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

:root{
  --ink:#1f1726;
  --ink-soft:#4a3f56;
  --plum:#56228b;
  --plum-deep:#3a1660;
  --clay:#8b4513;
  --paper:#f6f1e8;
  --paper-2:#efe6d9;
  --card:rgba(255,255,255,.64);
  --line:rgba(31,23,38,.16);
  --line-soft:rgba(31,23,38,.09);
  --r-md:18px;
  --r-lg:24px;
  --bar-h:112px;
  --serif:"Newsreader",Georgia,"Songti SC","Noto Serif SC",serif;
  --sans:"Roboto","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}
html.is-locked,html.is-locked body{overflow:hidden}

body{
  margin:0;
  font-family:var(--sans);
  font-size:1.0625rem;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(rgba(139,69,19,.09) 1px,transparent 1px);
  background-size:16px 16px;
  overflow-x:clip;
}

[id]{scroll-margin-top:calc(var(--bar-h) + 18px)}

a{color:var(--plum)}
a:focus-visible,button:focus-visible{outline:2px solid var(--plum);outline-offset:3px;border-radius:8px}

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

/* 顶栏 */
.bar{
  position:sticky;
  top:0;
  z-index:30;
  background:rgba(246,241,232,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}

.bar__top{
  position:relative;
  z-index:50;
  display:flex;
  align-items:center;
  padding:10px clamp(14px,4vw,32px) 0;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:46px;
  text-decoration:none;
  color:var(--ink);
  font-family:var(--serif);
  font-size:1.4rem;
  letter-spacing:.01em;
}

.brand__mark{
  display:grid;
  place-items:center;
  width:34px;
  height:34px;
  flex:0 0 auto;
  border-radius:60% 40% 55% 45% / 50% 58% 42% 50%;
  background:var(--plum);
  color:#fff;
  font-family:var(--sans);
  font-size:1rem;
  line-height:1;
}
.brand__mark--sm{width:28px;height:28px;font-size:.85rem}
.brand__pic{width:34px;height:34px;object-fit:cover;border-radius:60% 40% 55% 45% / 50% 58% 42% 50%}

.bar__mid{
  position:relative;
  z-index:50;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:6px clamp(14px,4vw,32px) 10px;
}

.burger{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(255,255,255,.5);
  color:var(--ink);
  font:inherit;
  font-size:1rem;
  cursor:pointer;
  transition:background .2s ease,border-color .2s ease;
}
.burger:hover{background:#fff;border-color:var(--plum)}
.burger__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:18px;height:14px}
.burger__bars i{display:block;height:2px;border-radius:2px;background:var(--ink);transition:transform .25s ease,opacity .2s ease}
.bar.is-open .burger__bars i:first-child{transform:translateY(6px) rotate(45deg)}
.bar.is-open .burger__bars i:nth-child(2){opacity:0}
.bar.is-open .burger__bars i:last-child{transform:translateY(-6px) rotate(-45deg)}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 22px;
  border-radius:999px;
  background:var(--plum);
  color:#fff;
  text-decoration:none;
  font-size:1rem;
  transition:background .2s ease;
}
.cta:hover{background:var(--plum-deep)}

/* 全屏菜单 */
.bar__nav{
  position:fixed;
  inset:0;
  z-index:40;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:calc(var(--bar-h) + 24px) clamp(18px,5vw,48px) 40px;
  overflow-y:auto;
  background:radial-gradient(circle at 82% 8%,rgba(86,34,139,.6),transparent 62%),radial-gradient(circle at 12% 92%,rgba(139,69,19,.45),transparent 58%),#1f1726;
  opacity:0;
  visibility:hidden;
  transform:translateY(-12px);
  transition:opacity .3s ease,transform .3s ease,visibility .3s;
}
.bar.is-open .bar__nav{opacity:1;visibility:visible;transform:none}

.bar__list{
  list-style:none;
  margin:0;
  padding:0;
  width:min(560px,100%);
  display:flex;
  flex-direction:column;
  gap:2px;
}

