@import url('https://fonts.googleapis.com/css2?family=Baloo+2:wght@400;500;600;700&family=Comic+Neue:wght@300;400;700&display=swap');

:root{
  --ink:#000000;
  --paper:#ffffff;
  --mute:rgba(0,0,0,.62);
  --hair:rgba(0,0,0,.16);
  --radius:28px;
  --dock:132px;
  --sans:"Baloo 2","Comic Neue",system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --serif:Georgia,"Songti SC","Noto Serif SC","Source Han Serif SC","SimSun",serif;
}

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

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

body{
  margin:0;
  padding-bottom:calc(var(--dock) + env(safe-area-inset-bottom));
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:17px;
  line-height:1.85;
  overflow-x:hidden;
}

img{display:block;max-width:100%;height:auto}

a{color:var(--ink)}

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

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

.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 16px;
}

/* ---- hero ---- */
.hero{padding-top:16px}

.hero-in{
  display:grid;
  gap:1.1rem;
  grid-template-areas:"txt" "fig";
  align-items:center;
  min-height:70vh;
  padding-bottom:1.2rem;
}

.hero-txt{
  grid-area:txt;
  text-align:center;
  padding:.2rem .2rem 0;
}

.hero-txt h1{
  margin:0 0 .7rem;
  font-family:var(--sans);
  font-size:clamp(2rem,8.4vw,3.5rem);
  font-weight:700;
  line-height:1.12;
  letter-spacing:.005em;
  text-wrap:balance;
}

.hero-txt h1::after{
  content:"";
  display:block;
  width:56px;
  height:8px;
  margin:.85rem auto 0;
  background:var(--ink);
  transform:skewX(-22deg);
}

.lede{
  margin:0 auto;
  max-width:44ch;
  font-size:1rem;
  line-height:1.8;
  color:var(--mute);
}

.hero-fig{
  grid-area:fig;
  margin:0;
  border:3px solid var(--ink);
  border-radius:var(--radius);
  overflow:hidden;
  aspect-ratio:4/3;
  background:var(--paper);
}

.hero-img{
  width:100%;
  height:100%;
  object-fit:cover;
}

.hero-fig--ink{
  background:
    repeating-linear-gradient(-45deg,var(--ink) 0 9px,var(--paper) 9px 22px);
}

.slash{
  height:24px;
  background:var(--ink);
  transform:skewY(-1.3deg);
  margin:.4rem -10px 0;
}

/* ---- grid / content ---- */
.grid{
  display:grid;
  gap:2rem;
  padding:2.2rem 0 3rem;
  align-items:start;
}

.col{min-width:0}

.body{
  max-width:76ch;
  font-size:1rem;
  line-height:1.85;
}

.body div{
  margin:0 0 2.4rem;
  padding-bottom:1.4rem;
  border-bottom:1px dashed var(--hair);
  scroll-margin-top:1rem;
}

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

.body h2,
.body h3{
  font-family:var(--sans);
  font-weight:700;
  line-height:1.28;
  letter-spacing:.004em;
}

.body h2{
  margin:2.2rem 0 .8rem;
  padding-top:.55rem;
  font-size:clamp(1.45rem,4.6vw,2.05rem);
  border-top:3px solid var(--ink);
}

.body h3{
  margin:1.8rem 0 .5rem;
  font-size:clamp(1.15rem,3.6vw,1.4rem);
}

.body h2 > span,
.body h3 > span,
.side-h > span,
.dock-form-h > span{
  display:inline-block;
  padding-bottom:.06em;
  box-shadow:inset 0 -.3em 0 rgba(0,0,0,.13);
}

.body p{margin:0 0 1rem}

.body div > p:first-of-type::first-letter{
  float:left;
  font-family:var(--sans);
  font-weight:700;
  font-size:3.1em;
  line-height:.84;
  padding:.08em .12em 0 0;
}

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

.body a:hover{text-decoration-thickness:4px}

.body ul,
.body ol{
  margin:0 0 1.1rem;
  padding-left:1.35rem;
}

.body li{margin:.25rem 0}

.body strong{font-weight:700}

.body blockquote{
  margin:1.8rem 0;
  padding:.5rem 0 .5rem 1.1rem;
  border-left:8px solid var(--ink);
  font-family:var(--sans);
  font-size:1.15rem;
  line-height:1.55;
  font-weight:500;
}

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

.body blockquote p:first-of-type::first-letter{float:none;font-size:inherit;padding:0}

.body figure{
  margin:1.6rem 0;
  border:3px solid var(--ink);
  border-radius:var(--radius);
  overflow:hidden;
}

.body figcaption{
  padding:.6rem .9rem;
  border-top:3px solid var(--ink);
  font-family:var(--sans);
  font-size:.92rem;
  color:var(--mute);
}

.body table{
  width:100%;
  margin:1.2rem 0;
  border-collapse:collapse;
  font-size:.96rem;
}

.body th,
.body td{
  padding:.6rem .7rem;
  border:2px solid var(--ink);
  text-align:left;
  vertical-align:top;
}

.body th{font-family:var(--sans);background:rgba(0,0,0,.05)}

.body hr{
  height:3px;
  margin:1.8rem 0;
  border:0;
  background:var(--ink);
}

.body code{
  font-size:.95em;
  padding:.1em .35em;
  border:1px solid var(--hair);
  border-radius:6px;
}

.body pre{
  overflow-x:auto;
  padding:.9rem;
  border:3px solid var(--ink);
  border-radius:18px;
}

@media (min-width:980px){
  .body div > p{columns:2;column-gap:2.4rem}
  .body div > p:first-of-type::first-letter{font-size:3.4em}
}

