:root{
  --paper:#fafaf8;
  --wash:#f1efe9;
  --grey:#4a4a4a;
  --ink:#1a1a1a;
  --line:3px;
  --font:"Space Grotesk",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",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:1.7;
  color:var(--ink);
  background-color:var(--paper);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='0.055'/%3E%3C/svg%3E");
  padding-bottom:120px;
}

img{max-width:100%;display:block}
a{color:var(--ink)}

h1,h2,h3{
  font-family:var(--font);
  font-weight:700;
  line-height:1.14;
  letter-spacing:-.02em;
  margin:0;
}

p{margin:0 0 14px}

.sr{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

/* ---------- 头部大图 ---------- */
.hero{
  position:relative;
  isolation:isolate;
  display:grid;
  place-items:center;
  min-height:70vh;
  min-height:70svh;
  overflow:hidden;
  background:repeating-linear-gradient(45deg,#eceae4 0 12px,#f4f2ec 12px 24px);
}

.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  z-index:0;
  filter:grayscale(1) contrast(1.18) brightness(.92);
}

.hero-veil{
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(180deg,rgba(26,26,26,.05),rgba(26,26,26,.66));
}

.hero--bare .hero-veil{background:none}

.hero-txt{
  position:relative;
  z-index:2;
  padding:34px 20px 44px;
  text-align:center;
  color:var(--paper);
}

.hero--bare .hero-txt{color:var(--ink)}

.hero-brand{
  margin:0 0 12px;
  font-size:16px;
  letter-spacing:.26em;
  opacity:.85;
}

.hero h1{
  margin:0 auto;
  max-width:16ch;
  font-size:clamp(2rem,8vw,4.5rem);
  letter-spacing:-.035em;
  text-shadow:0 2px 0 rgba(26,26,26,.28);
}

.hero--bare h1{text-shadow:none}

.slash{
  position:absolute;
  left:-8%;
  right:-8%;
  bottom:-12px;
  height:26px;
  z-index:3;
  background:var(--ink);
  transform:rotate(-1.4deg);
}

/* ---------- 布局 ---------- */
main{padding:42px 0 0}

.wrap{
  max-width:1080px;
  margin:0 auto;
  padding:0 18px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 264px;
  gap:36px;
  align-items:start;
}

.board{min-width:0}

/* ---------- 正文 ---------- */
.prose{
  background:#fffdf9;
  border:var(--line) solid var(--ink);
  border-radius:10px;
  padding:24px 20px 10px;
  overflow-wrap:anywhere;
}

.prose > section{
  scroll-margin-top:20px;
  padding:4px 0 12px;
}

.prose > section + section{
  margin-top:22px;
  padding-top:22px;
  border-top:2px dashed #b9b5ab;
}

.prose h2{
  font-size:clamp(1.35rem,4.2vw,2rem);
  margin:0 0 4px;
}

.prose h3{
  font-size:clamp(1.1rem,3.4vw,1.35rem);
  margin:18px 0 4px;
}

.prose hr{
  border:0;
  height:8px;
  margin:4px 0 16px;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='8'%3E%3Cpath d='M0 5 Q15 1 30 4 T60 4 T90 4 T120 3' fill='none' stroke='%231a1a1a' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") repeat-x left center/120px 8px;
}

.prose ul,.prose ol{padding-left:1.25em;margin:0 0 14px}
.prose li{margin-bottom:6px}

.prose a{
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}

.prose strong{
  background:linear-gradient(transparent 60%,#e6e3da 60%);
  font-weight:700;
}

.prose img{
  width:100%;
  height:auto;
  margin:12px 0;
  border:var(--line) solid var(--ink);
  border-radius:10px;
  filter:grayscale(1) contrast(1.06);
}

.prose blockquote{
  margin:0 0 16px;
  padding:10px 14px;
  border-left:6px solid var(--ink);
  background:#f6f4ee;
  color:var(--grey);
}

.prose table{width:100%;border-collapse:collapse;font-size:16px}
.prose th,.prose td{border:2px solid var(--ink);padding:8px;text-align:left}

/* ---------- 侧栏 ---------- */
.rail{
  position:sticky;
  top:20px;
  border:var(--line) solid var(--ink);
  border-radius:10px;
  background:#fff;
  padding:16px 16px 10px;
}

.rail h2{font-size:17px;letter-spacing:.08em}

.rail hr{
  border:0;
  height:8px;
  margin:8px 0 6px;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='8'%3E%3Cpath d='M0 5 Q15 1 30 4 T60 4 T90 4 T120 3' fill='none' stroke='%234a4a4a' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E") repeat-x left center/120px 8px;
}

.rail ul{list-style:none;margin:6px 0 0;padding:0}

.rail li + li{border-top:1px dashed #cbc7bd}

.rail a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 2px;
  font-size:16px;
  text-decoration:none;
}

