@import url('https://fonts.googleapis.com/css2?family=Press+Start+2P&family=VT323&display=swap');

:root{
  --plum:#56228b;
  --ochre:#8b4513;
  --ink:#1f1726;
  --ink-soft:#2b2137;
  --paper:#efe7f4;
  --dim:#c2b0d1;
  --lilac:#c79cf5;
  --line:rgba(239,231,244,.14);
  --glass:rgba(239,231,244,.055);
  --r-lg:22px;
  --r-md:15px;
  --r-sm:10px;
  --head:'VT323','Press Start 2P',ui-monospace,SFMono-Regular,Menlo,monospace;
}

*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:17px;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-text-size-adjust:100%;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-2;
  pointer-events:none;
  background:
    radial-gradient(58% 42% at 88% 6%,rgba(86,34,139,.60),transparent 70%),
    radial-gradient(52% 46% at 6% 42%,rgba(139,69,19,.42),transparent 72%),
    radial-gradient(72% 52% at 50% 104%,rgba(86,34,139,.34),transparent 70%);
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.55;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='320' height='320'%3E%3Cpath d='M160 44c44 0 76 36 73 79-3 47-39 63-74 70-41 8-78-17-82-60-4-45 41-89 83-89z' fill='none' stroke='%23ffffff' stroke-opacity='.06' stroke-width='2'/%3E%3Cpath d='M96 214c30-16 62-10 82 12 18 20 12 46-14 56-28 11-62-2-74-24-9-17-2-36 6-44z' fill='none' stroke='%23ffffff' stroke-opacity='.05' stroke-width='2'/%3E%3C/svg%3E");
  background-size:460px 460px;
}

a{color:var(--lilac)}

img{max-width:100%}

/* ---------- 顶部两行 ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:30;
  padding:8px clamp(14px,4vw,40px) 0;
  background:rgba(31,23,38,.84);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}

.brandrow{display:flex;align-items:center;padding:2px 0 6px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  color:#fff;
  text-decoration:none;
  font-family:var(--head);
  font-size:1.7rem;
  letter-spacing:.06em;
  line-height:1.2;
}

.brandmark{
  width:34px;
  height:34px;
  border-radius:12px;
  object-fit:cover;
  border:1px solid var(--line);
}

.menubar{
  display:flex;
  align-items:center;
  gap:10px;
  padding:4px 0 9px;
  border-top:1px dashed var(--line);
}

.topbar nav{flex:1 1 auto;min-width:0}

.topbar nav p{
  display:flex;
  flex-wrap:wrap;
  gap:2px;
  margin:0;
}

.topbar nav a{
  display:inline-block;
  padding:10px 11px;
  min-height:44px;
  line-height:24px;
  font-size:16px;
  color:var(--dim);
  text-decoration:none;
  border-radius:999px;
  white-space:nowrap;
  transition:background .2s ease,color .2s ease;
}

.topbar nav a:hover,
.topbar nav a:focus-visible{
  color:#fff;
  background:rgba(86,34,139,.5);
}

.cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 18px;
  border-radius:999px;
  font-size:16px;
  font-weight:700;
  color:#fff;
  text-decoration:none;
  background:linear-gradient(135deg,var(--plum),var(--ochre));
  box-shadow:0 10px 24px -12px rgba(86,34,139,.9);
}

/* ---------- 首屏 ---------- */
.hero{
  position:relative;
  display:flex;
  align-items:flex-end;
  justify-content:flex-end;
  min-height:70vh;
  min-height:max(380px,68vh);
  overflow:hidden;
  border-radius:0 0 50% 50% / 0 0 78px 78px;
  background:linear-gradient(158deg,rgba(86,34,139,.62),rgba(31,23,38,.96));
}

.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.5;
  transform:scale(1.06);
  will-change:transform;
}

.hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  background:linear-gradient(178deg,rgba(31,23,38,.24),rgba(31,23,38,.9));
}

.hero-in{
  position:relative;
  z-index:2;
  max-width:min(780px,94%);
  padding:clamp(30px,7vw,70px) clamp(18px,5vw,58px);
  text-align:right;
}

.hero h1{
  margin:0 0 14px;
  font-family:var(--head);
  font-size:clamp(2rem,6vw,3.4rem);
  line-height:1.22;
  letter-spacing:.02em;
  color:#fff;
  text-shadow:0 8px 28px rgba(0,0,0,.6);
}

.hero-lead{
  margin:0;
  font-size:1.05rem;
  color:var(--dim);
  text-shadow:0 2px 12px rgba(0,0,0,.6);
}

