/* ============================================================
   博亚官网 · 共享样式 /assets/site.css
   山青 × 暖橙双色体系｜粗边框硬阴影｜目录型内容地图
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::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,svg,video{display:block;max-width:100%;}
a{color:inherit;}
button{font:inherit;color:inherit;background:none;border:0;}
input,select,textarea{font:inherit;color:inherit;}
table{border-collapse:collapse;}
:focus-visible{outline:3px solid var(--c-orange);outline-offset:2px;}

/* ---------- 2. 颜色与尺度变量 ---------- */
:root{
  --c-green:#16665A;
  --c-green-mid:#2C9C86;
  --c-mint:#E7F2EE;
  --c-mist:#F6FAF8;
  --c-orange:#E4762B;
  --c-orange-deep:#A8480F;
  --c-orange-soft:#FBE7D6;
  --c-ink:#12201E;
  --c-ink-2:#475A57;
  --c-stone:#8FA9A3;
  --c-line:#CFE0DB;
  --c-white:#FFFFFF;
  --c-footer-panel:#18302C;
  --timeline:linear-gradient(90deg,#16665A 0%,#2C9C86 55%,#E4762B 100%);
  --shadow-hard:6px 6px 0 var(--c-mint);
  --shadow-accent:6px 6px 0 var(--c-orange);
  --radius:2px;
  --w-container:1240px;
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--c-mist);
  color:var(--c-ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{line-height:1.22;letter-spacing:.02em;font-weight:900;}
.display{font-size:clamp(32px,5.2vw,56px);font-weight:900;line-height:1.1;letter-spacing:.02em;}
.display--xl{font-size:clamp(38px,7vw,72px);}
.lead{font-size:17px;line-height:1.8;color:var(--c-ink-2);}
.eyebrow{
  display:inline-block;
  font-size:13px;
  letter-spacing:.08em;
  font-weight:700;
  color:var(--c-green);
  padding-bottom:6px;
  border-bottom:2px solid var(--c-green-mid);
}
.prose{max-width:42em;color:var(--c-ink-2);line-height:1.85;}
.prose p+p{margin-top:14px;}
.muted{color:var(--c-ink-2);font-size:14px;}
.num{
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  font-weight:700;
  letter-spacing:.01em;
}

/* ---------- 4. 布局 ---------- */
.container{width:100%;max-width:var(--w-container);margin:0 auto;padding:0 20px;}
@media (min-width:768px){.container{padding:0 32px;}}
.container--narrow{max-width:780px;}
.section{padding:56px 0;}
@media (min-width:768px){.section{padding:88px 0;}}
.section--tint{background:var(--c-mint);}
.section--deep{background:var(--c-green);color:#E3F1ED;}
.section--deep .lead,.section--deep .prose,.section--deep .muted{color:#BEDAD3;}
.grid{display:grid;gap:24px;}
.grid--split{grid-template-columns:1fr;}
.grid--halves{grid-template-columns:1fr;}
@media (min-width:640px){.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (min-width:960px){.grid--split{grid-template-columns:5fr 7fr;gap:36px;}}
.stack{display:grid;gap:var(--stack-gap,16px);}
.table-scroll{overflow-x:auto;}

/* ---------- 5. 按钮与胶囊 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  color:var(--c-ink);
  background:var(--c-white);
  border:2px solid var(--c-ink);
  border-radius:var(--radius);
  box-shadow:3px 3px 0 var(--c-ink);
  cursor:pointer;
  transition:transform .16s ease,box-shadow .16s ease,background-color .16s ease,color .16s ease;
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:5px 5px 0 var(--c-ink);}
.btn:active{transform:translate(1px,1px);box-shadow:1px 1px 0 var(--c-ink);}
.btn--accent{background:var(--c-orange);color:#fff;}
.btn--ghost{background:var(--c-white);color:var(--c-ink);}
.btn--ghost:hover{background:var(--c-orange-soft);}
.btn--green{background:var(--c-green);color:#fff;}
.btn--sm{padding:7px 13px;font-size:13px;box-shadow:2px 2px 0 var(--c-ink);}
.pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 14px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--c-ink);
  background:var(--c-white);
  border:2px solid var(--c-ink);
  border-radius:999px;
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease;
}
.pill:hover{background:var(--c-orange-soft);}
.pill[aria-pressed="true"]{background:var(--c-orange);color:#fff;}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--c-green);
  background:var(--c-white);
  border:2px solid var(--c-green-mid);
}
.breadcrumb{font-size:13px;letter-spacing:.06em;color:var(--c-ink-2);}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center;}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:var(--c-stone);}
.breadcrumb a{color:var(--c-green);text-decoration:none;border-bottom:1px solid var(--c-green-mid);}

