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

:root{
  --ink:#000000;
  --blue:#3bb1ff;
  --red:#ff5252;
  --paper:#ffffff;
  --wash:#eef2f5;
  --line:3px solid var(--ink);
  --hard:5px 5px 0 var(--ink);
  --head:'Russo One','Chakra Petch',"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --body:'Chakra Petch',"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(--wash);
  color:var(--ink);
  font-family:var(--body);
  font-size:17px;
  line-height:1.72;
  overflow-x:hidden;
}

h1,h2,h3,h4{font-family:var(--head);font-weight:400;letter-spacing:.01em}
p{margin:0 0 16px}
img{max-width:100%}

a{color:inherit}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:4px solid var(--red);
  outline-offset:3px;
}

.sr{
  position:absolute;
  width:1px;height:1px;
  overflow:hidden;
  clip-path:inset(50%);
  white-space:nowrap;
}

/* ---------- 顶部两行 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--paper);
  border-bottom:3px solid var(--ink);
}

.brandrow{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
  padding:10px 22px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:48px;
  padding:5px 16px 5px 8px;
  background:var(--blue);
  border:var(--line);
  border-radius:10px;
  box-shadow:var(--hard);
  text-decoration:none;
  font-family:var(--head);
  font-size:clamp(1.15rem,3.6vw,1.6rem);
  letter-spacing:.04em;
  color:var(--ink);
}
.brand .mark{
  display:block;
  width:34px;height:34px;
  object-fit:cover;
  border:3px solid var(--ink);
  border-radius:8px;
  background:#fff;
}

.find{
  display:flex;
  align-items:stretch;
  border:var(--line);
  border-radius:999px;
  background:#fff;
  box-shadow:4px 4px 0 var(--ink);
  overflow:hidden;
}
.find input{
  font:inherit;
  font-size:16px;
  width:15ch;
  min-width:0;
  min-height:44px;
  padding:0 14px;
  border:0;
  background:transparent;
  color:var(--ink);
}
.find input:focus{outline:none;background:#e3f3ff}
.find-btn{
  font:inherit;
  font-weight:700;
  letter-spacing:.1em;
  min-height:44px;
  padding:0 16px;
  border:0;
  border-left:var(--line);
  background:var(--red);
  color:#fff;
  cursor:pointer;
}
.find-btn:hover{background:var(--blue);color:var(--ink)}

.navbar{padding:0 22px 13px}

.navdetails{display:block}

.sum{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 18px;
  border:var(--line);
  border-radius:999px;
  background:#fff;
  box-shadow:4px 4px 0 var(--ink);
  font-weight:700;
  cursor:pointer;
  user-select:none;
  list-style:none;
}
.sum::-webkit-details-marker{display:none}
.sum::before{
  content:"";
  width:12px;height:12px;
  background:var(--red);
  border:3px solid var(--ink);
  border-radius:3px;
}
.sum:hover{background:var(--blue)}

.menu{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:13px 0 0;
  padding:0;
}
.menu li{display:block}
.menu a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 16px;
  border:var(--line);
  border-radius:999px;
  background:#fff;
  box-shadow:4px 4px 0 var(--ink);
  color:var(--ink);
  text-decoration:none;
  font-weight:700;
  transition:transform .12s ease,background .12s ease,box-shadow .12s ease;
}
.menu a:hover,.menu a:focus-visible{
  background:var(--blue);
  transform:translate(-2px,-2px);
  box-shadow:6px 6px 0 var(--ink);
}

@keyframes pop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}
.navdetails[open] .menu li{animation:pop .3s ease backwards}
.navdetails[open] .menu li:nth-child(2){animation-delay:.04s}
.navdetails[open] .menu li:nth-child(3){animation-delay:.08s}
.navdetails[open] .menu li:nth-child(4){animation-delay:.12s}
.navdetails[open] .menu li:nth-child(5){animation-delay:.16s}
.navdetails[open] .menu li:nth-child(6){animation-delay:.2s}
.navdetails[open] .menu li:nth-child(7){animation-delay:.24s}

/* ---------- 满屏主视觉 ---------- */
.hero{
  position:relative;
  display:flex;
  align-items:flex-end;
  justify-content:flex-end;
  min-height:100vh;
  min-height:100svh;
  padding:172px 26px 124px;
  background:var(--ink);
  border-bottom:6px solid var(--ink);
  overflow:hidden;
}
.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  z-index:0;
  filter:grayscale(.18) contrast(1.06);
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:rgba(0,0,0,.6);
}
.hero::after{
  content:"";
  position:absolute;
  left:-8%;right:-8%;
  bottom:-34px;
  height:76px;
  z-index:1;
  background:var(--blue);
  border-top:6px solid var(--ink);
  border-bottom:6px solid var(--ink);
  transform:skewY(-2.4deg);
}
.hero-in{
  position:relative;
  z-index:2;
  max-width:820px;
  text-align:right;
  color:#fff;
}
.hero h1{
  margin:0 0 18px;
  font-size:clamp(2rem,7.2vw,4.4rem);
  line-height:1.1;
  text-shadow:5px 5px 0 var(--ink);
}
.lead{
  margin:0 0 24px auto;
  max-width:32em;
  color:#fff;
  font-size:clamp(1rem,2.2vw,1.14rem);
}
.hero-cta{margin:0}
.btn{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 28px;
  border:var(--line);
  border-radius:10px;
  background:var(--red);
  color:#fff;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  box-shadow:6px 6px 0 var(--ink);
  transition:transform .12s ease,background .12s ease,box-shadow .12s ease;
}
.btn:hover{
  background:var(--blue);
  color:var(--ink);
  transform:translate(-2px,-2px);
  box-shadow:8px 8px 0 var(--ink);
}

