left: 0;
  animation: waveBar 2s infinite ease-in-out;
}

@keyframes waveBar {
  0% { width: 40%; left: 0%; }
  50% { width: 85%; left: 15%; }
  100% { width: 40%; left: 0%; }
}

.stats-features-box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.speed-meter-box {
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.meter-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.meter-val {
  font-weight: 800;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 1.15rem;
}

.equalizer-anim {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 28px;
}

.eq-bar {
  flex: 1;
  background: var(--gradient-brand);
  border-radius: 2px 2px 0 0;
  height: 20%;
  animation: eqJump 1.4s infinite ease-in-out alternate;
}

.eq-bar:nth-child(1) { animation-delay: 0.1s; }
.eq-bar:nth-child(2) { animation-delay: 0.4s; }
.eq-bar:nth-child(3) { animation-delay: 0.2s; }
.eq-bar:nth-child(4) { animation-delay: 0.6s; }
.eq-bar:nth-child(5) { animation-delay: 0.3s; }
.eq-bar:nth-child(6) { animation-delay: 0.5s; }
.eq-bar:nth-child(7) { animation-delay: 0.2s; }

@keyframes eqJump {
  0% { height: 20%; }
  100% { height: 95%; }
}

/* 6. Core Advantages 产品核心优势 */
.advantages {
  padding: 4.5rem 0;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  transition: all 0.3s ease;
  position: relative;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.card-icon {
  width: 52px;
  height: 52px;
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-blue);
  margin-bottom: 1.35rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 7. Streaming & AI 支持图卡 */
.support-section {
  padding: 4.5rem 0;
  background: rgba(25, 32, 46, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.support-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.support-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
}

.support-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.1rem;
  width: fit-content;
}

.tag-stream { background: rgba(59, 130, 246, 0.15); color: #60a5fa; border: 1px solid rgba(59, 130, 246, 0.3); }
.tag-ai { background: rgba(56, 189, 248, 0.15); color: #38bdf8; border: 1px solid rgba(56, 189, 248, 0.3); }
.tag-biz { background: rgba(148, 163, 184, 0.15); color: #cbd5e1; border: 1px solid rgba(148, 163, 184, 0.3); }

.platform-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.35rem;
}

.platform-pill {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  color: var(--text-main);
}

/* 8. Pricing 套餐价格对比表 */
.pricing {
  padding: 4.5rem 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.85rem;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.price-card.featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-glow);
  background: var(--gradient-card);
}

.popular-badge {
  position: absolute;
  top: -14px;
  right: 24px;
  background: var(--gradient-brand);
  color: white;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.3rem 0.95rem;
  border-radius: var(--radius-pill);
}

.price-header {
  margin-bottom: 1.35rem;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.45rem;
}

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

.price-amount {
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-mono);
  margin: 1rem 0;
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.price-currency {
  font-size: 1.3rem;
  font-weight: 600;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 400;
  font-family: var(--font-family);
}

.features-list {
  list-style: none;
  margin: 1.35rem 0 2.25rem 0;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.features-list li {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.check-icon {
  width: 18px;
  height: 18px;
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* 9. SEO 9大文章图卡板块 */
.articles-section {
  padding: 4.5rem 0;
  background: rgba(25, 32, 46, 0.6);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.2);
}

.article-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.9rem;
}

.article-category {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.25rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.article-date {
  font-size: 0.78rem;
  color: var(--text-dark);
  font-family: var(--font-mono);
}

.article-card-title {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.45;
  color: var(--text-main);
}

.article-card-title a:hover {
  color: var(--accent-cyan);
}

.article-card-summary {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.35rem;
  flex-grow: 1;
}

.article-read-more {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: color 0.2s ease;
}

.article-read-more:hover {
  color: var(--accent-cyan);
}

/* 10. Reviews 用户评价 */
.reviews {
  padding: 4.5rem 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.review-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.1rem;
}

.avatar-placeholder {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gradient-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: white;
}

.user-info h4 {
  font-size: 1.02rem;
  font-weight: 600;
}

.user-info p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.rating-stars {
  color: #f59e0b;
  margin-bottom: 0.85rem;
  font-size: 0.9rem;
}

.review-text {
  font-size: 0.93rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 11. FAQ 常见问题解答 */
.faq {
  padding: 4.5rem 0;
}

.faq-list {
  max-width: 850px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

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

.faq-item details summary {
  padding: 1.25rem 1.6rem;
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-item details summary::-webkit-details-marker {
  display: none;
}

.faq-item details summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--primary);
}

.faq-item details[open] summary::after {
  content: "−";
}

.faq-content {
  padding: 0 1.6rem 1.35rem 1.6rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  margin-top: 0.5rem;
  padding-top: 1.1rem;
}

/* 12. Footer 页脚 */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 3.5rem 0 2.5rem 0;
  background: #0e121a;
  text-align: center;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.85rem 2.75rem;
  list-style: none;
  margin-bottom: 2rem;
}

.footer-nav a {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.98rem;
  transition: color 0.2s ease;
}

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

.copyright {
  color: var(--text-dark);
  font-size: 0.88rem;
}

/* 13. 响应式 Media Queries */
@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }
  
  .cards-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .support-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .articles-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .reviews-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 992px) {
  .hero-title {
    font-size: 3.4rem;
  }
  
  .hero-dashboard-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}