/* =========================================================
   万利平台中心 · 共享站点样式 /assets/site.css
   Frame Index System：框架式导航 + 沙金索引带 + 画册式留白
   ========================================================= */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:150px}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg{display:block;max-width:100%}
table{width:100%;border-collapse:collapse}

:root{
  --green:#0B5D4E;
  --green-deep:#08483D;
  --ink:#13211D;
  --paper:#FAF6EA;
  --mist:#D8E3DD;
  --sand:#B8862D;
  --sand-soft:#EAD9B6;
  --orange:#E56B1F;
  --violet:#5A4A78;
  --wind:#2E6F7D;
  --white:#FFFFFF;
  --line:rgba(19,33,29,.14);
  --line-strong:rgba(19,33,29,.32);
  --line-paper:rgba(250,246,234,.2);
  --shadow-soft:0 22px 48px -34px rgba(19,33,29,.5);
  --r-lg:28px;
  --r-md:18px;
  --r-sm:10px;
  --r-pill:999px;
  --maxw:1240px;
  --pad:clamp(18px,4vw,48px);
  --gap:clamp(16px,2.4vw,32px);
  --font-display:"Source Han Serif SC","Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:clamp(16px,1.02vw,17.5px);
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.2;letter-spacing:.008em}
h1{font-size:clamp(32px,5vw,64px)}
h2{font-size:clamp(26px,3.6vw,42px)}
h3{font-size:clamp(20px,2.2vw,26px)}
p{max-width:72ch}
strong,b{font-weight:600}
small{font-size:12.5px}
::selection{background:var(--sand-soft);color:var(--ink)}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px;border-radius:6px}

.mono{font-family:var(--font-mono);letter-spacing:.09em;font-variant-numeric:tabular-nums}
.sr-only{
  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;
}

/* ---------- 布局容器 ---------- */
.container{
  width:100%;
  max-width:calc(var(--maxw) + var(--pad) * 2);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.section{padding-block:clamp(40px,6vw,80px)}
.section__head{display:grid;gap:12px;max-width:64ch;margin-bottom:clamp(22px,3vw,38px)}
.section-title{font-family:var(--font-display);font-size:clamp(26px,3.6vw,42px);font-weight:700;line-height:1.2}
.lede{font-size:clamp(15.5px,1.15vw,18px);color:rgba(19,33,29,.72);max-width:62ch}
.index-label{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--sand);
}
.index-label::before{content:"";width:22px;height:1px;background:currentColor}

/* ---------- 栅格 ---------- */
.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.72em 1.45em;border-radius:var(--r-pill);
  font-family:var(--font-sans);font-size:14.5px;font-weight:600;letter-spacing:.06em;
  border:1px solid transparent;
  transition:background-color .22s ease,color .22s ease,border-color .22s ease,transform .22s ease;
}
.btn--primary{background:var(--orange);color:var(--ink);box-shadow:0 12px 24px -18px rgba(229,107,31,.9)}
.btn--primary:hover{background:#f07a2c;transform:translateY(-2px)}
.btn--solid{background:var(--green);color:var(--paper)}
.btn--solid:hover{background:var(--green-deep);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn--ghost:hover{background:var(--mist);border-color:var(--green)}
.btn--link{
  padding:.35em 0;border-radius:0;color:var(--wind);font-weight:600;
  border-bottom:1px solid rgba(46,111,125,.45);
}
.btn--link:hover{color:var(--green);border-bottom-color:var(--green)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{font-size:12.5px;letter-spacing:.06em;color:rgba(19,33,29,.55);padding-block:18px}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:var(--sand)}
.breadcrumbs a{transition:color .2s ease}
.breadcrumbs a:hover{color:var(--green);text-decoration:underline;text-underline-offset:3px}
.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:600}

/* ---------- 图片容器基础规则 ---------- */
.figure{display:grid;gap:10px;min-width:0}
.figure__media{
  position:relative;overflow:hidden;
  aspect-ratio:16 / 9;
  border-radius:var(--r-lg);
  background:
    radial-gradient(120% 88% at 16% 12%,rgba(250,246,234,.92),transparent 62%),
    linear-gradient(168deg,var(--mist) 0%,#c2d4cb 46%,var(--sand-soft) 100%);
  box-shadow:inset 0 0 0 1px rgba(19,33,29,.08);
}
.figure__media::after{
  content:"";position:absolute;left:0;right:0;bottom:26%;height:1px;
  background:linear-gradient(90deg,transparent,rgba(11,93,78,.24),transparent);
  pointer-events:none;
}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure--wide .figure__media{aspect-ratio:21 / 9}
.figure--portrait .figure__media{aspect-ratio:4 / 5}
.figure__caption{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:rgba(19,33,29,.55)}

