/* ============================================================
   利国际平台 · 共享样式表 /assets/site.css
   工业档案感：深墨蓝底 + 金铜强调 + 朱砂锚点 + 纸张叠层
   ============================================================ */

:root{
  --ink:#0F1E2E;
  --ink-2:#16283B;
  --ink-line:#1F3548;
  --ink-text:#C9D4DF;
  --ink-muted:#8FA3B8;
  --bronze:#B8791F;
  --bronze-lt:#D9A441;
  --bronze-dk:#8C5A16;
  --cinnabar:#C0432B;
  --paper:#E8E2D8;
  --card:#F4F0E9;
  --muted:#6B7683;
  --text:#2B2B2B;
  --white:#FFFFFF;
  --line:rgba(43,43,43,.16);
  --line-strong:rgba(43,43,43,.32);
  --shell:1240px;
  --gutter:clamp(16px,4.2vw,48px);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Heiti SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-serif:"Songti SC","Source Han Serif SC","Noto Serif SC","SimSun","STSong",serif;
  --font-mono:"DIN Alternate",ui-monospace,SFMono-Regular,"Cascadia Mono",Consolas,"Liberation Mono","Courier New",monospace;
  --r:2px;
  --dur:.24s;
  --shadow-1:0 1px 2px rgba(15,30,46,.07),0 12px 28px -22px rgba(15,30,46,.55);
  --shadow-2:0 18px 40px -28px rgba(15,30,46,.75);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:clamp(16px,1.02vw,17px);
  line-height:1.7;
  color:var(--text);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{font-weight:900;line-height:1.18;letter-spacing:-.01em;color:var(--ink);margin:0 0 .6em}
h1{font-size:clamp(30px,4.4vw,54px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(20px,2.2vw,26px)}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.25em}
a{color:var(--bronze-dk);text-decoration:none}
a:hover{color:var(--bronze)}
::selection{background:var(--bronze-lt);color:var(--ink)}
:focus-visible{outline:3px solid var(--bronze-lt);outline-offset:2px;border-radius:var(--r)}
.section--paper :focus-visible,.section--card :focus-visible{outline-color:var(--bronze-dk)}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 骨架容器 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:12px;top:-64px;z-index:140;
  background:var(--bronze-lt);color:var(--ink);
  padding:10px 16px;font-weight:800;font-size:14px;
  border-radius:var(--r);letter-spacing:.02em;
  transition:top var(--dur) ease;
}
.skip-link:focus{top:12px;color:var(--ink)}

/* ============================================================
   页眉：双层信息导航
   ============================================================ */
.site-header{position:sticky;top:0;z-index:90;background:var(--ink)}

.topbar{
  background:var(--ink-2);
  border-bottom:1px solid var(--ink-line);
  max-height:56px;
  overflow:hidden;
  transition:max-height var(--dur) ease,opacity var(--dur) ease;
}
.site-header[data-scrolled] .topbar{max-height:0;opacity:0}
.topbar__inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:18px;min-height:36px;padding-block:4px;
}
.topbar__meta{
  margin:0;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;
  color:var(--ink-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.topbar__note{
  margin:0;font-size:12.5px;font-weight:700;letter-spacing:.14em;
  color:var(--bronze-lt);white-space:nowrap;
}

.navbar{position:relative;background:var(--ink);border-bottom:1px solid var(--ink-line)}
.navbar__inner{
  display:flex;align-items:center;flex-wrap:nowrap;
  gap:clamp(12px,2vw,28px);
  min-height:70px;padding-block:10px;
}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--white)}
.brand:hover{color:var(--white)}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:42px;height:42px;
  background:linear-gradient(158deg,var(--bronze-lt) 0%,var(--bronze) 48%,var(--bronze-dk) 100%);
  color:var(--ink);font-weight:900;font-size:22px;line-height:1;
  border:1px solid var(--bronze-dk);border-radius:var(--r);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.24),0 6px 16px -10px rgba(0,0,0,.7);
}
.brand__mark--lg{width:46px;height:46px;font-size:24px}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-size:20px;font-weight:900;letter-spacing:.02em}
.brand__sub{font-size:11px;letter-spacing:.2em;color:var(--ink-muted);margin-top:3px}