.bar__link{
  display:flex;
  align-items:baseline;
  gap:14px;
  min-height:56px;
  padding:10px 6px;
  border-bottom:1px solid rgba(246,241,232,.16);
  color:#f4ecff;
  text-decoration:none;
  font-family:var(--serif);
  font-size:clamp(1.3rem,4.4vw,2rem);
  line-height:1.3;
  transition:padding-left .2s ease,color .2s ease;
}
.bar__link:hover{padding-left:14px;color:#fff}
.bar__num{font-family:var(--sans);font-size:.78rem;letter-spacing:.18em;color:#c9a7e8}

/* 首屏 */
.hero{
  position:relative;
  overflow:hidden;
  min-height:100svh;
  display:flex;
  align-items:flex-start;
  padding:clamp(28px,7vw,72px) clamp(18px,5vw,56px) 140px;
  background:
    radial-gradient(circle at 10% 6%,rgba(86,34,139,.18),transparent 56%),
    radial-gradient(circle at 90% 82%,rgba(139,69,19,.2),transparent 58%),
    linear-gradient(180deg,#faf6ef,#f0e7d9);
}

.hero__inner{position:relative;z-index:2;width:min(1120px,100%);margin:0 auto}

.hero__title{
  margin:0;
  max-width:15ch;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(2.5rem,10.5vw,6.4rem);
  line-height:1.04;
  letter-spacing:-.015em;
  color:var(--ink);
}

.hero__badge{
  position:absolute;
  z-index:3;
  left:clamp(18px,5vw,56px);
  bottom:22%;
  display:inline-flex;
  align-items:center;
  min-height:46px;
  padding:0 20px;
  border:1px solid var(--plum);
  border-radius:999px;
  background:rgba(255,255,255,.72);
  color:var(--plum);
  text-decoration:none;
  font-size:1rem;
  -webkit-backdrop-filter:blur(4px);
  backdrop-filter:blur(4px);
  transition:background .2s ease,color .2s ease;
}
.hero__badge:hover{background:var(--plum);color:#fff}

.hero__blob{
  position:absolute;
  z-index:0;
  pointer-events:none;
  border-radius:58% 42% 46% 54% / 52% 46% 54% 48%;
  will-change:transform;
}
.hero__blob--a{
  width:min(48vw,420px);
  aspect-ratio:1;
  right:-7vw;
  top:10vh;
  background:radial-gradient(circle at 32% 30%,rgba(86,34,139,.36),rgba(86,34,139,.04) 70%);
}
.hero__blob--b{
  width:min(38vw,320px);
  aspect-ratio:1;
  left:-9vw;
  bottom:6vh;
  border-radius:44% 56% 62% 38% / 48% 40% 60% 52%;
  background:radial-gradient(circle at 40% 62%,rgba(139,69,19,.34),rgba(139,69,19,.04) 72%);
}

.hero__vine{
  position:absolute;
  z-index:1;
  right:1%;
  top:0;
  height:100%;
  width:min(46vw,300px);
  color:var(--clay);
  opacity:.45;
  pointer-events:none;
}

/* 主体 */
.main{position:relative;z-index:1;margin-top:-56px}

.wrap{
  width:min(1140px,100%);
  margin:0 auto;
  padding:0 clamp(14px,5vw,40px);
}

.content{
  display:grid;
  grid-template-columns:minmax(0,1fr) 268px;
  gap:clamp(22px,4vw,44px);
  align-items:start;
}

.prose{min-width:0;max-width:72ch;overflow-wrap:anywhere}

.prose > div{
  position:relative;
  margin:0 0 26px;
  padding:clamp(20px,3vw,32px);
  border:1px solid var(--line);
  border-radius:var(--r-md) var(--r-lg) var(--r-md) 22px;
  background:var(--card);
}
.prose > div:nth-child(even){border-radius:var(--r-lg) var(--r-md) 22px var(--r-md)}
.prose > div:nth-child(3n){border-radius:20px 22px var(--r-lg) var(--r-md)}
.prose > div::before{
  content:"";
  position:absolute;
  left:0;
  top:24px;
  width:4px;
  height:26px;
  border-radius:0 4px 4px 0;
  background:var(--clay);
  opacity:.7;
}

