/* ===== 1. 设计变量 ===== */
:root{
  --ink:#0E2A24;
  --ink-700:#163F35;
  --ink-500:#245C4E;
  --brass:#C08A3E;
  --brass-soft:#E4C08A;
  --paper:#F4EFE4;
  --paper-2:#E8E0D2;
  --cinnabar:#B4473A;
  --black:#1B1F1C;
  --sage:#6E7C74;
  --glass:rgba(244,239,228,.72);
  --line:rgba(27,31,28,.14);
  --line-brass:rgba(192,138,62,.3);
  --line-paper:rgba(228,192,138,.22);
  --shadow:0 20px 42px -30px rgba(14,42,36,.6);
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"IBM Plex Mono","SFMono-Regular",Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --w:1180px;
  --gutter:clamp(20px,5vw,64px);
  --radius:2px;
}

/* ===== 2. Reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
:focus-visible{outline:2px solid var(--brass);outline-offset:3px}

/* ===== 3. 中文排版与页基底 ===== */
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  font-size:clamp(15px,1.02vw,17px);
  line-height:1.75;
  color:var(--black);
  background-color:var(--paper);
  background-image:repeating-linear-gradient(90deg,rgba(27,31,28,.018) 0 1px,transparent 1px 5px);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.26;
  letter-spacing:-.01em;
  text-wrap:balance;
}
h1{font-size:clamp(30px,4.4vw,56px)}
h2{font-size:clamp(24px,3vw,38px)}
h3{font-size:clamp(18px,1.7vw,24px)}
p{text-wrap:pretty}
strong{font-weight:600}

/* ===== 4. 容器与网格 ===== */
.container{
  width:100%;
  max-width:var(--w);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(24px,3.4vw,44px)}
.section--dark{background:var(--ink);color:var(--paper)}
.section--paper{background:var(--paper-2)}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.2vw,32px)}
.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}

/* ===== 5. 索引、正文工具 ===== */
.index-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--brass);
  margin-bottom:14px;
}
.index-label::before{content:"";width:22px;height:1px;background:currentColor;flex:0 0 auto}
.section--dark .index-label,
.panel--ink .index-label{color:var(--brass-soft)}
.mono{font-family:var(--font-mono);font-size:.84em;letter-spacing:.08em}
.lead{
  font-size:clamp(17px,1.5vw,21px);
  line-height:1.7;
  color:var(--ink-700);
  max-width:38em;
}
.section--dark .lead{color:rgba(244,239,228,.82)}
.prose{max-width:40em;line-height:1.85}
.prose p + p{margin-top:1.1em}
.prose h3{margin-top:1.8em;margin-bottom:.55em}
.prose li{position:relative;padding-left:1.4em;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:8px;height:1px;background:var(--brass)}

/* ===== 6. 按钮与标签 ===== */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  padding:.82em 1.4em;
  border:1px solid transparent;
  border-radius:var(--radius);
  font-size:14px;
  font-weight:600;
  letter-spacing:.06em;
  text-decoration:none;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn--brass{background:var(--brass);color:var(--ink)}
.btn--brass:hover{background:var(--brass-soft)}
.btn--ghost{border-color:rgba(228,192,138,.5);color:var(--brass-soft)}
.btn--ghost:hover{background:rgba(228,192,138,.14);border-color:var(--brass)}
.tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  padding:4px 9px;
  border:1px solid var(--brass);
  color:var(--brass);
  text-transform:uppercase;
}
.tag--alert{border-color:var(--cinnabar);color:var(--cinnabar)}

/* ===== 7. 面包屑 ===== */
.breadcrumb{border-bottom:1px solid var(--line);background:rgba(232,224,210,.5)}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  max-width:var(--w);
  margin-inline:auto;
  padding:14px var(--gutter);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--sage);
}
.breadcrumb__item + .breadcrumb__item::before{content:"/";margin:0 9px;color:var(--brass);opacity:.8}
.breadcrumb__link{color:var(--ink-500);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .2s}
.breadcrumb__link:hover{border-bottom-color:var(--brass)}

/* ===== 8. 面板、玻璃层、路线轴、图片容器 ===== */
.panel{
  background:var(--paper);
  border:1px solid var(--line);
  border-left:3px solid var(--brass);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:var(--shadow);
}
.panel--ink{
  background:var(--ink-700);
  color:var(--paper);
  border-color:transparent;
  border-left-color:var(--brass-soft);
  box-shadow:none;
}
.glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border:1px solid rgba(27,31,28,.08);
  border-radius:var(--radius);
}
.route-axis{list-style:none;margin:0;padding:0;border-left:1px solid var(--line-brass)}
.route-axis__item{position:relative;padding:0 0 24px 24px}
.route-axis__item::before{
  content:"";
  position:absolute;
  left:-4px;
  top:.6em;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--brass);
}
.route-axis__item:last-child{padding-bottom:0}
.route-axis__num{
  display:block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--brass);
  margin-bottom:4px;
}
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/10;
  background:var(--ink-700);
  border:1px solid var(--line-brass);
  border-radius:var(--radius);
}
.media-frame img{width:100%;height:100%;object-fit:cover;display:block}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__caption{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:10px 14px;
  background:var(--glass);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  color:var(--black);
  font-size:12px;
  line-height:1.6;
  border-top:1px solid rgba(192,138,62,.35);
}

