/* Acfan 漫画 / 动漫夜场 · 暖炭黑 + 芥末黄 · 黑体 900 负字距 · 4px 小硬角 */
:root{
  --bg:#171513;
  --card:#211E1A;
  --ink:#F6F1E7;
  --dim:#A99E8B;
  --line:rgba(246,241,231,.16);
  --yellow:#E9B949;
  --yellow-d:#B98A24;
  --paper:#FFF9EC;
  --w:1180px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;
  font-size:15px;line-height:1.75;
}
img{max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,ol,ul,figure{margin:0}
ol,ul{padding:0;list-style:none}
.wrap{width:min(var(--w),calc(100% - 64px));margin:0 auto}

/* ---------- 顶栏 ---------- */
.top{background:rgba(23,21,19,.96);border-bottom:1px solid var(--line)}
.top-in{display:flex;align-items:center;gap:34px;height:78px}
.brand{display:flex;align-items:center;gap:11px;font-size:18px;font-weight:900;letter-spacing:.09em}
.brand i{font-style:normal;font-weight:500;letter-spacing:0;color:var(--dim);font-size:14px}
.brand img{display:block;width:34px;height:34px;border-radius:7px}
.nav{display:flex;gap:28px;margin-left:auto}
.nav a{font-size:13.5px;color:var(--dim);letter-spacing:.04em}
.nav a:hover{color:var(--yellow)}
.btn{
  height:46px;padding:0 24px;border:1px solid var(--yellow);background:transparent;color:var(--yellow);
  font-size:14px;font-weight:800;letter-spacing:.02em;border-radius:4px;
  align-items:center;justify-content:center;white-space:nowrap;
}
.btn:not([hidden]){display:inline-flex}
.btn.btn-p{background:var(--yellow);color:#1B1712}
.btn.btn-g{background:transparent;border-color:var(--line);color:var(--ink)}
.btn:hover{opacity:.88}
.top-cta{height:40px;padding:0 20px;font-size:13.5px}
html.no-dl .top-cta{display:none}

/* ---------- 首屏：巨字通栏 + 编号硬块 ---------- */
.hero{padding:76px 0 0}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) 268px;gap:64px;align-items:start}
.kick{font-size:11px;letter-spacing:.28em;color:var(--yellow);font-weight:700;margin-bottom:30px}
h1{
  font-size:clamp(48px,6vw,84px);line-height:1.14;font-weight:900;letter-spacing:-.04em;
  margin-bottom:28px;
}
.h1-narrow{display:none}
.lead{font-size:16px;line-height:1.95;color:var(--dim);max-width:600px}
.acts{display:flex;gap:12px;flex-wrap:wrap;margin-top:36px}
.hero-note{margin-top:22px;font-size:12.5px;color:var(--dim);letter-spacing:.04em}
.hero-side{border-top:4px solid var(--yellow);padding-top:18px}
.side-h{font-family:Georgia,serif;font-size:12px;letter-spacing:.26em;color:var(--yellow);font-weight:700;margin-bottom:12px}
.idx li{
  display:grid;grid-template-columns:42px minmax(0,1fr);column-gap:10px;
  padding:13px 0;border-bottom:1px solid var(--line);
}
.idx .in{grid-row:1 / 3;grid-column:1;font-family:Georgia,serif;font-size:19px;color:var(--yellow);line-height:1.35}
.idx b{grid-column:2;grid-row:1;font-size:14.5px;font-weight:800}
.idx small{grid-column:2;grid-row:2;font-size:12px;color:var(--dim);line-height:1.6}
.band{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  margin-top:76px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.band span{
  padding:22px 14px;text-align:center;font-size:13.5px;font-weight:700;letter-spacing:.06em;
  border-right:1px solid var(--line);
}
.band span:last-child{border-right:0}
.band span:nth-child(odd){color:var(--yellow)}

/* ---------- 通用区块 ---------- */
.sec{padding:112px 0;border-top:1px solid var(--line)}
.sec-alt{background:#1E1B17}
.sec-kick{font-size:11px;letter-spacing:.24em;color:var(--yellow);font-weight:700;margin-bottom:18px}
.sec h2,.dl h2{
  font-size:clamp(28px,2.9vw,38px);line-height:1.3;font-weight:900;letter-spacing:-.02em;
  margin-bottom:16px;
}
.sec-p,.dl-sub{font-size:15px;color:var(--dim);max-width:700px;line-height:1.9}

