/* 坨坨云 (tuotuoyun.mom) - 全局样式库 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

:root {
  /* 基础色彩系统 */
  --bg-primary: #0b0819;
  --bg-secondary: #140d2b;
  --bg-gradient: linear-gradient(135deg, #090616 0%, #160e36 40%, #25164d 75%, #381f66 100%);
  --bg-card: rgba(26, 17, 53, 0.65);
  --bg-card-hover: rgba(42, 28, 82, 0.85);
  --border-color: rgba(168, 85, 247, 0.2);
  --border-glow: rgba(236, 72, 153, 0.4);

  /* 品牌黄金/亮色体系 */
  --gold-primary: #ffd700;
  --gold-secondary: #ffa500;
  --gold-gradient: linear-gradient(135deg, #FFF59D 0%, #FBC02D 40%, #FFA000 80%, #FF8F00 100%);
  --cyan-accent: #00f2fe;
  --purple-accent: #8a2be2;
  --pink-accent: #ff007f;

  /* 文字颜色 */
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-light: #cbd5e1;

  /* 字体系统 */
  --font-family: 'Noto Sans SC', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* 杂项 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-glow: 0 10px 30px -10px rgba(138, 43, 226, 0.5);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* 科技黄金渐变文本类别 */
.gold-text {
  background: var(--gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  text-shadow: 0 0 30px rgba(255, 193, 7, 0.2);
}

.cyan-text {
  background: linear-gradient(135deg, #38ef7d, #11998e);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 渐变文本高亮 */
.gradient-heading {
  background: linear-gradient(135deg, #ffffff 0%, #e2e8f0 40%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 导航栏 Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(11, 8, 25, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(168, 85, 247, 0.15);
  padding: 15px 0;
  transition: var(--transition);
}

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

.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #7b2cbf 0%, #b5179e 50%, #ff007f 100%);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 20px rgba(255, 0, 127, 0.55), 0 0 10px rgba(123, 44, 191, 0.35);
  transition: var(--transition);
}

.logo-group:hover .logo-icon {
  transform: rotate(6deg) scale(1.08);
  box-shadow: 0 0 28px rgba(255, 0, 127, 0.8), 0 0 14px rgba(123, 44, 191, 0.5);
}

.logo-text {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 30px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a:hover {
  color: #ffffff;
  text-shadow: 0 0 10px rgba(168, 85, 247, 0.8);
}

.nav-actions {
  display: flex;
  gap: 14px;
  align-items: center;
}

/* 按钮基础设计 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
}

.btn-primary {
  background: linear-gradient(135deg, #8a2be2 0%, #ff007f 100%);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(255, 0, 127, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 0, 127, 0.7);
  filter: brightness(1.1);
}

.btn-gold {
  background: var(--gold-gradient);
  color: #1a0f35;
  box-shadow: 0 4px 20px rgba(255, 193, 7, 0.4);
}

.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(255, 193, 7, 0.7);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background: rgba(168, 85, 247, 0.2);
  border-color: rgba(168, 85, 247, 0.5);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  padding: 160px 0 80px 0;
  position: relative;
  text-align: center;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(138, 43, 226, 0.25) 0%, rgba(255, 0, 127, 0.15) 50%, rgba(0, 0, 0, 0) 70%);
  filter: blur(80px);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 30px;
  background: rgba(138, 43, 226, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  font-size: 14px;
  color: #e9d5ff;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 52px;
  font-weight: 900;
  line-height: 1.25;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px auto;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

/* 动态数据条 Live Stats Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 30px 20px;
  margin-top: 40px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-size: 32px;
  font-weight: 800;
  font-family: 'Inter', sans-serif;
}

.stat-label {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* 关键区域标题 Section Header */
.section-header {
  text-align: center;
  max-width: 750px;
  margin: 0 auto 60px auto;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--text-muted);
}

/* 浮动卡片关键帧 Floating Cards Animation */
@keyframes floatAnimation {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-12px);
  }
  100% {
    transform: translateY(0px);
  }
}

.floating-card {
  animation: floatAnimation 6s ease-in-out infinite;
  transition: var(--transition);
}

.floating-card:hover {
  animation-play-state: paused;
  transform: translateY(-15px) scale(1.02) !important;
  box-shadow: 0 20px 40px rgba(138, 43, 226, 0.4);
  border-color: rgba(236, 72, 153, 0.6);
}

/* 浮动卡片错开动画时间 */
.floating-delay-1 { animation-delay: 0s; }
.floating-delay-2 { animation-delay: 1.5s; }
.floating-delay-3 { animation-delay: 3s; }
.floating-delay-4 { animation-delay: 4.5s; }

/* 价格表区 Pricing Section */
.pricing-section {
  padding: 100px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  backdrop-filter: blur(12px);
  position: relative;
  display: flex;
  flex-direction: column;
}

.price-card.popular {
  border-color: rgba(255, 193, 7, 0.6);
  background: rgba(36, 22, 74, 0.85);
  box-shadow: 0 0 30px rgba(255, 193, 7, 0.25);
}

.popular-badge {
  position: absolute;
  top: -15px;
  right: 24px;
  background: var(--gold-gradient);
  color: #000;
  font-weight: 800;
  font-size: 12px;
  padding: 4px 14px;
  border-radius: 20px;
  text-transform: uppercase;
}

.price-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.price-desc {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.price-amount {
  font-size: 42px;
  font-weight: 900;
  margin-bottom: 24px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-period {
  font-size: 16px;
  color: var(--text-muted);
  font-weight: 400;
}

