/* =========================================================
   宇博官网 · 共享样式表 /assets/site.css
   骨架：墨黑 × 雾白高对比；活力橙为唯一强锚点；冷蓝只做层级
   ========================================================= */

/* 1. Reset ------------------------------------------------ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:140px}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,figcaption,blockquote,dl,dt,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
.nav-open{overflow:hidden}

/* 2. 变量 -------------------------------------------------- */
:root{
  --ink:#0B0F12;
  --white:#FFFFFF;
  --snow:#F4F7F9;
  --mist:#D9E2E8;
  --deep:#12303B;
  --blue:#2E6F8E;
  --ice:#7FC4D9;
  --orange:#FF5A1F;
  --amber:#FFB37A;
  --teal:#0E7C7B;

  --line:rgba(11,15,18,.12);
  --line-strong:rgba(11,15,18,.24);
  --line-light:rgba(255,255,255,.14);
  --text-muted:rgba(18,48,59,.7);
  --text-light:rgba(255,255,255,.74);

  --shell:1200px;
  --r-xs:12px;
  --r-sm:18px;
  --r-md:26px;
  --r-lg:34px;
  --pill:999px;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",Georgia,"Times New Roman",serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Condensed",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --dur:200ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --header-offset:118px;
}

/* 3. 基础排版 ---------------------------------------------- */
body{
  font-family:var(--font-body);
  font-size:16.5px;
  line-height:1.75;
  color:var(--deep);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;color:var(--ink)}
:focus-visible{outline:3px solid var(--ice);outline-offset:3px;border-radius:8px}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--amber)}

/* 4. 布局容器 ---------------------------------------------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:20px}
.shell--narrow{max-width:860px}
.section{padding-block:56px}
.section--tight{padding-block:36px}
.section--snow{background:var(--snow)}
.section--ink{background:var(--ink);color:var(--text-light)}
.section--deep{background:var(--deep);color:var(--text-light)}
.section--ink h2,.section--ink h3,.section--deep h2,.section--deep h3{color:#fff}
.rule{height:1px;border:0;background:var(--line);margin:0}

/* 5. 头部 -------------------------------------------------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--ink);
  color:var(--white);
  border-bottom:1px solid var(--line-light);
  transition:box-shadow var(--dur) var(--ease);
}
.site-header[data-scrolled="true"]{box-shadow:0 14px 34px rgba(11,15,18,.34)}
.site-header[data-scrolled="true"] .header-top__inner{min-height:44px;padding-block:6px}
.site-header[data-scrolled="true"] .header-bar__inner{min-height:56px}

.header-top{border-bottom:1px solid rgba(255,255,255,.08)}
.header-top__inner{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:54px;padding-block:9px;
  transition:min-height var(--dur) var(--ease),padding var(--dur) var(--ease);
}
.header-bar__inner{
  display:flex;align-items:center;gap:14px;
  min-height:64px;padding-block:9px;
  transition:min-height var(--dur) var(--ease);
}
.header-status{
  display:flex;align-items:center;gap:10px;margin:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:rgba(255,255,255,.62);white-space:nowrap;
}
.status-dot{
  width:8px;height:8px;border-radius:50%;background:var(--teal);
  box-shadow:0 0 0 4px rgba(14,124,123,.22);
  animation:pulse 2.6s var(--ease) infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 4px rgba(14,124,123,.22)}
  50%{box-shadow:0 0 0 8px rgba(14,124,123,.06)}
}
.header-util{display:flex;align-items:center;gap:8px}
.util-chip{
  padding:6px 14px;border-radius:var(--pill);
  border:1px solid rgba(255,255,255,.16);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:rgba(255,255,255,.7);white-space:nowrap;
}
.util-chip--tip{
  border-color:rgba(255,90,31,.5);
  background:rgba(255,90,31,.12);
  color:var(--amber);
}

/* 品牌署名 */
.brand{display:inline-flex;align-items:center;gap:12px;color:inherit}
.brand__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:40px;height:40px;border-radius:14px;
  background:linear-gradient(140deg,var(--orange),var(--amber));
  color:#fff;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;font-weight:600;
}
.brand__text{display:flex;flex-direction:column;gap:2px}
.brand__name{display:block;font-size:16px;font-weight:700;letter-spacing:.02em;color:#fff;line-height:1.2}
.brand__line{display:block;font-size:11px;letter-spacing:.18em;color:rgba(127,196,217,.92);line-height:1.3}
.brand--stack{margin-bottom:20px}

