@import url('https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,300;0,400;0,500;0,700;1,400&display=swap');

:root{
  --blue:#3bb1ff;
  --red:#ff5252;
  --ink:#000;
  --paper:#eef8ff;
  --tint:#d9efff;
  --line:3px solid #000;
  --hard:6px 6px 0 #000;
  --hard-s:4px 4px 0 #000;
  --wrap:1180px;
  --head:112px;
}

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

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

body{
  margin:0;
  max-width:100%;
  overflow-x:clip;
  overflow-wrap:break-word;
  font-family:'Roboto',system-ui,-apple-system,'Segoe UI','Noto Sans SC',sans-serif;
  font-size:17px;
  line-height:1.7;
  color:var(--ink);
  background:var(--paper);
}

img{max-width:100%;display:block}
a{color:inherit}
p{margin:0 0 1em}
h1,h2,h3,h4{font-weight:700;line-height:1.15;letter-spacing:-.01em;overflow-wrap:break-word}
main,section,article,aside,footer,header,nav,div,dl,dt,dd,li{min-width:0}

article[id]{scroll-margin-top:var(--head)}

/* ---------- 顶栏 ---------- */
.site-head{
  background:#fff;
  border-bottom:var(--line);
}

.ticker{
  margin:0;
  background:var(--ink);
  color:#fff;
  font-size:14px;
  font-weight:700;
  letter-spacing:.26em;
  padding:7px 14px;
  text-align:center;
  text-transform:uppercase;
  overflow-wrap:anywhere;
}

.brandbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:10px 16px;
  max-width:var(--wrap);
  margin:0 auto;
  min-height:64px;
}

.mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:48px;
  min-height:48px;
  padding:4px;
  border:var(--line);
  background:var(--blue);
  box-shadow:var(--hard-s);
  text-decoration:none;
  font-size:22px;
  font-weight:700;
  line-height:1;
}
.mark:active{transform:translate(2px,2px);box-shadow:2px 2px 0 #000}
.mark-img{width:34px;height:34px;object-fit:contain}

.drop{position:relative}
.drop summary{
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:10px 20px;
  border:var(--line);
  background:var(--red);
  color:#fff;
  font-weight:700;
  box-shadow:var(--hard-s);
  user-select:none;
}
.drop summary::-webkit-details-marker{display:none}
.drop[open] summary{background:var(--ink)}
.droplist{
  position:absolute;
  right:0;
  top:calc(100% + 8px);
  width:min(80vw,290px);
  background:#fff;
  border:var(--line);
  box-shadow:var(--hard);
  z-index:60;
  display:flex;
  flex-direction:column;
}
.droplist a{
  display:flex;
  align-items:center;
  min-height:46px;
  padding:10px 16px;
  text-decoration:none;
  font-weight:700;
  border-bottom:2px solid #000;
}
.droplist a:last-child{border-bottom:0}
.droplist a:hover,.droplist a:focus{background:var(--blue)}

.jump{
  display:none;
  position:sticky;
  top:0;
  z-index:50;
  background:var(--ink);
  border-bottom:var(--line);
  overflow-x:auto;
  -webkit-overflow-scrolling:touch;
}
.jump-a{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:0 18px;
  color:#fff;
  text-decoration:none;
  font-weight:700;
  font-size:15px;
  white-space:nowrap;
  border-right:1px solid #3a3a3a;
}
.jump-a:hover,.jump-a:focus{background:var(--blue);color:#000}

/* ---------- 头图 ---------- */
.hero{
  min-height:100vh;
  display:flex;
  align-items:center;
  padding:64px 18px;
  border-bottom:6px solid #000;
  background:var(--paper);
  overflow:hidden;
}
.hero-inner{
  width:100%;
  max-width:var(--wrap);
  min-width:0;
  margin:0 auto;
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:26px;
  will-change:transform;
}
.hero h1{
  margin:0;
  font-size:clamp(2.1rem,9.8vw,6.2rem);
  line-height:1.03;
  letter-spacing:-.03em;
  text-align:left;
  max-width:min(17ch,100%);
  overflow-wrap:break-word;
  word-break:break-word;
  text-shadow:6px 6px 0 rgba(59,177,255,.9);
}
.badge{
  align-self:flex-end;
  margin:0;
  transform:rotate(-5deg);
  background:var(--red);
  color:#fff;
  border:var(--line);
  box-shadow:var(--hard);
  padding:9px 18px;
  font-weight:700;
  font-size:16px;
  line-height:1.4;
  max-width:70vw;
  word-break:break-word;
}

