/* 伴居宝 APP 官网 — 白底、蓝色点缀；布局：1160px 容器，图文交替分段，手机单列 */
:root{
  --brand:#1355F5; --brand-dark:#0E45C9; --brand-soft:#EEF3FF; --brand-soft-2:#E3ECFF; --teal:#17C8B8;
  --bg:#FFFFFF; --bg-soft:#F6F8FB; --ink:#17191F; --ink-2:#3C4252; --muted:#6B7280; --line:#ECEFF4;
  --shadow:0 12px 40px -16px rgba(17,25,51,.18);
  --r:20px; --r-s:14px;
  --font:"PingFang SC","HarmonyOS Sans SC","MiSans","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color-scheme:light;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.7;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0;line-height:1.25;text-wrap:balance;letter-spacing:-.01em;font-weight:600}
p{margin:0;text-wrap:pretty}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px}

.wrap{width:min(1160px,100% - 48px);margin-inline:auto}
@media (max-width:640px){.wrap{width:min(1160px,100% - 40px)}}

.eyebrow{display:inline-block;font-size:13px;font-weight:600;color:var(--brand);letter-spacing:.04em}
.h2{font-size:clamp(26px,3.6vw,38px);margin-top:0}
.lead{color:var(--muted);font-size:clamp(15px,1.4vw,17px);max-width:56ch;margin-top:14px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 24px;border-radius:999px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;transition:transform .2s,background .2s,border-color .2s;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-dark{background:var(--ink);color:#fff}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:#CFD6E2}
.btn-soft{background:var(--brand-soft);color:var(--brand)}
.btn svg{width:18px;height:18px;flex:none}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);-webkit-backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:border-color .2s}
.nav.scrolled{border-bottom-color:var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;font-size:17px}
.brand .brand-lockup{height:38px;width:auto;display:block}
.nav-links{display:flex;gap:2px;list-style:none;margin:0;padding:0}
.nav-links a{padding:8px 14px;border-radius:999px;font-weight:500;font-size:15px;color:var(--ink-2);transition:color .2s,background .2s}
.nav-links a:hover{color:var(--brand);background:var(--brand-soft)}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-cta .btn{height:40px;padding:0 18px;font-size:14px}
.burger{display:none;width:44px;height:44px;border:0;background:transparent;border-radius:12px;cursor:pointer;color:var(--ink)}
.burger span{display:block;width:20px;height:2px;background:currentColor;margin:5px auto;border-radius:2px;transition:transform .25s,opacity .25s}
.drawer{display:none}
@media (max-width:900px){
  .nav-links,.nav-cta .btn-ghost{display:none}
  .burger{display:block}
  .drawer{display:block;position:fixed;top:68px;left:0;right:0;z-index:49;background:#fff;border-bottom:1px solid var(--line);padding:8px 20px 16px;transform:translateY(-110%);transition:transform .3s cubic-bezier(.2,.8,.2,1);box-shadow:var(--shadow)}
  .drawer.open{transform:translateY(0)}
  .drawer a{display:block;padding:14px 4px;font-size:16px;font-weight:500;border-bottom:1px solid var(--line)}
  .drawer a:last-child{border:0;color:var(--brand)}
  .burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .burger.open span:nth-child(2){opacity:0}
  .burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
}

