:root{
  --bg:#f4f5f9; --panel:#ffffff; --ink:#151823; --muted:#6b7280; --line:#e5e7ef;
  --brand:#4f46e5; --brand-soft:#eef0ff; --accent:#0ea5e9;
  --ok:#12805c; --ok-soft:#e6f5ef; --warn:#b45309; --warn-soft:#fef3c7; --danger:#be123c; --danger-soft:#ffe4e9;
  --sidebar:#161a2e; --sidebar-ink:#c3c7d9; --sidebar-active:#242a48;
  --radius:12px; --shadow:0 1px 2px rgba(16,20,40,.06),0 8px 24px rgba(16,20,40,.06);
  --mono:ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Noto Sans Bengali",Helvetica,Arial,sans-serif}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1{font-size:24px;margin:0 0 4px}
h2{font-size:17px;margin:0 0 12px}
h3{font-size:15px;margin:0 0 8px}
.sub{color:var(--muted);font-size:14px;margin:0 0 22px}

/* shell */
.shell{display:flex;min-height:100vh}
.side{width:236px;flex:0 0 236px;background:var(--sidebar);color:var(--sidebar-ink);display:flex;flex-direction:column;position:sticky;top:0;height:100vh}
.side .brand{display:flex;align-items:center;gap:9px;padding:20px 18px;color:#fff;font-weight:700;font-size:17px;letter-spacing:.2px}
.side .brand .dot{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--accent));display:grid;place-items:center;font-size:14px}
.side .who{padding:0 18px 14px;font-size:12px;color:#8b90ab;border-bottom:1px solid #262c4a;margin-bottom:10px}
.side .who b{display:block;color:#e8eaf5;font-size:13px;font-weight:600}
.side .group{padding:14px 18px 6px;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#6e738f}
.side nav a{display:flex;align-items:center;gap:10px;padding:9px 18px;color:var(--sidebar-ink);font-size:14px}
.side nav a:hover{background:#1d2238;color:#fff;text-decoration:none}
.side nav a.on{background:var(--sidebar-active);color:#fff;box-shadow:inset 3px 0 0 var(--brand)}
.side .foot{margin-top:auto;padding:14px 18px;border-top:1px solid #262c4a;font-size:13px}
.side .foot a{color:#9aa0bd}
.main{flex:1;min-width:0;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 26px;background:var(--panel);border-bottom:1px solid var(--line)}
.topbar .wallet{display:flex;align-items:center;gap:8px;background:var(--brand-soft);color:#3730a3;border-radius:999px;padding:6px 14px;font-size:13px;font-weight:600}
.content{padding:24px 26px 60px;max-width:1180px;width:100%}

/* cards + tables */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);margin-bottom:18px}
.card.tight{padding:14px 16px}
.grid{display:grid;gap:16px}
.grid.k4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}
.grid.k3{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid.k2{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
.stat .label{font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--muted)}
.stat .value{font-size:27px;font-weight:700;margin-top:6px;letter-spacing:-.5px}
.stat .hint{font-size:12px;color:var(--muted);margin-top:2px}
table{width:100%;border-collapse:collapse;font-size:14px}
th{text-align:left;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:8px 10px;border-bottom:1px solid var(--line)}
td{padding:11px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
tr:last-child td{border-bottom:0}
.mono{font-family:var(--mono);font-size:12.5px}

/* forms */
label{display:block;font-size:13px;font-weight:600;margin:0 0 5px}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=url],select,textarea{
  width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:9px;font:inherit;background:#fff;color:inherit}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brand-soft);border-color:var(--brand)}
textarea{min-height:96px;resize:vertical}
.field{margin-bottom:14px}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row>*{flex:1;min-width:180px}
.help{font-size:12px;color:var(--muted);margin-top:4px}
.btn{display:inline-flex;align-items:center;gap:7px;padding:9px 15px;border-radius:9px;border:1px solid transparent;background:var(--brand);color:#fff;font:inherit;font-weight:600;font-size:14px;cursor:pointer}
.btn:hover{filter:brightness(1.07);text-decoration:none}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.danger{background:var(--danger)}
.btn.sm{padding:5px 10px;font-size:13px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* misc */
.pill{display:inline-block;padding:3px 9px;border-radius:999px;font-size:12px;font-weight:600}
.pill.ai{background:var(--brand-soft);color:#3730a3}
.pill.human{background:var(--ok-soft);color:var(--ok)}
.pill.pending{background:var(--warn-soft);color:var(--warn)}
.pill.resolved{background:#eef0f4;color:var(--muted)}
.pill.on{background:var(--ok-soft);color:var(--ok)}
.pill.off{background:var(--danger-soft);color:var(--danger)}
.flash{padding:11px 15px;border-radius:10px;margin-bottom:16px;font-size:14px}
.flash.ok{background:var(--ok-soft);color:var(--ok)}
.flash.err{background:var(--danger-soft);color:var(--danger)}
.empty{text-align:center;color:var(--muted);padding:38px 10px}
.spark{display:flex;align-items:flex-end;gap:3px;height:80px;margin-top:10px}
.spark i{flex:1;background:linear-gradient(180deg,var(--brand),#8b8bf0);border-radius:3px 3px 0 0;min-height:2px;display:block}
.split{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px}

/* inbox */
.inbox{display:grid;grid-template-columns:330px 1fr;gap:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);height:calc(100vh - 150px)}
.inbox .list{border-right:1px solid var(--line);overflow-y:auto}
.inbox .filters{display:flex;gap:6px;padding:12px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.inbox .filters a{font-size:12.5px;padding:4px 10px;border-radius:999px;background:#f1f2f7;color:var(--muted)}
.inbox .filters a.on{background:var(--brand);color:#fff}
.conv{display:block;padding:12px 14px;border-bottom:1px solid var(--line);cursor:pointer;color:inherit}
.conv:hover{background:#fafbff;text-decoration:none}
.conv.on{background:var(--brand-soft)}
.conv .n{display:flex;justify-content:space-between;gap:8px;font-weight:600;font-size:14px}
.conv .p{color:var(--muted);font-size:13px;margin-top:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conv .m{display:flex;gap:6px;align-items:center;margin-top:6px;font-size:11px;color:var(--muted)}
.thread{display:flex;flex-direction:column;min-width:0}
.thread .head{padding:13px 18px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:10px}
.thread .body{flex:1;overflow-y:auto;padding:18px;background:#fbfbfe}
.thread .composer{border-top:1px solid var(--line);padding:12px;display:flex;gap:8px;align-items:flex-end}
.bubble{max-width:74%;margin-bottom:12px;padding:9px 13px;border-radius:14px;font-size:14px;line-height:1.5;white-space:pre-wrap;word-break:break-word}
.bubble.in{background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px}
.bubble.out{background:var(--brand);color:#fff;margin-left:auto;border-bottom-right-radius:4px}
.bubble.out.ai{background:#312e81}
.bubble.sys{background:var(--warn-soft);color:var(--warn);margin:0 auto 12px;text-align:center;font-size:13px;max-width:80%}
.bubble .who{font-size:11px;opacity:.7;margin-bottom:3px}
.bubble img{max-width:240px;border-radius:9px;display:block;margin-top:6px}
.bubble audio{margin-top:6px;max-width:240px}
.code{background:#0f1222;color:#d5d9f0;border-radius:10px;padding:12px 14px;font-family:var(--mono);font-size:12.5px;overflow-x:auto;white-space:pre-wrap;word-break:break-all}

@media(max-width:900px){
  .shell{flex-direction:column}
  .side{width:100%;height:auto;position:static;flex:none}
  .inbox{grid-template-columns:1fr;height:auto}
}