.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  background:transparent;border:1px solid var(--ink-line);color:var(--white);
  padding:9px 12px;font-size:14px;font-weight:700;letter-spacing:.1em;
  border-radius:var(--r);cursor:pointer;
  transition:border-color var(--dur) ease,color var(--dur) ease;
}
.nav-toggle:hover{border-color:var(--bronze);color:var(--bronze-lt)}
.nav-toggle__bars{
  position:relative;width:18px;height:2px;background:currentColor;
  transition:background-color var(--dur) ease;
}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;
  transition:transform var(--dur) ease,top var(--dur) ease;
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle__label{font-size:13px}

.nav{display:flex;align-items:center;gap:clamp(8px,1.4vw,18px);margin-left:auto}
.nav__list{
  display:flex;align-items:center;gap:2px;
  list-style:none;margin:0;padding:0;
  counter-reset:navidx;
}
.nav__item{counter-increment:navidx}
.nav__link{
  position:relative;display:inline-flex;align-items:baseline;
  padding:11px 13px;border-radius:var(--r);
  color:var(--ink-text);font-size:15px;font-weight:600;letter-spacing:.02em;
  transition:color var(--dur) ease,background-color var(--dur) ease;
}
.nav__link::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);font-size:10.5px;font-weight:700;
  color:var(--bronze);opacity:.75;margin-right:.55em;letter-spacing:0;
}
.nav__link::after{
  content:"";position:absolute;left:13px;right:13px;bottom:6px;height:2px;
  background:var(--bronze-lt);transform:scaleX(0);transform-origin:left;
  transition:transform var(--dur) ease;
}
.nav__link:hover{color:var(--white);background:var(--ink-2)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--bronze-lt);background:rgba(184,121,31,.14)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__cta{flex:0 0 auto;margin-left:6px}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(184,121,31,.16);overflow:hidden;
}
.scroll-progress::after{
  content:"";display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--bronze-dk),var(--bronze),var(--bronze-lt));
  transform:scaleX(var(--p,0));transform-origin:left;
  transition:transform .08s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  background:var(--ink);color:var(--ink-text);
  margin-top:clamp(48px,7vw,96px);
  border-top:4px solid var(--bronze);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.07);
}
.footer__top{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.3fr;
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(38px,6vw,72px) clamp(28px,4vw,48px);
}
.footer__col--brand{max-width:44ch}
.footer__brandline{
  display:flex;align-items:center;gap:12px;
  margin:0 0 16px;font-size:17px;font-weight:900;letter-spacing:.02em;color:var(--white);
}
.footer__desc{margin:0;color:var(--ink-muted);font-size:14.5px;line-height:1.75}
.footer__desc+.footer__desc{margin-top:12px}
.footer__title{
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.18em;color:var(--bronze-lt);
}
.footer__navlist{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.footer__navlist a{
  display:inline-block;padding:6px 0;font-size:15px;font-weight:600;
  color:var(--ink-text);border-bottom:1px solid transparent;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.footer__navlist a:hover{color:var(--bronze-lt);border-bottom-color:var(--bronze)}
.footer__navlist a[aria-current="page"]{color:var(--bronze-lt)}
.footer__contact{list-style:none;margin:0 0 16px;padding:0;display:grid;gap:12px}
.footer__contact-item{display:grid;gap:3px}
.footer__contact-label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;
  color:var(--bronze);font-weight:700;
}
.footer__contact-value{font-size:14.5px;font-weight:600;color:var(--white);word-break:break-word}
.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 24px;
  padding-block:18px;
  border-top:1px solid var(--ink-line);
  font-size:13px;color:var(--ink-muted);
}
.footer__version{margin:0;font-family:var(--font-mono);letter-spacing:.02em}
.footer__legal{margin:0;display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.footer__legal a{
  color:var(--ink-text);border-bottom:1px solid var(--ink-line);padding-bottom:1px;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.footer__legal a:hover{color:var(--bronze-lt);border-bottom-color:var(--bronze-lt)}
.footer__sep{color:var(--ink-line)}
.to-top{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;border:1px solid var(--ink-line);color:var(--ink-text);
  font-size:13px;font-weight:700;letter-spacing:.08em;
  padding:8px 14px;border-radius:var(--r);cursor:pointer;
  transition:border-color var(--dur) ease,color var(--dur) ease;
}
.to-top:hover{border-color:var(--bronze-lt);color:var(--bronze-lt)}