.rail a:hover,.rail a:focus-visible{
  text-decoration:underline;
  text-decoration-thickness:2px;
  text-underline-offset:4px;
}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:60px;
  padding:26px 18px 24px;
  border-top:4px solid var(--ink);
  background:var(--wash);
}

.foot-form{max-width:1080px;margin:0 auto 24px}

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

.sub input{
  flex:1 1 220px;
  min-height:46px;
  padding:10px 14px;
  font:inherit;
  font-size:16px;
  color:var(--ink);
  background:#fff;
  border:var(--line) solid var(--ink);
  border-radius:10px;
}

.sub button{
  min-height:46px;
  padding:10px 24px;
  font:inherit;
  font-size:16px;
  font-weight:700;
  color:var(--paper);
  background:var(--ink);
  border:var(--line) solid var(--ink);
  border-radius:10px;
  cursor:pointer;
}

.sub button:hover{background:var(--grey);border-color:var(--grey)}

.foot-cols{
  max-width:1080px;
  margin:0 auto;
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}

.foot dl{margin:0}

.foot dt{
  font-size:16px;
  font-weight:700;
  letter-spacing:.08em;
  padding-bottom:5px;
  border-bottom:2px solid var(--ink);
}

.foot dd{
  margin:8px 0 16px;
  font-size:16px;
  color:var(--grey);
}

.foot-links{list-style:none;margin:0;padding:0;columns:2;column-gap:14px}

.foot-links a{
  display:inline-block;
  min-height:40px;
  padding:8px 0;
  text-decoration:none;
  border-bottom:2px solid transparent;
}

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

.foot-base{
  max-width:1080px;
  margin:18px auto 0;
  padding-top:12px;
  border-top:2px solid var(--ink);
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  align-items:center;
  justify-content:space-between;
}

.foot-base p{margin:0;font-size:16px}

.foot-base a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 4px;
  text-decoration:none;
  border-bottom:2px solid var(--ink);
}

/* ---------- 底部固定条 ---------- */
.dock{
  position:fixed;
  inset:auto 0 0 0;
  z-index:40;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:4px;
  padding:8px 14px calc(8px + env(safe-area-inset-bottom,0px));
  background:#f7f5ef;
  border-top:4px solid var(--ink);
}

.dock-brand{
  order:2;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:8px 16px;
  font-size:16px;
  font-weight:700;
  text-decoration:none;
  background:#fff;
  border:var(--line) solid var(--ink);
  border-radius:10px;
  transform:rotate(-1deg);
}

.dock-brand .mark{width:22px;height:22px;object-fit:cover;border-radius:4px}

.dock-nav{display:contents}

.dock-group{
  display:flex;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}

.dock-group--l{order:1}
.dock-group--r{order:3}

.dock-group a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:8px 9px;
  font-size:16px;
  text-decoration:none;
  border-bottom:2px solid transparent;
}

.dock-group a:hover,.dock-group a:focus-visible{border-bottom-color:var(--ink)}

/* ---------- 滚动显现 ---------- */
.js .prose > section{
  transition:opacity .32s linear,transform .32s ease-out;
}

.js .prose > section:not(.in){
  opacity:0;
  transform:translateY(10px);
}

.js .prose > section:nth-child(2n):not(.in){transition-delay:.05s}

/* ---------- 中等屏 ---------- */
@media (min-width:961px){
  .rail{transform:rotate(.7deg)}
}

@media (max-width:960px){
  .wrap{grid-template-columns:minmax(0,1fr);gap:28px}
  .rail{position:static;transform:none}
}

/* ---------- 窄屏 ---------- */
@media (max-width:760px){
  body{padding-bottom:140px}

  main{padding-top:28px}

  .wrap{padding:0 14px;gap:22px}

  .hero{min-height:62vh;min-height:62svh}
  .hero-txt{padding:26px 16px 40px}

  .prose{padding:18px 14px 6px;border-radius:10px}

  .foot{padding:22px 14px 20px}

  .foot-cols{grid-template-columns:1fr;gap:18px}

  .dock{
    display:grid;
    justify-items:center;
    gap:8px;
    padding-inline:0;
  }

  .dock-brand{order:0;transform:rotate(-.8deg)}

  .dock-nav{
    display:flex;
    gap:2px;
    width:100%;
    overflow-x:auto;
    padding:0 10px;
    scrollbar-width:thin;
  }

  .dock-group{flex:0 0 auto}
}

@media (max-width:400px){
  .hero h1{font-size:clamp(1.75rem,9vw,2.4rem)}
  .foot-links{columns:1}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important;animation:none !important}
  .js .prose > section:not(.in){opacity:1;transform:none}
}

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