/* =============================================================
   彩宝网品牌 · 共享样式 /assets/site.css
   档案墨黑 / 画册纸白 / 宝石红锚点 / 折射渐变
   ============================================================= */

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,picture,svg{max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
a{color:inherit;}

:root{
  --ink:#0B0F14;
  --ink-2:#121A23;
  --paper:#F4F1EA;
  --white:#FFFFFF;
  --ruby:#E63B5A;
  --ruby-soft:#FFB9C6;
  --sea:#102A43;
  --amber:#D9A24B;
  --emerald:#1F8A5B;
  --graphite:#5C6675;
  --line:#C9CED6;
  --refract:linear-gradient(135deg,#0B0F14 0%,#102A43 48%,#2A1230 100%);
  --shell:min(1360px,calc(100% - 2.5rem));
  --edge:clamp(1.25rem,4vw,3.5rem);
  --cut:18px;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Consolas,"Courier New",monospace;
}

body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.005em;
  overflow-x:hidden;
}
::selection{background:rgba(230,59,90,.42);color:#fff;}

:focus-visible{outline:2px solid var(--amber);outline-offset:3px;}

#main-content{display:block;}

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

/* ---------- 布局外壳 ---------- */
.container{width:var(--shell);margin-inline:auto;}
.section{padding:clamp(3rem,7vw,6.5rem) 0;}
.grid-12{
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(1rem,2.4vw,2rem);
}
.col-3{grid-column:span 3;}
.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;}

.rule{
  height:1px;border:0;margin:clamp(1.5rem,4vw,2.75rem) 0;
  background:linear-gradient(90deg,rgba(201,206,214,.42),rgba(201,206,214,0));
}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  color:var(--paper);
  background:rgba(11,15,20,.9);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border-bottom:1px solid rgba(201,206,214,.16);
}
.site-header.is-scrolled{
  background:rgba(11,15,20,.975);
  border-bottom-color:rgba(230,59,90,.42);
}

.refract-rail{position:relative;height:2px;background:rgba(201,206,214,.14);overflow:hidden;}
.refract-rail__fill{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--ruby) 0%,var(--amber) 55%,var(--emerald) 100%);
  transition:transform .12s linear;
}

.skip-link{
  position:absolute;left:var(--edge);top:-5rem;z-index:200;
  padding:.7rem 1.15rem;background:var(--ruby);color:var(--white);
  font-size:.86rem;font-weight:600;letter-spacing:.06em;text-decoration:none;
  transition:top .25s ease;
}
.skip-link:focus{top:1rem;}

.header-inner{width:var(--shell);margin-inline:auto;}

.header-rail{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.55rem 0;
  border-bottom:1px solid rgba(201,206,214,.12);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
}
.rail-index{color:var(--amber);}
.rail-utils{display:flex;align-items:center;gap:1.3rem;}
.rail-utils a{
  position:relative;display:inline-block;padding-bottom:2px;
  color:var(--graphite);text-decoration:none;
  transition:color .25s ease;
}
.rail-utils a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;
  background:var(--ruby);transition:right .28s cubic-bezier(.2,.7,.3,1);
}
.rail-utils a:hover,.rail-utils a:focus-visible{color:var(--paper);}
.rail-utils a:hover::after,.rail-utils a:focus-visible::after{right:0;}

.header-bar{
  display:flex;align-items:center;gap:clamp(.75rem,2.5vw,2rem);
  padding:.85rem 0 1rem;
}

.brand{
  display:inline-flex;align-items:center;gap:.7rem;
  color:var(--paper);text-decoration:none;flex:none;
}
.brand__mark{
  width:36px;height:36px;flex:none;display:grid;place-items:center;
  font-family:var(--font-serif);font-weight:700;font-size:1.08rem;line-height:1;
  color:var(--white);background:var(--refract);
  border:1px solid rgba(217,162,75,.55);
  clip-path:polygon(25% 0,100% 0,100% 75%,75% 100%,0 100%,0 25%);
}
.brand__text{display:flex;flex-direction:column;min-width:0;}
.brand__name{
  display:block;font-weight:800;font-size:1.02rem;line-height:1.15;
  letter-spacing:.01em;color:var(--white);
}
.brand__tag{
  display:block;margin-top:3px;
  font-family:var(--font-mono);font-size:10px;line-height:1;
  letter-spacing:.26em;color:var(--amber);
}
.brand--footer{align-items:flex-start;margin-bottom:1.1rem;}