/* ---------- 正文 + 右侧栏 ---------- */
.shell{
  max-width:1180px;
  margin:0 auto;
  padding:58px 24px 74px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 300px;
  gap:36px;
  align-items:start;
}

.doc > div{
  background:var(--paper);
  border:var(--line);
  border-radius:10px;
  padding:26px 26px 30px;
  margin:0 0 32px;
  scroll-margin-top:196px;
}
.doc > div:last-child{margin-bottom:0}

.doc h2{
  margin:0;
  font-size:clamp(1.38rem,3.5vw,2rem);
  line-height:1.26;
}
.doc h3{
  margin:28px 0 10px;
  font-size:clamp(1.1rem,2.5vw,1.32rem);
  line-height:1.35;
}
.doc h4{margin:22px 0 8px;font-size:1.05rem}

hr{
  border:0;
  border-top:4px solid var(--ink);
  margin:14px 0 20px;
}

.doc p{margin:0 0 16px}
.doc a{
  color:#0a63a0;
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.doc a:hover{background:#dff0ff}
.doc strong{
  background:var(--blue);
  border-radius:4px;
  padding:0 .18em;
  font-weight:700;
}
.doc ul,.doc ol{margin:0 0 18px;padding-left:1.4em}
.doc li{margin:0 0 8px}
.doc blockquote{
  margin:0 0 18px;
  padding:14px 18px;
  border-left:8px solid var(--blue);
  background:#eef7ff;
  border-radius:0 10px 10px 0;
}
.doc blockquote p:last-child{margin-bottom:0}
.doc table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 18px;
  font-size:.96rem;
}
.doc th,.doc td{
  border:3px solid var(--ink);
  padding:10px 12px;
  text-align:left;
  vertical-align:top;
}
.doc th{background:var(--blue)}
.doc img{
  display:block;
  height:auto;
  margin:0 0 18px;
  border:3px solid var(--ink);
  border-radius:10px;
}
.doc code{
  background:var(--ink);
  color:#fff;
  padding:.1em .4em;
  border-radius:4px;
  font-size:.92em;
}
.doc pre{
  margin:0 0 18px;
  padding:16px;
  background:var(--ink);
  color:#fff;
  border-radius:10px;
  overflow:auto;
}
.doc pre code{background:none;padding:0}

.rail{
  position:sticky;
  top:186px;
  background:var(--paper);
  border:var(--line);
  border-radius:10px;
  padding:18px 20px 20px;
}
.rail-t{margin:0;font-size:1.1rem}
.rail-list{
  list-style:none;
  counter-reset:rail;
  margin:0;
  padding:0;
}
.rail-list li{
  counter-increment:rail;
  border-bottom:2px dashed #c7ccd3;
}
.rail-list li:last-child{border-bottom:0}
.rail-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  color:var(--ink);
  font-weight:700;
  text-decoration:none;
}
.rail-list a::before{
  content:counter(rail,decimal-leading-zero);
  font-family:var(--head);
  color:var(--red);
  font-size:.92rem;
}
.rail-list a:hover{color:#0a63a0;text-decoration:underline}
.rail-back{margin:16px 0 0}
.rail-back a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 14px;
  border:var(--line);
  border-radius:999px;
  background:var(--ink);
  color:#fff;
  font-weight:700;
  text-decoration:none;
  font-size:.92rem;
}
.rail-back a:hover{background:var(--red)}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:24px;
  padding:40px 24px 22px;
  background:var(--ink);
  color:#fff;
  border-top:6px solid var(--ink);
}
.foot-brand{
  margin:0 0 26px;
  font-family:var(--head);
  font-size:clamp(2.4rem,12vw,6rem);
  line-height:1;
  letter-spacing:.02em;
  color:var(--blue);
  word-break:break-word;
}
.foot-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
  margin:0 0 28px;
}
.foot dl{margin:0}
.foot dt{
  margin:0 0 8px;
  font-family:var(--head);
  font-size:.9rem;
  letter-spacing:.12em;
  color:var(--red);
}
.foot dd{margin:0}
.foot dd a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  color:#fff;
  font-weight:600;
  text-decoration:none;
}
.foot dd a:hover{color:var(--blue);text-decoration:underline}
.foot-bar{
  margin:0;
  padding-top:14px;
  border-top:3px solid #4a4a4a;
  font-size:.9rem;
  color:#ccd2d8;
}

/* ---------- 滚动渐显 ---------- */
.will-in{opacity:0;transform:translateY(16px)}
.will-in.in{
  opacity:1;
  transform:none;
  transition:opacity .5s ease,transform .5s ease;
  transition-delay:var(--d,0ms);
}

/* ---------- 断点 ---------- */
@media (min-width:900px){
  .sum{display:none}
  .navdetails > .menu{display:flex;margin-top:0}
  .navbar{padding-bottom:14px}
}

@media (max-width:899px){
  .brandrow{padding:10px 16px}
  .navbar{padding:0 16px 12px}
  .find input{width:11ch}
  .hero{padding:150px 16px 104px}
  .shell{
    grid-template-columns:minmax(0,1fr);
    gap:26px;
    padding:38px 16px 56px;
  }
  .rail{position:static;order:2}
  .doc > div{padding:20px 16px 24px;scroll-margin-top:126px}
  .foot-grid{grid-template-columns:1fr}
  .foot{padding:32px 16px 20px}
}

@media (max-width:420px){
  body{font-size:16px}
  .find input{width:8ch}
  .hero h1{text-shadow:4px 4px 0 var(--ink)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{animation:none !important;transition:none !important}
}

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