/* ===== 基础重置 ===== */
*,
*::before,
*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
[hidden]{display:none!important}

/* ===== 设计变量 ===== */
:root{
  --ink:#0B1B2B;
  --navy:#132E47;
  --mist:#AFC2C8;
  --paper:#F6F1E6;
  --gold:#C99A4A;
  --gold-light:#E7CB8F;
  --cinnabar:#B4402E;
  --black:#11181F;
  --glass:#DCE5E7;
  --jade:#6F8A8C;
  --line:rgba(201,154,74,.34);
  --line-soft:rgba(11,27,43,.14);
  --on-dark:rgba(246,241,230,.86);
  --on-dark-soft:rgba(220,229,231,.72);
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shell:1180px;
  --pad:clamp(18px,4vw,44px);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ===== 中文排版与画布 ===== */
html{scroll-padding-top:104px}
[id]{scroll-margin-top:104px}
body{
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  color:var(--black);
  background:
    radial-gradient(120% 78% at 52% -8%,rgba(175,194,200,.5),rgba(175,194,200,0) 62%),
    linear-gradient(180deg,#E8EDEE 0%,#F1F1EA 42%,var(--paper) 100%);
  background-attachment:fixed;
  min-height:100vh;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.3;letter-spacing:.02em;color:var(--ink)}
h1{font-size:clamp(34px,5vw,60px)}
h2{font-size:clamp(24px,3.2vw,36px)}
h3{font-size:clamp(19px,2.1vw,24px)}
p{max-width:38em}
strong{font-weight:600;color:var(--ink)}
::selection{background:rgba(201,154,74,.35);color:var(--ink)}

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

/* ===== 无障碍工具类 ===== */
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;border:0;
}
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:300;
  padding:11px 18px;
  background:var(--gold);
  color:#20180A;
  font-size:14px;font-weight:600;
  letter-spacing:.06em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:none}

/* ===== 页头门廊 ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--ink);
  color:var(--paper);
  border-bottom:1px solid var(--line);
  box-shadow:0 18px 34px -26px rgba(11,27,43,.95);
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.site-header[data-scrolled="true"]{
  border-bottom-color:rgba(231,203,143,.7);
  box-shadow:0 22px 44px -26px rgba(0,0,0,.85);
}
.scroll-progress{
  position:absolute;
  left:0;right:0;top:0;
  height:2px;
  background:rgba(220,229,231,.14);
  z-index:3;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--gold),var(--gold-light));
}

.header-utility{
  background:linear-gradient(90deg,rgba(19,46,71,.95),rgba(11,27,43,.95));
  border-bottom:1px solid rgba(220,229,231,.12);
}
.header-utility__inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding:7px var(--pad);
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px 20px;
  font-size:12.5px;
  color:var(--mist);
}
.header-utility__line{color:var(--paper);letter-spacing:.08em}
.header-utility__tagline{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--gold-light);
}
.header-utility__note{
  margin-left:auto;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--mist);
}

.header-main{
  position:relative;
  background:linear-gradient(180deg,#0E2135 0%,#0B1B2B 100%);
}
.header-main__inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding:13px var(--pad) 15px;
  display:flex;
  align-items:center;
  gap:clamp(14px,3vw,38px);
}
.header-frame{
  position:absolute;
  left:0;right:0;bottom:0;
  height:1px;
  background:linear-gradient(90deg,rgba(201,154,74,0),rgba(201,154,74,.8) 18%,rgba(231,203,143,.95) 50%,rgba(201,154,74,.8) 82%,rgba(201,154,74,0));
  opacity:.62;
  transition:opacity .25s var(--ease);
  pointer-events:none;
}
.site-header[data-scrolled="true"] .header-frame{opacity:1}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  padding:4px 2px;
}
.brand__mark{
  width:42px;height:42px;
  display:grid;place-items:center;
  flex:0 0 auto;
  border:1px solid rgba(201,154,74,.62);
  border-radius:50%;
  font-family:var(--serif);
  font-size:19px;
  color:var(--gold-light);
  background:radial-gradient(circle at 32% 26%,rgba(201,154,74,.3),rgba(201,154,74,0) 72%);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.brand:hover .brand__mark{
  border-color:var(--gold-light);
  box-shadow:0 0 0 4px rgba(201,154,74,.12);
}
.brand__text{display:flex;flex-direction:column;gap:1px;line-height:1.2}
.brand__name{
  font-family:var(--serif);
  font-size:19px;
  letter-spacing:.14em;
  color:var(--paper);
}
.brand__sub{
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--mist);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;
  gap:9px;
  padding:9px 14px;
  border:1px solid rgba(201,154,74,.5);
  border-radius:2px;
  color:var(--gold-light);
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(201,154,74,.14);border-color:var(--gold-light)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;height:10px;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;right:0;
  height:1px;
  background:currentColor;
  transition:transform .22s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4.5px) rotate(-45deg)}

