@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&family=VT323&display=swap');

:root{
  --mint:#b4fde1;
  --blue:#add8e6;
  --ink:#172620;
  --mint-d:#7fdcbe;
  --blue-d:#8ec3d4;
  --paper:#f6fffb;
  --line:3px solid var(--ink);
  --r-lg:26px;
  --r-md:18px;
  --r-sm:12px;
  --sh:4px 4px 0 var(--ink), 0 14px 26px -16px rgba(23,38,32,.7);
  --sh-in:inset -3px -4px 10px rgba(23,38,32,.13), inset 3px 4px 10px rgba(255,255,255,.9);
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
}

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

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

body{
  margin:0;
  font-family:var(--font);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:
    radial-gradient(1100px 560px at 10% -10%, var(--mint), transparent 62%),
    radial-gradient(880px 500px at 94% 4%, var(--blue), transparent 58%),
    var(--paper);
  overflow-x:hidden;
}

.pixel{
  font-family:'VT323','Press Start 2P',ui-monospace,monospace;
  font-style:normal;
  font-size:13px;
  letter-spacing:.08em;
}

a:focus-visible,
summary:focus-visible{
  outline:3px solid #0f5f47;
  outline-offset:3px;
}

.skip{
  position:absolute;
  left:12px;
  top:-70px;
  z-index:80;
  padding:10px 18px;
  border:var(--line);
  border-radius:14px;
  background:#fff;
  color:var(--ink);
  text-decoration:none;
  font-weight:800;
  transition:top .18s ease-out;
}
.skip:focus{top:10px}

/* 顶栏 */
.top{
  position:relative;
  display:flex;
  align-items:center;
  gap:10px;
  max-width:1180px;
  margin:0 auto;
  padding:12px clamp(12px,3vw,28px);
}

.mark{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:52px;
  height:52px;
  overflow:hidden;
  border:var(--line);
  border-radius:16px;
  background:linear-gradient(160deg,var(--mint),var(--blue));
  box-shadow:var(--sh), var(--sh-in);
  color:var(--ink);
  text-decoration:none;
  transition:transform .18s cubic-bezier(.34,1.56,.64,1);
}
.mark:hover{transform:rotate(-5deg) scale(1.06)}
.mark img{display:block;width:100%;height:100%;object-fit:cover}
.mark-ch{font-weight:900;font-size:22px}

.nav{margin-left:auto}
.nav>summary{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:46px;
  padding:8px 18px;
  list-style:none;
  cursor:pointer;
  border:var(--line);
  border-radius:999px;
  background:#fff;
  box-shadow:var(--sh);
  font-size:16px;
  font-weight:800;
}
.nav>summary::-webkit-details-marker{display:none}
.bars{
  width:18px;
  height:3px;
  border-radius:2px;
  background:var(--ink);
  box-shadow:0 -6px 0 var(--ink), 0 6px 0 var(--ink);
}

.nav menu{
  margin:0;
  padding:0;
  list-style:none;
  gap:6px;
}

.nav menu a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:8px 15px;
  border:2px solid transparent;
  border-radius:999px;
  background:rgba(255,255,255,.72);
  color:var(--ink);
  font-size:16px;
  text-decoration:none;
  transition:background .16s ease-out, border-color .16s ease-out, transform .16s ease-out;
}
.nav menu a:hover{
  background:var(--mint);
  border-color:var(--ink);
  transform:translateX(2px);
}

.cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:9px 20px;
  border:var(--line);
  border-radius:999px;
  background:linear-gradient(180deg,var(--mint),var(--mint-d));
  color:var(--ink);
  font-weight:800;
  font-size:16px;
  text-decoration:none;
  box-shadow:var(--sh), var(--sh-in);
  transition:transform .16s ease-out, box-shadow .16s ease-out;
}
.cta:hover{transform:translateY(-2px)}
.cta:active{transform:translate(3px,3px);box-shadow:2px 2px 0 var(--ink)}

/* 二级锚点条 */
.strip{
  position:sticky;
  top:0;
  z-index:40;
  border-block:3px solid var(--ink);
  background:rgba(246,255,251,.9);
  backdrop-filter:blur(10px);
}
.strip-in{
  display:flex;
  gap:8px;
  max-width:1180px;
  margin:0 auto;
  padding:8px clamp(12px,3vw,28px);
  overflow-x:auto;
  scrollbar-width:thin;
}
.strip-in a{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:42px;
  padding:6px 15px;
  border:2px solid var(--ink);
  border-radius:999px;
  background:#fff;
  color:var(--ink);
  font-size:16px;
  text-decoration:none;
  box-shadow:2px 2px 0 rgba(23,38,32,.55);
  transition:background .16s ease-out, transform .16s ease-out;
}
.strip-in a:hover{background:var(--blue);transform:translateY(-2px)}

