:root{--g:#0c4a3e;--g2:#12805f;--acc:#17a673;--bg:#f3f7f6;--card:#fff;--tx:#14201d;--mu:#7a8a86;--ln:#e4ecea;--out:#dcf6e8;--in:#fff}
:root[data-theme=dark]{--bg:#0f1715;--card:#16211e;--tx:#e8f1ee;--mu:#8ea39d;--ln:#243430;--out:#14503f;--in:#1d2b27}
*{box-sizing:border-box;margin:0}
html,body{height:100%}
body{font-family:Vazirmatn,Tahoma,sans-serif;background:var(--bg);color:var(--tx);padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}
button,input{font:inherit;color:inherit}
button{cursor:pointer;border:0;background:none}
:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
.app{display:grid;grid-template-columns:84px 340px 1fr;height:100%;max-width:1500px;margin:auto}
.rail{background:var(--g);display:flex;flex-direction:column;align-items:center;gap:6px;padding:16px 6px;color:#fff}
.logo{font-weight:700;letter-spacing:1px;margin-bottom:18px;font-size:15px}
.nav{color:#cfe8df;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:20px;padding:8px 4px;border-radius:12px;width:100%}
.nav span{font-size:10px}.nav.on,.nav:hover{background:rgba(255,255,255,.12)}
.grow{flex:1}
.list{background:var(--card);border-inline-start:1px solid var(--ln);display:flex;flex-direction:column;min-height:0}
.list header{padding:18px 18px 8px}.list h2{font-size:18px}
#search{margin:6px 14px 10px;padding:10px 14px;border:1px solid var(--ln);border-radius:12px;background:var(--bg)}
#chats{list-style:none;overflow:auto;padding:0 8px 8px}
#chats li{display:flex;gap:10px;align-items:center;padding:10px;border-radius:14px;cursor:pointer}
#chats li:hover{background:var(--bg)}#chats li.on{background:var(--out)}
.av{width:44px;height:44px;border-radius:50%;background:var(--g2);color:#fff;display:grid;place-items:center;font-weight:700;flex:none}
.meta{flex:1;min-width:0}.meta b{display:flex;justify-content:space-between;font-size:14px}
.meta b i{font-style:normal;font-weight:400;font-size:11px;color:var(--mu)}
.meta p{font-size:12px;color:var(--mu);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}
.badge{background:var(--acc);color:#fff;border-radius:10px;font-size:11px;padding:0 7px;margin-inline-start:6px}
.chat{display:none;flex-direction:column;min-height:0;background:var(--bg)}
.chat.open{display:flex}
.empty{grid-column:3;grid-row:1;display:grid;place-items:center;color:var(--mu)}
.chat.open~.empty{display:none}
.chat{grid-column:3;grid-row:1}
.chat header{display:flex;align-items:center;gap:12px;padding:12px 18px;background:var(--card);border-bottom:1px solid var(--ln)}
.chat header small{display:block;color:var(--mu);font-size:12px}
.back{display:none;font-size:28px;line-height:1}
.msgs{flex:1;overflow:auto;padding:18px;display:flex;flex-direction:column;gap:8px}
.m{max-width:min(70%,520px);padding:9px 13px;border-radius:16px;background:var(--in);box-shadow:0 1px 2px rgba(0,0,0,.06);font-size:14px;line-height:1.7;word-wrap:break-word}
.m.me{align-self:flex-start;background:var(--out);border-end-start-radius:4px}
.m.th{align-self:flex-end;border-end-end-radius:4px}
.m small{display:block;font-size:10px;color:var(--mu);margin-top:2px}
.m .who{color:var(--g2);font-size:12px;font-weight:700}
.file{display:flex;gap:8px;align-items:center}.file b{font-size:13px}
.compose{display:flex;gap:8px;align-items:center;padding:12px 14px;background:var(--card);border-top:1px solid var(--ln)}
.compose #text{flex:1;border:1px solid var(--ln);background:var(--bg);border-radius:22px;padding:11px 16px;min-width:0}
.ic{font-size:20px;cursor:pointer;padding:4px}
.send{background:var(--acc);color:#fff;width:42px;height:42px;border-radius:50%;transform:scaleX(-1)}
.pick{position:absolute;bottom:70px;inset-inline-start:14px;background:var(--card);border:1px solid var(--ln);border-radius:14px;padding:8px;display:grid;grid-template-columns:repeat(6,1fr);gap:4px;font-size:22px;z-index:5}
@media(max-width:820px){
 .app{grid-template-columns:1fr;grid-template-rows:1fr auto}
 .rail{grid-row:2;flex-direction:row;justify-content:space-around;padding:6px}
 .rail .logo,.grow{display:none}.nav{width:auto;font-size:18px}
 .list{grid-row:1}.chat,.empty{grid-column:1;grid-row:1}.empty{display:none}
 .chat.open{display:flex;position:fixed;inset:0;z-index:9;padding-top:env(safe-area-inset-top)}
 .back{display:block}.m{max-width:85%}
}
@media(prefers-reduced-motion:no-preference){.m{animation:in .18s ease-out}@keyframes in{from{opacity:0;transform:translateY(6px)}}}