/* ==========================================================================
   E尊国客户端 · 共享站点样式 /assets/site.css
   01 reset · 02 tokens · 03 基础排版 · 04 头部 · 05 页脚
   06 按钮 · 07 基础组件 · 08 响应式 · 09 动效偏好
   ========================================================================== */

/* 01 reset ---------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:96px}
body,h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
table{border-collapse:collapse;width:100%}
:where(a,button,summary,input,[tabindex]):focus-visible{
  outline:2px solid var(--signal);
  outline-offset:3px;
  border-radius:4px;
}

/* 02 tokens --------------------------------------------------------------- */
:root{
  --ink-900:#0E1B2A;
  --ink-700:#1B2F45;
  --ink-500:#2E4863;
  --signal:#FF6A2B;
  --signal-deep:#E4551A;
  --signal-mist:#FFD9C2;
  --sand:#F4EFE7;
  --sand-deep:#E3DACB;
  --mint:#CFE3DC;
  --paper:#FBFAF7;
  --text:#16202B;
  --muted:#6B7784;

  --line:1px solid var(--sand-deep);
  --hair:1px solid rgba(251,250,247,.14);

  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --sans:"HarmonyOS Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --label:"Inter","HarmonyOS Sans","PingFang SC",system-ui,-apple-system,sans-serif;

  --r-lg:26px;
  --r-md:20px;
  --r-sm:14px;

  --wrap:1240px;
  --gutter:clamp(16px,3.2vw,44px);
  --pad-y:clamp(40px,6vw,88px);
  --header-h:88px;
}

/* 03 基础排版 -------------------------------------------------------------- */
body{
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.78;
  color:var(--text);
  background:var(--sand);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
h1,h2,h3{
  font-family:var(--serif);
  font-weight:600;
  letter-spacing:-.01em;
  line-height:1.26;
  color:var(--ink-900);
}
h1{font-size:clamp(28px,4vw,56px)}
h2{font-size:clamp(22px,2.6vw,34px)}
h3{font-family:var(--sans);font-size:clamp(17px,1.6vw,20px);font-weight:700;letter-spacing:0;line-height:1.5}
h4{font-family:var(--sans);font-size:16px;font-weight:700;line-height:1.5;color:var(--ink-900)}
small{font-size:13px}
strong{font-weight:700;color:var(--ink-900)}
::selection{background:var(--signal-mist);color:var(--ink-900)}

.prose{max-width:36em}
.prose p,.prose li{max-width:34em}
.prose p+p,.prose ul+p,.prose p+ul{margin-top:.9em}
.prose ul,.prose ol{display:grid;gap:.45em;padding-left:1.15em;list-style:disc}
.prose ol{list-style:decimal}
.prose a{color:var(--ink-900);border-bottom:1px solid var(--signal);transition:color .2s ease,background-color .2s ease}
.prose a:hover{color:var(--signal)}

.lede{
  max-width:32em;
  font-size:clamp(16px,1.7vw,19px);
  line-height:1.85;
  color:var(--ink-500);
}
.num{font-family:var(--label);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.visually-hidden{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

