:root{
  --lc-orange:#F26522;
  --lc-orange-deep:#C24615;
  --lc-orange-soft:#FFE3D4;
  --lc-ink:#1E2A38;
  --lc-ink-2:#33465C;
  --lc-text:#3C4A59;
  --lc-muted:#6B7B8C;
  --lc-bg:#F6F7F9;
  --lc-teal:#0F7F73;
  --lc-teal-soft:#D8EFEB;
  --lc-line:#DCE2E9;
  --lc-warn:#B57A00;
  --lc-warn-soft:#FCF3DE;
  --lc-white:#FFFFFF;
  --lc-track:264px;
  --lc-bar-h:58px;
  --lc-radius:10px;
  --lc-radius-sm:4px;
  --lc-shadow-1:0 1px 2px rgba(30,42,56,.05);
  --lc-shadow-2:0 8px 22px rgba(30,42,56,.09);
  --lc-font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --lc-font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"DejaVu Sans Mono","Courier New",monospace;
  --lc-ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-left:calc(var(--lc-track) + 16px);
}
body{
  margin:0;
  padding-left:var(--lc-track);
  min-height:100vh;
  background:var(--lc-bg);
  color:var(--lc-text);
  font-family:var(--lc-font-sans);
  font-size:16px;
  line-height:1.75;
}
img,svg,video{display:block;max-width:100%;height:auto;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0;}
button{font:inherit;color:inherit;background:none;border:0;}
a{color:inherit;}
:focus-visible{outline:2px solid var(--lc-orange);outline-offset:2px;border-radius:4px;}
::selection{background:var(--lc-orange-soft);color:var(--lc-ink);}
#main-content{padding-top:36px;padding-bottom:64px;}

.lc-visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

/* ---------- 跳转链接 ---------- */
.lc-skip{
  position:fixed;top:-120px;left:16px;z-index:200;
  padding:10px 18px;border-radius:8px;
  background:var(--lc-orange);color:#fff;
  font-size:14px;text-decoration:none;
  box-shadow:var(--lc-shadow-2);
  transition:top .18s var(--lc-ease);
}
.lc-skip:focus{top:14px;}

/* ---------- 头部：桌面侧边轨道 ---------- */
.lc-header{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--lc-track);
  display:flex;
  flex-direction:column;
  background:var(--lc-ink);
  color:#fff;
  z-index:60;
  border-right:1px solid #26333F;
}
.lc-header__bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:22px 18px 18px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.lc-brand{display:flex;align-items:center;gap:10px;min-width:0;text-decoration:none;color:#fff;}
.lc-brand__mark{
  position:relative;flex:0 0 auto;
  width:28px;height:28px;border-radius:7px;
  background:var(--lc-orange);
}
.lc-brand__mark::before,
.lc-brand__mark::after{
  content:"";position:absolute;left:7px;height:2px;border-radius:2px;background:#fff;
}
.lc-brand__mark::before{top:10px;width:14px;}
.lc-brand__mark::after{top:16px;width:8px;}
.lc-brand__text{display:flex;flex-direction:column;gap:2px;min-width:0;}
.lc-brand__name{font-size:16px;font-weight:700;line-height:1.2;letter-spacing:.02em;color:#fff;}
.lc-brand__tag{font-size:12px;line-height:1.5;color:#8FA0B2;letter-spacing:.02em;}

.lc-nav-toggle{
  display:none;
  align-items:center;gap:8px;
  padding:8px 12px;border-radius:8px;
  border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.07);
  color:#fff;cursor:pointer;
  font-family:var(--lc-font-mono);font-size:13px;letter-spacing:.06em;
  transition:background .15s var(--lc-ease);
}
.lc-nav-toggle:hover{background:rgba(255,255,255,.13);}
.lc-nav-toggle__bars{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:#fff;transition:background .18s var(--lc-ease);}
.lc-nav-toggle__bars::before,
.lc-nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;background:#fff;
  transition:top .18s var(--lc-ease),transform .18s var(--lc-ease);
}
.lc-nav-toggle__bars::before{top:-5px;}
.lc-nav-toggle__bars::after{top:5px;}
.lc-header[data-open] .lc-nav-toggle__bars{background:transparent;}
.lc-header[data-open] .lc-nav-toggle__bars::before{top:0;transform:rotate(45deg);}
.lc-header[data-open] .lc-nav-toggle__bars::after{top:0;transform:rotate(-45deg);}

