:root{
  --indigo:#12245A;
  --midnight:#0A1638;
  --cream:#F6F1E4;
  --ink:#241C18;
  --cyan:#35F2D6;
  --orange:#FF7A29;
  --amber:#FFC24B;
  --mist:#8FA6C4;
  --frost:#F2F5FA;
  --fs-1:12px;--fs-2:14px;--fs-3:17px;--fs-4:21px;--fs-5:26px;
  --fs-6:34px;--fs-7:48px;--fs-8:72px;--fs-9:104px;
  --maxw:1180px;
  --bar:52px;
  --bar-tight:44px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
}
@media (max-width:640px){
  :root{--fs-5:21px;--fs-6:27px;--fs-7:38px;--fs-8:58px;--fs-9:83px;}
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--cream);color:var(--ink);
  font-family:var(--font);font-size:var(--fs-3);line-height:1.75;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:900;line-height:1.15;letter-spacing:-.02em}
h1{font-size:var(--fs-7)}
h2{font-size:var(--fs-6)}
h3{font-size:var(--fs-4)}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
em{font-style:normal}
hr{border:0}
::selection{background:var(--cyan);color:var(--indigo)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
#main-content{display:block;outline:none;scroll-margin-top:72px}

/* ---------- 容器 / 栅格 ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}
@media (max-width:900px){
  .grid{grid-template-columns:repeat(6,1fr);gap:20px}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 6}
  .col-12{grid-column:span 6}
}
@media (max-width:640px){
  .grid{grid-template-columns:1fr;gap:16px}
  .col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:1 / -1}
}

/* ---------- 分区换气 ---------- */
.sec{padding:96px 0;position:relative}
.sec--tight{padding:56px 0}
.sec--cream{background:var(--cream);color:var(--ink)}
.sec--indigo{background:var(--indigo);color:var(--frost)}
.sec--midnight{background:var(--midnight);color:var(--frost)}
.sec--indigo .prose,.sec--midnight .prose{color:rgba(242,245,250,.88)}
@media (max-width:900px){.sec{padding:68px 0}.sec--tight{padding:44px 0}}
@media (max-width:640px){.sec{padding:52px 0}.sec--tight{padding:36px 0}}

/* ---------- 章节编号 ---------- */
.chapter{display:flex;align-items:baseline;gap:18px;margin:0 0 28px}
.chapter__num{
  flex:0 0 64px;min-width:64px;
  font-size:var(--fs-2);font-weight:900;letter-spacing:.14em;
  font-variant-numeric:tabular-nums;color:var(--mist);
  transition:color .32s var(--ease);
}
.chapter.is-live .chapter__num{color:var(--cyan)}
.chapter__title{font-size:var(--fs-6);letter-spacing:-.03em}
@media (max-width:640px){
  .chapter{gap:10px;margin-bottom:20px}
  .chapter__num{flex-basis:44px;min-width:44px;font-size:11px}
}

/* ---------- 短色带 ---------- */
.band{
  display:block;height:6px;width:34%;max-width:420px;
  background:var(--cyan);border:0;
}
.band--orange{background:var(--orange)}
.band--slash{clip-path:polygon(0 0,100% 0,calc(100% - 12px) 100%,0 100%)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid transparent;border-radius:999px;
  font-size:var(--fs-2);font-weight:800;letter-spacing:.02em;line-height:1.2;
  transition:transform .16s ease-out,background-color .16s ease-out,border-color .16s ease-out,color .16s ease-out;
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--orange);color:var(--ink)}
.btn--primary:hover{background:#FF8C46}
.btn--ghost{border-color:var(--mist);color:var(--frost)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--paper{background:var(--indigo);color:var(--frost)}
.btn--paper:hover{background:#1A3170}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:999px;border:1px solid var(--mist);
  font-size:var(--fs-1);font-weight:800;letter-spacing:.1em;
  color:var(--mist);font-variant-numeric:tabular-nums;
}
.tag--cyan{color:var(--cyan);border-color:rgba(53,242,214,.6)}
.tag--amber{background:var(--amber);border-color:transparent;color:var(--ink)}

