:root {
  --sentinel-navy: #071827;
  --sentinel-navy-2: #102b46;
  --sentinel-red: #d90429;
  --sentinel-red-dark: #a4001f;
  --sentinel-bg: #eef3f8;
  --sentinel-card: #ffffff;
  --sentinel-border: #d8e0ec;
  --sentinel-text: #101827;
  --sentinel-muted: #64748b;
  --sentinel-green: #16a34a;
  --sentinel-amber: #d97706;
  --shadow-soft: 0 16px 42px rgba(15, 39, 64, 0.08);
  --shadow-strong: 0 24px 80px rgba(0, 0, 0, 0.24);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(217, 4, 41, 0.10), transparent 35%),
    linear-gradient(135deg, #f8fafc 0%, var(--sentinel-bg) 100%);
  color: var(--sentinel-text);
}

a {
  color: var(--sentinel-red);
  font-weight: 800;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1 {
  font-size: 42px;
  margin: 0 0 12px;
  letter-spacing: -1.1px;
  color: var(--sentinel-navy);
}

h2 {
  margin: 0 0 16px;
  color: var(--sentinel-navy);
  font-size: 24px;
}

p {
  line-height: 1.55;
}

.shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

aside {
  background:
    linear-gradient(180deg, rgba(217, 4, 41, 0.20), transparent 30%),
    linear-gradient(180deg, var(--sentinel-navy), var(--sentinel-navy-2));
  color: white;
  padding: 30px 26px;
  box-shadow: 10px 0 36px rgba(7, 24, 39, 0.14);
}

aside h2 {
  color: white;
  font-size: 30px;
  margin: 0 0 4px;
  letter-spacing: -0.7px;
}

aside p {
  color: #b8c4d8;
  margin: 0 0 28px;
  font-weight: 700;
}

aside a,
aside button {
  display: block;
  width: 100%;
  margin: 10px 0;
  padding: 13px 14px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.10);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.13);
  text-align: left;
  font-weight: 800;
  transition: 0.18s ease;
}

aside a:hover,
aside button:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: translateX(2px);
  text-decoration: none;
}

main {
  padding: 36px;
}

main > p:first-of-type {
  color: var(--sentinel-muted);
  font-size: 18px;
  margin-top: -4px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(160px, 1fr));
  gap: 18px;
  margin: 30px 0 24px;
}

.stats div,
.panel,
.card {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--sentinel-border);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow-soft);
}

.stats span {
  display: block;
  color: var(--sentinel-muted);
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 12px;
}

.stats strong {
  display: block;
  font-size: 44px;
  margin-top: 10px;
  letter-spacing: -1px;
  color: var(--sentinel-navy);
}

.panel {
  margin: 24px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 10px 26px rgba(15, 39, 64, 0.05);
}

th,
td {
  padding: 15px;
  border-bottom: 1px solid var(--sentinel-border);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f8fafc;
  color: var(--sentinel-muted);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

tr:hover td {
  background: #f9fbff;
}

small {
  color: var(--sentinel-muted);
  font-weight: 600;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(300px, 1fr));
  gap: 22px;
}

button,
.button {
  background: var(--sentinel-red);
  color: white;
  border: 0;
  border-radius: 13px;
  padding: 11px 16px;
  font-weight: 900;
  cursor: pointer;
  margin: 6px 0;
  transition: 0.18s ease;
}

button:hover,
.button:hover {
  background: var(--sentinel-red-dark);
}

.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at top left, rgba(217, 4, 41, 0.24), transparent 35%),
    linear-gradient(135deg, var(--sentinel-navy), var(--sentinel-navy-2));
}

.login-card {
  width: min(430px, calc(100vw - 32px));
  background: white;
  padding: 34px;
  border-radius: 26px;
  box-shadow: var(--shadow-strong);
}

.login-card h1 {
  font-size: 32px;
  color: var(--sentinel-navy);
}

.login-card p {
  color: var(--sentinel-muted);
  font-weight: 700;
}

.login-card input {
  width: 100%;
  padding: 13px;
  margin: 8px 0 14px;
  border-radius: 14px;
  border: 1px solid var(--sentinel-border);
}

.alert-error {
  background: #ffe1e8;
  color: var(--sentinel-red);
  padding: 13px;
  border-radius: 14px;
  margin: 12px 0;
  font-weight: 800;
}

.badge,
.status-pill {
  display: inline-block;
  padding: 6px 11px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
  background: #e5eaf2;
  color: var(--sentinel-text);
}

.badge-danger,
.status-danger {
  background: #ffe1e8;
  color: var(--sentinel-red);
}

.badge-success,
.status-success {
  background: #dcfce7;
  color: var(--sentinel-green);
}

.badge-warning,
.status-warning {
  background: #fff1d6;
  color: var(--sentinel-amber);
}

@media (max-width: 1000px) {
  .shell,
  .stats,
  .grid {
    grid-template-columns: 1fr;
  }

  aside {
    box-shadow: none;
  }

  main {
    padding: 22px;
  }
}