:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #6b7485;
  --line: #dde3ee;
  --primary: #1c6dd0;
  --primary-dark: #1253a2;
  --danger: #b42318;
  --success: #11805a;
  --warning-bg: #fff4df;
  --radius: 8px;
  --shadow: 0 10px 24px rgba(23, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 245px;
  background: #111827;
  color: #fff;
  padding: 22px 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

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

.brand .mark {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: var(--radius);
  background: var(--primary);
  font-weight: 800;
}

.brand small {
  display: block;
  color: #aeb8c8;
  margin-top: 2px;
}

nav {
  display: grid;
  gap: 6px;
}

nav a,
.logout button {
  width: 100%;
  border: 0;
  border-radius: var(--radius);
  padding: 11px 12px;
  color: #dce4f2;
  background: transparent;
  text-align: left;
  font: inherit;
  cursor: pointer;
}

nav a.active,
nav a:hover,
.logout button:hover {
  background: #223047;
  color: #fff;
}

.logout {
  margin-top: auto;
}

.main {
  margin-left: 245px;
  padding: 28px;
}

.login-main {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-box {
  width: min(420px, 100%);
}

.login-card,
.panel,
.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.login-card {
  padding: 28px;
}

.login-card h1 {
  margin: 0 0 22px;
  font-size: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

h1,
h2 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  font-size: 26px;
}

h2 {
  margin-bottom: 16px;
  font-size: 18px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.stat {
  padding: 18px;
}

.stat span,
.traffic span {
  display: block;
  color: var(--muted);
  margin-bottom: 8px;
}

.stat strong {
  font-size: 30px;
}

.panel {
  padding: 18px;
  margin-bottom: 18px;
}

.traffic {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.traffic div {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}

.traffic strong {
  font-size: 22px;
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-weight: 600;
}

input,
select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 10px;
  color: var(--text);
  background: #fff;
  font: inherit;
}

input[readonly] {
  background: #f1f4f8;
}

button,
.button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 12px;
  background: #fff;
  color: var(--text);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

button:hover,
.button:hover {
  border-color: #b9c4d3;
}

.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.primary:hover {
  border-color: var(--primary-dark);
  background: var(--primary-dark);
}

.danger {
  border-color: #ffd4cf;
  color: var(--danger);
}

.grid-form {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.grid-form .wide {
  grid-column: span 2;
}

.form-actions {
  display: flex;
  align-items: end;
  gap: 10px;
}

.search {
  display: flex;
  gap: 8px;
  width: min(440px, 100%);
}

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

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 780px;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 11px 10px;
  text-align: left;
  vertical-align: middle;
}

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

code {
  background: #eef3fa;
  border-radius: 6px;
  padding: 3px 6px;
}

.actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.actions form {
  margin: 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 9px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 12px;
}

.badge.ok {
  color: var(--success);
  background: #e5f7ef;
}

.badge.off {
  color: #8a4b00;
  background: var(--warning-bg);
}

.alert {
  border-radius: var(--radius);
  padding: 12px 14px;
  margin-bottom: 14px;
  font-weight: 700;
}

.alert.success {
  color: var(--success);
  background: #e5f7ef;
}

.alert.danger,
.panel.error {
  color: var(--danger);
  background: #fff1ef;
}

@media (max-width: 980px) {
  .sidebar {
    position: static;
    width: 100%;
  }

  .main {
    margin-left: 0;
    padding: 18px;
  }

  .stats,
  .traffic,
  .grid-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .topbar,
  .search {
    align-items: stretch;
    flex-direction: column;
  }

  .stats,
  .traffic,
  .grid-form {
    grid-template-columns: 1fr;
  }

  .grid-form .wide {
    grid-column: auto;
  }

  .actions {
    flex-wrap: wrap;
    justify-content: flex-start;
  }
}