/* ============================================================
   大发主站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   口径：工程蓝 + 安全橙，档案纸底，等宽编号，大圆角面板
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0}
ul[class],ol[class],nav ul{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
main{display:block}

/* ---------- 2. Tokens ---------- */
:root{
  --paper:#F4F1EA;
  --cream:#E9E1D2;
  --graphite:#3A3D42;
  --ink:#1E1A17;
  --blue:#1F4E79;
  --blue-deep:#173D5F;
  --steel:#A8C4DC;
  --orange:#E2711D;
  --red:#C4451F;
  --green:#2F6B4F;
  --brass:#B08A3E;
  --rule:#D8D3C7;

  --font-display:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap:1320px;
  --gutter:clamp(1.1rem,4vw,3rem);
  --r-xl:32px;
  --r-lg:24px;
  --r-md:16px;
  --r-pill:999px;
  --header-h:6.75rem;

  --ease:cubic-bezier(.2,.6,.3,1);
}

/* ---------- 3. Base ---------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.is-nav-open{overflow:hidden}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ---------- 4. Typography ---------- */
.display{
  font-family:var(--font-display);
  font-weight:250;
  font-size:clamp(2.75rem,7vw,6rem);
  line-height:1.02;
  letter-spacing:-.02em;
}
.h-sec{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.25rem,2.2vw,2rem);
  line-height:1.2;
  letter-spacing:-.01em;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.75rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--graphite);
}
.lede{
  font-size:clamp(1rem,1.3vw,1.125rem);
  color:var(--graphite);
  max-width:52ch;
}
.prose{max-width:720px}
.prose p{color:var(--graphite)}
.prose p + p{margin-top:.85rem}
.prose h2{margin-top:2rem;margin-bottom:.5rem}
.prose ul{margin-top:.75rem;padding-left:1.1rem;list-style:disc;color:var(--graphite)}

/* ---------- 5. Layout ---------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.hero-pad{padding-top:clamp(7rem,13vw,10.5rem)}
.section{padding-block:clamp(3rem,7vw,6rem)}
.section--tight{padding-block:clamp(2rem,4vw,3.5rem)}
.sec-head{
  display:flex;
  flex-wrap:wrap;
  gap:.6rem 1.5rem;
  align-items:baseline;
  justify-content:space-between;
  margin-bottom:clamp(1rem,2vw,1.75rem);
}
.split{display:grid;gap:clamp(1.5rem,3vw,3rem);align-items:start}
.grid{display:grid;gap:clamp(1rem,2vw,1.75rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.stack{display:grid;gap:.75rem}
.cluster{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.sep{height:1px;background:var(--rule);border:0;margin-block:clamp(1.5rem,3vw,2.5rem)}
.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;
}
@media (min-width:900px){
  .split{grid-template-columns:minmax(0,38fr) minmax(0,62fr)}
  .split--flip{grid-template-columns:minmax(0,62fr) minmax(0,38fr)}
}

/* ---------- 6. Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.68rem 1.15rem;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:.875rem;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn--solid{background:var(--blue);border-color:var(--blue);color:var(--paper)}
.btn--solid:hover{background:var(--blue-deep);border-color:var(--blue-deep)}
.btn--ghost{background:transparent;border-color:rgba(30,26,23,.24);color:var(--ink)}
.btn--ghost:hover{background:var(--cream);border-color:var(--ink)}
.btn--orange{background:var(--orange);border-color:var(--orange);color:#fff}
.btn--orange:hover{background:var(--red);border-color:var(--red)}
.btn--sm{padding:.42rem .8rem;font-size:.75rem}
.btn:active{transform:translateY(1px)}

/* ---------- 7. Tags & states ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.25rem .6rem;
  border-radius:var(--r-pill);
  border:1px solid var(--rule);
  background:var(--paper);
  color:var(--graphite);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.06em;
  line-height:1.6;
}
.tag--orange{background:var(--orange);border-color:var(--orange);color:#fff}
.tag--blue{background:var(--blue);border-color:var(--blue);color:#fff}
.tag--steel{background:var(--steel);border-color:var(--steel);color:var(--ink)}
.tag--green{background:transparent;border-color:var(--green);color:var(--green)}
.tag--brass{background:transparent;border-color:var(--brass);color:#7d6127}
.tag--red{background:transparent;border-color:var(--red);color:var(--red)}
.state{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
}
.state::before{content:"";width:.5rem;height:.5rem;border-radius:50%;background:currentColor}
.state--ok{color:var(--green)}
.state--due{color:var(--red)}
.state--active{color:var(--orange)}

