/* ============================================================
   盛兴客户端 · 共享样式 /assets/site.css
   ============================================================ */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
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;width:100%}
[hidden]{display:none!important}

/* ---------- 2. 变量 ---------- */
:root{
  --c-cream:#F5EFE3;
  --c-paper:#FCF8F0;
  --c-ink:#221C15;
  --c-orange:#E2703A;
  --c-terracotta:#B4523A;
  --c-terracotta-deep:#93402C;
  --c-mist:#8AA79C;
  --c-deep:#223F4D;
  --c-silver:#BFB9AE;
  --c-muted:#6E655A;
  --c-amber:#D9A24A;

  --line:1px solid var(--c-silver);
  --line-ink:1px solid var(--c-ink);

  --font-ui:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --shell:1120px;
  --gutter:24px;
  --rail:56px;
  --radius-s:8px;
  --radius-m:14px;
  --radius-l:22px;

  --paper-shadow:8px 8px 0 rgba(138,167,156,.24);
  --paper-shadow-warm:8px 8px 0 rgba(226,112,58,.22);
  --paper-shadow-deep:8px 8px 0 rgba(34,63,77,.24);
}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--c-cream);
  color:var(--c-ink);
  font-family:var(--font-ui);
  font-size:17px;
  font-weight:500;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
p{max-width:42em}
h1,h2,h3,h4{color:var(--c-ink);font-family:var(--font-ui)}
h1{font-size:clamp(40px,7vw,96px);font-weight:900;line-height:1.05;letter-spacing:-.01em}
h2{font-size:clamp(28px,3.4vw,44px);font-weight:900;line-height:1.14;letter-spacing:-.005em}
h3{font-size:clamp(20px,1.7vw,24px);font-weight:700;line-height:1.32}
h4{font-size:17px;font-weight:700;line-height:1.45}
strong,b{font-weight:800}
em{font-style:normal;color:var(--c-terracotta-deep);font-weight:700}
::selection{background:var(--c-amber);color:var(--c-ink)}
:focus-visible{outline:2px solid var(--c-terracotta);outline-offset:3px;border-radius:3px}

.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:500;letter-spacing:.01em}
.index-caption{font-size:12.5px;letter-spacing:.12em;font-weight:600;color:var(--c-muted)}
.lede{font-size:clamp(17px,1.4vw,20px);line-height:1.85;color:var(--c-muted);max-width:34em}
.rule{height:1px;background:var(--c-silver);border:0;margin:0}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}

/* ---------- 4. skip link ---------- */
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:200;
  background:var(--c-ink);color:var(--c-cream);
  padding:10px 18px;border-radius:var(--radius-s);
  font-size:14px;font-weight:700;letter-spacing:.04em;
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:var(--c-cream);
}
.site-header::before{
  content:"";display:block;height:3px;
  background:linear-gradient(90deg,var(--c-orange) 0 88px,var(--c-ink) 88px 100%);
}
.site-header::after{content:"";display:block;height:1px;background:var(--c-silver)}

.header-bar{
  position:relative;z-index:5;
  max-width:var(--shell);margin:0 auto;
  padding:14px var(--gutter);
  display:flex;align-items:center;gap:18px;
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.brand__seal{
  width:40px;height:40px;border-radius:12px;
  background:var(--c-ink);color:var(--c-cream);
  display:grid;place-items:center;
  font-size:20px;font-weight:900;line-height:1;
  box-shadow:3px 3px 0 var(--c-orange);
}
.brand__words{display:flex;flex-direction:column;line-height:1.2}
.brand__name{font-size:18px;font-weight:800;letter-spacing:.03em}
.brand__tagline{font-size:12px;font-weight:600;letter-spacing:.12em;color:var(--c-muted)}

/* 导航索引 */
.site-nav{margin-left:auto;position:relative;z-index:1}
.nav-index{display:flex;align-items:center;gap:2px}
.nav-index__item{position:relative}
.nav-index__link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 11px;border-radius:var(--radius-s);
  font-size:15px;font-weight:600;
  transition:background .2s ease,color .2s ease;
}
.nav-index__num{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--c-mist);transition:color .2s ease;
}
.nav-index__link:hover{background:var(--c-paper)}
.nav-index__link:hover .nav-index__num{color:var(--c-terracotta)}
.nav-index__link[aria-current="page"]{color:var(--c-terracotta-deep)}
.nav-index__link[aria-current="page"] .nav-index__num{color:var(--c-terracotta-deep)}
.nav-index__link[aria-current="page"]::after{
  content:"";position:absolute;left:11px;right:11px;bottom:3px;height:2px;
  background:var(--c-orange);border-radius:2px;
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;border:var(--line-ink);border-radius:var(--radius-s);
  background:var(--c-paper);font-size:14px;font-weight:700;
}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:2px;background:var(--c-ink);border-radius:2px}

