*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,li,dl,dt,dd,figure,blockquote,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,picture,video,canvas{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

:root{
  --violet:#4B1E5B;
  --violet-deep:#2A1038;
  --vine:#1E6B5A;
  --gold:#D9A441;
  --wine:#8C2F4A;
  --mist:#E9DCEB;
  --paper:#F8F4EC;
  --ink:#1B151D;
  --ash:#8A7A90;
  --celadon:#DDE8E2;
  --rail-w:88px;
  --gutter:24px;
  --maxw:1280px;
  --radius:10px;
  --font-heading:"Noto Serif SC","Source Han Serif SC","Songti SC",STSong,serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --shadow-card:0 1px 0 rgba(27,21,29,.04),0 16px 30px -26px rgba(42,16,56,.6);
}

body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  color:var(--ink);
  background:var(--paper);
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
#main-content{display:block;outline:none}
::selection{background:var(--gold);color:var(--ink)}

h1,h2,h3,h4{font-family:var(--font-heading);font-weight:800;line-height:1.12;letter-spacing:.01em;color:var(--ink)}
h1{font-size:clamp(32px,5vw,60px)}
h2{font-size:clamp(26px,3.4vw,42px)}
h3{font-size:clamp(19px,2vw,26px);font-weight:700}
h4{font-size:18px;font-weight:700}
p{max-width:68ch}

:where(a,button,summary,input,[tabindex]):focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- 头部：藤蔓轨道导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:linear-gradient(180deg,#2A1038 0%,#3A1548 100%);
  color:var(--paper);
  border-bottom:1px solid rgba(217,164,65,.26);
}
.skip-link{
  position:fixed;
  top:10px;
  inset-inline-start:10px;
  z-index:200;
  padding:10px 18px;
  border-radius:999px;
  background:var(--gold);
  color:var(--ink);
  font-size:14px;
  font-weight:600;
  letter-spacing:.08em;
  transform:translateY(-180%);
  transition:transform .2s ease;
  box-shadow:0 12px 26px -14px rgba(0,0,0,.65);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

.rail{
  display:flex;
  align-items:center;
  gap:12px;
  padding:11px 16px;
  min-height:62px;
}
.rail__brand{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 1 auto;
  min-width:0;
  position:relative;
  z-index:3;
  color:var(--paper);
}
.rail__mark{
  position:relative;
  flex:none;
  width:22px;
  height:22px;
  border:1px solid rgba(217,164,65,.85);
  border-radius:3px;
  transform:rotate(45deg);
  transition:transform .3s ease,border-color .3s ease;
}
.rail__mark::after{
  content:"";
  position:absolute;
  inset:6px;
  border-radius:50%;
  background:var(--gold);
}
.rail__brand:hover .rail__mark{transform:rotate(135deg);border-color:var(--gold)}
.rail__brand-text{display:flex;flex-direction:column;gap:2px;min-width:0}
.rail__brand-name{
  font-family:var(--font-heading);
  font-size:15px;
  font-weight:800;
  letter-spacing:.14em;
  line-height:1.2;
  white-space:nowrap;
}
.rail__brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:rgba(217,164,65,.85);
  line-height:1.2;
}
.rail__toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin-inline-start:auto;
  padding:8px 14px;
  border:1px solid rgba(217,164,65,.5);
  border-radius:999px;
  color:var(--paper);
  font-size:12.5px;
  letter-spacing:.16em;
  position:relative;
  z-index:3;
  transition:background-color .18s ease,border-color .18s ease;
}
.rail__toggle:hover{background:rgba(217,164,65,.14);border-color:var(--gold)}
.rail__toggle-bars{position:relative;display:block;width:16px;height:10px;flex:none}
.rail__toggle-bars::before,
.rail__toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:1.5px;
  background:var(--gold);
  transition:transform .24s ease,top .24s ease;
}
.rail__toggle-bars::before{top:0}
.rail__toggle-bars::after{top:8px}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars::before{top:4px;transform:rotate(45deg)}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars::after{top:4px;transform:rotate(-45deg)}

