@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&display=swap');

:root{
  --white:#ffffff;
  --mist:#f5f5f5;
  --ink:#1f1f1f;
  --soft:#d8d8d8;
  --grey:#6a6a6a;
  --r:10px;
  --dock:78px;
  --sh-sm:0 2px 6px rgba(31,31,31,.07);
  --sh-md:0 10px 24px rgba(31,31,31,.11);
  --sh-lg:0 20px 46px rgba(31,31,31,.15);
  --sh-xl:0 30px 68px rgba(31,31,31,.19);
}

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

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

body{
  margin:0;
  background:var(--mist);
  color:var(--ink);
  font-family:'Space Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.72;
  overflow-x:hidden;
}

h1,h2,h3,h4{font-weight:700}
a{color:inherit}

hr{
  border:0;
  border-top:1px solid var(--ink);
  height:0;
  margin:12px 0 20px;
}

.deck{position:relative}

/* ---------- 角落品牌 ---------- */
.toprow{
  position:fixed;
  top:14px;
  left:14px;
  z-index:90;
}

.mark{
  display:grid;
  place-items:center;
  width:50px;
  height:50px;
  border:1px solid var(--ink);
  border-radius:var(--r);
  background:var(--white);
  color:var(--ink);
  text-decoration:none;
  box-shadow:var(--sh-md);
  transition:transform .2s ease,background .2s ease,color .2s ease;
}

.mark:hover{
  transform:translate3d(0,-3px,0);
  background:var(--ink);
  color:var(--white);
}

.mark svg{
  width:24px;
  height:24px;
  fill:none;
  stroke:currentColor;
  stroke-width:1.5;
  stroke-linejoin:round;
}

.mark-img{width:26px;height:26px;object-fit:contain;display:block}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  min-height:100vh;
  min-height:100svh;
  display:flex;
  align-items:flex-end;
  justify-content:flex-end;
  background:var(--white);
  padding:clamp(96px,15vh,160px) clamp(20px,6vw,86px) calc(var(--dock) + 76px);
  text-align:right;
}

.hero-art{position:absolute;inset:0;z-index:0;pointer-events:none}

.plate{
  position:absolute;
  display:block;
  border:1px solid var(--ink);
  border-radius:var(--r);
  transform:translate3d(0,var(--py,0px),0) rotate(var(--rot,0deg));
  will-change:transform;
}

.p1{
  width:150px;height:150px;
  left:7%;top:15%;
  --rot:-9deg;
  box-shadow:var(--sh-md);
}

.p2{
  width:300px;height:300px;
  left:22%;top:38%;
  --rot:6deg;
  background:var(--mist);
  box-shadow:var(--sh-lg);
}

.p3{
  width:118px;height:118px;
  right:9%;top:11%;
  --rot:15deg;
  background:var(--white);
  box-shadow:var(--sh-xl);
}

.hero-inner{position:relative;z-index:3;max-width:min(26ch,100%)}

.hero h1{
  margin:0;
  font-size:clamp(2.05rem,8.2vw,5.6rem);
  line-height:1.04;
  letter-spacing:-.03em;
  word-break:break-word;
  text-wrap:balance;
}

.hero-sub{
  margin:20px 0 0 auto;
  max-width:46ch;
  color:var(--grey);
  font-size:16px;
  line-height:1.65;
}

.hero-cut{
  position:absolute;
  left:0;right:0;bottom:0;
  height:16px;
  background:var(--ink);
  transform:skewY(-1.1deg);
  transform-origin:right bottom;
  z-index:2;
  box-shadow:var(--sh-md);
}

/* ---------- 主容器 ---------- */
.wrap{
  position:relative;
  z-index:5;
  max-width:1180px;
  margin:-44px auto 0;
  padding:0 clamp(14px,4vw,40px);
}

