:root{
  --ink:#000000;
  --paper:#ffffff;
  --rule:rgba(0,0,0,.16);
  --r:18px;
  --shadow:0 22px 60px -28px rgba(0,0,0,.5);
  --pad:6vw;
  --wide:1380px;
}
*,*::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-family:'DM Sans',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  font-size:17px;
  line-height:1.7;
  letter-spacing:.005em;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
p{margin:0 0 1.1rem}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px}
.foot :focus-visible{outline-color:var(--paper)}
main{display:block}

/* ---------- 头部：品牌独占一行 + 菜单行 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--paper);
  border-bottom:1px solid var(--ink);
  padding:1rem var(--pad) .9rem;
}
.brandline{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.brand{
  display:inline-flex;
  align-items:center;
  gap:.65rem;
  min-height:44px;
  text-decoration:none;
  font-weight:700;
  font-size:clamp(1.15rem,2.6vw,1.6rem);
  letter-spacing:-.035em;
}
.brand .mark{width:34px;height:34px;border-radius:50%;object-fit:cover}
.toolbar{display:flex;align-items:center;gap:.7rem;margin-top:.75rem}

.drawer{flex:0 0 auto}
.drawer summary{
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 1.2rem;
  border:1px solid var(--ink);
  border-radius:999px;
  font-size:1rem;
  font-weight:500;
  letter-spacing:.08em;
  position:relative;
  z-index:120;
}
.drawer summary::-webkit-details-marker{display:none}
.drawer[open] summary{background:var(--ink);color:var(--paper)}
.drawer-list{
  position:fixed;
  inset:0;
  z-index:110;
  margin:0;
  padding:8rem var(--pad) 3rem;
  list-style:none;
  background:var(--paper);
  overflow:auto;
  display:grid;
  align-content:start;
}
.drawer-list li{border-bottom:1px solid var(--rule)}
.drawer-list a{
  display:block;
  padding:.8rem 0;
  min-height:56px;
  text-decoration:none;
  font-weight:700;
  font-size:clamp(1.6rem,6vw,3.2rem);
  line-height:1.2;
  letter-spacing:-.04em;
  transition:transform .22s ease,opacity .22s ease;
}
.drawer-list a:hover{transform:translateX(.7rem)}

.find{flex:1 1 auto;max-width:26rem}
.find input{
  width:100%;
  min-height:44px;
  padding:.5rem 1.1rem;
  border:1px solid var(--ink);
  border-radius:999px;
  background:var(--paper);
  color:var(--ink);
  font:inherit;
  font-size:1rem;
}
.find input::placeholder{color:rgba(0,0,0,.55)}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  min-height:70vh;
  display:flex;
  align-items:flex-end;
  background:var(--ink);
  color:var(--paper);
  overflow:hidden;
}
.hero-fig{margin:0;position:absolute;inset:0}
.hero-fig img{width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.06)}
.hero-shade{
  position:absolute;
  inset:0;
  background:linear-gradient(to top,rgba(0,0,0,.85) 0%,rgba(0,0,0,.34) 52%,rgba(0,0,0,.06) 100%);
}
.hero-copy{position:relative;z-index:2;width:100%;padding:3rem var(--pad) 3.2rem;text-align:right}
.hero h1{
  margin:0;
  font-size:clamp(3rem,10vw,12rem);
  line-height:.9;
  font-weight:700;
  letter-spacing:-.055em;
  text-wrap:balance;
}

/* ---------- 正文 + 右侧栏 ---------- */
.paper{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:3.5rem;
  max-width:var(--wide);
  margin:0 auto;
  padding:clamp(3.5rem,8vw,8rem) var(--pad);
}
@media (min-width:900px){
  .paper{grid-template-columns:minmax(0,1fr) 19rem;gap:clamp(3rem,6vw,6rem)}
}

