:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --line: #d9dee7;
  --text: #172033;
  --muted: #667085;
  --blue: #2563eb;
  --green: #15803d;
  --yellow: #b7791f;
  --red: #c2410c;
  --nav: #111827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 244px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: var(--nav);
  color: #f8fafc;
  padding: 22px 16px;
}

.side-brand,
.brand-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.side-brand {
  margin-bottom: 24px;
}

.side-brand span,
.brand-row p {
  display: block;
  margin: 2px 0 0;
  color: #9ca3af;
  font-size: 13px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 8px;
  background: #ffffff;
  color: #111827;
  font-weight: 800;
}

.nav-list {
  display: grid;
  gap: 4px;
}

.nav-list a {
  color: #cbd5e1;
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
}

.nav-list a.active,
.nav-list a:hover {
  background: #273449;
  color: #ffffff;
}

.main-panel {
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.topbar h1 {
  margin: 4px 0 0;
  font-size: 24px;
  letter-spacing: 0;
}

.eyebrow {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-pill,
.user-pill,
.ghost-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  padding: 8px 10px;
  color: var(--text);
}

.status-pill.normal {
  color: var(--green);
  border-color: #bbf7d0;
  background: #f0fdf4;
}

.status-pill.warning {
  color: var(--yellow);
  border-color: #fde68a;
  background: #fffbeb;
}

.status-pill.critical {
  color: var(--red);
  border-color: #fed7aa;
  background: #fff7ed;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.metric-card,
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.metric-card {
  padding: 16px;
  min-height: 110px;
}

.metric-card span,
.metric-card small {
  color: var(--muted);
  font-size: 13px;
}

.metric-card strong {
  display: block;
  margin: 10px 0 8px;
  font-size: 26px;
  letter-spacing: 0;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(320px, 0.8fr);
  gap: 16px;
  margin-bottom: 16px;
}

.panel {
  padding: 16px;
}

.panel.wide {
  grid-row: span 2;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: start;
  margin-bottom: 12px;
}

.panel h2 {
  margin: 0;
  font-size: 17px;
}

.panel p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

canvas {
  display: block;
  width: 100%;
  max-height: 280px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.detail-list {
  display: grid;
  gap: 9px;
}

.detail-list div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid #eef1f5;
  padding-bottom: 8px;
  font-size: 14px;
}

.detail-list span {
  color: var(--muted);
}

.detail-list strong {
  text-align: right;
  font-weight: 650;
  overflow-wrap: anywhere;
}

.alert-list {
  display: grid;
  gap: 10px;
}

.alert-item {
  border-left: 3px solid var(--blue);
  padding: 8px 10px;
  background: #f8fafc;
  border-radius: 6px;
}

.alert-item strong,
.alert-item span,
.alert-item small {
  display: block;
}

.alert-item span,
.alert-item small {
  color: var(--muted);
  margin-top: 3px;
  font-size: 13px;
}

.table-panel {
  padding: 0;
  overflow: hidden;
}

.table-panel .panel-head {
  padding: 16px 16px 0;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  text-align: left;
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  white-space: nowrap;
}

th {
  color: var(--muted);
  font-weight: 650;
  background: #f8fafc;
}

.ok-text {
  color: var(--green);
}

.bad-text {
  color: var(--red);
}

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #eef2f6;
}

.login-shell {
  width: min(460px, calc(100vw - 32px));
}

.login-panel {
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 26px;
  box-shadow: 0 18px 50px rgba(17, 24, 39, 0.08);
}

.brand-row {
  margin-bottom: 24px;
}

.brand-row h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0;
}

.login-form {
  display: grid;
  gap: 14px;
}

.login-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

.login-form input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  color: var(--text);
  background: #ffffff;
}

.login-form input:focus {
  outline: 3px solid rgba(37, 99, 235, 0.15);
  border-color: var(--blue);
}

.login-form button {
  border: 0;
  border-radius: 8px;
  padding: 12px 14px;
  background: var(--blue);
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
}

.form-message {
  min-height: 20px;
  margin: 0;
  color: var(--muted);
}

.form-message.error {
  color: var(--red);
}

@media (max-width: 980px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .nav-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .metric-grid,
  .content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  .main-panel {
    padding: 14px;
  }

  .topbar,
  .top-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .nav-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .metric-card strong {
    font-size: 22px;
  }
}