.panel{
  display:grid;
  grid-template-columns:minmax(0,1fr) 262px;
  gap:clamp(20px,3vw,42px);
  align-items:start;
  background:var(--white);
  border:1px solid var(--ink);
  border-radius:var(--r);
  padding:clamp(20px,3.6vw,44px);
}

.prose{max-width:74ch;min-width:0;overflow-wrap:break-word}

.prose section[id]{scroll-margin-top:calc(var(--dock) + 64px)}

.prose section + section{
  margin-top:60px;
  padding-top:52px;
  border-top:1px dashed var(--soft);
}

.prose h2{
  margin:0 0 6px;
  font-size:clamp(1.32rem,2.9vw,1.85rem);
  line-height:1.26;
  letter-spacing:-.015em;
}

.prose h3{
  margin:28px 0 6px;
  font-size:1.08rem;
  letter-spacing:-.01em;
}

.prose p{margin:0 0 18px}
.prose ul,.prose ol{margin:0 0 18px;padding-left:1.35em}
.prose li{margin:6px 0}
.prose strong{background:linear-gradient(transparent 64%,#e7e7e7 64%)}
.prose a{text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.prose a:hover{background:var(--ink);color:var(--white);text-decoration:none}

.prose img{
  display:block;
  max-width:100%;
  height:auto;
  margin:20px 0;
  border:1px solid var(--ink);
  border-radius:var(--r);
}

.prose blockquote{
  margin:22px 0;
  padding:14px 18px;
  border-left:4px solid var(--ink);
  border-radius:0 var(--r) var(--r) 0;
  background:var(--mist);
}

.prose blockquote p:last-child{margin-bottom:0}

.prose table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 20px;
  font-size:16px;
}

.prose th,.prose td{
  border:1px solid var(--soft);
  padding:8px 10px;
  text-align:left;
  vertical-align:top;
}

.prose th{background:var(--mist)}
.prose code{font-family:inherit;background:var(--mist);padding:1px 5px;border-radius:4px}

/* ---------- 右侧栏 ---------- */
.rail{min-width:0}

.rail-card{
  position:sticky;
  top:86px;
  background:var(--mist);
  border:1px solid var(--ink);
  border-radius:var(--r);
  padding:18px 18px 22px;
  z-index:2;
}

.rail-card h2{
  margin:0;
  font-size:16px;
  letter-spacing:.14em;
}

.rail-card hr{margin:8px 0 14px}

.rail-list{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:rail;
}

.rail-list li + li{border-top:1px solid var(--soft)}

.rail-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:8px 0;
  font-size:16px;
  text-decoration:none;
}

.rail-list a::before{
  counter-increment:rail;
  content:counter(rail,decimal-leading-zero);
  font-size:13px;
  color:var(--grey);
  letter-spacing:.08em;
}

.rail-list a:hover{text-decoration:underline;text-underline-offset:3px}

/* ---------- 页脚 ---------- */
.base{
  position:relative;
  z-index:3;
  margin-top:72px;
  background:var(--ink);
  color:var(--white);
  padding:58px clamp(18px,5vw,72px) calc(var(--dock) + 48px);
  display:grid;
  grid-template-columns:1.55fr 1fr;
  gap:38px 54px;
}

.base section{min-width:0}

.base h2{
  margin:0;
  font-size:16px;
  letter-spacing:.14em;
}

.base hr{border-top-color:#4d4d4d;margin:8px 0 16px}
.base a{color:var(--white)}

.base .mark{
  border-color:#5c5c5c;
  background:transparent;
  color:var(--white);
  box-shadow:none;
  margin-bottom:16px;
}

.base .mark:hover{background:var(--white);color:var(--ink);border-color:var(--white)}

.base-name{margin:0;font-size:20px;letter-spacing:.06em}

.base-desc{
  margin:12px 0 0;
  color:#b9b9b9;
  font-size:16px;
  max-width:42ch;
}

.base-links ol{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:2px 16px;
}

.base-links a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 0;
  font-size:16px;
  text-decoration:none;
}