.price-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.price-features li {
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-light);
}

.price-features li svg {
  color: #38ef7d;
  flex-shrink: 0;
}

/* 教程/客户端浮动表 Tutorial Section */
.tutorial-section {
  padding: 80px 0;
  background: rgba(15, 10, 32, 0.5);
}

.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

.tutorial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px;
  backdrop-filter: blur(10px);
  text-align: center;
}

.tutorial-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 20px auto;
  background: rgba(138, 43, 226, 0.2);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #e9d5ff;
}

.tutorial-card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}

.tutorial-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.6;
}

/* 特性区 Features Section */
.features-section {
  padding: 100px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.feature-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: var(--transition);
}

.feature-box:hover {
  background: var(--bg-card-hover);
  border-color: rgba(168, 85, 247, 0.4);
  transform: translateY(-5px);
}

.feature-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.2), rgba(138, 43, 226, 0.2));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--cyan-accent);
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-desc {
  font-size: 15px;
  color: var(--text-muted);
}

/* SEO文章区 Articles Matrix Section */
.articles-section {
  padding: 100px 0;
  background: rgba(11, 7, 24, 0.6);
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article-card:hover {
  border-color: rgba(236, 72, 153, 0.5);
  transform: translateY(-5px);
}

.article-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(138, 43, 226, 0.2);
  color: #c084fc;
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 14px;
}

.article-title {
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 12px;
}

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

.article-title a:hover {
  color: #ff007f;
}

.article-excerpt {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.7;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: #64748b;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

/* 用户评价 User Reviews */
.reviews-section {
  padding: 100px 0;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
}

.review-stars {
  color: var(--gold-primary);
  margin-bottom: 12px;
  font-size: 16px;
}

.review-text {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 20px;
  font-style: italic;
  line-height: 1.7;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #00f2fe, #4facfe);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #000;
}

.user-details h4 {
  font-size: 15px;
  font-weight: 700;
}

.user-details span {
  font-size: 13px;
  color: var(--text-muted);
}

/* 常见问题 FAQ Section */
.faq-section {
  padding: 100px 0;
  background: rgba(14, 9, 30, 0.5);
}

.faq-list {
  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: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 22px 28px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-icon {
  font-size: 20px;
  transition: transform 0.3s ease;
  color: var(--gold-primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  padding: 0 28px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
  transition: all 0.3s ease-out;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 28px 22px 28px;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

/* CTA 终极召唤区 */
.cta-banner {
  padding: 80px 0;
  margin: 60px 0;
  background: linear-gradient(135deg, rgba(138, 43, 226, 0.3) 0%, rgba(255, 0, 127, 0.2) 100%);
  border-top: 1px solid rgba(168, 85, 247, 0.3);
  border-bottom: 1px solid rgba(168, 85, 247, 0.3);
  text-align: center;
}

/* 核心页脚 PBN 权重传输管道 Footer & PBN Links Section */
.footer {
  background: #06040d;
  border-top: 1px solid rgba(168, 85, 247, 0.15);
  padding: 60px 0 30px 0;
  color: var(--text-muted);
  font-size: 14px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  line-height: 1.7;
}

.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 18px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition);
}

.footer-col ul a:hover {
  color: #ff007f;
}

/* 友情链接及PBN安全融入区 - 低调小字号 */
.pbn-links-area {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  margin-top: 30px;
  text-align: center;
}

.pbn-title {
  font-size: 12px;
  color: #64748b;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.pbn-links-list {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.pbn-link {
  color: #71717a;
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s ease;
}

.pbn-link:hover {
  color: var(--gold-primary);
  text-decoration: underline;
}

.footer-bottom {
  text-align: center;
  margin-top: 20px;
  font-size: 13px;
  color: #52525b;
}

/* 文章页面专项样式 Article Detail Page Styles */
.article-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 160px 20px 80px 20px;
}

.article-header {
  margin-bottom: 40px;
  text-align: center;
}

.article-header-meta {
  display: flex;
  justify-content: center;
  gap: 20px;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 16px;
}

.article-body {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 45px;
  backdrop-filter: blur(12px);
  line-height: 2;
  font-size: 16px;
  color: #e2e8f0;
}

.article-body h2 {
  font-size: 26px;
  color: var(--gold-primary);
  margin: 36px 0 18px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 193, 7, 0.2);
}

.article-body h3 {
  font-size: 20px;
  color: #ffffff;
  margin: 28px 0 14px 0;
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 0 0 20px 24px;
}

.article-body li {
  margin-bottom: 8px;
}

.article-cta-box {
  background: linear-gradient(135deg, rgba(138, 43, 226, 0.25), rgba(255, 0, 127, 0.25));
  border: 1px solid rgba(236, 72, 153, 0.4);
  border-radius: var(--radius-md);
  padding: 30px;
  text-align: center;
  margin: 40px 0;
}

.internal-nav {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.internal-nav a {
  color: var(--cyan-accent);
  text-decoration: none;
  font-size: 15px;
}

.internal-nav a:hover {
  text-decoration: underline;
}

/* 响应式适配 Responsive */
@media (max-width: 768px) {
  .hero-title {
    font-size: 34px;
  }
  .nav-links {
    display: none;
  }
  .article-body {
    padding: 24px;
  }
  .stats-bar {
    grid-template-columns: 1fr 1fr;
  }
}