*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#1c1c1c;--muted:#555;--line:#e6e6e6;
  --accent:#e65100;--accent-soft:#fff3e0;--accent-dark:#bf360c;
  --teal:#00695c;--max:920px;
}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:var(--ink);line-height:1.78;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--max);margin:0 auto;padding:0 1.25rem}

.site-header{position:sticky;top:0;z-index:200;background:#fff;border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;justify-content:space-between;padding:.85rem 0;position:relative}
.brand{display:flex;align-items:center;gap:.65rem;color:var(--ink);font-size:.92rem;font-weight:500}
.brand:hover{text-decoration:none}
.brand img{border-radius:8px}
.brand b{color:var(--accent);font-weight:700}

.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:.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;flex-wrap:wrap;gap:.35rem 1.1rem;list-style:none}
.site-nav a{color:var(--muted);font-size:.88rem;padding:.2rem 0}
.site-nav a:hover,.site-nav a.active{color:var(--accent);font-weight:600;border-bottom:2px solid var(--accent)}

.ads-top-bar{background:#fafafa;border-bottom:1px solid var(--line);padding:.55rem 0}
.applist-title{font-size:.76rem;color:#888;margin-bottom:.35rem;letter-spacing:.04em}
#ads{display:flex;flex-wrap:wrap;gap:.75rem;align-items:flex-start}
.ads-item figure{margin:0;text-align:center}
.ads-item img{border-radius:8px}
.ads-item .caption{font-size:.68rem;color:var(--muted);margin-top:.25rem;max-width:68px;line-height:1.25}

.hero-ladder{padding:2rem 0 1.5rem;text-align:center}
.hero-tag{display:inline-block;font-size:.78rem;font-weight:600;color:var(--accent);background:var(--accent-soft);border:1px solid #ffcc80;padding:.2rem .75rem;border-radius:999px;margin-bottom:1rem}
.hero-ladder h1{font-size:1.62rem;line-height:1.38;margin-bottom:1rem;color:#111;max-width:820px;margin-left:auto;margin-right:auto}
.hero-ladder .lead{text-align:left;color:var(--muted);font-size:1.02rem;max-width:820px;margin:0 auto 1.25rem}

.progress-rail{display:flex;justify-content:center;gap:.35rem;flex-wrap:wrap;margin-bottom:2rem;padding:0 .5rem}
.progress-dot{width:2.4rem;height:2.4rem;border-radius:50%;border:2px solid #ddd;background:#fff;color:#999;font-size:.82rem;font-weight:700;display:flex;align-items:center;justify-content:center;transition:.2s}
.progress-dot.is-active{border-color:var(--accent);background:var(--accent);color:#fff;box-shadow:0 2px 8px rgba(230,81,0,.3)}
.progress-dot a{color:inherit;text-decoration:none;width:100%;height:100%;display:flex;align-items:center;justify-content:center;border-radius:50%}
.progress-dot a:hover{text-decoration:none}

.ladder-main{padding-bottom:3rem}
.ladder-step{position:relative;padding:2rem 0 2.25rem}
.ladder-step::after{
  content:"";display:block;width:0;height:0;margin:1.5rem auto 0;
  border-left:22px solid transparent;border-right:22px solid transparent;
  border-top:16px solid var(--accent-soft);
}
.ladder-step:last-child::after{display:none}

.step-head{display:flex;align-items:flex-start;gap:1rem;margin-bottom:1rem}
.step-num{
  flex-shrink:0;width:2.75rem;height:2.75rem;border-radius:12px;
  background:linear-gradient(145deg,var(--accent),var(--accent-dark));
  color:#fff;font-weight:800;font-size:1.05rem;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 3px 10px rgba(230,81,0,.25);
}
.ladder-step h2{font-size:1.22rem;line-height:1.4;padding-top:.35rem;color:#111}
.ladder-step p{margin-bottom:.85rem;text-align:justify;color:#333}
.ladder-step h3{font-size:1.02rem;margin:1.25rem 0 .5rem;color:var(--teal)}

.ladder-step figure{margin:1.25rem 0;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fafafa}
.ladder-step figcaption{font-size:.82rem;color:var(--muted);padding:.5rem .85rem .75rem;text-align:center}

.dual-cards{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin:1.1rem 0}
.mini-card{background:#fafafa;border:1px solid var(--line);border-radius:8px;padding:1rem 1.1rem;border-top:3px solid var(--accent)}
.mini-card h3{margin:0 0 .45rem;font-size:.95rem;color:var(--accent-dark)}
.mini-card ul{margin:.35rem 0 0 1.1rem;font-size:.92rem;color:#444}
.mini-card li{margin-bottom:.3rem}

.tip-box{background:var(--accent-soft);border-left:4px solid var(--accent);padding:.85rem 1rem;margin:1rem 0;font-size:.93rem;border-radius:0 8px 8px 0;color:#444}
.warn-box{background:#fce4ec;border-left:4px solid #c62828;padding:.85rem 1rem;margin:1rem 0;font-size:.93rem;border-radius:0 8px 8px 0;color:#444}

.closing-faq{margin-top:2.5rem;padding-top:2rem;border-top:2px solid var(--line)}
.closing-faq h2{font-size:1.2rem;margin-bottom:1rem}
.faq-row{padding:.85rem 0;border-bottom:1px solid #f0f0f0}
.faq-row:last-child{border-bottom:none}
.faq-row dt{font-weight:600;margin-bottom:.35rem;color:#222}
.faq-row dd{color:var(--muted);font-size:.95rem}

.site-footer{background:#fafafa;border-top:1px solid var(--line);padding:1.75rem 0;text-align:center;font-size:.86rem;color:var(--muted)}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:.5rem 1rem;margin-bottom:.65rem}
.footer-links a{color:#555}

.prose-page{padding:2rem 0 3rem}
.prose-page h1{font-size:1.45rem;margin-bottom:1rem}
.prose-page h2{font-size:1.1rem;margin:1.5rem 0 .65rem}
.prose-page p{margin-bottom:.75rem;color:#333}
.error-page{text-align:center;padding:3rem 1rem}
.error-page h1{font-size:3rem;color:var(--accent)}

@media(max-width:768px){
  .nav-toggle{display:flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;background:#fff;
    border-bottom:1px solid var(--line);padding:.75rem 1.25rem;display:none;
    box-shadow:0 4px 14px rgba(0,0,0,.06);
  }
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:0}
  .site-nav li{border-bottom:1px solid #f5f5f5}
  .site-nav a{display:block;padding:.75rem 0}
  .hero-ladder h1{font-size:1.28rem}
  .dual-cards{grid-template-columns:1fr}
  .step-num{width:2.4rem;height:2.4rem;font-size:.95rem}
}