.base-links a:hover{text-decoration:underline;text-underline-offset:4px}

.base-form{grid-column:1 / -1}

.sub{
  display:block;
  max-width:560px;
}

.sub label{
  display:block;
  font-size:16px;
  color:#b9b9b9;
  margin-bottom:8px;
}

.sub-row{display:flex;flex-wrap:wrap;gap:10px}

.sub input{
  flex:1 1 240px;
  min-height:48px;
  padding:11px 14px;
  border:1px solid #5c5c5c;
  border-radius:var(--r);
  background:#2b2b2b;
  color:var(--white);
  font:inherit;
  font-size:16px;
}

.sub input:focus{outline:2px solid var(--white);outline-offset:2px}

.sub button{
  min-height:48px;
  padding:11px 26px;
  border:1px solid var(--white);
  border-radius:var(--r);
  background:var(--white);
  color:var(--ink);
  font:inherit;
  font-size:16px;
  font-weight:700;
  cursor:pointer;
  transition:background .2s ease,color .2s ease,transform .2s ease;
}

.sub button:hover{background:transparent;color:var(--white);transform:translate3d(0,-2px,0)}

.colophon{
  grid-column:1 / -1;
  margin:0;
  padding-top:24px;
  border-top:1px solid #3d3d3d;
  text-align:center;
  font-size:16px;
  color:#a6a6a6;
}

/* ---------- 底部固定条 ---------- */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:80;
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-top:1px solid var(--ink);
  box-shadow:0 -12px 36px rgba(31,31,31,.12);
  padding:8px max(8px,env(safe-area-inset-left)) max(8px,env(safe-area-inset-bottom));
}

.dock ol{
  list-style:none;
  display:flex;
  gap:6px;
  margin:0 auto;
  padding:2px 4px;
  max-width:1180px;
  overflow-x:auto;
  scrollbar-width:none;
  -webkit-overflow-scrolling:touch;
}

.dock ol::-webkit-scrollbar{display:none}

.dock li{flex:0 0 auto}

.dock a{
  display:flex;
  align-items:center;
  gap:7px;
  min-height:46px;
  padding:10px 13px;
  border:1px solid var(--ink);
  border-radius:var(--r);
  background:var(--white);
  color:var(--ink);
  font-size:16px;
  white-space:nowrap;
  text-decoration:none;
  transition:transform .18s ease,background .18s ease,color .18s ease;
}

.dock a:hover,.dock a.on{
  background:var(--ink);
  color:var(--white);
  transform:translate3d(0,-3px,0);
}

.dock svg{
  width:13px;
  height:13px;
  flex:0 0 auto;
  fill:none;
  stroke:currentColor;
  stroke-width:1.6;
  stroke-linejoin:round;
}

/* ---------- 滚动显现 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translate3d(0,22px,0);
  transition:opacity .62s ease,transform .62s cubic-bezier(.22,.7,.3,1);
}

.js [data-reveal].in{
  opacity:1;
  transform:none;
}

/* ---------- 断点 ---------- */
@media (max-width:900px){
  .panel{grid-template-columns:minmax(0,1fr)}
  .rail-card{position:static}
  .base{grid-template-columns:1fr}
  .base-form{grid-column:auto}
  .colophon{grid-column:auto}
}

@media (max-width:560px){
  body{font-size:16px}
  .hero{padding-top:104px;text-align:right}
  .p1{width:104px;height:104px;left:5%;top:12%}
  .p2{width:190px;height:190px;left:16%;top:44%}
  .p3{width:86px;height:86px;right:8%;top:9%}
  .hero-sub{max-width:100%}
  .wrap{margin-top:-32px}
  .base-links ol{grid-template-columns:1fr 1fr}
  .colophon{font-size:15px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js [data-reveal]{opacity:1;transform:none;transition:none}
  .plate{transform:rotate(var(--rot,0deg))}
  .dock a:hover,.dock a.on,.mark:hover,.sub button:hover{transform:none}
}

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