@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@700&display=swap');

:root{
  --cream:#F4EBD8;
  --ink:#121212;
  --red:#FF4B2B;
  --glass:rgba(255,255,255,.62);
  --edge:2px solid var(--ink);
  --radius:10px;
}

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

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

body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font-family:"Space Grotesk",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.7;
  overflow-x:hidden;
}

a{color:inherit}
img{max-width:100%;height:auto}

:focus-visible{outline:3px solid var(--red);outline-offset:2px}

/* 顶部细条 */
.tape{
  background:var(--ink);
  color:var(--cream);
  border-bottom:3px solid var(--ink);
  overflow:hidden;
}
.tape-track{
  display:flex;
  width:max-content;
  white-space:nowrap;
  animation:tape-slide 30s linear infinite;
}
.tape-track span{
  padding:7px 0 7px 18px;
  font-size:16px;
  letter-spacing:.14em;
}
.tape-track span::after{
  content:"★";
  margin-left:18px;
  color:var(--red);
}
@keyframes tape-slide{
  from{transform:translateX(0)}
  to{transform:translateX(-50%)}
}

/* 顶部导航 */
.topbar{
  position:sticky;
  top:0;
  z-index:30;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:14px;
  padding:12px 20px;
  background:var(--cream);
  border-bottom:3px solid var(--ink);
}

.side ol{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.side-r ol{justify-content:flex-end}

.side a,
.rail-list a,
.foot-row nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:9px 15px;
  font-size:16px;
  line-height:1.2;
  text-decoration:none;
  color:var(--ink);
  background:rgba(255,255,255,.55);
  border:var(--edge);
  border-radius:999px;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.side a:hover,
.rail-list a:hover{
  background:var(--red);
  color:#fff;
  transform:translateY(-2px);
}

.mark{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:8px 18px;
  font-size:20px;
  line-height:1;
  letter-spacing:-.02em;
  text-decoration:none;
  color:var(--ink);
  background:var(--red);
  border:var(--edge);
  border-radius:999px;
  transform:rotate(-2deg);
  box-shadow:4px 4px 0 var(--ink);
  white-space:nowrap;
}

/* 首屏 */
.hero{
  position:relative;
  min-height:45vh;
  display:flex;
  align-items:flex-end;
  justify-content:flex-end;
  padding:54px 24px 44px;
  overflow:hidden;
  border-bottom:3px solid var(--ink);
  background:
    radial-gradient(circle at 84% 16%,rgba(255,75,43,.18),transparent 62%),
    var(--cream);
}
.hero::before{
  content:"";
  position:absolute;
  left:-12%;
  right:-12%;
  bottom:-40px;
  height:100px;
  background:var(--red);
  transform:skewY(-3deg);
  z-index:0;
}
.hero h1{
  position:relative;
  z-index:1;
  margin:0;
  text-align:right;
  font-size:clamp(2.7rem,12.5vw,8.5rem);
  line-height:.9;
  letter-spacing:-.045em;
  font-weight:700;
  text-shadow:4px 4px 0 rgba(255,75,43,.95);
}
.ch{display:inline-block;animation:ch-rise .72s cubic-bezier(.2,.85,.25,1) both;animation-delay:calc(var(--i) * 45ms)}
.sp{white-space:pre}
@keyframes ch-rise{
  from{opacity:0;transform:translateY(64%) rotate(7deg)}
  to{opacity:1;transform:none}
}

/* 版式 */
.sheet{
  display:grid;
  grid-template-columns:250px minmax(0,1fr);
  align-items:start;
  gap:28px;
  max-width:1160px;
  margin:0 auto;
  padding:36px 20px 68px;
}

/* 侧栏 */
.rail{
  position:sticky;
  top:104px;
  padding:18px;
  background:var(--glass);
  border:var(--edge);
  border-radius:var(--radius);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.rail h2{
  margin:0 0 8px;
  font-size:clamp(1.5rem,2.4vw,1.9rem);
  line-height:1.1;
  letter-spacing:-.03em;
  word-break:break-word;
}
.subtitle{
  margin:0 0 16px;
  font-size:16px;
  line-height:1.55;
  color:#3b352a;
}
.rail-list{
  display:grid;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.rail-list a{width:100%;justify-content:flex-start}

