:root{
  --bg-deep:#0A1E3F;
  --bg-blue:#123B6D;
  --accent-lime:#B6FF00;
  --accent-orange:#FF6B00;
  --cloud:#F4F7FB;
  --steel:#293241;
  --water:#E3F2FD;
  --white:#FFFFFF;
  --text-primary:rgba(255,255,255,0.94);
  --text-secondary:rgba(255,255,255,0.68);
  --font-heading:"Noto Sans CJK SC","Alibaba PuHuiTi","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","HarmonyOS Sans",sans-serif;
  --font-data:"SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --header-h:72px;
  --container-max:1280px;
  --container-gutter:clamp(16px,4vw,48px);
  --space-xs:8px;
  --space-sm:16px;
  --space-md:28px;
  --space-lg:48px;
  --space-xl:80px;
  --radius-sm:4px;
  --radius-md:10px;
  --clip-angle:14px;
  --transition-fast:180ms cubic-bezier(0.2,0.7,0.2,1);
  --transition-slow:420ms cubic-bezier(0.16,1,0.3,1);
  --scroll-progress:0;
}
*,
*::before,
*::after{
  box-sizing:border-box;
  margin:0;
  padding:0;
}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}
@media (prefers-reduced-motion:reduce){
  html{
    scroll-behavior:auto;
  }
}
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  background:var(--bg-deep);
  color:var(--text-primary);
  min-height:100vh;
  overflow-x:hidden;
}
img,
svg,
video{
  display:block;
  max-width:100%;
  height:auto;
}
a{
  color:inherit;
  text-decoration:none;
}
button{
  font:inherit;
  border:none;
  background:none;
  color:inherit;
  cursor:pointer;
}
ul,
ol{
  list-style:none;
}
:focus-visible{
  outline:3px solid var(--accent-lime);
  outline-offset:3px;
  border-radius:2px;
}
#main-content{
  min-height:60vh;
}
.visually-hidden{
  position:absolute!important;
  width:1px;
  height:1px;
  overflow:hidden;
  clip-path:inset(50%);
  white-space:nowrap;
}
.content-container{
  width:100%;
  max-width:var(--container-max);
  margin-inline:auto;
  padding-inline:var(--container-gutter);
}
.skip-link{
  position:fixed;
  top:12px;
  left:-200px;
  z-index:9999;
  background:var(--accent-lime);
  color:var(--bg-deep);
  font-weight:800;
  padding:12px 20px;
  border-radius:6px;
  transition:left var(--transition-fast);
}
.skip-link:focus{
  left:12px;
}
/* ---------- 顶部框架式导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:var(--bg-deep);
  border-bottom:1px solid rgba(182,255,0,0.22);
  transition:transform var(--transition-fast),box-shadow var(--transition-fast);
}
.site-header.is-pinned{
  box-shadow:0 10px 30px rgba(4,12,26,0.6);
}
.header-progress{
  position:absolute;
  left:0;
  bottom:-3px;
  height:3px;
  width:calc(var(--scroll-progress)*100%);
  background:linear-gradient(90deg,var(--accent-lime),var(--accent-orange));
  transform-origin:left;
  z-index:2;
  pointer-events:none;
}
.header-inner{
  position:relative;
  display:flex;
  align-items:stretch;
  height:var(--header-h);
  gap:var(--space-md);
}
.brand-block{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
  flex-shrink:0;
}
.brand-mark{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  background:var(--accent-lime);
  color:var(--bg-deep);
  font-family:var(--font-heading);
  font-weight:900;
  font-size:24px;
  clip-path:polygon(0 0,calc(100% - 10px) 0,100% 10px,100% 100%,10px 100%,0 calc(100% - 10px));
}
.brand-title{
  font-family:var(--font-heading);
  font-weight:900;
  font-size:20px;
  line-height:1.1;
  letter-spacing:0.02em;
  white-space:nowrap;
}
.brand-title em{
  display:block;
  font-style:normal;
  font-size:10px;
  font-weight:700;
  letter-spacing:0.2em;
  color:var(--text-secondary);
}
/* 框架式导航：链接用边框线连接成整体 */
.frame-nav{
  display:flex;
  align-items:center;
  gap:0;
  margin-left:auto;
}
.frame-nav::before,
.frame-nav::after{
  content:"";
  width:1px;
  align-self:stretch;
  background:rgba(182,255,0,0.25);
  margin-block:14px;
}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:0 16px;
  height:100%;
  font-size:15px;
  font-weight:600;
  color:var(--text-primary);
  letter-spacing:0.03em;
  white-space:nowrap;
  transition:color var(--transition-fast),background var(--transition-fast);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:16px;
  right:16px;
  bottom:0;
  height:3px;
  background:var(--accent-lime);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform var(--transition-fast);
}
.nav-link:hover,
.nav-link:focus-visible{
