:root{
  --velvet:#B3124B;
  --velvet-deep:#7C0B34;
  --blush:#F3D9DC;
  --ivory:#FBF6F3;
  --ink:#14100F;
  --ink-soft:#4A3F41;
  --champagne:#C8A96A;
  --slate:#6E8091;
  --stone:#8C8A85;
  --clay:#A65A3E;
  --cocoa:#221B1C;
  --paper:#FFFFFF;
  --rail-w:240px;
  --bar-h:56px;
  --edge:32px;
  --wrap:1200px;
  --line:2px solid var(--ink);
  --shadow-hard:4px 4px 0 var(--ink);
  --shadow-hard-lg:6px 6px 0 var(--ink);
  --shadow-soft:0 22px 48px -30px rgba(20,16,15,.65);
  --font-display:"Playfair Display",Georgia,"Times New Roman","Songti SC","Noto Serif SC",serif;
  --font-body:"Inter","Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  padding-left:var(--rail-w);
  padding-bottom:var(--bar-h);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--ink);
  background-color:var(--ivory);
  background-image:
    radial-gradient(760px 420px at 6% -8%, rgba(179,18,75,.16), transparent 62%),
    radial-gradient(680px 400px at 96% 0%, rgba(200,169,106,.20), transparent 58%),
    repeating-linear-gradient(90deg, rgba(20,16,15,.035) 0 1px, transparent 1px 48px);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;letter-spacing:-.02em;line-height:1.18;margin:0 0 .5em;color:var(--ink)}
h1{font-size:clamp(2.25rem,4.4vw,4.5rem)}
h2{font-size:clamp(1.75rem,2.6vw,2.5rem)}
h3{font-size:clamp(1.25rem,1.6vw,1.5rem)}
p{margin:0 0 1.1em}
a{color:var(--velvet-deep);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--velvet)}
ul,ol{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--champagne);outline-offset:3px;border-radius:2px}
#main-content{scroll-margin-top:132px}
.mono{font-family:var(--font-mono);font-size:.86em;letter-spacing:.04em}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* skip link */
.skip-link{
  position:fixed;top:-80px;left:calc(var(--rail-w) + 16px);z-index:200;
  display:inline-block;padding:12px 20px;
  background:var(--ink);color:var(--champagne);
  border:2px solid var(--champagne);
  font-weight:700;font-size:14px;text-decoration:none;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:12px;color:var(--champagne)}

/* ============ 左侧品牌轨道 ============ */
.rail{
  position:fixed;z-index:50;top:0;left:0;bottom:var(--bar-h);
  width:var(--rail-w);
  display:flex;flex-direction:column;gap:18px;
  padding:26px 20px 20px;
  background:linear-gradient(175deg,var(--blush) 0%,#EFD0D4 56%,#E4C0C6 100%);
  border-right:var(--line);
  overflow-y:auto;
}
.rail::after{
  content:"";position:absolute;top:0;right:9px;bottom:0;width:1px;
  background:rgba(200,169,106,.8);pointer-events:none;
}
.rail-brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.rail-monogram{
  flex:none;width:40px;height:40px;display:grid;place-items:center;
  background:var(--velvet);color:var(--ivory);
  font-family:var(--font-display);font-size:20px;font-weight:700;
  border:var(--line);box-shadow:3px 3px 0 var(--ink);
}
.rail-brand-copy{display:block;min-width:0}
.rail-brand-name{display:block;font-family:var(--font-display);font-size:20px;font-weight:700;line-height:1.2;letter-spacing:-.01em}
.rail-brand-sub{display:block;font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--velvet-deep)}
.rail-note{
  margin:0;padding:10px 12px;
  font-size:13px;line-height:1.6;color:var(--ink-soft);
  background:rgba(255,255,255,.55);
  border-left:3px solid var(--champagne);
}
.rail-nav{display:block}
.rail-label{
  margin:0 0 6px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.2em;color:var(--velvet-deep);text-transform:uppercase;
}
.rail-list{display:flex;flex-direction:column;gap:2px;margin-top:6px}
.rail-link{
  display:block;padding:6px 10px;
  font-size:14px;font-weight:600;color:#2B2223;text-decoration:none;
  border-left:3px solid transparent;
  transition:background .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.rail-link:hover,.rail-link[aria-current="page"]{
  border-left-color:var(--velvet);
  background:rgba(255,255,255,.66);
  transform:translateX(2px);
  color:var(--velvet-deep);
}
.rail-foot{margin-top:auto;padding-top:14px;border-top:1px dashed rgba(124,11,52,.35)}
.rail-version{margin:0 0 10px;font-family:var(--font-mono);font-size:22px;letter-spacing:.04em;color:var(--velvet-deep)}
.rail-collect{
  display:block;margin-bottom:10px;padding:8px 10px;
  font-size:13px;font-weight:700;text-decoration:none;color:var(--ink);
  background:var(--paper);border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink);
