:root{
  --brand:#0891b2; --brand2:#2bb3a3; --bg:#f2f3f5; --panel:#fff;
  --line:#e6e8eb; --text:#18191c; --sub:#8a8f99; --mine:#95ec69; --other:#fff;
  --danger:#e5484d; --ok:#22a06b; --warn:#f5a623;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;font-family:-apple-system,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--text);background:var(--bg)}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select{font:inherit}
#app{max-width:540px;margin:0 auto;height:100vh;display:flex;flex-direction:column;background:var(--bg);position:relative;box-shadow:0 0 40px rgba(0,0,0,.08)}
.screen{display:none;flex:1;flex-direction:column;overflow:hidden}
.screen.on{display:flex}
.nav{height:46px;flex:0 0 auto;background:linear-gradient(90deg,var(--brand2),var(--brand));color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:16px;position:relative}
.nav .back{position:absolute;left:12px;font-size:22px}
.nav .right{position:absolute;right:12px;font-size:18px}
.body{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}
.tabbar{height:54px;flex:0 0 auto;background:#fafafa;border-top:1px solid var(--line);display:flex}
.tabbar button{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:11px;color:var(--sub)}
.tabbar button.on{color:var(--brand)}
.row{display:flex;align-items:center;gap:12px;padding:11px 14px;background:var(--panel);border-bottom:1px solid var(--line);cursor:pointer}
.row:active{background:#f0f1f3}
.av{width:44px;height:44px;border-radius:8px;flex:0 0 auto;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:16px;overflow:hidden}
.av.sm{width:36px;height:36px;font-size:14px}
.row .mid{flex:1;min-width:0}
.row .mid b{display:block;font-weight:600;font-size:15px}
.row .mid span{display:block;color:var(--sub);font-size:13px;margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row .rt{text-align:right;flex:0 0 auto}
.row .rt small{display:block;color:var(--sub);font-size:11px}
.badge{display:inline-block;min-width:18px;height:18px;line-height:18px;border-radius:9px;background:var(--danger);color:#fff;font-size:11px;text-align:center;padding:0 5px;margin-top:3px}
.dot{width:9px;height:9px;border-radius:50%;background:var(--danger);display:inline-block}
.sec{background:#f7f8fa;color:var(--sub);font-size:12px;padding:7px 14px}
.field{margin:12px 14px}
.field label{display:block;font-size:12px;color:var(--sub);margin-bottom:6px}
.field input{width:100%;height:46px;border:1px solid var(--line);border-radius:10px;padding:0 12px;background:#fff;outline:none}
.field input:focus{border-color:var(--brand)}
.btn{display:block;width:calc(100% - 28px);margin:14px;height:46px;border-radius:10px;background:linear-gradient(90deg,var(--brand2),var(--brand));color:#fff;font-weight:600;font-size:16px}
.btn:disabled{opacity:.5}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn.sm{width:auto;height:34px;font-size:13px;padding:0 14px;margin:0;display:inline-block}
.caprow{display:flex;gap:10px;align-items:center}
.caprow input{flex:1}
.capimg{width:120px;height:44px;border-radius:8px;flex:0 0 auto;cursor:pointer;border:1px solid var(--line)}
.hint{font-size:12px;color:var(--sub);text-align:center;margin-top:8px}
.err{color:var(--danger);font-size:13px;text-align:center;margin:8px 14px;min-height:18px}
.brandhero{text-align:center;padding:34px 0 6px}
.brandhero img{width:84px;height:84px;border-radius:20px;box-shadow:0 8px 20px rgba(8,145,178,.28)}
.brandhero h1{font-size:24px;margin:12px 0 2px}
.brandhero p{color:var(--sub);font-size:13px;margin:0}
.chatwrap{flex:1;overflow-y:auto;padding:12px 12px 4px}
.bubble{display:flex;gap:8px;margin-bottom:14px;align-items:flex-start}
.bubble .b{max-width:72%;padding:9px 12px;border-radius:8px;background:var(--other);font-size:14.5px;line-height:1.45;box-shadow:0 1px 1px rgba(0,0,0,.05);word-break:break-word;white-space:pre-wrap}
.bubble.me{flex-direction:row-reverse}
.bubble.me .b{background:var(--mine)}
.bname{font-size:11px;color:var(--sub);margin-bottom:3px}
.time{text-align:center;color:#aab0b8;font-size:11px;margin:8px 0 14px}
.typing{color:var(--sub);font-size:12px;padding-left:52px;margin-bottom:10px}
.inputbar{flex:0 0 auto;background:#f7f7f7;border-top:1px solid var(--line);padding:8px 10px;display:flex;gap:8px;align-items:center}
.inputbar input{flex:1;height:38px;border:1px solid var(--line);border-radius:8px;padding:0 10px;background:#fff;outline:none}
.inputbar .send{background:var(--brand);color:#fff;border-radius:8px;height:38px;padding:0 16px;font-size:14px}
.inputbar .send:disabled{opacity:.5}
.mecard{background:#fff;padding:22px 16px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line)}
.mecard .av{width:60px;height:60px;border-radius:12px;font-size:22px}
.mecard b{font-size:19px}
.mecard span{color:var(--sub);font-size:13px}
.searchbar{padding:9px 12px;background:#ededed}
.searchbar input{width:100%;height:34px;border-radius:8px;border:none;padding:0 12px;background:#fff;outline:none;font-size:13px}
.freq{display:flex;align-items:center;gap:10px;padding:11px 14px;background:#fff;border-bottom:1px solid var(--line)}
.freq .mid{flex:1}
.freq .mid b{font-size:14px}
.freq .mid span{font-size:12px;color:var(--sub)}
.mini{padding:5px 10px;border-radius:7px;background:#eef2f7;font-size:12px}
.mini.pri{background:var(--brand);color:#fff}
.tag{font-size:11px;padding:1px 7px;border-radius:10px;background:#eef2f5;color:#5b6570}
.sectitle{font-size:12px;color:var(--sub);padding:10px 14px 6px}
.center-msg{text-align:center;color:var(--sub);padding:40px 20px;font-size:14px}
.spin{display:inline-block;width:14px;height:14px;border:2px solid #fff;border-top-color:transparent;border-radius:50%;animation:sp .8s linear infinite;vertical-align:-2px}
@keyframes sp{to{transform:rotate(360deg)}}