/* 页头行动点 */
.header-cta{
  margin-left:14px;white-space:nowrap;
  padding:10px 18px;border-radius:999px;
  background:var(--c-orange);color:var(--c-ink);
  border:1px solid var(--c-terracotta);
  font-size:14.5px;font-weight:800;letter-spacing:.03em;
  box-shadow:3px 3px 0 var(--c-terracotta);
  transition:transform .18s ease,box-shadow .18s ease;
}
.header-cta:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--c-terracotta)}
.header-cta:active{transform:translate(0,0);box-shadow:1px 1px 0 var(--c-terracotta)}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:96px;
  background:var(--c-deep);color:var(--c-cream);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:4px;
  background:linear-gradient(90deg,var(--c-orange) 0 120px,var(--c-terracotta) 120px 200px,var(--c-mist) 200px 100%);
}
.footer-inner{
  max-width:var(--shell);margin:0 auto;
  padding:64px var(--gutter) 40px;
  display:grid;grid-template-columns:1.1fr .9fr 1.3fr;gap:44px;
}
.footer-brand{font-size:26px;font-weight:900;letter-spacing:.04em;max-width:none}
.footer-tagline{margin-top:8px;font-size:13px;font-weight:600;letter-spacing:.14em;color:var(--c-mist);max-width:none}
.footer-note{
  margin-top:20px;font-size:14px;line-height:1.9;
  color:rgba(245,239,227,.76);max-width:30em;
}
.footer-nav__title{color:rgba(245,239,227,.6);margin-bottom:16px}
.footer-nav__list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px 20px}
.footer-nav__link{
  font-size:15px;font-weight:600;color:var(--c-cream);
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .2s ease,border-color .2s ease;
}
.footer-nav__link:hover{color:var(--c-amber);border-bottom-color:var(--c-amber)}
.footer-contact{display:grid;gap:16px;align-content:start}
.footer-contact__row{display:grid;grid-template-columns:76px minmax(0,1fr);gap:12px;align-items:start;max-width:none}
.footer-contact__key{
  font-size:12.5px;letter-spacing:.1em;font-weight:600;
  color:rgba(245,239,227,.58);padding-top:3px;
}
.footer-contact__val{font-size:14px;line-height:1.8;color:var(--c-cream);word-break:break-word}
.footer-base{
  max-width:var(--shell);margin:0 auto;
  padding:18px var(--gutter) 34px;
  border-top:1px solid rgba(245,239,227,.18);
  display:flex;flex-wrap:wrap;gap:10px 26px;
  font-size:12.5px;letter-spacing:.08em;color:rgba(245,239,227,.62);
}
.footer-base__item{max-width:none}

/* ---------- 7. 容器与网格 ---------- */
.wrap{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.wrap--wide{max-width:1320px}
.wrap--narrow{max-width:780px}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gutter)}

/* ---------- 8. 正文容器 ---------- */
.prose{max-width:42em;font-size:17px;line-height:1.9}
.prose h2{margin:2.2em 0 .7em}
.prose h3{margin:1.8em 0 .55em}
.prose p+p{margin-top:1.05em}
.prose ul{margin:1.2em 0;display:grid;gap:.7em}
.prose ul li{position:relative;padding-left:1.6em}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.76em;
  width:9px;height:2px;background:var(--c-orange);
}
.prose a{border-bottom:1px solid var(--c-mist);padding-bottom:1px}
.prose a:hover{border-bottom-color:var(--c-terracotta-deep);color:var(--c-terracotta-deep)}

/* ---------- 9. 章节标题带 ---------- */
.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 16px;
  border-bottom:var(--line);padding-bottom:14px;margin-bottom:32px;
}
.section-head__num{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.14em;color:var(--c-mist)}
.section-head__title{font-size:clamp(22px,2.2vw,30px);font-weight:900;letter-spacing:.01em}
.section-head__note{margin-left:auto;font-size:12.5px;letter-spacing:.1em;color:var(--c-muted)}