/* ---------- 面包屑 ---------- */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:var(--fs-2);color:var(--mist);padding:18px 0 0}
.crumbs__link{color:var(--mist);transition:color .16s ease-out}
.crumbs__link:hover{color:var(--cyan)}
.crumbs__sep{color:rgba(143,166,196,.6)}
.crumbs__sep::before{content:"/"}
.crumbs__current{color:currentColor;font-weight:800;font-variant-numeric:tabular-nums}
.sec--indigo .crumbs,.sec--midnight .crumbs{color:var(--mist)}

/* ---------- 正文容器 ---------- */
.prose{max-width:62ch;font-size:var(--fs-3);line-height:1.75}
.prose p{margin:0 0 1.1em}
.prose h2{font-size:var(--fs-5);margin:1.5em 0 .5em}
.prose h3{font-size:var(--fs-4);margin:1.4em 0 .45em}
.prose ul{list-style:none;margin:0 0 1.2em;padding:0}
.prose li{padding-left:20px;position:relative;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.7em;width:8px;height:2px;background:var(--orange)}
.lede{font-size:var(--fs-4);line-height:1.65;max-width:34ch;letter-spacing:-.01em}
.rule{height:1px;background:currentColor;opacity:.18;margin:34px 0}

/* ---------- 数字锚点 ---------- */
.num-anchor{display:block}
.num-anchor__value{
  display:block;font-size:var(--fs-8);font-weight:900;line-height:1;
  letter-spacing:-.04em;font-variant-numeric:tabular-nums;color:var(--orange);
}
.num-anchor__unit{font-size:var(--fs-4);font-weight:900;letter-spacing:0;margin-left:.12em}
.num-anchor__label{display:block;margin-top:10px;font-size:var(--fs-2);color:var(--mist);line-height:1.6}
.sec--cream .num-anchor__label{color:rgba(36,28,24,.6)}
.num-anchor--cyan .num-anchor__value{color:var(--cyan)}
.num-anchor--amber .num-anchor__value{color:var(--amber)}
.num-anchor--paper .num-anchor__value{color:var(--cream)}

/* ---------- 折叠条目 ---------- */
.acc{border-top:1px solid rgba(143,166,196,.35);padding:0}
.acc__head{display:flex;align-items:center;gap:16px;width:100%;padding:20px 0;text-align:left}
.acc__toggle{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;padding:0;font-size:var(--fs-4);font-weight:800;letter-spacing:-.01em;
  transition:color .16s ease-out;
}
.acc__toggle::after{
  content:"+";flex:none;width:28px;height:28px;border-radius:50%;
  border:1px solid var(--mist);color:var(--mist);
  display:grid;place-items:center;font-size:16px;line-height:1;
  transition:transform .16s ease-out,border-color .16s ease-out,color .16s ease-out;
}
.acc__toggle:hover{color:var(--orange)}
.acc__toggle:hover::after{border-color:var(--orange);color:var(--orange)}
.acc[data-open="true"] .acc__toggle::after{transform:rotate(45deg);border-color:var(--cyan);color:var(--cyan)}
.acc__panel{display:none;padding:0 0 22px}
.acc[data-open="true"] .acc__panel{display:block}
.acc__body{max-width:62ch;font-size:var(--fs-3);color:inherit;opacity:.88}

/* ---------- 图位基础（供页面阶段放图） ---------- */
.media-frame{
  position:relative;overflow:hidden;
  background:linear-gradient(140deg,var(--indigo) 0%,var(--midnight) 100%);
  border-radius:18px;
}
.media-frame--slant{border-radius:18px 18px 18px 64px}
.media-frame--16x9{aspect-ratio:16 / 9}
.media-frame--4x5{aspect-ratio:4 / 5}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(242,245,250,.07) 0 1px,transparent 1px 4px);
  mix-blend-mode:screen;
}
.media-frame__cap{
  margin:10px 0 0;font-size:var(--fs-2);color:var(--mist);
}
@media (max-width:640px){
  .media-frame--slant{border-radius:14px 14px 14px 40px}
}

/* ---------- 滚动显现 ---------- */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease-out,transform .5s ease-out}
.js .reveal.is-in{opacity:1;transform:none}

/* ================= 命令栏 ================= */
.cmdbar{
  position:sticky;top:0;z-index:90;
  background:var(--midnight);color:var(--frost);
  border-bottom:1px solid rgba(143,166,196,.25);
}
.cmdbar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:var(--bar);transition:height .16s ease-out;
}
.cmdbar.is-tight .cmdbar__inner{height:var(--bar-tight)}
.cmdbar__progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;z-index:2;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--orange) 100%);
}
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:110;
  padding:10px 16px;border-radius:0 0 10px 10px;
  background:var(--cyan);color:var(--indigo);
  font-size:13px;font-weight:900;letter-spacing:.04em;
  transition:top .16s ease-out;
}
.skip-link:focus{top:0}

