:root{--blue:#1673ff;--blue-d:#0d56c4;--bg:#fff;--bg2:#f3f5f9;--fg:#0b0f17;--mut:#6b7587;--line:#e3e7ee;--mine:#1673ff;--mine-fg:#fff;--other:#eef1f6;--danger:#e5484d;--ok:#12a150;--nav-h:58px;--radius:14px}
body[data-theme=dark]{--bg:#0b0f17;--bg2:#121826;--fg:#e8edf7;--mut:#8b96ab;--line:#1f2838;--other:#1a2233;--other-fg:#e8edf7}
body[data-theme=blue]{--bg:#f2f8ff;--bg2:#e0eeff;--fg:#06223f;--mut:#4d6a8a;--line:#c8dcf5;--mine:#0b5fe0;--other:#dbeaff}
body[data-theme=pink]{--bg:#fff5fa;--bg2:#ffe3f0;--fg:#3d0a24;--mut:#8f5a74;--line:#f6cbe0;--blue:#e5248f;--blue-d:#b81a72;--mine:#e5248f;--other:#ffe0ef}
*{box-sizing:border-box}html,body{height:100%}
body{margin:0;font:15px/1.45 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--fg);-webkit-tap-highlight-color:transparent}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}a{color:var(--blue)}
:focus-visible{outline:2px solid var(--blue);outline-offset:2px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
#splash{position:fixed;inset:0;display:flex;flex-direction:column;gap:.8rem;align-items:center;justify-content:center;background:var(--blue);color:#fff;z-index:100;font-size:1.6rem;letter-spacing:.2em;transition:opacity .4s}
#splash img{animation:pop .9s ease-out}@keyframes pop{from{transform:scale(.5);opacity:0}to{transform:scale(1);opacity:1}}
#splash.hide{opacity:0;pointer-events:none}
.sr{position:absolute;left:-9999px}
.btn{background:var(--blue);color:#fff;border:0;border-radius:10px;padding:.65rem 1rem;font-weight:600}
.btn.sec{background:var(--bg2);color:var(--fg)}.btn.danger{background:var(--danger)}.btn.sm{padding:.35rem .7rem;font-size:.85rem}.btn:disabled{opacity:.5}
.field{display:block;margin:.7rem 0}.field>span{display:block;font-size:.85rem;color:var(--mut);margin-bottom:.25rem}
.input,select.input,textarea.input{width:100%;padding:.65rem .75rem;border-radius:10px;border:1px solid var(--line);background:var(--bg)}
.hint{font-size:.8rem;color:var(--mut)}.err{color:var(--danger);font-size:.85rem}
.card{background:var(--bg2);border-radius:var(--radius);padding:1rem;margin:.6rem 0}
.row{display:flex;align-items:center;gap:.6rem}.grow{flex:1;min-width:0}.mut{color:var(--mut)}.sm{font-size:.85rem}
.avatar{width:44px;height:44px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:700;overflow:hidden;flex:none}
.avatar img{width:100%;height:100%;object-fit:cover}.avatar.lg{width:88px;height:88px;font-size:2rem}
.badge{display:inline-grid;place-items:center;min-width:20px;height:20px;padding:0 6px;border-radius:10px;background:var(--blue);color:#fff;font-size:.72rem}
.tick{color:#1d9bf0}.crown{color:#f5a623}
/* auth */
.auth{max-width:420px;margin:0 auto;padding:2rem 1.2rem}.auth h1{color:var(--blue)}
.steps{display:flex;gap:4px;margin:1rem 0}.steps i{flex:1;height:4px;border-radius:2px;background:var(--line)}.steps i.on{background:var(--blue)}
.choice{display:grid;grid-template-columns:1fr 1fr;gap:.5rem}.choice label{border:1px solid var(--line);border-radius:10px;padding:.6rem;display:flex;gap:.4rem}
/* shell */
.shell{display:grid;grid-template-columns:340px 1fr;height:100dvh}
.side{border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;background:var(--bg)}
.side header{display:flex;align-items:center;gap:.5rem;padding:.7rem .8rem;border-bottom:1px solid var(--line)}
.side header b{color:var(--blue);font-size:1.15rem;flex:1}
.list{overflow:auto;flex:1}.item{display:flex;gap:.7rem;padding:.7rem .9rem;border-bottom:1px solid var(--line);cursor:pointer;align-items:center}
.item:hover,.item.on{background:var(--bg2)}.item .t{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.item .p{color:var(--mut);font-size:.85rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.main{display:flex;flex-direction:column;min-height:0;min-width:0}
.menu{display:flex;overflow:auto;gap:.3rem;padding:.4rem .6rem;border-bottom:1px solid var(--line)}
.menu a{padding:.35rem .7rem;border-radius:999px;text-decoration:none;color:var(--fg);white-space:nowrap;font-size:.88rem}.menu a.on{background:var(--blue);color:#fff}
.page{overflow:auto;padding:1rem;max-width:760px;width:100%;margin:0 auto}
.empty{padding:2rem;text-align:center;color:var(--mut)}
.skel{background:linear-gradient(90deg,var(--bg2),var(--line),var(--bg2));background-size:200% 100%;animation:sk 1.2s infinite;border-radius:8px;height:48px;margin:.5rem .9rem}@keyframes sk{to{background-position:-200% 0}}
/* chat */
.chat{display:flex;flex-direction:column;height:100%;min-height:0}
.chat-top{display:flex;align-items:center;gap:.6rem;padding:.6rem .8rem;border-bottom:1px solid var(--line);background:var(--bg)}
