/* ==========================================================================
   飞鸟机场 FlyingBird - 极简白细字风 CSS 样式系统
   - 核心风格：纯白底色、细字体排版 (Thin/Light Typography)、网格卡片边框、发光灵动线条
   - 参考设计：flyingbird.dev 极简架构
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@200;300;400;500;600&family=Noto+Sans+SC:wght@200;300;400;500&display=swap');

:root {
  --bg-main: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-accent: #0ea5e9; /* 灵动青/蓝发光色 */
  --text-accent-glow: rgba(14, 165, 233, 0.15);
  
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --border-active: #0ea5e9;
  
  --font-main: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --max-width: 1200px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.2);
}

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

html {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 300;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  overflow-x: hidden;
  position: relative;
  background: var(--bg-main);
}

/* 灵动发光横线动画点缀 */
.glowing-line {
  position: relative;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--border-color) 20%, var(--border-color) 80%, transparent 100%);
  overflow: hidden;
  margin: 0 auto;
}

.glowing-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100px;
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--text-accent), transparent);
  box-shadow: 0 0 10px var(--text-accent), 0 0 20px var(--text-accent);
  animation: glowScan 4s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

@keyframes glowScan {
  0% { left: -120px; }
  50% { left: 100%; }
  100% { left: 100%; }
}

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

/* 顶部导航 */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 300;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--text-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 400;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 300;
  transition: color 0.2s ease;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 400;
  text-decoration: none;
  transition: all 0.25s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--text-primary);
  color: #ffffff;
  border-color: var(--text-primary);
}

.btn-primary:hover {
  background-color: #1e293b;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.15);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-outline:hover {
  border-color: var(--text-primary);
  background-color: var(--bg-secondary);
}

.btn-glow {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.btn-glow::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-glow);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn-glow:hover::after {
  opacity: 1;
}

/* 移动端导航菜单 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-primary);
}

/* 1. HERO 首屏 (左右分布) */
.hero {
  padding: 80px 0 60px;
  position: relative;
  background: radial-gradient(circle at 80% 20%, rgba(14, 165, 233, 0.04) 0%, transparent 60%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

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

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 0.8125rem;
  color: var(--text-accent);
  margin-bottom: 24px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 400;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background-color: var(--text-accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--text-accent);
}

.hero-title {
  font-size: 3rem;
  font-weight: 200;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero-title span {
  font-weight: 400;
  display: block;
  background: linear-gradient(135deg, #0f172a 0%, #334155 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  font-weight: 300;
  margin-bottom: 36px;
  max-width: 540px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-features {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.feature-mini {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.feature-mini svg {
  width: 18px;
  height: 18px;
  color: var(--text-accent);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual-card {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  position: relative;
}

.hero-visual-card img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* 2. 品牌六维矩阵（参考切图黑白框架） */
.brand-matrix-section {
  padding: 80px 0;
  background-color: var(--bg-secondary);
}

.section-header {
  text-align: left;
  margin-bottom: 48px;
}

.section-tag {
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-accent);
  margin-bottom: 8px;
  font-weight: 500;
}

.section-title {
  font-size: 2rem;
  font-weight: 200;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 300;
}

.grid-matrix {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--border-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.matrix-card {
  background-color: var(--bg-card);
  padding: 36px 28px;
  transition: background-color 0.25s ease;
}

.matrix-card:hover {
  background-color: var(--bg-hover);
}

.matrix-tag {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-accent);
  margin-bottom: 16px;
  font-weight: 500;
}

.matrix-title {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.matrix-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 300;
}

/* 3. 核心功能与专线节点优势 */
.features-section {
  padding: 90px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-box {
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-box:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  width: 44px;
  height: 44px;
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.feature-box h3 {
  font-size: 1.125rem;
  font-weight: 400;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-box p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 300;
}

/* 4. 套餐价格卡片 */
.pricing-section {
  padding: 90px 0;
  background-color: var(--bg-secondary);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.price-card.popular {
  border-color: var(--text-primary);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}

.popular-badge {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--text-primary);
  color: #fff;
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 12px;
  font-weight: 400;
  letter-spacing: 0.05em;
}

.price-name {
  font-size: 1.125rem;
  font-weight: 400;
  margin-bottom: 8px;
}

.price-desc {
  font-size: 0.8125rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  height: 38px;
}

.price-val {
  font-size: 2.25rem;
  font-weight: 300;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.price-val span {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 300;
}

.price-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.price-features li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  padding: 8px 0;
  border-bottom: 1px dashed var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.price-features li svg {
  width: 16px;
  height: 16px;
  color: var(--text-accent);
}

/* 5. Clash & Clash Party 快速教程与客户端 */
.tutorial-preview-section {
  padding: 90px 0;
}

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

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 24px;
}

.step-num {
  font-size: 2rem;
  font-weight: 200;
  color: var(--text-accent);
  margin-bottom: 12px;
}

.step-card h3 {
  font-size: 1.125rem;
  font-weight: 400;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 6. FAQ 折叠面板 */
.faq-section {
  padding: 90px 0;
  background-color: var(--bg-secondary);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: none;
  border: none;
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  display: none;
}

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

.faq-icon {
  transition: transform 0.3s ease;
}

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

/* 7. SEO 文章目录 */
.articles-section {
  padding: 90px 0;
}

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

.article-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  border-color: var(--border-active);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.article-tag {
  font-size: 0.75rem;
  color: var(--text-accent);
  text-transform: uppercase;
  margin-bottom: 12px;
  letter-spacing: 0.05em;
}

.article-card h3 {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.article-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

/* 8. 文章及教程详情页样式 */
.article-page {
  padding: 60px 0 90px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--text-primary);
}

.article-header {
  margin-bottom: 40px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 32px;
}

.article-header h1 {
  font-size: 2.25rem;
  font-weight: 300;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.article-info {
  display: flex;
  gap: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.article-body {
  max-width: 820px;
  margin: 0 auto;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--text-primary);
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-light);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--text-primary);
  margin: 28px 0 12px;
}

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

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

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

.article-body blockquote {
  border-left: 3px solid var(--text-accent);
  padding: 16px 20px;
  background: var(--bg-secondary);
  margin: 24px 0;
  font-style: italic;
}

.article-body code {
  background: var(--bg-secondary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9em;
}

.cta-banner {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 40px;
  text-align: center;
  margin: 48px 0;
}

.cta-banner h3 {
  font-size: 1.5rem;
  font-weight: 300;
  margin-bottom: 12px;
}

.cta-banner p {
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* 页脚 Footer */
.footer {
  background: var(--bg-main);
  border-top: 1px solid var(--border-color);
  padding: 70px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 16px;
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h4 {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 12px;
}

.footer-col a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* 响应式断点适配 */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .grid-matrix {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.25rem;
  }
  .nav-links {
    display: none;
  }
  .menu-toggle {
    display: block;
  }
  .grid-matrix {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}