*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#1a1a1a;line-height:1.75;font-size:16px}
a{color:#e65100;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:1080px;margin:0 auto;padding:0 20px}

.site-header{background:#fff;border-bottom:1px solid #e8e8e8;position:sticky;top:0;z-index:100}
.header-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px;font-size:1.05rem;color:#1a1a1a;font-weight:500}
.brand:hover{text-decoration:none}
.brand b{color:#e65100;font-weight:700}
.site-nav ul{display:flex;gap:6px 18px;list-style:none;flex-wrap:wrap}
.site-nav a{color:#444;font-size:.92rem;padding:4px 0}
.site-nav a.active{color:#e65100;font-weight:600;border-bottom:2px solid #e65100}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:#333;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)}

.ads-top-bar{background:#fafafa;border-bottom:1px solid #eee;padding:10px 0}
.applist-title{font-size:.78rem;color:#888;text-align:center;margin-bottom:6px;letter-spacing:.05em}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#ads .caption{font-size:.7rem;color:#666;margin-top:4px;text-align:center;max-width:70px;line-height:1.3}

.hero-timeline{padding:40px 0 28px;border-bottom:1px solid #eee}
.hero-kicker{font-size:.82rem;font-weight:600;letter-spacing:.08em;color:#e65100;text-transform:uppercase;margin-bottom:12px}
.hero-timeline h1{font-size:1.68rem;line-height:1.38;margin-bottom:18px;color:#111;max-width:820px}
.hero-timeline .lead{color:#444;margin-bottom:14px;font-size:1.02rem;max-width:820px}
.hero-timeline .lead:last-of-type{margin-bottom:20px}
.progress-track{height:4px;background:#f0f0f0;border-radius:2px;overflow:hidden;max-width:820px}
.progress-fill{height:100%;width:0;background:linear-gradient(90deg,#ff9800,#e65100);border-radius:2px;transition:width .25s ease}

.timeline-shell{display:grid;grid-template-columns:200px 1fr;gap:36px;padding:36px 0 20px;align-items:start}
.timeline-rail{position:sticky;top:88px}
.timeline-rail ol{list-style:none;position:relative;padding-left:0}
.timeline-rail ol::before{content:"";position:absolute;left:18px;top:18px;bottom:18px;width:2px;background:#ffccbc}
.timeline-rail li{margin-bottom:2px}
.rail-link{display:flex;align-items:center;gap:12px;padding:12px 0;font-size:.88rem;color:#555;transition:color .15s}
.rail-num{flex-shrink:0;width:36px;height:36px;border-radius:50%;background:#fff;border:2px solid #ffccbc;color:#e65100;font-size:.85rem;font-weight:700;display:flex;align-items:center;justify-content:center;position:relative;z-index:1;transition:all .2s}
.rail-label{line-height:1.3}
.rail-link:hover,.rail-link.is-active{color:#e65100;text-decoration:none}
.rail-link.is-active .rail-num{background:#e65100;border-color:#e65100;color:#fff;box-shadow:0 0 0 4px rgba(230,81,0,.15)}

.timeline-cards{display:flex;flex-direction:column;gap:32px}
.step-card{background:#fff;border:1px solid #e8e8e8;border-radius:12px;padding:28px 28px 24px;scroll-margin-top:96px;position:relative}
.step-card::before{content:"";position:absolute;left:0;top:28px;bottom:28px;width:4px;background:#ffccbc;border-radius:0 4px 4px 0}
.step-card.is-active{border-color:#ffcc80;box-shadow:0 2px 12px rgba(230,81,0,.08)}
.step-card.is-active::before{background:#e65100}
.step-head{margin-bottom:16px;padding-left:8px}
.step-badge{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.06em;color:#e65100;background:#fff3e0;padding:3px 10px;border-radius:4px;margin-bottom:8px}
.step-head h2{font-size:1.16rem;color:#111;line-height:1.4}
.step-body{padding-left:8px;margin-bottom:18px}
.step-body p{margin-bottom:10px;color:#333;font-size:.97rem}
.step-body p:last-child{margin-bottom:0}
.callout{background:#fff3e0;border-left:3px solid #e65100;padding:12px 16px;margin:14px 0;border-radius:0 6px 6px 0;font-size:.93rem;color:#bf360c}
.step-figure{border-radius:8px;overflow:hidden;border:1px solid #eee;margin-left:8px}
.step-figure figcaption{font-size:.82rem;color:#777;padding:8px 12px;background:#fafafa}

.faq{padding:36px 0 48px;border-top:1px solid #eee}
.faq h2{font-size:1.25rem;margin-bottom:18px;color:#111}
.faq details{border:1px solid #e8e8e8;border-radius:8px;margin-bottom:10px;padding:0}
.faq summary{padding:14px 18px;cursor:pointer;font-weight:500;color:#222;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq details[open] summary{border-bottom:1px solid #eee;background:#fafafa}
.faq details p{padding:14px 18px;color:#444;font-size:.95rem}

.site-footer{background:#fafafa;border-top:1px solid #eee;padding:28px 0;margin-top:20px;text-align:center;font-size:.88rem;color:#666}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:10px}
.footer-links a{color:#555}

.prose-page{padding:32px 0 48px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page h2{font-size:1.15rem;margin:24px 0 10px;color:#222}
.prose-page p{margin-bottom:12px;color:#333}
.error-page{text-align:center;padding:48px 0 24px}
.error-page h1{font-size:3rem;color:#e65100}

@media(max-width:860px){
  .timeline-shell{grid-template-columns:1fr}
  .timeline-rail{position:static;margin-bottom:12px;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .timeline-rail ol{display:flex;gap:8px;padding-bottom:8px}
  .timeline-rail ol::before{display:none}
  .rail-link{flex-direction:column;gap:6px;padding:8px 12px;min-width:72px;text-align:center;border:1px solid #eee;border-radius:8px;background:#fafafa}
  .rail-num{width:32px;height:32px;font-size:.78rem}
  .rail-label{font-size:.75rem}
  .step-card{padding:20px 18px 18px}
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #eee;padding:12px 20px;display:none}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:10px}
  .site-header{position:relative}
  .header-row{position:relative}
}