:root{
  --bg:#0b1020;
  --bg-soft:#111833;
  --surface:#ffffff;
  --surface-2:#f7f9ff;
  --surface-3:#eef3ff;
  --primary:#4f7cff;
  --primary-2:#3b63e6;
  --primary-3:#7aa2ff;
  --accent:#22c55e;
  --text:#0f172a;
  --text-soft:#334155;
  --muted:#64748b;
  --border:#dbe4f5;
  --border-soft:#e8eefb;
  --danger:#ef4444;
  --ok:#16a34a;
  --shadow:0 10px 30px rgba(15,23,42,.08);
  --shadow-lg:0 20px 50px rgba(15,23,42,.14);
  --radius:16px;
  --radius-sm:12px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font:14px/1.65 "Inter",system-ui,-apple-system,Segoe UI,Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(79,124,255,.22), transparent 60%),
    radial-gradient(900px 420px at 100% 0%, rgba(34,197,94,.12), transparent 55%),
    linear-gradient(180deg,#f6f8ff 0%,#eef3ff 100%);
  min-height:100vh;
}
a{color:var(--primary-2);text-decoration:none}a:hover{text-decoration:none;color:var(--primary)}
.container{max-width:1180px;margin:0 auto;padding:0 18px}

/* Topbar */
.topbar{
  position:sticky;top:0;z-index:20;
  background:rgba(255,255,255,.78);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid rgba(219,228,245,.8);
  box-shadow:0 4px 20px rgba(15,23,42,.04);
}
.topbar .inner{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 0}
.brand{
  display:inline-flex;align-items:center;gap:10px;
  font-weight:800;font-size:18px;color:var(--text);letter-spacing:.2px;
}
.brand::before{
  content:"";width:34px;height:34px;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),#7c5cff);
  box-shadow:0 8px 18px rgba(79,124,255,.28);
  flex:0 0 auto;
}
.nav{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:13px}
.nav .muted{color:var(--muted);padding:6px 2px}

/* Cards */
.card{
  background:rgba(255,255,255,.92);
  border:1px solid rgba(255,255,255,.7);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  overflow:hidden;
}
.card-hd{
  padding:15px 18px;
  border-bottom:1px solid var(--border-soft);
  font-weight:700;font-size:15px;
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  background:linear-gradient(180deg,rgba(255,255,255,.95),rgba(247,249,255,.75));
}
.card-bd{padding:18px}
.hero{
  padding:26px 22px;
  background:
    radial-gradient(600px 220px at 90% -20%, rgba(79,124,255,.18), transparent 60%),
    linear-gradient(135deg,#fff 0%,#f6f9ff 100%);
}
.hero h2{margin:0 0 8px;font-size:26px;line-height:1.25;letter-spacing:.2px}
.hero p{margin:0 0 14px;color:var(--text-soft)}
.hero .stats{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.stat-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;
  background:#fff;border:1px solid var(--border-soft);color:var(--text-soft);
  box-shadow:0 4px 12px rgba(15,23,42,.04);font-size:13px;
}
.stat-chip b{color:var(--text)}

/* Layout */
.grid2{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:16px;align-items:start}
@media (max-width:980px){.grid2{grid-template-columns:1fr}}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;margin:6px 0 16px}
.page-head h1{margin:0;font-size:24px}.page-head p{margin:4px 0 0;color:var(--muted)}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 16px;border-radius:12px;border:1px solid transparent;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));
  color:#fff;cursor:pointer;font:inherit;font-weight:600;
  box-shadow:0 8px 18px rgba(79,124,255,.22);
  transition:transform .12s ease, box-shadow .12s ease, filter .12s ease;
}
.btn:hover{filter:brightness(1.03);transform:translateY(-1px);text-decoration:none;color:#fff;box-shadow:0 12px 24px rgba(79,124,255,.26)}
.btn:active{transform:translateY(0)}
.btn.sec{
  background:#fff;color:var(--text-soft);border-color:var(--border);
  box-shadow:0 2px 8px rgba(15,23,42,.04);
}
.btn.sec:hover{color:var(--text);border-color:#c9d6f2;box-shadow:0 6px 14px rgba(15,23,42,.06)}
.btn.sm{padding:6px 11px;font-size:13px;border-radius:10px;box-shadow:none}
.btn.sm:hover{transform:none}
.btn.danger{background:#fff;color:var(--danger);border-color:#fecaca;box-shadow:none}
.btn.block{width:100%}

/* Forms */
input[type=text],input[type=password],input[type=number],textarea{
  width:100%;padding:11px 13px;
  border:1px solid var(--border);border-radius:12px;
  font:inherit;color:var(--text);background:#fff;
  transition:border-color .12s ease, box-shadow .12s ease;
}
input:focus,textarea:focus{
  outline:none;border-color:var(--primary-3);
  box-shadow:0 0 0 4px rgba(79,124,255,.14);
}
label{display:block;font-weight:650;margin:0 0 5px;color:var(--text-soft);font-size:13px}
.field{margin-bottom:13px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 14px}
@media (max-width:640px){.form-grid{grid-template-columns:1fr}}

/* Alerts & badges */
.alert{padding:12px 14px;border-radius:12px;margin:0 0 14px;border:1px solid;display:flex;gap:10px;align-items:flex-start}
.alert.err{background:#fff5f5;border-color:#fecaca;color:#991b1b}
.alert.ok{background:#f0fdf4;border-color:#bbf7d0;color:#166534}
.muted{color:var(--muted)} .small{font-size:12px}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:999px;
  background:linear-gradient(135deg,#eef3ff,#f4f7ff);color:#3558c7;
  font-size:12px;font-weight:600;border:1px solid #dbe6ff;
}
code{
  background:#f1f5ff;padding:2px 7px;border-radius:8px;
  color:#1e3a8a;font-size:.95em;border:1px solid #e3ebff;
}