.lc-nav{
  flex:1 1 auto;
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:16px 12px 22px;
  overflow-y:auto;
  overscroll-behavior:contain;
}
.lc-nav__title{
  padding-left:14px;
  font-family:var(--lc-font-mono);
  font-size:12px;letter-spacing:.12em;text-transform:uppercase;
  color:#7E8FA1;
}
.lc-nav__list{display:flex;flex-direction:column;gap:2px;}
.lc-nav__item{display:block;}
.lc-nav__link{
  position:relative;
  display:flex;align-items:baseline;gap:10px;
  padding:9px 12px 9px 15px;
  border-radius:6px;
  color:#B9C5D2;
  text-decoration:none;
  transition:background .15s var(--lc-ease),color .15s var(--lc-ease),transform .15s var(--lc-ease);
}
.lc-nav__link::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;width:3px;
  border-radius:0 3px 3px 0;background:transparent;
  transition:background .15s var(--lc-ease);
}
.lc-nav__link:hover{background:rgba(255,255,255,.06);color:#fff;transform:translateX(2px);}
.lc-nav__link[aria-current="page"]{background:rgba(242,101,34,.16);color:#fff;}
.lc-nav__link[aria-current="page"]::before{background:var(--lc-orange);}
.lc-nav__num{flex:0 0 22px;font-family:var(--lc-font-mono);font-size:12px;letter-spacing:.06em;color:#7E8FA1;transition:color .15s var(--lc-ease);}
.lc-nav__link:hover .lc-nav__num,
.lc-nav__link[aria-current="page"] .lc-nav__num{color:var(--lc-orange);}
.lc-nav__label{font-size:14px;line-height:1.5;}

.lc-nav__quick{
  margin-top:auto;
  padding-top:16px;
  border-top:1px solid rgba(255,255,255,.1);
}
.lc-nav__quick-title{
  margin-bottom:10px;padding-left:2px;
  font-family:var(--lc-font-mono);font-size:12px;letter-spacing:.1em;
  color:#7E8FA1;
}
.lc-nav__quick-list{display:flex;flex-direction:column;gap:6px;}
.lc-nav__quick-link{
  display:flex;align-items:center;gap:9px;
  padding:7px 10px;border-radius:6px;
  background:rgba(255,255,255,.045);
  color:#C8D3DE;font-size:13px;line-height:1.5;text-decoration:none;
  transition:background .15s var(--lc-ease),color .15s var(--lc-ease),transform .15s var(--lc-ease);
}
.lc-nav__quick-link::before{
  content:"";flex:0 0 auto;width:5px;height:5px;border-radius:50%;
  background:var(--lc-teal);
}
.lc-nav__quick-link:hover{background:rgba(255,255,255,.1);color:#fff;transform:translateX(2px);}
.lc-nav__note{
  padding-left:2px;
  font-size:12px;line-height:1.6;color:#7B8B9C;
}

.lc-scroll-progress{
  position:fixed;top:0;left:var(--lc-track);right:0;height:3px;z-index:70;
  background:rgba(30,42,56,.07);
  pointer-events:none;
}
.lc-scroll-progress__bar{
  display:block;height:100%;width:0;
  background:var(--lc-orange);
  transition:width .1s linear;
}

