/* roulang page: index */
:root {
  --brand: #2563EB;
  --brand-dark: #1D4ED8;
  --brand-light: #EFF6FF;
  --brand-lighter: #DBEAFE;
  --accent: #0FA3A0;
  --warning: #EAB308;
  --bg-page: #F6F8FB;
  --bg-card: #FFFFFF;
  --deep-blue: #173A5E;
  --text-1: #1F2937;
  --text-2: #4B5563;
  --text-3: #99A5B5;
  --border: #E5EAF0;
  --radius-card: 16px;
  --radius-btn: 12px;
  --shadow-card: 0 2px 8px rgba(37,99,235,0.06), 0 2px 16px rgba(15,23,42,0.04);
  --shadow-hover: 0 12px 32px rgba(37,99,235,0.12), 0 4px 8px rgba(15,23,42,0.06);
}
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  background: var(--bg-page);
  color: var(--text-1);
  line-height: 1.75;
}
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }
button { cursor: pointer; font-family: inherit; }
.container { max-width: 1280px; margin-left: auto; margin-right: auto; padding-left: 1rem; padding-right: 1rem; }
@media (min-width: 768px) {
  .container { padding-left: 2rem; padding-right: 2rem; }
}
.logo-text {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--brand);
  white-space: nowrap;
  letter-spacing: -0.01em;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  font-weight: 600;
  transition: all 0.2s ease-out;
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
}
.btn-primary {
  background: var(--brand);
  color: #fff;
}
.btn-primary:hover { background: var(--brand-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.18); }
.btn-primary:active { background: #1E40AF; transform: translateY(0); }
.btn-secondary {
  background: #fff;
  color: var(--brand);
  border: 2px solid var(--brand);
}
.btn-secondary:hover { background: var(--brand-light); transform: translateY(-2px); }
.btn-secondary:active { background: var(--brand-lighter); transform: translateY(0); }
.btn-white { background: #fff; color: var(--brand); }
.btn-white:hover { background: var(--brand-light); transform: translateY(-2px); }
.card {
  background: var(--bg-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: all 0.2s ease-out;
}
.card-hover:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--brand);
  background: var(--brand-lighter);
  border-radius: 999px;
  padding: 0.375rem 1rem;
}
.section-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.section-desc {
  color: var(--text-2);
  font-size: 0.9375rem;
  line-height: 1.75;
  max-width: 42rem;
}
/* 导航 tab */
.nav-tab {
  display: inline-flex;
  align-items: center;
  padding: 0.4375rem 1.125rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #4B5563;
  background: transparent;
  transition: all 0.2s ease-out;
}
.nav-tab:hover { background: var(--brand-light); color: var(--brand); }
.nav-tab.active { background: var(--brand); color: #fff; font-weight: 600; }
@media (max-width: 767px) {
  .nav-tab { white-space: nowrap; }
}
/* Hero 背景 */
.hero-bg-layer {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  opacity: 0.35;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, #ffffff 0%, rgba(255,255,255,0.88) 42%, rgba(239,246,255,0.72) 100%);
}
.num-font { font-family: "DIN Alternate","Roboto Mono","SF Mono",monospace; font-feature-settings: "tnum"; }
/* 步骤卡 */
.step-card {
  background: #F4F7FB;
  border-radius: var(--radius-card);
  padding: 1.75rem 1.5rem;
  position: relative;
  transition: all 0.2s ease-out;
}
.step-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.step-num {
  font-size: 2.5rem;
  font-weight: 800;
  color: rgba(37,99,235,0.12);
  line-height: 1;
  display: block;
  margin-bottom: 1rem;
}
/* 奖励卡 */
.bounty-img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: 12px;
  background: #F1F5F9;
}
.bounty-tag {
  display: inline-block;
  background: #FEF3C7;
  color: #B45309;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.1875rem 0.625rem;
  border-radius: 999px;
}
/* 进度条 */
.progress-track {
  background: #E2E8F0;
  border-radius: 999px;
  height: 10px;
  overflow: hidden;
}
.progress-fill {
  background: linear-gradient(90deg, #2563EB 0%, #0FA3A0 100%);
  height: 100%;
  border-radius: 999px;
  width: 50%;
  transition: width 0.8s ease-out;
}
/* 任务行 */
.task-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.task-row:last-child { border-bottom: none; }
.task-done-icon {
  width: 2rem; height: 2rem;
  border-radius: 999px;
  background: rgba(15,163,160,0.12);
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.task-todo-icon {
  width: 2rem; height: 2rem;
  border-radius: 999px;
  border: 2px solid #CBD5E1;
  background: #fff;
  flex-shrink: 0;
}
.task-done { opacity: 0.65; }
.task-done .task-name { text-decoration: line-through; text-decoration-color: rgba(31,41,55,0.3); }
/* FAQ */
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item:first-child { border-top: 1px solid var(--border); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.125rem 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-1);
  background: none;
  border: none;
  width: 100%;
  text-align: left;
}
.faq-question .icon {
  flex-shrink: 0;
  display: inline-flex;
  transition: transform 0.3s ease-out;
  color: var(--brand);
}
.faq-item.open .icon { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
  color: var(--text-2);
  font-size: 0.9375rem;
  line-height: 1.75;
}
.faq-answer-inner { padding: 0 0 1.125rem; }
/* CTA */
.cta-deco {
  position: absolute;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
}
/* 页脚 */
.footer-link { transition: color 0.2s; }
.footer-link:hover { color: #fff; text-decoration: underline; }
/* 移动端抽屉 */
.mobile-menu { max-height: 0; overflow: hidden; transition: max-height 0.35s ease-out; }
.mobile-menu.open { max-height: 360px; }
/* 通用focus */
a:focus-visible, button:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
/* 自定义 hero 渐变文本 */
.gradient-text {
  background: linear-gradient(90deg, #1E40AF 0%, #0FA3A0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
/* 资讯列表行 */
.news-list-row + .news-list-row { border-top: 1px solid var(--border); }
.news-list-row { padding: 0.875rem 0; }