.article{max-width:66ch;min-width:0}
.article section[id]{
  scroll-margin-top:8.5rem;
  padding-block:clamp(2.6rem,5vw,4.6rem);
  border-top:1px solid var(--rule);
}
.article section[id]:first-child{border-top:0;padding-top:0}
.article h2{
  margin:0 0 1rem;
  font-size:clamp(1.9rem,5vw,3.5rem);
  line-height:1.03;
  font-weight:700;
  letter-spacing:-.045em;
}
.article h2 + p,
.subtitle{
  margin:0 0 1.6rem;
  font-size:clamp(1.1rem,1.9vw,1.35rem);
  line-height:1.5;
  font-weight:500;
}
.article h3{
  margin:2.2rem 0 .6rem;
  font-size:1.35rem;
  line-height:1.3;
  letter-spacing:-.02em;
}
.article p{font-size:1.05rem;margin:0 0 1.15rem}
.article ul,.article ol{margin:0 0 1.3rem;padding-left:1.25rem}
.article li{margin-bottom:.55rem;font-size:1.05rem}
.article a{text-decoration:underline;text-underline-offset:.24em;text-decoration-thickness:1px}
.article figure{
  margin:2rem 0;
  border-radius:var(--r);
  overflow:hidden;
  background:#f3f3f3;
  box-shadow:var(--shadow);
}
.article figure img{border-radius:0}
.article img{border-radius:var(--r)}
.article blockquote{
  margin:2rem 0;
  padding:1.1rem 0 1.1rem 1.3rem;
  border-left:3px solid var(--ink);
  font-size:1.15rem;
  line-height:1.6;
}
.article table{width:100%;border-collapse:collapse;margin:1.6rem 0;font-size:1rem}
.article th,.article td{border-bottom:1px solid var(--rule);padding:.7rem .5rem;text-align:left;vertical-align:top}

.rail{
  align-self:start;
  background:#fff;
  border-radius:var(--r);
  box-shadow:var(--shadow);
  padding:1.6rem 1.35rem 1.3rem;
}
@media (min-width:900px){
  .rail{position:sticky;top:8.5rem}
}
.rail h2{margin:0 0 .3rem;font-size:1.3rem;line-height:1.25;letter-spacing:-.03em;font-weight:700}
.rail .subtitle{margin:0 0 1.3rem;font-size:1rem;line-height:1.55;font-weight:400}
.rail-list{list-style:none;margin:0;padding:0}
.rail-list li{border-top:1px solid var(--rule)}
.rail-list a{
  display:block;
  padding:.65rem 0;
  min-height:44px;
  text-decoration:none;
  font-size:1rem;
  font-weight:500;
  transition:transform .2s ease,opacity .2s ease;
}
.rail-list a:hover{transform:translateX(.35rem)}

/* ---------- 页脚：三栏 ---------- */
.foot{
  background:var(--ink);
  color:var(--paper);
  margin-top:clamp(2.5rem,8vw,7rem);
  padding:clamp(3rem,7vw,5.5rem) var(--pad) 2.2rem;
  display:grid;
  grid-template-columns:1fr;
  gap:2.4rem;
}
@media (min-width:820px){
  .foot{grid-template-columns:1.5fr .9fr .9fr;gap:2.5rem;align-items:start}
}
.foot .mega{
  margin:0;
  font-size:clamp(2.6rem,11vw,6rem);
  line-height:.88;
  font-weight:700;
  letter-spacing:-.06em;
}
@media (min-width:820px){
  .foot .mega{font-size:clamp(2.6rem,5.6vw,5rem)}
}
.foot-links menu{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:.15rem 1.6rem;
}
.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  text-decoration:none;
  font-size:1rem;
  border-bottom:1px solid rgba(255,255,255,.4);
  opacity:.92;
  transition:opacity .2s ease,border-color .2s ease;
}
.foot-links a:hover{opacity:1;border-color:var(--paper)}
.foot-meta .copy{margin:0;font-size:1rem;letter-spacing:.02em;opacity:.72}
@media (min-width:820px){
  .foot-meta{text-align:right}
}

/* ---------- 滚动显现 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(26px)}
.js [data-reveal].is-in{
  opacity:1;
  transform:none;
  transition:opacity .7s ease,transform .8s cubic-bezier(.22,1,.36,1);
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js [data-reveal]{opacity:1;transform:none;transition:none}
  .drawer-list a,.rail-list a{transition:none}
}

@media (max-width:420px){
  .toolbar{flex-wrap:nowrap}
  .find{max-width:none}
  .hero h1{letter-spacing:-.05em}
}

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