*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#1e1b4b;--body:#334155;--muted:#64748b;--line:#e2e8f0;
  --violet:#6d28d9;--violet-soft:#ede9fe;--amber:#d97706;--amber-soft:#fffbeb;
  --header-h:58px;--wrap:800px;
}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,sans-serif;color:var(--body);background:#fff;line-height:1.82;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--violet);text-decoration:none}
a:hover{text-decoration:underline}

.site-header{position:sticky;top:0;z-index:300;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);box-shadow:0 1px 0 var(--violet-soft)}
.header-inner{max-width:1020px;margin:0 auto;padding:0 1.1rem;display:flex;align-items:center;justify-content:space-between;min-height:var(--header-h)}
.brand{display:flex;align-items:center;gap:.7rem;color:var(--ink);font-size:.88rem;text-decoration:none}
.brand:hover{text-decoration:none}
.brand em{font-style:normal;font-weight:700;color:var(--violet)}
.brand span{line-height:1.35;max-width:320px}

.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.5rem;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);transition:transform .2s,opacity .2s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.site-nav ul{display:flex;gap:1rem;list-style:none}
.site-nav a{color:var(--muted);font-size:.86rem;text-decoration:none;padding:.25rem 0;border-bottom:2px solid transparent}
.site-nav a:hover,.site-nav a.active{color:var(--violet);border-bottom-color:var(--violet);font-weight:600}

.ads-top-bar{background:var(--violet-soft);border-bottom:1px solid var(--line);padding:.55rem 0}
#applist{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.applist-title{font-size:.76rem;color:var(--muted);white-space:nowrap}
#ads{display:flex;gap:.75rem;flex-wrap:wrap}
.ads-item figure{margin:0;text-align:center}
.ads-item img{border-radius:10px}
.ads-item .caption{font-size:.66rem;color:var(--muted);margin-top:.2rem;max-width:68px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.shell{max-width:var(--wrap);margin:0 auto;padding:2.1rem 1.2rem 3.6rem}

.hero-strip{
  border-left:5px solid var(--violet);padding:1.65rem 1.5rem 1.45rem;
  background:linear-gradient(105deg,var(--violet-soft) 0%,#fff 42%,var(--amber-soft) 100%);
  border-radius:0 14px 14px 0;margin-bottom:2rem;
}
.hero-kicker{display:inline-block;font-size:.74rem;font-weight:700;letter-spacing:.04em;color:var(--violet);background:#fff;border:1px dashed var(--violet);padding:.2rem .7rem;border-radius:4px;margin-bottom:.75rem}
.hero-strip h1{font-size:1.55rem;line-height:1.36;font-weight:700;color:var(--ink);margin-bottom:.85rem}
.hero-strip .lead{font-size:.98rem;color:var(--body);margin-bottom:.65rem;text-align:justify}
.hero-chips{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:1rem}
.hero-chips span{font-size:.74rem;background:#fff;border:1px solid var(--line);color:var(--muted);padding:.2rem .55rem;border-radius:999px}

.accord-list{display:flex;flex-direction:column;gap:.55rem}
.accord-row{border:1px solid var(--line);border-radius:10px;background:#fff;overflow:hidden;transition:border-color .2s,box-shadow .2s}
.accord-row.is-open{border-color:#c4b5fd;box-shadow:0 8px 28px rgba(109,40,217,.08)}
.accord-head{
  width:100%;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:.85rem;
  padding:1rem 1.15rem;background:#fafafa;border:none;cursor:pointer;font:inherit;text-align:left;color:var(--ink);
}
.accord-head:hover{background:var(--violet-soft)}
.accord-idx{
  width:32px;height:32px;border-radius:6px;background:var(--violet);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:700;transform:rotate(-3deg);
}
.accord-row.is-open .accord-idx{background:var(--amber)}
.accord-title{font-weight:600;font-size:.96rem;line-height:1.4}
.accord-chevron{color:var(--violet);font-size:.85rem;transition:transform .25s;line-height:1}
.accord-row.is-open .accord-chevron{transform:rotate(180deg);color:var(--amber)}
.accord-body{display:none;padding:1.1rem 1.25rem 1.35rem;border-top:1px dashed var(--line);background:#fff}
.accord-row.is-open .accord-body{display:block}
.accord-body h2{font-size:1.04rem;color:var(--violet);margin-bottom:.7rem;font-weight:600}
.accord-body p{margin-bottom:.92rem;text-align:justify;color:#374151}
.accord-body ul{margin:.65rem 0 1rem 1.15rem;color:#374151}
.accord-body li{margin-bottom:.4rem}
.accord-body figure{margin:1.15rem 0;border-radius:12px;overflow:hidden;border:1px solid var(--line);box-shadow:0 2px 12px rgba(30,27,75,.06)}
.accord-body figcaption{font-size:.8rem;color:var(--muted);padding:.55rem .8rem;background:var(--amber-soft);text-align:center}
.tip-line{background:var(--violet-soft);border-left:4px solid var(--violet);padding:.8rem 1rem;border-radius:0 8px 8px 0;font-size:.91rem;margin:1rem 0;color:#4338ca}

.foot-links{display:flex;flex-wrap:wrap;gap:.65rem;margin-top:2rem;padding-top:1.45rem;border-top:1px dashed var(--line)}
.foot-links a{font-size:.84rem;color:var(--muted);background:#f8fafc;padding:.32rem .8rem;border-radius:6px;border:1px solid var(--line)}
.foot-links a:hover{color:var(--violet);text-decoration:none;border-color:#c4b5fd}

.prose-page{max-width:var(--wrap);margin:0 auto;padding:2rem 1.2rem 3rem}
.prose-page h1{font-size:1.45rem;margin-bottom:1rem;color:var(--violet)}
.prose-page p{margin-bottom:.95rem}

.error-page{max-width:var(--wrap);margin:4rem auto;padding:2rem 1.2rem;text-align:center}
.error-page h1{font-size:3rem;color:var(--violet);margin-bottom:.5rem}

.site-footer{background:#fafafa;border-top:1px solid var(--line);padding:1.55rem 1rem;text-align:center;font-size:.82rem;color:var(--muted)}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:.45rem 1rem;margin-bottom:.6rem}
.footer-links a{color:var(--muted)}
.footer-sub{font-size:.75rem;margin-top:.35rem;color:#94a3b8}

@media(max-width:640px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:.75rem 1rem;display:none;box-shadow:0 6px 18px rgba(0,0,0,.07)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:0}
  .site-nav li{border-bottom:1px solid var(--line)}
  .site-nav a{display:block;padding:.65rem 0;border-bottom:none}
  .hero-strip h1{font-size:1.28rem}
  .accord-head{padding:.85rem 1rem;gap:.65rem}
  .accord-idx{width:28px;height:28px;font-size:.72rem}
}