/* ==========================================================================
   宝贝云官网 - 全局轻量原生 CSS 样式表 (Zero-Dependency Native CSS)
   ========================================================================== */

:root {
  --color-bg: #090d16;
  --color-surface: #111827;
  --color-surface-hover: #1f2937;
  --color-surface-card: #131d31;
  --color-border: #1f293d;
  --color-border-focus: #3b82f6;
  --color-text-main: #f8fafc;
  --color-text-muted: #94a3b8;
  --color-text-subtle: #64748b;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-accent: #38bdf8;
  --color-accent-amber: #f59e0b;
  --color-accent-green: #10b981;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 35px -5px rgba(37, 99, 235, 0.25);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@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;
  }
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 50% 0%, #172554 0%, #090d16 60%);
  background-attachment: fixed;
  position: relative;
  overflow-x: hidden;
}

/* 全局极速网络数据流背景粒子 (Cyber Network Speed Grid) */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  background-image: 
    radial-gradient(1.5px 1.5px at 40px 60px, rgba(56, 189, 248, 0.4), rgba(0, 0, 0, 0)),
    radial-gradient(1.2px 1.2px at 120px 180px, rgba(129, 140, 248, 0.35), rgba(0, 0, 0, 0)),
    radial-gradient(1.5px 1.5px at 240px 90px, rgba(56, 189, 248, 0.3), rgba(0, 0, 0, 0)),
    radial-gradient(2px 2px at 320px 260px, rgba(37, 99, 235, 0.4), rgba(0, 0, 0, 0));
  background-repeat: repeat;
  background-size: 360px 360px;
  animation: networkStreamFlow 16s linear infinite;
  opacity: 0.7;
}

@keyframes networkStreamFlow {
  0% { transform: translateY(0); }
  100% { transform: translateY(-360px); }
}

/* 无障碍跳转入口 */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background: var(--color-primary);
  color: #ffffff;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
  font-weight: 600;
  transition: top 0.2s ease;
}
.skip-link:focus {
  top: 16px;
  outline: 3px solid #ffffff;
}

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

/* 锚点滚动留白 */
[id] {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* 链接与按钮通用 */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}
a:hover {
  color: #60a5fa;
  text-decoration: underline;
}
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 4px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(9, 13, 22, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
  position: relative;
}

/* 顶部光纤极速激光传输动效 (Fiber Optic Speed Laser) */
.site-header::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(37, 99, 235, 0.2) 20%,
    rgba(56, 189, 248, 0.8) 45%,
    #ffffff 50%,
    rgba(56, 189, 248, 0.8) 55%,
    rgba(37, 99, 235, 0.2) 80%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: fiberSpeedBeam 2.8s linear infinite;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.7);
  pointer-events: none;
}

@keyframes fiberSpeedBeam {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

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

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.brand-logo {
  height: 40px;
  width: auto;
  display: block;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-link {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 4px;
  text-decoration: none;
  transition: color 0.2s ease;
}
.nav-link:hover, .nav-link.active {
  color: #ffffff;
  text-decoration: none;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-align: center;
}
.btn-primary {
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #3b82f6 100%);
  color: #ffffff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.4), 0 0 12px rgba(56, 189, 248, 0.2);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -80%;
  width: 50%;
  height: 200%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.45) 50%,
    transparent 100%
  );
  transform: rotate(25deg);
  animation: btnSpeedShimmer 3.2s infinite cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}
.btn-primary:hover {
  background: linear-gradient(135deg, #1e40af 0%, #1d4ed8 50%, #2563eb 100%);
  color: #ffffff;
  text-decoration: none;
  box-shadow: 0 6px 22px rgba(37, 99, 235, 0.6), 0 0 20px rgba(56, 189, 248, 0.4);
  transform: translateY(-1px);
}

@keyframes btnSpeedShimmer {
  0% { left: -80%; }
  35% { left: 140%; }
  100% { left: 140%; }
}
.btn-outline {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-main);
}
.btn-outline:hover {
  background-color: var(--color-surface);
  border-color: var(--color-accent);
  color: #ffffff;
  text-decoration: none;
}
.btn-sm {
  min-height: 38px;
  padding: 6px 14px;
  font-size: 0.875rem;
}

