/* ============ 基础重置 ============ */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;tab-size:4}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol,fieldset{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0}

/* ============ 变量 ============ */
:root{
  --ink:#0B0D0E;
  --ink-2:#141719;
  --ink-3:#1B2124;
  --gold:#C9A24B;
  --gold-bright:#E7C879;
  --paper:#F2E9D8;
  --ivory:#FFF9EF;
  --jade:#3E7A66;
  --jade-text:#7FBFA6;
  --amber:#C47A2C;
  --amber-text:#F0C089;
  --slate:#7C8A96;
  --brown:#2A2018;
  --red:#A94A3F;
  --red-text:#E7A79D;
  --line:rgba(201,162,75,.22);
  --line-strong:rgba(201,162,75,.44);
  --line-soft:rgba(255,249,239,.10);
  --glass:rgba(20,23,25,.74);
  --rail-w:272px;
  --topbar-h:56px;
  --gutter:20px;
  --page-max:1280px;
  --sp-1:.25rem;--sp-2:.5rem;--sp-3:.75rem;--sp-4:1rem;
  --sp-5:1.5rem;--sp-6:2rem;--sp-7:3rem;--sp-8:4.5rem;
  --radius:2px;
  --ease:cubic-bezier(.22,1,.36,1);
  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Songti SC","Source Han Serif SC","Noto Serif CJK SC",Georgia,"Times New Roman",serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --font-latin:"Inter","Manrope","Helvetica Neue",Arial,sans-serif;
}

/* ============ 画布与排版 ============ */
body{
  margin:0;
  padding-top:var(--topbar-h);
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 620px at 88% -8%,rgba(201,162,75,.10),transparent 68%),
    radial-gradient(900px 540px at 2% 44%,rgba(62,122,102,.07),transparent 70%);
  background-repeat:no-repeat;
  color:var(--ivory);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:800;line-height:1.2;letter-spacing:-.01em}
p{text-wrap:pretty}
[id]{scroll-margin-top:calc(var(--topbar-h) + 24px)}
:focus-visible{outline:2px solid var(--gold-bright);outline-offset:3px;border-radius:var(--radius)}
::selection{background:rgba(201,162,75,.35);color:var(--ivory)}

.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}

/* 跳转链 */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:10px 18px;
  background:var(--gold);color:#12100A;
  font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:.04em;
  border-radius:var(--radius);
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ============ 头部外壳 ============ */
.site-header{position:relative;z-index:40}

.topbar{
  position:fixed;top:0;left:0;right:0;
  height:var(--topbar-h);
  z-index:60;
  background:rgba(11,13,14,.84);
  -webkit-backdrop-filter:blur(14px) saturate(120%);
  backdrop-filter:blur(14px) saturate(120%);
  border-bottom:1px solid var(--line);
}
.topbar__inner{
  display:flex;align-items:center;gap:10px;
  height:100%;padding:0 var(--gutter);
}
.topbar__brand{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-display);font-weight:800;font-size:13px;
  letter-spacing:.03em;color:var(--ivory);white-space:nowrap;
  transition:color .25s var(--ease);
}
.topbar__brand:hover{color:var(--gold-bright)}
.topbar__brand-mark{
  flex:0 0 auto;width:9px;height:9px;
  background:linear-gradient(135deg,var(--gold-bright),var(--gold));
  transform:rotate(45deg);
  box-shadow:0 0 10px rgba(201,162,75,.55);
}
.topbar__utility{
  display:none;
  margin-left:var(--sp-5);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--slate);white-space:nowrap;
}
.topbar__cta{
  margin-left:auto;
  display:inline-flex;align-items:center;
  padding:6px 11px;
  border:1px solid var(--line-strong);border-radius:var(--radius);
  font-family:var(--font-display);font-size:12px;font-weight:600;letter-spacing:.04em;
  color:var(--gold-bright);white-space:nowrap;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.topbar__cta:hover{background:var(--gold);border-color:var(--gold);color:#12100A}