/* ---------- 6. 页面基础组件 ---------- */
.chapter{margin-bottom:22px;}
.chapter__num{
  display:block;
  font-size:clamp(72px,13vw,160px);
  font-weight:900;
  line-height:.8;
  letter-spacing:-.03em;
  color:var(--c-mint);
  -webkit-text-stroke:2px var(--c-green);
  font-variant-numeric:tabular-nums;
}
@supports not ((-webkit-text-stroke:1px #000)){
  .chapter__num{color:var(--c-green);opacity:.32;}
}
.chapter__title{font-size:clamp(22px,3vw,34px);font-weight:900;margin-top:-6px;}
.chapter__lead{margin-top:10px;max-width:42em;color:var(--c-ink-2);}

.board{
  display:grid;
  gap:18px;
  padding:22px;
  background:var(--c-white);
  border:2px solid var(--c-ink);
  box-shadow:8px 8px 0 var(--c-mint);
}
.board__head{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  align-items:baseline;
  justify-content:space-between;
  padding-bottom:12px;
  border-bottom:2px dashed var(--c-stone);
}
.board__title{font-size:20px;font-weight:900;}
.board__summary{color:var(--c-ink-2);font-size:15.5px;}
.board__points{display:grid;gap:10px;}
.board__points li{position:relative;padding-left:22px;}
.board__points li::before{
  content:"";
  position:absolute;
  left:0;
  top:.68em;
  width:10px;
  height:10px;
  background:var(--c-green-mid);
  border:2px solid var(--c-ink);
}
.board__terms{display:grid;gap:10px;grid-template-columns:1fr;}
@media (min-width:640px){.board__terms{grid-template-columns:repeat(2,minmax(0,1fr));}}
.board__terms dt{font-weight:900;font-size:15px;}
.board__terms dd{color:var(--c-ink-2);font-size:14.5px;line-height:1.7;}
.board__more{font-size:14px;font-weight:700;}
.board__more a{color:var(--c-orange-deep);text-decoration:none;border-bottom:2px solid var(--c-orange);}

.card{
  display:grid;
  gap:12px;
  padding:20px;
  background:var(--c-white);
  border:2px solid var(--c-ink);
  box-shadow:var(--shadow-hard);
}
.card--accent{background:var(--c-orange-soft);box-shadow:var(--shadow-accent);}
.card__head{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;}
.card__title{font-size:18px;font-weight:900;}
.card__body{font-size:15px;color:var(--c-ink-2);line-height:1.75;}
.panel{padding:20px;background:var(--c-mint);border:2px solid var(--c-green-mid);}

.data-table{width:100%;font-size:15px;background:var(--c-white);border:2px solid var(--c-ink);}
.data-table caption{text-align:left;padding-bottom:10px;font-size:13px;letter-spacing:.06em;color:var(--c-ink-2);}
.data-table th,.data-table td{padding:12px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--c-line);}
.data-table thead th{background:var(--c-green);color:#fff;border-bottom:2px solid var(--c-ink);}
.data-table tbody tr:nth-child(even){background:var(--c-mint);}

.timeline{position:relative;padding-top:18px;}
.timeline__track{height:10px;background:var(--timeline);border:2px solid var(--c-ink);}
.timeline__nodes{
  display:flex;
  gap:16px;
  padding:20px 2px 8px;
  overflow-x:auto;
  scroll-snap-type:x proximity;
  -webkit-mask-image:linear-gradient(90deg,transparent 0,#000 4%,#000 96%,transparent 100%);
  mask-image:linear-gradient(90deg,transparent 0,#000 4%,#000 96%,transparent 100%);
}
.timeline__node{
  flex:0 0 clamp(200px,42vw,280px);
  scroll-snap-align:start;
  display:grid;
  gap:6px;
  padding:14px;
  background:var(--c-white);
  border:2px solid var(--c-ink);
  box-shadow:4px 4px 0 var(--c-stone);
}
.timeline__node--active{background:var(--c-orange-soft);box-shadow:4px 4px 0 var(--c-orange);}
.timeline__label{font-size:13px;letter-spacing:.06em;color:var(--c-ink-2);}