.site-nav{margin-left:auto;}
.site-nav__list{
  display:flex;align-items:center;
  gap:clamp(.5rem,1.6vw,1.5rem);
}
.site-nav__list a{
  position:relative;display:inline-block;
  padding:.45rem .1rem .55rem;
  font-size:.92rem;font-weight:500;
  color:rgba(244,241,234,.76);text-decoration:none;
  transition:color .25s ease;
}
.site-nav__list a::after{
  content:"";position:absolute;left:0;bottom:.1rem;width:100%;height:2px;
  background:linear-gradient(90deg,var(--ruby),var(--amber));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .28s cubic-bezier(.2,.7,.3,1);
}
.site-nav__list a:hover,.site-nav__list a:focus-visible{color:var(--white);}
.site-nav__list a:hover::after,.site-nav__list a:focus-visible::after{transform:scaleX(1);}
.site-nav__list a[aria-current="page"]{color:var(--white);font-weight:700;}
.site-nav__list a[aria-current="page"]::after{transform:scaleX(1);}

.header-actions{display:flex;align-items:center;gap:.7rem;flex:none;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.75rem 1.2rem;border:1px solid transparent;
  font-family:var(--font-sans);font-size:.86rem;font-weight:600;letter-spacing:.05em;
  text-decoration:none;cursor:pointer;background:transparent;color:var(--paper);
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:background-color .25s ease,color .25s ease,border-color .25s ease,transform .25s ease;
}
.btn:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--amber);}
.btn--ruby{background:var(--ruby);color:var(--white);}
.btn--ruby:hover{background:#F0516E;transform:translateY(-1px);}
.btn--ghost{border-color:rgba(201,206,214,.42);color:var(--paper);}
.btn--ghost:hover{border-color:var(--amber);color:var(--amber);}
.btn--line{border-color:var(--ruby);color:var(--ruby-soft);}
.btn--line:hover{background:rgba(230,59,90,.14);color:var(--white);}

.link-arrow{
  display:inline-flex;align-items:center;gap:.45rem;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--amber);text-decoration:none;
  border-bottom:1px solid rgba(217,162,75,.45);padding-bottom:2px;
  transition:color .25s ease,border-color .25s ease;
}
.link-arrow::after{content:"→";transition:transform .25s ease;}
.link-arrow:hover{color:var(--white);border-color:var(--ruby);}
.link-arrow:hover::after{transform:translateX(4px);}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.62rem .8rem;
  background:transparent;border:1px solid rgba(201,206,214,.36);
  color:var(--paper);cursor:pointer;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
}
.nav-toggle__bars{
  position:relative;display:block;width:18px;height:2px;background:var(--amber);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--amber);
  transition:transform .28s ease,top .28s ease;
}
.nav-toggle__bars::before{top:-6px;}
.nav-toggle__bars::after{top:6px;}
.site-header[data-open] .nav-toggle__bars{background:transparent;}
.site-header[data-open] .nav-toggle__bars::before{top:0;transform:rotate(45deg);}
.site-header[data-open] .nav-toggle__bars::after{top:0;transform:rotate(-45deg);}

/* ---------- 面包屑 / 页头 ---------- */
.breadcrumbs{
  padding:1.1rem 0;
  border-bottom:1px solid rgba(201,206,214,.14);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:.55rem;}
.breadcrumbs li{display:inline-flex;align-items:center;gap:.55rem;color:var(--graphite);}
.breadcrumbs li+li::before{content:"／";color:rgba(217,162,75,.7);}
.breadcrumbs a{color:rgba(244,241,234,.64);text-decoration:none;transition:color .25s ease;}
.breadcrumbs a:hover{color:var(--white);}
.breadcrumbs [aria-current="page"]{color:var(--paper);}

.page-head{padding:clamp(2rem,6vw,4.5rem) 0 clamp(1.25rem,3vw,2rem);}
.page-head__index{
  display:block;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.3em;color:var(--amber);
}
.page-head__title{
  margin-top:.75rem;font-weight:900;
  font-size:clamp(2rem,5vw,3.6rem);line-height:1.02;letter-spacing:-.025em;
  color:var(--white);
}
.page-head__lede{
  margin-top:1rem;max-width:64ch;
  color:rgba(244,241,234,.72);font-size:1.02rem;line-height:1.8;
}

/* ---------- 编号章节 ---------- */
.section-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(1rem,3vw,2.5rem);align-items:end;
  margin-bottom:clamp(1.75rem,4vw,3rem);
  padding-bottom:1rem;
  border-bottom:1px solid rgba(201,206,214,.16);
}
.section-head__num{
  font-family:var(--font-serif);font-weight:700;
  font-size:clamp(2.4rem,5vw,4rem);line-height:.86;letter-spacing:-.02em;
  color:rgba(230,59,90,.3);
  -webkit-text-stroke:1px rgba(217,162,75,.55);
}
.section-head__title{
  font-size:clamp(1.25rem,2.4vw,1.9rem);font-weight:800;line-height:1.2;
  letter-spacing:-.015em;color:var(--white);
}

