:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --ink: #111318;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #111318;
  --soft: #f0f2f5;
  --danger: #b42318;
  --ok: #027a48;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif; background: var(--bg); color: var(--ink); }
a { color: inherit; text-decoration: none; }
.layout { display: grid; grid-template-columns: 240px minmax(0, 1fr); min-height: 100vh; }
.sidebar { background: #111318; color: #fff; padding: 24px 18px; }
.brand { display: flex; gap: 10px; align-items: center; margin-bottom: 28px; }
.brand-logo { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; background: #fff; color: #111318; font-weight: 800; }
.brand strong { display: block; }
.brand span { color: #a7adb8; font-size: 12px; }
.nav { display: grid; gap: 6px; }
.nav a { color: #d6d9df; padding: 11px 12px; border-radius: 10px; font-size: 14px; }
.nav a:hover, .nav a.active { background: rgba(255,255,255,.1); color: #fff; }
.main { padding: 32px; }
.header { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 24px; }
h1 { margin: 0; font-size: 28px; letter-spacing: -0.03em; }
.sub { color: var(--muted); margin-top: 6px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 20px; box-shadow: 0 8px 28px rgba(15, 23, 42, .04); }
.grid { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stat { font-size: 34px; font-weight: 800; letter-spacing: -0.04em; }
.label { color: var(--muted); font-size: 13px; }
.btn { border: 0; background: var(--primary); color: #fff; padding: 10px 14px; border-radius: 10px; cursor: pointer; font-weight: 700; }
.btn.secondary { background: var(--soft); color: var(--ink); }
.btn.danger { background: var(--danger); }
.btn:disabled { opacity: .6; cursor: not-allowed; }
input, textarea, select { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 11px 12px; font: inherit; background: #fff; }
textarea { min-height: 150px; resize: vertical; }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
.actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { border-bottom: 1px solid var(--line); padding: 12px 8px; text-align: left; vertical-align: top; font-size: 14px; }
.table th { color: var(--muted); font-weight: 700; }
.badge { display: inline-flex; align-items: center; background: var(--soft); border-radius: 999px; padding: 4px 8px; font-size: 12px; color: #374151; }
.muted { color: var(--muted); }
.notice { padding: 12px 14px; border-radius: 12px; background: #eef4ff; color: #173b78; margin-bottom: 16px; }
.error { background: #fff1f0; color: var(--danger); }
.success { background: #ecfdf3; color: var(--ok); }
.login-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-box { width: min(420px, 100%); }
.chat-box { height: 430px; overflow: auto; background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 16px; margin-bottom: 14px; }
.msg { padding: 10px 12px; border-radius: 12px; max-width: 85%; margin-bottom: 10px; white-space: pre-wrap; line-height: 1.5; }
.msg.user { margin-left: auto; background: #111318; color: #fff; }
.msg.bot { background: #f2f4f7; }
pre { white-space: pre-wrap; background: #0b1020; color: #d9e5ff; padding: 14px; border-radius: 12px; overflow: auto; }
@media (max-width: 820px) { .layout { grid-template-columns: 1fr; } .sidebar { position: static; } .grid-3, .form-grid { grid-template-columns: 1fr; } .main { padding: 20px; } }