/* ---------- 信息块与标签 ---------- */
.panel{
  padding:clamp(18px,2.4vw,28px);
  border-radius:var(--r-lg);
  background:var(--white);
  border:1px solid var(--line);
  box-shadow:var(--shadow-soft);
  min-width:0;
}
.panel--mist{background:var(--mist);border-color:rgba(11,93,78,.14);box-shadow:none}
.panel--sand{background:var(--sand-soft);border-color:rgba(184,134,45,.32);box-shadow:none}
.panel--ink{background:var(--ink);color:var(--paper);border-color:transparent;box-shadow:none}
.panel--ink .lede,.panel--ink p{color:rgba(250,246,234,.78)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:.28em .82em;border-radius:var(--r-pill);
  font-size:11.5px;letter-spacing:.1em;
  background:var(--mist);color:var(--green);border:1px solid rgba(11,93,78,.18);
}
.tag--gold{background:var(--sand-soft);color:#6b4c12;border-color:rgba(184,134,45,.3)}
.tag--violet{background:rgba(90,74,120,.12);color:var(--violet);border-color:rgba(90,74,120,.28)}
.tag--wind{background:rgba(46,111,125,.12);color:var(--wind);border-color:rgba(46,111,125,.28)}

/* ---------- 页面内目录（章节高亮） ---------- */
.anchor-nav{display:grid;gap:4px;font-size:13.5px}
.anchor-nav__link{
  display:flex;align-items:center;gap:10px;
  padding:9px 14px;border-left:2px solid var(--line);
  color:rgba(19,33,29,.62);border-radius:0 var(--r-sm) var(--r-sm) 0;
  transition:color .2s ease,background-color .2s ease,border-color .2s ease;
}
.anchor-nav__link:hover{color:var(--ink);background:rgba(216,227,221,.5);border-left-color:var(--sand)}
.anchor-nav__link[aria-current="true"]{
  color:var(--green);font-weight:600;background:rgba(11,93,78,.07);border-left-color:var(--green);
}

/* ---------- 跳至主要内容 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:.72em 1.25em;border-radius:var(--r-pill);
  background:var(--ink);color:var(--paper);
  font-size:14px;font-weight:600;letter-spacing:.06em;
  transform:translateY(-180%);
  transition:transform .22s ease;
}
.skip-link:focus-visible{transform:translateY(0);outline-color:var(--sand-soft)}

/* =========================================================
   头部：框架式导航
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(250,246,234,.95);
  backdrop-filter:blur(10px) saturate(1.15);
  -webkit-backdrop-filter:blur(10px) saturate(1.15);
  border-bottom:1px solid var(--line);
}
.site-header::before{
  content:"";display:block;height:4px;
  background:linear-gradient(90deg,var(--green) 0 40%,var(--sand) 40% 66%,var(--sand-soft) 66% 84%,var(--violet) 84% 100%);
}
.header__top{padding-block:8px}
.header__bar{
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  min-height:60px;
}
.brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand__mark{
  display:grid;place-items:center;flex:none;
  width:44px;height:44px;border-radius:var(--r-pill);
  background:var(--green);color:var(--paper);
  font-family:var(--font-display);font-size:21px;font-weight:700;line-height:1;
  box-shadow:inset 0 0 0 1px rgba(250,246,234,.3);
}
.brand__text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand__line{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(17px,1.5vw,20px);letter-spacing:.03em;color:var(--ink);white-space:nowrap;
}
.brand__descriptor{
  font-size:11.5px;letter-spacing:.14em;color:rgba(19,33,29,.58);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.header__aside{margin-left:auto;display:flex;align-items:center;gap:14px}
.header__meta{display:flex;align-items:center;gap:10px;font-size:12px;color:rgba(19,33,29,.6);max-width:none}
.header__version{
  padding:.3em .78em;border-radius:var(--r-pill);
  background:var(--mist);color:var(--green);
  border:1px solid rgba(11,93,78,.18);
  font-size:11.5px;letter-spacing:.08em;white-space:nowrap;
}
.header__dot{width:5px;height:5px;border-radius:50%;background:var(--sand);flex:none}
.header__site{font-size:11.5px;letter-spacing:.06em;color:rgba(19,33,29,.52);white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 15px;border-radius:var(--r-pill);
  border:1px solid var(--line-strong);background:var(--white);color:var(--ink);
  font-size:13px;font-weight:600;letter-spacing:.1em;
  transition:border-color .2s ease,background-color .2s ease;
}
.nav-toggle:hover{border-color:var(--green);background:var(--mist)}
.nav-toggle__box{display:grid;gap:4px;width:18px}
.nav-toggle__bar{display:block;height:2px;border-radius:2px;background:var(--ink);transition:transform .24s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child{transform:translateY(-3px) rotate(-45deg)}