/* 正文 */
.content-body{
  display:grid;
  gap:26px;
  counter-reset:sec;
  min-width:0;
}
.content-body > article{
  position:relative;
  counter-increment:sec;
  padding:26px 24px 26px 64px;
  background:var(--glass);
  border:var(--edge);
  border-radius:var(--radius);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  scroll-margin-top:120px;
}
.content-body > article::before{
  content:counter(sec,decimal-leading-zero);
  position:absolute;
  left:18px;
  top:24px;
  font-size:22px;
  line-height:1;
  letter-spacing:-.03em;
  color:var(--red);
}

.content-body h2{
  margin:0 0 14px;
  font-size:clamp(1.5rem,3.6vw,2.1rem);
  line-height:1.16;
  letter-spacing:-.025em;
}
.content-body h3,
.content-body h4{
  margin:24px 0 10px;
  font-size:1.2rem;
  line-height:1.3;
}
.content-body p{margin:0 0 14px}
.content-body p:last-child{margin-bottom:0}
.content-body a{
  text-decoration:underline;
  text-decoration-thickness:3px;
  text-decoration-color:var(--red);
  text-underline-offset:3px;
}
.content-body a:hover{background:var(--red);color:#fff;text-decoration:none}
.content-body ul,
.content-body ol{margin:0 0 14px;padding-left:22px}
.content-body li{margin-bottom:8px}
.content-body strong{background:linear-gradient(transparent 62%,rgba(255,75,43,.42) 62%)}
.content-body img{border:var(--edge);border-radius:var(--radius)}
.content-body blockquote{
  margin:0 0 14px;
  padding:14px 18px;
  background:rgba(255,255,255,.6);
  border-left:6px solid var(--red);
  border-radius:0 var(--radius) var(--radius) 0;
}
.content-body table{width:100%;border-collapse:collapse;margin:0 0 14px}
.content-body th,
.content-body td{border:1px solid rgba(18,18,18,.35);padding:8px 10px;text-align:left}
.content-body code{
  padding:1px 5px;
  background:rgba(18,18,18,.08);
  border-radius:4px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:16px;
}
.content-body pre{
  overflow-x:auto;
  padding:14px;
  background:var(--ink);
  color:var(--cream);
  border-radius:var(--radius);
}
.content-body pre code{background:none;color:inherit;padding:0}

/* 滚动揭示 */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .55s ease,transform .55s ease}
.reveal.in{opacity:1;transform:none}

/* 页脚 */
footer{
  background:var(--ink);
  color:var(--cream);
  border-top:8px solid var(--red);
  padding:36px 20px 44px;
}
.foot-row{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:22px;
  max-width:1160px;
  margin:0 auto;
}
.foot-mark{
  flex:0 0 auto;
  font-size:clamp(1.7rem,4.6vw,2.8rem);
  line-height:1;
  letter-spacing:-.035em;
  text-decoration:none;
  padding-bottom:6px;
  border-bottom:6px solid var(--red);
}
.foot-row nav{flex:1 1 300px;min-width:0}
.foot-row nav ol{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.foot-row nav a{
  color:var(--cream);
  background:transparent;
  border-color:rgba(244,235,216,.55);
}
.foot-row nav a:hover{background:var(--red);border-color:var(--red);color:#fff}
.copy{
  flex:0 0 auto;
  margin:0;
  font-size:16px;
  opacity:.85;
}

/* 断点 */
@media (max-width:900px){
  .topbar{
    position:static;
    grid-template-columns:1fr;
    justify-items:center;
    gap:10px;
    padding:12px;
  }
  .mark{order:-1;font-size:19px}
  .side ol{justify-content:center}
  .side a{padding:8px 13px}

  .hero{padding:38px 16px 34px}
  .hero h1{text-shadow:3px 3px 0 rgba(255,75,43,.95)}

  .sheet{grid-template-columns:1fr;gap:20px;padding:26px 16px 52px}
  .rail{position:static;top:auto;padding:16px}
  .rail-list{grid-template-columns:1fr 1fr;display:grid}
  .rail-list a{justify-content:center;text-align:center}

  .content-body > article{padding:22px 18px 22px 54px;scroll-margin-top:20px}
  .content-body > article::before{left:15px;top:22px;font-size:19px}

  .foot-row{flex-direction:column;justify-content:center;text-align:center}
  .foot-row nav{flex:1 1 auto;width:100%}
}

@media (max-width:400px){
  body{font-size:16px}
  .rail-list{grid-template-columns:1fr}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .tape-track{animation:none}
  .ch{animation:none}
  .reveal{opacity:1;transform:none;transition:none}
  .side a:hover,.rail-list a:hover{transform:none}
}

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