:root{
  --bg:#f8fafd; --surface:#fff; --text:#1f1f1f; --muted:#5f6368; --line:#e3e3e3;
  --primary:#0b57d0; --on-primary:#fff; --out:#0b57d0; --on-out:#fff;
  --in:#e9eef6; --on-in:#1f1f1f; --hover:#eef2f8; --active:#d3e3fd; --chip:#c2e7ff;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#131314; --surface:#1e1f20; --text:#e3e3e3; --muted:#a8a8a8; --line:#333;
    --primary:#a8c7fa; --on-primary:#062e6f; --out:#a8c7fa; --on-out:#062e6f;
    --in:#282a2c; --on-in:#e3e3e3; --hover:#232527; --active:#004a77; --chip:#004a77;
  }
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
html{background:var(--bg);color-scheme:light dark}
[hidden]{display:none !important}
body{font-family:Vazirmatn,system-ui,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}
.icon{font-family:'Material Symbols Rounded';font-size:24px;line-height:1;font-weight:normal;font-style:normal;display:inline-block;direction:ltr;-webkit-font-feature-settings:'liga';font-feature-settings:'liga'}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
.icon-btn{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:var(--muted)}
.icon-btn:hover{background:var(--hover)}

/* login */
.login{min-height:100%;display:grid;place-items:center;padding:16px}
.login form{background:var(--surface);padding:32px;border-radius:28px;width:100%;max-width:360px;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,.1)}
.login h1{font-size:22px;font-weight:500;margin:12px 0 24px}
.login input{width:100%;padding:14px 16px;border:1px solid var(--line);border-radius:12px;background:transparent;color:var(--text);font:inherit;margin-bottom:16px}
.login .err{color:#d93025;font-size:14px;margin-bottom:12px}
.btn{background:var(--primary);color:var(--on-primary);padding:10px 24px;border-radius:20px;font-weight:500}

/* layout */
.app{display:flex;height:100vh;height:100dvh;height:var(--app-h,100dvh);overflow:hidden}
html,body{overflow:hidden;overscroll-behavior:none}
.side{width:380px;flex-shrink:0;display:flex;flex-direction:column;border-left:1px solid var(--line)}
.main{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--surface)}
.topbar{display:flex;align-items:center;gap:8px;padding:12px 16px;min-height:64px}
.topbar h2{font-size:20px;font-weight:500;margin:0;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search{margin:0 16px 8px;display:flex;align-items:center;gap:8px;background:var(--in);border-radius:28px;padding:0 16px;height:48px}
.search input{flex:1;border:0;background:transparent;font:inherit;color:var(--text);outline:none}
.list{flex:1;overflow-y:auto;padding:4px 8px 96px}
.thread{display:flex;gap:12px;align-items:center;padding:12px;border-radius:16px;cursor:pointer}
.thread:hover{background:var(--hover)}
.thread.active{background:var(--active)}
.avatar{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:500;flex-shrink:0;font-size:17px}
.t-body{flex:1;min-width:0}
.t-row{display:flex;justify-content:space-between;gap:8px}
.t-name{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.t-time{font-size:12px;color:var(--muted);flex-shrink:0}
.t-snip{font-size:14px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}
.thread.unread .t-name,.thread.unread .t-snip,.thread.unread .t-time{font-weight:700;color:var(--text)}
.badge{background:var(--primary);color:var(--on-primary);border-radius:10px;font-size:11px;padding:0 7px;line-height:18px;margin-top:4px}
.fab{position:fixed;bottom:24px;right:24px;display:flex;align-items:center;gap:12px;background:var(--chip);color:var(--text);padding:16px 20px;border-radius:16px;font-weight:500;box-shadow:0 2px 6px rgba(0,0,0,.15);z-index:5}
.side .fab{position:absolute}
.side{position:relative}

