/* 青云梯机场 (Qingyunti.baby) - 简洁科技风青绿色视觉系统 */
:root {
  --primary: #00c897;
  --primary-hover: #00e0a8;
  --primary-glow: rgba(0, 200, 151, 0.35);
  --secondary: #00b4d8;
  --accent: #00f5d4;
  --bg-dark: #070d14;
  --bg-card: rgba(15, 25, 38, 0.75);
  --bg-card-hover: rgba(22, 36, 54, 0.85);
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-bright: #ffffff;
  --border-color: rgba(0, 200, 151, 0.2);
  --border-highlight: rgba(0, 200, 151, 0.6);
  --font-kaiti: "STKaiti", "楷体", "KaiTi", "Noto Serif SC", "FZKai-Z03S", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --shadow-glow: 0 8px 32px 0 rgba(0, 200, 151, 0.25);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-kaiti);
  line-height: 1.8;
  overflow-x: hidden;
  position: relative;
  font-size: 17px;
}

/* 动态背景 Canvas */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* 链接基础样式 */
a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--accent);
  text-shadow: 0 0 8px var(--primary-glow);
}

/* 容器限制 */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & 导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(7, 13, 20, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 76px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: bold;
  color: #fff;
  letter-spacing: 1px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.4rem;
  box-shadow: 0 0 15px var(--primary-glow);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  font-size: 1.02rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 6px;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent);
  background: rgba(0, 200, 151, 0.12);
}

.nav-cta {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff !important;
  padding: 10px 24px;
  border-radius: 30px;
  font-weight: bold;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 200, 151, 0.5);
}

/* 移动端菜单切换按钮 */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.8rem;
  cursor: pointer;
}

/* Hero 板块 */
.hero {
  padding: 150px 0 90px;
  text-align: center;
  position: relative;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 200, 151, 0.12);
  border: 1px solid var(--border-highlight);
  color: var(--accent);
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 0.95rem;
  margin-bottom: 24px;
  animation: pulseGlow 2.5s infinite;
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 10px rgba(0,200,151,0.2); }
  50% { box-shadow: 0 0 22px rgba(0,200,151,0.5); }
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 840px;
  margin: 0 auto 40px;
  line-height: 1.8;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #00b4d8);
  color: #fff;
  padding: 16px 40px;
  border-radius: 35px;
  font-size: 1.15rem;
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 6px 25px var(--primary-glow);
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 10px 30px rgba(0, 200, 151, 0.6);
  color: #fff;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 16px 36px;
  border-radius: 35px;
  font-size: 1.15rem;
  font-weight: bold;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: rgba(0, 200, 151, 0.15);
  border-color: var(--primary);
  color: #fff;
}

/* 实时状态面板 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: 16px;
  backdrop-filter: blur(12px);
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
}

.stat-number {
  font-size: 2.2rem;
  font-weight: bold;
  color: var(--accent);
  margin-bottom: 6px;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* 板块通用标题 */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-subtitle {
  color: var(--primary);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: bold;
  margin-bottom: 8px;
  display: block;
}

.section-title {
  font-size: 2.4rem;
  font-weight: bold;
  color: #fff;
}

.section-title span {
  color: var(--primary);
}

/* 核心优势板块 */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 36px 28px;
  border-radius: 20px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.adv-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: var(--transition);
}

.adv-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-highlight);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 30px rgba(0,0,0,0.4);
}

.adv-card:hover::before {
  opacity: 1;
}

.adv-icon {
  width: 60px;
  height: 60px;
  background: rgba(0, 200, 151, 0.1);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--accent);
  margin-bottom: 20px;
  border: 1px solid rgba(0, 200, 151, 0.2);
}

.adv-card h3 {
  font-size: 1.35rem;
  color: #fff;
  margin-bottom: 12px;
}

.adv-card p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
}

/* 套餐价格板块（精确参照用户参考图片样式与价格） */
.pricing-section {
  background: linear-gradient(180deg, rgba(7,13,20,0) 0%, rgba(0,200,151,0.03) 50%, rgba(7,13,20,0) 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: center;
}

.pricing-card {
  background: #ffffff;
  border-radius: 16px;
  padding: 40px 30px;
  text-align: center;
  color: #333333;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  transition: var(--transition);
  position: relative;
  font-family: var(--font-sans);
}

.pricing-card.popular {
  border: 2px solid #00c897;
  transform: scale(1.05);
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(0, 200, 151, 0.2);
}

.pricing-card.popular:hover {
  transform: scale(1.05) translateY(-8px);
}

.pricing-header h3 {
  font-size: 1.4rem;
  color: #2d3748;
  font-weight: 700;
  margin-bottom: 20px;
}

.pricing-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: #1a202c;
  margin-bottom: 25px;
}

.pricing-price span {
  font-size: 1rem;
  color: #718096;
  font-weight: normal;
}

.pricing-features {
  list-style: none;
  margin-bottom: 35px;
  text-align: center;
}

.pricing-features li {
  padding: 12px 0;
  border-top: 1px solid #edf2f7;
  font-size: 0.95rem;
  color: #4a5568;
}