  text-align:center;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease);
}
.rail-collect:hover{transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--ink);color:var(--velvet-deep)}
.rail-cta{
  display:block;padding:9px 10px;
  font-size:14px;font-weight:700;text-align:center;text-decoration:none;
  color:var(--ivory);background:var(--velvet);
  border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background .16s var(--ease);
}
.rail-cta:hover{background:var(--velvet-deep);color:var(--ivory);transform:translate(-2px,-2px);box-shadow:5px 5px 0 var(--ink)}

/* ============ 双层导航 ============ */
.topbar{position:sticky;top:0;z-index:40}
.topbar-top{
  display:flex;align-items:center;gap:20px;
  min-height:56px;padding:0 var(--edge);
  background:rgba(251,246,243,.95);
  backdrop-filter:blur(8px);
  border-bottom:1px solid rgba(200,169,106,.85);
  transition:height .2s var(--ease),min-height .2s var(--ease),opacity .2s var(--ease),padding .2s var(--ease);
}
.topbar-brand{
  display:none;align-items:center;gap:6px;
  font-family:var(--font-display);font-size:16px;font-weight:700;
  color:var(--ink);text-decoration:none;white-space:nowrap;
}
.topbar-dot{color:var(--velvet)}
.topbar-meta{
  display:flex;align-items:center;gap:10px;margin:0;
  font-size:13px;font-weight:500;color:var(--ink-soft);white-space:nowrap;
}
.topbar-version{
  padding:2px 8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--velvet-deep);background:var(--blush);
  border:1px solid var(--velvet-deep);
}
.topbar-tools{display:flex;align-items:center;gap:16px;margin-left:auto}
.tool-link{
  font-size:13px;font-weight:600;color:var(--ink);text-decoration:none;
  padding-bottom:2px;border-bottom:2px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.tool-link:hover{color:var(--velvet);border-bottom-color:var(--champagne)}
.tool-cta{
  display:inline-block;padding:6px 14px;
  font-size:13px;font-weight:700;color:var(--ivory);text-decoration:none;
  background:var(--velvet);border:2px solid var(--ink);box-shadow:2px 2px 0 var(--ink);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background .16s var(--ease);
}
.tool-cta:hover{background:var(--velvet-deep);color:var(--ivory);transform:translate(-1px,-1px);box-shadow:3px 3px 0 var(--ink)}
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 12px;
  font-family:var(--font-body);font-size:13px;font-weight:700;color:var(--ink);
  background:var(--paper);border:var(--line);box-shadow:2px 2px 0 var(--ink);
  cursor:pointer;
}
.nav-toggle:hover{background:var(--blush)}
.nav-toggle-bars{position:relative;display:inline-block;width:16px;height:2px;background:currentColor;transition:background .16s var(--ease)}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;
  transition:transform .16s var(--ease);
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle-text{letter-spacing:.08em}
.site-header[data-open] .nav-toggle-bars{background:transparent}
.site-header[data-open] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}
.topbar-nav{
  position:relative;
  background:rgba(251,246,243,.92);
  backdrop-filter:blur(8px);
  border-bottom:var(--line);
}
.nav-list{display:flex;align-items:stretch;gap:2px;padding:0 var(--edge)}
.nav-item{display:flex}
.nav-link{
  display:flex;align-items:center;
  padding:14px 14px;
  font-size:15px;font-weight:600;color:var(--ink);text-decoration:none;
  border-bottom:3px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease),background .16s var(--ease);
}
.nav-link:hover{color:var(--velvet);border-bottom-color:var(--champagne)}
.nav-link[aria-current="page"]{
  color:var(--velvet-deep);
  border-bottom-color:var(--velvet);
  background:linear-gradient(180deg,rgba(179,18,75,0),rgba(179,18,75,.10));
}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  background:var(--cocoa);
  color:#E8DCD6;
  border-top:2px solid var(--champagne);
  padding-top:52px;
}
.site-footer a{color:#E8DCD6}
.footer-main{
  max-width:var(--wrap);margin:0 auto;
  padding:0 var(--edge) 40px;
  display:grid;
  grid-template-columns:1.7fr 1fr 1fr 1.1fr 1.5fr;
  gap:32px;
}
.footer-brand{min-width:0}
.footer-mark{
  display:inline-block;
  font-family:var(--font-display);font-size:24px;font-weight:700;letter-spacing:-.01em;
  color:var(--champagne);text-decoration:none;
  padding-bottom:6px;border-bottom:2px solid var(--velvet);
}
.footer-mark:hover{color:var(--ivory)}
.footer-tagline{margin:14px 0 12px;font-size:14px;line-height:1.7;color:#B9AAA4;max-width:26em}