/* 主导航 */
.site-nav{margin-left:auto}
.site-nav__list{display:flex;align-items:stretch;flex-wrap:nowrap}
.site-nav__item{border-left:1px solid rgba(220,229,231,.13)}
.site-nav__item:last-child{border-right:1px solid rgba(220,229,231,.13)}
.site-nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:7px;
  padding:12px 14px;
  font-size:14.5px;
  color:var(--on-dark);
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.site-nav__num{
  font-family:var(--mono);
  font-size:10px;
  letter-spacing:.08em;
  color:rgba(175,194,200,.85);
  transition:color .2s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:14px;right:14px;bottom:7px;
  height:1px;
  background:var(--gold-light);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .26s var(--ease);
}
.site-nav__link:hover{color:#fff;background:rgba(220,229,231,.06)}
.site-nav__link:hover .site-nav__num{color:var(--gold-light)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{
  color:var(--gold-light);
  background:rgba(201,154,74,.12);
}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--gold-light)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__meta{display:none}

/* ===== 页脚 ===== */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,#0B1B2B 0%,#132E47 58%,#0B1B2B 100%);
  color:var(--on-dark-soft);
  border-top:1px solid rgba(201,154,74,.55);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(231,203,143,.85),transparent);
}
.footer-inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(34px,6vw,62px) var(--pad) clamp(24px,4vw,40px);
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);
  gap:clamp(26px,5vw,60px);
}
.footer-crest__brand{
  font-family:var(--serif);
  font-size:clamp(22px,3vw,30px);
  letter-spacing:.16em;
  color:var(--paper);
}
.footer-crest__summary{
  margin-top:12px;
  font-size:15px;
  line-height:1.85;
  color:var(--on-dark-soft);
  max-width:24em;
}
.footer-crest__actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:22px;
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,3vw,30px);
}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--gold);
  padding-bottom:9px;
  border-bottom:1px solid rgba(220,229,231,.18);
}
.footer-col__list{
  margin-top:13px;
  display:grid;
  gap:8px;
}
.footer-col__link{
  display:inline-block;
  font-size:14.5px;
  color:rgba(246,241,230,.8);
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.footer-col__link:hover{color:var(--gold-light);padding-left:5px}

.footer-meta{
  border-top:1px solid rgba(220,229,231,.14);
  border-bottom:1px solid rgba(220,229,231,.14);
  background:rgba(11,27,43,.5);
}
.footer-meta__inner{
  max-width:var(--shell);
  margin-inline:auto;
  padding:20px var(--pad);
  display:flex;
  flex-wrap:wrap;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px 40px;
}
.footer-contact{display:grid;gap:9px}
.footer-contact__item{
  display:flex;
  flex-wrap:wrap;
  gap:4px 12px;
  align-items:baseline;
  font-size:14px;
}
.footer-contact__label{
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.18em;
  color:var(--mist);
  min-width:5.2em;
}
.footer-contact__value{
  font-family:var(--mono);
  letter-spacing:.04em;
  color:rgba(246,241,230,.94);
}
.footer-note{
  max-width:32em;
  font-size:13px;
  line-height:1.85;
  color:rgba(220,229,231,.7);
}
.footer-legal{
  max-width:var(--shell);
  margin-inline:auto;
  padding:18px var(--pad) 26px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 24px;
  font-size:12.5px;
  color:rgba(175,194,200,.85);
}
.footer-legal__copy{
  font-family:var(--mono);
  letter-spacing:.06em;
}
.footer-legal__icp{
  font-family:var(--mono);
  letter-spacing:.05em;
}
.footer-legal__links{
  display:flex;
  flex-wrap:wrap;
  gap:18px;
  margin-left:auto;
}
.footer-legal__link{
  color:rgba(246,241,230,.78);
  transition:color .2s var(--ease);
}
.footer-legal__link:hover{color:var(--gold-light)}

/* ===== 通用按钮 ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:0 20px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--sans);
  font-size:14.5px;
  letter-spacing:.06em;
  cursor:pointer;
  transition:transform .18s var(--ease),background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--gold{
  background:linear-gradient(180deg,var(--gold-light),var(--gold));
  color:#20180A;
  font-weight:600;
  box-shadow:0 12px 26px -18px rgba(201,154,74,.95);
}
.btn--gold:hover{background:linear-gradient(180deg,#F2DEAC,var(--gold-light));transform:translateY(-1px)}
.btn--ghost{
  background:rgba(220,229,231,.06);
  border-color:rgba(201,154,74,.55);
  color:var(--gold-light);
}
.btn--ghost:hover{background:rgba(201,154,74,.16);color:#fff;border-color:var(--gold-light)}
.btn--quiet{
  background:transparent;
  border-color:var(--line-soft);
  color:var(--ink);
}
.btn--quiet:hover{border-color:var(--gold);color:#6B4A12;background:rgba(231,203,143,.22)}

/* ===== 页面容器与节奏 ===== */
.container{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.container--narrow{max-width:780px}
.section{padding-block:clamp(40px,6vw,78px)}

