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

:root{
  --ink:#000;
  --paper:#fff;
  --hair:rgba(0,0,0,.16);
  --display:'Cormorant Garamond','Libre Baskerville',Georgia,'Songti SC',serif;
  --body:'Libre Baskerville',Georgia,'Songti SC','SimSun',serif;
}

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

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

body{
  margin:0;
  overflow-x:hidden;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body);
  font-size:17px;
  line-height:1.78;
}

img{max-width:100%}
a{color:inherit}

::selection{background:#000;color:#fff}

/* ---------- 页头 ---------- */

.site-head{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--paper);
  border-bottom:2px solid var(--ink);
}

.ticker{
  background:var(--ink);
  color:var(--paper);
  font-size:12px;
  letter-spacing:.34em;
  padding-left:.34em;
}

.ticker-track{
  position:relative;
  height:28px;
}

.ticker-item{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  opacity:0;
  transition:opacity .55s ease;
}

.ticker-item.is-on{opacity:1}

.masthead{
  display:flex;
  align-items:center;
  gap:.75rem 1rem;
  flex-wrap:wrap;
  padding:.55rem clamp(1rem,4vw,2.5rem);
}

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

.logo-mark{
  font-family:var(--display);
  font-size:1.65rem;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1;
}

.logo-img{
  display:block;
  height:34px;
  width:auto;
}

.pillnav{
  display:flex;
  gap:.45rem;
  margin-left:auto;
  flex-wrap:wrap;
}

.pill{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.35rem 1rem;
  border:1px solid var(--ink);
  border-radius:999px;
  font-size:16px;
  line-height:1.2;
  text-decoration:none;
  color:var(--ink);
  background:var(--paper);
  transition:background .2s ease,color .2s ease;
}

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

/* ---------- 版面 ---------- */

main{
  padding:clamp(1rem,3vw,2.5rem) clamp(1rem,4vw,2.5rem) 4rem;
}

.sheet{
  max-width:1240px;
  margin:0 auto;
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  column-gap:clamp(1.5rem,3vw,3rem);
  row-gap:0;
  align-items:start;
}

/* ---------- 头图 ---------- */

.hero{
  grid-column:1 / -1;
  position:relative;
  isolation:isolate;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:45vh;
  margin-bottom:clamp(1.5rem,4vw,2.6rem);
  padding:clamp(2rem,7vw,4.5rem) 1.4rem;
  border:1px solid var(--ink);
  border-radius:28px;
  background:var(--ink);
  color:var(--paper);
  text-align:center;
}

.hero-figure{
  position:absolute;
  inset:0;
  margin:0;
  z-index:0;
}

.hero-img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.55;
  filter:grayscale(1) contrast(1.08);
  will-change:transform;
}

.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background-image:radial-gradient(circle,rgba(255,255,255,.3) 1px,transparent 1.4px);
  background-size:14px 14px;
  opacity:.55;
}

.hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  background:linear-gradient(180deg,rgba(0,0,0,.42),rgba(0,0,0,.7));
}

.hero-inner{
  position:relative;
  z-index:3;
  max-width:46ch;
}

.hero-title{
  margin:0 0 .8rem;
  font-family:var(--display);
  font-weight:600;
  font-size:clamp(2rem,6.4vw,3.7rem);
  line-height:1.12;
  letter-spacing:.01em;
}

.hero-desc{
  margin:0;
  font-size:clamp(.95rem,2.2vw,1.06rem);
  line-height:1.72;
  opacity:.86;
}

/* ---------- 左侧栏 ---------- */

.rail{
  grid-column:1;
  grid-row:2 / span 500;
  align-self:start;
  position:sticky;
  top:126px;
  display:grid;
  gap:1rem;
}

.rail-block{
  border:1px solid var(--ink);
  border-radius:28px;
  padding:.9rem 1.05rem 1rem;
}

.rail-title{
  margin:0 0 .55rem;
  font-family:var(--display);
  font-size:.86rem;
  font-weight:700;
  letter-spacing:.3em;
  line-height:1.4;
}

.rail-title span{display:inline-block}

.rail-list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:.1rem;
}

.rail-list a{
  display:flex;
  align-items:baseline;
  gap:.55rem;
  min-height:34px;
  padding:.22rem 0;
  font-size:15px;
  line-height:1.45;
  text-decoration:none;
  border-bottom:1px solid var(--hair);
}

.rail-list li:last-child a{border-bottom:0}

.rail-list a:hover .rail-name{text-decoration:underline}

.rail-num{
  font-family:var(--display);
  font-size:.8rem;
  letter-spacing:.1em;
  opacity:.65;
}

.rail-brand{
  margin:0;
  font-family:var(--display);
  font-size:1.2rem;
  font-weight:600;
  line-height:1.3;
}

.rail-top{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  margin-top:.3rem;
  font-size:15px;
  text-decoration:none;
  border-bottom:1px solid var(--ink);
}

/* ---------- 正文 ---------- */

.sheet > div:not(.hero){
  grid-column:2;
  margin-bottom:2.8rem;
  padding-bottom:1.8rem;
  border-bottom:1px solid var(--hair);
}

.sheet > div:not(.hero):last-child{
  border-bottom:0;
  margin-bottom:0;
}

.sheet > div[id]{scroll-margin-top:150px}

.sheet > div h2{
  margin:0 0 1rem;
  font-family:var(--display);
  font-weight:600;
  font-size:clamp(1.5rem,3.4vw,2.05rem);
  line-height:1.22;
  letter-spacing:.01em;
}

