/* popiku · popikuapp.cn — 画册排版骨架 */
:root{
  --paper:#F5F2EA;
  --paper-2:#EFEADF;
  --ink:#131211;
  --ink-2:#514C44;
  --ink-3:#8C8577;
  --line:#D8D1C2;
  --accent:#E8441C;
  --dark:#141312;
  --white:#fff;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  font-size:16px;line-height:1.76;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
.wrap{width:min(1120px,92%);margin:0 auto}

.btn{
  display:inline-flex;align-items:center;gap:9px;
  background:var(--accent);color:#fff;font-weight:800;font-size:15px;
  padding:14px 26px;border-radius:2px;
  transition:background .16s ease,transform .16s ease;
}
.btn svg{width:18px;height:18px}
.btn:hover{background:#C93510;transform:translateY(-1px)}
.ghost{
  display:inline-flex;align-items:center;padding:13px 20px;border-radius:2px;
  font-weight:700;font-size:14.6px;border:1px solid var(--ink);
  transition:background .16s ease,color .16s ease;
}
.ghost:hover{background:var(--ink);color:var(--paper)}

/* header */
.top{position:sticky;top:0;z-index:70;background:rgba(245,242,234,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.top.on{box-shadow:0 8px 24px rgba(19,18,17,.06)}
.top-in{display:flex;align-items:center;height:66px;gap:22px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{border-radius:4px}
.brand-t b{display:block;font-size:17.5px;line-height:1.1;letter-spacing:.02em}
.brand-t small{display:block;font-size:10.5px;letter-spacing:.18em;color:var(--ink-3)}
.nav{margin-left:auto;display:flex;gap:24px}
.nav a{font-size:14px;color:var(--ink-2);padding:6px 0;border-bottom:1.5px solid transparent;letter-spacing:.14em}
.nav a:hover{color:var(--ink);border-color:var(--accent)}
.nav-toggle{display:none;margin-left:auto;background:none;border:0;padding:6px;color:var(--ink);cursor:pointer}
.cta{background:var(--ink);color:var(--paper);font-weight:800;font-size:13.6px;padding:10px 18px;border-radius:2px;letter-spacing:.06em;transition:background .15s ease}
.cta:hover{background:var(--accent);color:#fff}

/* hero */
.hero{padding:70px 0 56px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:54px;align-items:center}
.kick{display:inline-flex;align-items:center;gap:9px;font-size:11px;letter-spacing:.3em;font-weight:700;color:var(--accent)}
.kick::before{content:"";width:24px;height:1px;background:var(--accent)}
h1{
  font-family:"Songti SC","STSong","SimSun",serif;
  font-size:clamp(58px,8.4vw,104px);line-height:.94;letter-spacing:-.03em;
  margin:14px 0 10px;font-weight:900;
}
.lead{font-family:"Songti SC","STSong",serif;font-size:22px;font-weight:700;margin-bottom:12px}
.desc{font-size:15.2px;color:var(--ink-2);max-width:562px}
.acts{display:flex;gap:12px;flex-wrap:wrap;margin:26px 0 26px}
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;border-top:1px solid var(--line);padding-top:18px;max-width:540px}
.facts b{display:block;font-size:14px;letter-spacing:.04em}
.facts span{display:block;font-size:12.4px;color:var(--ink-3);margin-top:2px}

/* 画框拼贴 */
.frames{position:relative;padding:18px 8px 12px;min-height:470px}
.fr{position:absolute;background:#fff;border:1px solid var(--ink);padding:6px;box-shadow:9px 9px 0 rgba(19,18,17,.1)}
.fr img{width:100%;height:auto}
.fr .no{position:absolute;top:-13px;left:10px;background:var(--paper);border:1px solid var(--ink);font-size:10.5px;letter-spacing:.14em;padding:1px 7px}
.f1{left:4%;top:6px;width:41%;transform:rotate(-3deg);z-index:2}
.f2{left:37%;top:52px;width:34%;transform:rotate(2.4deg);z-index:3}
.f3{right:1%;top:118px;width:33%;transform:rotate(-1.6deg);z-index:1}
.mark{position:absolute;left:2%;bottom:-6px;font-size:11px;letter-spacing:.26em;color:var(--ink-3)}

/* 标签带 */
.tags{border-bottom:1px solid var(--line);background:var(--paper-2)}
.tags-in{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding:13px 0;font-size:12.4px;letter-spacing:.14em;color:var(--ink-2)}
.tags-in i{color:var(--ink-3);font-style:normal}

/* section base */
.sec{padding:76px 0}
.hd2{display:flex;gap:26px;align-items:flex-start;margin-bottom:38px}
.hd2 .no{font-size:11px;letter-spacing:.2em;color:var(--accent);padding-top:10px;white-space:nowrap}
.hd2 h2{font-family:"Songti SC","STSong",serif;font-size:clamp(28px,3.5vw,38px);letter-spacing:-.01em;line-height:1.2}
.hd2 p{font-size:14.8px;color:var(--ink-3);margin-top:8px}

/* 特色 */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--ink);border-left:1px solid var(--line)}
.card{border-right:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 24px 24px}
.card .n{display:block;font-family:"Songti SC",serif;font-size:13px;color:var(--accent);letter-spacing:.16em;margin-bottom:12px}
.card h4{font-size:19px;letter-spacing:.02em;margin-bottom:8px}
.card p{font-size:14.2px;color:var(--ink-2)}

