/* ============================================================
   /assets/site.css — 共享外壳：轨道头部、地标页脚、通用组件
   ============================================================ */

:root{
  --ink:#081826;
  --ink-deep:#030A10;
  --ink-panel:#0F2740;
  --steel:#5C7387;
  --mist:#93A7B6;
  --paper:#F3EEE4;
  --paper-pure:#FCFAF5;
  --gold:#C9A24B;
  --gold-hi:#E4C77E;
  --amber:#E8873A;

  --rail-w:236px;
  --cut:18px;

  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:190ms;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5.2rem;}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.72;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(880px 620px at 86% -12%, rgba(201,162,75,.15), transparent 62%),
    radial-gradient(720px 560px at 6% 108%, rgba(232,135,58,.10), transparent 64%);
}
main{display:block;position:relative;z-index:1;}
img,svg{max-width:100%;display:block;}
h1,h2,h3,h4,p,ul,ol,dl,dd,figure{margin:0;padding:0;}
ul,ol{list-style:none;}
a{color:inherit;}
button{font:inherit;}
::selection{background:rgba(201,162,75,.35);color:var(--paper-pure);}

:focus-visible{
  outline:2px solid var(--gold-hi);
  outline-offset:2px;
}
#main-content:focus-visible{outline-offset:6px;}

/* ---------- 排版 ---------- */
h1,h2,h3,h4{
  font-weight:800;
  letter-spacing:-.025em;
  line-height:1.22;
  text-wrap:balance;
}
p{text-wrap:pretty;}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--gold);
}
.eyebrow::before{
  content:"";
  width:16px;
  height:1px;
  background:linear-gradient(90deg,var(--gold),transparent);
}
.coord{
  font-family:var(--mono);
  font-size:.74rem;
  letter-spacing:.1em;
  color:var(--steel);
}
.text-link{
  color:var(--gold-hi);
  text-decoration:none;
  background-image:linear-gradient(var(--gold-hi),var(--gold-hi));
  background-repeat:no-repeat;
  background-size:0 1px;
  background-position:0 100%;
  transition:background-size var(--dur) var(--ease),color var(--dur) var(--ease);
}
.text-link:hover{background-size:100% 1px;color:var(--paper-pure);}

/* ---------- 布局容器 ---------- */
.container{
  width:100%;
  max-width:1180px;
  margin-inline:auto;
  padding-inline:clamp(1.1rem,5vw,3.2rem);
}
.section{
  padding-block:clamp(2.4rem,6vw,4.6rem);
  position:relative;
  z-index:1;
}
.rule{
  height:1px;
  border:0;
  margin-block:clamp(1.4rem,3vw,2.2rem);
  background:linear-gradient(90deg,rgba(201,162,75,.6),rgba(92,115,135,.28) 42%,transparent);
}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;
  top:-120px;
  left:.75rem;
  z-index:140;
  padding:.62rem 1rem;
  background:var(--gold-hi);
  color:#0A1A28;
  font-size:.82rem;
  font-weight:800;
  letter-spacing:.04em;
  text-decoration:none;
  border-radius:2px;
  box-shadow:0 12px 26px -14px rgba(0,0,0,.9);
  transition:top 160ms var(--ease);
}
.skip-link:focus{top:.75rem;}

/* ============================================================
   头部：侧边轨道
   ============================================================ */
.site-rail{
  position:sticky;
  top:0;
  z-index:90;
  width:100%;
  display:flex;
  flex-direction:column;
  padding:.6rem clamp(1rem,4vw,2rem) .55rem;
  background:linear-gradient(180deg,#0B1F31 0%,#081826 62%,#061320 100%);
  border-bottom:1px solid rgba(92,115,135,.32);
  box-shadow:0 10px 30px -22px rgba(0,0,0,.95);
}
.rail-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:2px;
  z-index:95;
  pointer-events:none;
  background:rgba(92,115,135,.18);
}
.rail-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--gold),var(--amber));
  box-shadow:0 0 12px rgba(228,199,126,.55);
  transition:width 120ms linear;
}