.footer-version{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--champagne)}
.footer-col{min-width:0}
.footer-heading{
  margin:0 0 12px;padding-bottom:8px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;letter-spacing:.2em;
  color:var(--champagne);text-transform:uppercase;
  border-bottom:1px dashed rgba(200,169,106,.4);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-item{display:block;font-size:14px;line-height:1.65;color:#B9AAA4}
.footer-count{display:inline-block;margin-left:6px;font-family:var(--font-mono);font-size:12px;color:var(--champagne);letter-spacing:.04em;word-break:break-all}
.footer-link{
  font-size:14px;font-weight:500;color:#E8DCD6;text-decoration:none;
  border-left:2px solid transparent;padding-left:0;
  transition:color .16s var(--ease),border-color .16s var(--ease),padding-left .16s var(--ease);
}
.footer-link:hover{color:var(--champagne);border-left-color:var(--champagne);padding-left:8px}
.footer-col--contact .footer-item{font-size:13px}
.footer-legal{
  max-width:var(--wrap);margin:0 auto;
  padding:16px var(--edge) 24px;
  display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:space-between;
  border-top:1px solid rgba(200,169,106,.28);
}
.footer-copy{margin:0;font-size:12px;color:#9C8F8A}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-legal-link{font-size:12px;color:#9C8F8A;text-decoration:none}
.footer-legal-link:hover{color:var(--champagne);text-decoration:underline}
.feedback-bar{
  position:fixed;left:var(--rail-w);right:0;bottom:0;z-index:60;
  min-height:var(--bar-h);
  display:flex;align-items:center;gap:18px;
  padding:8px var(--edge);
  background:var(--cocoa);
  border-top:2px solid var(--champagne);
  color:#F2E4DC;
}
.feedback-text{margin:0;font-size:13px;font-weight:500;color:#D9C9C2}
.feedback-cta{
  margin-left:auto;display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;
  font-size:13px;font-weight:700;color:var(--ink);text-decoration:none;
  background:var(--champagne);
  border:2px solid var(--ink);box-shadow:2px 2px 0 rgba(251,246,243,.9);
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background .16s var(--ease);
}
.feedback-cta:hover{background:#DBC084;color:var(--ink);transform:translate(-1px,-1px);box-shadow:3px 3px 0 rgba(251,246,243,.9)}
.feedback-arrow{font-family:var(--font-mono)}

/* ============ 通用布局与组件 ============ */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--edge)}
.page-main{max-width:var(--wrap);margin:0 auto;padding:40px var(--edge) 88px}
.breadcrumb{margin-bottom:24px}
.breadcrumb-list{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--stone)}
.breadcrumb-item{display:flex;align-items:center;gap:8px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--champagne)}
.breadcrumb-link{color:var(--ink-soft);text-decoration:none}
.breadcrumb-link:hover{color:var(--velvet);text-decoration:underline}
.eyebrow{
  display:inline-block;margin:0 0 14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--velvet-deep);
  padding-bottom:6px;border-bottom:2px solid var(--champagne);
}
.display{font-family:var(--font-display);font-weight:700;letter-spacing:-.02em;line-height:1.12}
.lede{font-size:18px;line-height:1.75;color:var(--ink-soft);max-width:38em}
.prose{font-size:17px;line-height:1.8;color:var(--ink)}
.prose p{margin:0 0 1.15em}
.prose h2{margin-top:1.6em}
.prose h3{margin-top:1.3em}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px;margin-bottom:20px;padding-bottom:12px;border-bottom:var(--line)}
.section-title{margin:0;font-size:clamp(1.5rem,2.2vw,2rem)}
.section-note{margin:0;margin-left:auto;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--stone)}
.rule{height:1px;border:0;margin:32px 0;background:linear-gradient(90deg,var(--champagne),rgba(200,169,106,0))}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 22px;
  font-family:var(--font-body);font-size:15px;font-weight:700;line-height:1.2;
  text-decoration:none;color:var(--ink);
  background:var(--paper);
  border:var(--line);box-shadow:var(--shadow-hard);
  cursor:pointer;
  transition:transform .16s var(--ease),box-shadow .16s var(--ease),background .16s var(--ease),color .16s var(--ease);
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:var(--shadow-hard-lg);color:var(--ink)}
.btn--primary{background:var(--velvet);color:var(--ivory)}
.btn--primary:hover{background:var(--velvet-deep);color:var(--ivory)}
.btn--ghost{background:transparent;border-color:var(--ink);box-shadow:none}