/* ---------- 主体：左侧目录 + 右侧正文 ---------- */
.wrap{
  display:grid;
  grid-template-columns:258px minmax(0,1fr);
  gap:clamp(18px,3vw,34px);
  align-items:start;
  max-width:1180px;
  margin:0 auto;
  padding:clamp(26px,5vw,56px) clamp(14px,4vw,40px);
}

.rail{
  position:sticky;
  top:146px;
  padding:20px 16px;
  border:1px solid var(--line);
  border-radius:var(--r-lg) var(--r-md) var(--r-lg) var(--r-md);
  background:var(--glass);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  box-shadow:0 24px 50px -34px rgba(0,0,0,.95);
}

.rail h2{
  margin:0;
  font-family:var(--head);
  font-size:1.35rem;
  letter-spacing:.08em;
  color:#fff;
}

.rail .subtitle{
  margin:2px 0 14px;
  font-size:1rem;
  line-height:1.6;
  color:var(--dim);
}

.raillist{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}

.raillist a{
  display:block;
  min-height:40px;
  padding:8px 10px;
  border-left:2px solid transparent;
  border-radius:var(--r-sm);
  font-size:16px;
  color:var(--dim);
  text-decoration:none;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}

.raillist a:hover,
.raillist a:focus-visible{
  color:#fff;
  background:rgba(86,34,139,.42);
  border-left-color:var(--ochre);
}

div{min-width:0}

div > article{
  margin:0 0 20px;
  padding:clamp(20px,3.4vw,34px);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--glass);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
  box-shadow:0 26px 54px -40px rgba(0,0,0,.95);
  scroll-margin-top:152px;
}

div > article:nth-child(even){
  border-radius:var(--r-md) var(--r-sm) var(--r-lg) var(--r-sm);
}

div h2{
  margin:0 0 12px;
  font-family:var(--head);
  font-size:clamp(1.5rem,3.6vw,2rem);
  line-height:1.34;
  letter-spacing:.02em;
  color:#fff;
}

div h3{
  margin:1.4em 0 .5em;
  font-family:var(--head);
  font-size:1.3rem;
  line-height:1.4;
  color:#ecdcfa;
}

div p{margin:0 0 1em}
div p:last-child{margin-bottom:0}

div a{color:var(--lilac)}

div img{
  display:block;
  height:auto;
  margin:1.1em 0;
  border-radius:var(--r-md);
  border:1px solid var(--line);
}

div ul,
div ol{padding-left:1.3em;margin:0 0 1em}

div li{margin:.32em 0}

div blockquote{
  margin:1.1em 0;
  padding:12px 18px;
  border-left:3px solid var(--ochre);
  border-radius:0 var(--r-md) var(--r-md) 0;
  background:rgba(139,69,19,.2);
}

div blockquote p:last-child{margin:0}

/* ---------- 页脚 ---------- */
.foot{
  padding:clamp(30px,6vw,58px) clamp(14px,4vw,40px) 36px;
  border-top:1px solid var(--line);
  text-align:center;
  background:linear-gradient(180deg,transparent,rgba(139,69,19,.22));
}

.foot-cta{margin:0 0 26px}

.foot-cta a{
  display:inline-flex;
  align-items:center;
  min-height:52px;
  padding:0 30px;
  border-radius:999px;
  font-size:1.05rem;
  font-weight:700;
  color:#fff;
  text-decoration:none;
  background:linear-gradient(135deg,var(--ochre),var(--plum));
  box-shadow:0 16px 36px -14px rgba(139,69,19,.95);
}

.foot-copy{margin:0 0 8px;font-size:1rem;color:var(--dim)}

.foot small{display:block;font-size:1rem;line-height:1.6;color:rgba(194,176,209,.62)}

/* ---------- 动效 ---------- */
.rv{opacity:0;transform:translateY(18px);transition:opacity .62s ease,transform .62s ease}
.rv.in{opacity:1;transform:none}

/* ---------- 窄屏 ---------- */
@media (max-width:880px){
  .wrap{grid-template-columns:minmax(0,1fr);padding-top:24px}
  .rail{position:static;top:auto}
  .hero{min-height:max(340px,62vh);border-radius:0 0 46% 46% / 0 0 54px 54px}
  .hero-in{max-width:100%;padding:clamp(26px,7vw,44px) 18px}
  .topbar nav{overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
  .topbar nav p{flex-wrap:nowrap}
  .menubar{gap:8px}
  .cta{padding:0 14px}
  div > article{scroll-margin-top:140px}
}

@media (max-width:420px){
  body{font-size:16px}
  .brand{font-size:1.5rem}
  div > article{padding:18px 15px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .hero-img{transform:none}
}

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