*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,svg,video{max-width:100%}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0}
button{font:inherit}

:root{
  --ink-950:#081726;
  --ink-900:#0A2036;
  --ink-800:#0B3C5D;
  --ink-600:#155E86;
  --cement:#E8E6E1;
  --cement-deep:#D7D3CB;
  --red:#D52B1E;
  --red-dark:#A81F15;
  --gold:#F2B705;
  --ice:#A9C2D6;
  --white:#F7F9FB;
  --graphite:#12181D;
  --line:#2A3B49;
  --header-h:76px;
  --wrap:1240px;
  --radius-lg:28px;
  --radius-md:20px;
  --radius-sm:14px;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","Source Han Mono","SFMono-Regular",Menlo,Consolas,monospace;
  --shadow-card:0 18px 44px rgba(3,12,22,.45);
}

html{background:var(--ink-950)}
body{
  background:var(--ink-950);
  color:var(--white);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--red);color:#fff}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:6px}
#main-content:focus{outline:none}

/* ---------- 文本工具 ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:500;letter-spacing:0}
.serif{font-family:var(--font-serif);font-weight:700;letter-spacing:.02em}
.archive-mark{font-family:"Songti SC","SimSun",var(--font-serif);font-size:13px;letter-spacing:.08em;color:var(--ink-600)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.26em;text-transform:uppercase;color:var(--gold)}
.eyebrow::before{content:"";width:28px;height:2px;border-radius:2px;background:var(--red)}
.lead{font-size:19px;line-height:1.8;color:var(--ice);max-width:62ch}
.section--cement .lead{color:#42505C}

/* ---------- 布局 ---------- */
.container{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section--ink{background:var(--ink-800)}
.section--cement{background:var(--cement);color:var(--graphite)}
.section__head{max-width:760px;margin-bottom:36px}
.section__title{font-family:var(--font-serif);font-weight:700;font-size:clamp(28px,3.6vw,40px);line-height:1.28;letter-spacing:.02em;margin:14px 0 12px}
.section__lead{font-size:17px;line-height:1.78;color:var(--ice);max-width:62ch}
.section--cement .section__title{color:var(--graphite)}
.section--cement .section__lead{color:#42505C}
.section--cement .eyebrow{color:var(--red)}
.section--cement .eyebrow::before{background:var(--gold)}
.divider{height:1px;border:0;background:var(--line);margin:32px 0}
.section--cement .divider{background:var(--cement-deep)}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1fr) minmax(0,1.95fr);gap:40px}
.list-plain{list-style:none;margin:0;padding:0}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;left:16px;top:-80px;z-index:200;
  padding:12px 22px;border-radius:0 0 16px 16px;
  background:var(--gold);color:var(--graphite);
  font-size:15px;font-weight:700;text-decoration:none;
  transition:top 140ms ease;
}
.skip-link:focus{top:0}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  background:transparent;
  transition:background 120ms ease,box-shadow 120ms ease;
}
.site-header::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:linear-gradient(180deg,rgba(8,23,38,.92),rgba(8,23,38,0));
  opacity:1;transition:opacity 120ms ease;
}
.site-header[data-scrolled="true"]{
  background:var(--ink-800);
  box-shadow:0 14px 34px rgba(3,12,22,.5);
}
.site-header[data-scrolled="true"]::before{opacity:0}
.site-header__bar{position:relative}
.site-header__inner{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:var(--header-h);
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--white);flex:none}
.brand__mark{display:block;width:40px;height:40px;flex:none}
.brand__mark svg{display:block;width:100%;height:100%}
.brand__text{display:block;min-width:0}
.brand__name{display:block;font-family:var(--font-serif);font-weight:700;font-size:19px;line-height:1.2;letter-spacing:.08em}
.brand__sub{display:block;font-size:11px;line-height:1.4;letter-spacing:.2em;color:var(--ice)}