.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand__mark{
  width:26px;height:26px;border-radius:8px;flex:none;
  background:var(--cyan);color:var(--indigo);
  display:grid;place-items:center;font-size:14px;font-weight:900;letter-spacing:0;
}
.brand__text{font-size:15px;font-weight:900;letter-spacing:-.01em;white-space:nowrap}
.brand__sep{margin:0 .32em;opacity:.5}
.brand__code{
  padding:2px 6px;border:1px solid rgba(143,166,196,.4);border-radius:4px;
  font-size:11px;font-weight:800;letter-spacing:.14em;color:var(--mist);
}

.cmdnav{display:flex;flex:1 1 auto;justify-content:center;min-width:0}
.cmdnav__head{display:none}
.cmdnav__list{display:flex;align-items:center;gap:2px;overflow:hidden}
.cmdnav__item{flex:none}
.cmdnav__link{
  position:relative;display:inline-flex;align-items:center;gap:7px;
  padding:9px 10px;border-radius:8px;
  font-size:13.5px;font-weight:700;color:rgba(242,245,250,.76);
  transition:color .16s ease-out,background-color .16s ease-out,transform .16s ease-out;
}
.cmdnav__link:hover{color:var(--frost);background:rgba(53,242,214,.09);transform:translateY(-2px)}
.cmdnav__num{
  font-size:11px;font-weight:900;letter-spacing:.08em;
  font-variant-numeric:tabular-nums;color:var(--mist);
  transition:color .16s ease-out;
}
.cmdnav__link:hover .cmdnav__num{color:var(--cyan)}
.cmdnav__link[aria-current="page"]{color:var(--cyan)}
.cmdnav__link[aria-current="page"] .cmdnav__num{color:var(--cyan)}
.cmdnav__link[aria-current="page"]::after{
  content:"";position:absolute;left:10px;right:10px;bottom:3px;height:2px;
  background:var(--cyan);border-radius:2px;
}
.cmdnav__label{white-space:nowrap}
.cmdnav__extra{display:none}
.cmdnav__extra-link{
  display:block;padding:11px 8px;border-radius:8px;
  font-size:15px;font-weight:800;letter-spacing:.02em;
  border:1px solid rgba(143,166,196,.35);
  transition:border-color .16s ease-out,color .16s ease-out,transform .16s ease-out;
}
.cmdnav__extra-link:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}
.cmdnav__icp{margin:14px 0 0;font-size:11px;letter-spacing:.1em;color:rgba(143,166,196,.8)}

.cmdbar__actions{display:flex;align-items:center;gap:14px;flex:none}
.cmdbar__login{
  font-size:13px;font-weight:800;color:var(--frost);
  padding-bottom:2px;border-bottom:1px dashed rgba(143,166,196,.65);
  transition:color .16s ease-out,border-color .16s ease-out;
}
.cmdbar__login:hover{color:var(--cyan);border-color:var(--cyan)}
.cmdbar .btn{padding:8px 16px;font-size:13px}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;border:1px solid rgba(143,166,196,.45);border-radius:999px;
  font-size:12px;font-weight:800;letter-spacing:.1em;color:var(--frost);
  transition:border-color .16s ease-out,color .16s ease-out;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars span{
  display:block;height:2px;border-radius:2px;background:currentColor;
  transition:transform .16s ease-out,opacity .16s ease-out;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.nav-scrim{position:fixed;inset:0;background:rgba(10,22,56,.66);z-index:94}
.nav-scrim[hidden]{display:none}

