/* ==========================================================================
   register-lafei.com.cn — 共享站点样式表 /assets/site.css
   展册式布局 · 深窖黑与拉菲酒红 · 1px 精密网格 · 零圆角
   ========================================================================== */

/* ---------- 01 变量 ---------- */
:root{
  --ink:#0E0B0C;
  --night:#1A0F14;
  --wine-band:#2A1119;
  --lafite:#7B1E2B;
  --lafite-bright:#A8263A;
  --gold:#C9A227;
  --gold-light:#E8C86A;
  --warm-white:#F5F2ED;
  --mist:#8FA3B8;
  --warm-gray:#B9B3AC;

  --fs-12:12px;
  --fs-14:14px;
  --fs-16:16px;
  --fs-18:18px;
  --fs-24:24px;
  --fs-32:32px;
  --fs-48:48px;
  --fs-72:72px;
  --fs-120:120px;

  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Consolas,"Courier New",monospace;

  --hair:1px solid rgba(185,179,172,.22);
  --hair-strong:1px solid rgba(185,179,172,.42);
  --hair-faint:1px solid rgba(185,179,172,.14);

  --gutter:40px;
  --maxw:1440px;
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ---------- 02 重置 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background-color:var(--night);
  color:var(--warm-white);
  font-family:var(--sans);
  font-size:var(--fs-16);
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg{max-width:100%;display:block;}
a{color:inherit;}
button{font:inherit;color:inherit;}
main{display:block;}
::selection{background:var(--lafite);color:var(--warm-white);}

:focus-visible{outline:2px solid var(--gold);outline-offset:3px;}

/* ---------- 03 排版基元 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.band{padding-block:120px;}
.band--ink{background:var(--ink);}
.band--wine{background:var(--wine-band);}
.band--grid{
  background-image:linear-gradient(to right,rgba(185,179,172,.06) 1px,transparent 1px);
  background-size:96px 100%;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:12px;
  font-family:var(--mono);
  font-size:var(--fs-12);
  line-height:1.4;
  letter-spacing:.24em;
  color:var(--gold);
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--gold);flex:none;}

.section-title{
  font-family:var(--serif);
  font-weight:800;
  font-size:clamp(32px,5.2vw,72px);
  line-height:1.12;
  letter-spacing:-.02em;
  color:var(--warm-white);
}

.lede{
  font-size:var(--fs-18);
  line-height:1.85;
  color:var(--warm-gray);
  max-width:42em;
}

.prose{font-size:var(--fs-16);}
.prose p{max-width:42em;color:var(--warm-gray);}
.prose p + p{margin-top:24px;}
.prose h2,.prose h3{
  font-family:var(--serif);
  color:var(--warm-white);
  letter-spacing:-.01em;
  margin-top:64px;
  margin-bottom:16px;
}
.prose h2{font-size:var(--fs-32);line-height:1.3;}
.prose h3{font-size:var(--fs-24);line-height:1.4;}
.prose ul{margin-top:16px;}
.prose li{
  color:var(--warm-gray);
  padding-left:24px;
  position:relative;
  max-width:42em;
}
.prose li + li{margin-top:8px;}
.prose li::before{
  content:"";
  position:absolute;
  left:0;top:.9em;
  width:8px;height:1px;
  background:var(--gold);
}

.mono{
  font-family:var(--mono);
  font-size:var(--fs-14);
  letter-spacing:.08em;
  color:var(--warm-gray);
}
.note{
  font-family:var(--mono);
  font-size:var(--fs-12);
  line-height:1.7;
  letter-spacing:.08em;
  color:var(--warm-gray);
}

.rail-note{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.28em;
  color:var(--warm-gray);
  line-height:1;
}

.rule{
  height:1px;
  border:0;
  background:rgba(185,179,172,.22);
  margin:0;
}

/* ---------- 04 栅格 ---------- */
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:24px;
}

/* ---------- 05 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:12px;
  padding:16px 32px;
  border:1px solid transparent;
  border-radius:0;
  font-family:var(--mono);
  font-size:var(--fs-14);
  letter-spacing:.14em;
  line-height:1.4;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .3s var(--ease),color .3s var(--ease),border-color .3s var(--ease);
}
.btn--primary{
  background:var(--lafite);
  color:var(--warm-white);
  border-color:var(--lafite);
}
.btn--primary:hover{background:var(--lafite-bright);border-color:var(--lafite-bright);}
.btn--ghost{
  background:transparent;
  color:var(--warm-white);
  border-color:rgba(185,179,172,.42);
}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold-light);}
.btn--sm{padding:10px 18px;font-size:var(--fs-12);}