/* ---------- 面板 / 卡片 ---------- */
.panel{
  position:relative;
  padding:clamp(1.25rem,3vw,2rem);
  background:linear-gradient(160deg,rgba(16,42,67,.72),rgba(11,15,20,.92));
  border:1px solid rgba(201,206,214,.16);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
  transition:border-color .28s ease,transform .28s ease;
}
.panel:hover{border-color:rgba(217,162,75,.55);}
.panel--ruby{
  background:linear-gradient(150deg,rgba(230,59,90,.92),rgba(90,16,44,.9));
  border-color:rgba(255,185,198,.35);
}
.panel--paper{
  background:var(--paper);color:var(--ink);
  border-color:rgba(11,15,20,.12);
}
.panel__label{
  display:block;margin-bottom:.7rem;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--amber);
}
.panel--paper .panel__label{color:#8A6A22;}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.26rem .6rem;
  font-size:12px;font-weight:600;letter-spacing:.08em;line-height:1.4;
  color:rgba(244,241,234,.86);
  background:rgba(255,255,255,.05);
  border:1px solid rgba(201,206,214,.4);
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
}
.tag--ruby{border-color:rgba(230,59,90,.65);color:var(--ruby-soft);background:rgba(230,59,90,.12);}
.tag--amber{border-color:rgba(217,162,75,.62);color:#F0CE93;background:rgba(217,162,75,.1);}
.tag--emerald{border-color:rgba(31,138,91,.7);color:#8FE0BC;background:rgba(31,138,91,.14);}
.tag--paper{border-color:rgba(11,15,20,.25);color:var(--ink);background:var(--paper);}

/* ---------- 高亮隔离块 ---------- */
.callout{
  padding:1rem 1.25rem;
  border-left:3px solid var(--ruby);
  background:rgba(230,59,90,.08);
  color:rgba(244,241,234,.9);
}
.callout--amber{border-left-color:var(--amber);background:rgba(217,162,75,.09);}
.callout--emerald{border-left-color:var(--emerald);background:rgba(31,138,91,.1);}

/* ---------- 数据表 ---------- */
.data-list{display:grid;gap:.85rem;}
.data-list__row{
  display:flex;justify-content:space-between;align-items:baseline;gap:1rem;
  padding-bottom:.6rem;
  border-bottom:1px dashed rgba(201,206,214,.2);
}
.data-list__key{font-size:.88rem;color:var(--graphite);}
.data-list__val{
  font-family:var(--font-mono);font-size:.9rem;color:var(--paper);
  text-align:right;word-break:break-word;
}
.data-list__val--ruby{color:var(--ruby-soft);}
.data-list__val--emerald{color:#8FE0BC;}

/* ---------- 图片容器协议 ---------- */
.figure{
  position:relative;overflow:hidden;
  background:var(--refract);
  border:1px solid rgba(201,206,214,.18);
}
.figure>img,.figure>picture>img{
  display:block;width:100%;height:100%;object-fit:cover;
}
.figure--4x3{aspect-ratio:4/3;}
.figure--16x9{aspect-ratio:16/9;}
.figure--1x1{aspect-ratio:1/1;}
.figure--3x4{aspect-ratio:3/4;}
.figure--cut{
  clip-path:polygon(0 0,calc(100% - 26px) 0,100% 26px,100% 100%,0 100%);
}
.figure--glow::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(58% 52% at 74% 20%,rgba(230,59,90,.35),transparent 62%),
    radial-gradient(46% 42% at 20% 80%,rgba(217,162,75,.3),transparent 68%);
  mix-blend-mode:screen;
}
.figure--placeholder{
  display:grid;place-items:center;min-height:220px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  color:rgba(244,241,234,.5);
}
.figure__index{
  position:absolute;top:.7rem;left:.8rem;z-index:2;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--amber);
}
.figure__caption{
  margin-top:.6rem;
  font-size:.82rem;line-height:1.7;color:var(--graphite);
}

