/* wqzhu.com — binance APP官网 · 极简高级风
   纯白/极浅灰底 + 近黑文字 + 细线分隔 + 超大字号强对比 + 大面积留白
   无彩色、无圆角、无阴影 —— 质感来自克制 */
:root{
  --bg:#ffffff; --bg2:#fafafa; --bg3:#f4f4f4;
  --ink:#0a0a0a; --ink2:#4a4a4a; --ink3:#8f8f8f; --ink4:#b8b8b8;
  --line:#e8e8e8; --line2:#d5d5d5;
  --wrap:1180px; --narrow:720px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue","Microsoft YaHei",Arial,sans-serif;
  font-size:15px;line-height:1.9;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 40px;width:100%}
.narrow{max-width:var(--narrow);margin:0 auto;padding:0 40px;width:100%}

/* ============ 导航：极细，无阴影 ============ */
.nav{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px}
.lg{font-size:15px;font-weight:700;letter-spacing:-.01em;flex-shrink:0}
.lg em{font-style:normal;font-weight:400;color:var(--ink3);margin-left:8px;font-size:12px;letter-spacing:.14em}
.nmenu{display:flex;gap:34px;margin-left:auto;margin-right:34px}
.nmenu a{font-size:13.5px;color:var(--ink2);letter-spacing:.01em;transition:color .18s}
.nmenu a:hover,.nmenu a.on{color:var(--ink)}
.mbtn{display:none;width:38px;height:38px;background:none;border:1px solid var(--line2);border-radius:2px;position:relative;cursor:pointer}
.mbtn i{position:absolute;left:11px;width:16px;height:1px;background:var(--ink)}
.mbtn i:nth-child(1){top:14px}.mbtn i:nth-child(2){top:19px}.mbtn i:nth-child(3){top:24px}
.mnav{display:none;border-bottom:1px solid var(--line);background:#fff}
.mnav.open{display:block}
.mnav a{display:block;padding:16px 40px;border-bottom:1px solid var(--line);font-size:14px;color:var(--ink2)}

.btn-k{display:inline-block;background:var(--ink);color:#fff;font-size:13.5px;font-weight:600;letter-spacing:.02em;padding:11px 26px;border-radius:2px;transition:.18s}
.btn-k:hover{background:#2b2b2b}
.btn-w{display:inline-block;border:1px solid var(--line2);color:var(--ink);font-size:13.5px;font-weight:600;letter-spacing:.02em;padding:10px 26px;border-radius:2px;transition:.18s}
.btn-w:hover{border-color:var(--ink);background:var(--bg2)}

/* 小标签 */
.lab{display:block;font-size:11px;letter-spacing:.26em;text-transform:uppercase;color:var(--ink3);font-weight:500}

/* ============ Hero：超大字号 + 大留白 ============ */
.hero{padding:130px 0 120px;border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.32fr .68fr;gap:70px;align-items:end}
.hero h1{font-size:76px;line-height:1.04;font-weight:800;letter-spacing:-.045em;margin:26px 0 30px}
.hero h1 span{display:block}
.hero .sub{font-size:16px;color:var(--ink2);line-height:2;max-width:520px;margin-bottom:38px}
.hero .btns{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.hero .note{font-size:12.5px;color:var(--ink3);margin-top:30px;line-height:1.9}

/* 手机线稿 */
.phone{position:relative;width:100%;max-width:280px;margin:0 auto;aspect-ratio:9/18.6;border:1.5px solid var(--ink);border-radius:26px;padding:16px 14px;background:#fff}
.phone::after{content:"";position:absolute;left:50%;top:9px;transform:translateX(-50%);width:44px;height:4px;border-radius:3px;background:var(--ink);opacity:.85}
.phone .sc{height:100%;display:flex;flex-direction:column;gap:10px}
.phone .r1{display:flex;justify-content:space-between;align-items:baseline;padding-top:8px}
.phone .r1 b{font-size:15px;font-weight:800;letter-spacing:-.02em}
.phone .r1 i{font-style:normal;font-size:10px;color:var(--ink3);letter-spacing:.1em}
.phone .bars{display:flex;align-items:flex-end;gap:4px;height:78px;margin:8px 0}
.phone .bars i{flex:1;background:var(--ink);opacity:.14;border-radius:1px}
.phone .bars i.h{opacity:.9}
.phone .row{display:flex;justify-content:space-between;padding:9px 0;border-top:1px solid var(--line);font-size:11px}
.phone .row span{color:var(--ink3)}
.phone .row b{font-weight:600}
.phone .row em{font-style:normal;color:var(--ink2)}
.phone .cta{margin-top:auto;background:var(--ink);color:#fff;text-align:center;font-size:11.5px;padding:11px;border-radius:2px;letter-spacing:.06em}

/* ============ 数据条：细线分隔，无卡片 ============ */
.stats{border-bottom:1px solid var(--line)}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);padding:52px 40px}
.st{padding-right:24px;border-right:1px solid var(--line)}
.st:last-child{border-right:none;padding-right:0}
.st b{display:block;font-size:40px;font-weight:300;letter-spacing:-.04em;line-height:1.1;margin-bottom:6px}
.st span{font-size:12.5px;color:var(--ink3);letter-spacing:.02em}

