:root{
  --brand:#f26522;--brand-d:#d24f12;--brand-l:#fff2e9;
  --ink:#1a1a1d;--ink2:#4f4d4a;--ink3:#827f7b;
  --bg:#fff;--bg2:#faf8f5;--line:#eeebe6;--wrap:1140px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
button{font:inherit;background:none;border:0;cursor:pointer;color:inherit}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 22px}

/* ---------- header ---------- */
.sh{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.86);backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid transparent;transition:border-color .2s}
.sh.on{border-bottom-color:var(--line)}
.sh-in{display:flex;align-items:center;gap:26px;height:66px}
.sh-brand{display:flex;align-items:center;gap:10px;flex:none}
.sh-brand img{width:38px;height:38px;border-radius:11px;object-fit:cover}
.sh-brand strong{display:block;font-size:16px;letter-spacing:.2px;line-height:1.2}
.sh-brand small{display:block;font-size:11px;color:var(--ink3);letter-spacing:.4px}
.sh nav{display:flex;gap:24px;margin-left:auto;font-size:14px;color:var(--ink2)}
.sh nav a{position:relative;padding:6px 0}
.sh nav a:hover{color:var(--brand)}
.sh nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--brand);
  transform:scaleX(0);transform-origin:left;transition:transform .2s}
.sh nav a:hover::after{transform:scaleX(1)}
.sh-cta{flex:none;display:inline-flex;align-items:center;gap:6px;height:38px;padding:0 18px;border-radius:19px;
  background:var(--brand);color:#fff;font-size:14px;font-weight:600;transition:.2s}
.sh-cta:hover{background:var(--brand-d)}
.sh-menu{display:none;margin-left:auto;width:38px;height:38px;border-radius:10px;border:1px solid var(--line);
  align-items:center;justify-content:center}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:52px;padding:0 30px;border-radius:26px;
  background:var(--brand);color:#fff;font-size:16px;font-weight:600;letter-spacing:.3px;
  box-shadow:0 12px 26px -12px rgba(0,0,0,.45);transition:transform .18s,background .18s}
.btn:hover{background:var(--brand-d);transform:translateY(-1px)}
.btn svg{width:18px;height:18px}
.btn-light{background:#fff;color:var(--ink);box-shadow:none}
.btn-light:hover{background:#f1f2f5}
.ghost{display:inline-flex;align-items:center;justify-content:center;height:52px;padding:0 24px;border-radius:26px;
  border:1px solid var(--line);background:#fff;color:var(--ink2);font-size:15px;font-weight:600;transition:.18s}
.ghost:hover{border-color:var(--brand);color:var(--brand)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:70px 0 78px}
.hero-in{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:1.6px;color:var(--brand);
  text-transform:uppercase;font-weight:700}
.kicker i{width:22px;height:2px;background:var(--brand);display:inline-block}
.hero h1{font-size:56px;line-height:1.06;letter-spacing:-1.2px;margin:16px 0 14px;font-weight:800}
.hero .lead{font-size:21px;font-weight:600;color:var(--ink);margin-bottom:12px}
.hero .desc{font-size:15px;color:var(--ink2);max-width:520px;line-height:1.85}
.acts{display:flex;align-items:center;gap:14px;margin:26px 0 20px;flex-wrap:wrap}
.upd{font-size:12.5px;color:var(--ink3)}
/* hero 设备 */
.hero--device{background:linear-gradient(160deg,#fff6ef,#fff 58%)}
.art-device{position:relative;height:520px;display:flex;justify-content:center;align-items:center}
.art-device::before{content:"";position:absolute;width:330px;height:330px;border-radius:50%;
  background:radial-gradient(closest-side,rgba(242,101,34,.18),transparent 70%);filter:blur(6px)}
.art-device .device{position:relative;width:258px;height:512px;border-radius:30px;overflow:hidden;border:8px solid #23262b;
  background:#1b1e24;box-shadow:0 30px 55px -24px rgba(18,20,26,.55)}
.art-device .device img{width:100%;height:100%;object-fit:cover;border-radius:22px}
.chip{position:absolute;background:#fff;border:1px solid var(--line);border-radius:8px;padding:9px 13px;
  font-size:12.5px;color:var(--ink2);box-shadow:0 14px 26px -18px rgba(18,20,26,.4)}
.chip b{display:block;font-size:13px;color:var(--ink);margin-bottom:1px}
.chip.a{left:2%;top:88px}
.chip.b{right:0;bottom:110px}

