/* 菜单式导航（P-MK-28）：独立成文件，首页（自带内联基础样式）也引用，避免重复与缓存冲突 */
.nav-links { display: flex; gap: 24px; list-style: none; }
.nav-links > li { position: relative; }
.nav-links > li > a { color: var(--text-secondary); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.3s; display: inline-flex; align-items: center; gap: 5px; padding: 6px 0; }
.nav-links > li > a:hover, .nav-links > li:hover > a { color: var(--cyan); }
.nav-links > li > a .caret { width: 0; height: 0; border-left: 4px solid transparent; border-right: 4px solid transparent; border-top: 5px solid currentColor; opacity: .6; transition: transform .25s; }
.nav-links > li:hover .caret { transform: rotate(180deg); }
.nav-caret { font-size: 10px; opacity: .6; }

/* 二级菜单：菜单式信息架构（P-MK-28）。桌面 hover / 移动端点击展开。 */
.submenu {
  position: absolute; left: -14px; top: 100%; min-width: 268px;
  background: #1b2334; border: 1px solid var(--border); border-radius: 12px;
  padding: 8px; opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity .22s, transform .22s, visibility .22s;
  box-shadow: 0 18px 48px rgba(0,0,0,.45); z-index: 120;
}
.nav-links > li:hover .submenu, .nav-links > li:focus-within .submenu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.submenu-head {
  font-size: 11px; color: var(--text-muted); letter-spacing: 1.5px;
  padding: 8px 14px 6px; text-transform: uppercase;
}
.submenu a {
  display: block; padding: 9px 14px; border-radius: 8px;
  color: var(--text-secondary); text-decoration: none; font-size: 14px;
  transition: background .2s, color .2s;
}
.submenu a:hover { background: rgba(0,212,255,.10); color: var(--cyan); }
.submenu a .sub-t { display: block; font-size: 14px; color: var(--text-primary); font-weight: 500; margin-bottom: 2px; }
.submenu a .sub-t:hover { color: var(--cyan); }
.submenu a .sub-d { display: block; font-size: 12px; color: var(--text-muted); line-height: 1.55; }
.submenu a:hover .sub-t { color: var(--cyan); }
.submenu .sub-all { border-top: 1px solid var(--border); margin-top: 6px; padding-top: 6px; }

/* 移动端汉堡菜单 */
.nav-toggle { display: none; }
@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 42px; height: 38px; background: transparent; border: 1px solid var(--border);
    border-radius: 8px; cursor: pointer; padding: 0 11px;
  }
  .nav-toggle span { display: block; height: 2px; background: var(--text-primary); border-radius: 2px; transition: transform .25s, opacity .25s; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: rgba(18,24,38,.98); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border); flex-direction: column; gap: 0;
    padding: 10px 24px 18px; max-height: calc(100vh - 64px); overflow-y: auto;
  }
  .nav-links.open { display: flex; }
  .nav-links > li { border-bottom: 1px solid rgba(255,255,255,.07); }
  .nav-links > li > a { width: 100%; padding: 13px 0; font-size: 15px; justify-content: space-between; }
  .submenu {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; background: rgba(255,255,255,.03); border: 1px solid var(--border);
    border-radius: 10px; margin: 0 0 10px; min-width: 0; display: none;
  }
  .nav-links > li.open .submenu { display: block; }
  .nav-links > li:hover .submenu { transform: none; }
}
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; border-radius: 8px; font-size: 14px; font-weight: 600; text-decoration: none; cursor: pointer; border: none; transition: all 0.3s; }
.btn-primary { background: var(--gradient-cyan-purple); color: #fff; box-shadow: var(--glow-cyan); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,212,255,0.35); }
.btn-outline { background: transparent; color: var(--cyan); border: 1px solid var(--cyan); }
.btn-outline:hover { background: rgba(0,212,255,0.1); transform: translateY(-2px); }
.btn-large { padding: 14px 32px; font-size: 16px; }

