@import url('https://fonts.googleapis.com/css2?family=Amatic+SC:wght@400;700&family=Cabin:wght@400;500;600;700&display=swap');

:root{
  --ink:#000000;
  --paper:#ffffff;
  --sans:'Cabin',system-ui,-apple-system,'Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --display:'Amatic SC','Cabin',system-ui,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --pad:clamp(16px,4vw,40px);
}

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

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

body{
  margin:0;
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:linear-gradient(#ededed 1px,transparent 1px),linear-gradient(90deg,#ededed 1px,transparent 1px);
  background-size:56px 56px;
  overflow-x:hidden;
}

a{color:inherit;transition:color .2s ease,border-color .2s ease,background-color .2s ease,padding .2s ease}
img{max-width:100%}
:focus-visible{outline:2px solid #000;outline-offset:3px}

/* 顶部导航：品牌居中，链接分列两侧 */
.site-nav{
  position:sticky;
  top:0;
  z-index:60;
  background:#fff;
  border-bottom:1px solid #000;
}
.nav-list{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:.2rem;
  list-style:none;
  margin:0 auto;
  max-width:1200px;
  padding:.35rem var(--pad);
}
.nav-pad{flex:0 0 auto;width:clamp(44px,6vw,88px)}
.nav-list a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:.4rem .5rem;
  font-size:.94rem;
  letter-spacing:.03em;
  text-decoration:none;
  border-bottom:2px solid transparent;
}
.nav-list a:hover{border-bottom-color:#000}
.brand-li{flex:0 0 auto}
.brand-li a{
  font-family:var(--display);
  font-weight:700;
  font-size:1.6rem;
  letter-spacing:.08em;
  line-height:1;
  padding:.4rem .7rem;
  border-bottom:0;
  white-space:nowrap;
}
.brand-li a:hover{background:#000;color:#fff}

/* Hero：双图错位拼贴，文案居中 */
.hero{
  position:relative;
  display:grid;
  place-items:center;
  min-height:68vh;
  padding:calc(var(--pad) * 2) var(--pad);
  overflow:hidden;
}
.hero-art{position:absolute;inset:0;z-index:1;pointer-events:none}
.shot{position:absolute;margin:0;width:clamp(120px,19vw,250px)}
.shot-a{top:7%;left:1.5%;transform:rotate(-3.5deg)}
.shot-b{bottom:9%;right:1.5%;width:clamp(112px,16vw,210px);transform:rotate(2.5deg)}
.shot-img{
  display:block;
  width:100%;
  height:auto;
  border:1px solid #000;
  border-radius:10px;
  background:#fff;
  filter:grayscale(1) contrast(1.04);
}
.hero-copy{position:relative;z-index:2;max-width:44rem;text-align:center}
.badge{
  display:inline-block;
  margin-bottom:1.1rem;
  padding:.3rem 1.05rem;
  font-size:.88rem;
  letter-spacing:.24em;
  border:1px solid #000;
  border-radius:10px;
  background:rgba(255,255,255,.62);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  transform:rotate(-2deg);
}
.hero h1{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(2.4rem,7.5vw,5rem);
  line-height:1.06;
  letter-spacing:.02em;
  margin:0 0 1rem;
  word-break:break-word;
}
.lead{
  margin:0 auto;
  max-width:35rem;
  font-size:1.02rem;
  line-height:1.8;
  color:#000;
}

/* 正文骨架：内容区 + 右侧边栏 */
.wrap{
  display:grid;
  grid-template-columns:minmax(0,1fr) 260px;
  gap:clamp(1.5rem,3vw,2.5rem);
  max-width:1200px;
  margin:0 auto;
  padding:0 var(--pad) clamp(3rem,8vw,6rem);
}
.wrap > *{min-width:0}
.body{min-width:0}

.prose > section{
  position:relative;
  margin:0 0 clamp(1.25rem,3vw,2rem);
  padding:clamp(1.25rem,3vw,2.5rem);
  border:1px solid #000;
  border-radius:10px;
  background:rgba(255,255,255,.64);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  scroll-margin-top:92px;
  overflow-wrap:break-word;
}
.prose > section:last-child{margin-bottom:0}
.prose [id]{scroll-margin-top:92px}