/* ---------- 进度条带 ---------- */
.progress{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.progress-in{display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.pg{padding:18px 24px;border-left:1px solid var(--line)}
.pg:first-child{border-left:0;padding-left:0}
.pg b{display:block;font-size:13px;margin-bottom:6px}
.pg .track{display:block;height:6px;border-radius:3px;background:var(--brand-l);overflow:hidden}
.pg .track i{display:block;height:100%;background:var(--brand);border-radius:3px}
.pg em{display:block;font-style:normal;font-size:11.5px;color:var(--ink3);margin-top:6px}

/* ---------- section 公共 ---------- */
section{position:relative}
.sec-h{max-width:660px;margin-bottom:40px}
.sec-k{font-size:12px;letter-spacing:2px;font-weight:700;color:var(--brand);text-transform:uppercase}
.sec-h h2{font-size:38px;line-height:1.2;letter-spacing:-.6px;margin:10px 0 12px;font-weight:800}
.sec-h p{font-size:15px;color:var(--ink2)}

/* ---------- 特色（编号行卡） ---------- */
.caps{padding:86px 0 76px}
.cap-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 56px}
.cap{display:flex;gap:18px;padding:22px 0;border-top:1px solid var(--line)}
.cap:last-child,.cap:nth-last-child(2){border-bottom:1px solid var(--line)}
.cap-no{display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;
  background:var(--brand-l);color:var(--brand);font-size:13px;font-weight:800;letter-spacing:.5px;flex:none;margin-top:2px}
.cap h4{font-size:19px;margin-bottom:5px;font-weight:700}
.cap p{font-size:14.5px;color:var(--ink2)}

/* ---------- 界面展示 ---------- */
.preview{padding:80px 0;background:var(--bg2)}
.prev-main{display:grid;grid-template-columns:1.02fr .98fr;gap:46px;align-items:center}
.prev-big{border-radius:22px;overflow:hidden;background:#fff;border:1px solid var(--line);
  box-shadow:0 30px 60px -34px rgba(18,20,26,.45)}
.prev-big img{width:100%;height:430px;object-fit:cover;object-position:top}
.prev-big figcaption{font-size:12.5px;color:var(--ink3);padding:11px 16px;border-top:1px solid var(--line);background:#fff}
.ticks{display:grid;gap:12px}
.ticks li{position:relative;padding-left:26px;font-size:14.5px;color:var(--ink2)}
.ticks li::before{content:"";position:absolute;left:0;top:6px;width:14px;height:14px;border-radius:50%;
  background:var(--brand-l);border:1px solid var(--brand)}
.ticks li::after{content:"";position:absolute;left:4px;top:9px;width:6px;height:3px;border-left:1.6px solid var(--brand);
  border-bottom:1.6px solid var(--brand);transform:rotate(-45deg)}
.prev-strip{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:26px}
.prev-strip figure{border-radius:18px;overflow:hidden;background:#fff;border:1px solid var(--line)}
.prev-strip img{width:100%;height:250px;object-fit:cover;object-position:top}
.prev-strip figcaption{font-size:12.5px;color:var(--ink3);padding:10px 14px}

/* ---------- 使用指南 ---------- */
.guide{padding:86px 0;background:var(--bg2)}
.gbox{background:#fff;border:1px solid var(--line);border-radius:22px;padding:32px 34px;
  box-shadow:0 26px 50px -38px rgba(18,20,26,.4)}
.gbox ol{counter-reset:g;display:grid;grid-template-columns:1fr 1fr;gap:16px 36px}
.gbox li{counter-increment:g;position:relative;padding-left:36px;font-size:14.5px;color:var(--ink2)}
.gbox li::before{content:counter(g);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:8px;
  background:var(--brand-l);color:var(--brand);font-size:12px;font-weight:800;
  display:flex;align-items:center;justify-content:center}
.gnote{margin-top:22px;padding:10px 0 10px 14px;border-left:3px solid var(--brand);
  font-size:13.5px;color:var(--ink3)}

