*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse}

:root{
  --paper:#F7F3EA;
  --ink:#14110F;
  --ink-2:#2A2523;
  --paper-warm:#EFE7D8;
  --orange:#E85D2A;
  --orange-soft:#F6C9B4;
  --slate:#5B7A8C;
  --slate-soft:#A9BCC6;
  --map:#D9C9A8;
  --sign:#E9B44C;
  --gutter:clamp(20px,4.2vw,56px);
  --measure:64ch;
  --progress:0;
  --line:1px solid rgba(20,17,15,.14);
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --font-mono:"DIN Alternate","Roboto Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
}

html[data-nav-open]{overflow:hidden}

body{
  background-color:var(--paper);
  background-image:repeating-linear-gradient(0deg,rgba(20,17,15,.028) 0 1px,transparent 1px 34px);
  color:var(--ink);
  font-family:var(--font-serif);
  font-size:clamp(16px,.32vw + 15px,18px);
  line-height:1.85;
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
#main-content{flex:1 0 auto;display:block}
section[id],article[id],[data-section]{scroll-margin-top:104px}

h1,h2,h3,h4,h5{font-family:var(--font-sans);font-weight:900;letter-spacing:-.03em;color:var(--ink);line-height:1.06}
h1{font-size:clamp(44px,7.2vw,118px);line-height:.95}
h2{font-size:clamp(26px,3.6vw,44px)}
h3{font-size:clamp(20px,2vw,26px);letter-spacing:-.015em;line-height:1.22}
h4{font-size:18px;letter-spacing:0;line-height:1.4}
p{max-width:var(--measure)}
strong,b{font-weight:700;color:var(--ink)}
small{font-size:13px}

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

/* ---------- 容器与区块 ---------- */
.container{width:min(1320px,100%);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(44px,6vw,88px)}
.section--tint{background:var(--paper-warm)}
.section--ink{background:var(--ink);color:var(--paper)}
.section--ink h1,.section--ink h2,.section--ink h3,.section--ink h4{color:var(--paper)}
.section--ink p{color:rgba(247,243,234,.86)}

.grid{display:grid;gap:clamp(18px,3vw,36px)}
.grid--split{grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr)}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--thirds{grid-template-columns:repeat(3,minmax(0,1fr))}

.rule{height:1px;border:0;background:rgba(20,17,15,.16)}
.rule--path{height:2px;background:linear-gradient(90deg,var(--orange) 0 64px,rgba(20,17,15,.16) 64px)}

.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;color:var(--slate)}
.eyebrow::before{content:"";display:block;width:26px;height:2px;background:var(--orange)}
.lede{font-size:clamp(17px,1.5vw,21px);line-height:1.75;color:var(--ink-2);max-width:var(--measure)}
.note{display:block;font-size:13px;line-height:1.7;color:var(--slate)}
.annotation{font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;text-transform:uppercase;color:var(--slate);writing-mode:vertical-rl;text-orientation:mixed;line-height:1}

.tag{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;padding:4px 10px;border-radius:999px;background:var(--paper-warm);color:var(--ink-2);border:1px solid rgba(20,17,15,.12)}
.tag--accent{background:var(--orange-soft);border-color:transparent}
.tag--ink{background:var(--ink);color:var(--paper);border-color:transparent}

.metric{display:flex;flex-direction:column;gap:4px}
.metric__value{font-family:var(--font-mono);font-weight:700;font-size:clamp(30px,4vw,52px);line-height:1;letter-spacing:-.03em;color:var(--ink)}
.metric__label{font-family:var(--font-sans);font-size:12px;letter-spacing:.14em;color:var(--slate)}

.prose{max-width:var(--measure)}
.prose > * + *{margin-top:1.1em}
.prose h2{margin-top:2.2em}
.prose h3{margin-top:1.8em}
.prose ul{list-style:disc;padding-left:1.25em}
.prose ol{list-style:decimal;padding-left:1.4em}
.prose li + li{margin-top:.4em}
.prose a{text-decoration:underline;text-decoration-color:var(--orange);text-decoration-thickness:2px;text-underline-offset:3px}
.prose a:hover{color:var(--orange)}
.prose blockquote{border-left:3px solid var(--orange);padding-left:18px;color:var(--ink-2)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-sans);font-weight:700;font-size:15px;line-height:1;padding:14px 22px;border:1px solid transparent;border-radius:999px;transition:background .2s ease,color .2s ease,border-color .2s ease}
.btn::after{content:"→";font-family:var(--font-mono);font-weight:400;transition:transform .22s ease}
.btn:hover::after{transform:translateX(4px)}
.btn--accent{background:var(--orange);color:var(--ink);border-color:var(--orange)}
.btn--accent:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn--ghost{border-color:rgba(20,17,15,.34);color:var(--ink)}
.btn--ghost:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn--ink{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn--ink:hover{background:var(--orange);color:var(--ink);border-color:var(--orange)}
.btn--sm{padding:9px 16px;font-size:13px}

