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

:root{
  --ink:#000000;
  --blue:#3bb1ff;
  --red:#ff5252;
  --paper:#f7f3e8;
  --card:#ffffff;
  --line:3px solid #000000;
  --punch:6px 6px 0 #000000;
  --r:10px;
}

*,*::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:'Lato',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;
  font-size:17px;
  line-height:1.7;
  font-weight:400;
}

h1,h2,h3,h4{
  font-family:'EB Garamond',Georgia,'Times New Roman',serif;
  font-weight:600;
  line-height:1.14;
  letter-spacing:-.012em;
  margin:0 0 .5em;
}

p{margin:0 0 1em}
p:last-child{margin-bottom:0}

img{display:block;max-width:100%;height:auto}

a{color:inherit}

hr{
  border:0;
  border-top:4px solid #000000;
  margin:16px 0;
}

::selection{background:var(--red);color:#fff}

.skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:99;
  background:var(--blue);
  border:var(--line);
  border-radius:8px;
  padding:10px 16px;
  font-weight:700;
  text-decoration:none;
}
.skip:focus{left:12px;top:12px}

/* ---------- 左侧竖排栏 ---------- */

.frame{display:block}

.rail{
  border-bottom:var(--line);
  background:var(--card);
  padding:14px;
  display:grid;
  gap:12px;
}

.rail-top{
  display:flex;
  align-items:center;
  gap:12px;
}

.mark{
  display:inline-grid;
  place-items:center;
  width:52px;
  height:52px;
  flex:0 0 auto;
  border:var(--line);
  border-radius:8px;
  background:var(--red);
  box-shadow:4px 4px 0 #000;
  font-family:'EB Garamond',Georgia,serif;
  font-size:1.5rem;
  font-weight:700;
  text-decoration:none;
  transition:transform .14s ease,box-shadow .14s ease;
}
.mark:hover{transform:translate(3px,3px);box-shadow:1px 1px 0 #000}

.rail-brand{
  margin:0;
  font-weight:700;
  font-size:1rem;
  letter-spacing:.1em;
}

.rail-nav ol{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:8px;
}

.rail-nav a{
  display:flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:9px 10px;
  border:var(--line);
  border-radius:8px;
  background:#fff;
  font-size:1rem;
  font-weight:700;
  text-decoration:none;
  transition:background .14s ease,transform .14s ease,box-shadow .14s ease;
}
.rail-nav a:hover{background:var(--blue);transform:translate(2px,-2px);box-shadow:3px 3px 0 #000}
.rail-nav a.is-on{background:var(--blue);box-shadow:4px 4px 0 #000}

.rail-nav .num{
  font-family:'EB Garamond',Georgia,serif;
  font-size:.86rem;
  line-height:1;
  padding-right:8px;
  border-right:2px solid #000;
  opacity:.65;
}
.rail-nav .lab{min-width:0;overflow-wrap:anywhere}

.rail-foot{display:flex}

.contact{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:8px 20px;
  border:var(--line);
  border-radius:8px;
  background:var(--blue);
  box-shadow:4px 4px 0 #000;
  font-weight:700;
  text-decoration:none;
  transition:transform .14s ease,box-shadow .14s ease;
}
.contact:hover{transform:translate(3px,3px);box-shadow:1px 1px 0 #000}

/* ---------- 主区 ---------- */

.stage{min-width:0}

main{
  padding:20px 16px 0;
  max-width:1120px;
  margin:0 auto;
}

.hero{
  border:var(--line);
  border-radius:var(--r);
  background:var(--blue);
  box-shadow:8px 8px 0 #000;
  padding:clamp(22px,4vw,46px);
  min-height:58vh;
  display:grid;
  gap:24px;
  align-content:center;
  margin-bottom:36px;
}

.hero h1{
  font-size:clamp(2.4rem,8.5vw,5rem);
  line-height:1.02;
  margin:0 0 .4em;
  overflow-wrap:anywhere;
}

.lede{
  margin:0;
  max-width:44ch;
  font-size:1.06rem;
  border-left:6px solid #000;
  padding-left:14px;
}

.plate{
  margin:0;
  border:var(--line);
  border-radius:var(--r);
  background:#fff;
  box-shadow:var(--punch);
  padding:10px;
  display:grid;
  place-items:center;
  overflow:hidden;
}

.plate-img{width:100%;border-radius:6px}

.plate-word{
  font-family:'EB Garamond',Georgia,serif;
  font-size:clamp(1.3rem,6vw,2rem);
  font-weight:700;
  text-align:center;
  padding:16px 8px;
  overflow-wrap:anywhere;
}

.spread{display:grid;gap:28px}

/* ---------- 正文卡 ---------- */

.prose{min-width:0}

.prose section{
  border:var(--line);
  border-radius:var(--r);
  background:var(--card);
  padding:clamp(18px,3.2vw,34px);
  margin:0 0 26px;
  scroll-margin-top:18px;
  animation:lift .5s cubic-bezier(.2,.7,.3,1) both;
}

.prose section:nth-child(2n){background:#fffdf4}
.prose section:nth-child(1){animation-delay:.02s}
.prose section:nth-child(2){animation-delay:.07s}
.prose section:nth-child(3){animation-delay:.12s}
.prose section:nth-child(4){animation-delay:.17s}
.prose section:nth-child(5){animation-delay:.22s}
.prose section:nth-child(6){animation-delay:.27s}
.prose section:nth-child(7){animation-delay:.32s}