.sheet > div h2 span{
  display:inline-block;
  padding-bottom:.12rem;
  border-bottom:3px solid var(--ink);
}

.sheet > div h3{
  margin:1.6rem 0 .6rem;
  font-family:var(--display);
  font-weight:600;
  font-size:1.32rem;
  line-height:1.3;
}

.sheet > div h3 span{display:inline-block}

.sheet > div p{margin:0 0 1.05rem}

.sheet > div ul,
.sheet > div ol{
  margin:0 0 1.15rem;
  padding-left:1.3rem;
}

.sheet > div li{margin:0 0 .4rem}

.sheet > div a{
  text-decoration:underline;
  text-underline-offset:3px;
}

.sheet > div blockquote{
  margin:1.5rem 0;
  padding:.35rem 0 .35rem 1.2rem;
  border-left:4px solid var(--ink);
  font-family:var(--display);
  font-size:1.26rem;
  line-height:1.55;
}

.sheet > div blockquote p{margin:0 0 .5rem}

.sheet > div figure{margin:1.5rem 0}

.sheet > div figcaption{
  margin-top:.5rem;
  font-size:14px;
  letter-spacing:.02em;
  opacity:.7;
}

.sheet > div img{
  display:block;
  width:100%;
  height:auto;
  border:1px solid var(--ink);
  border-radius:14px;
}

.sheet > div table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 1.2rem;
  font-size:16px;
}

.sheet > div th,
.sheet > div td{
  border:1px solid var(--ink);
  padding:.45rem .6rem;
  text-align:left;
  vertical-align:top;
}

.sheet > div hr{
  border:0;
  border-top:1px solid var(--ink);
  margin:1.6rem 0;
}

/* 首字下沉，仅第一段正文 */
.sheet > div:nth-of-type(2) > p:first-of-type::first-letter{
  float:left;
  padding:.14rem .5rem 0 0;
  font-family:var(--display);
  font-weight:700;
  font-size:4.1rem;
  line-height:.8;
}

/* ---------- 页脚 ---------- */

.site-foot{
  display:flex;
  align-items:center;
  gap:.6rem 1.2rem;
  flex-wrap:wrap;
  padding:.9rem clamp(1rem,4vw,2.5rem);
  border-top:2px solid var(--ink);
  background:var(--ink);
  color:var(--paper);
}

.foot-brand a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  font-family:var(--display);
  font-size:clamp(1.4rem,3.4vw,2.3rem);
  font-weight:700;
  letter-spacing:.04em;
  line-height:1;
  text-decoration:none;
  color:var(--paper);
}

.foot-nav{margin-left:auto}

.foot-list{
  display:flex;
  flex-wrap:wrap;
  gap:0 1rem;
  margin:0;
  padding:0;
  font-size:15px;
}

.foot-list dt,
.foot-list dd{margin:0}

.foot-list a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  text-decoration:none;
  color:var(--paper);
  border-bottom:1px solid transparent;
}

.foot-list a:hover{border-bottom-color:var(--paper)}

.foot-copy{
  font-size:13px;
  letter-spacing:.1em;
  opacity:.72;
}

/* ---------- 动效 ---------- */

.reveal{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s ease,transform .6s ease;
}

.reveal.is-in{
  opacity:1;
  transform:none;
}

/* ---------- 宽屏多栏 ---------- */

@media (min-width:1080px){
  .sheet > div:not(.hero){
    column-count:2;
    column-gap:2.6rem;
  }
  .sheet > div:not(.hero) > h2{column-span:all}
  .sheet > div:not(.hero) > h3,
  .sheet > div:not(.hero) > blockquote,
  .sheet > div:not(.hero) > figure,
  .sheet > div:not(.hero) > table{break-inside:avoid}
}

/* ---------- 窄屏 ---------- */

@media (max-width:900px){
  .site-head{position:static}
  .ticker{display:none}

  .masthead{padding:.6rem 1rem .1rem}

  .pillnav{
    margin-left:0;
    width:100%;
    flex-wrap:nowrap;
    overflow-x:auto;
    padding-bottom:.6rem;
    scrollbar-width:none;
  }

  .pillnav::-webkit-scrollbar{display:none}

  .pill{flex:0 0 auto}

  main{padding:1rem 1rem 3rem}

  .sheet{grid-template-columns:minmax(0,1fr)}

  .rail{
    grid-column:1;
    grid-row:auto;
    position:static;
    grid-template-columns:1fr 1fr;
    gap:.7rem;
    margin-bottom:1.8rem;
  }

  .rail-block{padding:.8rem .85rem .9rem;border-radius:20px}
  .rail-list a{font-size:14px}
  .rail-brand{font-size:1.05rem}

  .sheet > div:not(.hero){
    grid-column:1;
    margin-bottom:2.2rem;
    padding-bottom:1.4rem;
  }

  .sheet > div[id]{scroll-margin-top:16px}

  .hero{min-height:42vh;border-radius:20px}

  .site-foot{
    flex-direction:column;
    align-items:flex-start;
    gap:.3rem;
  }

  .foot-nav{margin-left:0;width:100%}
  .foot-list{gap:0 .9rem}
  .foot-copy{opacity:.65}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .ticker-item{transition:none}
  .pill{transition:none}
}

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