/* 抽屉按钮 */
.nav-toggle{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 10px;
  border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(201,162,75,.07);
  color:var(--gold-bright);
  transition:background .25s var(--ease),border-color .25s var(--ease);
}
.nav-toggle:hover{background:rgba(201,162,75,.16);border-color:var(--line-strong)}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{
  display:block;height:1.5px;background:currentColor;
  transition:transform .28s var(--ease),opacity .18s linear;
}
.nav-toggle__text{font-family:var(--font-display);font-size:11px;font-weight:600;letter-spacing:.08em}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* 阅读进度 */
.read-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  overflow:hidden;background:rgba(201,162,75,.12);
}
.read-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--jade),var(--gold) 55%,var(--gold-bright));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .1s linear;
}

/* 遮罩 */
.nav-backdrop{
  position:fixed;top:var(--topbar-h);left:0;right:0;bottom:0;
  z-index:52;
  background:rgba(4,6,7,.66);
  opacity:0;pointer-events:none;
  transition:opacity .28s var(--ease);
}
.site-header[data-open] .nav-backdrop{opacity:1;pointer-events:auto}

/* 侧边轨道 / 移动抽屉 */
.rail{
  position:fixed;top:var(--topbar-h);left:0;bottom:0;
  z-index:55;
  width:min(320px,86vw);
  display:flex;flex-direction:column;gap:var(--sp-5);
  padding:22px 20px 28px;
  overflow-y:auto;
  background:linear-gradient(180deg,rgba(20,23,25,.97),rgba(11,13,14,.99));
  border-right:1px solid var(--line);
  box-shadow:24px 0 60px rgba(0,0,0,.5);
  transform:translateX(-101%);
  transition:transform .28s var(--ease);
}
.site-header[data-open] .rail{transform:translateX(0)}

.rail__label{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  color:var(--gold);text-transform:uppercase;
}
.rail__label::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--line),transparent)}
.rail__list{display:flex;flex-direction:column;border-top:1px solid var(--line-soft)}
.rail__item{border-bottom:1px solid var(--line-soft)}
.rail__link{
  position:relative;
  display:grid;grid-template-columns:2.4em 1fr;align-items:baseline;
  padding:12px 10px 12px 12px;
  font-family:var(--font-display);font-size:15px;font-weight:500;
  color:rgba(255,249,239,.82);
  transition:color .25s var(--ease),background .25s var(--ease);
}
.rail__link::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--gold-bright),var(--gold));
  transform:scaleY(0);transform-origin:50% 0;
  transition:transform .32s var(--ease);
}
.rail__link:hover{color:var(--gold-bright);background:rgba(201,162,75,.07)}
.rail__link:hover::before{transform:scaleY(1)}
.rail__link[aria-current="page"]{
  color:var(--gold-bright);font-weight:700;
  background:linear-gradient(90deg,rgba(201,162,75,.16),rgba(201,162,75,0) 78%);
}
.rail__link[aria-current="page"]::before{transform:scaleY(1)}
.rail__no{
  font-family:var(--font-mono);font-size:11px;font-weight:400;
  letter-spacing:.12em;color:var(--slate);
}
.rail__link[aria-current="page"] .rail__no{color:var(--gold)}
.rail__name{display:block}
.rail__foot{margin-top:auto;padding-top:var(--sp-5);border-top:1px solid var(--line-soft)}
.rail__note{
  font-family:var(--font-mono);font-size:11px;line-height:1.8;
  letter-spacing:.08em;color:var(--slate);
}
.rail__action{
  display:block;margin-top:12px;padding:10px 12px;
  border:1px solid var(--line);border-radius:var(--radius);
  text-align:center;
  font-family:var(--font-display);font-size:12px;font-weight:600;letter-spacing:.08em;
  color:var(--gold-bright);
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.rail__action:hover{background:var(--gold);border-color:var(--gold);color:#12100A}

