*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#292524;line-height:1.76;font-size:16px}
a{color:#c2410c;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

.site-header{background:#fff;border-bottom:2px solid #c2410c;position:sticky;top:0;z-index:340}
.header-inner{max-width:1180px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;position:relative}
.brand{display:flex;align-items:center;gap:10px;color:#1c1917;font-weight:600;font-size:.94rem}
.brand:hover{text-decoration:none}
.brand img{border-radius:7px}
.brand em{font-style:normal;color:#c2410c;font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none}
.site-nav a{color:#78716c;font-size:.9rem;padding:4px 0}
.site-nav a.active,.site-nav a:hover{color:#c2410c;font-weight:600;border-bottom:2px solid #ea580c;text-decoration:none}
.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:#44403c;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:#fff7ed;border-bottom:1px solid #fed7aa;padding:10px 0}
.applist-title{font-size:.78rem;color:#c2410c;text-align:center;margin-bottom:6px}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}

.vf-layout{display:grid;grid-template-columns:minmax(0,1fr) 210px;gap:34px;max-width:1180px;margin:0 auto;padding:28px 20px 40px}
.vf-content{min-width:0}

.vf-banner{background:linear-gradient(128deg,#7c2d12 0%,#c2410c 38%,#ffedd5 100%);border-radius:22px;padding:38px 34px 32px;margin-bottom:36px;color:#fff;scroll-margin-top:88px;position:relative;overflow:hidden}
.vf-banner::before{content:"";position:absolute;left:-30px;bottom:-30px;width:140px;height:140px;background:rgba(255,255,255,.07);border-radius:30% 70% 60% 40%;pointer-events:none}
.vf-banner .vf-label{display:inline-block;font-size:.76rem;font-weight:600;color:#7c2d12;background:#ffedd5;padding:5px 14px;border-radius:999px;margin-bottom:14px;position:relative;z-index:1}
.vf-banner h1{font-size:clamp(1.36rem,3.4vw,1.84rem);line-height:1.36;margin-bottom:14px;color:#fff;position:relative;z-index:1}
.vf-banner .vf-intro{color:#ffedd5;font-size:1.01rem;margin-bottom:10px;text-align:justify;position:relative;z-index:1}
.vf-banner .vf-intro:last-of-type{margin-bottom:0}
.vf-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;position:relative;z-index:1}
.vf-tags span{font-size:.78rem;padding:5px 12px;border-radius:999px;background:rgba(255,255,255,.16);color:#fff7ed;border:1px solid rgba(255,255,255,.32)}

.vf-chain{list-style:none;position:relative;padding:6px 0 12px 28px}
.vf-chain::before{content:"";position:absolute;left:11px;top:0;bottom:0;width:4px;background:linear-gradient(180deg,#ea580c,#fdba74 55%,#fed7aa);border-radius:4px}

.vf-segment{position:relative;padding:0 0 34px 24px;scroll-margin-top:88px}
.vf-segment:last-child{padding-bottom:6px}
.vf-segment__dot{position:absolute;left:-28px;top:10px;width:22px;height:22px;background:#fff;border:3px solid #ea580c;border-radius:50%;box-shadow:0 0 0 4px #ffedd5,0 3px 10px rgba(234,88,12,.25);z-index:2}
.vf-segment:nth-child(even) .vf-segment__dot{border-color:#c2410c;box-shadow:0 0 0 4px #fff7ed,0 3px 10px rgba(194,65,12,.22)}
.vf-segment__card{background:#fff;border:1px solid #fed7aa;border-radius:18px;padding:24px 26px;box-shadow:0 6px 22px rgba(194,65,12,.07);transition:transform .2s,box-shadow .2s}
.vf-segment:nth-child(even) .vf-segment__card{margin-left:12px;border-color:#fdba74}
.vf-segment:nth-child(odd) .vf-segment__card{margin-right:12px}
.vf-segment__card:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(194,65,12,.11)}
.vf-segment__card h2{font-size:1.16rem;margin-bottom:12px;color:#7c2d12;line-height:1.38}
.vf-segment__card p{margin-bottom:11px;color:#44403c;text-align:justify;font-size:.97rem}
.vf-segment__card figure{margin:18px 0 6px;border-radius:14px;overflow:hidden;border:1px solid #fed7aa;background:#fffbeb}
.vf-segment__card figcaption{font-size:.84rem;color:#78716c;padding:10px 14px;background:#fff7ed}
.vf-tip{background:#fff7ed;border-left:5px solid #ea580c;padding:14px 18px;margin:14px 0;border-radius:0 12px 12px 0;font-size:.93rem;color:#44403c}

