:root{
  --brand:#0fc468;
  --brand-light:#32e6b9;
  --purple:#6c4dff;
  --ink:#191a23;
  --ink-soft:#1a1a1a;
  --text-mid:#4a4d5c;
  --text-light:#858699;
  --bg-soft:#f8f9fa;
  --border-soft:#e5e5e5;
  --border:#cfd2dc;
  --shadow-md:0 6px 18px rgba(25,26,35,.07);
  --shadow-lg:0 20px 50px -12px rgba(25,26,35,.18);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'PingFang SC','Microsoft YaHei','Hiragino Sans GB',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  color:var(--text-mid);background:#fff;line-height:1.7;font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
/* ===== 顶部栏 ===== */
.pp-header{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border-soft);
}
.pp-header-inner{
  max-width:1180px;margin:0 auto;padding:0 24px;height:64px;
  display:flex;align-items:center;justify-content:space-between;
}
.pp-logo{display:flex;align-items:center}
.brand-logo{width:120px;height:24px;display:block;flex-shrink:0;max-width:none}
.pp-back{
  font-size:14px;color:var(--ink);border:1.5px solid var(--border);padding:8px 18px;border-radius:999px;
  transition:.25s;font-weight:500;
}
.pp-back:hover{border-color:var(--brand);color:var(--brand)}
/* ===== Hero ===== */
.pp-hero{background:linear-gradient(180deg,#f3fbf8 0%,#fff 100%);padding:56px 24px 40px;text-align:center;border-bottom:1px solid var(--border-soft)}
.pp-hero h1{font-size:32px;font-weight:700;color:var(--ink);letter-spacing:-.5px;margin-bottom:14px;font-family:'PingFang SC',sans-serif}
.pp-hero .meta{font-size:13px;color:var(--text-light);display:flex;gap:18px;justify-content:center;flex-wrap:wrap;margin-bottom:18px}
.pp-hero .meta b{color:var(--brand);font-weight:600}
.pp-hero .intro{max-width:780px;margin:0 auto;font-size:14px;color:var(--text-mid);line-height:1.85}
/* ===== 布局 ===== */
.pp-layout{max-width:1180px;margin:40px auto;padding:0 24px;display:flex;gap:48px;align-items:flex-start}
.pp-toc{position:sticky;top:88px;width:240px;flex-shrink:0;border-left:2px solid var(--border-soft);padding-left:18px}
.pp-toc h4{font-size:13px;color:var(--text-light);font-weight:600;margin-bottom:12px;letter-spacing:.5px}
.pp-toc a{display:block;font-size:13.5px;color:var(--text-mid);padding:7px 0;border-radius:6px;transition:.2s;line-height:1.4}
.pp-toc a:hover{color:var(--brand);padding-left:6px}
.pp-toc a.active{color:var(--brand);font-weight:600}
.pp-main{flex:1;min-width:0;max-width:760px}
/* ===== 章节 ===== */
.pp-section{margin-bottom:44px;scroll-margin-top:88px}
.pp-section > h2{
  font-size:21px;font-weight:700;color:var(--ink);margin-bottom:16px;
  font-family:'PingFang SC',sans-serif;position:relative;padding-left:14px;
}
.pp-section > h2::before{content:'';position:absolute;left:0;top:6px;bottom:6px;width:4px;border-radius:2px;background:linear-gradient(180deg,var(--brand),var(--brand-light))}
.pp-section h3{font-size:16px;font-weight:600;color:var(--ink);margin:22px 0 10px}
.pp-section p{font-size:14.5px;color:var(--text-mid);margin-bottom:14px;line-height:1.9}
.pp-section ul{margin:0 0 16px 0;padding-left:0;list-style:none}
.pp-section ul li{font-size:14.5px;color:var(--text-mid);padding:9px 14px;margin-bottom:8px;background:var(--bg-soft);border-radius:8px;border-left:3px solid var(--border-soft);line-height:1.7}
.pp-section ol{margin:0 0 16px 22px;padding-left:4px}
.pp-section ol li{font-size:14.5px;color:var(--text-mid);margin-bottom:10px;line-height:1.85;padding-left:4px}
/* ===== 隐私信息高亮 ===== */
mark.hl{
  color:var(--brand);font-weight:700;background:rgba(15,196,104,.10);
  padding:0 3px;border-radius:3px;
}
.pp-tip{
  background:linear-gradient(135deg,rgba(15,196,104,.08),rgba(50,230,185,.05));
  border:1px solid rgba(15,196,104,.25);border-radius:10px;padding:12px 16px;
  font-size:13px;color:var(--text-mid);margin-bottom:20px;
}
.pp-tip b{color:var(--brand)}
/* ===== 底部 ===== */
.pp-footer{background:var(--ink);color:rgba(255,255,255,.6);padding:32px 24px;text-align:center;font-size:13px;margin-top:40px}
.pp-footer a{color:var(--brand-light)}
/* ===== 响应式 ===== */
@media(max-width:900px){
  .pp-layout{flex-direction:column;gap:24px}
  .pp-toc{position:static;width:100%;border-left:none;border-top:2px solid var(--border-soft);padding:18px 0 0}
  .pp-toc a{display:inline-block;margin:0 14px 8px 0}
  .pp-hero h1{font-size:26px}
}