/* ---------- FAQ ---------- */
.qa{padding:88px 0 80px}
.qa-in{display:grid;grid-template-columns:.78fr 1.22fr;gap:56px;align-items:start}
.qa-list{display:grid}
.qrow{padding:20px 0;border-top:1px solid var(--line)}
.qrow:last-child{border-bottom:1px solid var(--line)}
.qrow h3{font-size:17px;font-weight:700;margin-bottom:8px}
.qrow p{font-size:14px;color:var(--ink2)}

/* ---------- 评价 ---------- */
.voices{padding:80px 0;background:var(--bg2)}
.voice-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.voice{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px}
.voice p{flex:1;font-size:14.5px;color:var(--ink2)}
.voice footer{display:flex;align-items:center;gap:9px;margin-top:16px;font-size:12.5px;color:var(--ink3)}
.voice footer i{width:26px;height:26px;border-radius:50%;background:var(--brand-l);color:var(--brand);
  font-style:normal;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
.voice footer time{margin-left:auto;font-size:12px;color:var(--ink3);font-variant-numeric:tabular-nums}
.voice footer cite{font-style:normal}

/* ---------- 下载 ---------- */
.get{background:#1d1b19;color:#fff;padding:72px 0}
.get-in{display:flex;align-items:center;justify-content:space-between;gap:36px;flex-wrap:wrap}
.get h2{font-size:34px;letter-spacing:-.5px;margin-bottom:8px;font-weight:800}
.get p{font-size:14.5px;color:rgba(255,255,255,.66);max-width:560px}

/* ---------- footer ---------- */
.ft{border-top:1px solid var(--line);padding:40px 0 34px}
.ft-in{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:flex-start}
.ft-brand{display:flex;align-items:center;gap:10px}
.ft-brand img{width:32px;height:32px;border-radius:9px;object-fit:cover}
.ft-brand strong{font-size:15px}
.ft p{font-size:12.5px;color:var(--ink3);max-width:420px;margin-top:10px}
.ft-links{display:flex;gap:18px;font-size:13px;color:var(--ink3);flex-wrap:wrap}
.ft-links a:hover{color:var(--brand)}
.ft-copy{font-size:12px;color:var(--ink3);margin-top:22px;border-top:1px solid var(--line);padding-top:16px}

/* ---------- backtop ---------- */
.backtop{position:fixed;right:24px;bottom:84px;z-index:50;width:42px;height:42px;border-radius:50%;
  display:none;align-items:center;justify-content:center;background:#fff;border:1px solid var(--line);
  color:var(--ink);box-shadow:0 12px 26px -14px rgba(18,20,26,.55)}
.backtop.on{display:flex}
.backtop:hover{color:var(--brand);border-color:var(--brand)}

/* 入场：加载即播，无 JS 也可见 */
.rv{animation:rvIn .5s ease both}
@keyframes rvIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){.rv{animation:none}}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .hero h1{font-size:42px}
  .hero-in,.prev-main,.qa-in{grid-template-columns:1fr;gap:34px}
  .art-device{height:430px;transform:scale(.92)}
  .progress-in{grid-template-columns:1fr}
  .pg{border-left:0;border-top:1px solid var(--line);padding:14px 0}
  .pg:first-child{border-top:0}
  .cap-grid,.prev-strip{grid-template-columns:1fr}
  .cap:last-child{border-bottom:0}
  .voice-grid{grid-template-columns:1fr}
  .gbox ol{grid-template-columns:1fr}
  .sec-h h2{font-size:30px}
  .sh nav{display:none}
  .sh-menu{display:inline-flex}
  .sh-cta{margin-left:10px}
  .sh nav.open{display:flex;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;
    padding:14px 22px 18px;gap:14px;border-bottom:1px solid var(--line)}
  .backtop{right:16px;bottom:76px}
}
@media(max-width:560px){
  .hero{padding:44px 0 54px}
  .hero h1{font-size:34px}
  .hero .lead{font-size:18px}
  .device{width:200px;height:400px}
  .chip.a,.chip.b{display:none}
  .get h2{font-size:26px}
  .btn,.ghost{width:100%}
  .gbox{padding:24px 20px}
  .voice{padding:20px}
}