/* ---------- 8. Panels, notes, breadcrumb ---------- */
.panel{
  background:var(--cream);
  border:1px solid var(--rule);
  border-radius:var(--r-xl);
  padding:clamp(1.25rem,2.5vw,2rem);
}
.panel--cream{background:var(--cream)}
.panel--ink{background:var(--ink);border-color:transparent;color:var(--cream)}
.panel--outline{background:transparent}
.note{border-left:2px solid var(--brass);padding-left:.85rem}
.note__label{
  display:block;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.14em;
  color:var(--graphite);
}
.note__body{font-size:.875rem;line-height:1.7;color:var(--graphite)}
.breadcrumb{padding-block:.75rem}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:.4rem;
  align-items:center;
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.1em;
  color:var(--graphite);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.4rem}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--rule)}
.breadcrumb__link{text-decoration:none;border-bottom:1px solid var(--rule);padding-bottom:1px}
.breadcrumb__link:hover{color:var(--blue);border-color:var(--blue)}
.breadcrumb__item[aria-current="page"]{color:var(--ink)}

/* ---------- 9. Media ---------- */
.media{
  position:relative;
  border:1px solid var(--rule);
  border-radius:var(--r-lg);
  overflow:hidden;
  background:var(--cream);
}
.media__frame{position:relative;aspect-ratio:4/3;overflow:hidden;background:var(--cream)}
.media--wide .media__frame{aspect-ratio:16/9}
.media--tall .media__frame{aspect-ratio:3/4}
.media__img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.94) contrast(1.04);
}
.media__badge{
  position:absolute;
  top:.75rem;
  left:.75rem;
  z-index:2;
}
.media__caption{
  padding:.6rem .85rem;
  border-top:1px solid var(--rule);
  background:var(--paper);
  font-family:var(--font-mono);
  font-size:.6875rem;
  letter-spacing:.08em;
  color:var(--graphite);
}

/* ---------- 10. Band / hscroll / index ---------- */
.band{
  background:var(--cream);
  border:1px solid var(--rule);
  border-radius:var(--r-xl);
  padding-block:clamp(.9rem,2vw,1.4rem);
}
.band__head{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem 1rem;
  align-items:baseline;
  justify-content:space-between;
  padding-inline:clamp(1rem,2.5vw,2rem);
}
.band__track{
  display:flex;
  gap:1rem;
  padding:.9rem clamp(1rem,2.5vw,2rem) .4rem;
  scroll-snap-type:x proximity;
  scrollbar-width:thin;
}
.band__item{flex:0 0 clamp(220px,26vw,300px);scroll-snap-align:start}
[data-hscroll]{overflow-x:auto;cursor:grab}
[data-hscroll].is-dragging{cursor:grabbing;scroll-snap-type:none;user-select:none}
.index-list{display:grid;gap:0}
.index-list__item{
  display:flex;
  gap:.75rem;
  align-items:baseline;
  padding:.6rem 0;
  border-bottom:1px solid var(--rule);
}
.index-list__num{font-family:var(--font-mono);font-size:.75rem;color:var(--orange)}
.index-list__label{
  font-family:var(--font-display);
  font-weight:700;
  font-size:.9375rem;
  text-decoration:none;
}
.index-list__label:hover{color:var(--blue)}
.index-list__label.is-active{color:var(--orange)}

/* ---------- 11. Filter ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center}
.filter-btn{
  padding:.4rem .85rem;
  border-radius:var(--r-pill);
  border:1px solid rgba(30,26,23,.2);
  background:transparent;
  color:var(--graphite);
  font-size:.75rem;
  font-weight:700;
  letter-spacing:.04em;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease);
}
.filter-btn:hover{border-color:var(--ink);color:var(--ink)}
.filter-btn[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:var(--paper)}
.filter-count{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.08em;color:var(--graphite)}
.is-filtered-out{display:none!important}
[data-copy]{cursor:copy;border-radius:6px}
.is-copied{color:var(--green)}

