@import url('https://fonts.googleapis.com/css2?family=Cormorant+Infant:wght@300;400;500;600;700&family=Great+Vibes&display=swap');

:root{
  --mint:#b4fde1;
  --sky:#add8e6;
  --ink:#172620;
  --paper:#f5fffb;
  --line:rgba(23,38,32,.3);
  --r-lg:24px;
  --r-md:18px;
  --r-sm:12px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  overflow-x:clip;
  font-family:"Cormorant Infant","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background:
    radial-gradient(120% 70% at 6% -5%, #ddfff3 0%, rgba(221,255,243,0) 58%),
    radial-gradient(90% 60% at 102% 4%, #cfeaf7 0%, rgba(207,234,247,0) 62%),
    linear-gradient(165deg, var(--mint) 0%, #c6f2ea 48%, var(--sky) 100%);
  background-attachment:fixed;
}
img{max-width:100%;height:auto;display:block}
h1,h2,h3{font-family:"Cormorant Infant","Songti SC","STSong",serif;font-weight:600;letter-spacing:.01em}
a{color:var(--ink)}
small{display:block;font-size:.78rem;letter-spacing:.22em;color:#2f6a56}

/* ---------- 顶栏 ---------- */
.top{
  position:sticky;
  top:0;
  z-index:50;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:.5rem;
  padding:.55rem clamp(.7rem,3vw,1.6rem);
  background:linear-gradient(180deg, rgba(248,255,252,.97), rgba(248,255,252,.87));
  border-bottom:4px solid var(--ink);
  box-shadow:0 8px 18px rgba(23,38,32,.14);
}
.cluster{display:flex;align-items:center;gap:.45rem;min-width:0}
.cluster-l{grid-column:1;justify-self:start}
.cluster-r{grid-column:3;justify-self:end}
.brand{
  grid-column:2;
  justify-self:center;
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  min-height:44px;
  padding:.35rem .9rem;
  text-decoration:none;
  color:var(--ink);
  font-family:"Great Vibes","Cormorant Infant",cursive;
  font-size:clamp(1.4rem,2.6vw,2rem);
  line-height:1;
  border:3px solid var(--ink);
  border-radius:999px;
  background:linear-gradient(150deg,#e8fff7,#cdf1fb);
  box-shadow:inset -2px -2px 7px rgba(23,38,32,.15), 4px 5px 0 rgba(23,38,32,.28);
  transition:transform .2s ease-out;
}
.brand:hover{transform:translateY(-2px)}
.brand .logo{width:34px;height:34px;border-radius:50%;border:3px solid var(--ink);object-fit:cover}
.drawer{position:relative}
.drawer>summary{
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  gap:.4rem;
  min-height:42px;
  padding:.35rem .8rem;
  font-size:.95rem;
  font-weight:600;
  border:3px solid var(--ink);
  border-radius:999px;
  background:var(--paper);
  box-shadow:inset -2px -2px 6px rgba(23,38,32,.12), 3px 4px 0 rgba(23,38,32,.22);
  transition:transform .2s ease-out, box-shadow .2s ease-out, background .2s ease-out;
}
.drawer>summary::-webkit-details-marker{display:none}
.drawer>summary::after{
  content:"";
  width:.42rem;
  height:.42rem;
  border-right:2.5px solid var(--ink);
  border-bottom:2.5px solid var(--ink);
  transform:rotate(45deg) translate(-1px,-1px);
}
.drawer[open]>summary{background:#dcfff2;box-shadow:inset 2px 2px 7px rgba(23,38,32,.2)}
.navlist{display:none;margin:0;padding:0;list-style:none}
.drawer[open]>.navlist{display:flex;align-items:center;gap:.1rem;flex-wrap:wrap}
.navlist a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:.3rem .7rem;
  text-decoration:none;
  font-size:.97rem;
  border:2px solid transparent;
  border-radius:var(--r-sm);
  transition:background .18s ease-out, border-color .18s ease-out, transform .18s ease-out;
}
.navlist a:hover{background:#e3fff5;border-color:var(--ink);transform:translateY(-1px)}
.navlist a:active{transform:translateY(1px)}
.pill{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:.35rem .9rem;
  text-decoration:none;
  font-size:.92rem;
  font-weight:700;
  border:3px solid var(--ink);
  border-radius:999px;
  background:linear-gradient(150deg,#b8f0ff,#d5ffe9);
  box-shadow:inset -2px -2px 6px rgba(23,38,32,.14), 3px 4px 0 rgba(23,38,32,.24);
  transition:transform .2s ease-out;
}
.pill:hover{transform:translateY(-2px)}
.pill:active{transform:translateY(2px)}

