/* =========================================================
   PG-DF 档案室 · 全站共享样式 /assets/site.css
   ========================================================= */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,li,ol,ul{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}

/* ---------- 2. tokens ---------- */
:root{
  --teal:#5FD3A6;
  --ink:#0E2A24;
  --ice:#BFE6F2;
  --ice-soft:#E7F1EE;
  --frost:#F4F8F6;
  --amber:#D9A441;
  --graphite:#141A18;
  --hair:#DDE9E4;
  --deep-blue:#2E6F86;
  --moss:#4F6B60;
  --clay:#C2604A;
  --paper:#FFFFFF;

  --rail-w:16.5rem;
  --shell-max:90rem;
  --gutter:clamp(1.15rem,4vw,3.25rem);

  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","IBM Plex Mono","Roboto Mono",Menlo,Consolas,"Liberation Mono",monospace;

  --dur:180ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-hard:7px 7px 0 var(--graphite);
  --shadow-soft:6px 6px 0 var(--hair);
}

/* ---------- 3. base ---------- */
html{scroll-behavior:smooth}
body{
  display:flex;
  flex-direction:column;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  font-weight:400;
  color:var(--graphite);
  background-color:var(--frost);
  background-image:
    linear-gradient(to right,rgba(221,233,228,.55) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(221,233,228,.35) 1px,transparent 1px);
  background-size:100% 100%,100% 4.5rem;
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{
  font-weight:900;
  color:var(--ink);
  line-height:1.16;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(2.2rem,4vw,3.6rem)}
h2{font-size:clamp(1.4rem,2.1vw,1.8rem)}
h3{font-size:clamp(1.1rem,1.5vw,1.35rem)}
strong,b{font-weight:700;color:var(--ink)}
small{font-size:.82rem;color:var(--moss)}
a{color:inherit;text-decoration:none}
#main-content{flex:1 1 auto;scroll-margin-top:5.5rem;display:block}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:.74rem;
  letter-spacing:.1em;
  text-transform:uppercase;
}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px}
::selection{background:var(--teal);color:var(--ink)}

/* ---------- 4. skip link ---------- */
.skip-link{
  position:fixed;
  top:-140px;
  left:1rem;
  z-index:400;
  display:inline-block;
  padding:.7rem 1.2rem;
  font-weight:700;
  font-size:.9rem;
  color:var(--ink);
  background:var(--amber);
  border:2px solid var(--graphite);
  box-shadow:4px 4px 0 var(--graphite);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:1rem}

/* ---------- 5. buttons / links / tags ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.68rem 1.1rem;
  font-size:.9rem;
  font-weight:700;
  line-height:1.2;
  letter-spacing:.02em;
  color:var(--ink);
  background:var(--teal);
  border:2px solid var(--graphite);
  box-shadow:4px 4px 0 var(--graphite);
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),
             transform var(--dur) var(--ease);
}
.btn:hover{background:var(--ink);color:var(--frost);border-color:var(--ink);box-shadow:4px 4px 0 var(--amber)}
.btn:active{transform:translate(2px,2px);box-shadow:2px 2px 0 var(--amber)}
.btn--ghost{
  color:var(--ice);
  background:transparent;
  border-color:rgba(191,230,242,.5);
  box-shadow:none;
}
.btn--ghost:hover{background:var(--teal);color:var(--ink);border-color:var(--teal);box-shadow:none}
.btn--amber{background:var(--amber);color:var(--ink)}
.btn--amber:hover{background:var(--ink);color:var(--amber);border-color:var(--ink);box-shadow:4px 4px 0 var(--teal)}

.link{
  color:var(--deep-blue);
  background-image:linear-gradient(var(--deep-blue),var(--deep-blue));
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:100% 1px;
  transition:color var(--dur) var(--ease),background-size var(--dur) var(--ease),background-image var(--dur) var(--ease);
}
.link:hover{color:var(--graphite);background-image:linear-gradient(var(--graphite),var(--graphite));background-size:100% 2px}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.16rem .5rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink);
  background:var(--ice);
  border:1.5px solid var(--graphite);
}
.tag--amber{background:var(--amber)}
.tag--clay{background:var(--clay);color:var(--frost);border-color:var(--clay)}

