/* 极速cluod - 极简科技风样式表 (Strict UTF-8) */
:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(59, 130, 246, 0.3);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --accent-purple: #8b5cf6;
  --gradient-primary: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-btn: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  --gradient-btn-hover: linear-gradient(135deg, #1d4ed8 0%, #6d28d9 100%);
  --gradient-card: linear-gradient(180deg, rgba(30, 41, 59, 0.5) 0%, rgba(15, 23, 42, 0.8) 100%);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.25);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-width: 1200px;
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  overflow-x: hidden;
  position: relative;
  background: radial-gradient(circle at 50% 0%, #1e1b4b 0%, #090d16 60%);
  background-attachment: fixed;
}

/* 布局网格与背景效果 */
.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  position: relative;
  z-index: 1;
}

section {
  padding: 90px 0;
  position: relative;
}

/* Header & 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  cursor: pointer;
  transition: var(--transition);
}

.logo:hover {
  transform: scale(1.03);
  filter: drop-shadow(0 0 10px rgba(6, 182, 212, 0.5));
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--gradient-primary);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 900;
  box-shadow: var(--shadow-glow);
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
}

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

.nav-cta {
  background: var(--gradient-btn);
  color: #fff;
  padding: 8px 20px;
  border-radius: 20px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

/* 按钮基础通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 30px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  line-height: 1;
}

.btn-primary {
  background: var(--gradient-btn);
  color: #ffffff;
  box-shadow: 0 4px 25px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(37, 99, 235, 0.6);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(5px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  transform: translateY(-3px);
}

/* Hero Section 主视觉区 */
.hero {
  padding-top: 150px;
  padding-bottom: 100px;
  min-height: 90vh;
  display: flex;
  align-items: center;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 50px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 20px;
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
  100% { opacity: 0.4; transform: scale(0.9); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
}

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

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 35px;
  max-width: 580px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 30px;
}

.hero-features-list {
  display: flex;
  gap: 25px;
  list-style: none;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.hero-features-list li {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-features-list svg {
  color: var(--accent-cyan);
}

/* 动态视觉图卡右侧 */
.hero-visual {
  position: relative;
}

.tech-card-wrapper {
  position: relative;
  width: 100%;
  height: 380px;
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 30px;
  backdrop-filter: blur(10px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
}

.tech-card-wrapper::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.1) 0%, transparent 60%);
  animation: rotate 15s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.tech-status-header {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 15px;
}

.tech-status-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.speed-meter {
  position: relative;
  z-index: 2;
  text-align: center;
  margin: 20px 0;
}

.speed-number {
  font-size: 4.5rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}

.speed-unit {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-top: 5px;
}

.node-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.node-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 10px;
  border-radius: 8px;
  text-align: center;
  font-size: 0.8rem;
}

.node-name {
  color: var(--text-primary);
  font-weight: 600;
}

.node-ping {
  color: #10b981;
  font-size: 0.75rem;
  margin-top: 2px;
}

/* 标题通用 */
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-tag {
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 15px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* 核心优势区 Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 35px 25px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.feature-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 12px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  color: var(--accent-cyan);
  transition: var(--transition);
}

.feature-card:hover .feature-icon-box {
  background: var(--gradient-primary);
  color: #fff;
  transform: scale(1.1);
}

.feature-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* 流媒体与 AI 支持区 */
.services-section {
  background: rgba(15, 23, 42, 0.4);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.service-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 35px;
}

.service-block-header {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 25px;
}

.service-block-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: rgba(139, 92, 246, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-purple);
}

.service-block-title {
  font-size: 1.3rem;
  font-weight: 700;
}

.service-badges-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.badge-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 15px 10px;
  text-align: center;
  transition: var(--transition);
}

.badge-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
}

.badge-item-name {
  font-size: 0.9rem;
  font-weight: 600;
  margin-top: 8px;
  color: var(--text-primary);
}

.badge-item-sub {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* 套餐价格表 Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 40px 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
}