/* ---------- 功能：深色描边块 + 实心硬阴影 ---------- */
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:44px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:4px;
  padding:26px 24px 28px;box-shadow:5px 5px 0 rgba(233,185,73,.13);
}
.card .num{
  display:flex;align-items:center;justify-content:center;width:40px;height:40px;
  border-radius:4px;background:var(--yellow);color:#1B1712;
  font-family:Georgia,serif;font-size:16px;font-weight:700;margin-bottom:18px;
}
.card b{display:block;font-size:16px;font-weight:800;margin-bottom:10px}
.card p{font-size:14px;color:var(--dim);line-height:1.85}

/* ---------- 界面展示：左框右文 ---------- */
.shots-in{display:grid;grid-template-columns:340px minmax(0,1fr);gap:72px;align-items:center}
.viewer-wrap{background:#26221C;border:1px solid var(--line);border-radius:4px;padding:34px 18px 26px}
.viewer{width:300px;max-width:100%;margin:0 auto;position:relative}
.phone{background:var(--yellow);border-radius:8px;padding:8px;box-shadow:0 18px 38px -26px rgba(0,0,0,.9)}
.track{
  display:flex;overflow-x:auto;overscroll-behavior-x:contain;
  scroll-snap-type:x mandatory;scrollbar-width:none;border-radius:4px;
}
.track::-webkit-scrollbar{display:none}
.slide{flex:0 0 100%;margin:0;scroll-snap-align:center}
.slide img{display:block;width:100%;height:auto;border-radius:4px;pointer-events:none}
.arrow{
  position:absolute;top:50%;transform:translateY(-50%);z-index:2;
  width:30px;height:30px;border-radius:4px;border:1px solid var(--line);
  background:var(--card);color:var(--yellow);font-size:16px;line-height:1;
  padding:0;cursor:pointer;
}
.arrow:not([hidden]){display:flex;align-items:center;justify-content:center}
.arrow.prev{left:-42px}
.arrow.next{right:-42px}
.arrow[disabled]{opacity:.3;cursor:default}
.bar{margin-top:20px;display:flex;flex-direction:column;align-items:center;gap:10px}
.dots{display:flex;gap:7px}
.dots button{width:7px;height:7px;padding:0;border:0;border-radius:50%;background:#6A6152;cursor:pointer;transition:background .2s,width .2s}
.dots button[aria-current="true"]{background:var(--yellow);width:19px;border-radius:4px}
.now{margin:0;font-size:12.5px;color:var(--dim);letter-spacing:.04em}
.shots-copy h2{margin-bottom:18px}
.shots-fact{margin-top:28px;padding:18px 0 18px 20px;border-left:3px solid var(--yellow);font-size:14px;line-height:1.9;color:var(--dim)}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px}
.tag-list li{border:1px solid var(--line);border-radius:4px;color:var(--dim);font-size:12.5px;padding:6px 13px}

/* ---------- 下载：芥末黄整幅 + 深色入口卡 ---------- */
.dl{padding:112px 0;background:var(--yellow);color:#1B1712}
.dl:not(:has(a[data-channel]:not([hidden]))){display:none}
.dl .sec-kick{color:#6E5315}
.dl h2{color:#1B1712}
.dl-sub{color:#5C471C;margin-bottom:38px}
.dl-in{max-width:960px}
.dl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.dl-item{
  grid-template-columns:44px minmax(0,1fr) 24px;gap:12px;align-items:center;
  background:#1B1712;border-radius:4px;padding:20px 18px;
  box-shadow:5px 5px 0 rgba(27,23,18,.22);
}
.dl-item:not([hidden]){display:grid}
.dl-item:hover{background:#2B251C}
.dl-ico{
  display:flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:4px;background:rgba(233,185,73,.18);
  color:var(--yellow);font-size:14px;font-weight:800;
}
.dl-txt b{display:block;font-size:15px;font-weight:800;color:#FFF6E2}
.dl-txt small{display:block;font-size:12px;color:#BDB098;line-height:1.6;margin-top:3px}
.dl-ar{font-size:19px;color:var(--yellow);text-align:right}
.dl-check{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 34px;margin-top:34px}
.dl-check li{font-size:13px;color:#5C471C;padding-left:20px;position:relative;line-height:1.8}
.dl-check li::before{content:"✓";position:absolute;left:0;color:#1B1712;font-weight:800}
html.no-dl .dl-check{display:none}