.rail__nav{
  position:fixed;
  inset:0 0 auto 0;
  z-index:1;
  max-height:100vh;
  overflow-y:auto;
  padding:78px 20px 32px;
  background:linear-gradient(180deg,#2A1038 0%,#38143F 58%,#2A1038 100%);
  border-bottom:1px solid rgba(217,164,65,.3);
  transform:translateY(-102%);
  visibility:hidden;
  transition:transform .36s cubic-bezier(.22,.61,.36,1),visibility .36s;
}
.rail__nav[data-open]{
  transform:translateY(0);
  visibility:visible;
}
.rail__list{display:flex;flex-direction:column;gap:4px}
.rail__item{width:100%}
.rail__link{
  display:flex;
  align-items:center;
  gap:14px;
  width:100%;
  padding:13px 14px;
  border:1px solid transparent;
  border-radius:8px;
  color:rgba(248,244,236,.78);
  transition:color .18s ease,background-color .18s ease,border-color .18s ease;
}
.rail__idx{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--gold);
  opacity:.8;
}
.rail__label{
  font-family:var(--font-heading);
  font-size:17px;
  font-weight:600;
  letter-spacing:.08em;
}
.rail__link:hover{
  color:var(--paper);
  background:rgba(217,164,65,.1);
  border-color:rgba(217,164,65,.35);
}
.rail__link[aria-current="page"]{
  color:var(--paper);
  background:rgba(217,164,65,.16);
  border-color:rgba(217,164,65,.55);
}
.rail__link[aria-current="page"] .rail__idx{opacity:1;color:var(--gold)}
.rail__link[aria-current="page"] .rail__label{color:var(--paper)}
.rail__drawer-foot{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 16px;
  margin-top:26px;
  padding-top:18px;
  border-top:1px solid rgba(217,164,65,.25);
}
.rail__version{
  display:inline-block;
  padding:4px 10px;
  border:1px solid rgba(217,164,65,.5);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--gold);
  white-space:nowrap;
}
.rail__tagline{
  font-size:12.5px;
  letter-spacing:.08em;
  color:rgba(248,244,236,.62);
}
.rail__stamp{display:none}

.rail__progress{
  position:absolute;
  inset-inline:0;
  bottom:-1px;
  height:3px;
  background:rgba(248,244,236,.12);
  overflow:hidden;
  pointer-events:none;
}
.rail__progress-fill{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--vine),var(--gold));
  transform:scaleX(var(--p,0));
  transform-origin:left center;
  transition:transform .12s linear;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:72px;
  overflow:hidden;
  color:rgba(248,244,236,.82);
  background:radial-gradient(120% 90% at 12% 0%,#3A1548 0%,#2A1038 48%,#1B151D 100%);
  border-top:1px solid rgba(217,164,65,.3);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(115deg,rgba(217,164,65,.07) 0 1px,transparent 1px 34px);
}
.footer__inner{
  position:relative;
  z-index:1;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:48px var(--gutter) 0;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:36px;
}
.footer__masthead{min-width:0}
.footer__kicker{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.24em;
  color:var(--gold);
  text-transform:uppercase;
}
.footer__brand{
  margin-top:12px;
  font-family:var(--font-heading);
  font-size:clamp(24px,4vw,34px);
  font-weight:800;
  line-height:1.15;
  letter-spacing:.05em;
  color:var(--paper);
}
.footer__tagline{
  margin-top:12px;
  font-size:13.5px;
  letter-spacing:.1em;
  color:rgba(248,244,236,.66);
  max-width:34ch;
}
.footer__heading{
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:400;
  letter-spacing:.22em;
  color:rgba(248,244,236,.55);
  margin-bottom:16px;
}
.footer__list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:10px 20px;
}
.footer__link{
  display:inline-block;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  font-size:14.5px;
  color:rgba(248,244,236,.85);
  transition:color .18s ease,border-color .18s ease;
}
.footer__link:hover{color:var(--gold);border-color:rgba(217,164,65,.6)}
.contact-row{
  display:grid;
  grid-template-columns:44px minmax(0,1fr) auto;
  align-items:center;
  gap:10px;
  padding:9px 0;
  border-bottom:1px dashed rgba(217,164,65,.2);
}
.contact-row__key{
  font-size:11.5px;
  letter-spacing:.14em;
  color:rgba(248,244,236,.5);
}
.contact-row__val{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.copy-btn{
  padding:4px 11px;
  border:1px solid rgba(217,164,65,.5);
  border-radius:999px;
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--gold);
  white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.copy-btn:hover{background:var(--gold);color:var(--ink)}
.copy-btn[data-copied]{background:var(--vine);border-color:var(--vine);color:var(--paper)}
.footer__note{
  margin-top:14px;
  font-size:12.5px;
  line-height:1.7;
  color:rgba(248,244,236,.58);
}
.footer__address{
  margin-top:8px;
  font-size:12.5px;
  letter-spacing:.04em;
  color:rgba(248,244,236,.42);
}
.footer__base{
  position:relative;
  z-index:1;
  max-width:var(--maxw);
  margin:44px auto 0;
  padding:20px var(--gutter) 26px;
  border-top:1px solid rgba(248,244,236,.14);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 26px;
  font-size:12.5px;
  color:rgba(248,244,236,.55);
}
.footer__legal{font-family:var(--font-mono);letter-spacing:.06em}
.footer__update{letter-spacing:.04em}
.footer__copy{letter-spacing:.06em}