/* ---------- 面包屑 ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--slate);padding-block:18px}
.breadcrumb__link{color:var(--slate);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.breadcrumb__link:hover{color:var(--ink);border-bottom-color:var(--orange)}
.breadcrumb__sep{color:var(--slate-soft)}
.breadcrumb__current{color:var(--ink)}

/* ---------- 图片容器 ---------- */
.media{display:block;position:relative;overflow:hidden;border-radius:4px;background:var(--paper-warm)}
.media__img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/10;filter:saturate(.94)}
.media--wide .media__img{aspect-ratio:21/9}
.media--tall .media__img{aspect-ratio:3/4}
.media--placeholder{background-image:linear-gradient(135deg,var(--map) 0%,var(--paper-warm) 62%);min-height:180px}
.media__caption{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--slate)}

/* ---------- 粘性目录 ---------- */
.toc{position:sticky;top:98px;align-self:start}
.toc__title{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--slate);margin-bottom:14px}
.toc__title::before{content:"";display:block;width:18px;height:1px;background:var(--orange)}
.toc__list{display:flex;flex-direction:column;gap:2px;border-left:1px solid rgba(20,17,15,.16)}
.toc__link{display:block;margin-left:-1px;padding:8px 0 8px 14px;border-left:2px solid transparent;font-family:var(--font-sans);font-size:14px;font-weight:500;color:var(--slate);transition:color .2s ease,border-color .2s ease}
.toc__link:hover{color:var(--ink)}
.toc__link[aria-current="true"]{color:var(--ink);font-weight:700;border-left-color:var(--orange)}

/* ---------- 跳转链接 ---------- */
.skip-link{position:fixed;top:10px;left:10px;z-index:200;transform:translateY(-180%);background:var(--ink);color:var(--paper);padding:11px 18px;border-radius:2px;font-family:var(--font-sans);font-size:14px;font-weight:700;transition:transform .2s ease}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 头部 ---------- */
.site-header{position:sticky;top:0;z-index:80;background:rgba(247,243,234,.95);border-bottom:1px solid rgba(20,17,15,.16)}
.site-header__inner{position:relative;z-index:3;width:min(1320px,100%);margin-inline:auto;padding-inline:var(--gutter);min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:clamp(14px,2vw,32px)}

.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__mark{position:relative;display:grid;place-items:center;width:46px;height:46px;flex:0 0 auto;background:var(--ink);color:var(--paper);border-radius:50% 50% 50% 5px;font-family:var(--font-sans);font-weight:900;font-size:15px;line-height:1;letter-spacing:-.05em;transition:background .22s ease}
.brand__mark::after{content:"";position:absolute;right:-3px;bottom:-3px;width:9px;height:9px;border-radius:50%;background:var(--orange);border:2px solid var(--paper)}
.brand:hover .brand__mark{background:var(--orange);color:var(--ink)}
.brand__text{display:flex;flex-direction:column;gap:3px}
.brand__name{font-family:var(--font-sans);font-weight:900;font-size:17px;line-height:1.1;letter-spacing:-.02em;color:var(--ink)}
.brand__sub{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.22em;text-transform:uppercase;color:var(--slate)}

.site-nav{display:flex;align-items:center;gap:clamp(12px,2vw,32px)}
.site-nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,26px)}
.site-nav__item{display:block}
.site-nav__link{position:relative;display:inline-block;padding:12px 2px;font-family:var(--font-sans);font-size:14px;font-weight:700;letter-spacing:-.01em;line-height:1.2;color:var(--ink-2);transition:color .2s ease}
.site-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:6px;height:2px;background:var(--orange);transform:scaleX(0);transform-origin:0 50%;transition:transform .25s ease}
.site-nav__link:hover{color:var(--ink)}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--ink)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--ink)}
.site-nav__link[aria-current="page"]::before{content:"";position:absolute;left:50%;top:2px;width:5px;height:5px;background:var(--orange);transform:translateX(-50%) rotate(45deg)}

