:root {
  --bg: #0c1117;
  --panel: #121a24;
  --panel-2: #172233;
  --text: #e8eef7;
  --muted: #8fa0b5;
  --line: rgba(255,255,255,.08);
  --accent: #f2b84b;
  --green: #2fd17c;
  --red: #ff5d5d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at top left, #1b2738, var(--bg) 45%);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

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

.sidebar {
  width: 280px;
  padding: 24px;
  background: rgba(10, 15, 22, .92);
  border-right: 1px solid var(--line);
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 28px;
}

.logo,
.login-logo {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #2a3a52, #111823);
  font-size: 25px;
  border: 1px solid var(--line);
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

nav {
  display: grid;
  gap: 8px;
}

nav a {
  padding: 12px 14px;
  border-radius: 12px;
  color: var(--muted);
}

nav a:hover {
  background: var(--panel);
  color: var(--text);
}

.content {
  flex: 1;
  padding: 34px;
}

.hero {
  margin-bottom: 24px;
}

.hero h1 {
  margin: 0;
  font-size: 34px;
}

.hero p {
  margin: 8px 0 0;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.card {
  background: linear-gradient(180deg, var(--panel), #0f1722);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 22px;
  box-shadow: 0 18px 40px rgba(0,0,0,.18);
}

.card h2 {
  margin: 0 0 10px;
}

.card p {
  color: var(--muted);
}

.modem-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.badge {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.badge.free {
  background: rgba(47, 209, 124, .15);
  color: var(--green);
}

.badge.busy {
  background: rgba(255, 93, 93, .15);
  color: var(--red);
}

button {
  border: 0;
  border-radius: 12px;
  background: var(--accent);
  color: #17110a;
  padding: 12px 16px;
  font-weight: 800;
  cursor: pointer;
}

button:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.section {
  margin-top: 30px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}

th,
td {
  padding: 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: 14px;
}

th {
  color: var(--muted);
  background: rgba(255,255,255,.03);
}

.muted {
  color: var(--muted);
}

.login-page {
  display: grid;
  place-items: center;
  min-height: 100vh;
}

.login-card {
  width: min(420px, calc(100vw - 32px));
  background: linear-gradient(180deg, var(--panel), #0e151f);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 30px;
  box-shadow: 0 24px 60px rgba(0,0,0,.35);
}

.login-card h1 {
  margin: 18px 0 6px;
}

.login-card p {
  color: var(--muted);
  margin-bottom: 24px;
}

label {
  display: block;
  margin: 14px 0 7px;
  color: var(--muted);
}

input,
select {
  width: 100%;
  border: 1px solid var(--line);
  background: #0b1119;
  color: var(--text);
  border-radius: 12px;
  padding: 12px;
}

.login-card button {
  width: 100%;
  margin-top: 20px;
}

.alert {
  background: rgba(255, 93, 93, .14);
  color: #ffb4b4;
  border: 1px solid rgba(255, 93, 93, .28);
  padding: 12px;
  border-radius: 12px;
}

.inline-form {
  display: grid;
  grid-template-columns: 1fr 1fr 160px auto;
  gap: 12px;
}

@media (max-width: 800px) {
  .layout {
    display: block;
  }

  .sidebar {
    width: 100%;
  }

  .content {
    padding: 20px;
  }

  .inline-form {
    grid-template-columns: 1fr;
  }
}