/* 主视觉区 (Hero) */
.hero-section {
  padding: 72px 0 60px;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.35);
  padding: 6px 18px;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(37, 99, 235, 0.15);
}
.hero-badge::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-accent-green);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.8);
  animation: radarPulse 1.8s infinite;
}
@keyframes radarPulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.8); }
  70% { transform: scale(1.05); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}
.hero-title {
  font-size: 2.85rem;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  color: #ffffff;
}
.hero-title .text-gradient {
  background: linear-gradient(135deg, #60a5fa 0%, #38bdf8 50%, #93c5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-trust {
  margin-top: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  color: var(--color-text-subtle);
  font-size: 0.875rem;
  flex-wrap: wrap;
}
.hero-trust span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-text-muted);
}

/* 通用章节 */
.section {
  padding: 64px 0;
}
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 48px;
}
.section-tag {
  color: var(--color-accent);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}
.section-desc {
  font-size: 1rem;
  color: var(--color-text-muted);
}

/* 核心优势卡片 (3列) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.feature-card::before, .unlock-card::before, .pricing-card::before, .article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, #38bdf8, #60a5fa, transparent);
  opacity: 0;
  pointer-events: none;
}
.feature-card:hover::before, .unlock-card:hover::before, .pricing-card:hover::before, .article-card:hover::before {
  opacity: 1;
  animation: cardSpeedScan 1.2s ease infinite;
}
@keyframes cardSpeedScan {
  0% { left: -100%; }
  100% { left: 100%; }
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.5);
  box-shadow: 0 12px 30px -5px rgba(0, 0, 0, 0.5), 0 0 20px rgba(37, 99, 235, 0.2);
}
.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(37, 99, 235, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--color-accent);
}
.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 流媒体与 AI 支持卡片 (2列大卡片) */
.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.unlock-card {
  background: linear-gradient(180deg, #131d31 0%, #0e1626 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 30px;
  position: relative;
  overflow: hidden;
}
.unlock-card h3 {
  font-size: 1.35rem;
  color: #ffffff;
  margin-bottom: 12px;
}
.unlock-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 24px;
}
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.tag-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  color: #e2e8f0;
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* 价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}
.pricing-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 22px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.pricing-card.featured {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, #172554 0%, #111d33 100%);
  box-shadow: var(--shadow-glow);
  transform: scale(1.03);
}
.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #2563eb, #38bdf8);
  color: #ffffff;
  padding: 4px 14px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.pricing-header {
  text-align: center;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 20px;
  margin-bottom: 20px;
}
.pricing-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}
.pricing-price {
  font-size: 2.2rem;
  font-weight: 800;
  color: #ffffff;
}
.pricing-price span {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--color-text-muted);
}
.pricing-desc {
  font-size: 0.85rem;
  color: var(--color-text-subtle);
  margin-top: 6px;
}
.pricing-features {
  list-style: none;
  flex-grow: 1;
  margin-bottom: 24px;
}
.pricing-features li {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.05);
}
.pricing-features li::before {
  content: "✔";
  color: var(--color-accent-green);
  font-weight: bold;
}
.pricing-card .btn {
  width: 100%;
}

/* 价格对比详细表格（用于规范的语义化 table 与横向滚动支持） */
.table-wrapper {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-top: 32px;
}
.compare-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 640px;
}
.compare-table caption {
  padding: 16px;
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
.compare-table th, .compare-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
}
.compare-table th {
  background: rgba(255, 255, 255, 0.03);
  color: #ffffff;
  font-weight: 600;
}
.compare-table td {
  color: var(--color-text-muted);
}
.compare-table tr:last-child td {
  border-bottom: none;
}

/* 用户评价区 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.review-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
}
.review-rating {
  color: var(--color-accent-amber);
  margin-bottom: 12px;
  font-size: 1rem;
  letter-spacing: 2px;
}
.review-content {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  line-height: 1.6;
  margin-bottom: 18px;
  flex-grow: 1;
}
.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 0.95rem;
}
.author-info h4 {
  font-size: 0.95rem;
  color: #ffffff;
}
.author-info span {
  font-size: 0.8rem;
  color: var(--color-text-subtle);
}

/* FAQ 常见问题解答（默认展开） */
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-item {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item[open] {
  border-color: rgba(59, 130, 246, 0.4);
}
.faq-question {
  padding: 18px 22px;
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.faq-question::-webkit-details-marker {
  display: none;
}
.faq-question::after {
  content: "▾";
  font-size: 1.2rem;
  color: var(--color-accent);
  transition: transform 0.2s ease;
}
.faq-item[open] .faq-question::after {
  transform: rotate(180deg);
}
.faq-answer {
  padding: 0 22px 20px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 8px;
  padding-top: 14px;
}
.faq-answer a {
  color: var(--color-accent);
  text-decoration: underline;
}