.site-nav{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(216,227,221,.55),rgba(250,246,234,.92));
}
.site-nav__inner{display:flex;align-items:stretch;justify-content:space-between;gap:var(--gap)}
.site-nav__list{display:flex;align-items:stretch;flex-wrap:nowrap;border-left:1px solid var(--line)}
.site-nav__item{display:flex;border-right:1px solid var(--line)}
.site-nav__link{
  position:relative;display:flex;align-items:center;gap:9px;
  padding:13px clamp(12px,1.5vw,22px);
  color:var(--ink);font-size:14.5px;letter-spacing:.05em;white-space:nowrap;
  transition:background-color .2s ease,color .2s ease;
}
.site-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--sand);transform:scaleX(0);transform-origin:left;
  transition:transform .24s ease;
}
.site-nav__link:hover{background:rgba(216,227,221,.9)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__index{font-size:10.5px;letter-spacing:.12em;color:rgba(19,33,29,.42);transition:color .2s ease}
.site-nav__label{white-space:nowrap}
.site-nav__link[aria-current="page"]{background:var(--green);color:var(--paper)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(0)}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--sand-soft)}
.site-nav__note{
  display:flex;align-items:center;
  font-size:10.5px;letter-spacing:.22em;color:rgba(19,33,29,.42);white-space:nowrap;
}

.read-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:3px;
  background:rgba(19,33,29,.08);pointer-events:none;
}
.read-progress__bar{
  display:block;width:0;height:100%;
  background:linear-gradient(90deg,var(--green),var(--sand));
  transition:width .12s linear;
}

