:root{
  --paper:#F7F4ED; --ink:#1A1714; --sub:#6B6358; --line:#D8D0C4;
  --ac:#C8402F; --ink-2:#14111C; --paper-2:#EFEAE0;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--paper);color:var(--ink);line-height:1.75;font-size:17px;-webkit-font-smoothing:antialiased}
.serif{font-family:"Noto Serif SC","Songti SC",serif}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 32px}
/*sec*/
.sec-paper{background:var(--paper)}
.sec-ink{background:var(--ink-2);color:#EDE9F5}
.sec-ink .sec-p,.sec-ink .sec-kick{color:#B9B2C9}
.sec-kick{font-size:13px;letter-spacing:.32em;color:var(--ac);text-transform:uppercase;margin-bottom:18px}
.sec-kick.light{color:var(--ac)}
h2{font-size:42px;font-weight:700;line-height:1.25;margin-bottom:18px}
.sec-p{font-size:18px;color:var(--sub);margin-bottom:8px}

/* 顶栏 */
.top{position:sticky;top:0;z-index:50;background:rgba(247,244,237,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top-in{max-width:1080px;margin:0 auto;padding:14px 32px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-family:"Noto Serif SC",serif;font-weight:700;font-size:21px}
.brand img{border-radius:8px}
.top-nav{margin-left:auto;display:flex;gap:26px;font-size:15px;color:var(--sub)}
.top-nav a:hover{color:var(--ac)}
.top-cta{background:var(--ac);color:#fff;padding:9px 22px;border-radius:2px;font-size:15px;font-weight:600}
.top-cta:hover{opacity:.9}

/* 报头首屏 */
.masthead{padding:104px 0 92px}
.kicker{font-size:14px;letter-spacing:.3em;color:var(--ac);margin-bottom:26px}
.masthead h1{font-family:"Noto Serif SC",serif;font-size:80px;font-weight:700;line-height:1.12;margin-bottom:34px;letter-spacing:.01em}
.lead{font-size:20px;max-width:680px;color:var(--sub);margin-bottom:40px}
.mast-btns{display:flex;gap:16px}
.btn{display:inline-block;padding:15px 34px;border-radius:2px;font-size:16px;font-weight:600}
.btn-p{background:var(--ac);color:#fff}
.btn-g{border:1px solid var(--ink);color:var(--ink)}
.btn-g:hover{background:var(--ink);color:var(--paper)}

/* 编号编辑列表 */
.edit-list{list-style:none;margin-top:46px;border-top:1px solid var(--line)}
.edit-list li{display:flex;gap:34px;padding:30px 0;border-bottom:1px solid var(--line);align-items:baseline}
.edit-list .num{font-family:"Noto Serif SC",serif;font-size:30px;color:var(--ac);min-width:54px;font-weight:700}
.edit-list b{display:block;font-size:22px;margin-bottom:8px}
.edit-list p{color:var(--sub);font-size:16px;max-width:760px}

/* 界面展示 - 窄手机框 */
.show-in{display:grid;grid-template-columns:1fr 300px;gap:60px;align-items:center}
.viewer-wrap{position:relative}
.viewer.narrow .phone{border:1px solid var(--line);border-radius:30px;padding:14px;background:#000;box-shadow:0 18px 40px rgba(0,0,0,.35)}
.phone{overflow:hidden}
.track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;gap:0;scrollbar-width:none}
.track::-webkit-scrollbar{display:none}
.slide{scroll-snap-align:start;flex:0 0 100%;margin:0}
.slide img{width:100%;height:auto;border-radius:16px}
.arrow{position:absolute;top:42%;transform:translateY(-50%);width:42px;height:42px;border-radius:50%;border:none;background:rgba(255,255,255,.9);color:#1A1714;font-size:22px;cursor:pointer;z-index:3}
.arrow.prev{left:-18px}
.arrow.next{right:-18px}
.arrow:hover{background:#fff}
.bar{display:flex;align-items:center;gap:14px;margin-top:18px;justify-content:center}
.dots{display:flex;gap:8px}
.dots button{width:8px;height:8px;border-radius:50%;border:none;background:var(--line);cursor:pointer;padding:0}
.dots button[aria-current="true"]{background:var(--ac);width:22px;border-radius:4px}
.now{font-size:14px;color:#B9B2C9;min-width:64px}

