*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#4f46e5;--accent-light:#eef2ff;--ink:#1e1b4b;--muted:#64748b;--line:#e2e8f0;--max:960px}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:var(--ink);line-height:1.82;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.container{width:min(100% - 2rem,var(--max));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:62px}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:600;color:var(--ink)}.brand b{color:var(--accent)}
.site-nav ul{display:flex;gap:1rem;list-style:none}.site-nav a{color:var(--muted);font-size:.93rem}
.site-nav a.active,.site-nav a:hover{color:var(--accent)}
.nav-toggle{display:none;border:1px solid var(--line);width:40px;height:40px;border-radius:8px;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px;background:#fff}
.nav-toggle span{width:20px;height:2px;background:var(--ink);display:block}
.ads-top-bar{border-bottom:1px solid var(--line);padding:.5rem 0;background:#fff}
.applist-title{font-size:.76rem;color:var(--muted);text-align:center;margin-bottom:.35rem}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:.4rem}
.hero-split{display:grid;grid-template-columns:1fr 280px;gap:2rem;align-items:center;padding:2.5rem 0 2rem;border-bottom:1px solid var(--line)}
.hero-split-text h1{font-size:clamp(1.4rem,3vw,1.9rem);line-height:1.35;margin-bottom:1rem;color:var(--ink)}
.hero-split-text .lead{color:#334155;margin-bottom:.75rem;font-size:1.02rem}
.hero-split-visual{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem 1.5rem;background:linear-gradient(145deg,var(--accent-light) 0%,#fff 100%);border:1px solid var(--line);border-radius:16px;text-align:center}
.hero-split-visual img{border-radius:12px;margin-bottom:1rem;box-shadow:0 8px 24px rgba(79,70,229,.15)}
.hero-split-visual .tagline{font-size:.88rem;color:var(--muted);line-height:1.5}
.link-strip{display:flex;flex-wrap:wrap;gap:.65rem;padding:1.25rem 0;border-bottom:1px solid var(--line)}
.link-strip a{padding:.4rem .9rem;border:1px solid var(--line);border-radius:999px;font-size:.85rem;color:var(--ink);background:#fafafa}
.link-strip a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none;background:var(--accent-light)}
.steps-list{list-style:none;padding:2rem 0}
.step{display:flex;gap:1.25rem;margin-bottom:2rem;padding-bottom:2rem;border-bottom:1px dashed var(--line)}
.step:last-child{border-bottom:none}
.step-num{flex-shrink:0;width:48px;height:48px;border-radius:50%;background:var(--accent);color:#fff;font-weight:700;font-size:1.2rem;display:flex;align-items:center;justify-content:center}
.step-body h2{font-size:1.12rem;margin-bottom:.75rem;color:var(--ink)}
.step-body p{margin-bottom:.85rem;text-align:justify;color:#334155}
.callout{margin:1rem 0;padding:.9rem 1.1rem;background:var(--accent-light);border-left:4px solid var(--accent);border-radius:0 10px 10px 0;font-size:.95rem}
.faq-section{padding:0 0 2rem;border-top:1px solid var(--line);margin-top:1rem;padding-top:2rem}
.faq-section h2{font-size:1.1rem;margin-bottom:1rem}
.faq-section details{border:1px solid var(--line);border-radius:10px;padding:.9rem;margin-bottom:.6rem;background:#fafafa}
.faq-section summary{cursor:pointer;font-weight:600}
.related-read{margin:2rem 0 3rem;padding:1.2rem;border:1px solid var(--line);border-radius:12px;background:#fafafa}
.related-grid{display:flex;flex-wrap:wrap;gap:.6rem}
.related-grid a{padding:.4rem .8rem;border:1px solid var(--line);border-radius:8px;font-size:.86rem;color:var(--ink);text-decoration:none;background:#fff}
.related-grid a:hover{border-color:var(--accent);color:var(--accent)}
.page-head{padding:2rem 0 1rem;border-bottom:1px solid var(--line)}
.breadcrumb{font-size:.84rem;color:var(--muted);margin-bottom:.4rem}
.prose-page{padding:2rem 0 3rem}.prose-page h2{color:var(--accent);margin:1.4rem 0 .8rem;font-size:1.1rem}
.prose-page p{margin-bottom:.9rem;text-align:justify;color:#334155}
.site-footer{border-top:1px solid var(--line);padding:1.6rem 0;text-align:center;color:var(--muted);font-size:.86rem}
.footer-links{display:flex;justify-content:center;gap:1rem;margin-bottom:.5rem;flex-wrap:wrap}
.error-page{min-height:50vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:2rem}
.error-page h1{font-size:3.5rem;color:var(--accent)}
@media(max-width:768px){
  .hero-split{grid-template-columns:1fr;gap:1.5rem}
  .hero-split-visual{order:-1;padding:1.5rem}
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:1rem;display:none;box-shadow:0 8px 24px rgba(0,0,0,.06)}
  .site-nav.is-open{display:block}.site-nav ul{flex-direction:column}
  .header-row{position:relative}
}