:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --border: #e2e4e9;
  --text: #1c1e21;
  --text-muted: #6b7280;
  --primary: #1d4ed8;
  --primary-dark: #1e3a8a;
  --danger: #dc2626;
  --success: #16a34a;
  --warning: #d97706;
  --radius: 8px;
  --sidebar-w: 220px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: #14171f;
  color: #d7dae0;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; bottom: 0; left: 0;
}
.sidebar .brand {
  font-weight: 700;
  font-size: 18px;
  padding: 20px 18px;
  color: #fff;
  border-bottom: 1px solid #262b38;
}
.sidebar nav { flex: 1; padding: 10px 0; display: flex; flex-direction: column; }
.sidebar nav a {
  color: #b7bcc8;
  text-decoration: none;
  padding: 10px 18px;
  font-size: 13.5px;
  border-left: 3px solid transparent;
}
.sidebar nav a:hover { background: #1c2029; color: #fff; }
.sidebar-user {
  padding: 14px 18px;
  border-top: 1px solid #262b38;
  font-size: 12.5px;
}
.sidebar-user .role-badge {
  display: inline-block;
  background: #262b38;
  color: #9ca3af;
  border-radius: 4px;
  padding: 1px 6px;
  margin: 4px 0 8px;
  text-transform: capitalize;
}
.sidebar-user a { color: #93c5fd; text-decoration: none; font-size: 12.5px; }

.content {
  margin-left: var(--sidebar-w);
  padding: 24px 28px;
  flex: 1;
  max-width: 1400px;
}

h1 { font-size: 20px; margin: 0 0 4px; }
h2 { font-size: 16px; margin: 0 0 12px; }
.page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.subtitle { color: var(--text-muted); font-size: 13px; margin-bottom: 20px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 18px;
}

table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: .03em; }
tr:hover td { background: #fafbfc; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }

.btn {
  display: inline-block;
  padding: 8px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  font-size: 13.5px;
  cursor: pointer;
  font-weight: 500;
}
.btn:hover { background: #f2f3f5; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { color: var(--danger); }
.btn-sm { padding: 4px 10px; font-size: 12.5px; }

label { display: block; font-size: 12.5px; color: var(--text-muted); margin-bottom: 4px; font-weight: 600; }
input, select, textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13.5px;
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; border-color: var(--primary); }
.field { margin-bottom: 14px; }
.field-row { display: flex; gap: 14px; }
.field-row .field { flex: 1; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 11.5px; font-weight: 600; }
.badge-low { background: #fee2e2; color: var(--danger); }
.badge-ok { background: #dcfce7; color: var(--success); }

.flash { padding: 10px 14px; border-radius: var(--radius); margin-bottom: 16px; font-size: 13.5px; }
.flash-success { background: #dcfce7; color: #166534; }
.flash-error { background: #fee2e2; color: #991b1b; }

.login-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(160deg, #14171f, #1d4ed8);
}
.login-card {
  background: #fff;
  padding: 36px 32px;
  border-radius: 12px;
  width: 340px;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.login-card h1 { font-size: 18px; margin-bottom: 2px; }
.login-card .subtitle { margin-bottom: 22px; }