/* ---------- 6. header / side rail ---------- */
.site-header{
  position:sticky;
  top:0;
  left:0;
  right:0;
  z-index:100;
  background:var(--ink);
  border-bottom:2px solid var(--graphite);
}
.rail{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:.7rem clamp(1rem,4vw,1.4rem);
  background:var(--ink);
  color:var(--ice);
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:.65rem;
  min-width:0;
  color:var(--frost);
}
.brand__mark{
  flex:none;
  display:grid;
  place-items:center;
  width:2.55rem;
  height:2.55rem;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:.95rem;
  letter-spacing:.04em;
  color:var(--ink);
  background:var(--teal);
  border:2px solid var(--graphite);
  box-shadow:3px 3px 0 var(--amber);
  transition:background var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.brand:hover .brand__mark{background:var(--amber);box-shadow:3px 3px 0 var(--teal)}
.brand__text{display:flex;flex-direction:column;min-width:0;line-height:1.2}
.brand__name{font-weight:900;font-size:1rem;letter-spacing:-.01em;color:var(--frost);white-space:nowrap}
.brand__desc{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--teal);
}
.rail__meta{display:none;color:rgba(191,230,242,.7);border-top:1px solid rgba(191,230,242,.18);padding-top:.85rem}

/* nav toggle */
.nav-toggle{
  position:relative;
  z-index:130;
  display:inline-flex;
  align-items:center;
  gap:.55rem;
  padding:.44rem .65rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--frost);
  background:transparent;
  border:2px solid rgba(191,230,242,.45);
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--teal);color:var(--teal)}
.nav-toggle__bars{position:relative;display:block;width:1.05rem;height:.7rem}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:2px;
  background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}
.nav-toggle[aria-expanded="true"]{border-color:var(--amber);color:var(--amber)}

/* mobile drawer */
.site-nav{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  z-index:120;
  width:100%;
  max-width:100%;
  padding:4.6rem 1.4rem 2rem;
  overflow-y:auto;
  background:var(--ink);
  border-top:4px solid var(--amber);
  border-right:2px solid var(--graphite);
  transform:translateX(-101%);
  visibility:hidden;
  transition:transform 200ms var(--ease),visibility 0s linear 200ms;
}
.site-nav[data-open]{
  transform:translateX(0);
  visibility:visible;
  transition:transform 200ms var(--ease),visibility 0s linear 0s;
}
.site-nav__list{display:flex;flex-direction:column;gap:.1rem}
.site-nav__item{margin:0}
.site-nav__link{
  display:flex;
  align-items:baseline;
  gap:.7rem;
  padding:.68rem .7rem;
  font-size:1rem;
  font-weight:500;
  color:var(--ice);
  border-left:3px solid transparent;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.site-nav__link:hover{background:rgba(191,230,242,.08);border-left-color:var(--amber);color:var(--frost)}
.site-nav__link[aria-current="page"]{
  background:var(--teal);
  color:var(--ink);
  border-left-color:var(--graphite);
  font-weight:700;
}
.site-nav__idx{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.12em;
  color:var(--teal);
}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--ink);opacity:.6}

.rail__foot{display:none;flex-direction:column;gap:.6rem;margin-top:auto;padding-top:1rem;border-top:1px solid rgba(191,230,242,.2)}
.rail__hours{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.1em;color:rgba(191,230,242,.75);line-height:1.6}

/* progress spine */
.rail__progress{display:none}
.rail__progress-bar{
  display:block;
  width:100%;
  height:100%;
  background:var(--amber);
  transform:scaleY(var(--pg-progress,0));
  transform-origin:top center;
}