/* ---------- 06 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px;
  padding:24px 0;
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.12em;
  color:var(--warm-gray);
}
.breadcrumb a{color:var(--mist);text-decoration:none;transition:color .3s var(--ease);}
.breadcrumb a:hover{color:var(--gold-light);}
.breadcrumb-sep{color:rgba(185,179,172,.5);}

/* ---------- 07 图片容器 ---------- */
.figure{
  position:relative;
  display:block;
  width:100%;
  margin:0;
  overflow:hidden;
  border-radius:0;
  background:linear-gradient(140deg,#2A1119 0%,#1A0F14 55%,#0E0B0C 100%);
}
.figure img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure--21x9{aspect-ratio:21 / 9;}
.figure--16x9{aspect-ratio:16 / 9;}
.figure--4x3{aspect-ratio:4 / 3;}
.figure--1x1{aspect-ratio:1 / 1;}
.figure--grid::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(245,242,237,.07) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(245,242,237,.07) 1px,transparent 1px);
  background-size:40px 40px;
}
.figure-caption{
  margin-top:12px;
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.1em;
  color:var(--warm-gray);
}

/* ---------- 08 滚动显现 ---------- */
[data-reveal]{transition:opacity .6s var(--ease),transform .6s var(--ease);}
.js [data-reveal]{opacity:0;transform:translateY(18px);}
.js [data-reveal].is-revealed{opacity:1;transform:none;}

/* ---------- 09 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-100px;
  z-index:200;
  padding:12px 24px;
  background:var(--lafite);
  color:var(--warm-white);
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.12em;
  text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:16px;}

/* ---------- 10 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(20,11,16,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:var(--hair);
}
.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:1px;
  pointer-events:none;
  background:rgba(185,179,172,.16);
}
.scroll-progress span{
  display:block;
  width:0;
  height:1px;
  background:var(--lafite-bright);
}

.header-inner{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:16px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}

.brand-mark{
  display:inline-flex;
  align-items:center;
  gap:14px;
  text-decoration:none;
  color:var(--warm-white);
  flex:none;
}
.brand-tick{
  display:block;
  width:6px;
  height:36px;
  background:var(--lafite);
  flex:none;
}
.brand-text{display:flex;flex-direction:column;}
.brand-primary{
  font-family:var(--serif);
  font-weight:700;
  font-size:var(--fs-24);
  line-height:1.1;
  letter-spacing:.06em;
  color:var(--warm-white);
}
.brand-secondary{
  font-family:var(--mono);
  font-size:var(--fs-12);
  line-height:1.6;
  letter-spacing:.14em;
  color:var(--warm-gray);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:12px;
  padding:10px 14px;
  background:transparent;
  border:var(--hair-strong);
  border-radius:0;
  cursor:pointer;
  transition:border-color .3s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);}
.nav-toggle-label{
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  color:var(--warm-white);
}
.nav-toggle-bands{
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  width:18px;
  height:11px;
  flex:none;
}
.nav-toggle-bands i{
  display:block;
  height:1px;
  width:100%;
  background:var(--lafite-bright);
  transition:transform .3s var(--ease),opacity .3s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bands i:first-child{transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bands i:last-child{transform:translateY(-5px) rotate(-45deg);}

.site-nav{
  display:flex;
  align-items:center;
  gap:40px;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:24px;
}
.nav-item > a{
  position:relative;
  display:flex;
  align-items:baseline;
  gap:8px;
  padding:8px 2px;
  text-decoration:none;
  font-size:var(--fs-14);
  line-height:1.6;
  color:var(--warm-gray);
  transition:color .3s var(--ease);
}
.nav-item > a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:1px;
  background:var(--lafite);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .3s var(--ease);
}
.nav-item > a:hover::after,
.nav-item > a:focus-visible::after{transform:scaleX(1);}
.nav-item > a:hover{color:var(--warm-white);}
.nav-index{
  font-family:var(--mono);
  font-size:var(--fs-12);
  line-height:1.6;
  letter-spacing:.08em;
  color:var(--warm-gray);
  transition:color .3s var(--ease),background-color .3s var(--ease);
}
.nav-item > a:hover .nav-index{color:var(--gold);}
.nav-item > a[aria-current="page"]{color:var(--warm-white);}
.nav-item > a[aria-current="page"] .nav-index{
  background:var(--lafite);
  color:var(--warm-white);
  padding:1px 6px;
}
.nav-cta{display:flex;align-items:center;}

