* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    border-radius: 10px;
}

h1 {
    font-size: 2em;
    margin-bottom: 10px;
}

h2 {
    color: #1e3c72;
    margin: 20px 0 15px;
    border-bottom: 2px solid #2a5298;
    padding-bottom: 8px;
}

form {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

form input, form select {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

form button {
    background-color: #2a5298;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    width: 100%;
}

form button:hover {
    background-color: #1e3c72;
}

.room-card {
    background: white;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.room-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
}

.room-actions button {
    width: auto;
    padding: 8px 12px;
    font-size: 12px;
}

.checklist-item {
    display: flex;
    align-items: center;
    padding: 10px;
    margin-bottom: 8px;
    background: white;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.checklist-item input[type="checkbox"] {
    margin-right: 10px;
    width: 18px;
    height: 18px;
}

.checklist-item.completed {
    text-decoration: line-through;
    opacity: 0.7;
}

.file-upload {
    display: flex;
    align-items: center;
}

.file-upload input[type="file"] {
    flex: 1;
    margin: 0 10px 0 0;
}

.file-upload button {
    width: auto;
    padding: 12px 20px;
}

@media (min-width: 768px) {
    form {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    form button {
        grid-column: span 2;
    }
}

/* Energy calculation section */
.energy-result {
    background: #e8f4fd;
    border-left: 4px solid #2a5298;
    padding: 15px;
    margin: 15px 0;
    border-radius: 4px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    h1 {
        font-size: 1.5em;
    }
}