:root{
  --ink:#0B1220;
  --ink-2:#101B33;
  --slate:#1E3A5F;
  --cream:#F5EDD8;
  --gold:#C9A25B;
  --sand:#D9CAB3;
  --coral:#E8795A;
  --brown:#2C241C;
  --mist:#8FA3BF;
  --paper:#F2F4F8;
  --mint:#3FBFA8;

  --rail:232px;
  --bar:58px;
  --gutter:24px;
  --maxw:1280px;
  --radius:16px;

  --scroll-progress:0;

  --font-display:'Space Grotesk','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Noto Serif SC','Songti SC','Source Han Serif SC','SimSun',Georgia,serif;
  --font-index:'IBM Plex Mono','SFMono-Regular','Consolas','Noto Sans SC',monospace;
}

*,
*::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; list-style:none; }

img,svg,video{ display:block; max-width:100%; }

a{ color:inherit; }

button{ font:inherit; color:inherit; background:none; border:0; }

body{
  margin:0;
  padding-left:var(--rail);
  min-height:100vh;
  background:
    radial-gradient(1200px 720px at 82% -12%, rgba(30,58,95,.58), transparent 62%),
    radial-gradient(900px 620px at 4% 106%, rgba(232,121,90,.10), transparent 66%),
    var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:300;
  line-height:1.14;
  letter-spacing:-.01em;
  color:var(--paper);
}

p{ line-height:1.8; }

::selection{
  background:rgba(201,162,91,.35);
  color:var(--paper);
}

:focus-visible{
  outline:2px solid var(--coral);
  outline-offset:3px;
  border-radius:6px;
}

#main-content{ scroll-margin-top:calc(var(--bar) + 20px); }

.sr-only{
  position:absolute;
  width:1px; height:1px;
  padding:0; margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

.skip-link{
  position:fixed;
  top:10px; left:10px;
  z-index:200;
  padding:10px 18px;
  border-radius:999px;
  background:var(--gold);
  color:#0B1220;
  font-family:var(--font-index);
  font-size:13px;
  letter-spacing:.06em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .18s ease;
}

.skip-link:focus,
.skip-link:focus-visible{ transform:none; }

/* ===== 轨道头部 ===== */
.site-header{
  position:fixed;
  top:0; bottom:0; left:0;
  z-index:90;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  gap:24px;
  padding:26px 18px 22px;
  background:linear-gradient(180deg, rgba(16,27,51,.94), rgba(8,14,26,.97));
  border-right:1px solid rgba(201,162,91,.2);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
}

.site-header::after{
  content:"";
  position:absolute;
  top:0; right:0;
  width:2px;
  height:100%;
  background:linear-gradient(180deg, var(--gold), var(--coral));
  transform:scaleY(var(--scroll-progress));
  transform-origin:top center;
  pointer-events:none;
}

.header-top{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
}

.brand-block{
  display:flex;
  align-items:center;
  gap:11px;
  text-decoration:none;
  color:inherit;
  min-width:0;
}

.brand-mark{
  position:relative;
  flex:0 0 34px;
  width:34px; height:34px;
  display:grid;
  place-items:center;
  border:1px solid rgba(201,162,91,.6);
  border-radius:50%;
  background:radial-gradient(circle at 30% 25%, rgba(201,162,91,.22), transparent 70%);
}

.brand-mark::before{
  content:"";
  width:11px; height:11px;
  border:1px solid var(--gold);
  transform:rotate(45deg);
}

.brand-mark-dot{
  position:absolute;
  top:-2px; right:-2px;
  width:6px; height:6px;
  border-radius:50%;
  background:var(--coral);
}

.brand-text{ display:block; min-width:0; }

.brand-name{
  display:block;
  font-family:var(--font-display);
  font-size:17px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--paper);
  white-space:nowrap;
}

.brand-tag{
  display:block;
  margin-top:5px;
  font-family:var(--font-index);
  font-size:10px;
  line-height:1.5;
  letter-spacing:.1em;
  color:var(--mist);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 13px;
  border-radius:999px;
  background:rgba(201,162,91,.1);
  border:1px solid rgba(201,162,91,.42);
  color:var(--gold);
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:background .18s ease, border-color .18s ease, color .18s ease;
}

.nav-toggle:hover{
  background:rgba(201,162,91,.18);
  border-color:rgba(201,162,91,.7);
  color:var(--paper);
}

.nav-toggle-bars{ display:block; width:16px; }

.nav-toggle-bars i{
  display:block;
  height:1px;
  background:currentColor;
  margin:4px 0;
  transition:transform .2s ease;
}

