@import url('https://fonts.googleapis.com/css2?family=Cormorant+Infant:wght@300;400;500;600;700&family=Great+Vibes&display=swap');

:root{
  --ink:#000000;
  --paper:#ffffff;
  --hair:#d9d9d9;
  --soft:#e8e8e8;
  --mute:#3a3a3a;
  --serif:'Cormorant Infant','Songti SC','Noto Serif SC',Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font:400 17px/1.78 var(--sans);
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.22;letter-spacing:.01em}
p{margin:0 0 1rem}
a{color:inherit}
img{max-width:100%}
svg{display:block}

hr{
  border:0;
  border-top:1px solid var(--ink);
  width:56px;
  margin:1rem 0 1.6rem;
}

::selection{background:var(--ink);color:var(--paper)}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.hero :focus-visible,.cta :focus-visible,.masthead :focus-visible{outline-color:currentColor}

/* 顶部 品牌行 + 菜单行 */
.masthead{
  position:static;
  z-index:40;
  background:var(--paper);
  border-bottom:1px solid var(--ink);
}

.brandrow{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.9rem;
  padding:.85rem 1.25rem;
  border-bottom:1px solid var(--hair);
}

.signature{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  min-height:44px;
  text-decoration:none;
  color:var(--ink);
}

.seal{
  width:34px;
  height:34px;
  display:grid;
  place-items:center;
  border-radius:4px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--serif);
  font-size:19px;
  line-height:1;
}

.wordmark{
  font-family:var(--serif);
  font-size:26px;
  letter-spacing:.03em;
  white-space:nowrap;
}

.contact{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  min-height:44px;
  padding:.35rem .9rem;
  border:1px solid var(--ink);
  border-radius:4px;
  text-decoration:none;
  font-size:16px;
  transition:background .22s ease,color .22s ease;
}

.contact:hover,.contact:focus-visible{background:var(--ink);color:var(--paper)}

.menu{padding:0 .65rem}
.menu ol{
  display:flex;
  flex-wrap:wrap;
  gap:0 .15rem;
  margin:0;
  padding:0;
  list-style:none;
}

.menu li{display:flex}
.menu a{
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  min-height:46px;
  padding:.5rem .7rem;
  font-size:16px;
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:border-color .22s ease,background .22s ease;
}

.menu a:hover,.menu a:focus-visible{border-bottom-color:var(--ink);background:#f4f4f4}
.num{font-family:var(--serif);font-size:13px;letter-spacing:.08em;color:var(--mute)}

/* 首屏 */
.hero{
  position:relative;
  display:grid;
  place-items:center;
  min-height:60vh;
  overflow:hidden;
  background:var(--ink);
  color:var(--paper);
}

.hero::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:radial-gradient(rgba(255,255,255,.55) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.32;
  pointer-events:none;
}

.hero-frame{position:absolute;inset:0;overflow:hidden}
.hero-frame img{
  position:absolute;
  top:-10%;
  left:0;
  width:100%;
  height:120%;
  object-fit:cover;
  opacity:.45;
  filter:grayscale(1);
  will-change:transform;
}

.hero-copy{
  position:relative;
  z-index:1;
  max-width:52rem;
  padding:3.2rem 1.25rem;
  text-align:center;
}

.hero h1{margin:0;font-size:clamp(2.05rem,5.6vw,4.1rem);color:var(--paper)}
.hero-desc{margin:1.1rem auto 0;max-width:34rem;font-size:16px;color:var(--soft)}
.hero-cta{margin:1.9rem 0 0}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:.6rem 2rem;
  border:1px solid var(--paper);
  border-radius:4px;
  color:var(--paper);
  font-size:16px;
  text-decoration:none;
  transition:background .22s ease,color .22s ease;
}

.btn:hover,.btn:focus-visible{background:var(--paper);color:var(--ink)}

/* 正文骨架 */
.wrap{
  max-width:1200px;
  margin:0 auto;
  padding:2.4rem 1.25rem 3.2rem;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:2.4rem;
}

.col-main{min-width:0}

.prose{font-size:17px}
.prose article{
  padding:2.1rem 0 2.5rem;
  border-bottom:1px solid var(--hair);
  scroll-margin-top:1.2rem;
}
.prose article:first-child{padding-top:.2rem}
.prose article:last-child{border-bottom:0;padding-bottom:.6rem}

