:root{
  --ink:#071A16;
  --panel:#0B2B24;
  --line:#123D33;
  --gold:#C9A24B;
  --gold-lit:#E6C77A;
  --cyan:#35E0D0;
  --paper:#F3EFE4;
  --mute:#8FA79C;
  --copper:#D98E5F;
  --teal:#1B6F63;

  --rail-w:248px;
  --bar-h:62px;
  --gutter:clamp(1rem,2.6vw,2.75rem);
  --maxw:1240px;
  --bd:2px;
  --shadow-hard:7px 7px 0 rgba(18,61,51,.85);
  --ease:cubic-bezier(.2,.7,.3,1);

  --font-title:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}

*,*::before,*::after{box-sizing:border-box;}
*{margin:0;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  overflow-x:hidden;
  scroll-padding-top:calc(var(--bar-h) + 1rem);
}
body{
  min-height:100vh;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:clamp(16px,.32vw + 15px,17px);
  font-weight:400;
  line-height:1.75;
  padding-inline-start:0;
  padding-block-start:0;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{display:block;max-width:100%;}
img{height:auto;}
ul,ol{padding:0;}
button{font:inherit;color:inherit;}
main{display:block;}
main[tabindex="-1"]:focus{outline:none;}

/* ---------- 排版 ---------- */
h1,h2,h3,h4,h5{
  font-family:var(--font-title);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.15;
  text-wrap:balance;
  margin-block-end:.55em;
  color:var(--paper);
}
h1{font-size:clamp(2.15rem,4.4vw,3.6rem);font-weight:900;}
h2{font-size:clamp(1.6rem,2.8vw,2.5rem);}
h3{font-size:clamp(1.12rem,1.5vw,1.4rem);font-weight:700;letter-spacing:-.01em;}
h4{font-size:1rem;font-weight:700;letter-spacing:0;}
p{margin-block-end:1.1em;}
p:last-child{margin-block-end:0;}
a{color:var(--cyan);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:rgba(53,224,208,.45);transition:color .18s var(--ease),text-decoration-color .18s var(--ease);}
a:hover{color:var(--gold-lit);text-decoration-color:var(--gold);}
strong,b{font-weight:700;color:var(--gold-lit);}
small{font-size:.8rem;}
code,kbd,samp{font-family:var(--font-mono);font-size:.86em;color:var(--cyan);}
blockquote{
  margin:0;
  padding:.35rem 0 .35rem 1.25rem;
  border-inline-start:3px solid var(--gold);
  color:#DCE5DF;
  font-size:1.05rem;
}
hr{border:0;}
::selection{background:var(--gold);color:var(--ink);}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;}

/* ---------- 通用工具 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.grid{display:grid;gap:clamp(1rem,2.5vw,2rem);}
.stack > * + *{margin-block-start:1rem;}
.rule{height:var(--bd);background:var(--line);border:0;margin-block:clamp(1.5rem,4vw,2.5rem);}
.eyebrow{
  display:block;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.3em;
  text-transform:uppercase;
  color:var(--cyan);
  margin-block-end:.65rem;
}
.lede{
  font-size:clamp(1.02rem,1.35vw,1.18rem);
  line-height:1.72;
  color:#DCE5DF;
  max-width:62ch;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}
.mute{color:var(--mute);}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  padding:.26rem .65rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--cyan);
  background:var(--panel);
  border:1px solid var(--line);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.55rem;
  padding:.8rem 1.35rem;
  font-family:var(--font-title);
  font-weight:800;
  font-size:.92rem;
  letter-spacing:.01em;
  line-height:1.2;
  text-decoration:none;
  color:var(--ink);
  background:var(--gold);
  border:var(--bd) solid var(--gold-lit);
  box-shadow:5px 5px 0 rgba(53,224,208,.28);
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{
  color:var(--ink);
  background:var(--gold-lit);
  transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 rgba(53,224,208,.45);
}
.btn--ghost{
  color:var(--paper);
  background:transparent;
  border-color:var(--line);
  box-shadow:none;
}
.btn--ghost:hover{
  color:var(--cyan);
  background:var(--panel);
  border-color:var(--cyan);
  box-shadow:6px 6px 0 rgba(201,162,75,.28);
}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  margin-block:clamp(1rem,3vw,1.75rem);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--mute);
}
.crumbs a{color:var(--mute);text-decoration:none;}
.crumbs a:hover{color:var(--cyan);}
.crumbs__sep{color:var(--line);}
.crumbs [aria-current="page"]{color:var(--gold-lit);}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:16 / 10;
  border:var(--bd) solid var(--line);
  box-shadow:var(--shadow-hard);
  background:
    radial-gradient(120% 120% at 12% 0%,rgba(53,224,208,.16),transparent 55%),
    radial-gradient(90% 90% at 92% 100%,rgba(201,162,75,.18),transparent 60%),
    var(--panel);
}
.media > img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.96) contrast(1.03);
}
.media--wide{aspect-ratio:21 / 9;}
.media--tall{aspect-ratio:3 / 4;}
.media--square{aspect-ratio:1 / 1;}
.media--card{aspect-ratio:4 / 3;}
.media__cap{
  margin-block-start:.6rem;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--mute);
}
.media-stack{display:grid;gap:.75rem;}