/* 04 头部 ----------------------------------------------------------------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--ink-900);
  color:var(--paper);
  border-bottom:1px solid rgba(251,250,247,.1);
}
.site-header__inner{
  position:relative;
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:14px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(14px,3vw,40px);
}
.site-header__rail{
  flex:1 1 auto;
  min-width:0;
  text-align:center;
  font-family:var(--label);
  font-size:11px;
  font-weight:700;
  letter-spacing:.22em;
  color:rgba(251,250,247,.36);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.skip-link{
  position:absolute;
  top:-120px;
  left:14px;
  z-index:200;
  padding:.7em 1.25em;
  background:var(--signal);
  color:#fff;
  border-radius:0 0 var(--r-sm) var(--r-sm);
  font-size:14px;
  font-weight:700;
  transition:top .2s ease;
}
.skip-link:focus{top:0}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:inherit;
  text-decoration:none;
}
.brand__mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  flex:0 0 auto;
  border-radius:11px;
  background:var(--signal);
  color:#fff;
  font-family:var(--label);
  font-size:17px;
  font-weight:700;
  line-height:1;
  transition:background-color .24s ease,transform .24s ease;
}
.brand:hover .brand__mark{background:var(--signal-deep);transform:translateY(-2px)}
.brand__text{display:grid;gap:2px;line-height:1.2}
.brand__name{
  font-family:var(--serif);
  font-size:17px;
  font-weight:600;
  letter-spacing:.01em;
  color:var(--paper);
}
.brand__meta{
  font-family:var(--label);
  font-size:11px;
  font-weight:500;
  letter-spacing:.13em;
  color:rgba(251,250,247,.5);
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:9px 14px;
  border-radius:999px;
  background:rgba(251,250,247,.08);
  border:1px solid rgba(251,250,247,.22);
  color:var(--paper);
  font-family:var(--label);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  cursor:pointer;
  transition:background-color .2s ease,border-color .2s ease;
}
.nav-toggle:hover{background:rgba(251,250,247,.16);border-color:rgba(251,250,247,.4)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars i{display:block;height:2px;border-radius:2px;background:currentColor;transition:transform .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child{transform:translateY(-3px) rotate(-45deg)}

.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,28px);
  flex:0 0 auto;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(4px,1.4vw,18px);
}
.site-nav__list a{
  position:relative;
  display:inline-block;
  padding:8px 8px;
  border-radius:6px;
  font-size:14px;
  font-weight:500;
  color:rgba(251,250,247,.78);
  transition:color .2s ease,background-color .2s ease;
}
.site-nav__list a::after{
  content:"";
  position:absolute;
  left:8px;
  right:8px;
  bottom:3px;
  height:2px;
  border-radius:2px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .24s ease;
}
.site-nav__list a:hover{color:#fff;background:rgba(251,250,247,.08)}
.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after,
.site-nav__list a[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__list a[aria-current="page"]{color:#fff;font-weight:700}
.site-nav__cta{flex:0 0 auto;margin-left:6px}

.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:0 50%;
  will-change:transform;
}

/* 05 页脚 ----------------------------------------------------------------- */
.site-footer{
  margin-top:auto;
  background:var(--ink-900);
  color:rgba(251,250,247,.72);
  border-top:2px solid var(--signal);
}
.site-footer__inner{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:clamp(40px,6vw,76px) var(--gutter) clamp(26px,4vw,42px);
  display:grid;
  grid-template-columns:minmax(0,1.7fr) repeat(3,minmax(0,1fr));
  gap:clamp(24px,4vw,56px);
}
.site-footer__brand{display:grid;gap:16px;align-content:start;justify-items:start}
.brand--footer{gap:12px}
.site-footer__blurb{
  max-width:24em;
  font-size:14px;
  line-height:1.8;
  color:rgba(251,250,247,.58);
}
.site-footer__col ul{display:grid;gap:4px;margin-top:14px}
.site-footer__head{
  font-family:var(--label);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  color:rgba(251,250,247,.42);
  text-transform:uppercase;
}
.site-footer__col a{
  position:relative;
  display:inline-block;
  padding:3px 0;
  font-size:14.5px;
  color:rgba(251,250,247,.74);
  transition:color .2s ease;
}
.site-footer__col a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:1px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .24s ease;
}
.site-footer__col a:hover{color:#fff}
.site-footer__col a:hover::after,
.site-footer__col a:focus-visible::after{transform:scaleX(1)}