/* ---------- 主区域 ---------- */
main{
  max-width:var(--wrap);
  margin:0 auto;
  padding:40px 16px 72px;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:26px;
  align-items:start;
}

/* ---------- 侧栏 ---------- */
.rail{
  border:var(--line);
  background:#fff;
  box-shadow:var(--hard);
  padding:16px 14px 10px;
}
.rail small{
  display:block;
  font-size:13px;
  font-weight:700;
  letter-spacing:.18em;
  color:#666;
}
.rail h2{
  margin:2px 0 12px;
  font-size:1.35rem;
  padding-bottom:8px;
  border-bottom:3px solid #000;
}
.rail-nav{display:flex;flex-direction:column}
.rail-a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 6px;
  text-decoration:none;
  font-weight:700;
  font-size:16px;
  border-bottom:2px dashed #000;
  overflow-wrap:break-word;
}
.rail-a:last-child{border-bottom:0}
.rail-a:hover,.rail-a:focus{background:var(--tint)}

/* ---------- 正文 ---------- */
.body{min-width:0}
.body>article{
  background:rgba(255,255,255,.8);
  border:var(--line);
  box-shadow:var(--hard);
  padding:22px 18px 12px;
  margin:0 0 34px;
}
.body article>*:first-child{margin-top:0}
.body small{
  display:block;
  font-size:13px;
  font-weight:700;
  letter-spacing:.16em;
  color:#5c5c5c;
  margin:0 0 6px;
}
.body h2{
  font-size:clamp(1.45rem,4.4vw,2rem);
  margin:0 0 16px;
  padding-bottom:10px;
  border-bottom:3px solid #000;
}
.body h3{
  font-size:clamp(1.2rem,3.4vw,1.45rem);
  margin:26px 0 12px;
}
.body h2+h3{margin-top:6px}
.body p{font-size:17px;overflow-wrap:break-word}
.body a{
  color:#0a5c8f;
  font-weight:700;
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:2px;
  overflow-wrap:anywhere;
}
.body a:hover{background:var(--blue);color:#000}
.body ul,.body ol{padding-left:1.35em;margin:0 0 1em}
.body li{margin:0 0 .5em;overflow-wrap:break-word}
.body li::marker{color:var(--red);font-weight:700}
.body blockquote{
  margin:0 0 1.2em;
  padding:14px 16px;
  background:var(--tint);
  border:var(--line);
  border-right-width:8px;
  box-shadow:var(--hard-s);
}
.body blockquote p:last-child{margin-bottom:0}
.body figure{
  margin:0 0 1.3em;
  max-width:100%;
  border:var(--line);
  box-shadow:var(--hard-s);
  background:#fff;
  padding:8px;
}
.body figcaption{
  font-size:14px;
  margin-top:8px;
  color:#444;
  overflow-wrap:break-word;
}
.body table{
  width:100%;
  max-width:100%;
  border-collapse:collapse;
  margin:0 0 1.3em;
  font-size:16px;
  display:block;
  overflow-x:auto;
}
.body th,.body td{
  border:2px solid #000;
  padding:9px 11px;
  text-align:left;
  vertical-align:top;
  overflow-wrap:break-word;
}
.body th{background:var(--blue);font-weight:700}
.body tr:nth-child(even) td{background:#f7fbff}
.body code,.body pre{
  font-family:ui-monospace,'SFMono-Regular',Consolas,monospace;
  font-size:15px;
  overflow-wrap:break-word;
}
.body pre{
  max-width:100%;
  border:var(--line);
  padding:14px;
  overflow-x:auto;
  background:#fff;
}
.body hr{border:0;border-top:3px dashed #000;margin:26px 0}