/* ---------- 12. Header ---------- */
.skip-link{
  position:absolute;
  left:1rem;
  top:-6rem;
  z-index:120;
  padding:.65rem 1.1rem;
  border-radius:var(--r-pill);
  background:var(--ink);
  color:var(--cream);
  font-size:.8125rem;
  font-weight:700;
  text-decoration:none;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:.75rem}

.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:80;
  color:var(--ink);
  background:transparent;
  transition:background-color .24s var(--ease),box-shadow .24s var(--ease);
}
.site-header.is-solid{
  background:rgba(244,241,234,.95);
  box-shadow:0 1px 0 var(--rule),0 18px 40px -34px rgba(30,26,23,.9);
}
.site-header[data-open]{background:var(--paper)}

.header-rail{
  position:relative;
  z-index:2;
  max-height:3rem;
  overflow:hidden;
  border-bottom:1px solid rgba(30,26,23,.12);
  transition:max-height .24s var(--ease),opacity .18s var(--ease),border-color .24s var(--ease);
}
.site-header.is-solid .header-rail,
.site-header[data-open] .header-rail{max-height:0;opacity:0;border-color:transparent}
.header-rail__inner{
  display:flex;
  flex-wrap:wrap;
  gap:.35rem 1.25rem;
  align-items:center;
  justify-content:space-between;
  padding-block:.45rem;
}
.header-rail__note,.header-rail__meta{
  font-size:.6875rem;
  letter-spacing:.1em;
  color:var(--graphite);
  line-height:1.6;
}

.header-main{position:relative;z-index:2}
.header-main__inner{
  display:flex;
  align-items:center;
  gap:clamp(.6rem,2vw,1.75rem);
  padding-block:.8rem;
  transition:padding-block .24s var(--ease);
}
.site-header.is-solid .header-main__inner{padding-block:.55rem}

.brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;flex:0 0 auto}
.brand__mark{
  width:2.5rem;
  height:2.5rem;
  flex:0 0 auto;
  display:grid;
  place-items:center;
  border-radius:var(--r-md);
  background:var(--ink);
  color:var(--cream);
  border:1px solid var(--ink);
  font-family:var(--font-mono);
  font-size:.8125rem;
  letter-spacing:.06em;
}
.brand__text{display:grid;line-height:1.25}
.brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:1.0625rem;
  letter-spacing:.02em;
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.12em;
  color:var(--graphite);
}

.site-nav{flex:1 1 auto;display:flex;justify-content:center}
.site-nav__list{display:flex;align-items:center;gap:.15rem}
.site-nav__item{list-style:none}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:.42rem;
  padding:.55rem .8rem;
  border-radius:var(--r-pill);
  color:var(--graphite);
  font-size:.875rem;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  transition:background-color .16s var(--ease),color .16s var(--ease);
}
.site-nav__link:hover{background:var(--cream);color:var(--ink)}
.site-nav__link[aria-current="page"]{background:var(--blue);color:var(--paper)}
.site-nav__index{font-family:var(--font-mono);font-size:.625rem;letter-spacing:.08em;opacity:.6}
.site-nav__actions{display:none}

.header-actions{display:flex;gap:.5rem;flex:0 0 auto}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.55rem .85rem;
  border-radius:var(--r-pill);
  border:1px solid rgba(30,26,23,.24);
  background:transparent;
  color:var(--ink);
}
.nav-toggle__label{font-size:.75rem;font-weight:700;letter-spacing:.08em}
.nav-toggle__bars{position:relative;display:block;width:1.15rem;height:2px;background:var(--ink);transition:background-color .16s var(--ease)}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:2px;
  background:var(--ink);
  transition:transform .18s var(--ease),top .18s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open] .nav-toggle__bars{background:transparent}
.site-header[data-open] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

.header-progress{height:2px;background:transparent}
.header-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--blue) 0%,var(--steel) 55%,var(--orange) 100%);
}