/* ===== 9. 显现动效 ===== */
[data-reveal]{transition:opacity .5s var(--ease),transform .5s var(--ease)}
html[data-reveal-ready] [data-reveal]:not(.is-in){opacity:0;transform:translateY(16px)}
[data-reveal].is-in{opacity:1;transform:none}

/* ===== 10. 跳转链接 ===== */
.skip-link{
  position:absolute;
  left:14px;
  top:-70px;
  z-index:300;
  padding:10px 18px;
  background:var(--brass);
  color:var(--ink);
  font-size:14px;
  font-weight:600;
  text-decoration:none;
  border-radius:var(--radius);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

/* ===== 11. 页头 ===== */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  box-shadow:0 10px 30px -26px rgba(14,42,36,.9);
}
.masthead{
  background:var(--ink);
  background-image:repeating-linear-gradient(90deg,rgba(244,239,228,.03) 0 1px,transparent 1px 7px);
  color:var(--paper);
  border-bottom:1px solid rgba(228,192,138,.16);
}
.masthead__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,34px);
  width:100%;
  max-width:var(--w);
  margin-inline:auto;
  padding:13px var(--gutter);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  color:var(--paper);
}
.brand__mark{
  position:relative;
  flex:0 0 auto;
  width:32px;
  height:32px;
  border:1px solid var(--brass);
  border-radius:var(--radius);
  display:grid;
  place-items:center;
}
.brand__mark::before{
  content:"";
  width:15px;
  height:1px;
  background:var(--brass);
  transform:rotate(-45deg);
}
.brand__mark::after{
  content:"";
  position:absolute;
  right:4px;
  bottom:4px;
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--cinnabar);
}
.brand__text{display:flex;flex-direction:column}
.brand__name{
  font-family:var(--font-display);
  font-weight:700;
  font-size:17px;
  line-height:1.2;
  letter-spacing:.06em;
}
.brand__line{
  margin-top:3px;
  font-size:11.5px;
  line-height:1.4;
  letter-spacing:.04em;
  color:rgba(244,239,228,.6);
}
.resp{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin:0 0 0 auto;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--brass-soft);
  white-space:nowrap;
}
.resp__dot{
  flex:0 0 auto;
  width:7px;
  height:7px;
  background:var(--brass);
  transform:rotate(45deg);
  animation:resp-pulse 3.2s ease-in-out infinite;
}
@keyframes resp-pulse{
  0%,100%{opacity:1}
  50%{opacity:.35}
}
.header-cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  padding:9px 18px;
  background:var(--brass);
  color:var(--ink);
  font-size:13px;
  font-weight:600;
  letter-spacing:.1em;
  text-decoration:none;
  border-radius:var(--radius);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.header-cta:hover{background:var(--brass-soft)}
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 12px;
  border:1px solid rgba(228,192,138,.45);
  border-radius:var(--radius);
  color:var(--brass-soft);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(228,192,138,.12);border-color:var(--brass)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:10px;
  flex:0 0 auto;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:1px;
  background:currentColor;
  transition:transform .22s var(--ease),top .22s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:9px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

.route-nav{
  background:var(--ink-700);
  border-top:1px solid rgba(228,192,138,.14);
  color:var(--paper);
}
.route-nav__inner{
  width:100%;
  max-width:var(--w);
  margin-inline:auto;
  padding-inline:clamp(6px,1.4vw,16px);
}
.route-nav__list{display:flex;flex-wrap:wrap;align-items:stretch}
.route-nav__item{display:flex}
.route-nav__link{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:8px;
  padding:13px clamp(10px,1.5vw,20px) 14px;
  color:rgba(244,239,228,.76);
  font-size:13.5px;
  line-height:1.3;
  letter-spacing:.02em;
  text-decoration:none;
  transition:color .2s var(--ease);
}
.route-nav__link::after{
  content:"";
  position:absolute;
  left:10%;
  right:10%;
  bottom:0;
  height:2px;
  background:var(--brass);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .28s var(--ease);
}
.route-nav__link:hover,
.route-nav__link:focus-visible{color:var(--paper)}
.route-nav__link:hover::after,
.route-nav__link:focus-visible::after{transform:scaleX(1)}
.route-nav__link[aria-current="page"]{color:var(--paper);font-weight:500}
.route-nav__link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--brass-soft);
}
.route-nav__link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:50%;
  top:5px;
  width:6px;
  height:6px;
  margin-left:-3px;
  border-radius:50%;
  background:var(--cinnabar);
}
.route-nav__idx{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--brass);
  flex:0 0 auto;
}
.route-nav__link[aria-current="page"] .route-nav__idx{color:var(--brass-soft)}
.route-nav__label{display:inline}
.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:rgba(228,192,138,.14);
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--brass),var(--brass-soft));
  transition:width .12s linear;
}