/* 界面 */
.band{background:var(--paper-2)}
.gallery{display:grid;grid-template-columns:1.02fr .98fr;gap:22px;align-items:start}
.gallery .big,.thumbs figure{background:#fff;border:1px solid var(--line);padding:8px}
.gallery img{width:100%;height:auto}
.gallery figcaption{font-size:12.4px;color:var(--ink-3);letter-spacing:.1em;text-align:center;padding:8px 0 2px}
.thumbs{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.thumbs figure:nth-child(3){grid-column:1 / -1}
.thumbs figure:nth-child(3) img{max-height:260px;object-fit:cover;object-position:top}
.notes{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:32px;border-top:1px solid var(--line);padding-top:24px}
.note b{display:block;font-size:15px;margin-bottom:6px}
.note p{font-size:13.8px;color:var(--ink-2)}

/* 指南 */
.dark{background:var(--dark);color:var(--paper)}
.dark .hd2 h2{color:var(--paper)}
.dark .hd2 p{color:rgba(245,242,234,.56)}
.dark .hd2 .no{color:#FF6A3D}
.steps{display:grid;grid-template-columns:1fr 1fr;gap:0 46px;border-top:1px solid rgba(245,242,234,.18)}
.steps li{display:flex;gap:18px;padding:20px 0;border-bottom:1px solid rgba(245,242,234,.18)}
.steps b{font-family:"Songti SC",serif;font-size:15px;color:#FF6A3D;letter-spacing:.1em;min-width:26px}
.steps span{font-size:14.8px;color:rgba(245,242,234,.82)}
.gnote{margin-top:22px;font-size:13.4px;color:rgba(245,242,234,.5)}

/* FAQ */
.qa{border-top:1px solid var(--ink)}
.qa-item{display:flex;gap:24px;padding:22px 0;border-bottom:1px solid var(--line)}
.qn{font-family:"Songti SC",serif;font-size:13px;color:var(--accent);letter-spacing:.14em;min-width:26px;padding-top:4px}
.qa-item h3{font-size:17.4px;margin-bottom:6px;letter-spacing:.01em}
.qa-item p{font-size:14.2px;color:var(--ink-2)}

/* 评价 */
.rev-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.rev-card{background:var(--paper);border:1px solid var(--line);border-top:3px solid var(--ink);padding:24px 22px}
.rev-card blockquote{font-family:"Songti SC","STSong",serif;font-size:16.4px;line-height:1.8;color:var(--ink)}
.who{display:flex;align-items:center;gap:8px;margin-top:18px;font-size:12.2px;color:var(--ink-3)}
.who i{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;background:var(--ink);color:var(--paper);font-style:normal;font-size:11px;border-radius:50%}

/* 下载 */
.get{background:var(--ink);color:var(--paper);padding:72px 0}
.get-in{text-align:center;max-width:760px}
.dlogo{display:flex;flex-direction:column;align-items:center;gap:8px}
.dlogo img{border-radius:8px}
.dlogo em{font-style:normal;font-size:10.5px;letter-spacing:.3em;color:rgba(245,242,234,.5)}
.get h2{font-family:"Songti SC",serif;font-size:clamp(26px,3.4vw,36px);margin:16px 0 12px}
.get h2 em{font-style:normal;color:#FF6A3D}
.get p{font-size:14.6px;color:rgba(245,242,234,.7);max-width:640px;margin:0 auto}
.dm{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:20px 0 26px}
.dm span{font-size:12px;letter-spacing:.1em;border:1px solid rgba(245,242,234,.26);padding:5px 12px;border-radius:999px;color:rgba(245,242,234,.72)}

/* footer */
.ft{background:var(--paper-2);border-top:1px solid var(--line);padding:44px 0 40px}
.ft-in{display:grid;grid-template-columns:1.4fr 1fr .9fr;gap:34px;align-items:start}
.ft-brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:15px}
.ft p{grid-column:1 / -1;font-size:12.8px;color:var(--ink-3);max-width:760px;margin-top:-14px}
.ft-links{display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--ink-2)}
.ft-links a:hover{color:var(--accent)}
.ft-copy{font-size:12.2px;color:var(--ink-3);line-height:1.9;text-align:right}

/* backtop */
.backtop{
  position:fixed;right:22px;bottom:84px;z-index:60;width:42px;height:42px;border-radius:50%;
  background:var(--ink);color:var(--paper);border:0;display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;transition:opacity .2s ease,transform .2s ease;cursor:pointer;
}
.backtop.on{opacity:1;pointer-events:auto}
.backtop:hover{transform:translateY(-2px)}

@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:40px}
  .frames{min-height:420px}
  .feat-grid{grid-template-columns:1fr 1fr}
  .gallery{grid-template-columns:1fr}
  .notes{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr}
  .rev-grid{grid-template-columns:1fr}
  .ft-in{grid-template-columns:1fr 1fr}
  .ft-copy{text-align:left}
  .nav{display:none}
  .nav-toggle{display:block}
  .nav.open{
    display:flex;position:absolute;left:0;right:0;top:66px;background:var(--paper);
    border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:8px 4%;
  }
  .nav.open a{padding:12px 0;border-bottom:1px solid var(--line)}
}
@media (max-width:600px){
  .sec{padding:56px 0}
  .hd2{flex-direction:column;gap:10px}
  .hd2 .no{padding-top:0}
  .feat-grid{grid-template-columns:1fr}
  .notes{grid-template-columns:1fr}
  .thumbs{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:1fr 1fr}
  .frames{min-height:380px}
  .f1{width:46%}.f2{width:38%;left:40%}.f3{width:36%}
  .ft-in{grid-template-columns:1fr}
  .cta{display:none}
}
.mini img{height:190px;object-fit:cover;object-position:top center}