/* ---------- 页脚 ---------- */
.lc-footer{
  margin-top:56px;
  background:var(--lc-ink);
  color:#BAC6D3;
  border-top:3px solid var(--lc-orange);
}
.lc-footer__inner{
  width:min(100% - 40px,1180px);
  margin-inline:auto;
  padding:48px 0 28px;
  display:grid;
  grid-template-columns:minmax(180px,240px) minmax(0,1fr);
  gap:40px;
}
.lc-footer__name{font-size:20px;font-weight:800;line-height:1.3;letter-spacing:.02em;color:#fff;}
.lc-footer__line{margin-top:8px;font-size:14px;line-height:1.7;color:#93A3B4;}
.lc-footer__stamp{
  margin-top:14px;
  font-family:var(--lc-font-mono);font-size:12px;letter-spacing:.06em;color:#7B8B9C;
}
.lc-footer__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;}
.lc-footer__col{min-width:0;}
.lc-footer__col-title{
  margin-bottom:14px;
  font-family:var(--lc-font-mono);font-size:12px;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;color:#fff;
}
.lc-footer__links{display:flex;flex-direction:column;gap:9px;}
.lc-footer__link{
  display:inline-block;
  font-size:14px;line-height:1.6;color:#BAC6D3;text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .15s var(--lc-ease),transform .15s var(--lc-ease);
}
.lc-footer__link:hover{color:#fff;transform:translateX(2px);}
.lc-footer__lines{display:flex;flex-direction:column;gap:12px;font-size:14px;line-height:1.65;}
.lc-footer__line{display:flex;flex-direction:column;gap:2px;}
.lc-footer__key{
  font-family:var(--lc-font-mono);font-size:12px;letter-spacing:.06em;color:#7B8B9C;
}
.lc-footer__value{color:#C6D0DB;word-break:break-word;}
.lc-copy{
  display:inline-flex;align-items:center;gap:8px;
  align-self:flex-start;
  padding:0 0 1px;cursor:pointer;
  font-family:var(--lc-font-mono);font-size:13px;letter-spacing:.04em;
  color:#DDE6EF;
  border-bottom:1px dashed rgba(255,255,255,.28);
  transition:color .15s var(--lc-ease),border-color .15s var(--lc-ease);
}
.lc-copy:hover,.lc-copy:focus-visible{color:#fff;border-bottom-color:var(--lc-orange);}
.lc-copy__hint{font-size:12px;color:var(--lc-orange);}
.lc-footer__base{
  width:min(100% - 40px,1180px);
  margin-inline:auto;
  padding:18px 0 34px;
  border-top:1px solid rgba(255,255,255,.1);
  display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 24px;
  font-size:13px;
}
.lc-footer__legal{font-family:var(--lc-font-mono);letter-spacing:.06em;color:#DDE6EF;}
.lc-footer__note{flex:1 1 320px;color:#8B9AAB;line-height:1.7;}
.lc-footer__year{font-family:var(--lc-font-mono);letter-spacing:.06em;color:#7B8B9C;}

/* ---------- 布局基础 ---------- */
.lc-container{width:min(100% - 40px,1180px);margin-inline:auto;}
.lc-section{margin-top:48px;}
.lc-section:first-child{margin-top:0;}
.lc-section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px;
  padding-bottom:14px;
  margin-bottom:24px;
  border-bottom:1px solid var(--lc-line);
}
.lc-section__title{font-size:24px;line-height:1.3;font-weight:800;color:var(--lc-ink);}
.lc-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--lc-font-mono);font-size:13px;letter-spacing:.08em;
  color:var(--lc-orange-deep);
}
.lc-eyebrow::before{content:"";width:14px;height:2px;border-radius:2px;background:var(--lc-orange);}
.lc-prose{max-width:68ch;}
.lc-prose p{margin:0 0 16px;}
.lc-prose p:last-child{margin-bottom:0;}
.lc-prose h2{margin:0 0 12px;font-size:22px;line-height:1.3;font-weight:800;color:var(--lc-ink);}
.lc-prose h3{margin:0 0 10px;font-size:18px;line-height:1.35;font-weight:700;color:var(--lc-ink);}
.lc-mono{font-family:var(--lc-font-mono);letter-spacing:.06em;}