.stat{display:grid;gap:4px;}
.stat__value{font-size:clamp(32px,5vw,64px);font-weight:900;line-height:1;color:var(--c-orange);font-variant-numeric:tabular-nums;}
.stat__label{font-size:13px;letter-spacing:.08em;color:var(--c-ink-2);}

.media-frame{
  position:relative;
  overflow:hidden;
  background:linear-gradient(135deg,var(--c-mint),var(--c-green-mid));
  border:2px solid var(--c-ink);
  box-shadow:8px 8px 0 var(--c-mint);
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.85) contrast(1.03);}
.media-frame--wide{aspect-ratio:16/9;}
.media-frame--band{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:4/5;}
.media-frame__caption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:10px 14px;
  font-size:13px;
  letter-spacing:.04em;
  color:#EAF4F1;
  background:rgba(18,32,30,.74);
}

/* ---------- 7. 头部 ---------- */
.site-header{position:sticky;top:0;z-index:80;background:var(--c-mist);}
.skip-link{
  position:absolute;
  left:16px;
  top:8px;
  z-index:120;
  padding:10px 16px;
  font-size:14px;
  font-weight:700;
  color:#fff;
  background:var(--c-ink);
  text-decoration:none;
  transform:translateY(-220%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0);}
.header-top{
  max-height:64px;
  overflow:hidden;
  background:var(--c-green);
  transition:max-height .28s ease,opacity .22s ease;
}
.site-header.is-condensed .header-top{max-height:0;opacity:0;}
.header-top__inner{
  display:flex;
  flex-wrap:wrap;
  gap:4px 20px;
  align-items:center;
  justify-content:space-between;
  padding-top:9px;
  padding-bottom:9px;
  font-size:13px;
  letter-spacing:.04em;
}
.header-top__note{display:inline-flex;align-items:center;gap:8px;font-weight:700;color:#fff;}
.header-top__dot{flex:none;width:8px;height:8px;background:var(--c-orange);border-radius:50%;box-shadow:0 0 0 3px rgba(228,118,43,.28);}
.header-top__meta{color:#BEDAD3;}
.header-main{background:var(--c-white);border-bottom:3px solid var(--c-ink);}
.header-main__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding-top:10px;
  padding-bottom:10px;
}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--c-ink);}
.brand__mark{
  display:grid;
  place-items:center;
  flex:none;
  width:38px;
  height:38px;
  font-size:20px;
  font-weight:900;
  color:#fff;
  background:var(--c-green);
  border:2px solid var(--c-ink);
  box-shadow:3px 3px 0 var(--c-orange);
}
.brand__text{display:grid;line-height:1.15;}
.brand__name{font-size:18px;font-weight:900;letter-spacing:.02em;}
.brand__sub{font-size:12px;letter-spacing:.08em;color:var(--c-ink-2);}
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  font-size:14px;
  font-weight:700;
  background:var(--c-white);
  border:2px solid var(--c-ink);
  box-shadow:3px 3px 0 var(--c-ink);
  cursor:pointer;
  transition:background-color .16s ease;
}
.nav-toggle:hover{background:var(--c-orange-soft);}
.nav-toggle__bars{position:relative;flex:none;width:18px;height:12px;}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;right:0;
  height:2px;
  background:var(--c-ink);
  transition:transform .2s ease,top .2s ease,bottom .2s ease;
}
.nav-toggle__bars::before{top:0;}
.nav-toggle__bars::after{bottom:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:5px;transform:rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{bottom:5px;transform:rotate(-45deg);}
.nav-toggle__text{font-size:13px;letter-spacing:.08em;}
.site-nav{
  display:none;
  flex:1 0 100%;
  order:5;
  padding-top:8px;
  border-top:2px dashed var(--c-stone);
}
.site-nav[data-open]{display:block;}
.site-nav__list{display:flex;flex-direction:column;gap:2px;}
.site-nav__item{margin:0;}
.site-nav__link{
  display:block;
  padding:10px 12px;
  font-size:15px;
  font-weight:700;
  color:var(--c-ink);
  text-decoration:none;
  border:2px solid transparent;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