/* ---------- 7. footer ---------- */
.site-footer{
  margin-top:auto;
  padding:clamp(2.4rem,5vw,4rem) var(--gutter) 1.4rem;
  color:var(--ice);
  background:var(--ink);
  border-top:4px solid var(--teal);
}
.footer__inner{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  display:grid;
  gap:clamp(1.6rem,3vw,2.6rem);
}
.footer__top{display:grid;gap:2rem}
.footer__identity{min-width:0}
.footer__mark{
  display:inline-block;
  margin-bottom:.7rem;
  padding:.15rem .5rem;
  font-size:.62rem;
  color:var(--ink);
  background:var(--teal);
  letter-spacing:.16em;
}
.footer__name{
  font-size:clamp(1.4rem,2.6vw,2rem);
  font-weight:900;
  letter-spacing:-.015em;
  color:var(--frost);
  line-height:1.15;
}
.footer__summary{
  margin-top:.7rem;
  max-width:30ch;
  font-size:.94rem;
  line-height:1.8;
  color:rgba(244,248,246,.72);
}
.footer__cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.6rem}
.footer__col{min-width:0}
.footer__title{
  margin-bottom:.75rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--teal);
}
.footer__list{display:grid;gap:.34rem}
.footer__link{
  display:inline-block;
  font-size:.94rem;
  color:var(--ice);
  background-image:linear-gradient(var(--amber),var(--amber));
  background-repeat:no-repeat;
  background-position:0 100%;
  background-size:0 2px;
  transition:background-size 200ms var(--ease),color var(--dur) var(--ease);
}
.footer__link:hover{color:var(--frost);background-size:100% 2px}
.footer__contact{min-width:0}
.footer__contact-item{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.4rem .55rem;
  padding-block:.18rem;
}
.footer__label{flex:none;min-width:2.7rem;font-size:.6rem;letter-spacing:.16em;color:var(--teal)}
.footer__value{font-size:.92rem;color:var(--frost);word-break:break-word}
.footer__value--address{max-width:24ch;line-height:1.6}
.copy-btn{
  flex:none;
  padding:.16rem .45rem;
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.12em;
  color:var(--ice);
  background:transparent;
  border:1.5px solid rgba(191,230,242,.4);
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.copy-btn:hover{border-color:var(--amber);color:var(--amber)}
.copy-btn.is-copied{background:var(--teal);color:var(--ink);border-color:var(--teal)}

.footer__legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.7rem 1.6rem;
  padding-top:1.1rem;
  border-top:1px solid rgba(191,230,242,.22);
  color:rgba(191,230,242,.75);
}
.footer__copy,.footer__updated{font-size:.66rem;letter-spacing:.1em;margin:0}
.footer__updated{color:rgba(191,230,242,.55)}
.footer__legal-links{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem}
.footer__legal-links .footer__link{font-size:.8rem}

/* ---------- 8. layout helpers ---------- */
.container{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(2.4rem,5vw,4.2rem)}
.section--tight{padding-block:clamp(1.4rem,3vw,2.2rem)}
.grid{display:grid;gap:clamp(1rem,2vw,1.75rem)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,20rem),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,15rem),1fr))}

/* ---------- 9. archive components ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.4rem;
  margin-bottom:1.4rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--moss);
}
.crumbs a{color:var(--deep-blue);border-bottom:1px solid transparent;transition:border-color var(--dur) var(--ease)}
.crumbs a:hover{border-bottom-color:var(--deep-blue)}
.crumbs__sep{color:var(--hair)}
.crumbs [aria-current="page"]{color:var(--ink);font-weight:700}

.doc-head{
  display:flex;
  flex-direction:column;
  gap:.55rem;
  margin-bottom:1.5rem;
  padding-top:.85rem;
  border-top:3px solid var(--graphite);
}
.doc-head__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem .8rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--moss);
}
.doc-head__num{
  display:inline-block;
  padding:.08rem .42rem;
  font-weight:700;
  color:var(--amber);
  background:var(--ink);
}
.doc-head__title{font-size:clamp(1.4rem,2.2vw,1.9rem);font-weight:900;color:var(--ink)}

.plate{
  padding:clamp(1rem,2vw,1.4rem);
  background:var(--paper);
  border:2px solid var(--graphite);
  box-shadow:var(--shadow-hard);
}
.plate--soft{box-shadow:var(--shadow-soft);border-color:var(--graphite)}
.plate--ice{background:var(--ice-soft)}

.matrix{
  font-size:.92rem;
  background:var(--paper);
  border:2px solid var(--graphite);
}
.matrix caption{
  padding-bottom:.55rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--moss);
  text-align:left;
}
.matrix th{
  padding:.6rem .7rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:600;
  letter-spacing:.12em;
  text-transform:uppercase;
  text-align:left;
  color:var(--ice);
  background:var(--ink);
  white-space:nowrap;
}
.matrix td{
  padding:.62rem .7rem;
  border-top:1px solid var(--hair);
  vertical-align:top;
  line-height:1.6;
}
.matrix tbody tr:nth-child(even){background:var(--ice-soft)}
.matrix td .mono{font-size:.72rem;letter-spacing:.06em}

