:root{
  --bg:#0B0B0C;
  --bg-soft:#17171A;
  --ink:#F4F4F6;
  --ink-2:rgba(244,244,246,.66);
  --gray:rgba(244,244,246,.44);
  --gray-2:rgba(244,244,246,.28);
  --pad:26px;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

/* 供微信抓取的分享缩略图，挪出可视区域但不隐藏（隐藏后抓不到） */
.wxshare{
  position:fixed;left:-9999px;top:0;
  width:300px;height:300px;
  pointer-events:none;
}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overscroll-behavior-y:none;
}
button{font-family:inherit;border:0;background:none;padding:0;color:inherit;cursor:pointer}
a{color:inherit;text-decoration:none}
h1,h2,h3,p,dl,dd,dt,ul,li,figure{margin:0;padding:0}
ul,ol{list-style:none}
img{display:block;max-width:100%}

.app{
  max-width:480px;margin:0 auto;background:var(--bg);
  position:relative;overflow:hidden;
}

/* ---------- 顶部 ---------- */
.top{
  display:flex;align-items:center;justify-content:space-between;
  padding:20px var(--pad) 0;
}
.logo{height:17px;width:auto}
.logo-blue{display:none}
.topcall{
  font-size:11px;color:var(--gray);letter-spacing:.06em;
  font-variant-numeric:tabular-nums;
}

/* ---------- 页面切换：三页互不串 ---------- */
.page{display:none;padding-bottom:calc(56px + env(safe-area-inset-bottom))}
.page.on{display:block}

.sec-about h2,
.sec-serv h2,
.sec-cases h2,
.sec-contact h2,
.dinfo h2{
  font-size:25px;font-weight:600;line-height:1.45;letter-spacing:-.04em;
}

/* ---------- 首屏 ---------- */
.sec-intro{padding:34px var(--pad) 0}
.sec-intro h1{
  font-size:34px;font-weight:600;line-height:1.34;letter-spacing:-.045em;
}
.lead{
  margin-top:16px;max-width:29em;
  font-size:12.5px;line-height:1.95;color:var(--ink-2);
  text-wrap:pretty;
}

/* 两张公司照片 */
.shots{
  display:grid;grid-template-columns:1fr 1fr;gap:6px;
  margin-top:26px;
}
.shots figure{
  margin:0;overflow:hidden;background:var(--bg-soft);
}
.shots img{width:100%;height:100%;object-fit:cover}

/* ---------- 关于 ---------- */
.sec-about{padding:64px var(--pad) 0}
.about-lead{
  margin-top:18px;max-width:27em;
  font-size:12.5px;line-height:1.95;color:var(--ink-2);
  text-wrap:pretty;
}
.about-std{
  margin-top:20px;max-width:27em;
  font-size:13px;line-height:1.9;color:var(--ink);
  letter-spacing:-.005em;
}

/* ---------- 服务 ---------- */
.sec-serv{padding:64px var(--pad) 60px}
.serv{margin-top:20px}
.serv a{
  display:flex;align-items:center;justify-content:space-between;
  gap:10px;padding:12px 0;
  font-size:14px;letter-spacing:-.005em;color:var(--ink);
  transition:opacity .2s ease;
}
.serv a:active{opacity:.5}
.serv svg{flex:none;color:var(--gray-2)}

/* ---------- 案例 ---------- */
.sec-cases{padding:30px var(--pad) 56px}
.chead{display:flex;align-items:center;justify-content:space-between;position:relative}
.cnow{
  margin-left:9px;font-size:11px;font-weight:400;
  letter-spacing:.02em;color:var(--gray-2);
}
.cwrap{position:relative;flex:none}