  color:var(--accent-lime);
  background:rgba(182,255,0,0.06);
}
.nav-link[aria-current="page"]{
  color:var(--accent-lime);
}
.nav-link[aria-current="page"]::after,
.nav-link.is-chapter-active::after{
  transform:scaleX(1);
}
.nav-link.is-chapter-active{
  color:var(--accent-lime);
}
/* 移动导航按钮 */
.nav-toggle{
  display:none;
  position:relative;
  width:48px;
  height:48px;
  align-self:center;
  margin-left:auto;
  flex-shrink:0;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:5px;
  background:transparent;
  z-index:5;
}
.nav-toggle-bar{
  display:block;
  width:22px;
  height:2px;
  background:var(--accent-lime);
  transition:transform var(--transition-fast),opacity var(--transition-fast);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){
  transform:translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){
  opacity:0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){
  transform:translateY(-7px) rotate(-45deg);
}
/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--bg-deep);
  margin-top:var(--space-xl);
  border-top:1px solid rgba(182,255,0,0.2);
  overflow:hidden;
}
.footer-decor{
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:6px;
  background:linear-gradient(90deg,var(--accent-lime) 0%,var(--accent-orange) 40%,transparent 90%);
  pointer-events:none;
}
.footer-decor::after{
  content:"";
  position:absolute;
  top:6px;
  right:0;
  width:46%;
  height:2px;
  background:linear-gradient(90deg,transparent,rgba(182,255,0,0.4));
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1.2fr 0.9fr;
  gap:var(--space-md);
  padding-block:var(--space-lg);
}
.footer-brand .brand-block{
  margin-bottom:var(--space-sm);
}
.footer-logo .brand-mark{
  width:36px;
  height:36px;
  font-size:20px;
}
.footer-tagline{
  font-size:14px;
  line-height:1.7;
  color:var(--text-secondary);
  margin-bottom:var(--space-xs);
}
.trust-line{
  font-size:13px;
  color:var(--text-secondary);
  border-left:3px solid var(--accent-lime);
  padding-left:12px;
  margin-top:var(--space-sm);
  line-height:1.6;
}
.footer-title{
  font-family:var(--font-heading);
  font-size:13px;
  font-weight:800;
  letter-spacing:0.12em;
  text-transform:uppercase;
  color:var(--accent-lime);
  margin-bottom:14px;
  padding-bottom:8px;
  border-bottom:1px solid rgba(255,255,255,0.1);
}
.footer-links{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.footer-link{
  display:inline-flex;
  align-items:center;
  font-size:14px;
  color:var(--text-primary);
  transition:color var(--transition-fast),transform var(--transition-fast);
}
.footer-link::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--accent-lime);
  margin-right:10px;
  clip-path:polygon(0 0,100% 0,100% 100%,0 100%);
  flex-shrink:0;
  transition:clip-path var(--transition-fast);
}
.footer-link:hover,
.footer-link:focus-visible{
  color:var(--accent-lime);
}
.footer-link:hover::before,
.footer-link:focus-visible::before{
  clip-path:polygon(100% 0,100% 100%,0 100%,0 0);
}
.footer-contact-line{
  font-size:14px;
  line-height:1.8;
  color:var(--text-secondary);
  font-family:var(--font-data);
  margin-bottom:2px;
}
.footer-bottom{
  background:rgba(0,0,0,0.28);
  border-top:1px solid rgba(255,255,255,0.06);
}
.footer-bottom-inner{
  display:flex;
  justify-content:space-between;
  gap:var(--space-sm);
  padding-block:16px;
  font-size:12px;
  color:var(--text-secondary);
  flex-wrap:wrap;
}
.footer-bottom-inner p{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
/* ---------- 通用基础组件 ---------- */
.section-kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-data);
  font-size:13px;
  font-weight:700;
  letter-spacing:0.16em;
  color:var(--accent-lime);
  text-transform:uppercase;
  margin-bottom:14px;
}
.section-kicker::before{
  content:"";
  display:block;
  width:32px;
  height:2px;
  background:var(--accent-lime);
}
.tag-chip{
  display:inline-block;
  padding:4px 10px;
  font-size:11px;
  font-weight:800;
  letter-spacing:0.08em;
  border-radius:2px;
  text-transform:uppercase;
}
.tag-chip--orange{
  background:var(--accent-orange);
  color:var(--bg-deep);
}
.tag-chip--lime{
  background:var(--accent-lime);
  color:var(--bg-deep);
}
.btn-primary{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 24px;
  background:var(--accent-lime);