/* roulang page: category1 */
:root {
    --primary: #2563EB;
    --primary-dark: #1D4ED8;
    --primary-deep: #1E40AF;
    --primary-light: #EFF6FF;
    --primary-pale: #DBEAFE;
    --bg: #F6F8FB;
    --card: #FFFFFF;
    --deep: #173A5E;
    --accent: #0FA3A0;
    --warning: #EAB308;
    --text-1: #1F2937;
    --text-2: #4B5563;
    --text-3: #99A5B5;
    --border: #E5EAF0;
    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-full: 9999px;
    --shadow-card: 0 2px 8px rgba(37,99,235,0.06), 0 2px 16px rgba(15,23,42,0.04);
    --shadow-hover: 0 12px 32px rgba(37,99,235,0.12), 0 4px 8px rgba(15,23,42,0.06);
    --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, sans-serif;
  }

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

  html { scroll-behavior: smooth; }

  body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text-1);
    line-height: 1.75;
    -webkit-font-smoothing: antialiased;
  }

  a { color: inherit; text-decoration: none; }
  img { display: block; max-width: 100%; }
  button { font-family: inherit; cursor: pointer; }

  .container {
    max-width: 1280px;
    margin: 0 auto;
    padding-left: 1rem;
    padding-right: 1rem;
  }

  @media (min-width: 768px) {
    .container { padding-left: 2rem; padding-right: 2rem; }
  }

  /* 按钮 */
  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-md);
    transition: all 0.2s ease-out;
    border: 2px solid transparent;
    line-height: 1.4;
  }
  .btn-primary {
    background: var(--primary);
    color: #fff;
  }
  .btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(37,99,235,0.25);
  }
  .btn-primary:active {
    background: var(--primary-deep);
    transform: translateY(0);
  }
  .btn-secondary {
    background: #fff;
    color: var(--primary);
    border-color: var(--primary);
  }
  .btn-secondary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(37,99,235,0.12);
  }
  .btn-secondary:active {
    background: var(--primary-pale);
    transform: translateY(0);
  }

  /* 导航 Tab */
  .nav-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.4375rem 1.125rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-2);
    border-radius: var(--radius-full);
    transition: all 0.2s ease-out;
    white-space: nowrap;
  }
  .nav-tab:hover {
    background: var(--primary-pale);
    color: var(--primary);
  }
  .nav-tab.active {
    background: var(--primary);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(37,99,235,0.3);
  }

  .logo-text {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--primary);
    letter-spacing: -0.01em;
    white-space: nowrap;
  }

  /* 面包屑 */
  .breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8125rem;
    color: var(--text-3);
  }
  .breadcrumb a {
    color: var(--primary);
  }
  .breadcrumb a:hover {
    text-decoration: underline;
  }
  .breadcrumb-sep {
    color: var(--border);
  }

  /* 眉标 */
  .eyebrow {
    display: inline-block;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    font-weight: 600;
    color: var(--primary);
    background: var(--primary-pale);
    padding: 0.3125rem 0.875rem;
    border-radius: var(--radius-full);
    margin-bottom: 1rem;
  }