/* ---------- 安装步骤 ---------- */
.step-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin-top:44px;border-top:1px solid var(--line)}
.step-list li{padding:28px 26px 8px 0;border-right:1px solid var(--line)}
.step-list li + li{padding-left:26px}
.step-list li:last-child{border-right:0}
.step-n{display:block;font-family:Georgia,serif;font-size:30px;color:var(--yellow);line-height:1;margin-bottom:16px}
.step-list b{display:block;font-size:16px;font-weight:800;margin-bottom:10px}
.step-list p{font-size:13.5px;color:var(--dim);line-height:1.9}

/* ---------- 问答 ---------- */
.faq-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 46px;margin-top:40px}
.faq-list details{border-bottom:1px solid var(--line);padding:18px 0}
.faq-list summary{font-size:15px;font-weight:700;cursor:pointer;list-style:none;position:relative;padding-right:26px}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";position:absolute;right:0;top:0;color:var(--yellow);font-size:18px;font-weight:700}
.faq-list details[open] summary::after{content:"−"}
.faq-list p{font-size:13.5px;color:var(--dim);line-height:1.9;padding-top:12px}

/* ---------- 页脚 ---------- */
.foot{background:#100E0C;color:#F1EADA;padding:76px 0 26px;border-top:1px solid var(--line)}
.foot-in{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:48px}
.foot-brand{display:flex;align-items:center;gap:12px;font-size:17px;font-weight:800;margin-bottom:16px}
.foot-brand img{width:40px;height:40px;border-radius:8px}
.foot-col p{font-size:13px;line-height:1.9;color:#9C927F;max-width:300px}
.foot-col b{display:block;font-size:13.5px;margin-bottom:16px;letter-spacing:.04em}
.foot-col a{display:block;font-size:12.5px;color:#9C927F;padding:4px 0}
.foot-col a:hover{color:var(--yellow)}
.foot-bot{display:flex;justify-content:space-between;gap:14px;border-top:1px solid var(--line);margin-top:54px;padding-top:20px;font-size:12px;color:#847B69}

/* ---------- 404 ---------- */
.nf-page{background:var(--bg);min-height:100vh;display:flex;align-items:center;justify-content:center}
.nf-in{text-align:center;padding:60px 24px;max-width:560px}
.nf-logo{width:88px;height:88px;border-radius:16px}
.nf-code{font-family:Georgia,serif;font-size:76px;line-height:1;color:var(--yellow);margin:22px 0 8px}
.nf-in h1{font-size:30px;margin-bottom:14px;letter-spacing:0}
.nf-p{font-size:14px;color:var(--dim);line-height:1.9;margin-bottom:26px}
.nf-small{font-size:12px;color:var(--dim);margin-top:26px}

/* ---------- 响应式 ---------- */
@media (max-width:1000px){
  .hero-grid,.shots-in{grid-template-columns:1fr;gap:44px}
  .shots-copy{order:-1}
  .viewer-wrap{max-width:400px;margin:0 auto;width:100%}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-in{grid-template-columns:repeat(2,minmax(0,1fr));gap:34px}
  .band{margin-top:52px}
}
@media (max-width:640px){
  .wrap{width:calc(100% - 36px)}
  .top-in{height:66px;gap:12px}
  .brand{font-size:15px}
  .brand i{font-size:12px}
  .nav{display:none}
  .top-cta{margin-left:auto}
  .hero{padding:52px 0 0}
  .hero-grid{padding-top:0}
  .h1-wide{display:none}
  .h1-narrow{display:inline}
  h1{font-size:44px;line-height:1.18}
  .lead{font-size:15px}
  .lead br{display:none}
  .band{grid-template-columns:repeat(2,minmax(0,1fr));margin-top:44px}
  .band span{padding:15px 6px;font-size:12.5px}
  .band span:nth-child(2){border-right:0}
  .band span:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .sec,.dl{padding:74px 0}
  .sec h2,.dl h2{font-size:27px}
  .grid{grid-template-columns:1fr;gap:14px}
  .card{padding:22px 20px 24px}
  .card p br{display:initial}
  .viewer{width:240px}
  .viewer-wrap{padding:24px 14px 22px}
  .arrow:not([hidden]){display:none}
  .dl-grid{grid-template-columns:1fr}
  .dl-check{grid-template-columns:1fr}
  .step-list{grid-template-columns:1fr}
  .step-list li,.step-list li + li{padding:22px 0;border-right:0;border-bottom:1px solid var(--line)}
  .step-list p br{display:initial}
  .faq-list{grid-template-columns:1fr}
  .foot-in{grid-template-columns:1fr;gap:30px}
  .foot-bot{flex-direction:column;gap:6px;margin-top:34px}
  .shots-fact br,.sec-p br{display:initial}
}