/* 功能详情页共享样式 —— 沿用 siyu 产品页配色与字体，桌面端大气、移动端不变 */
:root{
  --bg:#faf9f5; --bg-card:#ffffff; --text:#141413; --text-dim:#b0aea5;
  --accent:#d97757; --accent-dark:#c06547; --accent-light:#e8a08a; --accent-rgb:217,119,87;
  --gold:#d97757; --radius:16px; --radius-sm:12px; --border:#e8e6dc;
}
*{margin:0;padding:0;box-sizing:border-box;}
a{color:inherit;}
html{scroll-behavior:smooth;}
body{font-family:'Lora','PingFang SC','Microsoft YaHei',Georgia,serif;background:var(--bg);
  color:var(--text);line-height:1.85;-webkit-font-smoothing:antialiased;overflow-x:hidden;}
h1,h2,h3,h4{font-family:'Poppins','PingFang SC','Microsoft YaHei',Arial,sans-serif;}

/* 顶部返回栏 */
.fd-header{position:sticky;top:0;z-index:100;display:flex;align-items:center;gap:16px;
  flex-wrap:wrap;padding:14px 24px;background:rgba(250,249,245,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);max-width:1440px;margin:0 auto;}
.fd-header .back{color:var(--text-dim);text-decoration:none;font-family:'Poppins',sans-serif;
  font-size:14px;display:flex;align-items:center;gap:6px;transition:color .2s;white-space:nowrap;}
.fd-header .back:hover{color:var(--accent);}
.fd-header .crumb{font-size:13px;color:var(--text-dim);}
.fd-header .crumb b{color:var(--accent);font-weight:600;}
/* 本站 Logo：始终显示，点击返回首页 */
.site-brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;
  font-family:'Poppins','PingFang SC','Microsoft YaHei',sans-serif;font-weight:700;
  font-size:20px;color:var(--text);letter-spacing:.5px;flex-shrink:0;}
.site-brand .logo-mark{display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;background:var(--accent);color:#faf9f5;border-radius:9px;
  font-size:18px;font-weight:700;font-family:'PingFang SC','Microsoft YaHei',sans-serif;line-height:1;}
.site-brand .logo-text{letter-spacing:.5px;}
.site-brand:hover{opacity:.85;}


/* Hero */
.fd-hero{text-align:center;padding:64px 24px 36px;max-width:1440px;margin:0 auto;}
.fd-hero .big-icon{font-size:56px;margin-bottom:12px;}
.fd-hero h1{font-size:38px;font-weight:700;letter-spacing:-.5px;line-height:1.25;}
.fd-hero .tagline{margin:14px auto 0;max-width:720px;color:var(--text-dim);font-size:17px;}

/* 内容容器：外层大气(1440)，内层舒适阅读宽(≤900) */
.fd-content{max-width:1440px;margin:0 auto;padding:0 24px 70px;}
.fd-block{max-width:900px;margin:0 auto 52px;}
.fd-block h2{font-size:26px;font-weight:600;margin-bottom:22px;display:flex;align-items:center;gap:10px;}
.fd-block h2::before{content:'';width:4px;height:24px;background:var(--accent);border-radius:2px;}
.fd-block p{font-size:16px;color:#2a2a28;margin-bottom:14px;}
.fd-block ul{list-style:none;display:flex;flex-direction:column;gap:12px;margin:6px 0 0;}
.fd-block ul li{position:relative;padding-left:26px;font-size:16px;color:#2a2a28;}
.fd-block ul li::before{content:'▹';position:absolute;left:0;top:0;color:var(--accent);font-weight:700;}

/* 典型例子卡片 */
.fd-examples{display:grid;grid-template-columns:1fr;gap:16px;}
.fd-example{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:20px 22px;}
.fd-example h4{font-size:16px;font-weight:600;color:var(--accent);margin-bottom:6px;}
.fd-example p{font-size:15px;color:#2a2a28;margin:0;}

/* 有/无对比 */
.fd-compare-note{font-size:15px;color:var(--text-dim);margin-bottom:18px;}
.fd-compare-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:20px 22px;margin-bottom:16px;}
.fd-compare-item .scene{font-family:'Poppins',sans-serif;font-size:15px;font-weight:600;margin-bottom:12px;}
.fd-compare-cols{display:grid;grid-template-columns:1fr 1fr;gap:14px;}
.fd-col{padding:14px 16px;border-radius:10px;font-size:15px;line-height:1.7;}
.fd-col.no{background:rgba(180,180,180,.12);color:#6b6b66;}
.fd-col.yes{background:rgba(var(--accent-rgb),.10);color:var(--accent-dark);}
.fd-col .lab{display:block;font-family:'Poppins',sans-serif;font-weight:600;font-size:13px;margin-bottom:4px;}