/* ============ 通用区块 ============ */
.sec{padding:140px 0;border-bottom:1px solid var(--line)}
.sec.last{border-bottom:none}
.sec-h{margin-bottom:70px}
.sec-h h2{font-size:38px;font-weight:800;letter-spacing:-.035em;line-height:1.2;margin-top:22px;max-width:760px}
.sec-h p{font-size:15px;color:var(--ink2);max-width:560px;margin-top:20px;line-height:2}

/* 编号条目列表：无卡片，靠细线 */
.nlist{border-top:1px solid var(--line)}
.ni{display:grid;grid-template-columns:88px 1fr 1.15fr;gap:40px;padding:38px 0;border-bottom:1px solid var(--line);align-items:start;transition:.2s}
.ni:hover{background:var(--bg2)}
.ni .no{font-size:12px;font-weight:600;color:var(--ink3);letter-spacing:.14em;padding-top:5px}
.ni h3{font-size:21px;font-weight:700;letter-spacing:-.02em;line-height:1.4}
.ni p{font-size:14px;color:var(--ink2);line-height:2}

/* ============ 大留白展示区 ============ */
.feature{text-align:center;padding:150px 0}
.feature h2{font-size:52px;font-weight:800;letter-spacing:-.045em;line-height:1.12;max-width:820px;margin:24px auto 26px}
.feature p{font-size:15.5px;color:var(--ink2);max-width:560px;margin:0 auto;line-height:2.05}
.feature .phones{display:flex;gap:26px;justify-content:center;margin-top:80px;flex-wrap:wrap}
.feature .phones .phone{max-width:230px}

/* ============ 规格表 ============ */
.spec{border-top:1px solid var(--line)}
.spec .sr{display:grid;grid-template-columns:1fr 1.6fr;gap:40px;padding:26px 0;border-bottom:1px solid var(--line)}
.spec .sr dt{font-size:13.5px;color:var(--ink3);letter-spacing:.02em}
.spec .sr dd{font-size:14.5px;color:var(--ink)}

/* ============ 下载 CTA ============ */
.dl{padding:150px 0;text-align:center;border-bottom:1px solid var(--line)}
.dl h2{font-size:46px;font-weight:800;letter-spacing:-.04em;line-height:1.15;margin:24px auto 20px;max-width:720px}
.dl p{font-size:15px;color:var(--ink2);margin-bottom:44px}
.dl .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.dl .code{margin-top:56px;display:flex;flex-direction:column;align-items:center;gap:14px}
.dl .code .qr{width:112px;height:112px;border:1.5px solid var(--ink);border-radius:2px;display:grid;grid-template-columns:repeat(7,1fr);grid-template-rows:repeat(7,1fr);padding:9px;gap:2px}
.dl .code .qr i{background:var(--ink);border-radius:1px}
.dl .code span{font-size:12px;color:var(--ink3);letter-spacing:.1em}

/* ============ 页脚：极简 ============ */
footer{padding:64px 0 56px}
.fnav{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:34px;border-bottom:1px solid var(--line)}
.fnav .cols{display:flex;gap:70px;flex-wrap:wrap}
.fnav h4{font-size:11px;letter-spacing:.24em;text-transform:uppercase;color:var(--ink3);font-weight:500;margin-bottom:16px}
.fnav a{display:block;font-size:13.5px;color:var(--ink2);padding:5px 0;transition:.16s}
.fnav a:hover{color:var(--ink)}
.fcp{padding-top:28px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:12px;color:var(--ink3);letter-spacing:.02em}

/* ============================================================
   L1 栏目页
   ============================================================ */
.phead{padding:96px 0 64px;border-bottom:1px solid var(--line)}
.phead h1{font-size:56px;font-weight:800;letter-spacing:-.045em;line-height:1.1;margin:22px 0 24px}
.phead p{font-size:15px;color:var(--ink2);max-width:640px;line-height:2}
.plist{padding:0 0 100px}
.prow{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:baseline;padding:34px 0;border-bottom:1px solid var(--line);transition:.2s}
.prow:hover{background:var(--bg2)}
.prow h3{font-size:22px;font-weight:700;letter-spacing:-.025em;line-height:1.42;margin-bottom:12px}
.prow p{font-size:14px;color:var(--ink2);line-height:1.95;max-width:760px}
.prow .meta{margin-top:14px;font-size:11.5px;color:var(--ink3);letter-spacing:.14em;text-transform:uppercase}
.prow .no{font-size:12px;color:var(--ink4);letter-spacing:.14em;white-space:nowrap}
.pager{display:flex;gap:10px;padding-top:52px}
.pager a{min-width:40px;height:40px;line-height:38px;text-align:center;border:1px solid var(--line2);border-radius:2px;font-size:13px;color:var(--ink2);padding:0 13px;transition:.16s}
.pager a:hover{border-color:var(--ink);color:var(--ink)}
.pager a.cur{background:var(--ink);border-color:var(--ink);color:#fff}

