/* 奈云 (Naiyun) 官方落地页样式 - 商务简洁科技风格 (Business Tech Clean Style) */
:root {
  --bg-dark: #0b0f19;
  --bg-card: #131b2e;
  --bg-card-hover: #1b2640;
  --bg-glass: rgba(19, 27, 46, 0.85);
  
  --primary: #3b82f6;        /* 商务科技蓝 Primary Blue */
  --primary-hover: #2563eb;
  --accent: #ec4899;         /* 商务霓虹粉紫 Accent Pink */
  --accent-purple: #8b5cf6;
  --success: #10b981;
  
  /* 商务高雅渐变色 */
  --gradient-main: linear-gradient(135deg, #3b82f6 0%, #6366f1 50%, #ec4899 100%);
  --gradient-card: linear-gradient(180deg, rgba(59, 130, 246, 0.08) 0%, rgba(19, 27, 46, 0.6) 100%);
  --gradient-glow: radial-gradient(circle at center, rgba(59, 130, 246, 0.22) 0%, rgba(236, 72, 153, 0.12) 50%, transparent 70%);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border: rgba(255, 255, 255, 0.08);
  --border-active: rgba(59, 130, 246, 0.45);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  
  --shadow-card: 0 12px 32px -8px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.3);
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* 背景商务纹理 */
.bg-glow {
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 1100px;
  height: 700px;
  background: var(--gradient-glow);
  z-index: -1;
  pointer-events: none;
  filter: blur(80px);
}

.bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: -2;
  pointer-events: none;
}

/* 容器规范 */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 头部导航与目录 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

.logo-icon {
  width: 38px;
  height: 38px;
  background: var(--gradient-main);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
}

.logo-icon svg {
  width: 22px;
  height: 22px;
  fill: #ffffff;
}

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

.nav-links a {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* 按钮基础样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-main);
  color: #ffffff;
  box-shadow: 0 4px 18px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.5);
  filter: brightness(1.08);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
}

.btn-full {
  width: 100%;
}

/* 主视觉区 Hero - 左右分布 */
.hero {
  position: relative;
  padding: 5rem 0 4rem;
}

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

.hero-left {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #60a5fa;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -1px;
  margin-bottom: 1.5rem;
}

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

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2.25rem;
  font-weight: 400;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.hero-stats-inline {
  display: flex;
  gap: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.stat-box h4 {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
}

.stat-box p {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 主视觉右侧：纯 CSS3 动态图卡组合 */
.hero-right-visual {
  position: relative;
  height: 440px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 核心中心卡片 */
.hero-main-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), var(--shadow-glow);
  position: relative;
  z-index: 2;
  backdrop-filter: blur(12px);
}

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

.status-pulse {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--success);
}

.pulse-dot {
  width: 10px;
  height: 10px;
  background-color: var(--success);
  border-radius: 50%;
  position: relative;
}

.pulse-dot::after {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border-radius: 50%;
  border: 2px solid var(--success);
  animation: pulseRing 2s infinite ease-out;
}

@keyframes pulseRing {
  0% { transform: scale(0.8); opacity: 1; }
  100% { transform: scale(2.2); opacity: 0; }
}

.ping-speed {
  font-family: monospace;
  font-size: 0.85rem;
  color: #60a5fa;
  background: rgba(59, 130, 246, 0.12);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
}

.node-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.03);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.node-name {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.node-flag {
  font-size: 1.1rem;
}

.node-bar {
  width: 80px;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  overflow: hidden;
}

.node-progress {
  height: 100%;
  background: var(--gradient-main);
  border-radius: 3px;
  animation: waveBar 3s infinite alternate ease-in-out;
}

@keyframes waveBar {
  0% { width: 45%; }
  50% { width: 90%; }
  100% { width: 70%; }
}

/* 动态悬浮小卡片 1 & 2 (纯 CSS 浮动动效) */
.float-card-1 {
  position: absolute;
  top: -15px;
  right: -10px;
  background: rgba(23, 31, 52, 0.92);
  border: 1px solid rgba(236, 72, 153, 0.4);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  z-index: 3;
  animation: floatAnim 4.5s ease-in-out infinite;
}

.float-card-2 {
  position: absolute;
  bottom: -20px;
  left: -15px;
  background: rgba(23, 31, 52, 0.92);
  border: 1px solid rgba(59, 130, 246, 0.4);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  z-index: 3;
  animation: floatAnim 4.5s ease-in-out infinite 2.25s;
}

