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

:root{
  --ink:#172623;
  --ink-2:#3b4d47;
  --sand:#d4c4a8;
  --sand-2:#e7dbc7;
  --line:#d9cab3;
  --jade:#5cc6b0;
  --jade-2:#2c8a76;
  --clay:#c67b5c;
  --bg:#f5eee2;
  --bg-2:#ebe1d0;
  --card:#fbf6ec;
}

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

html{
  font-size:17px;
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  font-family:'Plus Jakarta Sans','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  color:var(--ink);
  line-height:1.72;
  background:
    radial-gradient(1100px 480px at 84% -10%, #f0e2cd 0%, rgba(240,226,205,0) 64%),
    linear-gradient(180deg,var(--bg) 0%, var(--bg-2) 100%);
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    radial-gradient(rgba(23,38,35,.065) .5px, transparent .5px),
    radial-gradient(rgba(198,123,92,.055) .5px, transparent .5px);
  background-size:3px 3px, 7px 7px;
  background-position:0 0, 2px 3px;
  opacity:.85;
}

a{color:inherit;text-decoration:none}
img{max-width:100%}
p{margin:0}
:focus-visible{outline:2px solid var(--jade-2);outline-offset:2px}

/* 顶部条 */
.top{
  position:sticky;
  top:0;
  z-index:30;
  display:flex;
  align-items:center;
  gap:.55rem;
  padding:.5rem clamp(.9rem,3.4vw,2.2rem);
  background:rgba(245,238,226,.93);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.mark{
  flex:0 0 auto;
  width:42px;
  height:42px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--card);
  color:var(--jade-2);
  overflow:hidden;
}
.markimg{width:100%;height:100%;object-fit:cover;display:block}
.markglyph{
  font-size:.72rem;
  font-weight:700;
  line-height:1.1;
  padding:2px;
  text-align:center;
  word-break:break-all;
}

.mainnav{
  display:flex;
  align-items:center;
  gap:.15rem;
  margin-left:auto;
  min-width:0;
}

.navlink,.drop>summary{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:.4rem .62rem;
  border-radius:10px;
  font-size:.95rem;
  white-space:nowrap;
  cursor:pointer;
}
.navlink:hover,.drop>summary:hover{background:#e9dfcd}

.drop{position:relative}
.drop>summary{list-style:none;border:1px solid var(--line)}
.drop>summary::-webkit-details-marker{display:none}
.drop[open]>summary{background:#e9dfcd}

.dropmenu{
  position:absolute;
  right:0;
  top:calc(100% + .35rem);
  list-style:none;
  margin:0;
  padding:.35rem;
  min-width:12rem;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:10px;
  display:grid;
  gap:1px;
  box-shadow:0 14px 28px -22px rgba(23,38,35,.55);
}
.dropmenu a{
  display:block;
  padding:.6rem .65rem;
  border-radius:8px;
  font-size:.95rem;
  border-left:2px solid transparent;
}
.dropmenu a:hover{background:#f1e8d8;border-left-color:var(--jade)}

.call{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:.34rem;
  min-height:44px;
  padding:.4rem .76rem;
  border:1px solid var(--jade);
  border-radius:10px;
  color:var(--jade-2);
  font-size:.95rem;
  white-space:nowrap;
}
.call:hover{background:var(--jade);color:#0f201b}
.call-ico{font-size:.9rem}

/* 主体 */
.stage{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(0,1fr) 18.5rem;
  grid-template-areas:
    "hero collage"
    "prose side";
  gap:clamp(1.4rem,3.6vw,2.8rem);
  align-items:start;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(1.6rem,4.5vw,3.4rem) clamp(.9rem,3.4vw,2.2rem) 4rem;
}

main section[id]{scroll-margin-top:6.2rem}

.hero{
  grid-area:hero;
  align-self:center;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:.85rem;
  min-height:min(66vh,560px);
}

.h1{
  margin:0;
  font-size:clamp(1.9rem,4.4vw,3rem);
  line-height:1.16;
  letter-spacing:-.015em;
  font-weight:700;
}
.h1::after{
  content:"";
  display:block;
  width:62px;
  height:4px;
  margin-top:1rem;
  border-radius:2px;
  background:linear-gradient(90deg,var(--jade),var(--sand));
}

.lede{
  font-size:1rem;
  color:var(--ink-2);
  max-width:34ch;
}

.collage{
  grid-area:collage;
  position:relative;
  margin:0;
  min-height:min(66vh,560px);
}
.collage .shot{
  position:absolute;
  display:block;
  overflow:hidden;
  border-radius:10px;
  border:1px solid var(--line);
  background:linear-gradient(150deg,var(--sand-2),var(--sand));
  will-change:transform;
}
.shot-a{top:0;left:0;width:62%;aspect-ratio:3/4}
.shot-b{bottom:0;right:0;width:52%;aspect-ratio:4/5;border-color:var(--jade);background:linear-gradient(150deg,#dcebe3,#b9d8cb)}
.collage .pic{width:100%;height:100%;object-fit:cover;display:block}

/* 正文 */
.prose{
  grid-area:prose;
  min-width:0;
  font-size:1rem;
  color:var(--ink-2);
  line-height:1.78;
}
.prose > section{padding:2.3rem 0}
.prose > section:first-child{padding-top:.3rem}
.prose > section + section{border-top:1px dashed var(--line)}