@media (min-width:1120px){
  :root{--header-h:7.75rem}
}

/* 移动导航面板 */
@media (max-width:1119px){
  .header-actions{display:none}
  .nav-toggle{display:inline-flex}
  .header-main__inner{justify-content:space-between}
  .site-nav{
    position:fixed;
    inset:0;
    z-index:1;
    flex-direction:column;
    justify-content:flex-start;
    gap:1rem;
    padding:calc(var(--header-h) + 1rem) var(--gutter) 2.5rem;
    background:var(--paper);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .18s var(--ease),transform .18s var(--ease),visibility .18s linear;
  }
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__item{border-bottom:1px solid var(--rule)}
  .site-nav__link{
    width:100%;
    border-radius:var(--r-md);
    padding:.95rem .75rem;
    font-family:var(--font-display);
    font-size:1.375rem;
    font-weight:900;
    letter-spacing:.01em;
    color:var(--ink);
  }
  .site-nav__link:hover{background:var(--cream)}
  .site-nav__link[aria-current="page"]{background:var(--cream);color:var(--blue)}
  .site-nav__index{font-size:.75rem}
  .site-nav__actions{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:.5rem}
  .site-nav__actions .btn{flex:1 1 10rem}
}

/* ---------- 13. Footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,7vw,6rem);
  padding-block:clamp(2.5rem,5vw,4rem) clamp(1.5rem,3vw,2rem);
  background:var(--ink);
  color:var(--cream);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:14px;
  background-image:repeating-linear-gradient(90deg,rgba(176,138,62,.55) 0 1px,transparent 1px 12px);
  opacity:.75;
  pointer-events:none;
}
.footer__inner{
  display:grid;
  gap:clamp(1.75rem,4vw,3rem);
  grid-template-columns:1fr;
  padding-top:clamp(.5rem,2vw,1rem);
}
@media (min-width:760px){
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1080px){
  .footer__inner{grid-template-columns:1.35fr .75fr .75fr 1.15fr}
}
.footer-brand__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:1.5rem;
  letter-spacing:.02em;
  color:var(--paper);
}
.footer-brand__line{
  margin-top:.35rem;
  font-size:.6875rem;
  letter-spacing:.14em;
  color:var(--brass);
}
.footer-brand__note{
  margin-top:.85rem;
  max-width:34ch;
  font-size:.8125rem;
  line-height:1.7;
  color:rgba(233,225,210,.72);
}
.footer-col__title{
  margin-bottom:.9rem;
  font-family:var(--font-display);
  font-weight:900;
  font-size:.9375rem;
  letter-spacing:.06em;
  color:var(--paper);
}
.footer-col__list{display:grid;gap:.55rem}
.footer-col__link{
  display:inline-block;
  font-size:.875rem;
  color:var(--cream);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-col__link:hover{color:var(--orange);border-color:var(--orange)}
.footer-contact__lead{
  display:inline-block;
  margin-bottom:.9rem;
  font-size:.875rem;
  font-weight:700;
  color:var(--orange);
  text-decoration:none;
  border-bottom:1px solid rgba(226,113,29,.45);
}
.footer-contact__lead:hover{color:var(--paper);border-color:var(--paper)}
.footer-contact__list{display:grid;gap:.55rem}
.footer-contact__row{
  display:grid;
  grid-template-columns:3.25rem minmax(0,1fr);
  gap:.5rem;
  align-items:baseline;
}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:.625rem;
  letter-spacing:.12em;
  color:var(--steel);
}
.footer-contact__value{
  margin:0;
  font-size:.875rem;
  line-height:1.65;
  color:var(--cream);
  overflow-wrap:anywhere;
}
.footer-contact__note{
  margin-top:.9rem;
  max-width:46ch;
  font-size:.75rem;
  line-height:1.7;
  color:rgba(233,225,210,.7);
}
.footer-bottom{
  margin-top:clamp(2rem,4vw,3rem);
  padding-top:1.25rem;
  border-top:1px solid rgba(233,225,210,.18);
  display:flex;
  flex-wrap:wrap;
  gap:.75rem 1.5rem;
  align-items:center;
  justify-content:space-between;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:.5rem 1rem}
.footer-legal__link{
  font-size:.75rem;
  color:rgba(233,225,210,.8);
  text-decoration:none;
  border-bottom:1px solid rgba(233,225,210,.3);
}
.footer-legal__link:hover{color:var(--orange);border-color:var(--orange)}
.footer-icp,.footer-copy{
  font-size:.75rem;
  letter-spacing:.08em;
  color:rgba(233,225,210,.72);
}

/* ---------- 14. Reveal & motion ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .38s var(--ease),transform .38s var(--ease);
}
.js [data-reveal].is-visible{opacity:1;transform:none}

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