}
.site-nav__link:hover{background:var(--c-mint);border-color:var(--c-green-mid);}
.site-nav__link[aria-current="page"]{background:var(--c-green);color:#fff;border-color:var(--c-ink);}
.header-actions{display:none;flex:1 0 100%;order:6;gap:10px;padding-top:10px;}
.site-nav[data-open] ~ .header-actions{display:flex;flex-wrap:wrap;}
@media (max-width:1023px){
  .header-actions .btn{flex:1 1 auto;}
}
@media (min-width:1024px){
  .header-main__inner{flex-wrap:nowrap;gap:20px;padding-top:12px;padding-bottom:12px;}
  .nav-toggle{display:none;}
  .site-nav,
  .site-nav[data-open]{display:block;flex:1 1 auto;order:0;padding-top:0;border-top:0;}
  .site-nav__list{flex-direction:row;flex-wrap:wrap;gap:2px;justify-content:center;}
  .site-nav__link{padding:8px 12px;font-size:14.5px;}
  .header-actions{display:flex;flex:0 0 auto;order:0;align-items:center;gap:10px;padding-top:0;}
}
.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:4px;
  background:var(--timeline);
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  pointer-events:none;
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  margin-top:56px;
  color:#D9E7E3;
  background:var(--c-ink);
  border-top:4px solid var(--c-green-mid);
}
.site-footer .container{padding-top:44px;padding-bottom:32px;}
.footer-top{display:grid;gap:28px;}
.footer-brand__name{font-size:22px;font-weight:900;letter-spacing:.02em;color:#fff;}
.footer-brand__lede{margin-top:10px;max-width:34em;font-size:14px;line-height:1.85;color:#A9C6C0;}
.footer-nav{display:block;}
.footer-grid{display:grid;gap:22px;grid-template-columns:1fr;}
@media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (min-width:1024px){
  .footer-top{grid-template-columns:minmax(0,1fr) minmax(0,2.4fr);gap:44px;align-items:start;}
  .footer-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;}
}
.footer-col__title{
  padding-bottom:8px;
  font-size:14px;
  font-weight:900;
  letter-spacing:.08em;
  color:#fff;
  border-bottom:2px solid var(--c-green-mid);
}
.footer-col__desc{margin-top:10px;font-size:13.5px;line-height:1.75;color:#9FBDB7;}
.footer-col__link{
  display:inline-flex;
  margin-top:12px;
  font-size:14px;
  font-weight:700;
  color:var(--c-orange);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:border-color .16s ease,color .16s ease;
}
.footer-col__link:hover{color:#fff;border-bottom-color:var(--c-orange);}
.footer-contact{
  display:grid;
  gap:8px;
  margin-top:34px;
  padding:18px;
  font-size:14px;
  background:var(--c-footer-panel);
  border:2px solid var(--c-green-mid);
}
.footer-contact__item{color:#C6DDD8;}
.footer-contact__item .num{color:#fff;}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:12px 24px;
  align-items:center;
  justify-content:space-between;
  margin-top:26px;
  padding-top:18px;
  font-size:13px;
  color:#9FBDB7;
  border-top:1px solid rgba(143,169,163,.45);
}
.footer-legal__copy{margin:0;}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:6px 18px;}
.footer-legal__links a{
  color:#D9E7E3;
  text-decoration:none;
  padding-bottom:2px;
  border-bottom:2px solid var(--c-green-mid);
  transition:color .16s ease,border-color .16s ease;
}
.footer-legal__links a:hover{color:#fff;border-bottom-color:var(--c-orange);}
.footer-update{margin-top:14px;font-size:13px;letter-spacing:.04em;color:var(--c-stone);}

/* ---------- 9. 显现动效 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s ease,transform .5s cubic-bezier(.2,.7,.3,1);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 10. 动效与打印 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{transition-duration:.001ms !important;animation-duration:.001ms !important;}
  .has-js [data-reveal]{opacity:1;transform:none;transition:none;}
  .skip-link{transition:none;}
}
@media print{
  .site-header,.site-footer,.scroll-progress{display:none;}
}