.nav{display:flex;align-items:center;gap:8px}
.nav__list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav__item{list-style:none}
.nav__link{
  display:block;padding:9px 15px;border-radius:999px;
  font-size:15px;font-weight:500;color:var(--ice);text-decoration:none;
  transition:color 140ms ease,background 140ms ease;
}
.nav__link:hover{color:var(--white);background:rgba(169,194,214,.14)}
.nav__link[aria-current="page"]{background:var(--red);color:#fff}
.nav__link[aria-current="page"]:hover{background:var(--red-dark)}
.header-cta{margin-left:12px;white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:10px 18px;border-radius:999px;
  border:1px solid var(--line);background:rgba(11,60,93,.72);
  color:var(--white);font-size:14px;font-weight:600;cursor:pointer;
  -webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:var(--gold);transition:transform 160ms ease,opacity 160ms ease}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.scroll-progress{
  position:absolute;left:0;bottom:0;height:2px;width:100%;
  background:var(--red);transform:scaleX(0);transform-origin:left center;
  transition:transform 120ms linear;pointer-events:none;
}
.site-header[data-scrolled="false"] .scroll-progress{opacity:0}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink-950);
  border-top:1px solid var(--line);
  padding:56px 0 32px;
  color:var(--ice);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:100%;height:3px;
  background:linear-gradient(90deg,var(--red) 0 22%,var(--gold) 22% 30%,var(--ink-600) 30% 100%);
  opacity:.85;
}
.footer__grid{display:grid;grid-template-columns:1.35fr 1fr 1.15fr 1.35fr;gap:32px}
.footer__col{min-width:0}
.footer__col--brand{max-width:34ch}
.footer__brand{font-family:var(--font-serif);font-weight:700;font-size:22px;letter-spacing:.08em;color:var(--white);margin-bottom:12px}
.footer__lead{font-size:15px;line-height:1.8;color:var(--ice);margin-bottom:16px}
.footer__tag{
  display:inline-block;padding:5px 12px;border-radius:999px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:var(--gold);border:1px solid rgba(242,183,5,.4);background:rgba(242,183,5,.1);
}
.footer__title{
  font-family:var(--font-serif);font-weight:700;font-size:15px;letter-spacing:.16em;
  color:var(--white);margin:0 0 16px;padding-bottom:10px;
  border-bottom:1px solid var(--line);
}
.footer__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer__link{
  color:var(--ice);text-decoration:none;font-size:15px;
  border-bottom:1px solid transparent;transition:color 140ms ease,border-color 140ms ease;
}
.footer__link:hover{color:var(--white);border-bottom-color:var(--gold)}
.footer__stat{
  display:flex;align-items:baseline;gap:12px;
  padding:12px 16px;margin-bottom:10px;
  border:1px solid var(--line);border-radius:var(--radius-sm);
  background:rgba(21,94,134,.2);
}
.footer__stat-value{font-size:22px;color:var(--gold);line-height:1.1;flex:none}
.footer__stat-label{font-size:13px;color:var(--ice);line-height:1.5}
.footer__contact{font-size:14px;line-height:1.9;color:var(--ice);word-break:break-all}
.footer__contact .mono{color:var(--white);font-size:13.5px}
.footer__note{font-size:13px;line-height:1.8;color:var(--ink-600);color:#7C93A6;margin-top:12px}
.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;
  margin-top:48px;padding-top:22px;border-top:1px solid var(--line);
}
.footer__legal{display:flex;align-items:center;flex-wrap:wrap;gap:10px;font-size:13px;color:var(--ice)}
.footer__region{display:inline-flex;align-items:center;gap:8px}
.footer__leaf{display:block;width:14px;height:14px;color:var(--ink-600);flex:none}
.footer__icp{color:var(--ice);text-decoration:none;border-bottom:1px solid transparent}
.footer__icp:hover{color:var(--white);border-bottom-color:var(--ink-600)}
.footer__sep{color:var(--ink-600)}
.footer__legal-list{display:flex;flex-wrap:wrap;gap:18px;list-style:none;margin:0;padding:0}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;border-radius:999px;border:1px solid transparent;
  font-family:var(--font-sans);font-size:15px;font-weight:600;letter-spacing:.04em;
  text-decoration:none;cursor:pointer;
  transition:background 160ms ease,color 160ms ease,border-color 160ms ease,transform 140ms ease;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--red);color:#fff}
.btn--primary:hover{background:var(--red-dark)}
.btn--ghost{background:transparent;color:var(--white);border-color:var(--ink-600)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--gold{background:var(--gold);color:var(--graphite)}
.btn--gold:hover{background:#FFC82E}
.btn--sm{padding:9px 18px;font-size:13.5px}