/* ===== 面包屑 ===== */
.breadcrumb{padding-block:16px 4px}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--jade);
}
.breadcrumb__item{display:flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{
  content:"/";
  color:rgba(11,27,43,.28);
}
.breadcrumb__link{
  color:rgba(17,24,31,.68);
  transition:color .2s var(--ease);
}
.breadcrumb__link:hover{color:#6B4A12;text-decoration:underline;text-underline-offset:3px}
.breadcrumb__current{color:var(--ink);font-weight:600}

/* ===== 网格 ===== */
.grid{display:grid;gap:clamp(18px,3vw,32px)}
.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,.92fr) minmax(0,1.08fr)}

/* ===== 章节抬头 ===== */
.section-head{display:grid;gap:10px;max-width:46rem}
.section-head__eyebrow{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cinnabar);
}
.section-head__title{
  font-family:var(--serif);
  font-size:clamp(24px,3.2vw,34px);
  line-height:1.34;
  color:var(--ink);
}
.section-head__lede{
  font-size:16px;
  line-height:1.85;
  color:rgba(17,24,31,.78);
}

/* ===== 标签 ===== */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid rgba(11,27,43,.18);
  border-radius:999px;
  background:rgba(220,229,231,.55);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.12em;
  color:rgba(17,24,31,.74);
}
.tag--gold{
  border-color:rgba(201,154,74,.55);
  background:rgba(231,203,143,.35);
  color:#6B4A12;
}
.tag--alert{
  border-color:rgba(180,64,46,.42);
  background:rgba(180,64,46,.09);
  color:var(--cinnabar);
}

/* ===== 面板 ===== */
.panel{
  padding:clamp(18px,3vw,28px);
  background:var(--paper);
  border:1px solid rgba(11,27,43,.1);
}
.panel--glass{
  background:rgba(220,229,231,.4);
  border-color:rgba(255,255,255,.55);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}

/* ===== 图片容器（页面阶段放置图片） ===== */
.media{
  position:relative;
  overflow:hidden;
  border-radius:2px;
  border:1px solid rgba(201,154,74,.3);
  background:
    radial-gradient(120% 90% at 22% 6%,rgba(201,154,74,.26),rgba(201,154,74,0) 58%),
    linear-gradient(158deg,#1B3A52 0%,#132E47 46%,#0B1B2B 100%);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(11,27,43,0) 42%,rgba(11,27,43,.62));
  pointer-events:none;
}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media__caption{
  position:absolute;
  left:14px;bottom:12px;
  z-index:2;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--gold-light);
}

/* ===== 显影协议（JS 就绪后才生效） ===== */
[data-enhanced="true"] [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
[data-enhanced="true"] [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ===== 响应式：平板 ===== */
@media (max-width:1100px){
  .brand__sub{display:none}
  .site-nav__link{padding:11px 10px;font-size:13.5px}
  .site-nav__link::after{left:10px;right:10px}
  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1.5fr)}
}

/* ===== 响应式：移动导航切换 ===== */
@media (max-width:980px){
  html{scroll-padding-top:88px}
  [id]{scroll-margin-top:88px}
  .header-utility{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    left:0;right:0;top:100%;
    margin-left:0;
    display:none;
    background:linear-gradient(180deg,#0E2135 0%,#0B1B2B 100%);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    box-shadow:0 28px 44px -30px #000;
    max-height:calc(100vh - 78px);
    overflow-y:auto;
  }
  .site-nav[data-open]{
    display:block;
    animation:navDrop .24s var(--ease) both;
  }
  .site-nav__list{flex-direction:column}
  .site-nav__item,
  .site-nav__item:last-child{
    border-left:0;
    border-right:0;
    border-bottom:1px solid rgba(220,229,231,.1);
  }
  .site-nav__link{
    justify-content:flex-start;
    padding:15px var(--pad);
    font-size:16px;
    gap:12px;
  }
  .site-nav__num{font-size:11px}
  .site-nav__link::after{
    left:var(--pad);
    right:auto;
    width:26px;
    bottom:9px;
  }
  .site-nav__meta{
    display:block;
    padding:14px var(--pad) 18px;
    font-family:var(--mono);
    font-size:11.5px;
    letter-spacing:.1em;
    color:var(--mist);
  }
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-legal__links{margin-left:0}
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-10px)}
  to{opacity:1;transform:none}
}

/* ===== 响应式：手机 ===== */
@media (max-width:900px){
  .grid--2,
  .grid--3,
  .grid--split{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  body{font-size:16px}
  .brand__name{font-size:17px;letter-spacing:.1em}
  .brand__mark{width:38px;height:38px;font-size:17px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-meta__inner{flex-direction:column;align-items:flex-start}
  .footer-contact__label{min-width:4.6em}
  .footer-legal{gap:8px 16px;font-size:12px}
  .btn{width:100%}
  .footer-crest__actions .btn{width:auto;flex:1 1 45%}
}

/* ===== 动效偏好 ===== */
@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-enhanced="true"] [data-reveal]{
    opacity:1;
    transform:none;
  }
}