/* 下载 - 商店按钮 */
.store{display:flex;flex-wrap:wrap;gap:16px;margin:40px 0 26px}
.store:not([hidden]){display:flex}
.store-btn{display:flex;align-items:center;gap:14px;background:var(--ink);color:#fff;padding:16px 24px;border-radius:4px;min-width:210px}
.store-btn:hover{background:#000}
.sb-ico{font-size:20px;color:var(--ac)}
.sb-tx{display:flex;flex-direction:column;line-height:1.3}
.sb-tx b{font-size:17px}
.sb-tx i{font-style:normal;font-size:13px;color:#B9B2C9}
.check{list-style:none;max-width:680px}
.check li{position:relative;padding-left:26px;margin-bottom:12px;color:var(--sub);font-size:15px}
.check li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;background:var(--ac);border-radius:1px}
.no-dl .dl{display:none}
.no-dl .top-cta{display:none}

/* 安装步骤 */
.steps{list-style:none;margin-top:46px;display:grid;grid-template-columns:repeat(2,1fr);gap:34px 50px}
.steps li{display:flex;gap:20px;align-items:baseline;border-top:1px solid #34303f;padding-top:22px}
.step-n{font-family:"Noto Serif SC",serif;font-size:26px;color:var(--ac);font-weight:700}
.steps b{display:block;font-size:19px;margin-bottom:7px}
.steps p{color:#B9B2C9;font-size:15px}

/* 问答 */
.qa{margin-top:40px;max-width:820px}
.topic{margin-top:34px;color:var(--sub);font-size:16px;max-width:820px}
.qa details{border-bottom:1px solid var(--line);padding:22px 0}
.qa summary{cursor:pointer;font-size:18px;font-weight:600;list-style:none;position:relative;padding-right:30px}
.qa summary::after{content:"+";position:absolute;right:0;top:0;font-size:22px;color:var(--ac)}
.qa details[open] summary::after{content:"\2013"}
.qa p{color:var(--sub);font-size:16px;margin-top:14px;max-width:720px}

/* 页脚 */
.ft{background:var(--ink-2);color:#C8C2D4;padding:74px 0 40px}
.ft-in{display:grid;grid-template-columns:repeat(4,1fr);gap:40px;max-width:1080px;margin:0 auto;padding:0 32px}
.ft-col b{display:block;color:#fff;font-size:15px;margin-bottom:18px;font-weight:700}
.ft-col a{display:block;color:#A89FB8;font-size:15px;margin-bottom:12px}
.ft-col a:hover{color:var(--ac)}
.ft-copy{text-align:center;margin-top:54px;color:#7C7488;font-size:14px;max-width:1080px;margin-left:auto;margin-right:auto;padding:0 32px}

@media(max-width:900px){
  .wrap{padding:0 22px}
  .sec{padding:84px 0}
  .masthead{padding:90px 0 80px}
  .masthead h1{font-size:52px}
  h2{font-size:32px}
  .show-in{grid-template-columns:1fr;gap:40px}
  .viewer.narrow{margin:0 auto;max-width:280px}
  .steps{grid-template-columns:1fr}
  .ft-in{grid-template-columns:repeat(2,1fr)}
  .top-nav{display:none}
}
@media(max-width:480px){
  .masthead h1{font-size:42px}
  .store-btn{min-width:100%}
}

/* 404 */
.nf-wrap{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;background:var(--ink-2);color:#EDE9F5;padding:40px}
.nf-code{font-family:"Noto Serif SC",serif;font-size:120px;color:var(--ac);line-height:1;margin-bottom:10px}
.nf-h{font-size:26px;margin-bottom:14px}
.nf-p{color:#B9B2C9;margin-bottom:30px;max-width:480px}
.nf-btn{background:var(--ac);color:#fff;padding:13px 30px;border-radius:2px;font-weight:600}
.nf-btn:hover{opacity:.9}