*,*::before,*::after{box-sizing:border-box}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a1a;background:#fff;line-height:1.78}
img{display:block;max-width:100%;height:auto}
a{color:#c2410c;text-decoration:none}
a:hover{text-decoration:underline}
.w{width:min(1080px,calc(100% - 32px));margin:0 auto}

.bar{position:sticky;top:0;z-index:60;background:#fff;border-bottom:1px solid #e8e8e8}
.bar-in{display:flex;align-items:center;justify-content:space-between;min-height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;color:#111}
.logo img{width:38px;border-radius:10px}
.nav{display:flex;gap:18px;align-items:center}
.nav a{color:#555;font-size:14px}
.ham{display:none;border:1px solid #ddd;background:#fff;border-radius:8px;padding:8px 12px;cursor:pointer}
.mnav{display:none;flex-direction:column;padding:12px 16px 18px;border-top:1px solid #eee;background:#fff}
.mnav.on{display:flex}
.mnav a{padding:10px 0;border-bottom:1px solid #f4f4f4;color:#444;font-size:14px}

.ads-wrap{background:#fff}

.hero{padding:48px 0 32px;text-align:center;border-bottom:1px solid #f0f0f0}
.hero h1{font-size:clamp(26px,4.2vw,38px);line-height:1.28;margin:0 0 16px;color:#111;letter-spacing:-.02em}
.hero .lead{color:#555;font-size:16px;max-width:740px;margin:0 auto}
.hero .chips{margin-top:22px;display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hero .chip{display:inline-block;padding:6px 14px;border:1px solid #fed7aa;border-radius:999px;font-size:13px;color:#9a3412;background:#fff7ed}
.hero .ext-links{margin-top:20px;font-size:14px;color:#666}
.hero .ext-links a{margin:0 6px}

.feat-sec{padding:52px 0;background:#fff}
.feat-sec.alt{background:#fafafa;border-top:1px solid #f0f0f0;border-bottom:1px solid #f0f0f0}
.feat-head{text-align:center;margin-bottom:36px}
.feat-head h2{font-size:clamp(22px,3.2vw,30px);margin:0 0 10px;color:#111}
.feat-head p{color:#666;font-size:15px;max-width:640px;margin:0 auto}

.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat-block{padding:28px 24px;border:1px solid #ececec;border-radius:14px;background:#fff;transition:box-shadow .2s,border-color .2s}
.feat-block:hover{border-color:#fed7aa;box-shadow:0 8px 28px rgba(234,88,12,.08)}
.feat-icon{font-size:36px;line-height:1;margin-bottom:14px;display:block}
.feat-block h3{margin:0 0 10px;font-size:17px;color:#111}
.feat-block p{margin:0;color:#555;font-size:14px;line-height:1.82}

.prose-sec{padding:48px 0 56px}
.prose-sec h2{font-size:22px;margin:32px 0 14px;color:#222}
.prose-sec h2:first-child{margin-top:0}
.prose-sec p,.prose-sec li{color:#444;font-size:15px}
.prose-sec ul,.prose-sec ol{padding-left:22px;margin:0 0 16px}
.callout{margin:24px 0;padding:16px 18px;border-left:3px solid #ea580c;background:#fff7ed;color:#444;font-size:14px;line-height:1.75;border-radius:0 8px 8px 0}
.thumb-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}
.thumb-row figure{margin:0}
.thumb-row figcaption{font-size:12px;color:#888;margin-top:6px;text-align:center}

.guide-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:36px 0 0}
.guide-card{display:block;padding:20px;border:1px solid #e8e8e8;border-radius:12px;background:#fafafa;color:#111}
.guide-card:hover{border-color:#fed7aa;text-decoration:none}
.guide-card span{display:block;margin-top:6px;font-size:13px;color:#888;font-weight:400}

.faq{padding:48px 0 64px;background:#fafafa;border-top:1px solid #eee}
.faq h2{font-size:26px;margin:0 0 24px;text-align:center}
.faq details{border:1px solid #e8e8e8;border-radius:12px;padding:16px 20px;margin-bottom:12px;background:#fff}
.faq summary{font-weight:600;cursor:pointer;color:#222}
.faq p{margin:12px 0 0;color:#555;font-size:14px}

.prose{padding:40px 0 56px}
.prose h1{font-size:28px;margin:0 0 16px}
.prose h2{font-size:20px;margin:28px 0 12px;color:#222}
.prose p,.prose li{color:#444;font-size:15px}
.prose ul{padding-left:20px}
.related{margin-top:36px;padding:20px;border:1px solid #e8e8e8;border-radius:12px;background:#fafafa}
.related h3{margin:0 0 12px;font-size:16px}
.related a{display:block;padding:6px 0;color:#c2410c;font-size:14px}

.ftr{padding:36px 0;background:#fafafa;border-top:1px solid #eee;font-size:13px;color:#888;text-align:center}
.ftr a{color:#666;margin:0 10px}
.ftr p{margin:12px 0 0}

.err{min-height:60vh;display:grid;place-items:center;text-align:center;padding:40px 16px}
.err h1{font-size:48px;margin:0 0 12px;color:#ccc}

@media(max-width:820px){
  .feat-grid{grid-template-columns:1fr}
  .guide-row,.thumb-row{grid-template-columns:1fr}
  .ham{display:inline-flex}
  .nav{display:none}
}