*,*::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:1.78;font-size:16px}
a{color:#be123c;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:960px;margin:0 auto;padding:0 20px}

.site-header{background:#fff;border-bottom:1px solid #ececec;position:sticky;top:0;z-index:100}
.header-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;position:relative}
.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:#be123c;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:#be123c;font-weight:600;border-bottom:2px solid #be123c}
.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-zig{padding:38px 0 24px;text-align:center;border-bottom:1px solid #f3f3f3}
.hero-zig h1{font-size:1.68rem;line-height:1.4;margin-bottom:16px;color:#111;max-width:740px;margin-left:auto;margin-right:auto}
.hero-zig .lead{color:#444;margin-bottom:12px;font-size:1.02rem;max-width:700px;margin-left:auto;margin-right:auto;text-align:left}
.hero-zig .lead:last-of-type{margin-bottom:0}

.zig-layout{display:grid;grid-template-columns:180px 1fr;gap:28px;padding:32px 0 48px;align-items:start}
.zig-nav{position:sticky;top:72px}
.zig-nav-title{font-size:.78rem;color:#888;letter-spacing:.08em;margin-bottom:12px;text-transform:uppercase}
.zig-nav ol{list-style:none;counter-reset:step}
.zig-nav li{counter-increment:step;margin-bottom:6px}
.zig-nav a{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:6px;font-size:.88rem;color:#555;transition:.15s}
.zig-nav a:hover{background:#fff1f2;color:#be123c;text-decoration:none}
.zig-nav a::before{content:counter(step,decimal-leading-zero);font-size:.72rem;font-weight:700;color:#be123c;min-width:22px}
.zig-nav a.is-active{background:#fff1f2;color:#be123c;font-weight:600}

.zig-track{display:flex;flex-direction:column;gap:0;position:relative}
.zig-track::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;background:repeating-linear-gradient(to bottom,#fecdd3 0,#fecdd3 8px,transparent 8px,transparent 16px);transform:translateX(-50%);z-index:0}

.milestone{position:relative;width:calc(50% - 24px);padding:24px 22px;background:#fff;border:1px solid #f0f0f0;border-radius:8px;box-shadow:0 2px 8px rgba(0,0,0,.03);margin-bottom:36px;z-index:1}
.milestone:nth-child(odd){align-self:flex-start;margin-right:auto}
.milestone:nth-child(even){align-self:flex-end;margin-left:auto}
.milestone-badge{position:absolute;top:-14px;left:22px;background:#be123c;color:#fff;font-size:.75rem;font-weight:700;padding:4px 12px;border-radius:20px;letter-spacing:.04em}
.milestone:nth-child(even) .milestone-badge{left:auto;right:22px}
.milestone h2{font-size:1.14rem;margin:8px 0 12px;color:#222}
.milestone p{margin-bottom:10px;color:#333}
.milestone figure{margin:16px 0}
.milestone figcaption{font-size:.85rem;color:#777;margin-top:6px}
.milestone .tip{background:#fff1f2;border-left:3px solid #be123c;padding:12px 16px;margin:12px 0;font-size:.94rem;color:#444;border-radius:0 4px 4px 0}

.site-footer{background:#fafafa;border-top:1px solid #eee;padding:28px 0;margin-top:8px;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:#be123c}

@media(max-width:768px){
  .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;box-shadow:0 4px 12px 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 #f0f0f0}
  .site-nav a{display:block;padding:12px 0}
  .hero-zig h1{font-size:1.32rem}
  .zig-layout{grid-template-columns:1fr;gap:0}
  .zig-nav{position:static;margin-bottom:20px;padding-bottom:12px;border-bottom:1px solid #f0f0f0}
  .zig-nav ol{display:flex;flex-wrap:wrap;gap:6px}
  .zig-nav li{margin-bottom:0}
  .zig-track::before{display:none}
  .milestone{width:100%;margin-left:0!important;margin-right:0!important}
  .milestone-badge{left:22px!important;right:auto!important}
}