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

:root{
  --paper:#fafaf8;
  --ink:#1a1a1a;
  --grey:#4a4a4a;
  --soft:#f0eee7;
  --hard:#e4e0d6;
  --pad:clamp(16px,4.5vw,48px);
  --bar:58px;
}

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

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

body{
  margin:0;
  color:var(--ink);
  font-family:"Space Mono",ui-monospace,"Courier New",monospace,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.78;
  letter-spacing:.01em;
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 18% 12%,rgba(26,26,26,.045),transparent 46%),
    radial-gradient(circle at 86% 62%,rgba(26,26,26,.035),transparent 42%),
    repeating-linear-gradient(0deg,rgba(26,26,26,.035) 0 1px,transparent 1px 4px),
    repeating-linear-gradient(90deg,rgba(26,26,26,.018) 0 1px,transparent 1px 7px);
}

img{
  max-width:100%;
  height:auto;
  display:block;
  filter:grayscale(.18) contrast(1.06);
}

a{color:inherit}

p{margin:0 0 1em}

:focus-visible{outline:3px dashed var(--ink);outline-offset:3px}

.sheet{
  max-width:1120px;
  margin:0 auto;
  padding:0 var(--pad);
}

/* 顶栏 */
.mast{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:14px 0 10px;
}

.mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  min-width:44px;
  text-decoration:none;
}

.mark-img{
  width:38px;
  height:38px;
  object-fit:contain;
  filter:none;
}

.mark-txt{
  display:inline-block;
  font-size:16px;
  font-weight:700;
  letter-spacing:.12em;
  background:var(--ink);
  color:var(--paper);
  padding:5px 9px;
  border-radius:3px;
  transform:rotate(-2deg);
}

.mast-cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 16px;
  background:var(--ink);
  color:var(--paper);
  text-decoration:none;
  font-weight:700;
  font-size:16px;
  border-radius:4px;
  transform:rotate(.8deg);
  box-shadow:4px 4px 0 rgba(26,26,26,.22);
  transition:transform .1s ease-out,box-shadow .1s ease-out;
}

.mast-cta:hover{
  transform:rotate(-1.6deg) translate(-1px,-1px);
  box-shadow:6px 6px 0 rgba(26,26,26,.3);
}

/* 粘性锚点条 */
.anchors{
  position:sticky;
  top:0;
  z-index:30;
  margin:0 calc(var(--pad) * -1);
  padding:0 var(--pad);
  background:var(--paper);
  border-top:2px solid var(--ink);
  border-bottom:2px solid var(--ink);
  box-shadow:0 3px 0 rgba(26,26,26,.08);
}

.anchor-nav{
  display:flex;
  gap:6px;
  overflow-x:auto;
  scrollbar-width:none;
  padding:6px 0;
}

.anchor-nav::-webkit-scrollbar{display:none}

.anchor{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  font-size:16px;
  text-decoration:none;
  border-radius:4px;
  transition:background-color .1s linear,transform .1s ease-out;
}

.anchor:hover{
  background:var(--soft);
  transform:translateY(-1px);
}

/* 首屏 */
.hero{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:clamp(18px,4vw,44px);
  align-items:center;
  min-height:45vh;
  padding:clamp(22px,5vw,46px) 0 clamp(18px,4vw,32px);
}

.hero-h1{
  margin:0 0 14px;
  font-size:clamp(27px,4.8vw,43px);
  line-height:1.24;
  font-weight:700;
  letter-spacing:-.01em;
}

.hero-h1 span{
  background:linear-gradient(transparent 68%,rgba(26,26,26,.15) 68%);
}

.lede{
  margin:0;
  max-width:44ch;
  color:var(--grey);
  font-size:16px;
}

.shots{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:10px;
  align-items:start;
}

.shot{
  margin:0;
  background:var(--soft);
  border-radius:4px;
  overflow:hidden;
  box-shadow:6px 6px 0 rgba(26,26,26,.14);
  transition:transform .1s ease-out,box-shadow .1s ease-out;
}

.shot-a{transform:rotate(-2deg)}
.shot-b{transform:rotate(1.6deg) translateY(14px)}

.shot:hover{box-shadow:8px 8px 0 rgba(26,26,26,.2)}

.shot img{
  width:100%;
  height:100%;
  aspect-ratio:4/5;
  object-fit:cover;
  filter:grayscale(.3) contrast(1.1);
}

.shot.is-empty{
  aspect-ratio:4/5;
  background-image:repeating-linear-gradient(45deg,rgba(26,26,26,.13) 0 2px,transparent 2px 9px);
}

/* 正文区 */
.page-body{
  display:grid;
  grid-template-columns:minmax(0,1fr) 264px;
  gap:clamp(20px,4vw,48px);
  align-items:start;
  padding:6px 0 42px;
}