/* 栏目胶囊 */
.site-nav{flex:1 1 auto;min-width:0}
.site-nav__head{display:none}
.site-nav__coord{color:rgba(127,196,217,.7)}
.site-nav__list{
  display:flex;align-items:center;gap:6px;
  overflow-x:auto;overflow-y:hidden;
  scrollbar-width:none;-ms-overflow-style:none;
  scroll-snap-type:x proximity;
}
.site-nav__list::-webkit-scrollbar{display:none}
.site-nav__item{flex:0 0 auto;scroll-snap-align:start}
.nav-link{
  display:inline-flex;align-items:center;
  padding:11px 17px;border-radius:var(--pill);
  border:1px solid transparent;
  color:rgba(255,255,255,.78);
  font-size:14.5px;line-height:1;white-space:nowrap;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.nav-link:hover{
  background:rgba(255,255,255,.08);
  border-color:rgba(255,255,255,.2);
  color:#fff;
}
.nav-link[aria-current="page"]{
  background:var(--orange);border-color:var(--orange);color:#fff;
  box-shadow:0 8px 20px rgba(255,90,31,.32);
}

/* 菜单按钮（桌面隐藏） */
.nav-toggle{display:none;flex:0 0 auto}
.nav-toggle__bars{
  position:relative;width:18px;height:2px;border-radius:2px;background:currentColor;
  box-shadow:0 -6px 0 currentColor,0 6px 0 currentColor;
}
.scroll-progress{
  position:absolute;left:0;bottom:-1px;height:3px;width:0;
  background:linear-gradient(90deg,var(--ice),var(--orange));
  transition:width 120ms linear;
}

/* 6. 页脚 -------------------------------------------------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,#0B0F12 0%,#0d1519 100%);
  color:var(--text-light);
  padding-block:64px 26px;
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--orange),var(--ice) 46%,rgba(127,196,217,0));
}
.footer-grid{display:grid;grid-template-columns:1fr;gap:38px}
.footer-col{min-width:0}
.footer-col__title{
  position:relative;
  margin-bottom:18px;padding-left:16px;
  font-family:var(--font-mono);font-weight:500;
  font-size:11.5px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--ice);
}
.footer-col__title::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:8px;height:2px;background:var(--orange);
}
.footer-note{font-size:14.5px;line-height:1.7;color:var(--text-light);max-width:34ch}
.footer-record{
  margin-top:14px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:rgba(255,255,255,.5);
}
.footer-links{display:grid;gap:11px}
.footer-link{
  display:inline-block;
  font-size:14.5px;color:rgba(255,255,255,.72);
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:#fff;border-bottom-color:var(--orange)}
.footer-contact{display:grid;gap:16px}
.footer-contact__item{display:grid;gap:4px}
.footer-contact__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:rgba(127,196,217,.8);text-transform:uppercase;
}
.footer-contact__value{font-size:14.5px;line-height:1.6;color:rgba(255,255,255,.82);word-break:break-word}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:space-between;
  margin-top:52px;padding-top:20px;
  border-top:1px solid var(--line-light);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:rgba(255,255,255,.5);
}
.footer-bottom__text,.footer-bottom__meta{margin:0}

/* 7. 按钮与标签 -------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:0 24px;border-radius:var(--pill);
  border:1px solid transparent;
  font-size:15px;font-weight:600;line-height:1;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--orange);color:#fff;box-shadow:0 12px 26px rgba(255,90,31,.26)}
.btn--primary:hover{background:#e94c14;box-shadow:0 16px 32px rgba(255,90,31,.34)}
.btn--ink{background:var(--ink);color:#fff}
.btn--ink:hover{background:var(--deep)}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--ink)}
.btn--ghost:hover{border-color:var(--orange);color:var(--orange)}
.btn--outline-light{background:transparent;border-color:rgba(255,255,255,.36);color:#fff}
.btn--outline-light:hover{background:#fff;color:var(--ink);border-color:#fff}
.btn--small{min-height:44px;padding:0 18px;font-size:14px}

.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border-radius:var(--pill);
  border:1px solid var(--line);
  background:var(--white);color:var(--deep);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;
}
.chip--orange{border-color:rgba(255,90,31,.42);background:rgba(255,90,31,.08);color:#c53f0d}
.chip--ice{border-color:rgba(127,196,217,.5);background:rgba(127,196,217,.14);color:#1d5570}
.chip--dark{border-color:var(--line-light);background:rgba(255,255,255,.06);color:var(--text-light)}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}