@media (max-width:1100px){
  .nav-toggle{display:inline-flex;position:relative;z-index:96}
  .brand__code{display:none}
  .cmdnav{
    position:fixed;top:0;right:0;bottom:0;z-index:95;
    display:flex;flex-direction:column;flex:none;justify-content:flex-start;
    width:min(88vw,360px);padding:76px 22px 28px;
    background:var(--indigo);border-left:1px solid rgba(53,242,214,.28);
    overflow-y:auto;visibility:hidden;transform:translateX(102%);
    transition:transform .2s ease-out,visibility .2s ease-out;
  }
  .cmdnav[data-open="true"]{visibility:visible;transform:translateX(0)}
  .cmdnav__head{
    display:block;margin:0 0 14px;
    font-size:11px;font-weight:800;letter-spacing:.18em;color:var(--mist);
  }
  .cmdnav__list{flex-direction:column;align-items:stretch;gap:0;overflow:visible}
  .cmdnav__item{flex:none}
  .cmdnav__link{
    padding:14px 8px;border-radius:0;font-size:16px;
    border-bottom:1px solid rgba(143,166,196,.18);
  }
  .cmdnav__link:hover{transform:none;background:rgba(53,242,214,.08)}
  .cmdnav__link[aria-current="page"]{background:rgba(53,242,214,.1)}
  .cmdnav__link[aria-current="page"]::after{display:none}
  .cmdnav__extra{display:flex;flex-direction:column;gap:10px;margin-top:24px;padding-top:20px;border-top:1px solid rgba(143,166,196,.28)}
}
@media (max-width:760px){
  .cmdbar__login{display:none}
  .brand__text{font-size:13.5px}
  .cmdbar .btn{padding:7px 12px;font-size:12px}
}
@media (max-width:420px){
  .nav-toggle__label{display:none}
  .brand__text{font-size:12.5px;letter-spacing:0}
}

/* ================= 页脚 ================= */
.site-foot{position:relative;background:var(--midnight);color:var(--frost)}
.foot-band{
  display:block;height:6px;width:min(420px,34%);
  background:var(--cyan);
  clip-path:polygon(0 0,100% 0,calc(100% - 12px) 100%,0 100%);
}
.site-foot__inner{
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1.4fr;gap:40px;
  padding-top:72px;padding-bottom:56px;
}
.foot-block--brand{max-width:34ch}
.foot-brand{display:flex;align-items:center;gap:10px;margin:0 0 14px;font-size:17px;font-weight:900;letter-spacing:-.01em}
.foot-brand__mark{
  width:24px;height:24px;border-radius:7px;flex:none;
  background:var(--orange);color:var(--ink);
  display:grid;place-items:center;font-size:13px;font-weight:900;letter-spacing:0;
}
.foot-line{margin:0;font-size:14px;line-height:1.7;color:var(--mist)}
.foot-span{
  display:inline-block;margin-top:16px;padding:3px 10px;border-radius:999px;
  border:1px solid rgba(53,242,214,.4);
  font-size:11px;font-weight:800;letter-spacing:.14em;color:var(--cyan);
}
.foot-title{
  margin:0 0 16px;font-size:11px;font-weight:900;letter-spacing:.18em;
  color:var(--mist);
}
.foot-list{display:grid;gap:10px}
.foot-link{
  font-size:14px;color:var(--frost);opacity:.86;
  transition:color .16s ease-out,opacity .16s ease-out,transform .16s ease-out;
}
.foot-link:hover{color:var(--cyan);opacity:1;transform:translateY(-2px)}
.foot-meta{display:grid;gap:15px}
.foot-meta__item{font-size:14px}
.foot-meta__label{
  display:block;margin-bottom:3px;
  font-size:11px;font-weight:800;letter-spacing:.14em;color:var(--mist);
}
.foot-meta__value{
  display:block;color:rgba(242,245,250,.9);line-height:1.65;
  font-variant-numeric:tabular-nums;
}
.foot-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  padding-top:22px;padding-bottom:26px;
  border-top:1px solid rgba(143,166,196,.22);
  font-size:12px;letter-spacing:.04em;color:var(--mist);
  font-variant-numeric:tabular-nums;
}
.foot-legal__icp{color:rgba(242,245,250,.72)}
.foot-legal__note{color:rgba(143,166,196,.85)}
@media (max-width:900px){
  .site-foot__inner{grid-template-columns:1fr 1fr;gap:32px;padding-top:56px;padding-bottom:40px}
}
@media (max-width:560px){
  .site-foot__inner{grid-template-columns:1fr;gap:28px;padding-top:44px}
  .foot-legal{flex-direction:column;align-items:flex-start;gap:8px}
}

/* ================= 动效偏好 ================= */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .btn:hover,.foot-link:hover,.cmdnav__link:hover,.cmdnav__extra-link:hover{transform:none}
  .js .reveal{opacity:1;transform:none}
}