.lc-grid{display:grid;gap:24px;}
.lc-grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.lc-grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
@media (max-width:900px){
  .lc-grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}
@media (max-width:600px){
  .lc-grid--2,.lc-grid--3{grid-template-columns:minmax(0,1fr);gap:16px;}
}

/* ---------- 通用组件 ---------- */
.lc-card{
  position:relative;display:block;
  padding:20px;
  background:var(--lc-white);
  border:1px solid var(--lc-line);
  border-radius:var(--lc-radius);
  box-shadow:var(--lc-shadow-1);
  transition:transform .18s var(--lc-ease),border-color .18s var(--lc-ease),box-shadow .18s var(--lc-ease);
}
.lc-card:hover{transform:translateY(-2px);border-color:#C4CFDB;box-shadow:var(--lc-shadow-2);}
.lc-card__title{font-size:18px;line-height:1.35;font-weight:700;color:var(--lc-ink);}
.lc-card__meta{margin-top:6px;font-family:var(--lc-font-mono);font-size:13px;letter-spacing:.06em;color:var(--lc-muted);}

.lc-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 8px;border-radius:var(--lc-radius-sm);border:1px solid transparent;
  font-family:var(--lc-font-mono);font-size:13px;line-height:1;letter-spacing:.06em;
}
.lc-tag--old{background:var(--lc-teal-soft);color:#0B5F56;border-color:#B7DFD8;}
.lc-tag--new{background:var(--lc-orange-soft);color:#9C3F12;border-color:#F7C7AC;}
.lc-tag--warn{background:var(--lc-warn-soft);color:var(--lc-warn);border-color:#EBDCB6;}

.lc-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 20px;border-radius:8px;border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;text-decoration:none;cursor:pointer;
  transition:background .18s var(--lc-ease),color .18s var(--lc-ease),border-color .18s var(--lc-ease),transform .18s var(--lc-ease);
}
.lc-btn--primary{background:var(--lc-orange);color:#fff;}
.lc-btn--primary:hover{background:var(--lc-orange-deep);transform:translateY(-2px);}
.lc-btn--ghost{background:var(--lc-white);color:var(--lc-ink);border-color:var(--lc-line);}
.lc-btn--ghost:hover{border-color:var(--lc-orange);color:var(--lc-orange-deep);transform:translateY(-2px);}
.lc-btn--quiet{background:transparent;color:var(--lc-orange-deep);padding-inline:4px;text-decoration:underline;text-underline-offset:4px;}
.lc-btn--quiet:hover{color:var(--lc-ink);}

.lc-breadcrumb{font-family:var(--lc-font-mono);font-size:13px;letter-spacing:.06em;color:var(--lc-muted);}
.lc-breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.lc-breadcrumb__item{display:inline-flex;align-items:center;gap:8px;}
.lc-breadcrumb__link{color:var(--lc-text);text-decoration:none;border-bottom:1px solid transparent;}
.lc-breadcrumb__link:hover{color:var(--lc-orange-deep);border-bottom-color:currentColor;}
.lc-breadcrumb__sep{color:#B6C1CD;}
.lc-breadcrumb__current{color:var(--lc-muted);}