  color:var(--bg-deep);
  font-family:var(--font-heading);
  font-weight:800;
  font-size:15px;
  letter-spacing:0.04em;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  transition:transform var(--transition-fast),background var(--transition-fast);
}
.btn-primary:hover,
.btn-primary:focus-visible{
  background:var(--accent-orange);
  transform:translateY(-2px);
}
.btn-outline{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 24px;
  background:transparent;
  color:var(--white);
  font-family:var(--font-heading);
  font-weight:700;
  font-size:15px;
  border:2px solid var(--accent-lime);
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,12px 100%,0 calc(100% - 12px));
  transition:background var(--transition-fast),color var(--transition-fast);
}
.btn-outline:hover,
.btn-outline:focus-visible{
  background:var(--accent-lime);
  color:var(--bg-deep);
}
.data-table{
  width:100%;
  border-collapse:collapse;
  font-family:var(--font-data);
  font-size:14px;
  background:rgba(18,59,109,0.45);
  border-left:4px solid var(--accent-lime);
}
.data-table th{
  text-align:left;
  padding:12px 16px;
  font-size:12px;
  letter-spacing:0.08em;
  color:var(--accent-lime);
  border-bottom:1px solid rgba(255,255,255,0.14);
}
.data-table td{
  padding:12px 16px;
  border-bottom:1px solid rgba(255,255,255,0.08);
  color:var(--text-primary);
}
.data-table tr:last-child td{
  border-bottom:none;
}
.focus-card{
  position:relative;
  background:var(--bg-blue);
  border:1px solid rgba(255,255,255,0.08);
  padding:var(--space-md);
  clip-path:polygon(0 0,calc(100% - 16px) 0,100% 16px,100% 100%,16px 100%,0 calc(100% - 16px));
  transition:border-color var(--transition-fast),transform var(--transition-fast),background var(--transition-fast);
}
.focus-card:hover{
  transform:translateY(-4px);
  border-color:var(--accent-lime);
  background:rgba(18,59,109,0.8);
}
.focus-card__title{
  font-family:var(--font-heading);
  font-size:18px;
  font-weight:900;
  color:var(--white);
  margin-bottom:6px;
}
.focus-card__meta{
  font-family:var(--font-data);
  font-size:12px;
  color:var(--accent-lime);
  letter-spacing:0.06em;
  margin-bottom:10px;
}
.focus-card p{
  font-size:14px;
  color:var(--text-secondary);
}
/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  :root{
    --header-h:64px;
  }
  .footer-grid{
    grid-template-columns:1fr 1fr;
    gap:var(--space-md);
  }
  .footer-brand{
    grid-column:1 / -1;
    max-width:520px;
  }
}
@media (max-width:768px){
  .header-inner{
    height:var(--header-h);
  }
  .brand-title{
    font-size:17px;
  }
  .nav-toggle{
    display:flex;
  }
  .frame-nav{
    position:fixed;
    inset:0;
    z-index:50;
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:0;
    background:var(--bg-deep);
    clip-path:polygon(0 0,100% 0,100% 100%,0 100%);
    opacity:0;
    visibility:hidden;
    transform:translateY(20px);
    transition:opacity var(--transition-slow),transform var(--transition-slow),visibility var(--transition-slow);
    padding:var(--space-lg) var(--space-md);
  }
  .frame-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .frame-nav::before,
  .frame-nav::after{
    display:none;
  }
  .nav-link{
    width:min(480px,86vw);
    height:52px;
    justify-content:center;
    font-size:20px;
    font-family:var(--font-heading);
    font-weight:800;
    border-bottom:1px solid rgba(255,255,255,0.08);
  }
  .nav-link::after{
    left:40%;
    right:40%;
    bottom:6px;
    height:2px;
  }
  .footer-grid{
    grid-template-columns:1fr;
    gap:var(--space-md);
    padding-block:var(--space-md);
  }
  .footer-bottom-inner{
    justify-content:center;
    text-align:center;
  }
  .footer-bottom-inner p{
    justify-content:center;
  }
}
@media (max-width:480px){
  :root{
    --header-h:58px;
  }
  .brand-mark{
    width:34px;
    height:34px;
    font-size:18px;
  }
  .brand-title{
    font-size:15px;
  }
  .brand-title em{
    font-size:8px;
  }
  .nav-link{
    font-size:17px;
    height:48px;
  }
}
/* 减少动态 */
@media (prefers-reduced-motion:reduce){
  *,
  *::before,
  *::after{
    transition-duration:0.01ms!important;
    animation-duration:0.01ms!important;
    animation-iteration-count:1!important;
  }
  .frame-nav{
    transition:none;
  }
}