/* ---------- 显现动效 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.3,1);
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--ink);
  border-top:1px solid rgba(217,162,75,.3);
  color:var(--paper);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(120% 85% at 86% 0%,rgba(16,42,67,.95) 0%,rgba(42,18,48,.55) 38%,rgba(11,15,20,0) 72%),
    radial-gradient(70% 60% at 4% 100%,rgba(230,59,90,.16) 0%,rgba(11,15,20,0) 70%);
}
.footer-inner{
  position:relative;z-index:1;
  width:var(--shell);margin-inline:auto;
  padding:clamp(2.5rem,6vw,5rem) 0 1.75rem;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.65fr);
  gap:clamp(2rem,5vw,4.5rem);
  padding-bottom:clamp(1.75rem,4vw,3rem);
}
.footer-brand{max-width:38ch;}
.footer-brand__note{
  margin-bottom:1.4rem;
  font-size:.92rem;line-height:1.85;color:var(--graphite);
}

.footer-cols{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(1.25rem,3vw,2.5rem);
}
.footer-col__title{
  margin-bottom:1rem;
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.24em;color:var(--amber);
}
.footer-col__list{display:grid;gap:.6rem;}
.footer-col__list a{
  position:relative;display:inline-block;padding-bottom:2px;
  font-size:.94rem;color:rgba(244,241,234,.72);text-decoration:none;
  transition:color .25s ease;
}
.footer-col__list a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;
  background:var(--ruby);
  transition:right .28s cubic-bezier(.2,.7,.3,1);
}
.footer-col__list a:hover,.footer-col__list a:focus-visible{color:var(--white);}
.footer-col__list a:hover::after,.footer-col__list a:focus-visible::after{right:0;}

.footer-contact{
  display:flex;flex-wrap:wrap;gap:.9rem clamp(1.5rem,4vw,3rem);
  padding:1.35rem 0;
  border-top:1px dashed rgba(201,206,214,.22);
  border-bottom:1px dashed rgba(201,206,214,.22);
}
.footer-contact__item{display:flex;align-items:baseline;gap:.6rem;flex-wrap:wrap;}
.footer-contact__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--graphite);
}
.footer-contact__value{
  font-family:var(--font-mono);font-size:.86rem;color:rgba(244,241,234,.9);
  word-break:break-word;
}

.footer-base{
  display:flex;align-items:center;justify-content:space-between;
  gap:1rem;flex-wrap:wrap;padding-top:1.35rem;
}
.footer-base__meta{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--graphite);line-height:1.9;
}
.to-top{
  padding:.6rem 1rem;
  background:transparent;
  border:1px solid rgba(217,162,75,.5);
  color:var(--amber);cursor:pointer;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
  transition:background-color .25s ease,color .25s ease,border-color .25s ease;
}
.to-top:hover{background:var(--ruby);border-color:var(--ruby);color:var(--white);}

/* ---------- 响应式 ---------- */
@media (max-width:1100px){
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;margin:0;
    padding:1rem var(--edge) 1.5rem;
    background:rgba(11,15,20,.99);
    border-bottom:1px solid rgba(230,59,90,.4);
    box-shadow:0 24px 48px rgba(0,0,0,.5);
  }
  .site-header[data-open] .site-nav{display:block;}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .site-nav__list li{border-bottom:1px solid rgba(201,206,214,.14);}
  .site-nav__list li:last-child{border-bottom:0;}
  .site-nav__list a{
    display:block;padding:.95rem 0;font-size:1.02rem;
  }
  .site-nav__list a::after{bottom:.4rem;width:52px;}
}

@media (max-width:900px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 6;}
  .footer-top{grid-template-columns:minmax(0,1fr);}
  .footer-brand{max-width:none;}
}

@media (max-width:720px){
  body{font-size:16px;}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem 1.25rem;}
  .section-head{grid-template-columns:minmax(0,1fr);gap:.5rem;align-items:start;}
}

@media (max-width:600px){
  .rail-index{display:none;}
  .header-rail{justify-content:flex-start;}
  .rail-utils{gap:.9rem;font-size:10px;letter-spacing:.14em;}
  .header-bar{gap:.5rem;padding:.7rem 0 .85rem;}
  .brand__mark{width:30px;height:30px;font-size:.95rem;}
  .brand__name{font-size:.92rem;}
  .brand__tag{font-size:9px;letter-spacing:.18em;}
  .btn{padding:.6rem .8rem;font-size:.78rem;}
  .nav-toggle{padding:.55rem .6rem;letter-spacing:.12em;}
  .nav-toggle__label{display:none;}
  .grid-12{grid-template-columns:minmax(0,1fr);}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 1;}
  .panel{--cut:14px;}
}

@media (max-width:420px){
  .footer-cols{grid-template-columns:minmax(0,1fr);}
  .footer-contact{flex-direction:column;gap:.7rem;}
}

@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;transform:none;}
  .refract-rail__fill{transition:none;}
}