/* ---------- 首屏 ---------- */
.lead{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.02fr);
  align-items:center;
  gap:clamp(1rem,4vw,2.6rem);
  min-height:45vh;
  padding:clamp(1.3rem,4vw,2.4rem) clamp(1rem,4vw,3rem) clamp(2.4rem,6vw,3.6rem);
}
.lead::before{
  content:"";
  position:absolute;
  left:-8%;
  right:-8%;
  bottom:-3.6rem;
  height:7.5rem;
  z-index:0;
  background:linear-gradient(90deg,var(--sky),var(--mint));
  border-top:4px solid var(--ink);
  transform:rotate(-2.5deg);
}
.lead>*{position:relative;z-index:1}
.collage{
  position:relative;
  margin:0;
  min-height:clamp(170px,34vw,270px);
  animation:soft 7s ease-in-out infinite;
}
@keyframes soft{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-7px)}
}
.collage .shot{
  position:absolute;
  display:block;
  border:4px solid var(--ink);
  border-radius:var(--r-lg);
  object-fit:cover;
  background:linear-gradient(150deg,#d9fff2,#b9e7f5);
  box-shadow:inset -3px -3px 12px rgba(23,38,32,.16), 7px 9px 0 rgba(23,38,32,.24);
}
.collage .shot:nth-child(1){width:58%;height:76%;left:0;top:2%;transform:rotate(-4deg)}
.collage .shot:nth-child(2){width:50%;height:62%;right:1%;bottom:0;transform:rotate(4deg)}
.lead-copy{text-align:right}
h1{margin:0 0 .6rem;font-size:clamp(1.8rem,5.6vw,3.4rem);line-height:1.12}
.lede{margin:0 0 1.1rem auto;max-width:34ch;font-size:1rem;color:#254236}
.cta{
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:.55rem 1.4rem;
  text-decoration:none;
  font-weight:700;
  border:4px solid var(--ink);
  border-radius:999px;
  background:linear-gradient(150deg,#c9ffe9,#a9dff2);
  box-shadow:inset -3px -3px 8px rgba(23,38,32,.15), 5px 6px 0 rgba(23,38,32,.28);
  transition:transform .2s ease-out, box-shadow .2s ease-out;
}
.cta:hover{transform:translateY(-2px)}
.cta:active{transform:translateY(3px);box-shadow:inset 3px 3px 9px rgba(23,38,32,.22)}

/* ---------- 正文区 ---------- */
.row{
  display:grid;
  grid-template-columns:minmax(0,232px) minmax(0,1fr);
  gap:clamp(1rem,3vw,2.2rem);
  align-items:start;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(1.6rem,4vw,2.8rem) clamp(1rem,4vw,3rem) 3rem;
}
.rail{
  position:sticky;
  top:6.4rem;
  padding:.9rem .8rem;
  border:4px solid var(--ink);
  border-radius:var(--r-md);
  background:var(--paper);
  box-shadow:inset -3px -3px 10px rgba(23,38,32,.12), 6px 7px 0 rgba(23,38,32,.2);
}
.rail-h{margin:.1rem 0 .6rem;font-size:1.3rem;line-height:1.2}
.toc{list-style:none;counter-reset:step;margin:0;padding:0;display:grid;gap:.15rem}
.toc li{counter-increment:step}
.toc a{
  display:flex;
  align-items:center;
  gap:.5rem;
  min-height:40px;
  padding:.2rem .3rem;
  text-decoration:none;
  font-size:.94rem;
  border:2px solid transparent;
  border-radius:4px;
  transition:background .18s ease-out, border-color .18s ease-out;
}
.toc a::before{
  content:counter(step, cjk-ideographic);
  flex:none;
  width:1.55rem;
  height:1.55rem;
  display:grid;
  place-items:center;
  font-size:.78rem;
  border:2px solid var(--ink);
  border-radius:50%;
  background:#d9fff0;
}
.toc a:hover{background:#e6fff6;border-color:var(--ink)}
.article{
  min-width:0;
  padding:clamp(1rem,3vw,2rem);
  border:4px solid var(--ink);
  border-radius:var(--r-lg);
  background:rgba(255,255,255,.74);
  box-shadow:inset -4px -4px 14px rgba(23,38,32,.1), 8px 10px 0 rgba(23,38,32,.18);
}
.article div{
  padding:1.3rem 0 1.6rem;
  scroll-margin-top:8rem;
}
.article div::after{
  content:"";
  display:block;
  height:4px;
  margin-top:1.5rem;
  border-radius:4px;
  background:linear-gradient(90deg,var(--mint),var(--sky));
}
.article div:last-child{padding-bottom:.4rem}
.article div:last-child::after{display:none}
.article h2{font-size:clamp(1.35rem,3.2vw,1.9rem);line-height:1.25;margin:.1rem 0 .7rem}
.article h3{font-size:1.15rem;margin:1.1rem 0 .5rem}
.article p{margin:0 0 .9rem}
.article ul,.article ol{padding-left:1.3rem;margin:0 0 1rem}
.article li{margin:.2rem 0}
.article a{color:#0f5d47;text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
.article a:hover{background:#dffff3}
.article img{margin:1rem 0;border:3px solid var(--ink);border-radius:var(--r-md)}
.article figure{margin:1rem 0}
.article figcaption{font-size:.85rem;color:#31513f}
.article aside{
  margin:1rem 0;
  padding:.9rem 1rem;
  border:3px solid var(--ink);
  border-radius:var(--r-md);
  background:linear-gradient(150deg,#e9fff8,#ddf2fb);
  box-shadow:inset -2px -2px 8px rgba(23,38,32,.1);
}
.article blockquote{
  margin:1rem 0;
  padding:.6rem 1rem;
  border-left:6px solid var(--ink);
  background:#f0fffa;
  border-radius:0 var(--r-sm) var(--r-sm) 0;
}