.float-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(236, 72, 153, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ec4899;
}

.float-card-2 .float-icon {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
}

.float-text p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.float-text h5 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
}

@keyframes floatAnim {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}

/* 通用 Section 标题 */
.section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 3.5rem;
}

.section-tag {
  color: var(--primary);
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1rem;
}

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

/* 核心优势卡片 Section */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2.5rem 2rem;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-card);
}

.feature-icon {
  width: 54px;
  height: 54px;
  background: rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  color: #60a5fa;
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 流媒体与 AI 支持图卡 Section */
.media-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.media-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.media-card-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.media-card-content p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
}

/* 真实代理/机场套餐价格对比表 Section (4列) */
.pricing-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.price-card.featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.15) 0%, var(--bg-card) 100%);
  box-shadow: var(--shadow-glow);
  transform: scale(1.02);
}

.popular-badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-main);
  color: #fff;
  padding: 0.2rem 0.9rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.price-header {
  margin-bottom: 1.25rem;
  text-align: center;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.plan-name {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.price-amount {
  font-size: 2.35rem;
  font-weight: 900;
  color: var(--text-main);
}

.price-currency {
  font-size: 1.3rem;
  vertical-align: super;
  color: var(--primary);
}

.price-period {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 400;
}

.features-list {
  list-style: none;
  margin-bottom: 1.75rem;
  flex-grow: 1;
}

.features-list li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
}

.features-list li.active {
  color: var(--text-main);
}

.check-icon {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--primary);
  stroke-width: 2.5;
  flex-shrink: 0;
}

/* SEO 文章推荐板块 (价格板块下方 3x3 图卡) */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

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

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

.article-card-tag {
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.6rem;
  display: block;
}

.article-card-title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.article-card-desc {
  color: var(--text-muted);
  font-size: 0.88rem;
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  transition: gap 0.2s ease;
}

.article-card-link:hover {
  gap: 0.7rem;
  color: #60a5fa;
}

/* 用户评价 Section */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-style: italic;
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

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

.user-details h4 {
  font-size: 1rem;
  font-weight: 700;
}

.user-details p {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* FAQ 常见问题 Section */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--border-active);
}

.faq-title {
  padding: 1.25rem 1.5rem;
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

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

.faq-title::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-title::after {
  content: "−";
  color: var(--primary);
}

.faq-content {
  padding: 0 1.5rem 1.25rem 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* 页脚 Footer - 严格保留 4 个标题在新页面打开 */
.footer {
  background: #070a12;
  border-top: 1px solid var(--border);
  padding: 4rem 0 2.5rem;
  margin-top: 4rem;
}

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

.footer-logo {
  margin-bottom: 1rem;
}

.footer-desc {
  color: var(--text-dim);
  font-size: 0.9rem;
  max-width: 450px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2.5rem;
  margin-bottom: 3rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.footer-nav-link {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  transition: color 0.2s ease;
  position: relative;
}

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

.footer-bottom {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* 独立子页面通用样式 (about, terms, privacy, sitemap) */
.page-header {
  padding: 5rem 0 3rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.08) 0%, transparent 100%);
  border-bottom: 1px solid var(--border);
}

.page-title {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: 1rem;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.content-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 3rem;
  margin: 3rem 0;
  box-shadow: var(--shadow-card);
}

.content-box h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2rem 0 1rem;
  color: var(--text-main);
  border-left: 4px solid var(--primary);
  padding-left: 0.75rem;
}

.content-box h2:first-child {
  margin-top: 0;
}

.content-box p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.content-box ul {
  color: var(--text-muted);
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.sitemap-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
}

.sitemap-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--primary);
}

.sitemap-card ul {
  list-style: none;
  padding: 0;
}

.sitemap-card li {
  margin-bottom: 0.75rem;
}

.sitemap-card a {
  color: var(--text-muted);
  transition: color 0.2s;
}

.sitemap-card a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

/* 响应式媒体查询 Responsive Breakpoints */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  
  .hero-left {
    text-align: center;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-stats-inline {
    justify-content: center;
  }
  
  .pricing-grid-4,
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .features-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero {
    padding: 3.5rem 0 2rem;
  }
  
  .hero-title {
    font-size: 2.25rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .pricing-grid-4,
  .articles-grid,
  .features-grid,
  .media-grid,
  .testimonials-grid,
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 1.25rem;
  }
  
  .content-box {
    padding: 1.75rem;
  }
}