.btn--ghost:hover{background:var(--blush);box-shadow:var(--shadow-hard);color:var(--ink)}
.btn--dark{background:var(--cocoa);color:var(--champagne);border-color:var(--champagne);box-shadow:4px 4px 0 rgba(200,169,106,.55)}
.btn--dark:hover{color:var(--ivory);box-shadow:6px 6px 0 rgba(200,169,106,.6)}
.btn--sm{padding:8px 14px;font-size:13px;box-shadow:3px 3px 0 var(--ink)}
.surface{
  position:relative;
  padding:24px;
  background:var(--paper);
  border:var(--line);box-shadow:var(--shadow-hard);
}
.surface--blush{background:var(--blush)}
.surface--dark{background:var(--cocoa);color:#E8DCD6;border-color:var(--champagne);box-shadow:6px 6px 0 rgba(200,169,106,.5)}
.surface--dark h2,.surface--dark h3{color:var(--champagne)}
.surface-lift{transition:transform .16s var(--ease),box-shadow .16s var(--ease)}
.surface-lift:hover{transform:translate(-2px,-2px);box-shadow:var(--shadow-hard-lg)}
.tag{
  display:inline-block;padding:3px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--ink-soft);background:var(--ivory);
  border:1px solid var(--stone);
}
.tag--gold{color:var(--velvet-deep);background:rgba(200,169,106,.24);border-color:var(--champagne)}
.tag--slate{color:#3E4E5C;background:rgba(110,128,145,.16);border-color:var(--slate)}
.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.span-5{grid-column:span 5}
.span-7{grid-column:span 7}
.ledger{display:flex;flex-direction:column;border-top:1px solid rgba(20,16,15,.18)}
.ledger-row{display:flex;align-items:baseline;gap:16px;padding:11px 2px;border-bottom:1px solid rgba(20,16,15,.14)}
.ledger-key{margin:0;font-size:14px;font-weight:600;color:var(--ink)}
.ledger-val{margin:0;margin-left:auto;font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;color:var(--velvet-deep)}
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/10;
  border:var(--line);box-shadow:var(--shadow-hard);
  background:
    radial-gradient(120% 90% at 18% 8%, rgba(179,18,75,.24), transparent 58%),
    linear-gradient(145deg,#F3D9DC 0%,#E7C6CC 52%,#CDBBAE 100%);
}
.media-frame > img,
.media-frame > svg,
.media-frame > picture,
.media-frame > picture > img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(45deg,rgba(200,169,106,.14) 0 1px,transparent 1px 10px);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .2s var(--ease),transform .2s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (min-width:861px){
  .site-header[data-scrolled] .topbar-top{
    min-height:0;height:0;padding-top:0;padding-bottom:0;
    opacity:0;overflow:hidden;border-bottom-color:transparent;
  }
}
@media (max-width:1079px){
  :root{--rail-w:0px;--edge:24px}
  .rail{display:none}
  body{padding-left:0}
  .topbar-brand{display:inline-flex}
  .topbar-meta{display:none}
  .skip-link{left:16px}
  .footer-main{grid-template-columns:1.4fr 1fr 1fr;gap:28px}
  .footer-col--contact{grid-column:span 3}
  .feedback-bar{left:0}
}
@media (max-width:860px){
  :root{--edge:20px}
  .topbar-top{min-height:54px;gap:12px}
  .topbar-tools{gap:10px}
  .tool-link{display:none}
  .nav-toggle{display:inline-flex}
  .topbar-nav{border-bottom:none}
  .nav-list{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;gap:0;
    padding:10px 12px 16px;
    background:var(--ivory);
    border-bottom:var(--line);
    box-shadow:var(--shadow-hard);
  }
  .site-header[data-open] .nav-list{display:flex}
  .nav-item{display:block}
  .nav-link{
    padding:13px 12px;
    border-bottom:1px solid rgba(20,16,15,.12);
    border-left:3px solid transparent;
  }
  .nav-link[aria-current="page"]{
    border-left-color:var(--velvet);
    border-bottom-color:rgba(20,16,15,.12);
    background:rgba(179,18,75,.08);
  }
  .page-main{padding-top:32px;padding-bottom:64px}
  .grid,.grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .span-5,.span-7{grid-column:auto}
  .footer-main{grid-template-columns:1fr 1fr;gap:26px}
  .footer-col--contact{grid-column:span 2}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .feedback-text{font-size:12px}
  .feedback-cta{padding:7px 12px;font-size:12px}
  .lede{font-size:17px}
}
@media (max-width:560px){
  .footer-main{grid-template-columns:1fr}
  .footer-col--contact{grid-column:auto}
  .feedback-text{display:none}
  .feedback-cta{margin-left:0}
  .section-note{margin-left:0}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .surface-lift:hover,.btn:hover,.tool-cta:hover,.rail-cta:hover,.rail-collect:hover,.feedback-cta:hover{transform:none}
}