.prose{
  min-width:0;
  border-top:2px solid var(--ink);
  padding-top:8px;
}

.prose div{
  padding:26px 0 30px;
  border-bottom:2px dashed rgba(26,26,26,.28);
  scroll-margin-top:calc(var(--bar) + 34px);
}

.prose div:last-child{border-bottom:0}

.prose h2{
  margin:0 0 .6em;
  font-size:clamp(21px,3vw,27px);
  line-height:1.38;
  font-weight:700;
}

.prose h2 span{
  display:inline-block;
  padding-bottom:3px;
  border-bottom:3px solid var(--ink);
}

.prose h3{
  margin:1.3em 0 .5em;
  font-size:19px;
  line-height:1.5;
}

.prose p{font-size:17px}

.prose ul,.prose ol{
  margin:0 0 1em;
  padding-left:1.3em;
}

.prose li{margin:.26em 0}

.prose a{
  text-decoration:underline;
  text-decoration-style:wavy;
  text-underline-offset:3px;
}

.prose blockquote{
  margin:1.2em 0;
  padding:12px 16px;
  background:var(--soft);
  border-radius:4px;
  color:var(--grey);
}

.prose figure{margin:1.2em 0}

.prose img{border-radius:4px}

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

.prose th,.prose td{
  padding:8px;
  text-align:left;
  border-bottom:1px solid rgba(26,26,26,.2);
}

/* 侧栏 */
.rail{
  position:sticky;
  top:calc(var(--bar) + 14px);
  background:var(--soft);
  border-radius:4px;
  padding:16px;
  box-shadow:6px 6px 0 rgba(26,26,26,.1);
}

.rail-h{
  margin:0 0 10px;
  font-size:16px;
  letter-spacing:.16em;
  font-weight:700;
}

.rail-h span{
  display:inline-block;
  padding-bottom:3px;
  border-bottom:2px solid var(--ink);
}

.tick{
  display:inline-block;
  width:9px;
  height:9px;
  margin-left:7px;
  background:var(--ink);
  transform:rotate(12deg);
  vertical-align:middle;
}

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

.rail-list a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:4px 7px;
  font-size:16px;
  text-decoration:none;
  border-radius:3px;
  border-bottom:1px dashed rgba(26,26,26,.18);
  transition:transform .1s ease-out,background-color .1s linear;
}

.rail-list a:hover{
  background:var(--paper);
  transform:translateX(2px);
}

.rail-list a.on{
  background:var(--ink);
  color:var(--paper);
  border-bottom-color:transparent;
}

/* 页脚 */
.foot{
  margin-top:18px;
  border-top:3px solid var(--ink);
  padding:26px 0 34px;
}

.foot-cta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:20px 18px;
  background:var(--ink);
  color:var(--paper);
  border-radius:4px;
  transform:rotate(-.6deg);
}

.cta-h{
  margin:0;
  font-size:clamp(19px,3vw,24px);
  letter-spacing:.06em;
  font-weight:700;
}

.cta-h span{
  display:inline-block;
  padding-bottom:3px;
  border-bottom:2px solid var(--paper);
}

.cta-h .tick{background:var(--paper)}

.cta-big{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  border-radius:4px;
  transition:transform .1s ease-out,box-shadow .1s ease-out;
}

.cta-big:hover{
  transform:translate(-2px,-2px);
  box-shadow:5px 5px 0 rgba(250,250,248,.36);
}

.foot-bar{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:start;
  gap:18px;
  margin-top:20px;
  padding-top:20px;
  border-top:2px dashed rgba(26,26,26,.3);
}

.foot-nav dl{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:0 14px;
  margin:0;
}

.foot-nav dt{
  width:1.2em;
  font-size:16px;
  color:var(--grey);
}

.foot-nav dd{
  margin:0 0 6px;
}

.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  font-size:16px;
  text-decoration:none;
  border-bottom:2px solid transparent;
}

.foot-nav a:hover{border-bottom-color:var(--ink)}

.copy{
  margin:0;
  font-size:16px;
  color:var(--grey);
  white-space:nowrap;
}

.totop{
  position:fixed;
  right:14px;
  bottom:14px;
  z-index:40;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 14px;
  background:var(--ink);
  color:var(--paper);
  font-size:16px;
  text-decoration:none;
  border-radius:4px;
  box-shadow:4px 4px 0 rgba(26,26,26,.25);
}

/* 窄屏 */
@media (max-width:860px){
  .hero{
    grid-template-columns:1fr;
    min-height:0;
  }
  .shots{max-width:420px}
  .page-body{grid-template-columns:1fr}
  .rail{position:static}
  .foot-bar{grid-template-columns:1fr}
  .copy{white-space:normal}
}

@media (max-width:420px){
  .hero-h1{font-size:26px}
  .shot-b{transform:rotate(1.2deg) translateY(8px)}
  .anchors{margin:0 calc(var(--pad) * -1)}
  .foot-cta{padding:16px 14px}
}

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

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