@keyframes lift{
  from{opacity:0;transform:translateY(16px)}
  to{opacity:1;transform:none}
}

.prose h2{
  font-size:clamp(1.5rem,4vw,2.1rem);
  margin:0 0 .55em;
}

.prose h3{
  font-size:clamp(1.2rem,3vw,1.5rem);
  margin:1.2em 0 .5em;
}
.prose h3:first-child{margin-top:0}

.prose h2 + hr,.prose h3 + hr{margin-top:-2px}

.prose ul,.prose ol{padding-left:1.3em;margin:0 0 1em}
.prose li{margin:0 0 .35em}

.prose a{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.prose a:hover{background:var(--blue)}

.prose blockquote{
  margin:0 0 1em;
  padding:12px 16px;
  border:var(--line);
  border-left-width:8px;
  border-radius:8px;
  background:#fffdf4;
  font-family:'EB Garamond',Georgia,serif;
  font-size:1.08rem;
}

.prose img{border:var(--line);border-radius:8px;margin:0 0 1em}

.prose figure{margin:0 0 1.2em}
.prose figcaption{font-size:.95rem;line-height:1.6;margin-top:.4em}

.prose table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 1em;
  font-size:.98rem;
}
.prose th,.prose td{border:2px solid #000;padding:8px 10px;text-align:left}
.prose th{background:var(--blue)}

/* ---------- 右侧 aside ---------- */

.side{
  order:-1;
  border:var(--line);
  border-radius:var(--r);
  background:#fff;
  box-shadow:6px 6px 0 var(--red);
  padding:16px;
  align-self:start;
}

.side h2{font-size:1.3rem;margin:0 0 .3em}
.side hr{margin:0 0 12px}

.side ol{list-style:none;margin:0;padding:0;display:grid;gap:4px}

.side a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:9px 8px;
  border-bottom:2px solid #000;
  font-size:1rem;
  font-weight:700;
  text-decoration:none;
  transition:background .14s ease,padding-left .14s ease;
}
.side a:last-child{border-bottom:0}
.side a:hover,.side a.is-on{background:var(--blue);padding-left:14px}

/* ---------- 页脚 ---------- */

.foot{
  border-top:var(--line);
  margin-top:44px;
  background:#fff;
}

.foot section{
  padding:clamp(18px,4vw,42px);
  border-bottom:var(--line);
  max-width:1120px;
  margin:0 auto;
}

.foot-cta{background:var(--red)}

.foot-cta a{
  display:inline-flex;
  align-items:center;
  min-height:56px;
  padding:10px 26px;
  border:var(--line);
  border-radius:var(--r);
  background:#fff;
  box-shadow:var(--punch);
  font-family:'EB Garamond',Georgia,serif;
  font-size:clamp(1.5rem,5.5vw,3rem);
  font-weight:700;
  text-decoration:none;
  transition:transform .15s ease,box-shadow .15s ease;
}
.foot-cta a:hover{transform:translate(4px,4px);box-shadow:1px 1px 0 #000}

.foot-main{display:grid;gap:26px}

.foot-word{
  font-family:'EB Garamond',Georgia,serif;
  font-size:1.5rem;
  font-weight:700;
  margin:12px 0 .4em;
  letter-spacing:.02em;
}

.foot-desc{max-width:42ch;font-size:1rem}

.foot-nav dl{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:4px 14px;
  margin:0;
}

.foot-nav dt{
  font-family:'EB Garamond',Georgia,serif;
  font-size:.95rem;
  opacity:.55;
  display:flex;
  align-items:center;
  min-height:44px;
}

.foot-nav dd{margin:0}

.foot-nav dd a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 6px;
  border-bottom:2px solid #000;
  font-weight:700;
  text-decoration:none;
  transition:background .14s ease,padding-left .14s ease;
}
.foot-nav dd a:hover{background:var(--blue);padding-left:12px}

.foot-legal{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  justify-content:space-between;
  align-items:center;
  font-size:1rem;
  border-bottom:0;
}

.foot-legal .copy{margin:0;font-weight:700}

.totop{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 16px;
  border:var(--line);
  border-radius:8px;
  background:var(--paper);
  font-weight:700;
  text-decoration:none;
}
.totop:hover{background:var(--blue)}

/* ---------- 宽屏 ---------- */

@media (min-width:760px){
  .foot-main{grid-template-columns:1fr 1fr;align-items:start}
  .hero{grid-template-columns:1fr}
}

@media (min-width:900px){
  .hero{grid-template-columns:1.4fr .8fr;align-items:center;min-height:62vh}
  .rail-nav ol{grid-template-columns:1fr}
  main{padding:28px 24px 0}
}

@media (min-width:1024px){
  .rail{
    position:fixed;
    left:0;
    top:0;
    bottom:0;
    width:250px;
    border-bottom:0;
    border-right:var(--line);
    display:flex;
    flex-direction:column;
    gap:18px;
    padding:22px 18px;
    overflow-y:auto;
  }
  .stage{margin-left:250px}
  .spread{grid-template-columns:minmax(0,1fr) 278px;align-items:start;gap:30px}
  .side{order:0;position:sticky;top:22px}
  main{padding:34px 30px 0}
}

@media (min-width:1280px){
  main{padding:44px 40px 0}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .prose section{opacity:1;transform:none}
}

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