/* 首屏 */
.hero{position:relative;padding-block:56px 48px;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(44px,6.4vw,72px);font-weight:700;letter-spacing:-.02em;margin-top:0;color:var(--brand)}
.hero-sub{font-size:clamp(20px,2.4vw,28px);font-weight:600;color:var(--ink);margin-top:10px;letter-spacing:-.01em}
.hero .lead{font-size:clamp(16px,1.6vw,18px);margin-top:18px}
.download{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:30px}
.btn-lg{height:54px;padding:0 30px;font-size:16px}
.download-note{color:var(--muted);font-size:13px}
.stats{display:flex;flex-wrap:wrap;gap:28px 40px;margin-top:36px;padding-top:24px;border-top:1px solid var(--line)}
.stat b{display:block;font-size:26px;font-weight:700;letter-spacing:-.02em;font-variant-numeric:tabular-nums;line-height:1.1}
.stat b small{font-size:.55em;font-weight:600;margin-left:1px}
.stat span{display:block;color:var(--muted);font-size:13px;margin-top:2px;white-space:nowrap}
.hero-visual{position:relative;display:flex;justify-content:center;align-items:flex-end;gap:0;min-height:420px}
.hero-visual::before{content:"";position:absolute;top:8%;left:6%;right:6%;bottom:0;border-radius:32px;background:linear-gradient(180deg,var(--brand-soft) 0%,#fff 100%);z-index:0}
.phone{position:relative;z-index:1;border-radius:34px;background:#fff;padding:8px;border:1px solid var(--line);box-shadow:var(--shadow)}
.phone .inner{border-radius:27px;overflow:hidden;aspect-ratio:780/1688;background:var(--bg-soft)}
.phone img{width:100%;height:100%;object-fit:cover;object-position:top}
.hero-visual .phone{width:46%;max-width:300px}
.hero-visual .phone.back{width:40%;max-width:260px;margin-right:-6%;margin-bottom:40px;transform:rotate(-4deg);z-index:0;opacity:.95}
.hero-visual .phone.front{transform:translateY(10px)}
.chip{position:absolute;z-index:2;display:flex;align-items:center;gap:10px;background:#fff;color:var(--ink);padding:10px 14px;border-radius:14px;box-shadow:var(--shadow);border:1px solid var(--line);font-size:13px;font-weight:600;animation:float 6s ease-in-out infinite}
.chip i{display:grid;place-items:center;width:28px;height:28px;border-radius:9px;background:var(--brand-soft);color:var(--brand);flex:none}
.chip i.ok{background:#E6F8F2;color:#12A37D}
.chip i svg{width:15px;height:15px}
.chip small{display:block;color:var(--muted);font-weight:500;font-size:12px}
.chip.c1{left:0;top:18%}
.chip.c2{right:0;bottom:22%;animation-delay:-3s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@media (max-width:900px){
  .hero{padding-block:32px 36px}
  .hero .wrap{grid-template-columns:1fr;gap:36px}
  .hero-visual{min-height:0;margin-top:8px}
  .hero-visual .phone{width:52%}
  .hero-visual .phone.back{width:44%}
  .stats{gap:18px 24px}
  .stat b{font-size:22px}
}
@media (max-width:480px){.download .btn-lg{width:100%}.chip small{display:none}}

/* 分区通用 */
.section{padding-block:clamp(56px,8vw,96px)}
.section.soft{background:var(--bg-soft)}
.section-head{max-width:680px}
.section-head.center{margin-inline:auto;text-align:center}
.section-head.center .lead{margin-inline:auto}

/* 三栏功能 */
.feat3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.feat{text-align:center;padding:28px 24px 30px;border-radius:24px;background:var(--bg-soft)}
.feat .phone{width:min(70%,230px);margin:0 auto 22px}
.feat h3{font-size:18px}
.feat p{color:var(--muted);font-size:14px;margin:8px auto 0;max-width:30ch}
.more{text-align:center;color:var(--muted);font-size:14px;margin-top:28px}
@media (max-width:900px){
  .feat3{display:flex;gap:14px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px 4px 12px;margin:32px -4px 0;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .feat3::-webkit-scrollbar{display:none}
  .feat{flex:0 0 78%;scroll-snap-align:center;padding:22px 18px 24px}
  .feat .phone{width:min(62%,200px)}
}