.site-nav__utility{display:flex;align-items:center;gap:8px;padding-left:clamp(10px,2vw,26px);border-left:1px solid rgba(20,17,15,.16)}
.site-nav__pill{display:inline-block;white-space:nowrap;font-family:var(--font-sans);font-size:13px;font-weight:700;padding:8px 14px;border-radius:999px;border:1px solid rgba(20,17,15,.2);color:var(--ink-2);transition:background .2s ease,color .2s ease,border-color .2s ease}
.site-nav__pill:hover{background:var(--paper-warm);border-color:var(--ink);color:var(--ink)}
.site-nav__pill--accent{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.site-nav__pill--accent:hover{background:var(--ink);border-color:var(--ink);color:var(--paper)}

.nav-toggle{display:none;align-items:center;gap:9px;padding:10px 14px;border:1px solid rgba(20,17,15,.24);border-radius:999px;font-family:var(--font-sans);font-size:13px;font-weight:700;color:var(--ink)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle__bar{display:block;width:100%;height:2px;background:var(--ink);transition:transform .22s ease,opacity .22s ease}
.nav-toggle__text{letter-spacing:.04em}
.site-header[data-open] .nav-toggle{background:var(--orange);border-color:var(--orange)}
.site-header[data-open] .nav-toggle__bar:first-child{transform:translateY(3px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar:last-child{transform:translateY(-3px) rotate(-45deg)}

.scroll-path{position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;pointer-events:none}
.scroll-path::after{content:"";display:block;height:100%;background:linear-gradient(90deg,var(--sign),var(--orange));transform:scaleX(var(--progress,0));transform-origin:0 50%;transition:transform .14s linear}

html[data-nav-open]::before{content:"";position:fixed;inset:0;z-index:70;background:rgba(20,17,15,.46)}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;overflow:hidden;background:var(--ink);color:var(--paper);padding-top:clamp(48px,7vw,86px)}
.site-footer::before{content:"";position:absolute;top:0;left:0;width:clamp(120px,22vw,320px);height:4px;background:var(--orange)}
.site-footer__map{position:absolute;inset:0;pointer-events:none;opacity:.5;background-image:linear-gradient(90deg,rgba(217,201,168,.18) 1px,transparent 1px),linear-gradient(0deg,rgba(217,201,168,.18) 1px,transparent 1px);background-size:88px 88px,88px 88px;-webkit-mask-image:radial-gradient(120% 78% at 84% 0%,#000 0%,transparent 66%);mask-image:radial-gradient(120% 78% at 84% 0%,#000 0%,transparent 66%)}
.site-footer__inner{position:relative;width:min(1320px,100%);margin-inline:auto;padding-inline:var(--gutter);padding-bottom:clamp(38px,5vw,64px);display:grid;grid-template-columns:minmax(250px,1.5fr) minmax(140px,.8fr) minmax(140px,.8fr) minmax(220px,1.1fr);gap:clamp(28px,4vw,52px)}

.site-footer__brand{display:flex;flex-direction:column;align-items:flex-start}
.site-footer__wordmark{font-family:var(--font-sans);font-weight:900;font-size:clamp(24px,3vw,34px);line-height:1.05;letter-spacing:-.03em;color:var(--paper);max-width:none}
.site-footer__wordmark::after{content:"";display:block;width:34px;height:3px;margin-top:14px;background:var(--orange)}
.site-footer__summary{margin-top:16px;max-width:27ch;font-size:15px;line-height:1.8;color:var(--slate-soft)}
.site-footer__cta{margin-top:22px}

.site-footer__title{display:flex;align-items:center;gap:8px;margin-bottom:18px;font-family:var(--font-sans);font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--slate-soft)}
.site-footer__title::before{content:"";display:block;width:6px;height:6px;flex:0 0 auto;background:var(--orange)}
.site-footer__list{display:flex;flex-direction:column;gap:10px}
.site-footer__link{display:inline-block;font-family:var(--font-sans);font-size:15px;font-weight:500;color:rgba(247,243,234,.86);transition:color .2s ease,transform .2s ease}
.site-footer__link:hover{color:var(--sign);transform:translateX(4px)}

.site-footer__col--contact{border:1px solid rgba(247,243,234,.16);border-radius:4px;background:rgba(247,243,234,.035);padding:clamp(16px,2vw,22px)}
.site-footer__contact-list{display:flex;flex-direction:column;gap:14px}
.site-footer__contact-item{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 10px}
.site-footer__label{flex:0 0 100%;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--slate-soft)}
.site-footer__value{font-family:var(--font-mono);font-size:12.5px;line-height:1.65;letter-spacing:.02em;color:var(--paper);word-break:break-word}
.site-footer__note{margin-top:16px;font-size:12.5px;line-height:1.75;color:var(--slate-soft);max-width:34ch}