.site-header[data-open="true"] .nav-toggle-bars i:first-child{
  transform:translateY(2.5px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle-bars i:last-child{
  transform:translateY(-2.5px) rotate(-45deg);
}

.site-nav{
  display:flex;
  flex-direction:column;
  flex:1 1 auto;
  min-height:0;
  overflow-y:auto;
  scrollbar-width:thin;
}

.nav-eyebrow{
  margin:0 0 10px 12px;
  font-family:var(--font-index);
  font-size:10px;
  letter-spacing:.24em;
  color:rgba(143,163,191,.65);
}

.nav-list{ display:grid; gap:2px; }

.nav-item{ min-width:0; }

.nav-link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:10px 12px;
  border-radius:10px;
  border-left:2px solid transparent;
  text-decoration:none;
  color:var(--mist);
  font-family:var(--font-display);
  font-size:15px;
  letter-spacing:.03em;
  transition:color .18s ease, background .18s ease, border-color .18s ease;
}

.nav-link:hover{
  color:var(--paper);
  background:rgba(201,162,91,.08);
}

.nav-link:focus-visible{
  outline-offset:2px;
}

.nav-link[aria-current="page"]{
  color:var(--gold);
  border-left-color:var(--gold);
  background:linear-gradient(90deg, rgba(201,162,91,.18), rgba(201,162,91,0));
}

.nav-index{
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.08em;
  color:rgba(143,163,191,.7);
}

.nav-link[aria-current="page"] .nav-index{ color:var(--coral); }

.nav-label{ white-space:nowrap; }

.rail-foot{
  margin-top:auto;
  padding:20px 12px 4px;
  border-top:1px solid rgba(143,163,191,.18);
}

.rail-note{
  font-size:13px;
  line-height:1.7;
  color:var(--mist);
}

.rail-cta{
  margin-top:14px;
  width:100%;
  justify-content:center;
}

/* ===== 页脚 ===== */
.site-footer{
  margin-top:clamp(56px,9vw,120px);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(30,58,95,.55), transparent 62%),
    linear-gradient(180deg, #0d1728, #070b13);
  border-top:1px solid rgba(201,162,91,.3);
  color:var(--paper);
}

.footer-inner{
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(36px,5vw,68px) clamp(20px,4vw,48px) 26px;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:32px 28px;
}

.footer-brand-line{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:400;
  letter-spacing:.07em;
  color:var(--paper);
}

.footer-note{
  margin-top:12px;
  max-width:34ch;
  color:var(--mist);
  font-size:14.5px;
  line-height:1.8;
}

.footer-cta{ margin-top:18px; }

.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.22em;
  color:rgba(201,162,91,.85);
}

.footer-links{ display:grid; gap:9px; }

.footer-link{
  color:var(--mist);
  font-size:15px;
  text-decoration:none;
  transition:color .18s ease;
}

.footer-link:hover{ color:var(--gold); }

.footer-contact{
  margin-top:clamp(28px,4vw,44px);
  padding-top:24px;
  border-top:1px solid rgba(143,163,191,.18);
  display:grid;
  grid-template-columns:repeat(4, minmax(0,1fr));
  gap:20px 24px;
}

.footer-contact-item{ min-width:0; }

.footer-contact-label{
  margin-bottom:6px;
  font-family:var(--font-index);
  font-size:10.5px;
  letter-spacing:.2em;
  color:rgba(143,163,191,.82);
}

.footer-contact-value{
  color:var(--paper);
  font-size:14.5px;
  line-height:1.65;
  word-break:break-word;
}

.footer-contact-note{
  color:var(--mist);
  font-size:13.5px;
  line-height:1.7;
}

.footer-legal{
  margin-top:26px;
  padding-top:18px;
  border-top:1px solid rgba(143,163,191,.18);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 24px;
  font-family:var(--font-index);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--mist);
}

.footer-copy,
.footer-icp{ line-height:1.6; }

.footer-icp{ color:rgba(201,162,91,.8); }

/* ===== 通用布局 ===== */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,48px);
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12, minmax(0,1fr));
  gap:var(--gutter);
}

.grid-12 > *{ grid-column:1 / -1; }

@media (min-width:768px){
  .span-3{ grid-column:span 3; }
  .span-4{ grid-column:span 4; }
  .span-5{ grid-column:span 5; }
  .span-6{ grid-column:span 6; }
  .span-7{ grid-column:span 7; }
  .span-8{ grid-column:span 8; }
  .span-9{ grid-column:span 9; }
  .span-12{ grid-column:span 12; }
}

/* ===== 章节与标题 ===== */
.section{ padding-block:clamp(40px,6vw,88px); }

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px 28px;
  margin-bottom:clamp(20px,3vw,36px);
}