.pricing-card.featured {
  background: linear-gradient(180deg, rgba(37, 99, 235, 0.15) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 2px solid var(--accent-blue);
  box-shadow: 0 0 35px rgba(37, 99, 235, 0.25);
  transform: scale(1.04);
}

.pricing-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.pricing-header {
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 25px;
  margin-bottom: 25px;
}

.pricing-plan-name {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1;
}

.pricing-price span {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin-bottom: 30px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 14px;
}

.pricing-features li svg {
  color: #10b981;
  flex-shrink: 0;
}

/* 12篇 SEO 文章卡片区 (价格表下方) */
.articles-section {
  background: rgba(15, 23, 42, 0.3);
  border-top: 1px solid var(--border-color);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 25px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.article-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(6, 182, 212, 0.15);
}

.article-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 3px 10px;
  border-radius: 12px;
  display: inline-block;
  margin-bottom: 12px;
  width: fit-content;
}

.article-title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.article-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

.article-excerpt {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 12px;
}

.article-link {
  color: var(--accent-blue);
  text-decoration: none;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 4px;
}

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

/* FAQ 区 */
.faq-grid {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 20px 25px;
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
  color: var(--accent-cyan);
}

.faq-answer {
  padding: 0 25px 20px 25px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  display: none;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: -5px;
  padding-top: 15px;
}

.faq-item.active .faq-answer {
  display: block;
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
}

/* 用户评价 Testimonials */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 30px 25px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.testimonial-stars {
  color: #f59e0b;
  margin-bottom: 15px;
  display: flex;
  gap: 4px;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  font-style: italic;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.author-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
}

.author-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.author-role {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 页脚 Footer 规范 */
.footer {
  background: #05080f;
  border-top: 1px solid var(--border-color);
  padding: 60px 0 30px;
}

.footer-nav-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  margin-bottom: 50px;
  text-align: center;
}

.footer-column {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 25px 15px;
  transition: var(--transition);
}

.footer-column:hover {
  border-color: var(--accent-cyan);
  background: rgba(255, 255, 255, 0.04);
}

.footer-column-title {
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.footer-column-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 15px;
}

.footer-link-btn {
  display: inline-block;
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-link-btn:hover {
  color: #fff;
  text-decoration: underline;
}

/* 页脚 PBN 外链与版权居中模块 */
.footer-pbn-section {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 30px;
  text-align: center;
}

.pbn-links-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 20px;
  margin-bottom: 15px;
  font-size: 0.92rem;
}

.pbn-link {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 8px;
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  transition: var(--transition);
}

.pbn-link:hover {
  color: #ffffff;
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.4);
}

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

/* 右侧浮动章节上下控制箭头 */
.section-nav-widget {
  position: fixed;
  right: 25px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 999;
}

.nav-arrow-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid var(--accent-cyan);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
  transition: var(--transition);
}

.nav-arrow-btn:hover {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  transform: scale(1.15);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.6);
}

.nav-arrow-btn:active {
  transform: scale(0.95);
}

/* 响应式媒体查询（手机端单栏优化） */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-subtitle {
    margin: 0 auto 30px;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-features-list {
    justify-content: center;
  }

  .features-grid,
  .pricing-grid,
  .articles-grid,
  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.featured {
    transform: none;
  }
}

@media (max-width: 768px) {
  .header-container {
    height: 60px;
  }

  .nav-menu {
    display: none; /* 极简纯CSS移动端收起或简约导航 */
  }

  .hero {
    padding-top: 110px;
    padding-bottom: 60px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .features-grid,
  .services-grid,
  .pricing-grid,
  .articles-grid,
  .testimonials-grid,
  .footer-nav-grid {
    grid-template-columns: 1fr;
  }

  .service-badges-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .btn {
    width: 100%;
    padding: 16px 20px;
    font-size: 1.05rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .section-nav-widget {
    right: 12px;
  }

  .nav-arrow-btn {
    width: 40px;
    height: 40px;
  }
}