@media (max-width:1079px){
  html.nav-open,html.nav-open body{overflow:hidden}
}
@media (min-width:768px){
  :root{--gutter:32px}
  .topbar__brand{font-size:15px}
  .topbar__cta{font-size:13px;padding:7px 14px}
}
@media (min-width:1080px){
  :root{--gutter:64px}
  body{padding-left:var(--rail-w)}
  .topbar{left:var(--rail-w)}
  .topbar__utility{display:block}
  .nav-toggle{display:none}
  .nav-backdrop{display:none}
  .rail{
    top:0;width:var(--rail-w);
    padding-top:calc(var(--topbar-h) + 30px);
    transform:none;
    box-shadow:none;
    z-index:50;
  }
  .site-header[data-open] .rail{transform:none}
}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:96px;
  padding:56px var(--gutter) 24px;
  background:linear-gradient(180deg,var(--ink) 0%,#101314 42%,var(--brown) 100%);
  border-top:1px solid var(--line);
}
.has-side-rail .site-footer{}
.footer__inner{
  max-width:var(--page-max);margin:0 auto;
  display:grid;grid-template-columns:minmax(0,1fr);gap:var(--sp-6);
}
.footer__brand{display:flex;flex-direction:column;gap:10px}
.footer__mark{
  font-family:var(--font-display);font-size:22px;font-weight:800;
  letter-spacing:.02em;color:var(--ivory);
}
.footer__tagline{
  font-family:var(--font-body);font-size:16px;letter-spacing:.06em;
  color:var(--gold-bright);
}
.footer__trust{
  max-width:24em;font-size:13px;line-height:1.8;
  color:rgba(255,249,239,.66);
}
.footer__note{
  margin-top:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--slate);text-transform:uppercase;
}
.footer__col{min-width:0}
.footer__title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;color:var(--gold);text-transform:uppercase;
}
.footer__list li + li{margin-top:10px}
.footer__link{
  position:relative;display:inline-block;padding-bottom:2px;
  font-family:var(--font-display);font-size:14px;font-weight:500;
  color:rgba(255,249,239,.78);
  transition:color .25s var(--ease);
}
.footer__link::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;
  background:var(--gold-bright);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .6s var(--ease);
}
.footer__link:hover{color:var(--gold-bright)}
.footer__link:hover::after{transform:scaleX(1)}
.footer__link[aria-current="page"]{color:var(--gold-bright);font-weight:700}
.footer__link[aria-current="page"]::after{transform:scaleX(1)}
.footer__contact{display:flex;flex-direction:column;gap:8px}
.footer__contact-line{
  font-size:13px;line-height:1.8;color:rgba(255,249,239,.72);
  overflow-wrap:anywhere;
}
.footer__contact-line--note{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--slate);
}
.footer__base{
  max-width:var(--page-max);margin:40px auto 0;padding-top:18px;
  border-top:1px solid rgba(255,249,239,.08);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
}
.footer__legal,.footer__meta{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--slate);line-height:1.8;
}
.footer__meta{overflow-wrap:anywhere}
.to-top{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;
  border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-display);font-size:12px;font-weight:600;letter-spacing:.08em;
  color:var(--gold-bright);
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.to-top::before{content:"";width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-bottom:6px solid currentColor}
.to-top:hover{background:var(--gold);border-color:var(--gold);color:#12100A}
@media (min-width:768px){
  .footer__inner{grid-template-columns:1.4fr 1fr 1fr;gap:var(--sp-6) var(--sp-5)}
  .footer__brand{grid-column:1 / -1}
}
@media (min-width:1080px){
  .site-footer{padding-top:72px}
  .footer__inner{grid-template-columns:1.7fr .8fr .9fr 1.15fr;gap:var(--sp-7)}
  .footer__brand{grid-column:auto}
}

/* ============ 页面容器与通用组件 ============ */
.page-main{display:block;min-height:60vh}
.container{width:100%;max-width:var(--page-max);margin-inline:auto;padding-inline:var(--gutter)}
.prose{max-width:46em}
.prose p + p{margin-top:1.2em}

.display-title{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(2rem,5.6vw + .8rem,5.5rem);
  line-height:1.06;letter-spacing:-.025em;
  color:var(--ivory);
}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  color:var(--gold);text-transform:uppercase;
}
.lede{
  font-family:var(--font-body);
  font-size:clamp(1rem,1.5vw,1.2rem);
  line-height:1.85;color:rgba(255,249,239,.80);
  max-width:34em;
}
.rule{
  height:1px;border:0;margin-block:var(--sp-6);
  background:linear-gradient(90deg,var(--line-strong),var(--line-soft) 60%,transparent);
}
.section-head{display:grid;gap:8px;padding-top:var(--sp-4)}
.section-head__no{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  color:var(--gold);
}
.section-head__title{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(1.5rem,2.6vw,2.4rem);
  letter-spacing:-.02em;color:var(--ivory);
}
.section-head__note{font-size:14px;line-height:1.8;color:var(--slate);max-width:38em}