/* 主体 */
main{
  max-width:1180px;
  margin:0 auto;
  padding:clamp(16px,3vw,32px) clamp(12px,3vw,28px) 40px;
}

/* 首屏 */
.hero{
  position:relative;
  display:grid;
  gap:clamp(16px,2.5vw,34px);
  grid-template-columns:1fr;
  align-items:center;
  margin-bottom:clamp(20px,4vw,42px);
  padding:clamp(16px,3vw,34px);
  overflow:hidden;
  border:4px solid var(--ink);
  border-radius:var(--r-lg) var(--r-lg) 44px 44px;
  background:linear-gradient(155deg,#ffffff,#ecfff7 52%,var(--blue) 100%);
  box-shadow:8px 8px 0 rgba(23,38,32,.9), 0 22px 44px -26px rgba(23,38,32,.85), var(--sh-in);
}

.hero-art{
  margin:0;
  overflow:hidden;
  border:var(--line);
  border-radius:var(--r-md);
  background:linear-gradient(150deg,var(--mint),var(--blue));
  box-shadow:4px 4px 0 var(--ink);
  aspect-ratio:16/10;
}
.hero-art img{display:block;width:100%;height:100%;object-fit:cover}

.blob{
  display:block;
  width:100%;
  height:100%;
  min-height:170px;
  background:
    radial-gradient(closest-side at 32% 28%, #ffffff, transparent 72%),
    radial-gradient(closest-side at 72% 72%, var(--mint), transparent 70%),
    linear-gradient(150deg,var(--mint),var(--blue));
}

.hero-copy{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap:14px;
  text-align:right;
}

h1{
  margin:0;
  font-size:clamp(26px,4.4vw,48px);
  line-height:1.24;
  font-weight:900;
  letter-spacing:.01em;
}

.lede{
  margin:0;
  max-width:46ch;
  font-size:17px;
  line-height:1.72;
  color:#26403a;
}

.hero-go{margin:0}

.band{
  position:absolute;
  left:-8%;
  right:-8%;
  bottom:-6px;
  height:20px;
  border-top:3px solid var(--ink);
  background:var(--blue-d);
  transform:skewY(-1.8deg);
}

/* 正文 + 侧栏 */
.split{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(18px,3vw,34px);
  align-items:start;
}

.rail{
  order:1;
  padding:16px;
  border:var(--line);
  border-radius:var(--r-md);
  background:#fff;
  box-shadow:var(--sh), var(--sh-in);
}
.rail h2{
  margin:0 0 10px;
  font-size:18px;
  line-height:1.4;
}
.rail ol{
  display:grid;
  gap:5px;
  margin:0;
  padding:0;
  list-style:none;
}
.rail a{
  display:flex;
  align-items:center;
  gap:9px;
  min-height:42px;
  padding:6px 10px;
  border-radius:12px;
  color:var(--ink);
  font-size:16px;
  text-decoration:none;
  transition:background .16s ease-out;
}
.rail a:hover{background:var(--mint)}

/* 正文排版 */
.prose>section{
  margin-bottom:clamp(18px,3vw,30px);
  padding:clamp(16px,2.6vw,30px);
  border:3px solid var(--ink);
  border-bottom:9px solid var(--ink);
  border-radius:var(--r-md);
  background:#fff;
  box-shadow:5px 5px 0 rgba(23,38,32,.85), var(--sh-in);
  scroll-margin-top:92px;
}

.prose h2{
  display:flex;
  gap:10px;
  align-items:baseline;
  margin:0 0 14px;
  font-size:clamp(21px,2.6vw,28px);
  line-height:1.36;
  font-weight:900;
}
.prose h2>span{
  padding-bottom:2px;
  border-radius:4px;
  background:linear-gradient(transparent 64%, var(--mint) 64%);
}
.prose h3{
  margin:22px 0 10px;
  font-size:19px;
  line-height:1.45;
  font-weight:800;
}
.prose h3>span{
  padding-bottom:2px;
  border-radius:4px;
  background:linear-gradient(transparent 70%, var(--blue) 70%);
}
.prose p{margin:0 0 14px}
.prose p:last-child{margin-bottom:0}
.prose ul,
.prose ol{margin:0 0 14px;padding-left:1.4em}
.prose li{margin-bottom:7px}
.prose a{
  color:#0d5c45;
  font-weight:700;
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.prose a:hover{background:var(--mint)}
.prose strong{font-weight:800}
.prose blockquote{
  margin:0 0 16px;
  padding:12px 16px;
  border:2px solid var(--ink);
  border-left-width:8px;
  border-radius:var(--r-sm);
  background:#f2fffa;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose figure{
  margin:0 0 16px;
  overflow:hidden;
  border:var(--line);
  border-radius:14px;
  box-shadow:3px 3px 0 rgba(23,38,32,.5);
}
.prose img{display:block;width:100%;height:auto}
.prose table{
  width:100%;
  margin:0 0 16px;
  border-collapse:collapse;
  font-size:16px;
}
.prose th,
.prose td{
  padding:9px 11px;
  border:2px solid var(--ink);
  text-align:left;
  vertical-align:top;
}
.prose th{background:var(--mint)}
.prose code{
  padding:1px 6px;
  border-radius:6px;
  background:#e9fff7;
  font-size:15px;
}