.copy-btn{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;padding:4px 9px;border:1px solid rgba(247,243,234,.28);border-radius:999px;color:var(--paper);transition:background .2s ease,color .2s ease,border-color .2s ease}
.copy-btn:hover{border-color:var(--sign);color:var(--sign)}
.copy-btn:focus-visible{outline-color:var(--sign)}
.copy-btn[data-copied]{background:var(--sign);border-color:var(--sign);color:var(--ink)}

.site-footer__bottom{position:relative;width:min(1320px,100%);margin-inline:auto;padding:18px var(--gutter) 26px;border-top:1px solid rgba(247,243,234,.14);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 26px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--slate-soft)}
.site-footer__copy{max-width:none}
.site-footer__legal{max-width:none}
.site-footer__legal-links{display:flex;flex-wrap:wrap;gap:8px 20px}
.site-footer__legal-link{color:var(--slate-soft);border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.site-footer__legal-link:hover{color:var(--paper);border-bottom-color:var(--orange)}

/* ---------- 响应式 ---------- */
@media (max-width:1100px){
  .brand__sub{display:none}
  .site-nav__link{font-size:13px}
  .site-nav__utility{padding-left:14px}
  .site-nav__pill{padding:7px 11px;font-size:12px}
}

@media (max-width:959px){
  .nav-toggle{display:inline-flex}
  .site-nav{position:fixed;left:0;right:0;bottom:0;z-index:2;flex-direction:column;align-items:stretch;gap:0;padding:26px var(--gutter) calc(26px + env(safe-area-inset-bottom));max-height:84vh;overflow-y:auto;background:var(--ink);color:var(--paper);border-top:3px solid var(--orange);border-radius:18px 18px 0 0;box-shadow:0 -26px 60px -30px rgba(20,17,15,.75);transform:translateY(102%);opacity:0;visibility:hidden;transition:transform .34s cubic-bezier(.22,.61,.36,1),opacity .26s ease,visibility .26s ease}
  .site-header[data-open] .site-nav{transform:translateY(0);opacity:1;visibility:visible}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item + .site-nav__item{border-top:1px solid rgba(247,243,234,.14)}
  .site-nav__link{display:block;padding:15px 4px;font-size:19px;color:var(--paper);letter-spacing:-.02em}
  .site-nav__link::after{bottom:9px;background:var(--orange)}
  .site-nav__link:hover,.site-nav__link:focus-visible{color:var(--sign)}
  .site-nav__link[aria-current="page"]{color:var(--sign)}
  .site-nav__link[aria-current="page"]::after{background:var(--sign)}
  .site-nav__link[aria-current="page"]::before{left:auto;right:2px;top:50%;transform:translateY(-50%) rotate(45deg);background:var(--sign)}
  .site-nav__utility{flex-direction:row;flex-wrap:wrap;margin-top:20px;padding:20px 0 0;border-left:0;border-top:1px solid rgba(247,243,234,.14)}
  .site-nav__pill{border-color:rgba(247,243,234,.3);color:var(--paper)}
  .site-nav__pill:hover{background:rgba(247,243,234,.12);border-color:var(--paper);color:var(--paper)}
  .site-nav__pill--accent{background:var(--orange);border-color:var(--orange);color:var(--ink)}
  .site-nav__pill--accent:hover{background:var(--sign);border-color:var(--sign);color:var(--ink)}
  .site-header__inner{min-height:66px}
  .brand__mark{width:40px;height:40px;font-size:13px}
  .brand__name{font-size:16px}

  .site-footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .site-footer__brand{grid-column:1 / -1}
  .site-footer__col--contact{grid-column:1 / -1}
  .site-footer__bottom{flex-direction:column;align-items:flex-start;gap:12px}

  .grid--split,.grid--halves,.grid--thirds{grid-template-columns:minmax(0,1fr)}
  .toc{position:static;top:auto;margin-bottom:8px}
  .toc__list{flex-direction:row;overflow-x:auto;border-left:0;gap:6px;padding-bottom:8px;scrollbar-width:thin}
  .toc__link{margin-left:0;padding:7px 12px;border-left:0;border-bottom:2px solid transparent;border-radius:999px;background:var(--paper-warm);white-space:nowrap;font-size:13px}
  .toc__link[aria-current="true"]{background:var(--orange-soft);border-bottom-color:var(--orange)}
  .annotation{writing-mode:horizontal-tb;letter-spacing:.16em}
}

@media (max-width:600px){
  .site-footer__inner{grid-template-columns:minmax(0,1fr)}
  .site-footer__bottom{font-size:11px}
  .btn{padding:12px 18px;font-size:14px}
  .site-footer__value{font-size:12px}
}

@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-path::after{transition:none}
}