/* 8. 标题组与正文 ------------------------------------------ */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--blue);
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--orange)}
.section--ink .eyebrow,.section--deep .eyebrow{color:var(--ice)}
.display-title{
  font-family:var(--font-display);
  font-size:clamp(2.6rem,7vw,5.2rem);
  line-height:.98;letter-spacing:-.03em;color:var(--ink);
}
.display-title--xl{font-size:clamp(3rem,9vw,7rem)}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(1.8rem,3.6vw,3rem);
  line-height:1.14;letter-spacing:-.02em;color:var(--ink);
}
.lede{max-width:56ch;font-size:clamp(1.05rem,1.5vw,1.25rem);line-height:1.7;color:var(--text-muted)}
.section--ink .lede,.section--deep .lede{color:var(--text-light)}
.prose{max-width:68ch;font-size:17px;line-height:1.8;color:var(--deep)}
.prose p + p{margin-top:1.1em}
.prose h2{margin:1.8em 0 .6em;font-size:clamp(1.5rem,2.6vw,2.1rem);line-height:1.25}
.prose h3{margin:1.4em 0 .5em;font-size:1.2rem;line-height:1.35}
.prose ul{margin:1em 0;padding-left:1.3em;list-style:disc}
.prose li{margin-bottom:.4em}
.prose a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--orange)}
.section-head{display:grid;gap:14px;max-width:760px;margin-bottom:36px}
.section-head__index{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.2em;color:var(--orange)}
.section-head__title{
  font-family:var(--font-display);font-size:clamp(1.8rem,3.6vw,3rem);
  line-height:1.12;letter-spacing:-.02em;color:var(--ink);
}
.section-head__desc{font-size:16.5px;color:var(--text-muted);max-width:60ch}
.section--ink .section-head__title,.section--deep .section-head__title{color:#fff}
.section--ink .section-head__desc,.section--deep .section-head__desc{color:var(--text-light)}
.coord-label{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--blue);
}
.link-more{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:600;font-size:15px;color:var(--ink);
  border-bottom:2px solid transparent;padding-bottom:2px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.link-more::after{content:"\2192";font-family:var(--font-mono)}
.link-more:hover,.link-more:focus-visible{color:var(--orange);border-bottom-color:var(--orange)}

/* 9. 卡片与编号区块 ---------------------------------------- */
.card-grid{display:grid;gap:20px;grid-template-columns:repeat(auto-fit,minmax(258px,1fr))}
.card-grid--2{grid-template-columns:1fr}
.card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:26px;border:1px solid var(--line);border-radius:var(--r-md);
  background:var(--white);
  transition:transform var(--dur) var(--ease),border-color var(--dur) var(--ease),
             box-shadow var(--dur) var(--ease);
}
.card:hover,.card:focus-within{
  transform:translateY(-2px);
  border-color:var(--orange);
  box-shadow:0 18px 40px rgba(11,15,18,.09);
}
.card__coord{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--blue);
}
.card__title{font-family:var(--font-display);font-size:1.35rem;line-height:1.3;color:var(--ink)}
.card__text{font-size:15.5px;color:var(--text-muted)}
.card__meta{margin-top:auto;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--blue)}
.card--snow{background:var(--snow)}
.card--ink{background:var(--ink);border-color:rgba(255,255,255,.1);color:var(--text-light)}
.card--ink .card__title{color:#fff}
.card--ink .card__text{color:var(--text-light)}

.num-block{display:grid;gap:16px;padding-block:32px;border-top:1px solid var(--line)}
.num-block__index{
  font-family:var(--font-mono);font-size:clamp(2.4rem,5vw,3.4rem);
  line-height:1;letter-spacing:-.02em;color:var(--orange);
}
.num-block__title{font-family:var(--font-display);font-size:clamp(1.5rem,2.6vw,2.2rem);line-height:1.2;color:var(--ink)}
.num-block__text{margin-top:12px;max-width:68ch;color:var(--text-muted)}

.stat-row{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.stat{padding:22px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--snow)}
.stat__value{font-family:var(--font-display);font-size:clamp(1.8rem,3vw,2.6rem);line-height:1;color:var(--ink)}
.stat__label{margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--blue)}

