:root{
  --green:#1D9E75;
  --green-d:#158060;
  --ink:#0f172a;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#f6f8fa;
  --card:#ffffff;
  --danger:#dc2626;
}
*{box-sizing:border-box}
body{
  margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.5;
}
a{color:var(--green);text-decoration:none}
a:hover{text-decoration:underline}

/* Topbar */
.topbar{
  display:flex;align-items:center;gap:24px;
  background:#0f172a;color:#fff;padding:0 20px;height:58px;
}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:16px;letter-spacing:.2px}
.logo-dot{width:12px;height:12px;border-radius:3px;background:var(--green);display:inline-block}
.mainnav{display:flex;gap:4px;margin-left:8px;flex:1}
.mainnav a{color:#cbd5e1;padding:8px 14px;border-radius:7px;font-size:14px;font-weight:500}
.mainnav a:hover{background:#1e293b;color:#fff;text-decoration:none}
.mainnav a.active{background:var(--green);color:#fff}
.usermenu{display:flex;align-items:center;gap:12px}
.uname{color:#94a3b8;font-size:13px;max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* Layout */
.wrap{max-width:960px;margin:28px auto;padding:0 18px}
.foot{text-align:center;color:var(--muted);font-size:12px;padding:28px 0}

/* Cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px;margin-bottom:20px}
.card h2{margin:0 0 4px;font-size:18px}
.card .sub{color:var(--muted);font-size:13px;margin:0 0 18px}

/* Grid of stat/nav cards */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px}
.tile{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;display:block}
.tile:hover{border-color:var(--green);text-decoration:none;box-shadow:0 4px 14px rgba(15,23,42,.06)}
.tile .t-ico{font-size:22px}
.tile .t-title{font-weight:700;margin:8px 0 2px;color:var(--ink)}
.tile .t-desc{color:var(--muted);font-size:13px}

/* Forms */
label{display:block;font-weight:600;font-size:13px;margin:14px 0 5px}
input[type=text],input[type=email],input[type=password],select,textarea{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;
  font-size:14px;font-family:inherit;background:#fff;color:var(--ink);
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px rgba(29,158,117,.15)}
textarea{resize:vertical;min-height:90px}
.hint{color:var(--muted);font-size:12px;margin-top:5px}

.btn{
  display:inline-block;background:var(--green);color:#fff;border:none;
  padding:10px 18px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;
}
.btn:hover{background:var(--green-d);text-decoration:none;color:#fff}
.btn-ghost{
  display:inline-block;background:transparent;border:1px solid #334155;color:#cbd5e1;
  padding:6px 12px;border-radius:7px;font-size:13px;cursor:pointer
}
.btn-ghost:hover{background:#1e293b;color:#fff;text-decoration:none}
.btn-danger{background:var(--danger)}
.btn-danger:hover{background:#b91c1c}
.btn-sm{padding:6px 12px;font-size:13px}
.row{display:flex;gap:14px;flex-wrap:wrap}
.row>*{flex:1;min-width:180px}

/* Auth pages */
.auth-wrap{max-width:400px;margin:60px auto;padding:0 18px}
.auth-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:30px}
.auth-logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:20px;margin-bottom:6px}
.auth-sub{color:var(--muted);font-size:13px;margin-bottom:20px}
.auth-alt{text-align:center;margin-top:16px;font-size:14px;color:var(--muted)}

/* Flash */
.flash{padding:12px 16px;border-radius:9px;margin-bottom:16px;font-size:14px;border:1px solid}
.flash-info{background:#eff6ff;border-color:#bfdbfe;color:#1e40af}
.flash-success{background:#f0fdf4;border-color:#bbf7d0;color:#166534}
.flash-error{background:#fef2f2;border-color:#fecaca;color:#991b1b}

/* KB list */
.kb-item{border:1px solid var(--line);border-radius:10px;padding:14px 16px;margin-bottom:12px;display:flex;justify-content:space-between;gap:14px;align-items:flex-start}
.kb-item .kb-title{font-weight:700;margin-bottom:3px}
.kb-item .kb-body{color:var(--muted);font-size:13px;white-space:pre-wrap}
.empty{color:var(--muted);font-size:14px;text-align:center;padding:28px}

/* Badge */
.badge{display:inline-block;background:#ecfdf5;color:var(--green-d);border:1px solid #a7f3d0;padding:2px 9px;border-radius:999px;font-size:12px;font-weight:600}
.badge-off{background:#fef2f2;color:#b91c1c;border-color:#fecaca}

/* Playground chat */
.chat{border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden}
.chat-log{height:400px;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:12px;background:#f8fafc}
.msg{max-width:78%;padding:10px 14px;border-radius:12px;font-size:14px;white-space:pre-wrap;line-height:1.45}
.msg.user{align-self:flex-end;background:var(--green);color:#fff;border-bottom-right-radius:3px}
.msg.bot{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:3px}
.msg.sys{align-self:center;background:#f1f5f9;color:var(--muted);font-size:12px;border-radius:8px}
.chat-input{display:flex;gap:10px;padding:14px;border-top:1px solid var(--line)}
.chat-input input{flex:1}
.typing{align-self:flex-start;color:var(--muted);font-size:13px;font-style:italic}

@media(max-width:640px){
  .topbar{flex-wrap:wrap;height:auto;padding:10px 14px;gap:10px}
  .mainnav{order:3;width:100%;overflow-x:auto}
  .uname{display:none}
}