/* 安卓 App 下载页（/app）：首屏下载按钮 + 横屏实拍 + 扫码，下方特点、安装步骤与常见问题。 */
.aa-page{--ink:#13283a;--muted:#5d7385;--line:#e1e9ef;--teal:#13806f;max-width:1320px;margin:0 auto;padding:22px 32px 56px;color:var(--ink)}
.aa-page h1,.aa-page h2{margin:0}

/* ---------- 首屏 ---------- */
.aa-hero{position:relative;isolation:isolate;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);grid-template-areas:"copy device" "qr device";gap:22px 48px;align-items:center;padding:38px 40px;border:1px solid #dfeae8;border-radius:26px;overflow:hidden;background:radial-gradient(600px 300px at 0% 0%,#d9f3ee,transparent 70%),radial-gradient(520px 300px at 100% 100%,#ffe9dc,transparent 70%),linear-gradient(135deg,#f3fbf9,#f4f7ff)}
.aa-copy{grid-area:copy}
.aa-eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 14px;padding:6px 14px 6px 8px;border:1px solid #d7e8e4;border-radius:999px;color:#22675d;background:#fff;font-size:14px;font-weight:800}
.aa-eyebrow span{width:22px;height:22px;display:grid;place-items:center;border-radius:50%;color:#fff;background:var(--teal);font-size:12px}
.aa-hero h1{font-size:clamp(30px,3vw,44px);line-height:1.22;font-weight:900}
.aa-hero h1 em{white-space:nowrap;font-style:normal;background:linear-gradient(90deg,#13806f,#2f7de1 55%,#7c5ce0);-webkit-background-clip:text;background-clip:text;color:transparent}
.aa-lead{max-width:520px;margin:14px 0 26px;color:var(--muted);font-size:17px;line-height:1.7}

.aa-download{display:grid;justify-items:start;gap:10px}
.aa-btn{display:inline-flex;align-items:center;gap:14px;padding:14px 28px 14px 20px;border-radius:16px;color:#fff;background:linear-gradient(135deg,#13806f,#1f9c86 60%,#2f7de1);box-shadow:0 14px 30px rgba(19,128,111,.28);transition:transform .15s ease,box-shadow .15s ease}
.aa-btn:hover{transform:translateY(-2px);box-shadow:0 18px 36px rgba(19,128,111,.34)}
.aa-btn[hidden]{display:none}
.aa-btn svg{width:30px;height:30px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.aa-btn span{display:grid;gap:2px}
.aa-btn b{font-size:20px;letter-spacing:.04em}
.aa-btn small{opacity:.88;font-size:13px;font-weight:700}
.aa-env{max-width:460px;margin:0;padding:10px 14px;border-radius:12px;color:#8a4b14;background:#fff3e2;font-size:14px;font-weight:700;line-height:1.6}
.aa-meta{margin:0;color:#7a8e9c;font-size:13px}

.aa-device{grid-area:device;margin:0;display:grid;gap:10px;justify-items:center}
.aa-phone{width:100%;padding:12px 16px;border-radius:30px;background:#16212b;box-shadow:0 26px 60px rgba(20,47,70,.28),inset 0 0 0 2px #2c3a46}
.aa-phone img{width:100%;height:auto;display:block;border-radius:18px}
.aa-device figcaption{color:#7a8e9c;font-size:12px}

.aa-qr{grid-area:qr;display:flex;align-items:center;gap:16px;width:max-content;padding:12px 18px 12px 12px;border:1px solid #dbe8e5;border-radius:18px;background:#fff}
.aa-qr img{width:96px;height:96px;display:block}
.aa-qr div{display:grid;gap:4px}
.aa-qr b{font-size:15px}
.aa-qr span{color:var(--muted);font-size:13px}

/* ---------- 特点 ---------- */
.aa-features{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:24px 0}
.aa-features article{display:grid;gap:6px;padding:18px 20px;border:1px solid var(--line);border-top:4px solid var(--c);border-radius:16px;background:#fff}
.aa-features b{color:var(--c);font-size:17px}
.aa-features span{color:var(--muted);font-size:14px;line-height:1.6}

/* ---------- 安装步骤与常见问题 ---------- */
.aa-columns{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:20px}
.aa-steps,.aa-faq{padding:24px 26px;border:1px solid var(--line);border-radius:20px;background:#fff}
.aa-columns h2{margin-bottom:16px;font-size:22px}
.aa-steps ol{display:grid;gap:18px;margin:0;padding:0;list-style:none}
.aa-steps li{display:flex;gap:14px}
.aa-steps i{width:34px;height:34px;display:grid;place-items:center;flex:0 0 auto;border-radius:50%;color:#fff;background:linear-gradient(135deg,#13806f,#2f7de1);font-style:normal;font-weight:900}
.aa-steps li div{display:grid;gap:4px;padding-top:4px}
.aa-steps li b{font-size:16px}
.aa-steps li span{color:var(--muted);font-size:14px;line-height:1.6}
.aa-faq details{border-top:1px solid var(--line)}
.aa-faq details:first-of-type{border-top:0}
.aa-faq summary{padding:13px 0;font-size:15px;font-weight:800;cursor:pointer}
.aa-faq p{margin:0 0 14px;color:var(--muted);font-size:14px;line-height:1.7}
.aa-faq code{display:block;margin-top:6px;padding:8px 10px;border-radius:8px;color:#3b5566;background:#f2f6f9;font:12px/1.5 Consolas,monospace;word-break:break-all}

/* ---------- 微信 / QQ 提示层 ---------- */
.aa-wechat{position:fixed;inset:0;z-index:1000;display:flex;justify-content:flex-end;padding:18px;background:rgba(10,24,36,.72)}
.aa-wechat[hidden]{display:none}
.aa-wechat>div{align-self:flex-start;max-width:290px;padding:18px 20px;border-radius:16px;color:var(--ink);background:#fff}
.aa-wechat b{font-size:18px}
.aa-wechat p{margin:8px 0 14px;color:var(--muted);line-height:1.6}
.aa-wechat p span{padding:0 6px;border-radius:6px;color:#fff;background:var(--ink);font-weight:900}
.aa-wechat button{padding:8px 20px;border:0;border-radius:999px;color:#fff;background:var(--teal);font-weight:800}

/* ---------- 窄屏 ---------- */
@media (max-width:900px){
  .aa-page{padding:14px 14px 40px}
  .aa-hero{grid-template-columns:1fr;grid-template-areas:"copy" "device";padding:24px 20px;gap:22px}
  .aa-qr{display:none}
  .aa-features{grid-template-columns:repeat(2,1fr)}
  .aa-columns{grid-template-columns:1fr}
}
/* 电脑访问者通常要用手机下载，二维码保留；触屏设备本身就在手机上，隐藏二维码。 */
@media (hover:none) and (pointer:coarse){.aa-qr{display:none}}