/* 按钮 */
.btn{
  position:relative;display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;
  border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-display);font-size:14px;font-weight:600;letter-spacing:.04em;
  color:var(--ivory);
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--gold{
  background:linear-gradient(180deg,var(--gold-bright),var(--gold));
  border-color:transparent;color:#14100A;
  box-shadow:0 8px 24px rgba(201,162,75,.18);
}
.btn--gold:hover{background:linear-gradient(180deg,#F2D793,var(--gold-bright))}
.btn--ghost{background:rgba(201,162,75,.06);border-color:var(--line-strong);color:var(--gold-bright)}
.btn--ghost:hover{background:rgba(201,162,75,.16);border-color:var(--gold);color:var(--gold-bright)}
.btn--quiet{border-color:transparent;padding-inline:0;color:var(--gold-bright)}
.btn.is-copied{color:var(--jade-text);border-color:rgba(62,122,102,.65);background:rgba(62,122,102,.16)}

.link-underline{
  position:relative;display:inline-block;padding-bottom:3px;
  color:var(--gold-bright);
}
.link-underline::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;
  background:linear-gradient(90deg,var(--gold),var(--gold-bright));
  transform:scaleX(1);transform-origin:0 50%;
}
.link-underline:hover::after,.link-underline:focus-visible::after{
  animation:sweep .6s var(--ease);
}
@keyframes sweep{from{transform:scaleX(0)}to{transform:scaleX(1)}}

/* 标签 */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(201,162,75,.08);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--gold-bright);text-transform:uppercase;
}
.tag--jade{border-color:rgba(62,122,102,.55);background:rgba(62,122,102,.18);color:var(--jade-text)}
.tag--amber{border-color:rgba(196,122,44,.55);background:rgba(196,122,44,.20);color:var(--amber-text)}
.tag--red{border-color:rgba(169,74,63,.6);background:rgba(169,74,63,.20);color:var(--red-text)}
.tag--mute{border-color:var(--line-soft);background:transparent;color:var(--slate)}

/* 展签面 */
.plate{position:relative;padding:var(--sp-5) 0;border-top:1px solid var(--line)}
.plate--paper{
  padding:var(--sp-6) var(--sp-5);
  background:var(--paper);color:var(--ink);
  border-top:0;border-radius:var(--radius);
}
.plate--paper .section-head__title,.plate--paper .display-title{color:var(--ink)}
.plate--glass{
  padding:var(--sp-5);
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
  border:1px solid var(--line-soft);border-radius:var(--radius);
}

/* 网格 */
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-4,.col-6,.col-8,.col-12{grid-column:span 12}
@media (min-width:768px){
  .col-6{grid-column:span 6}
  .col-4{grid-column:span 6}
}
@media (min-width:1080px){
  .col-4{grid-column:span 4}
  .col-6{grid-column:span 6}
  .col-8{grid-column:span 8}
}

/* 面包屑 */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin-bottom:var(--sp-5);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--slate);
}
.breadcrumb__link{color:var(--slate);transition:color .25s var(--ease)}
.breadcrumb__link:hover{color:var(--gold-bright)}
.breadcrumb__sep{color:rgba(124,138,150,.55)}
.breadcrumb__current{color:var(--gold-bright)}

/* 图片容器 */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:
    linear-gradient(145deg,var(--ink-2) 0%,var(--ink) 56%,var(--brown) 100%);
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__img{
  width:100%;height:100%;object-fit:cover;
  transform:scale(1.02);
  transition:transform .9s var(--ease);
}
.media-frame:hover .media-frame__img{transform:scale(1.04)}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:24px 16px 12px;
  background:linear-gradient(180deg,transparent,rgba(11,13,14,.86));
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:rgba(255,249,239,.78);
}
@media (max-width:767px){
  .media-frame{aspect-ratio:16/9}
}

/* 页面内目录高亮 */
[data-spy]{position:relative;transition:color .25s var(--ease)}
[data-spy].is-current{color:var(--gold-bright);font-weight:700}
[data-spy].is-current::before{
  content:"";position:absolute;left:-14px;top:.62em;width:5px;height:5px;
  background:var(--gold-bright);border-radius:50%;
}

/* ============ 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;
    scroll-behavior:auto!important;
  }
  .media-frame__img,.media-frame:hover .media-frame__img{transform:none}
}