.section-index{
  display:block;
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.22em;
  color:var(--coral);
}

.section-title{
  margin-top:8px;
  font-size:clamp(26px,3.4vw,42px);
  font-weight:300;
}

.section-note{
  max-width:48ch;
  color:var(--mist);
  font-size:15px;
  line-height:1.8;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--gold);
}

.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:currentColor;
}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-index);
  font-size:13px;
  letter-spacing:.06em;
  text-decoration:none;
  cursor:pointer;
  transition:background .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}

.btn:active{ transform:translateY(1px); }

.btn--gold{
  background:var(--gold);
  color:#0B1220;
  border-color:var(--gold);
}

.btn--gold:hover{
  background:#d8b372;
  border-color:#d8b372;
}

.btn--ghost{
  background:rgba(255,255,255,.04);
  color:var(--paper);
  border-color:rgba(201,162,91,.45);
}

.btn--ghost:hover{
  background:rgba(201,162,91,.14);
  border-color:rgba(201,162,91,.85);
  color:var(--gold);
}

.btn--coral{
  background:var(--coral);
  color:#24100a;
  border-color:var(--coral);
}

.btn--coral:hover{
  background:#f08e72;
  border-color:#f08e72;
}

/* ===== 卡面 ===== */
.card{
  border-radius:var(--radius);
  padding:clamp(18px,2.2vw,28px);
  transition:border-color .2s ease, transform .2s ease, background .2s ease;
}

.card--glass{
  background:linear-gradient(160deg, rgba(16,27,51,.72), rgba(11,18,32,.55));
  border:1px solid rgba(201,162,91,.24);
  color:var(--paper);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}

.card--cream{
  background:var(--cream);
  border:1px solid rgba(44,36,28,.12);
  color:var(--brown);
}

.card--cream h2,
.card--cream h3,
.card--cream h4{ color:var(--brown); }

.card--slate{
  background:linear-gradient(155deg, var(--slate), #16283f);
  border:1px solid rgba(201,162,91,.2);
  color:var(--paper);
}

/* ===== 标签 ===== */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.08em;
  line-height:1.6;
}

.tag--gold{
  color:var(--gold);
  border-color:rgba(201,162,91,.5);
  background:rgba(201,162,91,.1);
}

.tag--coral{
  color:var(--coral);
  border-color:rgba(232,121,90,.5);
  background:rgba(232,121,90,.1);
}

.tag--mint{
  color:var(--mint);
  border-color:rgba(63,191,168,.5);
  background:rgba(63,191,168,.1);
}

.tag--sand{
  color:var(--sand);
  border-color:rgba(217,202,179,.4);
  background:rgba(217,202,179,.08);
}

/* ===== 面包屑 ===== */
.breadcrumb{ padding-block:18px; }

.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  font-family:var(--font-index);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--mist);
}

.breadcrumb-item{ display:flex; align-items:center; gap:10px; }

.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  color:rgba(143,163,191,.5);
}

.breadcrumb-link{
  color:var(--mist);
  text-decoration:none;
  transition:color .18s ease;
}

.breadcrumb-link:hover{ color:var(--gold); }

.breadcrumb-current{ color:var(--gold); }

/* ===== 图片容器基础规则 ===== */
.media-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--radius);
  border:1px solid rgba(201,162,91,.22);
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(30,58,95,.95), transparent 62%),
    radial-gradient(80% 70% at 92% 100%, rgba(201,162,91,.22), transparent 66%),
    #0d1728;
}

.media-frame--wide{ aspect-ratio:16 / 9; }
.media-frame--square{ aspect-ratio:1 / 1; }
.media-frame--tall{ aspect-ratio:3 / 4; }

.media-frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
}

.media-placeholder{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:16px;
  text-align:center;
  font-family:var(--font-index);
  font-size:11px;
  letter-spacing:.18em;
  line-height:1.9;
  color:rgba(143,163,191,.72);
}

/* ===== 可展开内容组 ===== */
.disclosure{ border-top:1px solid rgba(143,163,191,.2); }

.disclosure-item{ border-bottom:1px solid rgba(143,163,191,.2); }

.disclosure-trigger{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 0;
  text-align:left;
  cursor:pointer;
  color:var(--paper);
  font-family:var(--font-display);
  font-size:17px;
  font-weight:400;
  transition:color .18s ease;
}

.disclosure-trigger:hover{ color:var(--gold); }

.disclosure-title{ flex:1 1 auto; }

.disclosure-icon{
  position:relative;
  flex:0 0 18px;
  width:18px;
  height:18px;
  border:1px solid rgba(201,162,91,.55);
  border-radius:50%;
}