/* ---- aside ---- */
.side{
  border:3px solid var(--ink);
  border-radius:var(--radius);
  padding:1rem 1.1rem 1.1rem;
  background:var(--paper);
}

.side-h{
  margin:0 0 .6rem;
  font-family:var(--sans);
  font-size:1.02rem;
  font-weight:700;
  letter-spacing:.02em;
}

.side-list{
  list-style:none;
  margin:0 0 .7rem;
  padding:0;
}

.side-list a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:.5rem .15rem;
  border-bottom:1px dashed var(--hair);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.4;
  text-decoration:none;
  transition:padding-left .18s ease, background .18s ease;
}

.side-list li:last-child a{border-bottom:0}

.side-list a:hover{
  padding-left:.5rem;
  background:rgba(0,0,0,.05);
}

.to-top{
  display:block;
  padding:.6rem .2rem;
  font-family:var(--sans);
  font-size:16px;
  text-decoration:none;
  border-top:3px solid var(--ink);
  margin-top:.4rem;
}

.to-top::after{content:" ↑"}

@media (min-width:920px){
  .grid{grid-template-columns:minmax(0,1fr) 250px;gap:2.6rem}
  .side{position:sticky;top:1.2rem}
}

/* ---- bottom dock ---- */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:60;
  background:var(--paper);
  border-top:3px solid var(--ink);
  padding:.45rem 12px calc(.45rem + env(safe-area-inset-bottom));
}

.dock-row{
  display:flex;
  align-items:center;
  gap:.4rem;
  max-width:1180px;
  margin:0 auto;
}

.dock-brand{
  display:flex;
  align-items:center;
  gap:.4rem;
  min-height:44px;
  padding:.4rem .1rem;
  font-family:var(--sans);
  font-size:16px;
  font-weight:700;
  letter-spacing:.01em;
  text-decoration:none;
  white-space:nowrap;
}

.mark{
  width:26px;height:26px;
  border-radius:50%;
  border:2px solid var(--ink);
  object-fit:cover;
}

.dock-btn{
  margin-left:auto;
  min-height:44px;
  padding:.45rem .9rem;
  border:2px solid var(--ink);
  border-radius:999px;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  cursor:pointer;
}

.dock-btn:hover{background:var(--ink);color:var(--paper)}

.dock-nav{
  flex:1 1 auto;
  min-width:0;
  overflow-x:auto;
  scrollbar-width:none;
}

.dock-nav::-webkit-scrollbar{height:0}

.dock-nav dl{
  display:flex;
  align-items:center;
  gap:.1rem;
  margin:0;
  padding:0;
}

.dock-nav dt{display:none}

.dock-nav dd{margin:0}

.dock-nav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:.45rem .55rem;
  border-radius:999px;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.35;
  text-decoration:none;
  white-space:nowrap;
  transition:background .16s ease, color .16s ease;
}

.dock-nav a:hover,
.dock-nav a:focus-visible{
  background:var(--ink);
  color:var(--paper);
}

.dock-form{
  display:none;
  align-items:center;
  gap:.35rem;
  margin-left:auto;
}

.dock-form-h{
  margin:0;
  font-family:var(--sans);
  font-size:15px;
  font-weight:700;
  white-space:nowrap;
}

.dock-input{
  width:138px;
  min-height:44px;
  padding:.4rem .75rem;
  border:2px solid var(--ink);
  border-radius:999px;
  font-family:var(--sans);
  font-size:16px;
  color:var(--ink);
  background:var(--paper);
}

.dock-sub{
  min-height:44px;
  padding:.4rem .95rem;
  border:2px solid var(--ink);
  border-radius:999px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--sans);
  font-size:16px;
  cursor:pointer;
  transition:transform .14s ease;
}

.dock-sub:hover{transform:translateY(-2px)}

.dock-copy{
  margin:.3rem 0 0;
  text-align:center;
  font-family:var(--sans);
  font-size:14px;
  line-height:1.5;
  color:var(--mute);
}

@media (max-width:879px){
  .dock-nav{overflow-x:auto}

  .dock.is-open .dock-nav{
    position:absolute;
    left:0;right:0;bottom:100%;
    max-height:62vh;
    padding:.7rem 14px 1rem;
    border-top:3px solid var(--ink);
    background:var(--paper);
    overflow-x:hidden;
    overflow-y:auto;
  }

  .dock.is-open .dock-nav dl{
    display:grid;
    gap:.05rem;
    align-items:stretch;
  }

  .dock.is-open .dock-nav dt{
    display:block;
    padding:.7rem .15rem .2rem;
    font-family:var(--sans);
    font-size:14px;
    letter-spacing:.14em;
    color:var(--mute);
  }

  .dock.is-open .dock-nav a{
    min-height:48px;
    padding:.55rem .15rem;
    border-bottom:1px solid var(--hair);
    border-radius:0;
  }
}

@media (min-width:880px){
  :root{--dock:116px}
  body{font-size:18px}
  .dock-btn{display:none}
  .dock-form{display:flex}
  .dock-nav{overflow:visible}
}

/* ---- motion ---- */
@keyframes rise{
  from{opacity:0;transform:translateY(16px)}
  to{opacity:1;transform:none}
}

.rv{opacity:0;transform:translateY(14px)}

.rv.in{
  opacity:1;
  transform:none;
  transition:opacity .6s ease, transform .6s cubic-bezier(.2,.7,.3,1);
}

@media (prefers-reduced-motion:no-preference){
  .hero-txt > *{animation:rise .62s cubic-bezier(.2,.7,.3,1) both}
  .hero-txt > *:nth-child(2){animation-delay:.09s}
  .hero-fig{animation:rise .72s .04s both}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none}
  *{animation-duration:.001s !important;transition-duration:.001s !important}
}

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