.rail-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:.8rem;
}
.rail-brand{
  display:flex;
  align-items:center;
  gap:.7rem;
  min-width:0;
  text-decoration:none;
  color:var(--paper);
}
.rail-brand__mark{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:2.5rem;
  height:2.5rem;
  font-family:var(--mono);
  font-size:.92rem;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--gold-hi);
  background:linear-gradient(150deg,rgba(201,162,75,.26),rgba(201,162,75,.03));
  border:1px solid rgba(201,162,75,.6);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%);
}
.rail-brand__text{display:block;min-width:0;}
.rail-brand__name{
  display:block;
  font-size:1.02rem;
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.25;
  color:var(--paper-pure);
}
.rail-brand__sub{
  display:block;
  font-family:var(--mono);
  font-size:.62rem;
  letter-spacing:.17em;
  text-transform:uppercase;
  color:var(--steel);
}

.rail-toggle{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  flex:0 0 auto;
  padding:.5rem .72rem;
  background:rgba(15,39,64,.85);
  color:var(--paper);
  border:1px solid rgba(92,115,135,.45);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  cursor:pointer;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.rail-toggle:hover{color:var(--gold-hi);border-color:var(--gold);background:rgba(201,162,75,.12);}
.rail-toggle__bars{display:grid;gap:3px;width:16px;}
.rail-toggle__bars i{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.rail-toggle__label{
  font-size:.76rem;
  font-weight:700;
  letter-spacing:.12em;
}
.site-rail[data-open="true"] .rail-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg);}
.site-rail[data-open="true"] .rail-toggle__bars i:nth-child(2){opacity:0;}
.site-rail[data-open="true"] .rail-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

.rail-scale{
  position:relative;
  height:10px;
  margin:.7rem 0 .2rem;
  background-image:repeating-linear-gradient(to right,rgba(147,167,182,.45) 0 1px,transparent 1px 16px);
}
.rail-scale::after{
  content:"";
  position:absolute;
  top:-3px;
  left:calc(var(--rail-pos,0) * (100% - 2px));
  width:2px;
  height:16px;
  background:var(--gold-hi);
  box-shadow:0 0 9px rgba(228,199,126,.85);
  transition:left 220ms var(--ease);
}

.rail-nav{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows 240ms var(--ease);
}
.site-rail[data-open="true"] .rail-nav{grid-template-rows:1fr;}
.rail-nav__inner{overflow:hidden;min-height:0;}
.rail-nav__legend{
  padding-top:.85rem;
  border-top:1px solid rgba(92,115,135,.28);
  font-family:var(--mono);
  font-size:.65rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--steel);
}
.rail-nav__list{display:flex;flex-direction:column;gap:1px;padding-block:.45rem;}
.rail-link{
  display:grid;
  grid-template-columns:2.3rem 1fr;
  align-items:center;
  gap:.55rem;
  padding:.55rem .7rem;
  color:var(--mist);
  text-decoration:none;
  border-left:2px solid transparent;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.rail-link:hover{
  color:var(--paper-pure);
  background:rgba(201,162,75,.1);
  border-left-color:var(--gold-hi);
  transform:translateX(2px);
}
.rail-link__coord{
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.08em;
  color:var(--steel);
  transition:color var(--dur) var(--ease);
}
.rail-link__label{font-size:.94rem;font-weight:700;letter-spacing:-.01em;}
.rail-link[aria-current="page"]{
  color:var(--gold-hi);
  background:linear-gradient(90deg,rgba(201,162,75,.2),rgba(201,162,75,0) 88%);
  border-left-color:var(--gold);
}
.rail-link[aria-current="page"] .rail-link__coord{color:var(--gold);}

.rail-foot{
  padding-block:.9rem .4rem;
  border-top:1px solid rgba(92,115,135,.28);
}
.rail-foot__coord{
  font-family:var(--mono);
  font-size:.64rem;
  letter-spacing:.1em;
  color:var(--steel);
  margin-bottom:.6rem;
}
.rail-cta{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  padding:.6rem .8rem;
  font-size:.82rem;
  font-weight:800;
  letter-spacing:.06em;
  color:#0A1A28;
  text-decoration:none;
  background:linear-gradient(135deg,var(--gold-hi),var(--gold));
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:filter var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.rail-cta:hover{filter:brightness(1.08);transform:translateY(-1px);}

