/* 赔钱机场 - 品牌硬朗设计系统 CSS */
:root {
  /* 背景色在建站时选定并固定：#F7F9FC (浅灰蓝)，全站及刷新、部署均固定不变 */
  --bg-color: #F7F9FC;
  --surface-color: #FFFFFF;
  --surface-subtle: #F1F5F9;
  
  /* 边框与分隔线 */
  --border-color: #CBD5E1;
  --border-dark: #0F172A;
  --border-active: #1E3A8A;

  /* 文字颜色 - 高对比度 */
  --text-main: #0F172A;     /* 对比度 > 12:1 */
  --text-muted: #475569;    /* 对比度 > 6:1 */
  --text-inverse: #FFFFFF;

  /* 按钮与高亮 */
  --btn-primary-bg: #1E3A8A;
  --btn-primary-hover: #1D4ED8;
  --btn-primary-active: #1E40AF;
  --btn-primary-text: #FFFFFF;

  --btn-secondary-bg: #FFFFFF;
  --btn-secondary-border: #1E3A8A;
  --btn-secondary-text: #1E3A8A;
  --btn-secondary-hover: #EFF6FF;

  --accent-tag-bg: #DBEAFE;
  --accent-tag-text: #1E40AF;
  --accent-featured: #0284C7;

  /* 字体与字号 */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  
  /* 硬朗微小圆角 (0-4px) */
  --radius-none: 0px;
  --radius-sm: 2px;
  --radius-md: 4px;

  /* 阴影：禁用柔和扩散阴影，采用硬边微阴影或纯边框 */
  --shadow-block: 3px 3px 0px #0F172A;
  --shadow-hover: 5px 5px 0px #0F172A;

  /* 通用最大宽度 */
  --max-width: 1200px;
  --max-article-width: 840px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-family);
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 无障碍焦点 */
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid var(--btn-primary-bg);
  outline-offset: 3px;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.article-container {
  width: 100%;
  max-width: var(--max-article-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 页眉与导航 */
.site-header {
  background-color: var(--surface-color);
  border-bottom: 2px solid var(--border-dark);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.brand-badge {
  background-color: var(--btn-primary-bg);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.nav-link:hover {
  background-color: var(--surface-subtle);
  border-color: var(--border-dark);
}

.nav-btn {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--border-dark);
  box-shadow: 2px 2px 0px var(--border-dark);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
}

.nav-btn:hover {
  background-color: var(--btn-primary-hover);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--border-dark);
}

.nav-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--border-dark);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
  display: none;
  background: var(--surface-color);
  border: 2px solid var(--border-dark);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
}

/* 主视觉 Hero 区域 */
.hero-section {
  padding: 4rem 0 3.5rem;
  border-bottom: 2px solid var(--border-dark);
  background-color: var(--surface-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: center;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
  color: var(--text-main);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  font-weight: 500;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* 硬朗风格按钮 */
.btn-primary {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-block);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.15s ease;
}

.btn-primary:hover {
  background-color: var(--btn-primary-hover);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.btn-primary:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--border-dark);
}

.btn-secondary {
  background-color: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  font-weight: 700;
  font-size: 1.05rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-block);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, background-color 0.15s ease;
}

.btn-secondary:hover {
  background-color: var(--btn-secondary-hover);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.btn-secondary:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--border-dark);
}

/* 几何信息框 */
.hero-card {
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  box-shadow: var(--shadow-block);
  padding: 1.75rem;
  border-radius: var(--radius-md);
}

.hero-card-header {
  border-bottom: 2px solid var(--border-dark);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.hero-card-title {
  font-size: 1.1rem;
  font-weight: 800;
}

.status-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background-color: #10B981;
  border-radius: 50%;
  margin-right: 6px;
}

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

.stat-box {
  border: 1px solid var(--border-color);
  background-color: var(--bg-color);
  padding: 1rem;
  border-radius: var(--radius-sm);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
}

.stat-value {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--text-main);
  margin-top: 0.25rem;
}

/* 通用章节规范 */
.section {
  padding: 4rem 0;
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 2.5rem;
}

.section-tag {
  display: inline-block;
  background-color: var(--accent-tag-bg);
  color: var(--accent-tag-text);
  font-weight: 800;
  font-size: 0.8rem;
  padding: 4px 10px;
  border: 1px solid var(--border-dark);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}

.section-title {
  font-size: 2rem;
  font-weight: 900;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* 核心优势 (3 个编号信息区) */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.advantage-card {
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  padding: 2rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-block);
  position: relative;
}

.advantage-num {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--btn-primary-bg);
  line-height: 1;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--border-dark);
}

.advantage-title {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.advantage-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 流媒体与 AI 支持 */
.support-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.support-item {
  background-color: var(--surface-color);
  border: 1px solid var(--border-dark);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: 2px 2px 0px var(--border-dark);
}

.support-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-color);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--btn-primary-bg);
}