/* 门禁机 */
.device{display:grid;grid-template-columns:5fr 6fr;gap:40px;align-items:center;margin-top:44px}
.device-img{margin:0;border-radius:24px;overflow:hidden;background:linear-gradient(170deg,#FFFFFF 0%,#EAF0FF 100%);border:1px solid var(--line);aspect-ratio:1/1}
.device-img img{width:100%;height:100%;object-fit:cover;object-position:center 46%;transform:scale(1.15);transform-origin:center 48%}
.device-points{display:grid;gap:10px}
.device-points>div{padding:16px 20px;border-radius:var(--r-s);background:#fff;border:1px solid var(--line)}
.device-points b{display:block;font-size:16px;font-weight:600}
.device-points p{color:var(--muted);font-size:14px;margin-top:4px}
.screens{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:20px}
.screen{margin:0}
.screen img{width:100%;aspect-ratio:1170/2000;object-fit:cover;border-radius:16px;border:1px solid var(--line)}
.screen figcaption{text-align:center;color:var(--muted);font-size:13px;padding-top:10px}
@media (max-width:900px){
  .device{grid-template-columns:1fr;gap:16px;margin-top:28px}
  .device-img{aspect-ratio:4/3}
  .device-img img{transform:scale(1.1)}
  .screens{display:flex;gap:12px;overflow-x:auto;scroll-snap-type:x mandatory;padding:4px 4px 8px;margin:16px -4px 0;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .screens::-webkit-scrollbar{display:none}
  .screen{flex:0 0 44%;scroll-snap-align:center}
}
/* 关于 */
.about-simple{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.mission{display:inline-block;margin-top:18px;padding:10px 18px;border-radius:999px;background:var(--brand-soft);color:var(--brand);font-weight:600;font-size:15px;letter-spacing:.04em}
.facts{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.facts>div{padding:20px 18px;border-radius:var(--r);background:var(--bg-soft);display:grid;gap:4px}
.facts i{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:#fff;color:var(--brand);margin-bottom:8px}
.facts i svg{width:19px;height:19px}
.facts b{font-size:28px;font-weight:700;letter-spacing:-.02em;line-height:1;font-variant-numeric:tabular-nums}
.facts b small{font-size:.5em;font-weight:600;margin-left:2px}
.facts span{color:var(--muted);font-size:13px}
.h3{font-size:clamp(20px,2.4vw,26px);margin-top:clamp(48px,6vw,72px);text-align:center}
.biz{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:24px}
.biz>div{padding:24px 20px;border-radius:var(--r);background:#fff;border:1px solid var(--line);text-align:center;transition:transform .2s,box-shadow .2s}
.biz>div:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.biz i{display:grid;place-items:center;width:48px;height:48px;border-radius:14px;background:var(--brand-soft);color:var(--brand);margin:0 auto 14px}
.biz i svg{width:23px;height:23px}
.biz b{display:block;font-size:16px;font-weight:600}
.biz p{color:var(--muted);font-size:13px;margin-top:4px}
.timeline{display:grid;grid-template-columns:repeat(5,1fr);margin-top:32px;position:relative}
.timeline::before{content:"";position:absolute;left:0;right:0;top:7px;height:2px;background:var(--line)}
.tl{position:relative;padding:0 20px 0 0}
.tl::before{content:"";display:block;width:16px;height:16px;border-radius:50%;background:#fff;border:3px solid var(--brand);box-sizing:border-box;position:relative;z-index:1}
.tl b{display:block;font-size:18px;font-weight:700;margin-top:14px;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.tl strong{display:block;font-size:15px;font-weight:600;margin-top:2px}
.tl p{color:var(--muted);font-size:13px;margin-top:4px}
@media (max-width:900px){
  .about-simple{grid-template-columns:1fr;gap:24px}
  .biz{grid-template-columns:1fr 1fr;gap:10px}
  .biz>div{padding:18px 14px}
  .timeline{grid-template-columns:1fr;padding-left:0}
  .timeline::before{left:7px;right:auto;top:0;bottom:0;width:2px;height:auto}
  .tl{display:grid;grid-template-columns:16px 1fr;column-gap:16px;padding:0 0 22px}
  .tl::before{grid-row:1/4}
  .tl b{margin-top:0;grid-column:2}
  .tl strong,.tl p{grid-column:2}
}

/* 下载 CTA */
.cta{padding-block:clamp(48px,7vw,80px)}
.cta-card{border-radius:28px;background:var(--brand-soft);padding:clamp(28px,5vw,56px);text-align:center}
.cta-card .lead{margin-inline:auto}
.cta-card .download{justify-content:center}
.cta-card h2{font-size:clamp(26px,3.4vw,36px)}
.cta-card .lead{margin-top:10px}
.cta-card .download{margin-top:24px}
@media (max-width:900px){.cta-card{grid-template-columns:1fr;border-radius:22px}}

/* 页脚 */
.footer{border-top:1px solid var(--line);padding:40px 0 calc(28px + env(safe-area-inset-bottom,0px));color:var(--muted);font-size:13px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.footer .brand .brand-lockup{height:34px}
.footer-co{margin-top:14px;line-height:1.8}
.nowrap{white-space:nowrap}
.br-m{display:none}
@media (max-width:480px){.br-m{display:inline}}
.footer h4{margin:0 0 12px;font-size:14px;color:var(--ink);font-weight:600}
.footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.footer li b{color:var(--ink);font-weight:500;user-select:all}
.footer .copy{margin-left:8px;background:#fff;border:1px solid var(--line);color:var(--brand);border-radius:999px;padding:2px 10px;font-size:12px;cursor:pointer}
.footer-bottom{margin-top:32px;padding-top:20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between}
.footer-bottom a{color:var(--muted)}
@media (max-width:900px){.footer-grid{grid-template-columns:1fr;gap:24px}}

/* 进场 */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .4s ease-out,transform .4s ease-out}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .chip,.btn,.tile{animation:none;transition:none}
}

/* 旧内核回退（微信 X5 / iOS 14 以下） */
@supports not (aspect-ratio:1/1){
  .phone .inner{position:relative;height:0;padding-bottom:216.4%}
  .phone .inner img{position:absolute;inset:0;top:0;left:0;width:100%;height:100%}
  .device-img{position:relative;height:0;padding-bottom:100%}
  .device-img img{position:absolute;top:0;left:0;width:100%;height:100%}
  .screen{position:relative}
  .screen img{height:auto}
  @media (max-width:900px){.device-img{padding-bottom:75%}}
}
@supports not (inset:0){
  .stats .stat{margin:0 40px 28px 0}
  .nav-links a{margin-right:2px}
  .btn svg{margin-right:8px}
  .chip i{margin-right:10px}
  .nav-cta .btn-primary{margin-left:10px}
}