/* ---------- 10. 纸张卡片 ---------- */
.paper{
  background:var(--c-paper);border:var(--line);border-radius:var(--radius-m);
  padding:26px;box-shadow:var(--paper-shadow);
  transition:box-shadow .22s ease,transform .22s ease;
}
.paper:hover{transform:translate(-4px,-4px);box-shadow:12px 12px 0 rgba(138,167,156,.24)}
.paper--warm{box-shadow:var(--paper-shadow-warm)}
.paper--warm:hover{box-shadow:12px 12px 0 rgba(226,112,58,.22)}
.paper--deep{
  background:var(--c-deep);color:var(--c-cream);
  border-color:var(--c-deep);box-shadow:var(--paper-shadow-deep);
}
.paper--deep h3,.paper--deep h4{color:var(--c-cream)}

/* ---------- 11. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 24px;border-radius:999px;
  font-size:15px;font-weight:800;letter-spacing:.03em;
  background:var(--c-paper);color:var(--c-ink);
  border:1px solid var(--c-ink);
  box-shadow:4px 4px 0 rgba(34,28,21,.14);
  transition:transform .18s ease,box-shadow .18s ease,background .2s ease,color .2s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 rgba(34,28,21,.18)}
.btn:active{transform:translate(0,0);box-shadow:2px 2px 0 rgba(34,28,21,.18)}
.btn--solid{background:var(--c-ink);color:var(--c-cream);border-color:var(--c-ink);box-shadow:4px 4px 0 rgba(226,112,58,.55)}
.btn--solid:hover{box-shadow:6px 6px 0 rgba(226,112,58,.7)}
.btn--warm{background:var(--c-orange);color:var(--c-ink);border-color:var(--c-terracotta);box-shadow:4px 4px 0 var(--c-terracotta)}
.btn--ghost{background:transparent;border-color:var(--c-mist);box-shadow:none}
.btn--ghost:hover{background:var(--c-paper);box-shadow:4px 4px 0 rgba(138,167,156,.4)}
.btn-row{display:flex;flex-wrap:wrap;gap:14px;align-items:center}

/* ---------- 12. 筛选条 ---------- */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding:14px 0 22px;border-bottom:var(--line);margin-bottom:30px;
}
.filter-bar__label{font-size:12.5px;letter-spacing:.12em;color:var(--c-muted);margin-right:6px}
.filter-btn{
  padding:8px 16px;border-radius:999px;
  border:1px solid var(--c-silver);background:var(--c-paper);
  font-size:14px;font-weight:700;color:var(--c-ink);
  transition:background .18s ease,border-color .18s ease,color .18s ease,transform .18s ease;
}
.filter-btn:hover{border-color:var(--c-terracotta);color:var(--c-terracotta-deep);transform:translateY(-2px)}
.filter-btn[aria-pressed="true"]{background:var(--c-ink);border-color:var(--c-ink);color:var(--c-cream)}

/* ---------- 13. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:12.5px;letter-spacing:.1em;color:var(--c-muted);
  margin-bottom:26px;
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item:not(:last-child)::after{content:"/";color:var(--c-silver)}
.breadcrumb a{color:var(--c-muted);border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--c-terracotta-deep);border-bottom-color:currentColor}
.breadcrumb [aria-current="page"]{color:var(--c-ink);font-weight:700}

/* ---------- 14. 图片容器 ---------- */
.figure-frame{
  position:relative;background:var(--c-paper);
  border:var(--line);border-radius:var(--radius-s);
  padding:10px;box-shadow:var(--paper-shadow);
}
.figure-frame__media{
  position:relative;overflow:hidden;border-radius:4px;
  aspect-ratio:4/3;
  background:linear-gradient(165deg,#8AA79C 0%,#5E7B74 44%,#223F4D 100%);
}
.figure-frame__media img{width:100%;height:100%;object-fit:cover}
.figure-frame--wide .figure-frame__media{aspect-ratio:16/9}
.figure-frame--tall .figure-frame__media{aspect-ratio:3/4}
.figure-frame--square .figure-frame__media{aspect-ratio:1/1}
.figure-frame__caption{
  margin-top:10px;display:flex;gap:10px;align-items:baseline;
  font-size:12.5px;letter-spacing:.1em;color:var(--c-muted);
}
.figure-frame__caption .mono{color:var(--c-mist)}

/* ---------- 15. 旁注 ---------- */
.margin-note{
  position:relative;padding-left:18px;
  font-size:14px;line-height:1.85;color:var(--c-muted);
  border-left:2px solid var(--c-mist);
}
.margin-note--warm{border-left-color:var(--c-orange)}