/* ============================================================
   通用按钮
   ============================================================ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.74em 1.2em;border:1px solid transparent;border-radius:var(--r);
  font-size:15px;font-weight:800;letter-spacing:.02em;line-height:1.2;
  cursor:pointer;text-align:center;
  transition:background-color var(--dur) ease,color var(--dur) ease,border-color var(--dur) ease,transform var(--dur) ease;
}
.btn:active{transform:translateY(1px)}
.btn--bronze{
  background:linear-gradient(180deg,var(--bronze) 0%,var(--bronze-dk) 100%);
  color:var(--white);border-color:var(--bronze-dk);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.22);
}
.btn--bronze:hover{background:var(--bronze-lt);color:var(--ink);border-color:var(--bronze)}
.btn--outline{border-color:var(--line-strong);color:var(--ink);background:transparent}
.btn--outline:hover{border-color:var(--bronze);color:var(--bronze-dk);background:rgba(184,121,31,.07)}
.btn--ghost{border-color:var(--ink-line);color:var(--ink-text);background:transparent}
.btn--ghost:hover{border-color:var(--bronze-lt);color:var(--bronze-lt);background:rgba(217,164,65,.08)}
.btn--block{width:100%}

/* ============================================================
   分区与章节
   ============================================================ */
.section{padding-block:clamp(40px,6vw,84px)}
.section--paper{background:var(--paper)}
.section--card{background:var(--card)}
.section--band{background:var(--ink-2);color:var(--ink-text)}
.section--dark{background:var(--ink);color:var(--ink-text)}
.section--dark h1,.section--dark h2,.section--dark h3,.section--dark h4{color:var(--white)}
.section--dark a{color:var(--bronze-lt)}
.section--dark a:hover{color:var(--white)}
.kicker{
  display:inline-flex;align-items:center;gap:10px;
  margin:0 0 14px;font-family:var(--font-mono);font-size:12px;font-weight:700;
  letter-spacing:.2em;color:var(--bronze-dk);
}
.kicker::before{content:"";width:26px;height:2px;background:var(--bronze);display:inline-block}
.section--dark .kicker,.section--band .kicker{color:var(--bronze-lt)}
.section--dark .kicker::before,.section--band .kicker::before{background:var(--bronze-lt)}
.section-title{margin:0 0 14px;font-size:clamp(26px,3.4vw,40px)}
.section-lede{max-width:64ch;margin:0;color:var(--muted);font-size:16.5px}
.section--dark .section-lede,.section--band .section-lede{color:var(--ink-muted)}
.paper-lines{
  background-color:var(--paper);
  background-image:linear-gradient(0deg,rgba(15,30,46,.04) 1px,transparent 1px);
  background-size:100% 30px;
}
.num{font-family:var(--font-mono);font-weight:700;letter-spacing:.02em;font-variant-numeric:tabular-nums}

/* ============================================================
   网格
   ============================================================ */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.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--rail{grid-template-columns:minmax(0,3fr) minmax(0,9fr)}
.grid--rail-4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.rail{position:sticky;top:96px;align-self:start}

/* ============================================================
   基础组件
   ============================================================ */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  padding:clamp(18px,2.4vw,28px);box-shadow:var(--shadow-1);
  transition:transform var(--dur) ease,border-color var(--dur) ease,box-shadow var(--dur) ease;
}
.card:hover{transform:translateY(-3px);border-color:var(--bronze);box-shadow:var(--shadow-2)}
.section--dark .card,.section--band .card{background:var(--ink-2);border-color:var(--ink-line);color:var(--ink-text)}
.section--dark .card:hover,.section--band .card:hover{border-color:var(--bronze-lt)}
.card__no{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--cinnabar);margin-bottom:10px}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--line-strong);border-radius:var(--r);
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;letter-spacing:.1em;
  color:var(--muted);background:transparent;
}
.tag--bronze{border-color:var(--bronze);color:var(--bronze-dk)}
.tag--cinnabar{border-color:var(--cinnabar);color:var(--cinnabar)}
.tag--ink{border-color:var(--ink-line);color:var(--ink-muted);background:rgba(255,255,255,.03)}

.stamp{
  display:inline-grid;place-items:center;
  width:64px;height:64px;border:2px solid var(--cinnabar);border-radius:var(--r);
  color:var(--cinnabar);font-weight:900;font-size:13px;letter-spacing:.1em;line-height:1.2;
  transform:rotate(-6deg);opacity:.9;text-align:center;
}