/* ---- 桌面：固定侧边轨道 ---- */
@media (min-width:1024px){
  body{padding-inline-start:var(--rail-w);}
  .rail-progress{
    left:var(--rail-w);
    width:calc(100% - var(--rail-w));
  }
  .site-rail{
    position:fixed;
    inset-block:0;
    inset-inline-start:0;
    width:var(--rail-w);
    height:100vh;
    padding:1.5rem 0 1rem;
    border-bottom:0;
    border-inline-end:1px solid rgba(92,115,135,.28);
    overflow-y:auto;
    overscroll-behavior:contain;
  }
  .rail-toggle{display:none;}
  .rail-top{padding-inline:1.15rem;}
  .rail-scale{margin:1.05rem 1.15rem .85rem;}
  .rail-nav{
    grid-template-rows:1fr;
    display:flex;
    flex:1 1 auto;
    min-height:0;
  }
  .rail-nav__inner{
    overflow:visible;
    display:flex;
    flex-direction:column;
    width:100%;
    padding-inline:.55rem;
  }
  .rail-nav__legend{
    border-top:0;
    padding:.4rem .7rem .1rem;
  }
  .rail-foot{
    margin-top:auto;
    padding:.9rem .7rem .2rem;
  }
}

/* ============================================================
   页脚：地标基座
   ============================================================ */
.site-foot{
  position:relative;
  z-index:1;
  margin-top:clamp(2rem,6vw,4.5rem);
  padding:clamp(2.2rem,5vw,3.6rem) clamp(1.1rem,5vw,3.2rem) 0;
  background:linear-gradient(180deg,#0A1D2E 0%,#061320 48%,var(--ink-deep) 100%);
  border-top:1px solid rgba(201,162,75,.32);
  color:var(--mist);
}
.site-foot::before{
  content:"";
  position:absolute;
  inset-inline:0;
  top:0;
  height:8px;
  background-image:repeating-linear-gradient(to right,rgba(201,162,75,.5) 0 1px,transparent 1px 30px);
  opacity:.55;
  pointer-events:none;
}
.foot-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(1.7rem,3.6vw,2.8rem);
  max-width:1240px;
  margin-inline:auto;
  padding-bottom:clamp(1.8rem,4vw,2.6rem);
}
.foot-brand__mark{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--gold);
  margin-bottom:.75rem;
}
.foot-brand__name{
  font-size:clamp(1.35rem,2.6vw,1.7rem);
  color:var(--paper-pure);
  margin-bottom:.65rem;
}
.foot-brand__desc{
  max-width:34ch;
  font-size:.92rem;
  color:var(--mist);
  margin-bottom:.85rem;
}
.foot-brand__meta{
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--steel);
  margin-bottom:1.15rem;
}
.foot-cta{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.55rem .95rem;
  font-size:.82rem;
  font-weight:800;
  letter-spacing:.04em;
  color:var(--gold-hi);
  text-decoration:none;
  border:1px solid rgba(201,162,75,.55);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%);
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.foot-cta:hover{
  background:rgba(201,162,75,.16);
  border-color:var(--gold-hi);
  color:var(--paper-pure);
}
.foot-col__title{
  display:flex;
  align-items:center;
  gap:.5rem;
  font-size:.92rem;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--paper-pure);
  margin-bottom:.9rem;
}
.foot-col__title::before{
  content:"";
  width:2px;
  height:13px;
  background:linear-gradient(180deg,var(--gold-hi),var(--gold));
}
.foot-col__list{display:flex;flex-direction:column;gap:.15rem;}
.foot-link{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding-block:.22rem;
  font-size:.9rem;
  color:var(--mist);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.foot-link::before{
  content:"";
  width:8px;
  height:1px;
  background:currentColor;
  opacity:.55;
  transition:width var(--dur) var(--ease),opacity var(--dur) var(--ease),background var(--dur) var(--ease);
}
.foot-link:hover{color:var(--gold-hi);}
.foot-link:hover::before{width:16px;opacity:1;background:var(--gold-hi);}
.foot-contact__list{display:grid;gap:.85rem;}
.foot-contact__row{display:grid;gap:.15rem;}
.foot-contact__label{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--steel);
}
.foot-contact__value{
  margin:0;
  font-size:.9rem;
  line-height:1.7;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.foot-contact .foot-cta{margin-top:1.1rem;}
.foot-bottom{
  max-width:1240px;
  margin-inline:auto;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.4rem 1.6rem;
  padding:1rem 0 1.5rem;
  border-top:1px solid rgba(92,115,135,.26);
  font-family:var(--mono);
  font-size:.71rem;
  letter-spacing:.06em;
  color:var(--steel);
}
.foot-bottom__icp{color:var(--mist);}
.foot-bottom__note{color:var(--steel);overflow-wrap:anywhere;}