/* ---------- 头部：侧边轨道 ---------- */
.skip-link{
  position:fixed;
  inset-block-start:.6rem;
  inset-inline-start:.6rem;
  z-index:200;
  padding:.65rem 1.1rem;
  font-family:var(--font-title);
  font-weight:800;
  font-size:.85rem;
  color:var(--ink);
  background:var(--gold);
  border:var(--bd) solid var(--gold-lit);
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus-visible{transform:translateY(0);color:var(--ink);}

.site-rail{
  position:fixed;
  inset-block-start:0;
  inset-inline-start:0;
  z-index:60;
  display:flex;
  flex-direction:column;
  width:var(--rail-w);
  height:100vh;
  height:100dvh;
  padding:1.25rem 1.05rem 1rem;
  background:
    radial-gradient(140% 90% at 0% 0%,rgba(27,111,99,.38),transparent 62%),
    linear-gradient(180deg,#0B2B24 0%,#071A16 72%);
  border-inline-end:var(--bd) solid var(--line);
  box-shadow:20px 0 60px -46px #000;
}

.rail-head{
  display:flex;
  flex-direction:column;
  gap:.75rem;
  padding-block-end:1rem;
  border-block-end:var(--bd) solid var(--line);
}
.rail-brand{
  display:grid;
  gap:.3rem;
  text-decoration:none;
  color:var(--paper);
}
.rail-brand:hover{color:var(--paper);}
.rail-brand__mark{
  justify-self:start;
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.3em;
  color:var(--ink);
  background:var(--gold);
  padding:.16rem .45rem .16rem .55rem;
}
.rail-brand__name{
  font-family:var(--font-title);
  font-weight:900;
  font-size:1.06rem;
  letter-spacing:-.01em;
  line-height:1.25;
}
.rail-brand__tag{
  font-size:.72rem;
  line-height:1.5;
  letter-spacing:.04em;
  color:var(--mute);
}

.rail-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.45rem .7rem;
  font-family:var(--font-title);
  font-weight:700;
  font-size:.8rem;
  color:var(--paper);
  background:var(--panel);
  border:var(--bd) solid var(--line);
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.rail-toggle:hover{border-color:var(--gold);color:var(--gold-lit);}
.rail-toggle__box{display:grid;gap:3px;width:16px;}
.rail-toggle__bar{display:block;height:2px;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease);}
.rail-toggle[aria-expanded="true"] .rail-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg);}
.rail-toggle[aria-expanded="true"] .rail-toggle__bar:nth-child(2){opacity:0;}
.rail-toggle[aria-expanded="true"] .rail-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

.rail-nav{
  display:flex;
  flex-direction:column;
  gap:.85rem;
  flex:1 1 auto;
  min-height:0;
  margin-block-start:1.1rem;
  overflow-y:auto;
  scrollbar-width:thin;
  scrollbar-color:var(--line) transparent;
}
.rail-nav__list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:.2rem;
}
.rail-nav__link{
  position:relative;
  display:grid;
  grid-template-columns:1.9rem minmax(0,1fr);
  align-items:center;
  gap:.5rem;
  padding:.58rem .7rem;
  font-family:var(--font-title);
  font-weight:600;
  font-size:.9rem;
  line-height:1.35;
  color:var(--paper);
  text-decoration:none;
  border:var(--bd) solid transparent;
  transition:background .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease);
}
.rail-nav__link::before{
  content:"";
  position:absolute;
  inset-block:4px;
  inset-inline-start:-2px;
  width:3px;
  background:var(--cyan);
  transform:scaleY(0);
  transform-origin:top center;
  transition:transform .18s var(--ease);
}
.rail-nav__link:hover{
  color:var(--gold-lit);
  background:#123D33;
  border-color:var(--line);
}
.rail-nav__link:hover::before{transform:scaleY(1);}
.rail-nav__link[aria-current="page"]{
  color:var(--gold-lit);
  background:linear-gradient(90deg,rgba(53,224,208,.16),rgba(53,224,208,0) 82%);
  border-color:var(--gold);
}
.rail-nav__link[aria-current="page"]::before{transform:scaleY(1);}
.rail-nav__idx{
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--cyan);
}
.rail-nav__link[aria-current="page"] .rail-nav__idx{color:var(--gold);}
.rail-nav__text{min-width:0;}