/* ---------------- 底部弹层（修改昵称/头像、改密码、关于） ---------------- */
.sheet-mask{position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:50;display:flex;align-items:flex-end;justify-content:center}
.sheet-mask.hide{display:none}
.sheet{width:100%;max-width:480px;background:#fff;border-radius:16px 16px 0 0;padding:18px 18px calc(18px + env(safe-area-inset-bottom));animation:sheetUp .18s ease;max-height:88vh;overflow:auto}
@keyframes sheetUp{from{transform:translateY(30px);opacity:.6}to{transform:translateY(0);opacity:1}}
.sheet h3{margin:0 0 14px;font-size:16px;text-align:center}
.sheet .field{margin-bottom:12px}
.sheet .field label{display:block;font-size:12px;color:var(--sub);margin-bottom:6px}
.sheet .field input{width:100%;height:44px;border:1px solid var(--line);border-radius:10px;padding:0 12px;font-size:15px;outline:none;box-sizing:border-box}
.sheet .field input:focus{border-color:var(--brand)}
.sheet .rowbtns{display:flex;gap:10px;margin-top:16px}
.sheet .rowbtns .btn{margin:0;flex:1}
.sheet .avatar-pick{display:flex;flex-direction:column;align-items:center;gap:12px;margin-bottom:16px}
.sheet .avatar-pick .big{width:84px;height:84px;border-radius:20px;font-size:30px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;overflow:hidden;background-size:cover;background-position:center}
.sheet .avatar-pick .big img{width:100%;height:100%;object-fit:cover}
.sheet .about-row{display:flex;justify-content:space-between;padding:11px 0;border-bottom:1px solid var(--line);font-size:14px}
.sheet .about-row:last-child{border-bottom:none}
.sheet .about-row span:first-child{color:var(--sub)}
.sheet .about-brand{text-align:center;padding:8px 0 16px}
.sheet .about-brand img{width:64px;height:64px;border-radius:16px}
.sheet .about-brand h4{margin:10px 0 2px;font-size:18px}
.sheet .about-brand p{margin:0;color:var(--sub);font-size:12px}
.sheet .mini-err{color:var(--danger, #e5484d);font-size:13px;min-height:18px;text-align:center;margin-top:6px}

/* ---------------- 附件上传 / 文档消息 ---------------- */
.clip{flex:0 0 auto;width:40px;height:40px;border:none;border-radius:10px;background:var(--line);color:#555;font-size:22px;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center}
.clip:active{background:#dfe4ea}
.attachbar{display:flex;gap:8px;flex-wrap:wrap;padding:8px 12px;background:#fff;border-top:1px solid var(--line)}
.attachbar.hide{display:none}
.chip{display:flex;align-items:center;gap:6px;background:#eef2f5;border-radius:8px;padding:6px 10px;font-size:12px;max-width:100%}
.chip.pending{opacity:.55}
.chip .nm{max-width:170px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chip .x{color:#e5484d;cursor:pointer;font-weight:700;padding:0 2px}
.msgatt{display:flex;flex-direction:column;gap:4px;margin-top:6px}
.msgatt a{display:flex;align-items:center;gap:6px;background:#f2f4f7;border-radius:8px;padding:7px 10px;font-size:13px;color:#334;text-decoration:none;max-width:220px}
.msgatt a .nm{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msgatt a .sz{color:var(--sub);font-size:11px;margin-left:auto;flex:0 0 auto}
.bubble.me .msgatt a{background:rgba(255,255,255,.22);color:#fff}