.support-info-title {
  font-weight: 800;
  font-size: 1rem;
}

.support-info-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.support-disclaimer {
  margin-top: 1.5rem;
  background-color: var(--surface-color);
  border: 1px dashed var(--border-dark);
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
}

/* 套餐对比区域 */
.plans-filter {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.cycle-btn {
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-height: 44px;
  transition: all 0.15s ease;
}

.cycle-btn.active, .cycle-btn:hover {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: 2px 2px 0px var(--border-dark);
}

.plans-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
  align-items: stretch;
}

.plan-card {
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-block);
  position: relative;
}

.plan-card.featured {
  border: 3px solid var(--btn-primary-bg);
  background-color: #FFFFFF;
}

.plan-badge {
  position: absolute;
  top: -12px;
  right: 12px;
  background-color: var(--btn-primary-bg);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 8px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-sm);
}

.plan-name {
  font-size: 1.2rem;
  font-weight: 900;
  margin-bottom: 0.5rem;
}

.plan-traffic {
  font-size: 0.9rem;
  color: var(--text-muted);
  font-weight: 700;
  background-color: var(--bg-color);
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 1.25rem;
}

.plan-price-box {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.plan-price {
  font-size: 1.85rem;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  color: var(--text-main);
  line-height: 1.1;
}

.plan-unit {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-left: 2px;
}

.plan-monthly-eq {
  font-size: 0.8rem;
  color: var(--accent-featured);
  font-weight: 700;
  margin-top: 0.25rem;
}

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

.plan-feature-item {
  font-size: 0.875rem;
  color: var(--text-muted);
  padding: 0.4rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.plan-feature-item::before {
  content: "■";
  color: var(--btn-primary-bg);
  font-size: 0.6rem;
}

.plan-btn {
  width: 100%;
  padding: 0.75rem 1rem;
  text-align: center;
  font-size: 0.95rem;
}

.data-notice {
  margin-top: 2rem;
  padding: 1.25rem;
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* 常见问题 (FAQ) */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-sm);
  box-shadow: 2px 2px 0px var(--border-dark);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  padding: 1.25rem 1.5rem;
  text-align: left;
  background: none;
  border: none;
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 48px;
}

.faq-icon {
  font-weight: 900;
  font-size: 1.2rem;
  transition: transform 0.2s ease;
}

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

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  display: none;
  border-top: 1px solid var(--border-color);
  margin-top: 0.5rem;
  padding-top: 1rem;
}

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

/* 页脚 */
.site-footer {
  background-color: var(--surface-color);
  border-top: 2px solid var(--border-dark);
  padding: 3rem 0 2rem;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-link {
  color: var(--text-main);
  font-weight: 700;
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border-dark);
  background-color: var(--bg-color);
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.footer-link:hover {
  background-color: var(--btn-primary-bg);
  color: #FFFFFF;
}

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

/* 知识科普/文章页面样式 */
.page-header {
  padding: 3rem 0 2rem;
  background-color: var(--surface-color);
  border-bottom: 2px solid var(--border-dark);
  margin-bottom: 2.5rem;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.article-card {
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-block);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.article-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hover);
}

.article-card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.article-card-title {
  font-size: 1.35rem;
  font-weight: 900;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  text-decoration: none;
  display: block;
}

.article-card-title:hover {
  color: var(--btn-primary-bg);
}

.article-card-summary {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.article-card-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  color: var(--btn-primary-bg);
  text-decoration: none;
  font-size: 0.9rem;
}

.article-body {
  background-color: var(--surface-color);
  border: 2px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: 2.5rem;
  box-shadow: var(--shadow-block);
  margin-bottom: 3rem;
  line-height: 1.8;
  font-size: 1.05rem;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 900;
  margin: 2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-dark);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin: 1.5rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-callout {
  background-color: var(--bg-color);
  border-left: 4px solid var(--btn-primary-bg);
  border-top: 1px solid var(--border-dark);
  border-right: 1px solid var(--border-dark);
  border-bottom: 1px solid var(--border-dark);
  padding: 1.25rem;
  margin: 1.5rem 0;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
}

.article-ref-box {
  background-color: var(--surface-subtle);
  border: 1px solid var(--border-dark);
  padding: 1rem 1.25rem;
  margin-top: 2rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.plain-text-source {
  font-family: monospace;
  font-weight: 700;
  color: var(--text-main);
  background: #E2E8F0;
  padding: 2px 6px;
  border-radius: 2px;
}

/* 响应式媒体查询 */
@media (max-width: 1024px) {
  .plans-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .advantages-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .support-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
  }
  
  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background-color: var(--surface-color);
    border-bottom: 2px solid var(--border-dark);
    flex-direction: column;
    padding: 1rem;
    gap: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
  }

  .main-nav.show {
    display: flex;
  }

  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .plans-grid {
    grid-template-columns: 1fr;
  }

  .support-grid {
    grid-template-columns: 1fr;
  }

  .article-body {
    padding: 1.5rem;
  }
}

/* 尊重减弱动画设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}