/* ---------- 面包屑 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:9px;list-style:none;margin:0;padding:0;font-size:13px;color:var(--ice)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:9px}
.breadcrumb__item a{color:var(--ice);text-decoration:none}
.breadcrumb__item a:hover{color:var(--gold)}
.breadcrumb__sep{color:var(--ink-600)}
.breadcrumb__item[aria-current="page"]{color:var(--white)}

/* ---------- 正文 ---------- */
.prose{max-width:72ch;font-size:17px;line-height:1.85;color:var(--ice)}
.prose > * + *{margin-top:18px}
.prose h2{font-family:var(--font-serif);font-weight:700;font-size:24px;line-height:1.4;color:var(--white);margin-top:36px}
.prose h3{font-size:19px;font-weight:600;color:var(--white);margin-top:28px}
.prose strong{color:var(--white)}
.prose a{color:var(--gold);text-decoration:none;border-bottom:1px solid rgba(242,183,5,.4)}
.prose ul,.prose ol{padding-left:1.4em}
.prose li + li{margin-top:8px}
.section--cement .prose{color:#3A4750}
.section--cement .prose h2,.section--cement .prose h3,.section--cement .prose strong{color:var(--graphite)}

/* ---------- 卡片与标签 ---------- */
.card{
  position:relative;
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:26px;
  box-shadow:var(--shadow-card);
}
.section--cement .card{background:#fff;border-color:var(--cement-deep);color:var(--graphite);box-shadow:0 14px 34px rgba(30,42,52,.12)}
.card__head{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin-bottom:14px}
.card__title{font-family:var(--font-serif);font-weight:700;font-size:21px;line-height:1.35;letter-spacing:.02em;color:var(--white)}
.section--cement .card__title{color:var(--graphite)}
.card__body{font-size:16px;line-height:1.8;color:var(--ice)}
.section--cement .card__body{color:#3A4750}
.card__meta{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;color:var(--ink-600);color:#6E8698;margin-top:16px}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:999px;
  font-size:12px;font-weight:600;letter-spacing:.08em;
  background:rgba(169,194,214,.14);color:var(--ice);border:1px solid var(--line);
}
.tag--gold{background:rgba(242,183,5,.14);color:var(--gold);border-color:rgba(242,183,5,.42)}
.tag--red{background:rgba(213,43,30,.18);color:#FF8A7E;border-color:rgba(213,43,30,.5)}
.section--cement .tag{background:rgba(18,24,29,.05);color:#3A4750;border-color:var(--cement-deep)}
.section--cement .tag--gold{background:rgba(242,183,5,.2);color:#7A5C00;border-color:rgba(242,183,5,.55)}
.section--cement .tag--red{background:rgba(213,43,30,.1);color:var(--red-dark);border-color:rgba(213,43,30,.35)}
.pill{
  display:inline-flex;align-items:center;
  padding:7px 15px;border-radius:999px;
  font-size:13px;font-weight:600;letter-spacing:.06em;
  background:var(--ink-900);color:var(--ice);border:1px solid var(--line);
}

/* ---------- 数据 ---------- */
.stat{display:flex;flex-direction:column;gap:6px;padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius-md);background:rgba(21,94,134,.16)}
.stat__value{display:block;font-family:var(--font-mono);font-weight:500;font-size:clamp(28px,3.6vw,42px);line-height:1.1;color:var(--gold)}
.stat__label{font-size:13px;letter-spacing:.1em;color:var(--ice)}
.section--cement .stat{background:#fff;border-color:var(--cement-deep)}
.section--cement .stat__value{color:var(--red)}
.section--cement .stat__label{color:#4A5860}

