:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --ink: #182230;
  --muted: #64748b;
  --line: #d9e0ea;
  --brand: #ff5b00;
  --brand-dark: #c84400;
  --ok: #0f7b52;
  --warn: #9a6700;
  --danger: #b42318;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(135deg, #f8fafc 0%, #eef3f8 100%);
}
a { color: var(--brand-dark); }
.shell { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }
.sidebar { background: #101928; color: #e6edf7; padding: 28px 22px; }
.brand { font-size: 22px; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 28px; }
.brand span { color: var(--brand); }
.nav a { display: block; color: #dbe4f0; text-decoration: none; padding: 11px 12px; border-radius: 10px; margin-bottom: 6px; }
.nav a:hover, .nav a.active { background: rgba(255,255,255,0.08); color: #fff; }
.main { padding: 28px; }
.topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; padding: 22px; box-shadow: 0 18px 50px rgba(15, 23, 42, 0.06); }
.grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-bottom: 20px; }
.metric { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.metric strong { display: block; font-size: 30px; margin-top: 8px; color: var(--brand-dark); }
.muted { color: var(--muted); }
.btn { border: 0; border-radius: 10px; background: var(--brand); color: #fff; padding: 10px 14px; font-weight: 700; cursor: pointer; text-decoration: none; display: inline-block; }
.btn.secondary { background: #e7edf5; color: var(--ink); }
.btn.danger { background: var(--danger); }
.btn.small { padding: 7px 10px; font-size: 14px; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}
label { display: block; font-weight: 700; margin: 14px 0 7px; }
.login-wrap { max-width: 440px; margin: 8vh auto; padding: 0 18px; }
.login-card { background: #fff; border-radius: 20px; border: 1px solid var(--line); padding: 28px; box-shadow: 0 24px 70px rgba(15, 23, 42, 0.12); }
.alert { border-radius: 12px; padding: 12px 14px; margin-bottom: 16px; background: #fff4ed; color: #9a3412; border: 1px solid #fed7aa; }
.alert.success { background: #ecfdf3; color: var(--ok); border-color: #bbf7d0; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; border-bottom: 1px solid var(--line); padding: 12px 10px; vertical-align: top; }
th { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .04em; }
.badge { display: inline-flex; padding: 4px 9px; border-radius: 999px; font-size: 12px; font-weight: 800; background: #eef2ff; color: #3730a3; }
.badge.ok { background: #dcfce7; color: var(--ok); }
.badge.warn { background: #fef3c7; color: var(--warn); }
.badge.danger { background: #fee4e2; color: var(--danger); }
.article-layout { display: grid; grid-template-columns: 1.4fr .8fr; gap: 20px; }
.kv { display: grid; grid-template-columns: 180px 1fr; border-bottom: 1px solid var(--line); padding: 9px 0; }
.kv span:first-child { color: var(--muted); }
.pre { white-space: pre-wrap; background: #f8fafc; border: 1px solid var(--line); padding: 14px; border-radius: 12px; overflow: auto; }
.chat { display: grid; gap: 12px; margin: 18px 0; }
.chat-message { border: 1px solid var(--line); border-radius: 16px; padding: 14px 16px; background: #f8fafc; }
.chat-message.user { background: #fff7ed; border-color: #fed7aa; }
.chat-message.assistant { background: #f1f5f9; }
.chat-message strong { display: block; margin-bottom: 7px; }
button:disabled { opacity: .55; cursor: not-allowed; }
@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .grid, .article-layout { grid-template-columns: 1fr; }
}