.clause{
  border-left:3px solid var(--bronze);background:var(--card);
  padding:16px 18px;font-size:14px;line-height:1.8;color:var(--text);
}
.clause+.clause{margin-top:12px}
.clause__no{font-family:var(--font-mono);font-weight:700;color:var(--cinnabar);margin-right:.5em}

.table-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.ledger{width:100%;border-collapse:collapse;background:var(--card);font-size:15px;min-width:560px}
.ledger caption{
  text-align:left;padding-bottom:10px;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.14em;color:var(--muted);
}
.ledger th,.ledger td{
  padding:13px 14px;border-bottom:1px solid var(--line);
  text-align:left;vertical-align:top;
}
.ledger thead th{
  background:var(--ink);color:var(--white);
  font-size:12.5px;font-weight:800;letter-spacing:.08em;
  border-bottom:2px solid var(--bronze);
}
.ledger tbody tr{transition:background-color var(--dur) ease}
.ledger tbody tr:hover{background:rgba(184,121,31,.09)}
.ledger td .num{color:var(--bronze-dk)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px;
  list-style:none;margin:0;padding:16px 0;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--muted);
}
.breadcrumbs li{display:flex;align-items:center;gap:6px}
.breadcrumbs li::after{content:"/";color:var(--line-strong)}
.breadcrumbs li:last-child::after{content:""}
.breadcrumbs a{color:var(--muted)}
.breadcrumbs a:hover{color:var(--bronze)}
.breadcrumbs [aria-current="page"]{color:var(--text)}

.prose{max-width:72ch;font-size:17px}
.prose p{margin:0 0 1.1em}
.prose h2{margin:1.9em 0 .6em;font-size:clamp(22px,2.4vw,28px)}
.prose h3{margin:1.6em 0 .5em;font-size:19px}
.prose ul,.prose ol{padding-left:1.3em}
.prose li{margin-bottom:.4em}
.prose strong{color:var(--ink)}
.prose a{border-bottom:1px solid rgba(184,121,31,.5)}

/* ---------- 图片与档案框 ---------- */
.media{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--r);
  background:var(--card);box-shadow:var(--shadow-1);
}
.media img,.media__img{width:100%;height:100%;object-fit:cover}
.media__label{
  position:absolute;left:0;bottom:0;
  background:var(--ink);color:var(--bronze-lt);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  padding:6px 10px;
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--3x2{aspect-ratio:3/2}
.media--1x1{aspect-ratio:1/1}
.media--3x4{aspect-ratio:3/4}
.figure{margin:0}
.figure__caption{
  margin-top:10px;padding-left:10px;border-left:2px solid var(--bronze);
  font-size:13px;line-height:1.7;color:var(--muted);
}

/* ---------- 滚动显现 ---------- */
[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1100px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--rail,.grid--rail-4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
}
@media (max-width:980px){
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;gap:0;
    margin:0;padding:8px var(--gutter) 22px;
    background:var(--ink-2);
    border-bottom:3px solid var(--bronze);
    box-shadow:var(--shadow-2);
    max-height:calc(100vh - 120px);overflow-y:auto;
  }
  .nav[data-open]{display:flex}
  .nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%;border-top:1px solid var(--ink-line)}
  .nav__item{border-bottom:1px dashed var(--ink-line)}
  .nav__link{display:flex;width:100%;padding:14px 2px;font-size:16px;border-radius:0}
  .nav__link::after{left:2px;right:auto;width:30px;bottom:9px}
  .nav__link:hover,.nav__link[aria-current="page"]{background:transparent}
  .nav__cta{width:100%;margin:18px 0 0}
  .grid--3,.grid--rail,.grid--rail-4-8{grid-template-columns:1fr}
  .rail{position:static}
  .footer__top{grid-template-columns:1fr 1fr;gap:32px}
  .footer__col--brand{grid-column:1 / -1;max-width:none}
}
@media (max-width:720px){
  html{scroll-padding-top:88px}
  .grid--2,.grid--4{grid-template-columns:1fr}
  .topbar__note{display:none}
  .footer__top{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:14px}
  .to-top{align-self:flex-start}
}
@media (max-width:560px){
  .brand__mark{width:38px;height:38px;font-size:20px}
  .brand__name{font-size:17px}
  .brand__sub{display:none}
  .navbar__inner{min-height:62px}
  .nav-toggle{padding:8px 10px}
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal]{opacity:1!important;transform:none!important}
  .card:hover{transform:none}
  .btn:active{transform:none}
}