/* ---------- 页脚 ---------- */
.foot{
  margin-top:2rem;
  padding:clamp(1.6rem,4vw,2.6rem) clamp(1rem,4vw,3rem) 1.2rem;
  border-top:4px solid var(--ink);
  background:linear-gradient(180deg, rgba(255,255,255,.62), rgba(214,246,255,.78));
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1rem 1.4rem;
}
.foot-brand{
  grid-column:1/-1;
  margin:0;
  font-family:"Great Vibes","Cormorant Infant",cursive;
  font-size:clamp(2.6rem,11vw,6rem);
  line-height:.95;
  overflow-wrap:anywhere;
  color:var(--ink);
  text-shadow:3px 4px 0 rgba(255,255,255,.92);
}
.foot-note{margin:0;font-size:.9rem;color:#2c4a3d}
.foot-links{margin:0}
.foot-links a{
  display:block;
  min-height:40px;
  padding:.3rem 0;
  font-size:.94rem;
  text-decoration:none;
  border-bottom:2px dotted rgba(23,38,32,.32);
}
.foot-links a:hover{background:#e2fff6}
.foot-copy{
  grid-column:1/-1;
  margin-top:.4rem;
  padding-top:.8rem;
  border-top:3px solid rgba(23,38,32,.24);
  font-size:.82rem;
  letter-spacing:.06em;
  color:#33523f;
}

/* ---------- 动效 ---------- */
.js-ready .lead,
.js-ready .rail,
.js-ready .article,
.js-ready .article div{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s cubic-bezier(.34,1.56,.64,1), transform .55s cubic-bezier(.34,1.56,.64,1);
}
.js-ready .in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:899px){
  .top{grid-template-columns:1fr auto;row-gap:.45rem;padding-bottom:.55rem}
  .brand{grid-column:1/-1;grid-row:1;justify-self:center;font-size:1.7rem}
  .cluster-l{grid-column:1;grid-row:2;justify-self:start}
  .cluster-r{grid-column:2;grid-row:2;justify-self:end}
  .drawer[open]>.navlist{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 10px);
    flex-direction:column;
    align-items:stretch;
    gap:.2rem;
    padding:.6rem;
    background:var(--paper);
    border:4px solid var(--ink);
    border-radius:var(--r-md);
    box-shadow:6px 8px 0 rgba(23,38,32,.26);
    z-index:60;
  }
  .navlist a{min-height:44px;justify-content:flex-start}
  .lead{grid-template-columns:1fr;gap:1.1rem;padding-bottom:2.6rem;min-height:0}
  .collage{min-height:190px}
  h1{font-size:clamp(1.7rem,8vw,2.4rem)}
  .row{grid-template-columns:1fr;padding-top:1.4rem}
  .rail{position:static}
  .foot{grid-template-columns:1fr 1fr}
  .foot-note{grid-column:1/-1}
  .foot-brand{font-size:clamp(2.4rem,13vw,3.6rem)}
}

@media (max-width:520px){
  .foot{grid-template-columns:1fr}
  .foot-links a{padding:.4rem 0}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .collage{animation:none}
  .js-ready .lead,
  .js-ready .rail,
  .js-ready .article,
  .js-ready .article div{opacity:1;transform:none;transition:none}
}

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