.prose h2{font-size:clamp(1.45rem,3.2vw,2rem);margin:0 0 .35rem}
.prose h3{font-size:1.18rem;font-family:var(--sans);font-weight:600;margin:1.7rem 0 .3rem}
.prose p{margin:0 0 1.05rem;color:var(--mute)}
.prose ul,.prose ol{pargin:0}
.prose ul,.prose ol{margin:0 0 1.1rem;padding-left:1.35rem;color:var(--mute)}
.prose li{margin:.4rem 0}
.prose li::marker{color:var(--ink)}
.prose a{text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--ink)}
.prose blockquote{
  margin:1.4rem 0;
  padding:.25rem 0 .25rem 1.15rem;
  border-left:3px solid var(--ink);
  font-family:var(--serif);
  font-size:1.16rem;
  color:var(--ink);
}
.prose figure{margin:1.4rem 0}
.prose img{border-radius:4px;display:block}
.prose table{width:100%;border-collapse:collapse;margin:1.2rem 0;font-size:16px}
.prose th,.prose td{border-bottom:1px solid var(--hair);padding:.6rem .5rem;text-align:left}

/* 侧栏 */
.rail{
  padding-top:1.6rem;
  border-top:1px solid var(--ink);
}
.rail h2{font-size:1.32rem;margin:0 0 .3rem}
.rail ol{list-style:none;margin:0;padding:0}
.rail li+li{border-top:1px solid var(--hair)}
.rail a{
  display:flex;
  align-items:center;
  min-height:44px;
  font-size:16px;
  text-decoration:none;
  color:var(--mute);
  transition:color .2s ease;
}
.rail a:hover,.rail a:focus-visible{color:var(--ink);text-decoration:underline}

/* 页脚 */
.board{
  margin-top:1.5rem;
  border-top:1px solid var(--ink);
}

.cta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:1.4rem;
  padding:3rem 1.25rem;
  background:var(--ink);
  color:var(--paper);
}

.cta-word{
  margin:0;
  font-family:var(--serif);
  font-size:clamp(1.85rem,5vw,3.1rem);
  line-height:1.15;
}

.cta-link{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:.55rem 1.9rem;
  border:1px solid var(--paper);
  border-radius:4px;
  color:var(--paper);
  font-size:16px;
  text-decoration:none;
  transition:background .22s ease,color .22s ease;
}
.cta-link:hover,.cta-link:focus-visible{background:var(--paper);color:var(--ink)}

.cols{
  max-width:1200px;
  margin:0 auto;
  padding:2.8rem 1.25rem;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:2.2rem;
}

.brandbig{font-family:var(--serif);font-size:1.6rem;margin:0 0 .55rem}
.branddesc{margin:0;max-width:34rem;color:var(--mute);font-size:16px}

.col-nav h2{font-size:1.22rem;margin:0 0 .25rem}
.col-nav ol{
  list-style:none;
  margin:0;
  padding:0;
  columns:2;
  column-gap:1.5rem;
}
.col-nav li{break-inside:avoid}
.col-nav a{
  display:flex;
  align-items:center;
  min-height:42px;
  font-size:16px;
  text-decoration:none;
  color:var(--mute);
}
.col-nav a:hover,.col-nav a:focus-visible{color:var(--ink);text-decoration:underline}

.bar{
  max-width:1200px;
  margin:0 auto;
  padding:1rem 1.25rem 2rem;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem;
  border-top:1px solid var(--hair);
  font-size:16px;
}

.copy{margin:0;color:var(--mute)}
.to-top{display:inline-flex;align-items:center;min-height:44px;text-decoration:none;color:var(--mute)}
.to-top:hover{color:var(--ink);text-decoration:underline}

/* 动效 */
.js .stag{opacity:0;transform:translateY(15px)}
.js .stag.on{
  opacity:1;
  transform:none;
  transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.3,1);
}

@media (min-width:700px){
  .hero{min-height:70vh}
}

@media (min-width:760px){
  .cols{grid-template-columns:1.1fr 1fr;gap:3.5rem}
}

@media (min-width:981px){
  .masthead{position:sticky;top:0}
  .brandrow{padding:.9rem 1.5rem}
  .menu{padding:0 .85rem}
  .wrap{
    grid-template-columns:minmax(0,1fr) 15.5rem;
    gap:3.5rem;
    padding:3.8rem 1.5rem 4.5rem;
  }
  .rail{
    padding:0 0 0 1.75rem;
    border-top:0;
    border-left:1px solid var(--hair);
    position:sticky;
    top:8.6rem;
    align-self:start;
  }
  .prose article{scroll-margin-top:9.5rem}
  .cta{padding:3.6rem 1.5rem}
  .bar{padding:1rem 1.5rem 2.4rem}
}

@media (max-width:420px){
  .menu a{padding:.5rem .55rem}
  .hero-copy{padding:2.6rem 1rem}
  .col-nav ol{columns:1}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .stag{opacity:1;transform:none;transition:none}
  .hero-frame img{will-change:auto}
}

button[aria-expanded]{min-width:44px;min-height:44px}