/* ---------- 页脚 ---------- */
.site-foot{
  background:var(--ink);
  color:#fff;
  border-top:8px solid var(--blue);
  padding:40px 16px 22px;
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:22px;
}
.site-foot small{
  display:block;
  font-size:13px;
  font-weight:700;
  letter-spacing:.2em;
  color:#bdbdbd;
  margin-bottom:6px;
}
.foot-cta{
  min-width:0;
  border:3px solid #fff;
  background:var(--red);
  padding:20px 18px;
  box-shadow:6px 6px 0 #fff;
}
.foot-cta small{color:#ffe4e4}
.foot-cta h2{
  margin:0 0 16px;
  font-size:clamp(1.4rem,5vw,1.9rem);
  word-break:break-word;
}
.cta-link{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:10px 22px;
  background:#000;
  color:#fff;
  border:3px solid #fff;
  box-shadow:4px 4px 0 var(--blue);
  text-decoration:none;
  font-weight:700;
}
.cta-link:hover,.cta-link:focus{background:var(--blue);color:#000}
.foot-link nav{border:3px solid #fff;padding:6px 10px}
.foot-link dl{margin:0}
.foot-link dt a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 6px;
  color:#fff;
  text-decoration:none;
  font-weight:700;
  border-bottom:2px solid #333;
  overflow-wrap:break-word;
}
.foot-link dt:last-of-type a{border-bottom:0}
.foot-link dt a:hover,.foot-link dt a:focus{background:var(--blue);color:#000}
.foot-link dd:empty{display:none}
.foot-mark{
  min-width:0;
  border:3px solid #fff;
  padding:16px;
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
}
.foot-badge .mark{box-shadow:4px 4px 0 #fff}
.foot-brand{
  margin:0;
  font-weight:700;
  font-size:19px;
  word-break:break-word;
}
.foot-bottom{
  grid-column:1/-1;
  border-top:3px solid #fff;
  padding-top:16px;
  text-align:center;
}
.foot-bottom p{margin:0;font-size:15px;color:#c9c9c9;word-break:break-word}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion:no-preference){
  .body>article{
    animation:rise .5s cubic-bezier(.2,.7,.3,1) both;
  }
  .body>article:nth-child(2){animation-delay:.05s}
  .body>article:nth-child(3){animation-delay:.1s}
  .body>article:nth-child(4){animation-delay:.15s}
  .body>article:nth-child(5){animation-delay:.2s}
  .body>article:nth-child(6){animation-delay:.25s}
  .body>article:nth-child(7){animation-delay:.3s}
  .hero h1{animation:pop .55s cubic-bezier(.2,.8,.2,1) both}
  .badge{animation:pop .65s .1s cubic-bezier(.2,.8,.2,1) both}
  @keyframes rise{
    from{opacity:0;transform:translateY(20px)}
    to{opacity:1;transform:none}
  }
  @keyframes pop{
    from{opacity:0;transform:translate(0,16px) rotate(0)}
    to{opacity:1;transform:none}
  }
  .badge{animation-name:pop-badge}
  @keyframes pop-badge{
    from{opacity:0;transform:translate(0,16px) rotate(-5deg)}
    to{opacity:1;transform:rotate(-5deg)}
  }
}

/* ---------- 断点 ---------- */
@media (min-width:760px){
  .brandbar{padding:12px 24px}
  main{padding:48px 24px 80px}
  .body>article{padding:28px 26px 14px}
}

@media (min-width:820px){
  .drop{display:none}
  .jump{display:flex}
  .site-foot{
    grid-template-columns:minmax(0,1.35fr) minmax(0,1fr) minmax(0,1fr);
    gap:28px;
    align-items:start;
    padding:52px 36px 24px;
  }
}

@media (min-width:960px){
  main{
    grid-template-columns:256px minmax(0,1fr);
    gap:36px;
    padding:56px 24px 96px;
  }
  .rail{position:sticky;top:78px}
  .hero{padding:80px 24px}
}

@media (min-width:1180px){
  .hero h1{font-size:6.2rem}
}

@media (max-width:400px){
  .hero{padding:48px 14px}
  .badge{align-self:flex-start;max-width:calc(100vw - 40px)}
  .foot-cta{padding:16px 14px}
  .body>article{padding:18px 14px 10px}
}

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