/* 三横线按钮 */
.nav3{
  display:flex;flex-direction:column;align-items:flex-end;justify-content:center;
  gap:4px;width:32px;height:32px;padding:8px 0 8px 12px;
  margin-right:-4px;color:rgba(244,244,246,.62);
  transition:color .2s ease;
}
.nav3 span{
  display:block;width:17px;height:1.5px;background:currentColor;
  transition:transform .22s cubic-bezier(.22,.72,.2,1),opacity .16s ease;
}
.nav3:active,.nav3[aria-expanded="true"]{color:var(--ink)}
.nav3[aria-expanded="true"] span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav3[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav3[aria-expanded="true"] span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* 下拉菜单 */
.cmenu{
  position:absolute;top:calc(100% + 8px);right:-2px;z-index:45;
  min-width:136px;padding:7px 0;
  background:#1B1B1F;
  box-shadow:0 14px 38px rgba(0,0,0,.6),0 0 0 1px rgba(255,255,255,.06);
  opacity:0;visibility:hidden;transform:translateY(-6px);pointer-events:none;
  transition:opacity .18s ease,transform .18s ease,visibility 0s linear .18s;
}
.cmenu.in{
  opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto;
  transition:opacity .18s ease,transform .18s ease,visibility 0s;
}
.cmenu button{
  display:block;width:100%;text-align:left;white-space:nowrap;
  padding:10px 19px 11px;
  font-size:13px;letter-spacing:-.005em;line-height:1.45;
  color:rgba(244,244,246,.55);
  transition:color .16s ease;
}
.cmenu button.on{color:var(--ink);font-weight:500}
.cmenu button.on::after{
  content:"";display:inline-block;width:4px;height:4px;border-radius:50%;
  background:currentColor;margin-left:8px;vertical-align:2px;
}
.cmenu button:active{color:var(--ink)}

.grid{display:flex;gap:10px;margin-top:22px;align-items:flex-start}
.grid.one{display:block}
.col{flex:1;min-width:0;display:flex;flex-direction:column;gap:22px}
.card{width:100%;text-align:left}
.card .shot{
  position:relative;width:100%;overflow:hidden;background:var(--bg-soft);
}
.card .shot img{
  width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity .5s ease;
}
.card .shot img.loaded{opacity:1}
.card h3{
  font-size:12.5px;font-weight:400;line-height:1.5;margin-top:9px;
  letter-spacing:-.005em;color:var(--ink);
}
.card .meta{
  font-size:10px;color:var(--gray-2);margin-top:4px;letter-spacing:.06em;
}
.card:active .shot img{opacity:.8}

/* 图片占位 */
.ph{
  width:100%;height:100%;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-soft);
  color:rgba(244,244,246,.22);font-size:9.5px;letter-spacing:.16em;
}
.cempty{
  margin-top:60px;font-size:12px;line-height:1.9;color:var(--gray);
}

/* ---------- 联系 ---------- */
.sec-contact{
  display:flex;flex-direction:column;
  min-height:calc(100vh - 42px);
  min-height:calc(100svh - 42px);
  padding:52px var(--pad) 24px;
}
.kick{
  font-size:10px;color:var(--gray-2);letter-spacing:.2em;line-height:1.5;
}
.sec-contact h2{margin-top:16px}
.clead{
  margin-top:14px;max-width:24em;
  font-size:12.5px;line-height:1.9;color:var(--gray);
  text-wrap:pretty;
}
.tel{
  display:flex;flex-direction:column;gap:6px;
  margin-top:34px;align-self:flex-start;
}
.tel-num{
  font-size:25px;font-weight:600;letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;color:var(--ink);
}
.tel-tip{
  font-size:10px;letter-spacing:.18em;color:var(--gray-2);
}
.cinfo{margin-top:34px;display:flex;flex-direction:column;gap:16px}
.cinfo>div{display:flex;gap:16px;align-items:baseline}
.cinfo dt{
  flex:none;width:28px;font-size:10px;
  color:var(--gray-2);letter-spacing:.1em;
}
.cinfo dd{
  font-size:12.5px;color:var(--ink-2);line-height:1.7;
}
.qrrow{margin-top:34px;display:flex;gap:18px;align-items:center}
.qrrow img{width:82px;height:82px;flex:none;background:#fff}
.qrrow b{display:block;font-size:12px;font-weight:500;letter-spacing:.02em;color:var(--ink)}
.qrrow p{margin-top:6px;font-size:11px;line-height:1.8;color:var(--gray)}
.fine{
  margin-top:auto;padding-top:44px;
  font-size:9.5px;letter-spacing:.06em;color:rgba(244,244,246,.34);
}

/* ---------- 底部导航 ---------- */
.tabs{
  position:fixed;left:50%;transform:translateX(-50%);bottom:0;
  width:100%;max-width:480px;z-index:40;
  display:flex;
  background:rgba(11,11,12,.92);
  backdrop-filter:saturate(160%) blur(16px);
  -webkit-backdrop-filter:saturate(160%) blur(16px);
  padding-bottom:env(safe-area-inset-bottom);
}
.tabs a{
  flex:1;display:flex;align-items:center;justify-content:center;
  height:56px;font-size:11.5px;letter-spacing:.1em;color:var(--gray-2);
  transition:color .2s ease;
}
.tabs a.on{color:var(--ink);font-weight:500}