/* ---------- 媒体占位 ---------- */
.media{display:block;margin:0}
.media__frame{
  position:relative;overflow:hidden;border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:linear-gradient(158deg,rgba(21,94,134,.6),rgba(8,23,38,.94));
}
.media__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(169,194,214,.16) 0 1px,transparent 1px 46px),
    repeating-linear-gradient(0deg,rgba(169,194,214,.1) 0 1px,transparent 1px 46px);
  opacity:.75;
}
.media__frame > img,.media__frame > svg{display:block;width:100%;height:100%;object-fit:cover}
.media--16x9 .media__frame{aspect-ratio:16/9}
.media--4x3 .media__frame{aspect-ratio:4/3}
.media--1x1 .media__frame{aspect-ratio:1/1}
.media--wide .media__frame{aspect-ratio:21/9}
.media__caption{margin-top:10px;font-size:13px;line-height:1.7;color:var(--ice);letter-spacing:.02em}
.section--cement .media__caption{color:#4A5860}

/* ---------- 筛选 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:9px}
.filter-bar__btn{
  padding:9px 17px;border-radius:999px;
  border:1px solid var(--line);background:transparent;
  color:var(--ice);font-size:14px;font-weight:600;letter-spacing:.04em;cursor:pointer;
  transition:color 160ms ease,background 160ms ease,border-color 160ms ease,opacity 180ms ease;
}
.filter-bar__btn:hover{color:var(--white);border-color:var(--ink-600)}
.filter-bar__btn.is-active{background:var(--red);border-color:var(--red);color:#fff}
.section--cement .filter-bar__btn{border-color:var(--cement-deep);color:#4A5860}
.section--cement .filter-bar__btn:hover{color:var(--graphite);border-color:var(--ink-600)}
.section--cement .filter-bar__btn.is-active{background:var(--red);border-color:var(--red);color:#fff}
.is-hidden{display:none !important}

/* ---------- 显现 ---------- */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 移动导航 ---------- */
@media (max-width:960px){
  body[data-nav-open="true"]{overflow:hidden}
  .nav-toggle{display:inline-flex}
  .brand__sub{display:none}
  .nav{
    position:fixed;left:16px;right:16px;top:calc(var(--header-h) + 10px);
    z-index:90;
    display:flex;flex-direction:column;align-items:stretch;gap:6px;
    max-height:calc(100dvh - var(--header-h) - 32px);overflow-y:auto;
    padding:16px;border-radius:var(--radius-lg);
    background:var(--ink-800);border:1px solid var(--line);
    box-shadow:0 26px 60px rgba(2,9,17,.6);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity 160ms ease,transform 160ms ease,visibility 160ms;
  }
  .nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav__list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav__link{padding:14px 16px;border-radius:var(--radius-sm);font-size:16px}
  .header-cta{margin:12px 0 0;width:100%}
}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  .footer__grid{grid-template-columns:1.2fr 1fr 1fr;gap:28px}
  .footer__col--brand{grid-column:1 / -1;max-width:none}
}
@media (max-width:900px){
  .section{padding:56px 0}
  .grid--split,.grid--3{grid-template-columns:1fr}
  .grid--2{grid-template-columns:1fr}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  :root{--header-h:64px}
  body{font-size:16px}
  .container{padding:0 16px}
  .section{padding:44px 0}
  .brand__mark{width:34px;height:34px}
  .brand__name{font-size:17px;letter-spacing:.06em}
  .nav-toggle{padding:9px 14px;font-size:13px}
  .card{padding:20px;border-radius:var(--radius-md)}
  .footer__grid{grid-template-columns:1fr;gap:26px}
  .footer__bottom{flex-direction:column;align-items:flex-start;gap:12px}
  .footer__legal-list{gap:14px}
  .stat{padding:15px 16px}
}

/* ---------- 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;transform:none}
  .nav{transition:none}
  .scroll-progress{transition:none}
  .btn:hover{transform:none}
}