.chat-top .name{font-weight:700}.iconbtn{background:none;border:0;font-size:1.25rem;padding:.3rem .5rem;border-radius:8px}.iconbtn:hover{background:var(--bg2)}
.msgs{flex:1;overflow:auto;padding:.8rem;display:flex;flex-direction:column;gap:.25rem;background:var(--bg)}
.bub{max-width:min(78%,520px);padding:.45rem .7rem;border-radius:16px;background:var(--other);color:var(--other-fg,var(--fg));align-self:flex-start;word-wrap:anywhere;position:relative}
.bub.mine{background:var(--mine);color:var(--mine-fg);align-self:flex-end}
.bub .who{font-size:.75rem;font-weight:700;color:var(--blue)}.bub.mine .who{display:none}
.bub .meta{font-size:.68rem;opacity:.75;text-align:right;margin-top:2px}
.bub.del{font-style:italic;opacity:.65}.bub .reply{border-left:3px solid var(--blue);padding:.1rem .5rem;margin-bottom:.25rem;font-size:.8rem;opacity:.9;background:rgba(127,127,127,.12);border-radius:4px}
.bub img,.bub video{max-width:100%;border-radius:10px;display:block}.bub .react{display:flex;gap:.25rem;flex-wrap:wrap;margin-top:.2rem}.bub .react button{border:0;background:rgba(127,127,127,.2);border-radius:999px;padding:.05rem .45rem;font-size:.8rem}
.bub .react button.me{outline:1px solid var(--blue)}
.sys{align-self:center;font-size:.78rem;color:var(--mut);background:var(--bg2);padding:.15rem .6rem;border-radius:999px}
.sticker{font-size:3.2rem;line-height:1.1;background:none!important;padding:0}
.pinbar{padding:.35rem .8rem;background:var(--bg2);border-bottom:1px solid var(--line);font-size:.85rem;cursor:pointer}
.composer{border-top:1px solid var(--line);padding:.5rem;background:var(--bg)}
.composer .bar{display:flex;gap:.3rem;align-items:flex-end}.composer textarea{flex:1;resize:none;max-height:120px;padding:.55rem .7rem;border-radius:20px;border:1px solid var(--line);background:var(--bg2)}
.ctx{display:flex;justify-content:space-between;font-size:.8rem;background:var(--bg2);padding:.3rem .6rem;border-radius:8px;margin-bottom:.3rem}
.tray{display:grid;grid-template-columns:repeat(8,1fr);gap:.2rem;max-height:180px;overflow:auto;padding:.4rem;background:var(--bg2);border-radius:10px;margin-bottom:.4rem}
.tray button{background:none;border:0;font-size:1.5rem;border-radius:8px}.tray button:hover{background:var(--line)}
.pop{position:fixed;background:var(--bg);border:1px solid var(--line);border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,.25);z-index:60;min-width:190px;overflow:hidden}
.pop button{display:block;width:100%;text-align:left;border:0;background:none;padding:.55rem .9rem}.pop button:hover{background:var(--bg2)}.pop .rx{display:flex;justify-content:space-around;padding:.3rem;border-bottom:1px solid var(--line)}.pop .rx button{width:auto;font-size:1.2rem;padding:.2rem}
.vo{background:rgba(127,127,127,.2);border:1px dashed currentColor;border-radius:10px;padding:.5rem .8rem;cursor:pointer}
/* nav + modal + toast */
.bottom{display:none}
#toasts{position:fixed;left:50%;transform:translateX(-50%);bottom:76px;display:flex;flex-direction:column;gap:.4rem;z-index:90;align-items:center}
.toast{background:#111a;background:#1b2436;color:#fff;padding:.55rem .9rem;border-radius:10px;box-shadow:0 4px 18px rgba(0,0,0,.3);max-width:90vw}.toast.err{background:var(--danger)}
.modal-bg{position:fixed;inset:0;background:rgba(0,0,0,.5);display:grid;place-items:center;z-index:80;padding:1rem}
.modal{background:var(--bg);border-radius:16px;padding:1.1rem;width:min(460px,100%);max-height:90dvh;overflow:auto}.modal h3{margin-top:0}.modal .acts{display:flex;gap:.5rem;justify-content:flex-end;margin-top:1rem}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:.7rem}.prod{background:var(--bg2);border-radius:12px;padding:.8rem}
.prod h4{margin:.2rem 0}.banner{height:110px;border-radius:12px;background:linear-gradient(120deg,var(--blue),#7cc0ff) center/cover}
.kv{display:flex;justify-content:space-between;padding:.4rem 0;border-bottom:1px solid var(--line)}
.qr svg{max-width:100%;height:auto;border-radius:8px}
@media (max-width:820px){
  .shell{grid-template-columns:1fr;padding-bottom:var(--nav-h)}
  .shell .side{display:flex}.shell.in-chat .side{display:none}.shell:not(.in-chat) .main{display:none}.shell.page-open .side{display:none}.shell.page-open .main{display:flex}
  .bottom{display:flex;position:fixed;left:0;right:0;bottom:0;height:var(--nav-h);background:var(--bg);border-top:1px solid var(--line);z-index:40;padding-bottom:env(safe-area-inset-bottom)}
  .shell.in-chat~.bottom{display:none}.shell.in-chat{padding-bottom:0}
  .bottom a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:.7rem;text-decoration:none;color:var(--mut);gap:2px}.bottom a.on{color:var(--blue)}.bottom a span{font-size:1.25rem}
  .bub{max-width:88%}
}