/* ============================================================
   mj77.cn — Base layer
   Design tokens · reset · shared nav / footer / compliance bar
   ============================================================ */
:root{
  --paper:#F7F5F0;
  --paper-2:#F1EEE7;
  --ink:#1A1815;
  --ink-2:#6B655C;
  --ink-3:#9C958A;
  --rule:#E2DCD1;
  --accent:#B5462B;
  --accent-soft:#EFE0D8;
  --inverse-bg:#161411;
  --inverse-ink:#F4F0E9;

  --font-display:Georgia,"Times New Roman","Songti SC","STSong",serif;
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;

  --t-xxl:clamp(2.4rem,6.2vw,5rem);
  --t-xl:clamp(1.75rem,3.4vw,2.75rem);
  --t-lg:clamp(1.15rem,1.9vw,1.5rem);
  --t-md:clamp(1rem,1.15vw,1.0625rem);
  --t-sm:0.9375rem;
  --t-xs:0.75rem;

  --gutter:clamp(1.25rem,5vw,5.5rem);
  --section:clamp(5rem,12vh,9.5rem);
  --measure:70ch;

  --ease:cubic-bezier(.22,1,.36,1);
  --ease-io:cubic-bezier(.65,0,.35,1);
}
[data-theme="dark"]{
  --paper:#141210;
  --paper-2:#1C1916;
  --ink:#F2EDE5;
  --ink-2:#A29A8E;
  --ink-3:#7A7268;
  --rule:#2E2822;
  --accent:#E4835E;
  --accent-soft:#3A2620;
  --inverse-bg:#F4F0E9;
  --inverse-ink:#161411;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--font-sans);font-size:var(--t-md);line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
  transition:background .5s var(--ease),color .5s var(--ease);
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.032;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
}
::selection{background:var(--accent);color:#fff}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:4px;border-radius:2px}
img,svg{max-width:100%;height:auto}

/* skip link — 键盘可达性 */
.skip{
  position:absolute;left:-9999px;top:0;z-index:200;background:var(--ink);color:var(--paper);
  padding:.7rem 1.2rem;font-size:var(--t-sm);border-radius:0 0 4px 0;
}
.skip:focus{left:0}

.shell{position:relative;z-index:1;max-width:1440px;margin:0 auto;padding-inline:var(--gutter)}

/* ---------- nav ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:color-mix(in srgb,var(--paper) 88%,transparent);
  border-bottom:1px solid transparent;
  transition:border-color .4s var(--ease),background .4s var(--ease);
}
.nav[data-stuck="true"]{border-bottom-color:var(--rule);backdrop-filter:saturate(140%) blur(8px)}
.nav-in{max-width:1440px;margin:0 auto;padding:1.15rem var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{font-family:var(--font-display);font-size:1.35rem;font-style:italic;letter-spacing:-.01em;display:flex;align-items:center;gap:.55rem}
.brand .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);display:inline-block;transform:translateY(-1px)}
.nav-links{display:flex;align-items:center;gap:clamp(.7rem,2.4vw,2.4rem)}
.nav-links a{
  font-size:var(--t-xs);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-2);
  position:relative;padding-block:.35rem;transition:color .3s var(--ease);white-space:nowrap;
}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;background:var(--ink);
  transform:scaleX(0);transform-origin:right;transition:transform .45s var(--ease);
}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--ink)}
.nav-links a:hover::after,.nav-links a[aria-current="page"]::after{transform:scaleX(1);transform-origin:left}
.theme-btn{
  width:34px;height:34px;border:1px solid var(--rule);border-radius:50%;background:transparent;color:var(--ink-2);
  cursor:pointer;display:grid;place-items:center;transition:all .35s var(--ease);flex:none;
}
.theme-btn:hover{border-color:var(--ink);color:var(--ink);transform:rotate(-25deg)}
.theme-btn svg{width:15px;height:15px}
[data-theme="dark"] .icon-sun{display:none}
[data-theme="light"] .icon-moon{display:none}

/* ---------- section head ---------- */
.sec-head{
  display:flex;align-items:baseline;gap:1rem;margin-bottom:clamp(2.5rem,6vh,4.5rem);
  border-top:1px solid var(--rule);padding-top:1.25rem;
}
.sec-num{font-family:var(--font-display);font-size:var(--t-sm);color:var(--accent);font-style:italic}
.sec-title{font-size:var(--t-xs);letter-spacing:.22em;text-transform:uppercase;color:var(--ink-2)}
.sec-title em{font-style:normal;color:var(--ink-3);margin-left:.5rem;letter-spacing:.05em;text-transform:none}

/* ============================================================
   Compliance footer — 备案标识区（公安备案核心展示位）
   ============================================================ */
.foot{border-top:1px solid var(--rule);margin-top:var(--section);padding-block:clamp(2.5rem,6vh,4rem);position:relative;z-index:1}
.foot-grid{display:grid;grid-template-columns:1fr;gap:2rem clamp(2rem,5vw,4rem)}
@media(min-width:820px){.foot-grid{grid-template-columns:1.1fr 1fr 1fr}}
.foot h4{
  font-size:var(--t-xs);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-3);
  font-weight:500;margin-bottom:1rem;
}
.foot-sub{font-family:var(--font-display);font-size:1.15rem;letter-spacing:-.01em;margin-bottom:.5rem}
.foot p,.foot li{font-size:var(--t-sm);color:var(--ink-2);line-height:1.9}
.foot ul{list-style:none}
.foot a{color:var(--ink-2);transition:color .3s var(--ease);border-bottom:1px solid transparent}
.foot a:hover{color:var(--accent);border-bottom-color:var(--accent)}

/* 公示信息键值对 */
.kv{display:grid;grid-template-columns:auto 1fr;gap:.35rem 1rem;font-size:var(--t-sm)}
.kv dt{color:var(--ink-3);white-space:nowrap}
.kv dd{color:var(--ink-2)}

/* 备案条 */
.beian-bar{
  margin-top:clamp(2rem,5vh,3rem);padding-top:1.5rem;border-top:1px solid var(--rule);
  display:flex;flex-wrap:wrap;align-items:center;gap:.6rem clamp(1rem,3vw,2rem);
  font-size:var(--t-xs);color:var(--ink-3);
}
.beian-item{display:inline-flex;align-items:center;gap:.5rem}
.beian-item img,.beian-item svg{width:18px;height:20px;flex:none;display:block}
.beian-shield{color:var(--ink-3)}
.beian-item a{color:var(--ink-3);border-bottom:1px solid transparent}
.beian-item a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.beian-pending{
  display:inline-flex;align-items:center;gap:.4rem;padding:.15rem .55rem;border:1px dashed var(--rule);
  border-radius:999px;color:var(--ink-3);
}
.beian-pending::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent);flex:none}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .85s var(--ease),transform .85s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- scroll progress ---------- */
.progress{position:fixed;top:0;left:0;height:2px;width:0;background:var(--accent);z-index:99;transition:width .1s linear}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}
@media print{
  .nav,.progress,.theme-btn{display:none!important}
  body{background:#fff;color:#000}
  body::before{display:none}
}