/* ---------- 通用组件 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.prose{max-width:68ch}
.prose p + p{margin-top:1.2em}
.prose a{color:var(--vine);border-bottom:1px solid rgba(30,107,90,.4)}
.prose a:hover{color:var(--violet);border-bottom-color:rgba(75,30,91,.5)}
.prose ul,.prose ol{margin-top:1em;padding-inline-start:1.1em;list-style:disc}
.prose li + li{margin-top:.4em}

.t-display{font-family:var(--font-heading);font-size:clamp(34px,5.6vw,66px);font-weight:900;line-height:1.1;letter-spacing:.01em}
.t-h2{font-family:var(--font-heading);font-size:clamp(26px,3.4vw,42px);font-weight:800;line-height:1.14}
.t-h3{font-family:var(--font-heading);font-size:clamp(19px,2vw,26px);font-weight:700;line-height:1.25}
.t-mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em}

.section{padding-block:clamp(44px,6vw,80px)}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:14px;
  margin-bottom:28px;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.24em;
  color:var(--wine);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor}

.grid{display:grid;gap:var(--gutter)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(228px,1fr))}

.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:22px;
  background:var(--paper);
  border:1px solid rgba(138,122,144,.28);
  border-radius:var(--radius);
  box-shadow:var(--shadow-card);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.card:hover{
  transform:translateY(-2px);
  border-color:rgba(30,107,90,.55);
  box-shadow:0 20px 36px -26px rgba(42,16,56,.62);
}
.card--mist{background:var(--mist);border-color:rgba(75,30,91,.16)}
.card__index{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;color:var(--wine)}
.card__title{font-family:var(--font-heading);font-size:20px;font-weight:700;line-height:1.3}
.card__meta{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--ash)}
.card__link::after{content:"";position:absolute;inset:0;border-radius:inherit}

.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  line-height:1.6;
}
.badge--version{color:#8a6516;background:rgba(217,164,65,.16)}
.badge--vine{color:var(--vine);background:rgba(30,107,90,.08)}
.badge--tag{color:var(--wine);background:rgba(140,47,74,.08)}

.band{
  position:relative;
  padding:clamp(28px,4vw,52px) var(--gutter);
  color:var(--paper);
}
.band__inner{max-width:var(--maxw);margin-inline:auto}
.band--violet{background:var(--violet)}
.band--indigo{background:var(--violet-deep)}
.band--wine{background:var(--wine)}
.band--vine{background:var(--vine)}
.band--gold{background:var(--gold);color:var(--ink)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:12px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:14.5px;
  font-weight:500;
  letter-spacing:.08em;
  line-height:1.4;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn--gold{background:var(--gold);color:var(--ink);box-shadow:0 10px 22px -16px rgba(217,164,65,.95)}
.btn--gold:hover{background:#e5b356}
.btn--violet{background:var(--violet);color:var(--paper)}
.btn--violet:hover{background:#5c2570}
.btn--ghost{border-color:rgba(75,30,91,.32);color:var(--violet);background:transparent}
.btn--ghost:hover{border-color:var(--vine);color:var(--vine);background:rgba(30,107,90,.06)}
.btn--onDark{border-color:rgba(248,244,236,.42);color:var(--paper)}
.btn--onDark:hover{border-color:var(--gold);color:var(--gold)}

.breadcrumb{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--ash);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:rgba(138,122,144,.55)}
.breadcrumb a:hover{color:var(--vine)}
.breadcrumb [aria-current="page"]{color:var(--violet)}

.panel{
  padding:20px;
  border:1px solid rgba(217,164,65,.26);
  border-radius:12px;
  background:var(--violet-deep);
  color:rgba(248,244,236,.9);
}
.panel__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-bottom:12px;
  border-bottom:1px solid rgba(248,244,236,.14);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:rgba(217,164,65,.92);
}
.panel__row{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:14px;
  padding:9px 0;
  border-bottom:1px dashed rgba(248,244,236,.12);
  font-size:14px;
}
.panel__row:last-child{border-bottom:0}
.panel__row span:first-child{color:rgba(248,244,236,.62);font-size:13px}