/* 博客/知识库列表与文章页面样式 */
.article-header {
  padding: 48px 0 24px;
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}
.breadcrumbs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-subtle);
  margin-bottom: 20px;
}
.breadcrumbs a {
  color: var(--color-text-muted);
}
.article-title {
  font-size: 2.3rem;
  color: #ffffff;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--color-text-subtle);
}

.article-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 0 60px;
  font-size: 1.05rem;
  line-height: 1.85;
  color: #cbd5e1;
}
.article-content h2 {
  font-size: 1.6rem;
  color: #ffffff;
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}
.article-content h3 {
  font-size: 1.3rem;
  color: #f1f5f9;
  margin: 28px 0 12px;
}
.article-content p {
  margin-bottom: 18px;
}
.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 12px 20px;
  background: var(--color-surface);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: #e2e8f0;
}
.article-callout {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.15) 0%, rgba(56, 189, 248, 0.1) 100%);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 32px 0;
  text-align: center;
}
.article-callout h3 {
  margin-top: 0;
  color: #ffffff;
}

/* 知识库文章列表卡片网格 */
.knowledge-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.article-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
}
.article-card-tag {
  font-size: 0.75rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 10px;
  text-transform: uppercase;
}
.article-card h3 {
  font-size: 1.15rem;
  color: #ffffff;
  margin-bottom: 12px;
  line-height: 1.4;
}
.article-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}
.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--color-text-subtle);
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
}

/* 页脚 */
.site-footer {
  margin-top: auto;
  background-color: #070a10;
  border-top: 1px solid var(--color-border);
  padding: 40px 0;
}
.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}
.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}
.footer-nav a {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  padding: 8px;
}
.footer-nav a:hover {
  color: #ffffff;
  text-decoration: underline;
}
.footer-copy {
  color: var(--color-text-subtle);
  font-size: 0.85rem;
  text-align: center;
}

/* 响应式媒体查询适配 */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid, .reviews-grid, .knowledge-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
  }
  .hero-title {
    font-size: 2.1rem;
  }
  .features-grid, .unlock-grid, .pricing-grid, .reviews-grid, .knowledge-grid {
    grid-template-columns: 1fr;
  }
  .main-nav {
    display: none; /* 移动端保持极简清爽体验 */
  }
  .pricing-card.featured {
    transform: none;
  }
  .footer-nav {
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }
  .hero-title {
    font-size: 1.75rem;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .btn {
    min-height: 48px; /* 移动端更利于手指触控 */
  }
  .network-speed-hud {
    bottom: 12px;
    right: 12px;
    padding: 6px 12px;
    font-size: 0.75rem;
  }
  .network-speed-hud .hud-extra {
    display: none;
  }
}

/* ==========================================================================
   全局网络加速悬浮指示器 (Network Speed Telemetry HUD)
   ========================================================================== */
.network-speed-hud {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(11, 17, 32, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 9999px;
  padding: 8px 18px;
  font-size: 0.825rem;
  color: #e2e8f0;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5), 0 0 20px rgba(37, 99, 235, 0.25);
  user-select: none;
  text-decoration: none;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.network-speed-hud:hover {
  transform: translateY(-2px);
  border-color: rgba(56, 189, 248, 0.75);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.6), 0 0 25px rgba(56, 189, 248, 0.4);
  color: #ffffff;
  text-decoration: none;
}
.network-speed-hud .hud-ping {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #10b981;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.8);
  animation: radarPulse 1.8s infinite;
  display: inline-block;
}
.network-speed-hud .hud-title {
  font-weight: 600;
  color: #f8fafc;
}
.network-speed-hud .hud-val {
  color: #38bdf8;
  font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
.network-speed-hud .hud-divider {
  color: #475569;
}

/* ==========================================================================
   鼠标交互网络加速高亮与光子感应 (Interactive Hover Speed Acceleration)
   ========================================================================== */
a, button, summary, .tag-item, .pricing-card, .feature-card, .unlock-card, .article-card, .review-card {
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

a:hover {
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.8), 0 0 20px rgba(37, 99, 235, 0.5);
}

/* 导航链接悬停极速微电流 */
.nav-link:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.9);
}

/* 问答悬停高亮电流条 */
.faq-question:hover {
  background: rgba(37, 99, 235, 0.1);
  color: #38bdf8;
  box-shadow: inset 3px 0 0 0 #38bdf8;
}

/* 表格行悬停光速感应 */
.compare-table tr:hover td {
  background: rgba(56, 189, 248, 0.06);
  color: #ffffff;
}

/* 标签胶囊悬停微充能 */
.tag-item:hover {
  border-color: #38bdf8;
  background: rgba(56, 189, 248, 0.15);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}