/* ---------- 16. 进入视口 ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .32s ease,transform .32s ease;
}
html[data-js="on"] [data-reveal][data-revealed="true"]{opacity:1;transform:none}

/* ---------- 17. 桌面滚动后的竖排索引 ---------- */
@media (min-width:1241px){
  html[data-scrolled="true"] .header-bar{padding-top:8px;padding-bottom:8px}
  html[data-scrolled="true"] .brand__seal{width:34px;height:34px;font-size:17px;border-radius:10px}
  html[data-scrolled="true"] .brand__tagline{display:none}
  html[data-scrolled="true"] .header-cta{margin-left:auto}

  html[data-scrolled="true"] .site-nav{
    position:fixed;left:0;top:50%;transform:translateY(-50%);
    margin:0;padding:8px 0;width:var(--rail);
    background:var(--c-paper);
    border:1px solid var(--c-silver);border-left:0;
    border-radius:0 var(--radius-m) var(--radius-m) 0;
    box-shadow:4px 4px 0 rgba(34,63,77,.08);
    z-index:2;
  }
  html[data-scrolled="true"] .nav-index{flex-direction:column;gap:0;align-items:stretch}
  html[data-scrolled="true"] .nav-index__item{border-bottom:1px solid rgba(191,185,174,.55)}
  html[data-scrolled="true"] .nav-index__item:last-child{border-bottom:0}
  html[data-scrolled="true"] .nav-index__link{
    display:flex;flex-direction:column;align-items:center;gap:7px;
    padding:13px 0;border-radius:0;font-size:15px;
  }
  html[data-scrolled="true"] .nav-index__label{
    writing-mode:vertical-rl;font-size:13px;font-weight:700;letter-spacing:.16em;
  }
  html[data-scrolled="true"] .nav-index__num{font-size:12.5px;color:var(--c-muted)}
  html[data-scrolled="true"] .nav-index__link:hover{background:var(--c-cream)}
  html[data-scrolled="true"] .nav-index__link[aria-current="page"]{background:var(--c-cream)}
  html[data-scrolled="true"] .nav-index__link[aria-current="page"]::after{display:none}
  html[data-scrolled="true"] .nav-index__link[aria-current="page"] .nav-index__num{color:var(--c-terracotta-deep)}
}

/* ---------- 18. 断点 ---------- */
@media (max-width:1100px){
  .header-cta{display:none}
}
@media (max-width:1000px){
  .footer-inner{grid-template-columns:1fr;gap:36px;padding-top:52px}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
}
@media (max-width:900px){
  :root{--gutter:18px}
  .brand__tagline{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}
  .site-nav{
    position:fixed;top:0;right:0;bottom:0;left:auto;
    width:min(86vw,340px);margin:0;
    padding:84px 20px 32px;
    background:var(--c-paper);
    border-left:var(--line);
    box-shadow:-14px 0 0 rgba(34,63,77,.08);
    overflow-y:auto;
    transform:translateX(102%);
    transition:transform .3s cubic-bezier(.22,.65,.3,1);
    z-index:1;
  }
  .site-header[data-open="true"] .site-nav{transform:translateX(0)}
  .nav-index{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-index__item{border-bottom:1px solid var(--c-silver)}
  .nav-index__link{
    width:100%;padding:15px 6px;border-radius:0;
    font-size:17px;gap:12px;
  }
  .nav-index__link:hover{background:transparent}
  .nav-index__num{font-size:12px}
  .nav-index__link[aria-current="page"]{background:linear-gradient(90deg,rgba(226,112,58,.14),transparent)}
  .nav-index__link[aria-current="page"]::after{display:none}
  .nav-toggle{position:relative;z-index:2}
}
@media (max-width:620px){
  body{font-size:16.5px;line-height:1.85}
  .footer-nav__list{grid-template-columns:1fr}
  .footer-contact__row{grid-template-columns:1fr;gap:2px}
  .footer-contact__key{padding-top:0}
  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
  .paper{padding:20px;box-shadow:5px 5px 0 rgba(138,167,156,.24)}
  .paper:hover{transform:none;box-shadow:5px 5px 0 rgba(138,167,156,.24)}
  .figure-frame{box-shadow:5px 5px 0 rgba(138,167,156,.24)}
  .section-head__note{margin-left:0;width:100%}
}

/* ---------- 19. 降低动态效果 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html[data-js="on"] [data-reveal]{opacity:1!important;transform:none!important}
  .paper:hover,.btn:hover,.filter-btn:hover,.header-cta:hover{transform:none}
}