/* 10. 图片容器（页面阶段放置图片或留作占位） --------------- */
.media-frame{
  position:relative;display:block;width:100%;
  aspect-ratio:16/10;
  border:1px solid var(--line);border-radius:var(--r-md);
  overflow:hidden;isolation:isolate;
  background:
    radial-gradient(120% 90% at 16% 10%,rgba(127,196,217,.5),transparent 62%),
    radial-gradient(90% 80% at 88% 84%,rgba(255,90,31,.26),transparent 64%),
    linear-gradient(160deg,#0B0F12 0%,#12303B 58%,#2E6F8E 128%);
}
.media-frame > img{width:100%;height:100%;object-fit:cover}
.media-frame--square{aspect-ratio:1/1}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--portrait{aspect-ratio:4/5}
.media-frame__tag{
  position:absolute;top:14px;left:14px;z-index:2;
  padding:6px 12px;border-radius:var(--pill);
  background:rgba(11,15,18,.6);border:1px solid var(--line-light);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:#fff;
}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:20px;font-size:13.5px;line-height:1.6;color:rgba(255,255,255,.9);
  background:linear-gradient(180deg,rgba(11,15,18,0) 0%,rgba(11,15,18,.86) 100%);
}

/* 11. 面包屑与工具类 --------------------------------------- */
.breadcrumbs{padding-block:18px}
.breadcrumbs__list{
  display:flex;flex-wrap:wrap;align-items:center;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--blue);
}
.breadcrumbs__item{display:flex;align-items:center;gap:8px}
.breadcrumbs__item:not(:first-child)::before{content:"/";color:var(--mist)}
.breadcrumbs__link{color:var(--blue);transition:color var(--dur) var(--ease)}
.breadcrumbs__link:hover{color:var(--orange)}
.sr-only{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.skip-link{
  position:absolute;left:16px;top:-80px;z-index:200;
  padding:12px 22px;border-radius:var(--pill);
  background:var(--orange);color:#fff;font-weight:600;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}
.reveal{opacity:0;transform:translateY(14px);transition:opacity 460ms var(--ease),transform 460ms var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* 12. 响应式 ----------------------------------------------- */
@media (min-width:768px){
  .shell{padding-inline:32px}
  .section{padding-block:88px}
  .section--tight{padding-block:48px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (min-width:860px){
  .num-block{grid-template-columns:118px 1fr;gap:32px;padding-block:48px}
  .card-grid--2{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1040px){
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1.25fr;gap:48px}
}
@media (max-width:1023px){
  .header-util{display:none}
}
@media (max-width:900px){
  :root{--header-offset:112px}
  .header-bar__inner{justify-content:space-between}
  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-offset);bottom:0;
    display:flex;flex-direction:column;
    background:var(--ink);
    border-top:1px solid var(--line-light);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    overflow-y:auto;z-index:55;
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) var(--ease);
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .site-nav__head{
    display:flex;align-items:center;justify-content:space-between;gap:12px;
    padding:24px 20px 4px;
    font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;
    text-transform:uppercase;color:var(--ice);
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:10px;padding:10px 20px 40px;overflow:visible}
  .site-nav__item{width:100%}
  .nav-link{
    display:flex;align-items:center;justify-content:space-between;
    width:100%;min-height:58px;padding:0 20px;
    border:1px solid var(--line-light);border-radius:var(--r-sm);
    background:rgba(255,255,255,.04);
    color:rgba(255,255,255,.88);font-size:17px;
  }
  .nav-link::after{
    content:attr(data-index);
    font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
    color:rgba(127,196,217,.8);
  }
  .nav-link:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.3);color:#fff}
  .nav-link[aria-current="page"]{
    background:var(--orange);border-color:var(--orange);color:#fff;
    box-shadow:0 14px 28px rgba(255,90,31,.3);
  }
  .nav-link[aria-current="page"]::after{color:rgba(255,255,255,.88)}
  .nav-toggle{
    display:inline-flex;align-items:center;gap:10px;
    min-height:48px;padding:0 18px;border-radius:var(--pill);
    border:1px solid var(--line-light);background:rgba(255,255,255,.08);
    color:#fff;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
    transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
  }
  .nav-toggle:hover{background:rgba(255,255,255,.16)}
  .nav-toggle__label{line-height:1}
  .site-nav[data-open="true"] + .nav-toggle{
    background:var(--orange);border-color:var(--orange);color:#fff;
  }
}
@media (max-width:760px){
  .header-status{display:none}
  .header-top__inner{min-height:48px}
  .brand__mark{width:36px;height:36px;border-radius:12px;font-size:11.5px}
  .brand__name{font-size:15px}
  .brand__line{letter-spacing:.12em}
}

/* 13. 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;
  }
  .reveal{opacity:1;transform:none}
  .btn:hover,.card:hover,.card:focus-within{transform:none}
}