/* ===== 12. 页脚 ===== */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--paper);
  border-top:2px solid var(--brass);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(90deg,rgba(244,239,228,.035) 0 1px,transparent 1px 6px);
  pointer-events:none;
}
.site-footer > *{position:relative;z-index:1}
.footer__top{padding-block:clamp(44px,6vw,80px) clamp(28px,4vw,48px)}
.footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:clamp(24px,3.4vw,48px);
}
.footer__brand .index-label{color:var(--brass-soft)}
.footer__name{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(22px,2.4vw,28px);
  letter-spacing:.05em;
  line-height:1.3;
}
.footer__summary{
  margin-top:12px;
  max-width:34ch;
  font-size:14px;
  line-height:1.85;
  color:rgba(244,239,228,.7);
}
.footer__meta{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--brass-soft);
}
.footer__meta .mono{color:var(--brass);margin-right:8px}
.footer__col-title{
  padding-bottom:12px;
  margin-bottom:16px;
  border-bottom:1px solid rgba(228,192,138,.2);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--brass-soft);
}
.footer__list li + li{margin-top:10px}
.footer__link{
  position:relative;
  display:inline-block;
  padding-left:0;
  font-size:14px;
  line-height:1.6;
  color:rgba(244,239,228,.74);
  text-decoration:none;
  transition:color .2s var(--ease),padding-left .22s var(--ease);
}
.footer__link::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:0;
  height:1px;
  background:var(--brass);
  transition:width .22s var(--ease);
}
.footer__link:hover,
.footer__link:focus-visible{color:var(--paper);padding-left:16px}
.footer__link:hover::before,
.footer__link:focus-visible::before{width:10px}
.footer__contact{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
  padding:clamp(20px,2.6vw,28px);
  background:rgba(244,239,228,.06);
  border:1px solid rgba(228,192,138,.22);
  border-radius:var(--radius);
}
.footer__contact-item{display:flex;flex-direction:column;gap:7px;min-width:0}
.footer__contact-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--brass-soft);
}
.footer__contact-value{
  font-size:14px;
  line-height:1.7;
  color:rgba(244,239,228,.86);
  overflow-wrap:anywhere;
}
.footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 24px;
  margin-top:clamp(24px,3vw,36px);
  padding-block:22px;
  border-top:1px solid rgba(228,192,138,.18);
}
.footer__legal{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:rgba(244,239,228,.6);
}
.footer__legal--dim{color:rgba(244,239,228,.42)}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border:1px solid rgba(228,192,138,.4);
  border-radius:var(--radius);
  color:var(--brass-soft);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.to-top:hover{background:rgba(228,192,138,.14);border-color:var(--brass);color:var(--paper)}

/* ===== 13. 响应式 ===== */
@media (max-width:1100px){
  .footer__grid{grid-template-columns:1.4fr 1fr 1fr;row-gap:32px}
  .footer__brand{grid-column:1/-1}
}
@media (max-width:960px){
  .footer__contact{grid-template-columns:1fr 1fr}
}
@media (max-width:920px){
  .grid-12 .col-4,
  .grid-12 .col-5,
  .grid-12 .col-6,
  .grid-12 .col-7,
  .grid-12 .col-8{grid-column:span 12}
  .nav-toggle{display:inline-flex;order:2}
  .brand{flex:1 1 auto;order:1}
  .header-cta{order:3;flex:0 0 auto;padding:8px 14px;font-size:12.5px}
  .resp{order:4;flex:1 1 100%;margin:0;font-size:11px;white-space:normal;line-height:1.5}
  .masthead__inner{flex-wrap:wrap;row-gap:10px;padding-block:12px}
  .route-nav{max-height:0;overflow:hidden;transition:max-height .32s var(--ease)}
  .route-nav[data-open="true"]{max-height:min(72vh,560px);overflow-y:auto}
  .route-nav__inner{padding-inline:0}
  .route-nav__list{flex-direction:column}
  .route-nav__item{display:block;border-bottom:1px solid rgba(228,192,138,.12)}
  .route-nav__item:last-child{border-bottom:0}
  .route-nav__link{width:100%;padding:15px var(--gutter)}
  .route-nav__link::after{left:var(--gutter);right:auto;width:30px}
  .route-nav__link[aria-current="page"]::before{
    left:calc(var(--gutter) - 12px);
    top:50%;
    margin-left:0;
    transform:translateY(-50%);
  }
}
@media (max-width:720px){
  .brand__line{display:none}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__contact{grid-template-columns:1fr}
  .footer__base{justify-content:flex-start}
}
@media (max-width:560px){
  .footer__grid{grid-template-columns:1fr}
  .header-cta{display:none}
  .media-frame--tall{aspect-ratio:4/5}
}

/* ===== 14. 降低动态 ===== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .resp__dot{animation:none}
  .scroll-progress__bar{transition:none}
}