.lc-filter{display:flex;flex-wrap:wrap;gap:8px;}
.lc-filter__btn{
  padding:8px 13px;border-radius:999px;
  border:1px solid var(--lc-line);background:var(--lc-white);color:var(--lc-text);
  font-family:var(--lc-font-mono);font-size:13px;line-height:1;letter-spacing:.06em;cursor:pointer;
  transition:background .15s var(--lc-ease),color .15s var(--lc-ease),border-color .15s var(--lc-ease);
}
.lc-filter__btn:hover{border-color:var(--lc-orange);color:var(--lc-orange-deep);}
.lc-filter__btn[aria-pressed="true"]{background:var(--lc-orange);border-color:var(--lc-orange);color:#fff;}
.lc-filter-item[hidden]{display:none;}
.lc-filter-item.is-fading{animation:lc-fade-in .12s var(--lc-ease) both;}
@keyframes lc-fade-in{from{opacity:0;}to{opacity:1;}}

.lc-progress{height:6px;border-radius:999px;background:#E6EBF1;overflow:hidden;}
.lc-progress__bar{
  display:block;height:100%;width:0;border-radius:999px;
  background:var(--lc-orange);
  transition:width .18s var(--lc-ease);
}

/* ---------- 图片容器（供页面阶段放置图片） ---------- */
.lc-figure{margin:0;}
.lc-media{
  position:relative;display:block;width:100%;overflow:hidden;
  border:1px solid var(--lc-line);border-radius:var(--lc-radius);
  background-color:#E9EEF3;
  background-image:repeating-linear-gradient(135deg,rgba(30,42,56,.05) 0 1px,transparent 1px 9px);
}
.lc-media--16x9{aspect-ratio:16 / 9;}
.lc-media--4x3{aspect-ratio:4 / 3;}
.lc-media--1x1{aspect-ratio:1 / 1;}
.lc-media--wide{aspect-ratio:21 / 9;}
.lc-media > img,
.lc-media > picture > img,
.lc-media > svg{display:block;width:100%;height:100%;object-fit:cover;}
.lc-figure__cap{
  margin-top:10px;
  font-family:var(--lc-font-mono);font-size:13px;line-height:1.6;letter-spacing:.04em;
  color:var(--lc-muted);
}

/* ---------- 响应式：移动端 ---------- */
@media (max-width:1023px){
  html{scroll-padding-left:0;scroll-padding-top:calc(var(--lc-bar-h) + 16px);}
  body{padding-left:0;padding-top:var(--lc-bar-h);}
  .lc-header{
    inset:0 0 auto 0;
    width:auto;height:var(--lc-bar-h);
    flex-direction:row;align-items:center;
    padding:0 14px;
    border-right:0;
    border-bottom:1px solid #26333F;
  }
  .lc-header__bar{flex:1 1 auto;padding:0;border-bottom:0;}
  .lc-brand__tag{display:none;}
  .lc-brand__name{font-size:15px;}
  .lc-nav-toggle{display:inline-flex;}
  .lc-nav{
    position:fixed;
    top:var(--lc-bar-h);left:0;right:0;
    max-height:calc(100vh - var(--lc-bar-h));
    max-height:calc(100dvh - var(--lc-bar-h));
    padding:16px 16px 26px;
    background:var(--lc-ink);
    border-top:1px solid rgba(255,255,255,.1);
    box-shadow:0 22px 40px rgba(15,23,32,.3);
    overflow-y:auto;
    transform:translateY(-10px);
    opacity:0;visibility:hidden;
    transition:opacity .18s var(--lc-ease),transform .18s var(--lc-ease),visibility .18s linear;
  }
  .lc-header[data-open] .lc-nav{transform:none;opacity:1;visibility:visible;}
  .lc-scroll-progress{left:0;}
  #main-content{padding-top:24px;padding-bottom:48px;}
}
@media (max-width:900px){
  .lc-footer__inner{grid-template-columns:minmax(0,1fr);gap:28px;}
  .lc-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
}
@media (max-width:520px){
  .lc-footer__cols{grid-template-columns:minmax(0,1fr);gap:22px;}
  .lc-footer__base{padding-bottom:28px;}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  .lc-card:hover,
  .lc-btn:hover,
  .lc-nav__link:hover,
  .lc-footer__link:hover,
  .lc-nav__quick-link:hover{transform:none;}
}