.prose h2{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(1.65rem,3.8vw,2.5rem);
  line-height:1.14;
  letter-spacing:.02em;
  margin:0 0 .85rem;
}
.prose h3{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(1.3rem,2.7vw,1.75rem);
  line-height:1.2;
  margin:1.5rem 0 .5rem;
}
.prose p{margin:0 0 1.05rem;line-height:1.85}
.prose p:last-child{margin-bottom:0}
.prose ul,.prose ol{margin:0 0 1.15rem;padding-left:1.35rem}
.prose li{margin-bottom:.5rem;line-height:1.78}
.prose a{text-decoration:underline;text-underline-offset:3px}
.prose a:hover{background:#000;color:#fff;text-decoration:none}
.prose strong{font-weight:600}
.prose small{
  display:block;
  font-size:.76rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  opacity:.7;
  margin-bottom:.3rem;
}
.prose img{border:1px solid #000;border-radius:10px;height:auto;margin:.4rem 0}
.prose blockquote{
  margin:1.25rem 0;
  padding:.35rem 0 .35rem 1.1rem;
  border-left:3px solid #000;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose hr{border:0;border-top:1px solid #000;margin:1.6rem 0}
.prose table{width:100%;border-collapse:collapse;font-size:.94rem;margin:0 0 1.2rem}
.prose th,.prose td{border-bottom:1px solid #000;padding:.55rem .5rem;text-align:left;vertical-align:top}
.prose code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.9em;
  background:#f1f1f1;
  border-radius:4px;
  padding:.1em .35em;
}

/* 侧栏 */
.rail{
  position:sticky;
  top:88px;
  align-self:start;
  border-top:2px solid #000;
  padding-top:.5rem;
}
.kicker{display:block;font-size:.72rem;letter-spacing:.24em;opacity:.65}
.rail-title{
  font-family:var(--display);
  font-weight:700;
  font-size:1.95rem;
  line-height:1;
  letter-spacing:.04em;
  margin:.15rem 0 .85rem;
}
.rail-list{list-style:none;margin:0;padding:0}
.rail-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:.5rem .1rem;
  font-size:.94rem;
  text-decoration:none;
  border-bottom:1px solid rgba(0,0,0,.18);
}
.rail-list a:hover{border-bottom-color:#000;padding-left:.4rem}

/* 页脚 */
.site-foot{
  max-width:1200px;
  margin:0 auto;
  padding:clamp(2rem,6vw,4rem) var(--pad) 1.6rem;
  border-top:1px solid #000;
}
.foot-brand{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(3rem,13vw,8rem);
  line-height:.92;
  letter-spacing:.03em;
  margin:.2rem 0 1.2rem;
  word-break:break-word;
}
.foot-links ol{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:0 1.15rem;
  margin:0;
  padding:0;
}
.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.35rem 0;
  font-size:.9rem;
  text-decoration:none;
}
.foot-links a:hover{text-decoration:underline}
.foot-legal{
  border-top:1px solid rgba(0,0,0,.2);
  margin-top:.9rem;
  padding-top:.65rem;
}
.foot-legal p{margin:0;font-size:.82rem;letter-spacing:.06em;opacity:.7}

/* 滚动出现 */
.rv{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.rv.in{opacity:1;transform:none}

@media (min-width:780px){
  .site-foot{display:grid;grid-template-columns:1fr auto;align-items:end;gap:.4rem 2rem}
  .foot-hero{grid-column:1 / -1}
  .foot-legal{border-top:0;margin-top:0;padding-top:0;text-align:right}
}

@media (max-width:900px){
  .wrap{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;top:auto}
  .rail-list{display:flex;flex-wrap:wrap;gap:0 1.1rem}
  .rail-list li{flex:0 0 auto}
  .rail-list a{border-bottom:0;padding:.45rem 0;text-decoration:underline;text-underline-offset:3px}
  .rail-list a:hover{padding-left:0}
}

@media (max-width:860px){
  .site-nav{position:static}
  .nav-list{flex-wrap:wrap;justify-content:center;gap:.1rem .3rem;padding:.4rem var(--pad) .55rem}
  .nav-pad{display:none}
  .brand-li{order:-1;width:100%;text-align:center;padding-bottom:.2rem}
  .brand-li a{font-size:1.45rem}
  .nav-list a{min-height:44px;font-size:.86rem;padding:.4rem .3rem;letter-spacing:0}
  .hero{display:block;min-height:0;padding:1.75rem var(--pad) 2rem}
  .hero-art{position:static;display:grid;grid-template-columns:1fr 1fr;gap:.7rem;margin-top:1.4rem;pointer-events:auto}
  .shot{position:static;transform:none;width:auto}
  .hero-copy{max-width:none;text-align:left}
  .badge{transform:none;margin-bottom:.75rem}
  .lead{max-width:none;margin:0}
  .prose > section{padding:1.15rem}
  .prose > section,.prose [id]{scroll-margin-top:24px}
}

@media (max-width:640px){
  body{font-size:16px;background-size:40px 40px}
  .foot-brand{font-size:clamp(2.6rem,15vw,4rem)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
  .rv{opacity:1;transform:none}
}

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