.site-footer__contact{border-top:var(--hair)}
.site-footer__contact-inner{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:20px var(--gutter);
  display:flex;
  flex-wrap:wrap;
  gap:12px 32px;
  font-size:13.5px;
  line-height:1.7;
  color:rgba(251,250,247,.62);
}
.site-footer__item{display:inline-flex;align-items:center;gap:10px;flex-wrap:wrap;max-width:none}
.site-footer__key{
  font-family:var(--label);
  font-size:10.5px;
  font-weight:700;
  letter-spacing:.16em;
  color:rgba(251,250,247,.4);
  text-transform:uppercase;
}
.site-footer__value{color:rgba(251,250,247,.86);word-break:break-all}
.copy-btn{
  padding:2px 10px;
  border-radius:999px;
  border:1px solid rgba(251,250,247,.28);
  background:transparent;
  color:rgba(251,250,247,.7);
  font-family:var(--label);
  font-size:10.5px;
  font-weight:700;
  letter-spacing:.12em;
  cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.copy-btn:hover{background:var(--signal-mist);border-color:var(--signal-mist);color:var(--ink-900)}
.copy-btn.is-copied{background:var(--signal);border-color:var(--signal);color:#fff}

.site-footer__legal{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding:0 var(--gutter) clamp(24px,3vw,32px);
  font-size:12.5px;
  line-height:1.8;
  color:rgba(251,250,247,.42);
}

/* 06 按钮 ----------------------------------------------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55em;
  padding:.66em 1.2em;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--sans);
  font-size:14px;
  font-weight:700;
  line-height:1.2;
  cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn--signal{background:var(--signal);color:#fff}
.btn--signal:hover{background:var(--signal-deep);color:#fff}
.btn--ink{background:var(--ink-900);color:var(--paper)}
.btn--ink:hover{background:var(--ink-700)}
.btn--ghost{background:var(--paper);border-color:var(--sand-deep);color:var(--ink-900)}
.btn--ghost:hover{border-color:var(--ink-500);background:var(--sand)}
.btn--onink{background:transparent;border-color:rgba(251,250,247,.34);color:var(--paper)}
.btn--onink:hover{background:rgba(251,250,247,.1);border-color:var(--paper)}

/* 07 基础组件 -------------------------------------------------------------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.band{background:var(--mint)}
.band--sand{background:var(--sand)}
.band--deep{background:var(--sand-deep)}
.band--paper{background:var(--paper)}
.band--ink{background:var(--ink-900);color:var(--paper)}
.band--ink h1,.band--ink h2,.band--ink h3,.band--ink strong{color:var(--paper)}
.band--ink .lede{color:rgba(251,250,247,.72)}
.band>.wrap{padding-block:var(--pad-y)}

.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--asym{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.stack>*+*{margin-top:1em}

.chapter-head{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  align-items:baseline;
  gap:2px clamp(12px,2vw,22px);
  padding-top:16px;
  border-top:2px solid var(--signal);
  margin-bottom:clamp(18px,3vw,32px);
}
.chapter-head__index{
  font-family:var(--label);
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--signal);
  font-variant-numeric:tabular-nums;
}
.chapter-head__title{margin:0;grid-column:2}
.chapter-head__note{
  grid-column:2;
  margin-top:6px;
  max-width:34em;
  font-size:14px;
  line-height:1.75;
  color:var(--muted);
}
.band--ink .chapter-head__note{color:rgba(251,250,247,.6)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.36em .72em;
  border-radius:7px;
  font-family:var(--label);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  line-height:1.2;
  text-transform:uppercase;
  background:var(--sand-deep);
  color:var(--ink-700);
}
.tag--mint{background:var(--mint);color:var(--ink-700)}
.tag--orange{background:var(--signal-mist);color:#7A2A00}
.tag--ink{background:var(--ink-700);color:var(--paper)}
.tag--line{background:transparent;border:1px solid var(--sand-deep);color:var(--ink-500)}

.crumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5em;
  font-size:13px;
  color:var(--muted);
}
.crumbs li{display:inline-flex;align-items:center;gap:.5em}
.crumbs li+li::before{content:"/";color:var(--sand-deep)}
.crumbs a{color:var(--ink-500);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.crumbs a:hover{color:var(--signal);border-bottom-color:var(--signal)}
.crumbs [aria-current="page"]{color:var(--ink-900);font-weight:700}

