/* Базовые стили */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
    color: #333;
}

header {
    background: #2c3e50;
    color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 10px;
}

main {
    padding: 2rem;
}

/* Карточки устройств */
.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.device-card {
    background: white;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.device-card.on {
    border-left: 4px solid #2ecc71;
}

.device-card.off {
    border-left: 4px solid #e74c3c;
}

.status {
    font-weight: bold;
}

/* Формы */
.login-container {
    width: 300px;
    margin: 100px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

input, button, select {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    background: #3498db;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #2980b9;
}

.error {
    color: #c0392b;
    font-weight: bold;
}

/* Таблицы */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #f8f9fa;
}