.disclosure-icon::before,
.disclosure-icon::after{
  content:"";
  position:absolute;
  top:50%;
  left:50%;
  background:var(--gold);
  transform:translate(-50%,-50%);
}

.disclosure-icon::before{ width:8px; height:1px; }

.disclosure-icon::after{
  width:1px;
  height:8px;
  transition:transform .2s ease, opacity .2s ease;
}

.disclosure-item[data-open="true"] .disclosure-icon::after{
  transform:translate(-50%,-50%) scaleY(0);
  opacity:0;
}

.disclosure-panel{
  display:grid;
  grid-template-rows:0fr;
  opacity:0;
  visibility:hidden;
  transition:grid-template-rows .22s ease, opacity .18s ease, visibility 0s linear .22s;
}

.disclosure-panel > *{
  overflow:hidden;
  min-height:0;
}

.disclosure-item[data-open="true"] .disclosure-panel{
  grid-template-rows:1fr;
  opacity:1;
  visibility:visible;
  transition:grid-template-rows .22s ease, opacity .18s ease, visibility 0s;
}

.disclosure-body{
  padding:0 0 20px;
  color:var(--mist);
  font-family:var(--font-body);
  font-size:15.5px;
  line-height:1.85;
}

.disclosure-body p + p{ margin-top:10px; }

/* ===== 返回顶部 ===== */
.to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:80;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  border-radius:50%;
  border:1px solid rgba(201,162,91,.5);
  background:rgba(16,27,51,.88);
  color:var(--gold);
  font-family:var(--font-index);
  font-size:15px;
  cursor:pointer;
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .2s ease, transform .2s ease, visibility 0s linear .2s, border-color .2s ease;
}

.to-top[data-visible="true"]{
  opacity:1;
  visibility:visible;
  transform:none;
  transition:opacity .2s ease, transform .2s ease, visibility 0s, border-color .2s ease;
}

.to-top:hover{ border-color:var(--gold); }

/* ===== 移动端外壳 ===== */
@media (max-width:1023px){
  body{
    padding-left:0;
    padding-top:var(--bar);
  }

  body::before{
    content:"";
    position:fixed;
    top:var(--bar);
    left:0;
    right:0;
    height:2px;
    z-index:95;
    background:linear-gradient(90deg, var(--gold), var(--coral));
    transform:scaleX(var(--scroll-progress));
    transform-origin:left center;
    pointer-events:none;
  }

  .site-header{
    top:0;
    left:0;
    right:0;
    bottom:auto;
    width:auto;
    height:var(--bar);
    justify-content:center;
    gap:0;
    padding:0 16px;
    border-right:0;
    border-bottom:1px solid rgba(201,162,91,.2);
    background:linear-gradient(180deg, rgba(13,22,40,.98), rgba(10,17,32,.96));
  }

  .site-header::after{ display:none; }

  .header-top{
    width:100%;
    align-items:center;
  }

  .brand-mark{
    flex:0 0 30px;
    width:30px;
    height:30px;
  }

  .brand-name{
    font-size:16px;
    letter-spacing:.12em;
  }

  .brand-tag{ display:none; }

  .nav-toggle{ display:inline-flex; }

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    max-height:0;
    overflow:hidden;
    padding:0 16px;
    background:rgba(10,17,32,.985);
    border-bottom:1px solid rgba(201,162,91,.24);
    -webkit-backdrop-filter:blur(16px);
    backdrop-filter:blur(16px);
    visibility:hidden;
    transition:max-height .26s ease, padding .26s ease, visibility 0s linear .26s;
  }

  .site-header[data-open="true"] .site-nav{
    max-height:78vh;
    overflow-y:auto;
    padding:16px 16px 22px;
    visibility:visible;
    transition:max-height .26s ease, padding .26s ease, visibility 0s;
  }

  .nav-eyebrow{ margin-left:0; }

  .nav-link{
    font-size:16px;
    padding:13px 12px;
  }

  .rail-foot{
    margin-top:6px;
    padding:18px 0 0;
  }

  .rail-cta{
    width:auto;
    padding:11px 20px;
  }

  .footer-grid{ grid-template-columns:1fr 1fr; }
  .footer-contact{ grid-template-columns:1fr 1fr; }
}

@media (max-width:620px){
  .footer-grid{ grid-template-columns:1fr; gap:26px; }
  .footer-contact{ grid-template-columns:1fr; gap:16px; }
  .footer-legal{ flex-direction:column; }
  .to-top{ right:14px; bottom:14px; }
}

@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:0s !important;
  }
}