@media (min-width:700px){
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .foot-brand{grid-column:1 / -1;}
}
@media (min-width:1080px){
  .foot-grid{grid-template-columns:1.5fr .8fr .8fr 1.2fr;align-items:start;}
  .foot-brand{grid-column:auto;}
}

/* ============================================================
   通用组件
   ============================================================ */
/* 面板 */
.panel{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.8rem);
  background:linear-gradient(160deg,rgba(15,39,64,.94),rgba(8,24,38,.96));
  border:1px solid rgba(92,115,135,.3);
  color:var(--paper);
}
.panel--cut{
  border:0;
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
}
.panel--cut::after{
  content:"";
  position:absolute;
  inset-inline:0;
  top:0;
  height:2px;
  background:linear-gradient(90deg,var(--gold),rgba(201,162,75,0));
}
.panel--light{
  background:linear-gradient(160deg,var(--paper-pure),var(--paper));
  border-color:rgba(8,24,38,.12);
  color:var(--ink);
}
.panel--light .eyebrow{color:#8A6B24;}
.panel--light .coord{color:#556A7C;}
.panel--gold{
  background:linear-gradient(160deg,rgba(201,162,75,.22),rgba(15,39,64,.94) 70%);
  border:1px solid rgba(201,162,75,.5);
  color:var(--paper-pure);
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  padding:.72rem 1.15rem;
  font-size:.9rem;
  font-weight:800;
  letter-spacing:.02em;
  color:var(--paper-pure);
  text-decoration:none;
  background:transparent;
  border:1px solid rgba(201,162,75,.55);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{
  background:rgba(201,162,75,.16);
  border-color:var(--gold-hi);
  color:var(--gold-hi);
  transform:translateY(-1px);
}
.btn--gold{
  background:linear-gradient(135deg,var(--gold-hi),var(--gold));
  border-color:transparent;
  color:#0A1A28;
}
.btn--gold:hover{
  background:linear-gradient(135deg,#F0D89C,var(--gold-hi));
  color:#0A1A28;
}
.btn--amber{
  background:var(--amber);
  border-color:transparent;
  color:#1A0D03;
}
.btn--amber:hover{
  background:#F29A55;
  color:#1A0D03;
}
.btn--ghost{
  border-color:rgba(147,167,182,.45);
  color:var(--paper);
}
.btn--block{display:flex;width:100%;}

/* 标签 */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.26rem .55rem;
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
  border:1px solid rgba(147,167,182,.4);
}
.tag--gold{
  color:var(--gold-hi);
  border-color:rgba(201,162,75,.55);
  background:rgba(201,162,75,.1);
}
.tag--amber{
  color:#FFD9B8;
  border-color:rgba(232,135,58,.6);
  background:rgba(232,135,58,.14);
}

/* 面包屑 */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.45rem;
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--steel);
}
.breadcrumb__link{
  color:var(--mist);
  text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.breadcrumb__link:hover{color:var(--gold-hi);}
.breadcrumb__sep{color:var(--steel);opacity:.7;}
.breadcrumb__current{color:var(--gold);}

/* 图片容器（页面阶段放置占位图） */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid rgba(92,115,135,.32);
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(201,162,75,.24), transparent 60%),
    radial-gradient(100% 80% at 92% 102%, rgba(232,135,58,.2), transparent 66%),
    linear-gradient(160deg,#0F2740,#071522 72%);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 22px) 100%,0 100%);
}
.media-frame::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(to right, rgba(147,167,182,.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(147,167,182,.16) 1px, transparent 1px);
  background-size:48px 48px;
  opacity:.75;
  pointer-events:none;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset-inline:0;
  top:0;
  height:2px;
  background:linear-gradient(90deg,var(--gold-hi),rgba(201,162,75,0));
}
.media-frame img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:3 / 4;}

/* Bento 基础网格 */
.bento-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(.9rem,2vw,1.4rem);
}
@media (min-width:720px){
  .bento-grid{grid-template-columns:repeat(6,minmax(0,1fr));}
}

/* ============================================================
   可访问性与动效降级
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
}