.pricing-btn {
  display: inline-block;
  width: 100%;
  padding: 12px 0;
  border: 1px solid #00c897;
  color: #00c897;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: bold;
  transition: var(--transition);
  background: transparent;
}

.pricing-card.popular .pricing-btn {
  background: #00c897;
  color: #ffffff;
}

.pricing-btn:hover {
  background: #00c897;
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(0, 200, 151, 0.4);
}

/* 使用教程板块 */
.tutorial-tabs {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 12px 28px;
  border-radius: 30px;
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font-kaiti);
  font-weight: bold;
  transition: var(--transition);
}

.tab-btn:hover, .tab-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 15px var(--primary-glow);
}

.tutorial-content {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 40px;
}

.tutorial-content.active {
  display: block;
  animation: fadeIn 0.4s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-item {
  background: rgba(7, 13, 20, 0.6);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 24px;
}

.step-number {
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-bottom: 16px;
}

.step-item h4 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 10px;
}

.step-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* 知识库板块 (14篇SEO长文卡片) */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

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

.article-meta {
  display: flex;
  justify-content: space-between;
  color: var(--primary);
  font-size: 0.85rem;
  margin-bottom: 12px;
}

.article-title {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.5;
}

.article-summary {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.article-read-btn {
  background: rgba(0, 200, 151, 0.1);
  color: var(--accent);
  border: 1px solid var(--border-highlight);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  font-family: var(--font-kaiti);
  text-align: center;
  transition: var(--transition);
}

.article-read-btn:hover {
  background: var(--primary);
  color: #fff;
}

/* 文章 Modal 弹窗阅读器全套细节 */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(12px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-container {
  background: #0d1622;
  border: 1px solid var(--border-highlight);
  border-radius: 20px;
  max-width: 920px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  padding: 40px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.85);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 25px;
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--primary);
}

.modal-body {
  color: #e2e8f0;
  font-size: 1.05rem;
  line-height: 1.85;
}

.modal-body h2 {
  color: var(--accent);
  font-size: 1.55rem;
  margin: 30px 0 16px;
  border-bottom: 1px dashed rgba(0, 200, 151, 0.25);
  padding-bottom: 8px;
}

.modal-body h3 {
  color: var(--primary);
  font-size: 1.25rem;
  margin: 22px 0 12px;
}

.modal-body p {
  margin-bottom: 18px;
  color: #cbd5e1;
}

.modal-body ul, .modal-body ol {
  margin-bottom: 22px;
  padding-left: 26px;
}

.modal-body li {
  margin-bottom: 10px;
  color: #cbd5e1;
}

.modal-body code {
  background: rgba(0, 200, 151, 0.12);
  color: var(--accent);
  padding: 3px 8px;
  border-radius: 5px;
  font-family: monospace;
  font-size: 0.95rem;
}

.modal-body pre {
  background: #050a10;
  border: 1px solid var(--border-color);
  padding: 18px;
  border-radius: 12px;
  overflow-x: auto;
  margin-bottom: 22px;
}

.modal-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.modal-body th, .modal-body td {
  padding: 12px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  text-align: left;
}

.modal-body th {
  background: rgba(0, 200, 151, 0.15);
  color: var(--primary);
}

/* FAQ 常见问题折叠面板 */
.faq-grid {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  overflow: hidden;
  transition: var(--transition);
}

.faq-question {
  padding: 20px 24px;
  font-size: 1.15rem;
  color: #fff;
  font-weight: bold;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding: 0 24px 20px;
  color: var(--text-muted);
  display: none;
  font-size: 1rem;
  line-height: 1.7;
}

.faq-item.active {
  border-color: var(--primary);
}

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

/* 用户评价板块 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
}

.review-stars {
  color: #ffb703;
  margin-bottom: 12px;
}

.review-text {
  color: var(--text-main);
  font-size: 1rem;
  margin-bottom: 18px;
  line-height: 1.7;
}

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

.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: bold;
}

.author-info h4 {
  color: #fff;
  font-size: 1rem;
}

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

/* 60个SEO核心关键词板块 (SEO Footprint Grid) */
.seo-keywords-section {
  background: rgba(0,0,0,0.4);
  border-top: 1px solid var(--border-color);
  padding: 60px 0;
}

.keywords-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.keyword-tag {
  background: rgba(15, 25, 38, 0.8);
  border: 1px solid rgba(0, 200, 151, 0.15);
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  transition: var(--transition);
}

.keyword-tag:hover {
  color: var(--accent);
  border-color: var(--primary);
  background: rgba(0, 200, 151, 0.1);
}

/* 页脚 Footer */
.footer {
  background: #04080e;
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

/* 响应式自适应 (Mobile & Tablet) */
@media (max-width: 1024px) {
  .advantages-grid, .pricing-grid, .kb-grid, .reviews-grid, .steps-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.popular {
    transform: none;
  }
  .hero-title {
    font-size: 2.6rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 76px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 76px);
    background: #070d14;
    flex-direction: column;
    padding: 40px 20px;
    transition: var(--transition);
  }

  .nav-menu.active {
    left: 0;
  }

  .mobile-menu-btn {
    display: block;
  }

  .advantages-grid, .pricing-grid, .kb-grid, .reviews-grid, .steps-list, .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2.1rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .modal-container {
    padding: 24px;
  }
}