.prose small,
.side small{
  display:block;
  margin-bottom:.45em;
  font-family:var(--sans);
  font-size:.78rem;
  letter-spacing:.2em;
  color:var(--clay);
}

.prose h2{
  margin:.1em 0 .55em;
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(1.45rem,3.4vw,2rem);
  line-height:1.28;
  letter-spacing:-.01em;
}

.prose h3{
  margin:1.2em 0 .4em;
  font-family:var(--serif);
  font-weight:600;
  font-size:1.2rem;
  line-height:1.4;
}

.prose p{margin:0 0 1.05em}
.prose > div > *:last-child{margin-bottom:0}

.prose ul,.prose ol{margin:0 0 1.05em;padding-left:1.35em}
.prose li{margin:.32em 0}

.prose a{color:var(--plum);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose a:hover{color:var(--plum-deep)}

.prose blockquote{
  margin:0 0 1.05em;
  padding:.2em 0 .2em 1em;
  border-left:3px solid var(--clay);
  color:var(--ink-soft);
}

.prose img{
  border:1px solid var(--line);
  border-radius:var(--r-md);
}

.prose table{width:100%;border-collapse:collapse;font-size:1rem;margin:0 0 1.05em}
.prose th,.prose td{border:1px solid var(--line);padding:8px 10px;text-align:left}

/* 右侧栏 */
.side{
  position:sticky;
  top:calc(var(--bar-h) + 20px);
  padding:20px;
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:var(--paper-2);
}

.side__title{
  margin:0 0 .7em;
  font-family:var(--serif);
  font-weight:600;
  font-size:1.2rem;
  line-height:1.35;
}

.side__nav ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}

.side__nav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:6px 10px;
  border-bottom:1px solid var(--line-soft);
  border-radius:12px;
  color:var(--ink);
  text-decoration:none;
  font-size:1rem;
}
.side__nav li:last-child a{border-bottom:0}
.side__nav a:hover{background:rgba(86,34,139,.1);color:var(--plum)}

/* 页脚 */
.foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:14px;
  margin-top:clamp(36px,7vw,72px);
  padding:22px clamp(14px,5vw,40px) 30px;
  border-top:1px solid var(--line);
  background:var(--paper-2);
}

.foot__brand a{
  display:inline-flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  color:var(--ink);
  text-decoration:none;
  font-family:var(--serif);
  font-size:1.15rem;
}

.foot__nav{flex:1 1 auto}
.foot__nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:2px 4px;
  margin:0;
  padding:0;
}
.foot__nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 11px;
  border-radius:999px;
  color:var(--ink-soft);
  text-decoration:none;
  font-size:1rem;
}
.foot__nav a:hover{background:rgba(86,34,139,.1);color:var(--plum)}

.foot__copy{font-size:1rem;color:var(--ink-soft);text-align:center}

@media (max-width:900px){
  :root{--bar-h:104px}
  .content{grid-template-columns:minmax(0,1fr)}
  .side{position:static}
  .main{margin-top:-40px}
  .hero{min-height:94svh;padding-bottom:150px}
  .hero__vine{width:40vw;opacity:.34}
  .foot{flex-direction:column;align-items:stretch}
  .foot__brand a{justify-content:center}
  .foot__copy{order:3}
}

@media (max-width:520px){
  .bar__top{padding:8px 12px 0}
  .bar__mid{padding:4px 12px 8px}
  .bar__list{width:100%}
  .hero{padding-left:14px;padding-right:14px}
  .hero__title{font-size:clamp(2.3rem,11.5vw,3.4rem)}
  .hero__badge{left:14px;bottom:16%}
  .wrap{padding-left:12px;padding-right:12px}
  .prose > div{padding:18px 16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:.01ms !important;animation-duration:.01ms !important}
  .hero__blob{transform:none !important}
}

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