:root {
  --isens-navy: #2c3f8f;
  --isens-teal: #2ea8ac;
  --isens-gradient: linear-gradient(135deg, #2c3f8f 0%, #2ea8ac 100%);
  --bg: #f4f7fb;
  --card-bg: #ffffff;
  --border: #e3e8f0;
  --text: #1f2937;
  --muted: #6b7280;
  --ok: #1aa971;
  --bad: #d64545;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

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

.sidebar {
  width: 240px;
  background: var(--isens-gradient);
  color: #fff;
  display: flex;
  flex-direction: column;
  padding: 24px 16px;
  flex-shrink: 0;
}

.brand { padding: 0 4px 24px 4px; }
.brand-logo { width: 100%; max-width: 180px; filter: brightness(0) invert(1); }

.sidebar nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.sidebar nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.sidebar nav a .ic { font-size: 10px; opacity: 0.8; }
.sidebar nav a:hover { background: rgba(255,255,255,0.12); }
.sidebar nav a.active { background: rgba(255,255,255,0.22); font-weight: 600; }

.sidebar-footer { border-top: 1px solid rgba(255,255,255,0.2); padding-top: 12px; }
.user-tag { font-size: 12px; opacity: 0.8; margin-bottom: 6px; }
.logout-link { color: #fff; text-decoration: none; font-size: 13px; opacity: 0.9; }

.content { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { background: #fff; border-bottom: 1px solid var(--border); padding: 18px 32px; }
.topbar h1 { margin: 0; font-size: 20px; color: var(--isens-navy); }
.page-body { padding: 24px 32px; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; }
.flash-success { background: #e6f7ef; color: var(--ok); border: 1px solid #b7ecd3; }
.flash-error { background: #fdecec; color: var(--bad); border: 1px solid #f6c4c4; }

.status-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-bottom: 24px; }
.status-card { background: var(--card-bg); border: 1px solid var(--border); border-left: 4px solid var(--muted); border-radius: 10px; padding: 16px; }
.status-card.ok { border-left-color: var(--ok); }
.status-card.bad { border-left-color: var(--bad); }
.status-card.neutral { border-left-color: var(--isens-teal); }
.status-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.status-value { font-size: 22px; font-weight: 700; margin: 4px 0; }
.status-sub { font-size: 12px; color: var(--muted); }

.panel-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.panel { background: var(--card-bg); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 16px; }
.panel h2 { margin-top: 0; font-size: 15px; color: var(--isens-navy); }
.sub-heading { font-size: 13px; color: var(--isens-navy); margin: 20px 0 10px 0; border-top: 1px solid var(--border); padding-top: 16px; }

.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th { text-align: left; font-size: 11px; text-transform: uppercase; color: var(--muted); padding: 8px 6px; border-bottom: 2px solid var(--border); }
.data-table td { padding: 10px 6px; border-bottom: 1px solid var(--border); vertical-align: top; }
.data-table.wide td, .data-table.wide th { padding: 10px 8px; }

.kv { display: inline-block; background: #f1f4f9; border-radius: 6px; padding: 2px 8px; margin: 2px 4px 2px 0; font-size: 12px; }

.badge { padding: 3px 9px; border-radius: 20px; font-size: 11px; font-weight: 700; letter-spacing: .02em; }
.badge-serial { background: #e8ecfb; color: var(--isens-navy); }
.badge-tcp { background: #e2f6f4; color: #12736f; }

.dot { display: inline-block; width: 9px; height: 9px; border-radius: 50%; margin-right: 4px; }
.dot-ok { background: var(--ok); }
.dot-bad { background: var(--bad); }

.muted { color: var(--muted); font-size: 13px; }
.muted.small { font-size: 11px; }

.form-row { margin-bottom: 14px; display: flex; flex-direction: column; gap: 6px; }
.form-row label { font-size: 12px; color: var(--muted); font-weight: 600; }
.form-row input, .form-row select {
  padding: 9px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; background: #fff;
}
.form-row input:focus, .form-row select:focus { outline: 2px solid var(--isens-teal); border-color: var(--isens-teal); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
.filter-form .form-grid { grid-template-columns: repeat(3, 1fr); }

.primary-btn, .secondary-btn, .link-btn {
  border: none; padding: 10px 20px; border-radius: 8px; font-size: 13px; font-weight: 600; cursor: pointer;
}
.primary-btn { background: var(--isens-gradient); color: #fff; }
.secondary-btn { background: #eef1f6; color: var(--isens-navy); }
.link-btn { background: none; color: var(--isens-navy); padding: 4px 8px; text-decoration: underline; font-size: 12px; }
.link-btn.danger { color: var(--bad); }
.primary-btn:hover, .secondary-btn:hover { opacity: 0.9; }
.inline { display: inline; }
.inline-form { margin-top: 6px; }

.login-body {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--isens-gradient); margin: 0;
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.login-card { background: #fff; border-radius: 14px; padding: 36px 32px; width: 360px; text-align: center; box-shadow: 0 20px 50px rgba(0,0,0,0.2); }
.login-logo { max-width: 200px; margin-bottom: 8px; }
.login-subtitle { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.login-card form { display: flex; flex-direction: column; gap: 10px; text-align: left; }
.login-card label { font-size: 12px; color: var(--muted); font-weight: 600; }
.login-card input { padding: 10px; border-radius: 6px; border: 1px solid var(--border); font-size: 14px; }
.login-card button {
  margin-top: 6px; background: var(--isens-gradient); color: #fff; border: none;
  padding: 11px; border-radius: 8px; font-weight: 600; cursor: pointer;
}
.login-hint { font-size: 11px; color: var(--muted); margin-top: 16px; }

@media (max-width: 900px) {
  .status-row, .panel-row, .form-grid, .filter-form .form-grid { grid-template-columns: 1fr; }
  .sidebar { width: 190px; }
}