  /* 卡片 */
  .info-card {
    background: var(--card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 2rem;
    border: 1px solid rgba(229, 234, 240, 0.6);
    transition: all 0.2s ease-out;
  }
  .info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-pale);
  }

  .icon-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: 0.875rem;
    background: var(--primary-light);
    color: var(--primary);
    margin-bottom: 1.25rem;
  }

  /* 列表 */
  .link-list {
    display: flex;
    flex-direction: column;
  }
  .link-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.125rem 1.25rem;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: all 0.2s ease-out;
    font-weight: 500;
    color: var(--text-1);
  }
  .link-list a:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
    color: var(--primary);
    transform: translateY(-2px);
  }
  .link-list a .arrow {
    color: var(--text-3);
    transition: color 0.2s, transform 0.2s;
    font-size: 1.125rem;
  }
  .link-list a:hover .arrow {
    color: var(--primary);
    transform: translateX(4px);
  }

  /* Footer 链接 */
  .footer-link {
    color: #BFD0E0;
    transition: color 0.2s;
  }
  .footer-link:hover {
    color: #fff;
  }

  /* FAQ */
  .faq-item {
    border-bottom: 1px solid var(--border);
  }
  .faq-item:last-child {
    border-bottom: none;
  }
  .faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-1);
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    transition: color 0.2s;
  }
  .faq-question:hover {
    color: var(--primary);
  }
  .faq-chevron {
    transition: transform 0.2s ease-out;
    color: var(--text-3);
    flex-shrink: 0;
  }
  .faq-item.open .faq-chevron {
    transform: rotate(180deg);
    color: var(--primary);
  }
  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease-out, padding 0.25s ease-out;
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--text-2);
  }
  .faq-item.open .faq-answer {
    max-height: 240px;
    padding-bottom: 1.25rem;
  }

  /* CTA 块 */
  .cta-block {
    background: linear-gradient(135deg, #2563EB 0%, #3B82F6 55%, #60A5FA 100%);
    border-radius: 1.25rem;
    padding: 3.5rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
  }
  .cta-block::before {
    content: "";
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    top: -80px;
    right: -60px;
    pointer-events: none;
  }
  .cta-block::after {
    content: "";
    position: absolute;
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: rgba(255,255,255,0.06);
    bottom: -50px;
    left: -30px;
    pointer-events: none;
  }
  .cta-block .cta-content {
    position: relative;
    z-index: 1;
  }

  /* 聚焦样式 */
  a:focus-visible, button:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
  }

  /* 分段导航容器 */
  .tab-nav {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    background: #F1F5F9;
    border-radius: var(--radius-full);
    padding: 0.25rem;
  }

  /* 分类页 Hero */
  .page-hero {
    background: linear-gradient(135deg, #EFF6FF 0%, #F6F8FB 60%, #FFFFFF 100%);
    border-bottom: 1px solid var(--border);
    position: relative;
  }
  .page-hero .bg-text {
    position: absolute;
    right: 2rem;
    bottom: 1rem;
    font-size: 7rem;
    font-weight: 800;
    color: rgba(37,99,235,0.04);
    line-height: 1;
    pointer-events: none;
    user-select: none;
  }

  /* 移动端抽屉 */
  @media (max-width: 767px) {
    .mobile-drawer {
      position: fixed;
      top: 64px;
      left: 0;
      right: 0;
      background: #fff;
      padding: 1rem 1.25rem 1.5rem;
      box-shadow: 0 16px 40px rgba(15,23,42,0.12);
      border-radius: 0 0 1rem 1rem;
      z-index: 999;
      display: none;
    }
    .mobile-drawer.open {
      display: block;
    }
    .mobile-drawer .tab-nav {
      flex-wrap: nowrap;
      overflow-x: auto;
      padding: 0.5rem;
      border-radius: var(--radius-md);
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
    }
    .mobile-drawer .tab-nav::-webkit-scrollbar {
      display: none;
    }
    .mobile-drawer .nav-tab {
      flex-shrink: 0;
    }
  }

  /* 桌面导航 */
  @media (min-width: 768px) {
    .nav-tab {
      padding: 0.5rem 1.5rem;
      font-size: 0.9375rem;
    }
  }