/* 尾部区块 */
.outro{
  display:grid;
  grid-template-columns:1fr;
  gap:18px;
  margin-top:clamp(18px,3vw,30px);
}
.outro-art{
  margin:0;
  min-height:170px;
  overflow:hidden;
  border:var(--line);
  border-radius:var(--r-md);
  background:linear-gradient(140deg,var(--blue),var(--mint));
  box-shadow:var(--sh);
}
.outro-art img{display:block;width:100%;height:100%;object-fit:cover}

.tile{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:10px;
  padding:18px;
  border:var(--line);
  border-radius:var(--r-md);
  background:linear-gradient(160deg,var(--mint),#ffffff);
  box-shadow:var(--sh), var(--sh-in);
}
.tile h2{margin:0;font-size:19px;line-height:1.4}
.tile h2>span{
  padding-bottom:2px;
  background:linear-gradient(transparent 64%, var(--blue) 64%);
}
.tile-p{margin:0}

.btn{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:9px 22px;
  border:var(--line);
  border-radius:999px;
  background:linear-gradient(180deg,var(--mint),var(--mint-d));
  color:var(--ink);
  font-weight:800;
  font-size:16px;
  text-decoration:none;
  box-shadow:var(--sh), var(--sh-in);
  transition:transform .16s ease-out, box-shadow .16s ease-out;
}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translate(3px,3px);box-shadow:2px 2px 0 var(--ink)}
.btn.ghost{background:#fff}

.link{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  color:var(--ink);
  font-weight:800;
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:4px;
}

/* 页脚 */
.foot{
  display:grid;
  grid-template-columns:1fr auto;
  align-items:end;
  gap:8px 20px;
  max-width:1180px;
  margin:32px auto 0;
  padding:24px clamp(12px,3vw,28px) 42px;
  border-top:4px solid var(--ink);
  background:linear-gradient(180deg,rgba(255,255,255,0),rgba(180,253,225,.55));
}
.f-brand{
  grid-column:1/-1;
  margin:0;
  font-size:clamp(38px,9vw,92px);
  line-height:.98;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--ink);
}
.f-copy{
  grid-column:1;
  padding-bottom:6px;
  font-size:16px;
}
.f-links{
  grid-column:2;
  justify-self:end;
  display:flex;
  gap:14px;
  margin:0;
}
.f-links a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 4px;
  border-bottom:3px solid var(--mint-d);
  color:var(--ink);
  font-weight:800;
  font-size:16px;
  text-decoration:none;
}
.f-links a:hover{border-bottom-color:var(--ink)}

/* 动效 */
@keyframes rise{
  from{opacity:0;transform:translateY(18px)}
  to{opacity:1;transform:none}
}
.prose>section,
.rail,
.tile,
.outro-art,
.hero-art,
.hero-copy{
  animation:rise .55s cubic-bezier(.34,1.56,.64,1) both;
}
.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}
.strip-in a{animation:rise .45s cubic-bezier(.34,1.56,.64,1) both}
.strip-in a:nth-child(2){animation-delay:.04s}
.strip-in a:nth-child(3){animation-delay:.08s}
.strip-in a:nth-child(4){animation-delay:.12s}
.strip-in a:nth-child(5){animation-delay:.16s}
.strip-in a:nth-child(6){animation-delay:.2s}
.strip-in a:nth-child(7){animation-delay:.24s}

/* 断点 */
@media (min-width:900px){
  .nav{margin-left:0}
  .nav>summary{display:none}
  .nav menu{display:flex;flex-wrap:wrap}
  .hero{grid-template-columns:1.08fr .92fr;min-height:70vh}
  .cta{margin-left:auto}
}

@media (max-width:899px){
  .nav{position:relative}
  .nav menu{display:none}
  .nav[open] menu{
    display:grid;
    position:absolute;
    right:0;
    top:calc(100% + 10px);
    z-index:50;
    min-width:min(78vw,300px);
    padding:12px;
    border:var(--line);
    border-radius:20px;
    background:#fff;
    box-shadow:var(--sh);
  }
  .hero-copy{order:-1;align-items:flex-start;text-align:left}
  .hero-copy .lede{max-width:none}
}

@media (min-width:760px){
  .outro{grid-template-columns:1.25fr 1fr;align-items:stretch}
}

@media (min-width:960px){
  .split{grid-template-columns:minmax(0,1fr) 278px}
  .rail{position:sticky;top:78px}
}

@media (min-width:1200px){
  .hero{border-radius:36px 36px 52px 52px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-delay:0s !important;
    transition-duration:.001ms !important;
  }
}

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