/* ---------- 案例详情 ---------- */
.detail{
  position:fixed;inset:0;z-index:60;background:var(--bg);
  overflow-y:auto;-webkit-overflow-scrolling:touch;
  opacity:0;transition:opacity .2s ease;
}
.detail.in{opacity:1}
.back{
  position:fixed;top:calc(14px + env(safe-area-inset-top));
  left:max(14px, calc(50% - 240px + 14px));
  width:34px;height:34px;
  background:rgba(20,20,22,.72);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  display:flex;align-items:center;justify-content:center;
  color:var(--ink);z-index:70;
}

/* 主图 */
.dhero{
  position:relative;overflow:hidden;
  background:var(--bg-soft);cursor:zoom-in;
}
.dhero img{display:block;width:100%;height:auto;max-height:82vh;object-fit:cover}
.dhero.blank{aspect-ratio:4/5;cursor:default}

.dinfo{padding:24px var(--pad) 0}
.dmeta{
  font-size:10px;color:var(--gray-2);letter-spacing:.14em;
}
.dinfo h2{margin-top:10px}
.dhigh{
  margin-top:14px;max-width:29em;
  font-size:12.5px;color:var(--ink-2);line-height:1.95;
  text-wrap:pretty;
}
.dspec{
  display:grid;grid-template-columns:1fr 1fr;
  column-gap:16px;row-gap:20px;
  margin-top:28px;
}
.dspec[hidden]{display:none}
.dspec dt{font-size:10px;color:var(--gray-2);letter-spacing:.12em}
.dspec dd{font-size:12.5px;margin-top:5px;letter-spacing:-.005em;color:var(--ink)}

/* 实景缩略网格 */
.dshots-sec{padding:30px var(--pad) 0}
.dh{font-size:10px;letter-spacing:.16em;color:var(--gray-2)}
.dh span{margin-left:7px;letter-spacing:.04em}
.dshots{
  display:grid;grid-template-columns:1fr 1fr;gap:4px;
  margin-top:12px;
}
.dshot{
  position:relative;aspect-ratio:1;overflow:hidden;
  background:var(--bg-soft);
}
.dshot img{
  width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity .45s ease;
}
.dshot img.loaded{opacity:1}
.dshot:active img{opacity:.75}

.dpad{height:calc(92px + env(safe-area-inset-bottom))}
.dbar{
  position:fixed;bottom:0;left:50%;
  width:100%;max-width:480px;z-index:65;
  padding:12px var(--pad) calc(12px + env(safe-area-inset-bottom));
  background:rgba(11,11,12,.92);
  backdrop-filter:saturate(160%) blur(16px);
  -webkit-backdrop-filter:saturate(160%) blur(16px);
  transform:translateX(-50%) translateY(100%);
  transition:transform .26s ease;
}
.dbar.in{transform:translateX(-50%) translateY(0)}
.dbtn{
  display:flex;align-items:center;justify-content:center;
  height:48px;background:var(--ink);color:#0B0B0C;
  font-size:13px;letter-spacing:.08em;
}
.dbtn:active{background:#D8D8DC}

/* ---------- 全屏看图 ---------- */
.viewer{
  position:fixed;inset:0;z-index:80;background:#000;
  opacity:0;transition:opacity .18s ease;
}
.viewer.in{opacity:1}
.vclose{
  position:absolute;top:calc(10px + env(safe-area-inset-top));right:12px;z-index:2;
  width:36px;height:36px;display:flex;align-items:center;justify-content:center;
  color:#fff;background:rgba(0,0,0,.42);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
}
.vflow{
  display:flex;height:100%;
  overflow-x:auto;overflow-y:hidden;
  scroll-snap-type:x mandatory;
  scrollbar-width:none;-webkit-overflow-scrolling:touch;
}
.vflow::-webkit-scrollbar{display:none}
.vslide{
  flex:0 0 100%;height:100%;scroll-snap-align:center;
  display:flex;align-items:center;justify-content:center;
}
.vslide img{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}
.vnum{
  position:absolute;left:50%;transform:translateX(-50%);
  bottom:calc(16px + env(safe-area-inset-bottom));
  font-size:10px;letter-spacing:.16em;color:rgba(255,255,255,.6);
  font-variant-numeric:tabular-nums;
}

@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .card .shot img{transition:none}
}

/* 小屏 */
@media(max-height:730px){
  .sec-intro{padding-top:26px}
  .sec-intro h1{font-size:31px}
  .lead{margin-top:14px;font-size:12px}
  .shots{margin-top:22px}
  .sec-about{padding-top:52px}
  .sec-serv{padding-top:52px}
}