/* 上手步骤 */
.fd-steps{counter-reset:step;list-style:none;display:flex;flex-direction:column;gap:14px;}
.fd-steps li{counter-increment:step;position:relative;padding-left:48px;font-size:16px;color:#2a2a28;min-height:34px;display:flex;align-items:center;}
.fd-steps li::before{content:counter(step);position:absolute;left:0;top:0;width:34px;height:34px;
  border-radius:50%;background:var(--accent);color:#fff;font-family:'Poppins',sans-serif;font-weight:600;
  font-size:15px;display:flex;align-items:center;justify-content:center;}

/* 组合使用 */
.fd-combo{font-size:16px;color:#2a2a28;background:var(--bg-card);border:1px solid var(--border);
  border-left:4px solid var(--accent);border-radius:var(--radius-sm);padding:20px 22px;}

/* 相关功能 */
.fd-related{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;}
.fd-related a{display:block;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:18px 20px;text-decoration:none;transition:transform .15s,border-color .15s;}
.fd-related a:hover{transform:translateY(-2px);border-color:var(--accent);}
.fd-related a .ri-ic{font-size:22px;}
.fd-related a .ri-t{font-family:'Poppins',sans-serif;font-weight:600;font-size:15px;margin:6px 0 2px;}
.fd-related a .ri-go{font-size:13px;color:var(--accent);}

/* FAQ */
.fd-faq{display:flex;flex-direction:column;gap:14px;}
.fd-faq .qa{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:18px 22px;}
.fd-faq .qa .q{font-family:'Poppins',sans-serif;font-weight:600;font-size:16px;color:var(--text);margin-bottom:6px;}
.fd-faq .qa .a{font-size:15px;color:#2a2a28;margin:0;}

/* 页脚 CTA */
.fd-footer{text-align:center;padding:40px 24px 70px;max-width:1440px;margin:0 auto;}
.fd-cta{display:inline-block;padding:14px 34px;background:var(--text);color:#fff;text-decoration:none;
  border-radius:999px;font-family:'Poppins',sans-serif;font-weight:500;font-size:15px;transition:transform .15s,box-shadow .15s;}
.fd-cta:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(20,20,19,.18);}

/* 列表页：功能卡片改为链接 */
.feature-item{display:block;text-decoration:none;color:inherit;cursor:pointer;}
.feature-item .fi-go{display:inline-block;margin-top:10px;font-family:'Poppins',sans-serif;font-size:13px;
  font-weight:500;color:var(--accent);}
.feature-item:hover .fi-go{text-decoration:underline;}

/* 桌面端加宽（与产品页一致：≥769 → 1296，≥1200 → 1440） */
@media (min-width:769px){
  .fd-content,.fd-hero,.fd-footer,.fd-header{max-width:1296px;}
  .fd-hero h1{font-size:46px;}
  .fd-block h2{font-size:28px;}
  .fd-examples{grid-template-columns:1fr 1fr;}
  .fd-related{grid-template-columns:repeat(3,1fr);}
}
@media (min-width:1200px){
  .fd-content,.fd-hero,.fd-footer,.fd-header{max-width:1440px;}
}
@media (max-width:768px){
  .fd-compare-cols{grid-template-columns:1fr;}
  .fd-hero{padding:44px 18px 28px;}
  .fd-hero h1{font-size:30px;}
  .fd-block{max-width:100%;}
  .fd-block h2{font-size:22px;}
}

/* 吸顶锚点导航（详情页） */
.fd-anchor-nav{position:sticky;top:62px;z-index:90;background:rgba(250,249,245,.95);
  backdrop-filter:blur(10px);border-bottom:1px solid var(--border);max-width:1440px;margin:0 auto;}
.fd-anchor-nav .an-inner{display:flex;gap:8px;overflow-x:auto;padding:9px 24px;max-width:1440px;margin:0 auto;}
.fd-anchor-nav a{white-space:nowrap;text-decoration:none;font-family:'Poppins',sans-serif;font-size:14px;
  color:var(--text-dim);padding:6px 14px;border-radius:999px;transition:.2s;}
.fd-anchor-nav a:hover{color:var(--accent);background:rgba(var(--accent-rgb),.10);}
.fd-block{scroll-margin-top:var(--sticky-h,140px);}
@media (max-width:768px){.fd-anchor-nav{top:56px;}.fd-anchor-nav .an-inner{padding:8px 16px;}}
/* 锚点导航：当前区块激活态（滚动/点击都高亮） */
.fd-anchor-nav a.active{color:var(--accent);background:rgba(var(--accent-rgb),.14);font-weight:700;}