.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid rgba(138,122,144,.25);
  border-radius:var(--radius);
  background:linear-gradient(135deg,var(--mist),var(--celadon));
}
.media > img,
.media > picture > img{width:100%;height:100%;object-fit:cover}
.media--square{aspect-ratio:1}
.media--wide{aspect-ratio:21/9}
.media--portrait{aspect-ratio:4/5}
.media__fallback{
  position:absolute;
  inset:0;
  display:grid;
  place-items:center;
  padding:16px;
  text-align:center;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:rgba(75,30,91,.5);
  background:repeating-linear-gradient(135deg,rgba(75,30,91,.07) 0 1px,transparent 1px 18px);
}
.media__caption{
  margin-top:10px;
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--ash);
}
.vine-rule{
  height:1px;
  border:0;
  background:linear-gradient(90deg,transparent,rgba(138,122,144,.55),transparent);
}
.visually-hidden{
  position:absolute;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* ---------- 平板 ---------- */
@media (min-width:760px){
  :root{--gutter:32px}
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr));gap:40px}
  .footer__masthead{grid-column:1 / -1}
  .rail{padding:12px 24px}
}

@media (max-width:1023px){
  body.nav-open{overflow:hidden}
}

/* ---------- 桌面：左侧轨道 ---------- */
@media (min-width:1024px){
  body{padding-inline-start:var(--rail-w)}
  .site-header{
    position:fixed;
    inset-block:0;
    inset-inline-start:0;
    width:var(--rail-w);
    border-bottom:0;
    border-inline-end:1px solid rgba(217,164,65,.22);
    background:linear-gradient(180deg,#2A1038 0%,#3C1546 56%,#2A1038 100%);
  }
  .skip-link{inset-inline-start:calc(var(--rail-w) + 14px)}
  .rail{
    height:100%;
    min-height:0;
    flex-direction:column;
    align-items:center;
    justify-content:space-between;
    gap:0;
    padding:20px 0 16px;
  }
  .rail__brand{flex-direction:column;gap:16px}
  .rail__mark{width:18px;height:18px}
  .rail__brand-text{align-items:center}
  .rail__brand-name{
    writing-mode:vertical-rl;
    font-size:14px;
    letter-spacing:.26em;
  }
  .rail__brand-sub{display:none}
  .rail__toggle{display:none}
  .rail__nav{
    position:static;
    flex:1;
    display:flex;
    align-items:center;
    justify-content:center;
    width:100%;
    max-height:none;
    overflow:visible;
    padding:0;
    border:0;
    background:none;
    transform:none;
    visibility:visible;
  }
  .rail__list{width:100%;gap:2px}
  .rail__link{
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:3px;
    padding:11px 2px;
    border:0;
    border-radius:0;
    position:relative;
  }
  .rail__idx{font-size:9.5px;letter-spacing:.06em}
  .rail__label{font-size:12.5px;letter-spacing:.06em;line-height:1.3}
  .rail__link::before{
    content:"";
    position:absolute;
    inset-inline-start:0;
    top:50%;
    width:2px;
    height:0;
    background:var(--gold);
    transform:translateY(-50%);
    transition:height .22s ease;
  }
  .rail__link:hover,
  .rail__link[aria-current="page"]{background:rgba(217,164,65,.12);border:0}
  .rail__link[aria-current="page"]::before{height:72%}
  .rail__drawer-foot{display:none}
  .rail__stamp{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:6px;
  }
  .rail__stamp .rail__version{font-size:10px;padding:3px 7px;letter-spacing:.06em}
  .rail__stamp-year{
    font-family:var(--font-mono);
    font-size:9.5px;
    letter-spacing:.04em;
    color:rgba(248,244,236,.45);
  }
  .rail__progress{
    inset-inline:auto 0;
    top:0;
    bottom:0;
    width:3px;
    height:auto;
  }
  .rail__progress-fill{
    background:linear-gradient(180deg,var(--vine),var(--gold));
    transform:scaleY(var(--p,0));
    transform-origin:center top;
  }
  .footer__inner{
    grid-template-columns:1.35fr .9fr 1.15fr;
    gap:48px;
    padding-top:64px;
  }
  .footer__masthead{grid-column:auto}
}

@media (min-width:1200px){
  .footer__list{gap:11px 26px}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .rail__progress-fill{transition:none}
}