/* 底部菜单图标（微信风格 SVG） */
.tabbar button svg{width:23px;height:23px;display:block}
.tabbar button span{font-size:11px;line-height:1}
.avatar-pick .av-hint{font-size:12px;color:var(--sub);margin-top:4px}
.avatar-pick .av-loading{font-size:12px;color:var(--sub)}

/* ---------------- 扫码登录 / 扫一扫 / 设备 ---------------- */
.qrbox{width:220px;height:220px;margin:26px auto 12px;background:#fff;border-radius:14px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;padding:10px;box-shadow:0 6px 20px rgba(8,145,178,.10)}
.qrbox svg{width:100%;height:100%;display:block}
.qrbox .qr-loading{color:var(--sub);font-size:13px}
.qr-tip{color:var(--text);font-size:14px;font-weight:600;margin-top:4px}
.qr-sub{color:var(--sub);font-size:12px;margin-top:8px}
.qr-sub.ok{color:var(--ok)}
.qr-sub.err{color:var(--danger)}
.scanwrap{position:relative;width:270px;height:270px;margin:24px auto 8px;border-radius:14px;overflow:hidden;background:#111}
.scanwrap video{width:100%;height:100%;object-fit:cover}
.scan-frame{position:absolute;inset:38px;border:2px solid rgba(255,255,255,.85);border-radius:12px;box-shadow:0 0 0 999px rgba(0,0,0,.28)}
.mecard2{background:#fff;margin:10px 0;padding:16px;display:flex;flex-direction:column;align-items:center}
.devrow{display:flex;align-items:center;gap:12px;padding:13px 14px;background:#fff;border-bottom:1px solid var(--line)}
.devrow .ico{width:38px;height:38px;border-radius:9px;background:#eef4f6;color:var(--brand);display:flex;align-items:center;justify-content:center;font-size:18px;flex:0 0 auto}
.devrow .mid{flex:1;min-width:0}
.devrow .mid b{font-size:14.5px;font-weight:600}
.devrow .mid span{display:block;color:var(--sub);font-size:12px;margin-top:3px}
.devrow .mini{flex:0 0 auto}
.mini.disabled{opacity:.45;pointer-events:none}
.zcno{color:var(--sub);font-size:13px;margin-top:2px}
.zcno b{color:var(--text)}

/* ---------------- 电脑端两栏自适应（宽窗口 = 左列表 + 右聊天） ---------------- */
#rightcol{display:none;flex:1;min-height:0;flex-direction:column}
#rightcol:has(.screen.on){display:flex}
#detail-empty{display:none;flex:1;flex-direction:column;align-items:center;justify-content:center;color:var(--sub);background:var(--bg)}
#detail-empty img{width:78px;height:78px;border-radius:20px;opacity:.55}
#detail-empty p{margin:16px 0 0;font-size:14px}

/* 宽窗口 + 处于主界面/聊天类页面时：左栏常驻，右栏展示内容 */
#app.desktop{max-width:none;width:100%;margin:0;flex-direction:row;box-shadow:none}
#app.desktop #s-main{flex:0 0 330px;max-width:330px;border-right:1px solid var(--line);display:flex!important}
#app.desktop #rightcol{display:flex!important}
#app.desktop #detail-empty{display:flex}
#app.desktop #rightcol:has(.screen.on) #detail-empty{display:none}
#app.desktop .nav{justify-content:flex-start;padding-left:14px}
#app.desktop #main-nav{padding-left:16px;font-size:15px}
#app.desktop #s-chat .nav{justify-content:center;padding-left:0}
#app.desktop .body::-webkit-scrollbar,#app.desktop .chatwrap::-webkit-scrollbar{width:8px}
#app.desktop .body::-webkit-scrollbar-thumb,#app.desktop .chatwrap::-webkit-scrollbar-thumb{background:#d4d8de;border-radius:8px}
/* 电脑端底部弹层改为居中卡片 */
#app.desktop ~ #sheet .sheet,#app.desktop .sheet{max-width:440px;border-radius:16px;margin-bottom:6vh;padding-bottom:18px}
#app.desktop ~ #sheet.sheet-mask,#sheet.desktop-sheet{align-items:center}