/* ============================================================
   L2 文章页
   ============================================================ */
.ahead{padding:90px 0 56px}
.ahead h1{font-size:44px;font-weight:800;letter-spacing:-.04em;line-height:1.22;margin:22px 0 28px}
.ameta{display:flex;gap:26px;flex-wrap:wrap;font-size:11.5px;color:var(--ink3);letter-spacing:.14em;text-transform:uppercase;padding-top:26px;border-top:1px solid var(--line)}
.ameta b{color:var(--ink);font-weight:600}
.abody{padding:0 0 90px}
.abody p{font-size:16px;color:var(--ink2);line-height:2.1;margin-bottom:22px}
.abody h2{font-size:24px;font-weight:700;letter-spacing:-.02em;margin:52px 0 20px}
.abody figure{margin:44px 0;border:1px solid var(--line);border-radius:2px;overflow:hidden}
.abody .imph{height:300px;background:var(--bg3);display:flex;align-items:center;justify-content:center;color:var(--ink4);font-size:12px;letter-spacing:.24em;text-transform:uppercase}
.anote{margin-top:52px;padding-top:26px;border-top:1px solid var(--line);font-size:12.5px;color:var(--ink3);line-height:2}
.anav{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:44px}
.anav a{background:#fff;padding:26px 28px;transition:.18s}
.anav a:hover{background:var(--bg2)}
.anav a span{display:block;font-size:11px;color:var(--ink3);letter-spacing:.24em;text-transform:uppercase;margin-bottom:9px}
.anav a b{font-size:14.5px;font-weight:600;line-height:1.6}
.anav a.nx{text-align:right}
.aback{display:inline-block;margin-top:34px;font-size:13px;color:var(--ink3);border-bottom:1px solid var(--line2);padding-bottom:2px}
.aback:hover{color:var(--ink);border-color:var(--ink)}

/* ============================================================
   信息页
   ============================================================ */
.pg{padding:0 0 100px}
.pg h2{font-size:22px;font-weight:700;letter-spacing:-.02em;margin:46px 0 16px}
.pg h2:first-child{margin-top:0}
.pg p{font-size:15px;color:var(--ink2);line-height:2.05;margin-bottom:16px}
.pg ul{list-style:none;margin:0 0 16px}
.pg li{font-size:14.5px;color:var(--ink2);line-height:2;padding-left:22px;position:relative;margin-bottom:10px}
.pg li::before{content:"";position:absolute;left:0;top:13px;width:8px;height:1px;background:var(--ink)}
.err{padding:60px 0 0}
.err .code{font-size:80px;font-weight:300;letter-spacing:-.06em;line-height:1;margin-bottom:18px}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1024px){
  .hero .wrap{grid-template-columns:1fr;gap:56px;align-items:start}
  .hero h1{font-size:56px}
  .phone{max-width:250px;margin:0}
  .ni{grid-template-columns:64px 1fr;gap:24px}
  .ni p{grid-column:2}
  .sec-h h2{font-size:30px}
  .feature h2{font-size:38px}
  .phead h1{font-size:42px}
  .ahead h1{font-size:34px}
}
@media (max-width:900px){
  .wrap,.narrow{padding:0 24px}
  .nmenu{display:none}
  .mbtn{display:block}
  .nav .btn-k{margin-left:auto;margin-right:10px}
  .nav .wrap{height:64px}
  .hero{padding:80px 0 72px}
  .hero h1{font-size:42px}
  .sec{padding:88px 0}
  .sec-h{margin-bottom:44px}
  .feature{padding:96px 0}
  .feature h2{font-size:30px}
  .dl{padding:96px 0}
  .dl h2{font-size:30px}
  .stats .wrap{grid-template-columns:1fr 1fr;gap:32px;padding:38px 24px}
  .st{padding-right:0;border-right:none}
  .st:nth-child(odd){border-right:1px solid var(--line);padding-right:20px}
  .st b{font-size:32px}
  .phead{padding:64px 0 44px}
  .phead h1{font-size:34px}
  .ahead{padding:60px 0 40px}
  .ahead h1{font-size:27px}
  .spec .sr{grid-template-columns:1fr;gap:8px}
}
@media (max-width:600px){
  .hero h1{font-size:34px;letter-spacing:-.03em}
  .hero .sub{font-size:15px}
  .hero .btns{flex-direction:column;align-items:stretch}
  .hero .btns a{text-align:center}
  .ni{grid-template-columns:1fr;gap:12px;padding:28px 0}
  .ni p{grid-column:auto}
  .ni h3{font-size:18px}
  .stats .wrap{grid-template-columns:1fr 1fr}
  .prow{grid-template-columns:1fr;gap:12px}
  .prow .no{display:none}
  .anav{grid-template-columns:1fr}
  .anav a.nx{text-align:left}
  .fnav{flex-direction:column;gap:28px}
  .fnav .cols{gap:44px}
  .fcp{flex-direction:column;gap:8px}
  .abody p{font-size:15.5px}
  .btn-k,.btn-w{padding:11px 22px}
}