.rail-nav__hint{
  margin:0;
  padding-block-start:.85rem;
  border-block-start:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.06em;
  line-height:1.6;
  color:var(--mute);
}
.rail-cta{
  display:block;
  margin-block-start:.1rem;
  padding:.75rem 1rem;
  text-align:center;
  font-family:var(--font-title);
  font-weight:800;
  font-size:.9rem;
  color:var(--ink);
  background:var(--gold);
  border:var(--bd) solid var(--gold-lit);
  box-shadow:4px 4px 0 rgba(53,224,208,.26);
  text-decoration:none;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background .18s var(--ease);
}
.rail-cta:hover{
  color:var(--ink);
  background:var(--gold-lit);
  transform:translate(-1px,-1px);
  box-shadow:6px 6px 0 rgba(53,224,208,.42);
}

.rail-meta{
  display:flex;
  align-items:center;
  gap:.5rem;
  margin-block-start:.9rem;
  padding-block-start:.85rem;
  border-block-start:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.06em;
  color:var(--mute);
}
.rail-meta__dot{
  flex:0 0 auto;
  width:7px;
  height:7px;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,224,208,.16);
}
.rail-meta__text{line-height:1.5;}

.rail-progress{
  position:absolute;
  inset-inline:0;
  inset-block-end:0;
  height:4px;
  background:var(--line);
}
.rail-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--gold),var(--cyan));
  transition:width .12s linear;
}

body[data-nav-open]{overflow:hidden;}

/* ---------- 页脚 ---------- */
.site-foot{
  position:relative;
  margin-block-start:clamp(3rem,7vw,6rem);
  padding:clamp(2rem,5vw,3.5rem) var(--gutter) 1.25rem;
  color:var(--paper);
  background:
    radial-gradient(120% 130% at 0% 0%,rgba(27,111,99,.24),transparent 58%),
    radial-gradient(90% 90% at 100% 0%,rgba(201,162,75,.12),transparent 55%),
    var(--ink);
  border-block-start:var(--bd) solid var(--line);
}
.foot-inner{
  max-width:var(--maxw);
  margin-inline:auto;
  display:grid;
  gap:clamp(1.75rem,4vw,3rem);
  grid-template-columns:minmax(0,1fr);
}
.foot-lead{min-width:0;}
.foot-wordmark{
  font-family:var(--font-title);
  font-weight:900;
  font-size:clamp(1.5rem,3.4vw,2.35rem);
  letter-spacing:-.02em;
  line-height:1.1;
  margin-block-end:.65rem;
  color:var(--gold-lit);
}
@supports ((-webkit-background-clip:text) or (background-clip:text)){
  .foot-wordmark{
    background:linear-gradient(96deg,var(--gold-lit) 0%,var(--gold) 42%,var(--cyan) 100%);
    -webkit-background-clip:text;
    background-clip:text;
    color:transparent;
  }
}
.foot-summary{
  max-width:36ch;
  font-size:.94rem;
  line-height:1.7;
  color:var(--mute);
}
.foot-cols{
  display:grid;
  gap:clamp(1.25rem,3vw,2.5rem);
  grid-template-columns:minmax(0,1fr);
}
.foot-col{min-width:0;}
.foot-col__title{
  margin-block-end:.7rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  font-weight:700;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.foot-list{
  list-style:none;
  display:grid;
  gap:.45rem;
  font-size:.9rem;
  line-height:1.6;
}
.foot-list a{
  color:var(--paper);
  text-decoration:none;
  border-block-end:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.foot-list a:hover{color:var(--gold-lit);border-block-end-color:var(--gold);}
.foot-list--plain li{
  display:grid;
  grid-template-columns:4.9em minmax(0,1fr);
  gap:.55rem;
  align-items:start;
  color:var(--mute);
  font-size:.86rem;
}
.foot-key{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.08em;
  color:var(--cyan);
  padding-block-start:.16rem;
}
.foot-base{
  max-width:var(--maxw);
  margin:clamp(1.75rem,4vw,2.75rem) auto 0;
  padding-block-start:1rem;
  border-block-start:var(--bd) solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.85rem;
}
.foot-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.02em;
  line-height:1.6;
  color:var(--mute);
}
.foot-dot{color:var(--gold);}
.foot-top{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.5rem .95rem;
  font-family:var(--font-title);
  font-weight:700;
  font-size:.8rem;
  color:var(--paper);
  background:transparent;
  border:var(--bd) solid var(--line);
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.foot-top:hover{
  color:var(--gold-lit);
  border-color:var(--gold);
  transform:translate(-1px,-1px);
  box-shadow:4px 4px 0 rgba(53,224,208,.24);
}

