* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: #111827;
    color: #e5e7eb;
}

.topbar {
    background: #020617;
    border-bottom: 1px solid #1f2937;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar h1 {
    margin: 0;
    font-size: 1.4rem;
}

.topbar p {
    margin: 0.2rem 0 0;
    color: #9ca3af;
}

nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

nav a {
    color: #e5e7eb;
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
}

nav a:hover {
    background: #1f2937;
}

.nav-user {
    color: #93c5fd;
    padding: 0.5rem 0.75rem;
    border-left: 1px solid #1f2937;
    margin-left: 0.5rem;
}

.container {
    padding: 2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin-bottom: 1rem;
}

.card {
    background: #020617;
    border: 1px solid #1f2937;
    border-radius: 1rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

.card h2 {
    margin-top: 0;
}

.big-number {
    font-size: 2.5rem;
    font-weight: 700;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    text-align: left;
    padding: 0.75rem;
    border-bottom: 1px solid #1f2937;
}

th {
    color: #9ca3af;
    font-weight: 600;
}

small, .muted {
    color: #9ca3af;
}

.status {
    padding: 0.25rem 0.5rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.85rem;
}

.online {
    background: #064e3b;
    color: #a7f3d0;
}

.offline {
    background: #7f1d1d;
    color: #fecaca;
}

.button, button {
    display: inline-block;
    background: #2563eb;
    color: white;
    text-decoration: none;
    border: 0;
    padding: 0.55rem 0.85rem;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
}

button:disabled {
    background: #374151;
    color: #9ca3af;
    cursor: not-allowed;
}

button.danger {
    background: #991b1b;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

label {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    color: #d1d5db;
}

label.wide {
    grid-column: span 3;
}

input {
    background: #111827;
    color: #e5e7eb;
    border: 1px solid #374151;
    border-radius: 0.5rem;
    padding: 0.65rem;
}

input:focus {
    outline: 2px solid #2563eb;
    border-color: #2563eb;
}

.login-page {
    min-height: 100vh;
    background: radial-gradient(circle at top, #1e293b 0, #020617 55%);
}

.login-container {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: #020617;
    border: 1px solid #1f2937;
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 25px 60px rgba(0,0,0,0.45);
}

.login-card h1 {
    margin-top: 0;
    margin-bottom: 0.25rem;
}

.login-card p {
    color: #9ca3af;
    margin-top: 0;
    margin-bottom: 1.5rem;
}

.login-card form {
    display: grid;
    gap: 1rem;
}

.error-box {
    background: #7f1d1d;
    color: #fecaca;
    border: 1px solid #991b1b;
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.power-frame {
    width: 100%;
    min-height: 520px;
    border: 1px solid #1f2937;
    border-radius: 0.75rem;
    background: #020617;
}