:root{
  --brand:#e23b3b; --brand-dark:#b71f1f; --ink:#222; --muted:#888;
  --card:#fff; --line:#eee; --ok:#19be6b; --warn:#ff9900;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;background:#f2f2f2;color:var(--ink)}
body{display:flex;justify-content:center}
/* 手机外框 */
.phone{width:100%;max-width:420px;min-height:100vh;background:var(--brand);position:relative;overflow:hidden;display:flex;flex-direction:column}
.brandbar{padding:14px 16px;color:#fff;display:flex;align-items:center;gap:10px;background:linear-gradient(180deg,var(--brand),var(--brand-dark))}
.logo{width:34px;height:34px;border-radius:9px;background:#fff;color:var(--brand);font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px;flex:0 0 auto}
.brandbar .t1{font-weight:700;font-size:16px}
.brandbar .t2{font-size:11px;opacity:.85}
.stage{flex:1;position:relative;background:#f6f6f6;display:flex;flex-direction:column}
.screen{position:absolute;inset:0;display:none;flex-direction:column;padding:0}
.screen.active{display:flex}
/* 底部菜名纹理 */
.menu-foot{margin-top:auto;padding:10px 14px 16px;background:#fff;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:6px 12px;font-size:12px;color:#bbb}
.menu-foot span{border:1px dashed #ddd;padding:2px 8px;border-radius:20px}
/* 通用卡片屏 */
.center{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:30px 22px;text-align:center}
.center .ic{font-size:46px;margin-bottom:14px}
.center h2{font-size:18px;margin:0 0 8px}
.center p{color:var(--muted);font-size:13px;line-height:1.7;margin:6px 0}
.btn{display:inline-block;width:100%;max-width:300px;padding:13px 0;border:none;border-radius:24px;background:var(--brand);color:#fff;font-size:15px;font-weight:600;margin-top:14px;cursor:pointer}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn:active{transform:scale(.98)}
.spin{width:30px;height:30px;border:3px solid #eee;border-top-color:var(--brand);border-radius:50%;animation:sp 1s linear infinite;margin:0 auto 12px}
@keyframes sp{to{transform:rotate(360deg)}}
/* 用户卡片 */
.user-card{margin:18px;background:#fff;border-radius:14px;padding:16px;display:flex;align-items:center;gap:12px;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.avatar{width:46px;height:46px;border-radius:50%;background:#ddd;object-fit:cover;flex:0 0 auto}
.user-card .nm{font-weight:600}
.user-card .sub{color:var(--muted);font-size:12px;margin-top:2px}
/* 进群/加好友 卡片 */
.qr-card{margin:18px;background:#fff;border-radius:14px;padding:20px;text-align:center;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.qr-box{width:180px;height:180px;margin:10px auto;background:#fafafa;border:1px solid var(--line);border-radius:10px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}
.qr-box canvas{display:block}
.tip{background:#fff7f0;color:#c0392b;font-size:12px;padding:10px 14px;border-radius:10px;margin:0 18px}
/* 微信授权 sheet */
.mask{position:absolute;inset:0;background:rgba(0,0,0,.4);display:none;align-items:flex-end;z-index:20}
.mask.active{display:flex}
.sheet{width:100%;background:#fff;border-radius:14px 14px 0 0;padding:18px;animation:up .25s ease}
@keyframes up{from{transform:translateY(100%)}}
.sheet .row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid var(--line)}
.sheet .row .k{color:var(--muted);font-size:13px;width:70px}
.sheet h3{margin:0 0 6px;font-size:16px}
.sheet .desc{color:var(--muted);font-size:12px;line-height:1.6}
/* 企微会话风格 */
.chat{margin:14px;background:#fff;border-radius:12px;padding:12px;box-shadow:0 2px 8px rgba(0,0,0,.05)}
.chat .msg{background:#f1f1f1;border-radius:8px;padding:10px 12px;font-size:13px;line-height:1.7;max-width:85%}
.chat .bubble-link{color:var(--brand);text-decoration:underline;margin-top:8px;display:inline-block;font-weight:600}
/* 状态徽标 */
.badges{display:flex;gap:8px;justify-content:center;margin:10px 0}
.badge{font-size:12px;padding:4px 10px;border-radius:20px;background:#eee;color:#999}
.badge.on{background:#e8f8ef;color:var(--ok)}
.badge.on.f{background:#eaf3ff;color:#2b7cff}
.badge.on.g{background:#fff3e0;color:var(--warn)}
/* 演示浮层 */
.demo-fab{position:fixed;right:14px;bottom:14px;z-index:50;width:54px;height:54px;border-radius:50%;background:#333;color:#fff;border:none;font-size:11px;box-shadow:0 4px 12px rgba(0,0,0,.3);cursor:pointer}
.demo-bar{position:fixed;left:0;right:0;bottom:0;z-index:60;background:#222;color:#fff;padding:10px 12px;display:none;flex-wrap:wrap;gap:6px;font-size:12px}
.demo-bar.active{display:flex}
.demo-bar button{flex:1 1 30%;background:#444;color:#fff;border:none;border-radius:8px;padding:8px 4px;cursor:pointer;font-size:11px}
.demo-bar .close{position:absolute;right:8px;top:6px;background:none;font-size:16px}
.hidden{display:none!important}
.kbd{font-size:11px;color:var(--muted)}