/* =========================================================
   页脚：深墨青底页
   ========================================================= */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,8vw,120px);
  padding-block:clamp(40px,5vw,68px) 24px;
  background:var(--ink);
  color:rgba(250,246,234,.84);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto;height:4px;
  background:linear-gradient(90deg,var(--sand) 0 34%,var(--green) 34% 70%,var(--violet) 70% 100%);
}
.footer__frame{
  position:absolute;top:-90px;right:-70px;width:320px;height:320px;
  border-radius:50%;border:1px solid rgba(216,227,221,.16);pointer-events:none;
}
.footer__frame::after{
  content:"";position:absolute;inset:56px;border-radius:50%;
  border:1px solid rgba(234,217,182,.14);
}
.footer__top{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 22px;
  padding-bottom:clamp(22px,3vw,34px);
  border-bottom:1px solid var(--line-paper);
}
.footer__wordmark{
  font-family:var(--font-display);font-weight:700;
  font-size:clamp(26px,3.4vw,40px);letter-spacing:.03em;color:var(--paper);
}
.footer__tagline{font-size:12.5px;letter-spacing:.14em;color:rgba(250,246,234,.6)}
.footer__version{
  margin-left:auto;font-size:11px;letter-spacing:.2em;
  color:var(--sand-soft);border:1px solid rgba(234,217,182,.3);
  padding:.34em .85em;border-radius:var(--r-pill);white-space:nowrap;
}
.footer__grid{
  display:grid;
  grid-template-columns:minmax(0,.9fr) minmax(0,.9fr) minmax(0,1.4fr);
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(26px,4vw,44px);
}
.footer__col{min-width:0}
.footer__heading{
  display:flex;align-items:center;gap:9px;
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--sand-soft);
}
.footer__heading::before{content:"";width:14px;height:1px;background:var(--sand)}
.footer__list{display:grid;gap:9px}
.footer__link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14.5px;color:rgba(250,246,234,.82);
  transition:color .2s ease,transform .2s ease;
}
.footer__link::before{content:"";width:0;height:1px;background:var(--sand);transition:width .2s ease}
.footer__link:hover{color:var(--paper);transform:translateX(3px)}
.footer__link:hover::before{width:12px}
.footer__contact{display:grid;gap:14px}
.contact-line{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  gap:3px 12px;align-items:center;
  padding-bottom:12px;border-bottom:1px dashed rgba(250,246,234,.16);
}
.contact-line:last-child{border-bottom:0;padding-bottom:0}
.contact-line__label{grid-column:1 / -1;font-size:10.5px;letter-spacing:.18em;color:rgba(250,246,234,.5)}
.contact-line__value{font-size:14px;color:var(--paper);word-break:break-all;letter-spacing:.02em}
.contact-line--address .contact-line__value{font-size:13.5px;line-height:1.65;word-break:normal;color:rgba(250,246,234,.9)}
.copy-btn{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;
  padding:.34em .72em;border-radius:var(--r-pill);
  border:1px solid rgba(250,246,234,.28);color:rgba(250,246,234,.8);
  transition:border-color .2s ease,color .2s ease,background-color .2s ease;
}
.copy-btn:hover{border-color:var(--sand-soft);color:var(--paper);background:rgba(234,217,182,.14)}
.copy-btn[data-copied="true"]{border-color:var(--sand);color:var(--sand-soft);background:rgba(234,217,182,.18)}
.copy-btn[data-copied="false"]{border-color:var(--orange);color:#f0a373}
.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 26px;
  padding-top:18px;border-top:1px solid var(--line-paper);
  font-size:12.5px;color:rgba(250,246,234,.6);
}
.footer__legal,.footer__icp{max-width:none}
.footer__icp{letter-spacing:.08em;color:rgba(250,246,234,.62)}
.footer__note{
  flex-basis:100%;font-size:11.5px;letter-spacing:.05em;
  color:rgba(250,246,234,.46);max-width:80ch;
}

/* ---------- 显现动效 ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .6s ease,transform .6s ease;
}
html[data-js="on"] [data-reveal][data-revealed]{opacity:1;transform:none}

/* =========================================================
   响应式
   ========================================================= */
@media (max-width:1180px){
  .header__site{display:none}
}
@media (max-width:1080px){
  .header__meta{display:none}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-header{position:sticky}
  .header__bar{min-height:56px;gap:10px}
  .site-nav{
    display:none;
    border-top:1px solid var(--line);
    background:var(--paper);
  }
  .site-nav[data-open],
  .site-header[data-open] .site-nav{
    display:block;
    animation:nav-drop .26s ease both;
  }
  @keyframes nav-drop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
  .site-nav__inner{
    flex-direction:column;align-items:stretch;
    padding-block:6px 16px;gap:0;
  }
  .site-nav__list{flex-direction:column;border-left:0}
  .site-nav__item{border-right:0;border-top:1px solid var(--line)}
  .site-nav__item:first-child{border-top:0}
  .site-nav__link{
    justify-content:flex-start;width:100%;
    padding:14px 2px;font-size:16px;letter-spacing:.06em;
  }
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{
    padding-inline:14px;border-radius:var(--r-sm);background:var(--green);color:var(--paper);
  }
  .site-nav__note{display:none}

  .grid--2,.grid--3,.grid--4,.grid--split{grid-template-columns:minmax(0,1fr)}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__col--contact{grid-column:1 / -1}
  .footer__version{margin-left:0}
}
@media (min-width:901px) and (max-width:1120px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .brand__descriptor{display:none}
  .brand__mark{width:40px;height:40px;font-size:19px}
  .nav-toggle{padding:8px 12px;font-size:12px;letter-spacing:.06em}
  .footer__grid{grid-template-columns:minmax(0,1fr)}
  .footer__col--contact{grid-column:auto}
  .footer__top{gap:4px 14px}
  .contact-line__value{word-break:break-word}
  .figure__media{border-radius:var(--r-md)}
}

/* ---------- 动效与可读性偏好 ---------- */
@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[data-js="on"] [data-reveal]{opacity:1;transform:none}
  .site-nav[data-open],.site-header[data-open] .site-nav{animation:none}
  .brand__mark,.read-progress__bar{transition:none}
}