/* ---------- 11 页脚 ---------- */
.site-footer{
  background:var(--ink);
  border-top:var(--hair);
  padding:64px 0 32px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.2fr 1.1fr;
}
.footer-col{padding:8px 40px;}
.footer-col:first-child{padding-left:0;}
.footer-col:last-child{padding-right:0;}
.footer-col + .footer-col{border-left:var(--hair-faint);}

.footer-brand{
  font-family:var(--serif);
  font-weight:700;
  font-size:var(--fs-24);
  line-height:1.2;
  letter-spacing:.06em;
  color:var(--warm-white);
}
.footer-brand-sub{
  margin-top:4px;
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.14em;
  color:var(--warm-gray);
}
.footer-note{
  margin-top:16px;
  font-family:var(--mono);
  font-size:var(--fs-12);
  line-height:1.9;
  letter-spacing:.08em;
  color:rgba(185,179,172,.7);
}

.footer-title{
  font-family:var(--mono);
  font-size:var(--fs-12);
  font-weight:400;
  letter-spacing:.24em;
  color:var(--gold);
  line-height:1.6;
}

.footer-links{
  margin-top:16px;
  display:flex;
  flex-direction:column;
  gap:8px;
}
.footer-links a{
  font-size:var(--fs-14);
  line-height:1.7;
  color:var(--warm-gray);
  text-decoration:none;
  transition:color .3s var(--ease);
}
.footer-links a:hover{color:var(--gold-light);}

.footer-lines{
  margin-top:16px;
  display:flex;
  flex-direction:column;
  gap:10px;
  font-size:var(--fs-14);
  line-height:1.8;
  color:var(--warm-gray);
}
.footer-key{
  display:block;
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.12em;
  color:rgba(185,179,172,.65);
}

.footer-base{
  margin-top:64px;
  padding-top:24px;
  border-top:var(--hair);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  font-family:var(--mono);
  font-size:var(--fs-12);
  letter-spacing:.1em;
  color:var(--warm-gray);
}
.footer-copy{margin:0;}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:24px;
}
.footer-legal a{
  color:var(--mist);
  text-decoration:none;
  transition:color .3s var(--ease);
}
.footer-legal a:hover{color:var(--gold-light);}

/* ---------- 12 响应式 ---------- */
@media (max-width:1100px){
  :root{--gutter:32px;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:40px 0;}
  .footer-col{padding:0 32px;}
  .footer-col + .footer-col{border-left:var(--hair-faint);}
  .footer-col:nth-child(odd){padding-left:0;border-left:0;}
  .footer-col:nth-child(even){padding-right:0;}
}

@media (max-width:900px){
  :root{--gutter:24px;}
  .band{padding-block:64px;}

  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));gap:16px;}

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

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:0 var(--gutter);
    background:var(--wine-band);
    border-top:var(--hair);
    border-bottom:var(--hair);
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    transition:max-height .35s var(--ease),visibility .35s var(--ease);
  }
  .site-nav[data-open]{
    max-height:calc(100vh - 76px);
    overflow-y:auto;
    visibility:visible;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-item > a{
    padding:18px 0;
    font-size:var(--fs-16);
    border-bottom:var(--hair-faint);
    justify-content:flex-start;
  }
  .nav-item:last-child > a{border-bottom:0;}
  .nav-item > a::after{display:none;}
  .nav-cta{padding:24px 0 32px;}
  .nav-cta .btn{width:100%;}

  .footer-base{margin-top:40px;}
}

@media (max-width:640px){
  :root{--gutter:20px;}
  .band{padding-block:40px;}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:1fr;gap:0;}
  .footer-col,
  .footer-col:nth-child(odd),
  .footer-col:nth-child(even){
    padding:24px 0 0;
    border-left:0;
    border-top:var(--hair-faint);
  }
  .footer-col:first-child{padding-top:0;border-top:0;}
  .footer-legal{gap:16px;}
}

/* ---------- 13 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    transition-duration:.001ms !important;
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
  }
  .js [data-reveal]{opacity:1 !important;transform:none !important;}
  .scroll-progress span{transition:none !important;}
}