/* ---------- 平板 ---------- */
@media (min-width:760px){
  .foot-inner{grid-template-columns:minmax(0,1fr) minmax(0,2fr);}
  .foot-cols{grid-template-columns:repeat(2,minmax(0,1fr));}
}

/* ---------- 桌面：轨道常驻，内容右移 ---------- */
@media (min-width:1024px){
  body{padding-inline-start:var(--rail-w);}
  .rail-toggle{display:none;}
  .foot-cols{grid-template-columns:repeat(3,minmax(0,1fr));}
}

/* ---------- 移动与小型平板：轨道塌缩为顶栏 + 抽屉 ---------- */
@media (max-width:1023px){
  html{scroll-padding-top:calc(var(--bar-h) + .75rem);}
  body{padding-inline-start:0;padding-block-start:var(--bar-h);}

  .site-rail{
    inset:0 0 auto 0;
    width:100%;
    height:var(--bar-h);
    flex-direction:row;
    align-items:center;
    padding:0 var(--gutter);
    border-inline-end:0;
    border-block-end:var(--bd) solid var(--line);
    background:rgba(7,26,22,.96);
    box-shadow:0 16px 40px -32px #000;
    -webkit-backdrop-filter:blur(10px);
    backdrop-filter:blur(10px);
  }
  .rail-head{
    width:100%;
    flex-direction:row;
    align-items:center;
    justify-content:space-between;
    gap:1rem;
    padding-block-end:0;
    border-block-end:0;
  }
  .rail-brand{
    display:flex;
    align-items:center;
    gap:.55rem;
    min-width:0;
  }
  .rail-brand__name{font-size:.94rem;white-space:nowrap;}
  .rail-brand__tag{display:none;}
  .rail-brand__mark{font-size:.6rem;padding:.1rem .35rem .1rem .45rem;}
  .rail-toggle{display:inline-flex;flex:0 0 auto;}

  .rail-nav{
    position:fixed;
    inset-block-start:var(--bar-h);
    inset-inline:0;
    display:none;
    flex:0 0 auto;
    flex-direction:column;
    gap:.75rem;
    margin-block-start:0;
    padding:1rem var(--gutter) 1.5rem;
    max-height:calc(100vh - var(--bar-h));
    overflow-y:auto;
    background:linear-gradient(180deg,#0B2B24,#071A16);
    border-block-end:var(--bd) solid var(--gold);
    box-shadow:0 34px 60px -34px #000;
    z-index:59;
  }
  .rail-nav[data-open]{display:flex;}
  .rail-nav__list{gap:.3rem;}
  .rail-nav__link{
    padding:.85rem .8rem;
    font-size:1rem;
    grid-template-columns:2.1rem minmax(0,1fr);
    border-color:var(--line);
    background:rgba(18,61,51,.35);
  }
  .rail-nav__hint{padding-block-start:.75rem;}
  .rail-cta{padding:.85rem 1rem;font-size:.95rem;}
  .rail-meta{display:none;}
  .rail-progress{inset-block-end:-2px;}
}

/* ---------- 极小屏 ---------- */
@media (max-width:380px){
  .rail-brand__name{font-size:.86rem;}
  .rail-toggle__label{display:none;}
  .foot-list--plain li{grid-template-columns:1fr;}
  .foot-key{padding-block-start:0;}
}

/* ---------- 动效偏好 ---------- */
@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;
  }
  .rail-progress__bar{transition:none !important;}
  .btn:hover,.foot-top:hover,.rail-cta:hover{transform:none;}
}