.page-hero { padding: 150px 0 60px; text-align: center; }
.page-hero .tag { display: inline-block; padding: 5px 14px; background: rgba(0,212,255,0.1); border: 1px solid rgba(0,212,255,0.2); border-radius: 4px; font-size: 12px; color: var(--cyan); letter-spacing: 2px; margin-bottom: 16px; font-weight: 600; }
.page-hero h1 { font-size: 40px; font-weight: 800; margin-bottom: 18px; line-height: 1.3; }
.page-hero p { font-size: 17px; color: var(--text-secondary); max-width: 800px; margin: 0 auto; line-height: 1.8; }

.section { padding: 60px 0; position: relative; }
.section-header { margin-bottom: 36px; }
.section-tag { display: inline-block; padding: 5px 14px; background: rgba(0,212,255,0.1); border: 1px solid rgba(0,212,255,0.2); border-radius: 4px; font-size: 12px; color: var(--cyan); letter-spacing: 2px; margin-bottom: 14px; font-weight: 600; }
.section-title { font-size: 30px; font-weight: 700; margin-bottom: 12px; line-height: 1.3; }
.section-desc { font-size: 16px; color: var(--text-secondary); max-width: 800px; line-height: 1.8; }

.sol-card, .res-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 30px 26px; margin-bottom: 20px; color: var(--text-primary); text-decoration: none; }
.sol-card h3, .res-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 6px; color: var(--text-primary); }
.sol-card .aud { display: inline-block; padding: 3px 10px; background: rgba(0,212,255,0.1); color: var(--cyan); border-radius: 4px; font-size: 12px; font-weight: 600; margin-bottom: 14px; }
.sol-card h4, .res-card h4 { font-size: 15px; font-weight: 700; margin: 16px 0 8px; color: var(--text-primary); }
.sol-card p, .res-card p, .res-card li { font-size: 14px; color: var(--text-secondary); line-height: 1.9; }
.sol-card ul, .res-card ul { margin: 6px 0 0 18px; }
.sol-card .cta-row { margin-top: 18px; display: flex; gap: 12px; flex-wrap: wrap; }

.faq-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 20px 22px; margin-bottom: 14px; }
.faq-item h4 { font-size: 15px; font-weight: 700; margin-bottom: 8px; color: var(--cyan); }
.faq-item p { font-size: 14px; color: var(--text-secondary); line-height: 1.9; }

.note-box { background: rgba(255,145,0,0.08); border: 1px solid rgba(255,145,0,0.25); border-radius: 12px; padding: 18px 22px; font-size: 13px; color: var(--text-secondary); line-height: 1.9; }

.cta-section { padding: 60px 0; text-align: center; }
.cta-box { background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(123,97,255,0.08)); border: 1px solid rgba(0,212,255,0.25); border-radius: 24px; padding: 46px 36px; }
.cta-box h2 { font-size: 28px; font-weight: 800; margin-bottom: 14px; }
.cta-box p { font-size: 16px; color: var(--text-secondary); margin-bottom: 24px; line-height: 1.8; }
.cta-row { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-phone { margin-top: 20px; font-size: 20px; color: var(--cyan); font-weight: 700; }

.footer { background: var(--bg-secondary); border-top: 1px solid var(--border); padding: 50px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 30px; }
.footer-brand p { font-size: 13px; color: var(--text-muted); line-height: 1.8; margin: 14px 0; }
.footer-contact { font-size: 13px; color: var(--text-secondary); }
.footer-contact .phone { color: var(--cyan); font-weight: 700; font-size: 18px; margin-bottom: 8px; }
.footer-col h4 { font-size: 14px; font-weight: 700; margin-bottom: 14px; color: var(--text-primary); }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { font-size: 13px; color: var(--text-muted); text-decoration: none; transition: color 0.3s; }
.footer-col a:hover { color: var(--cyan); }
.footer-bottom { padding-top: 24px; border-top: 1px solid var(--border); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.footer-bottom p { font-size: 12px; color: var(--text-muted); }

/* 文章阅读区：浅色纸面卡片。原 article-body 深字样式本为浅底设计，
   全站深色主题下需给阅读区独立浅底，否则深字落在深底不可读。 */
.article-wrap{
  background:#ffffff;
  border:1px solid #e6eaf2;
  border-radius:18px;
  padding:46px 52px;
  box-shadow:0 18px 50px rgba(0,0,0,.30);
}