/* chat */
.msgs{flex:1;overflow-y:auto;padding:16px 16px 8px;display:flex;flex-direction:column;gap:2px}
.day{align-self:center;font-size:12px;color:var(--muted);margin:16px 0 8px}
.b{max-width:min(75%,560px);padding:10px 16px;border-radius:20px;white-space:pre-wrap;word-wrap:break-word;font-size:15px;line-height:1.6}
/* راست‌چین: پیام‌های من سمت راست، پیام‌های دریافتی سمت چپ */
.b.out{align-self:flex-start;background:var(--out);color:var(--on-out)}
.b.in{align-self:flex-end;background:var(--in);color:var(--on-in)}
.b.out + .b.out{border-start-start-radius:6px}
.b.in + .b.in{border-start-end-radius:6px}
.dialog-wrap{position:fixed;inset:0;background:rgba(0,0,0,.4);display:grid;place-items:center;z-index:30;padding:16px}
.dialog{background:var(--surface);color:var(--text);border-radius:28px;padding:24px;width:100%;max-width:400px}
.dialog h3{margin:0 0 16px;font-size:20px;font-weight:500}
.set-row{margin-bottom:16px}
.set-row label{display:block;font-size:14px;color:var(--muted);margin-bottom:6px}
.set-ctl{display:flex;gap:8px;align-items:center}
.set-ctl select{flex:1;font:inherit;color:var(--text);background:var(--in);border:0;border-radius:12px;padding:12px}
.dialog .hint{font-size:12px;color:var(--muted);line-height:1.8}
.blocked-bar{display:flex;align-items:center;gap:8px;margin:0 16px;padding:10px 14px;border-radius:12px;background:rgba(217,48,37,.1);color:#d93025;font-size:13px}
.blocked-bar .icon{font-size:18px}
.bl-list{max-height:60vh;overflow-y:auto}
.bl-row{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.bl-row:last-child{border-bottom:0}
.chip-btn{border:1px solid var(--line);border-radius:16px;padding:6px 12px;font-size:13px;color:var(--primary);flex-shrink:0}
.chip-btn:hover{background:var(--hover)}
.call-log{align-self:center;display:flex;align-items:center;gap:6px;font-size:13px;color:var(--muted);background:var(--hover);border:1px solid var(--line);border-radius:16px;padding:6px 14px;margin:8px 0}
.call-log .icon{font-size:18px;color:#188038}
.meta{font-size:11px;color:var(--muted);margin:2px 8px 8px;display:flex;align-items:center;gap:4px}
.meta.out{align-self:flex-start}.meta.in{align-self:flex-end}
.meta .icon{font-size:14px}
.compose{display:flex;align-items:flex-end;gap:8px;padding:8px 16px 16px}
.compose .field{flex:1;background:var(--in);border-radius:24px;padding:12px 20px;display:flex}
.compose textarea{flex:1;border:0;background:transparent;font:inherit;color:var(--text);resize:none;outline:none;max-height:140px;line-height:1.5}
.send{width:48px;height:48px;border-radius:50%;background:var(--primary);color:var(--on-primary);display:grid;place-items:center;flex-shrink:0}
.send:disabled{opacity:.4}
.send .icon{transform:scaleX(-1)}
.empty{flex:1;display:grid;place-items:center;color:var(--muted);text-align:center;padding:24px}
.empty .icon{font-size:64px;opacity:.5}
.newto{padding:0 16px 8px}
.newto input{width:100%;padding:12px 16px;border:1px solid var(--line);border-radius:12px;background:transparent;color:var(--text);font:inherit;direction:ltr;text-align:right}
.sugg{max-height:240px;overflow:auto}
.menu{position:absolute;top:56px;left:16px;background:var(--surface);border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,.2);padding:8px 0;z-index:10;min-width:200px}
.menu button,.menu label{display:flex;gap:12px;align-items:center;width:100%;padding:10px 16px;text-align:start;cursor:pointer;font-size:14px}
.menu button:hover,.menu label:hover{background:var(--hover)}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#323232;color:#fff;padding:12px 20px;border-radius:8px;font-size:14px;z-index:20}
.back{display:none}

@media (max-width:760px){
  .side{width:100%;border:0}
  .main{display:none}
  .app.chat-open .side{display:none}
  .app.chat-open .main{display:flex}
  .back{display:grid}
}