.panel{
  background:var(--paper);
  border-radius:var(--r-md);
  padding:clamp(20px,3vw,32px);
}
.band--ink .panel{background:var(--ink-700);color:var(--paper)}

.media{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-lg);
  background:var(--mint);
  isolation:isolate;
}
.media img{width:100%;height:100%;object-fit:cover}
.media--4x3{aspect-ratio:4/3}
.media--16x9{aspect-ratio:16/9}
.media--1x1{aspect-ratio:1/1}
.media--4x5{aspect-ratio:4/5}
.media__caption{
  display:block;
  margin-top:10px;
  font-size:13px;
  line-height:1.65;
  color:var(--muted);
}
.media-placeholder{
  display:grid;
  place-items:center;
  width:100%;
  height:100%;
  min-height:160px;
  color:var(--ink-500);
  font-family:var(--label);
  font-size:11px;
  font-weight:700;
  letter-spacing:.2em;
  text-transform:uppercase;
  background-color:var(--mint);
  background-image:
    repeating-linear-gradient(0deg,rgba(14,27,42,.09) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(90deg,rgba(14,27,42,.09) 0 1px,transparent 1px 44px);
}

.side-index{
  position:sticky;
  top:calc(var(--header-h) + 16px);
  font-size:13px;
}
.side-index__title{
  margin-bottom:12px;
  font-family:var(--label);
  font-size:11px;
  font-weight:700;
  letter-spacing:.16em;
  color:var(--muted);
  text-transform:uppercase;
}
.side-index ol{display:grid;gap:2px}
.side-index a{
  display:block;
  padding:7px 0 7px 12px;
  border-left:2px solid var(--sand-deep);
  color:var(--ink-500);
  line-height:1.6;
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
}
.side-index a:hover{border-left-color:var(--signal);color:var(--ink-900);background:rgba(255,217,194,.45)}
.side-index a.is-active{border-left-color:var(--signal);color:var(--ink-900);font-weight:700}

[data-section]{scroll-margin-top:calc(var(--header-h) + 16px)}
html.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .32s ease,transform .32s ease}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* 08 响应式 --------------------------------------------------------------- */
@media (max-width:1180px){
  .site-header__rail{display:none}
}
@media (max-width:1040px){
  :root{--header-h:76px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px var(--gutter) 22px;
    background:var(--ink-700);
    border-top:var(--hair);
    max-height:min(72vh,520px);
    overflow-y:auto;
    z-index:70;
  }
  .site-nav[data-open]{display:flex}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__list a{
    display:block;
    padding:13px 4px;
    border-radius:0;
    border-bottom:1px solid rgba(251,250,247,.1);
    font-size:15px;
    color:rgba(251,250,247,.82);
  }
  .site-nav__list a::after{display:none}
  .site-nav__list a:hover{background:rgba(251,250,247,.06)}
  .site-nav__list a[aria-current="page"]{
    color:var(--signal-mist);
    background:rgba(255,106,43,.1);
    border-bottom-color:rgba(255,106,43,.35);
    padding-left:12px;
    box-shadow:inset 3px 0 0 var(--signal);
  }
  .site-nav__cta{margin-top:18px;justify-content:center}
  .site-footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--asym{grid-template-columns:minmax(0,1fr)}
  .side-index{position:static;top:auto}
}
@media (max-width:760px){
  body{font-size:16px}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .site-footer__inner{grid-template-columns:minmax(0,1fr);gap:30px}
  .site-footer__contact-inner{flex-direction:column;gap:10px}
  .site-footer__item{width:100%}
  .media--16x9{aspect-ratio:3/2}
}
@media (max-width:460px){
  .brand__meta{display:none}
  .nav-toggle__text{display:none}
  .nav-toggle{padding:9px 12px}
}

/* 09 动效偏好 ------------------------------------------------------------- */
@media (prefers-reduced-motion:no-preference){
  html{scroll-behavior:smooth}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .brand:hover .brand__mark{transform:none}
}