.prose h2{
  margin:0 0 .7rem;
  font-size:clamp(1.35rem,2.6vw,1.72rem);
  line-height:1.32;
  color:var(--ink);
  letter-spacing:-.01em;
}
.prose h3{
  margin:1.4rem 0 .45rem;
  font-size:1.14rem;
  line-height:1.4;
  color:var(--ink);
}
.prose p{margin:0 0 .95rem}
.prose ul,.prose ol{
  margin:0 0 1rem;
  padding-left:1.25rem;
  display:grid;
  gap:.4rem;
}
.prose li{line-height:1.7}
.prose a{color:var(--jade-2);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--ink)}
.prose blockquote{
  margin:1.2rem 0;
  padding:.65rem 1rem;
  border-left:3px solid var(--jade);
  border-radius:0 10px 10px 0;
  background:#f1e8d8;
}
.prose img{border-radius:10px;display:block;height:auto;margin:0 0 1rem}
.prose table{
  display:block;
  overflow-x:auto;
  max-width:100%;
  border-collapse:collapse;
  font-size:.95rem;
}
.prose th,.prose td{border:1px solid var(--line);padding:.5rem .65rem;text-align:left}

/* 右侧索引 */
.side{
  grid-area:side;
  position:sticky;
  top:5.6rem;
  padding:1.05rem 1.1rem 1.15rem;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--card);
}
.side small{
  display:block;
  font-size:.95rem;
  letter-spacing:.12em;
  color:var(--jade-2);
  margin-bottom:.1rem;
}
.side h2{
  margin:0 0 .65rem;
  font-size:1.08rem;
  letter-spacing:.01em;
  color:var(--ink);
}
.toc{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
.toc a{
  display:block;
  padding:.5rem .55rem;
  border-radius:8px;
  border-left:2px solid transparent;
  font-size:.95rem;
  color:var(--ink-2);
}
.toc a:hover{background:#f1e8d8;border-left-color:var(--jade);color:var(--ink)}

.side .kw{
  margin:1rem 0 0;
  padding-top:.8rem;
  border-top:1px dashed var(--line);
  font-size:.95rem;
  color:var(--ink-2);
  overflow-wrap:break-word;
}

/* 页脚 */
.foot{
  position:relative;
  z-index:1;
  display:flex;
  flex-wrap:wrap;
  align-items:flex-start;
  gap:1.8rem 1.6rem;
  padding:2.4rem clamp(.9rem,3.4vw,2.2rem) 2rem;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,#f0e7d8,#e6dbc9);
}
.fcol{min-width:0}
.fbrand{flex:1 1 13rem}
.bigmark{
  display:block;
  font-size:clamp(1.9rem,6.4vw,3.4rem);
  font-weight:700;
  line-height:1.02;
  letter-spacing:-.02em;
  color:var(--ink);
  overflow-wrap:break-word;
}
.footnav{flex:0 1 auto}
.footnav dl{margin:0}
.footnav dt{
  font-size:.95rem;
  letter-spacing:.14em;
  color:var(--jade-2);
  margin-bottom:.4rem;
}
.footnav dd{margin:0}
.footnav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.2rem 0;
  font-size:.95rem;
  color:var(--ink-2);
  border-bottom:1px solid transparent;
}
.footnav a:hover{color:var(--ink);border-bottom-color:var(--jade)}

.fcopy{
  flex:1 1 auto;
  margin-left:auto;
  display:flex;
  align-items:center;
  min-height:40px;
}
.cpy{font-size:.95rem;color:var(--ink-2)}

.fup{display:flex;align-items:center}
.fup a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.4rem .85rem;
  border:1px solid var(--line);
  border-radius:10px;
  font-size:.95rem;
  background:var(--card);
}
.fup a:hover{border-color:var(--jade);color:var(--jade-2)}

/* 动效 */
.reveal{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .62s ease-out, transform .62s ease-out;
}
.reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .collage .shot{transform:none !important}
}

@media (max-width:860px){
  .stage{
    grid-template-columns:minmax(0,1fr);
    grid-template-areas:
      "hero"
      "collage"
      "prose"
      "side";
  }
  .hero{min-height:0;padding-top:.6rem}
  .collage{min-height:0;aspect-ratio:5/4;margin-bottom:.4rem}
  .shot-a{width:60%}
  .shot-b{width:50%}
  .side{position:static;top:auto;order:4}
  .foot{gap:1.4rem 1.2rem}
  .fcopy{margin-left:0;flex:1 1 100%;order:3}
  .fup{order:2}
}

@media (max-width:640px){
  .fbrand{flex:1 1 100%}
  .footnav{flex:1 1 100%;order:1}
  .footnav dl{display:flex;flex-wrap:wrap;gap:.1rem 1.1rem;align-items:baseline}
  .footnav dt{width:100%;margin-bottom:.2rem}
  .footnav dd{margin:0}
}

@media (max-width:440px){
  .call .t{display:none}
  .call{padding:.4rem .6rem}
  .mainnav{gap:.05rem}
  .navlink,.drop>summary{padding:.4rem .5rem;font-size:.92rem}
}
</style>

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