.footnote{
  padding:.8rem 1rem;
  font-size:.86rem;
  line-height:1.7;
  color:var(--moss);
  background:var(--ice-soft);
  border-left:6px solid var(--teal);
}
.footnote--clay{border-left-color:var(--clay);background:#FBEDE9;color:#7A3628}

.prose p{margin-bottom:1.1rem;line-height:1.85;color:#22302C}
.prose p:last-child{margin-bottom:0}
.prose h2,.prose h3{margin-block:1.8rem .8rem}
.prose ul,.prose ol{display:grid;gap:.5rem;margin-bottom:1.1rem}
.prose ul li{position:relative;padding-left:1.4rem;line-height:1.8}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;
  top:.62em;
  width:.58rem;
  height:.58rem;
  background:var(--teal);
  border:1.5px solid var(--graphite);
}
.prose ol{counter-reset:pg}
.prose ol li{position:relative;padding-left:1.9rem;line-height:1.8}
.prose ol li::before{
  counter-increment:pg;
  content:counter(pg,decimal-leading-zero);
  position:absolute;
  left:0;
  top:.05em;
  font-family:var(--font-mono);
  font-size:.72rem;
  color:var(--deep-blue);
}

/* image containers (页面阶段放占位) */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16/10;
  background:var(--ink);
  border:2px solid var(--graphite);
  box-shadow:var(--shadow-hard);
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.04)}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(155deg,rgba(95,211,166,.2),rgba(46,111,134,.24));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame__tag{
  position:absolute;
  left:0;
  bottom:0;
  z-index:2;
  padding:.24rem .6rem;
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink);
  background:var(--amber);
  border-top:2px solid var(--graphite);
  border-right:2px solid var(--graphite);
}
.media-frame--empty{
  display:grid;
  place-items:center;
  background-image:repeating-linear-gradient(45deg,#124037 0 10px,#0E2A24 10px 20px);
}
.media-frame__label{
  position:relative;
  z-index:2;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ice);
}

/* ---------- 10. reveal ---------- */
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 220ms var(--ease),transform 220ms var(--ease);
}
.js-ready [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 11. desktop rail ---------- */
@media (min-width:1080px){
  body{padding-left:var(--rail-w)}
  .site-header{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    right:auto;
    width:var(--rail-w);
    border-bottom:0;
    border-right:2px solid var(--graphite);
  }
  .rail{
    display:flex;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:1.4rem;
    height:100%;
    padding:1.9rem 1.25rem 1.5rem;
    overflow-y:auto;
  }
  .brand{gap:.7rem}
  .rail__meta{display:block}
  .nav-toggle{display:none}
  .site-nav{
    position:static;
    width:auto;
    max-width:none;
    padding:0;
    overflow:visible;
    background:transparent;
    border:0;
    transform:none;
    visibility:visible;
    transition:none;
  }
  .site-nav__list{gap:.14rem}
  .site-nav__link{
    padding:.62rem .7rem;
    font-size:.95rem;
    border-left-width:3px;
  }
  .rail__foot{display:flex}
  .rail__progress{
    display:block;
    position:absolute;
    top:0;
    right:0;
    bottom:0;
    width:3px;
    background:rgba(244,248,246,.14);
  }
  #main-content{scroll-margin-top:0}
}

/* ---------- 12. footer responsive ---------- */
@media (min-width:760px){
  .footer__top{grid-template-columns:minmax(0,1fr) minmax(0,1.25fr);gap:2rem 2.6rem}
  .footer__contact{grid-column:1 / -1}
}
@media (min-width:1080px){
  .footer__top{
    grid-template-columns:minmax(0,1.05fr) minmax(0,1.3fr) minmax(0,.95fr);
    align-items:start;
  }
  .footer__contact{grid-column:auto}
}

/* ---------- 13. motion / contrast prefs ---------- */
@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;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
}
@media (prefers-contrast:more){
  .footer__summary,.footer__updated{color:#F4F8F6}
  .matrix td{border-top-color:#9FB8AF}
}