/* Tables */
.tbl-wrap{overflow:auto;border:1px solid var(--border-soft);border-radius:12px;background:#fff}
table.tbl{width:100%;border-collapse:separate;border-spacing:0}
table.tbl th,table.tbl td{padding:11px 12px;border-bottom:1px solid var(--border-soft);text-align:left;vertical-align:top}
table.tbl th{
  background:linear-gradient(180deg,#fbfcff,#f4f7ff);
  font-size:12.5px;color:#475569;font-weight:700;
  position:sticky;top:0;z-index:1;
}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tbody tr:hover td{background:#fafcff}

/* Auth */
.auth-shell{
  min-height:calc(100vh - 40px);
  display:flex;align-items:center;justify-content:center;
  padding:28px 14px;
}
.auth-wrap{width:100%;max-width:480px;margin:0 auto;padding:0}
.auth-brand{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:16px;font-weight:800;font-size:20px;color:var(--text)}
.auth-brand::before{content:"";width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--primary),#7c5cff);box-shadow:0 10px 22px rgba(79,124,255,.26)}
.auth-card .card-bd{padding:22px}
.auth-meta{margin-top:14px;padding-top:14px;border-top:1px dashed var(--border);color:var(--muted);font-size:12.5px}

/* Chat */
.chat-shell .card-bd{padding:14px}
.chat-box{
  height:500px;overflow:auto;
  border:1px solid var(--border-soft);border-radius:14px;
  padding:14px;
  background:
    linear-gradient(180deg,#f9fbff 0%,#f4f7ff 100%);
}
.chat-box::-webkit-scrollbar{width:10px}
.chat-box::-webkit-scrollbar-thumb{background:#cdd9f2;border-radius:999px;border:2px solid #f4f7ff}
.msg{display:flex;flex-direction:column;align-items:flex-start;margin:0 0 12px;animation:msgIn .18s ease}
.msg.me{align-items:flex-end}
.msg .meta{
  font-size:11.5px;color:var(--muted);margin:0 4px 4px;
  max-width:min(92%,760px);
}
.msg .meta strong{color:var(--text-soft);font-weight:700}
.msg .bubble{
  display:inline-block;
  max-width:min(92%,760px);
  padding:10px 13px;border-radius:14px 14px 14px 6px;
  background:#fff;border:1px solid var(--border-soft);
  color:var(--text);word-break:break-word;white-space:pre-wrap;
  box-shadow:0 4px 14px rgba(15,23,42,.04);
}
.msg.me .bubble{
  border-radius:14px 14px 6px 14px;
  background:linear-gradient(135deg,var(--primary),#5f67ff);
  color:#fff;border-color:transparent;
  box-shadow:0 10px 22px rgba(79,124,255,.22);
}
.msg.me .meta{ text-align:right }
.msg.sys .bubble{background:#f1f5f9;color:var(--muted);border-style:dashed}
@keyframes msgIn{from{opacity:.2;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}

.chat-form{display:flex;gap:10px;margin-top:12px;align-items:flex-end}
.chat-form textarea{
  flex:1;min-height:58px;max-height:180px;resize:vertical;
  border-radius:14px;padding:12px 13px;
}
.chat-form .btn{height:48px;padding:0 20px;border-radius:14px}
.chat-hint{
  margin-top:8px;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;
  color:var(--muted);font-size:12px;
}
.info-list .row{padding:9px 0;border-bottom:1px dashed var(--border-soft)}
.info-list .row:last-child{border-bottom:0}
.info-list .k{color:var(--muted);font-size:12px;margin-bottom:2px}
.info-list .v{color:var(--text);font-weight:600;word-break:break-all}
.online-table table.tbl th,.online-table table.tbl td{padding:8px 9px;font-size:12.5px}

/* Footer */
.footer{padding:22px 0 26px;color:var(--muted);font-size:12px;text-align:center}
.footer .dot{margin:0 6px;color:#cbd5e1}

/* Utilities */
.mt-14{margin-top:14px}.mb-14{margin-bottom:14px}
.flex{display:flex;gap:10px;align-items:center;flex-wrap:wrap}

/* Chat tools / file upload */
.chat-tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px}
.file-btn{cursor:pointer;margin:0}
.file-card{min-width:220px}
.file-card .file-name{font-weight:700;margin-bottom:4px}
.file-card .file-meta{font-size:12px;color:var(--muted);margin-bottom:8px}
.msg.me .file-card .file-meta{color:rgba(255,255,255,.82)}
.msg.me .file-card .file-name{color:#fff}
.file-card.expired{opacity:.95}
.file-card.expired .file-meta{color:#b91c1c}
.msg.me .file-card.expired .file-meta{color:#ffe4e6}
.risk-hit, mark.risk-hit{background:#fef08a;color:#854d0e;padding:0 2px;border-radius:4px}
.msg .bubble a.btn{margin-top:2px}
.msg.me .bubble a.btn.sec{background:rgba(255,255,255,.18);border-color:rgba(255,255,255,.35);color:#fff}

/* Responsive nav */
@media (max-width:720px){
  .topbar .inner{flex-direction:column;align-items:flex-start}
  .chat-box{height:420px}
  .chat-form{flex-direction:column;align-items:stretch}
  .chat-form .btn{width:100%}
}