.vf-qa{margin-top:18px;padding-top:28px;border-top:2px dotted #fdba74;scroll-margin-top:88px}
.vf-qa>h2{font-size:1.14rem;margin-bottom:16px;color:#7c2d12}
.vf-qa details{border:1px solid #fed7aa;margin-bottom:10px;background:#fff;border-radius:12px;overflow:hidden}
.vf-qa summary{padding:14px 18px;cursor:pointer;font-weight:500;list-style:none;color:#44403c}
.vf-qa summary::-webkit-details-marker{display:none}
.vf-qa details[open] summary{background:#fff7ed;border-bottom:1px solid #fed7aa;color:#c2410c}
.vf-qa details p{padding:14px 18px;color:#57534e;font-size:.94rem}

.vf-index{position:sticky;top:88px;align-self:start;background:#fff;border:2px solid #c2410c;border-radius:18px;padding:18px 14px;box-shadow:0 8px 26px rgba(194,65,12,.09)}
.vf-index h2{font-size:.82rem;color:#c2410c;margin-bottom:12px;letter-spacing:.02em}
.vf-index ol{list-style:none;counter-reset:vfidx}
.vf-index li{counter-increment:vfidx;margin-bottom:9px}
.vf-index a{font-size:.82rem;color:#c2410c;display:block;padding:4px 0 4px 10px;line-height:1.36;border-left:3px solid transparent;transition:border-color .15s,color .15s}
.vf-index a::before{content:counter(vfidx,decimal-leading-zero);display:inline-block;margin-right:7px;font-size:.68rem;font-weight:700;color:#ea580c;letter-spacing:.02em}
.vf-index a.is-active{color:#7c2d12;font-weight:600;text-decoration:none;border-left-color:#ea580c;background:#fff7ed;margin-left:-10px;padding-left:19px;border-radius:0 8px 8px 0}

.vf-more{max-width:1180px;margin:0 auto;padding:0 20px 44px}
.vf-more h2{font-size:1.04rem;margin-bottom:12px;color:#7c2d12}
.vf-more ul{list-style:none;display:flex;flex-wrap:wrap;gap:10px 20px}
.vf-more a{font-size:.92rem}

.site-footer{background:#fff7ed;border-top:2px solid #c2410c;padding:28px 20px;text-align:center;font-size:.88rem;color:#78716c}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:10px}
.footer-links a{color:#78716c}
.footer-sub{font-size:.82rem;color:#c2410c;margin-top:6px}

.prose-page{max-width:780px;margin:0 auto;padding:32px 20px 48px}
.prose-page h1{font-size:1.4rem;margin-bottom:16px;color:#7c2d12}
.prose-page p{margin-bottom:12px;color:#44403c}

.error-page{max-width:560px;margin:80px auto;padding:20px;text-align:center}
.error-page h1{font-size:3rem;color:#c2410c;margin-bottom:12px}

@media(max-width:920px){
.vf-layout{grid-template-columns:1fr}
.vf-index{order:-1;position:static;margin-bottom:12px}
.vf-segment:nth-child(even) .vf-segment__card,.vf-segment:nth-child(odd) .vf-segment__card{margin-left:0;margin-right:0}
.nav-toggle{display:flex}
.site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #fed7aa;padding:12px 20px;display:none;box-shadow:0 6px 16px rgba(0,0,0,.06)}
.site-nav.is-open{display:block}
.site-nav ul{flex-direction:column;gap:10px}
.vf-banner h1{font-size:1.3rem}
}