/* roulang page: article */
:root {
  --primary: #2563EB;
  --primary-dark: #1D4ED8;
  --primary-darker: #1E40AF;
  --primary-light: #EFF6FF;
  --primary-lighter: #DBEAFE;
  --accent: #0FA3A0;
  --warning: #EAB308;
  --navy: #173A5E;
  --ink: #1F2937;
  --ink-2: #4B5563;
  --ink-3: #99A5B5;
  --line: #E5EAF0;
  --bg: #F6F8FB;
  --radius: 16px;
  --radius-btn: 12px;
  --shadow-card: 0 2px 8px rgba(37,99,235,0.06), 0 2px 16px rgba(15,23,42,0.04);
  --shadow-hover: 0 12px 32px rgba(37,99,235,0.12), 0 4px 8px rgba(15,23,42,0.06);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  background-color: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }
.container {
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1rem;
  padding-right: 1rem;
}
@media (min-width: 768px) {
  .container { padding-left: 2rem; padding-right: 2rem; }
}
.logo-text {
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: 1.25rem;
  line-height: 1.2;
  color: var(--primary);
  white-space: nowrap;
}
@media (max-width: 640px) {
  .logo-text { font-size: 1.05rem; letter-spacing: -0.02em; }
}
.nav-tab {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.25rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #4B5563;
  white-space: nowrap;
  transition: background-color .2s ease, color .2s ease;
}
.nav-tab:hover { background: #DBEAFE; color: #2563EB; }
.nav-tab.active { background: #2563EB; color: #fff; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #2563EB;
  color: #fff;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  gap: 0.5rem;
  transition: background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.btn-primary:hover { background: #1D4ED8; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(37,99,235,0.25); }
.btn-primary:active { background: #1E40AF; transform: translateY(0); }
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: #2563EB;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  border: 2px solid #2563EB;
  gap: 0.5rem;
  transition: background-color .2s ease, transform .2s ease;
}
.btn-secondary:hover { background: #EFF6FF; transform: translateY(-2px); }
.btn-secondary:active { transform: translateY(0); }
.btn-white {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  color: #2563EB;
  font-size: 0.9375rem;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border-radius: 12px;
  gap: 0.5rem;
  transition: background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.btn-white:hover { background: #EFF6FF; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(255,255,255,.2); }
.card {
  background: #fff;
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.375rem 0.875rem;
  background: #EFF6FF;
  color: #2563EB;
  font-size: 0.8125rem;
  border-radius: 9999px;
  transition: background-color .2s ease, color .2s ease;
}
.tag:hover { background: #DBEAFE; color: #1D4ED8; }
.article-body {
  font-size: 1rem;
  line-height: 1.85;
  color: #1F2937;
  overflow-wrap: break-word;
}
.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.25rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #E5EAF0;
}
.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.75rem 0 0.75rem;
}
.article-body h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}
.article-body p { margin-bottom: 1.25rem; }
.article-body ul, .article-body ol {
  padding-left: 1.75rem;
  margin-bottom: 1.25rem;
}
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 0.375rem; }
.article-body blockquote {
  border-left: 4px solid #2563EB;
  background: #EFF6FF;
  padding: 1rem 1.25rem;
  border-radius: 0 12px 12px 0;
  margin: 1.75rem 0;
  color: #4B5563;
}
.article-body img { border-radius: 12px; margin: 1.75rem 0; }
.article-body table { width: 100%; border-collapse: collapse; margin: 1.75rem 0; font-size: 0.9375rem; }
.article-body th, .article-body td { border: 1px solid #E5EAF0; padding: 0.75rem 1rem; text-align: left; }
.article-body th { background: #F8FAFC; font-weight: 600; }
.article-body a { color: #2563EB; text-decoration: underline; text-underline-offset: 2px; }
.article-body a:hover { color: #1D4ED8; }
.footer-link { color: #BFD0E0; transition: color .2s ease; }
.footer-link:hover { color: #fff; }
a:focus-visible, button:focus-visible {
  outline: 2px solid #2563EB;
  outline-offset: 2px;
  border-radius: 4px;
}

/* roulang page: category2 */
:root {
            --primary: #2563EB;
            --primary-dark: #1D4ED8;
            --primary-light: #EFF6FF;
            --accent: #0FA3A0;
            --warning: #EAB308;
            --bg: #F6F8FB;
            --card: #FFFFFF;
            --deep: #173A5E;
            --text: #1F2937;
            --text-secondary: #4B5563;
            --text-light: #99A5B5;
            --border: #E5EAF0;
            --radius-card: 16px;
            --radius-btn: 12px;
            --shadow-card: 0 2px 8px rgba(37, 99, 235, 0.06), 0 2px 16px rgba(15, 23, 42, 0.04);
            --shadow-hover: 0 12px 32px rgba(37, 99, 235, 0.12), 0 4px 8px rgba(15, 23, 42, 0.06);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            font-size: 0.9375rem;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }
        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color .2s ease-out;
        }
        img {
            display: block;
            max-width: 100%;
            height: auto;
        }
        .logo-text {
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
            white-space: nowrap;
        }
        .nav-tab {
            display: inline-flex;
            align-items: center;
            padding: 0.5rem 1.1rem;
            border-radius: 9999px;
            font-size: 0.875rem;
            font-weight: 500;
            color: #475569;
            transition: background .2s, color .2s, box-shadow .2s;
        }
        .nav-tab:hover {
            background: #DBEAFE;
            color: var(--primary);
        }
        .nav-tab.active {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.18);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: #fff;
            padding: 0.625rem 1.5rem;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 0.9375rem;
            border: 2px solid transparent;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
            transition: background .2s ease-out, transform .2s ease-out, box-shadow .2s ease-out;
            cursor: pointer;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.28);
        }
        .btn-primary:active {
            background: #1E40AF;
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: #fff;
            color: var(--primary);
            padding: 0.625rem 1.5rem;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 0.9375rem;
            border: 2px solid var(--primary);
            transition: background .2s ease-out, transform .2s ease-out;
            cursor: pointer;
        }
        .btn-outline:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
            background: #DBEAFE;
        }
        .btn-white {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: #fff;
            color: var(--primary);
            padding: 0.75rem 2rem;
            border-radius: 9999px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
            transition: transform .2s ease-out, box-shadow .2s ease-out;
            cursor: pointer;
        }
        .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
        }
        .eyebrow {
            display: inline-block;
            font-size: 0.75rem;
            letter-spacing: 0.15em;
            font-weight: 700;
            color: var(--primary);
            text-transform: uppercase;
            margin-bottom: 0.75rem;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            background: #DBEAFE;
            color: var(--primary);
            border-radius: 9999px;
            padding: 0.3125rem 0.875rem;
            font-size: 0.8125rem;
            font-weight: 600;
        }
        .card {
            background: #fff;
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
            transition: transform .2s ease-out, box-shadow .2s ease-out;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.375rem;
            font-size: 0.8125rem;
            color: var(--text-light);
            margin-bottom: 1rem;
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: #CBD5E1;
        }
        .footer-link {
            color: #BFD0E0;
            transition: color .2s ease-out;
        }
        .footer-link:hover {
            color: #fff;
        }
        .faq-item {
            border-bottom: 1px solid var(--border);
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.25rem 0.25rem;
            background: transparent;
            border: none;
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            transition: color .2s ease-out;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question .chevron {
            flex-shrink: 0;
            width: 18px;
            height: 18px;
            margin-left: 1rem;
            color: var(--text-light);
            transition: transform .2s ease-out, color .2s ease-out;
        }
        .faq-item.faq-open .faq-question .chevron {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .25s ease-out;
        }
        .faq-item.faq-open .faq-answer {
            max-height: 320px;
        }
        .faq-answer-inner {
            padding: 0 0.25rem 1.25rem;
            color: var(--text-secondary);
            font-size: 0.9375rem;
            line-height: 1.75;
        }
        .step-card {
            background: #F4F7FB;
            border-radius: var(--radius-card);
            padding: 1.75rem 1.5rem;
            position: relative;
            border: 1px solid transparent;
            transition: border-color .2s ease-out, transform .2s ease-out;
        }
        .step-card:hover {
            border-color: #DBEAFE;
            transform: translateY(-3px);
        }
        .step-num {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1;
            color: rgba(37, 99, 235, 0.18);
            letter-spacing: -0.03em;
        }
        .feature-list li {
            position: relative;
            padding-left: 1.75rem;
            margin-bottom: 0.625rem;
            color: var(--text-secondary);
        }
        .feature-list li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0.5rem;
            width: 1rem;
            height: 1rem;
            border-radius: 9999px;
            background: var(--accent) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='white' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='3 8 7 12 13 4'/%3E%3C/svg%3E") center/8px no-repeat;
        }
        .mobile-nav-tab {
            display: block;
            padding: 0.625rem 1rem;
            border-radius: 12px;
            font-size: 0.9375rem;
            font-weight: 500;
            color: #475569;
            transition: background .2s, color .2s;
        }
        .mobile-nav-tab:hover {
            background: #F1F5F9;
            color: var(--primary);
        }
        .mobile-nav-tab.active {
            background: var(--primary);
            color: #fff;
        }
        @media (max-width: 767px) {
            .hero-grid {
                grid-template-columns: 1fr;
            }
            .hero-cover {
                display: none;
            }
            .flow-grid {
                grid-template-columns: 1fr;
            }
            .security-grid {
                grid-template-columns: 1fr;
            }
            .faq-question {
                font-size: 0.9375rem;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
            .btn-primary,
            .btn-outline {
                padding: 0.5rem 1.125rem;
                font-size: 0.875rem;
            }
        }