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

    body {
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        min-height: 100vh;
        padding: 20px;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        background: white;
        border-radius: 15px;
        box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        overflow: hidden;
    }

    header {
        background: #2c3e50;
        color: white;
        padding: 20px;
        text-align: center;
    }

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

    .subtitle {
        color: #ecf0f1;
        font-size: 1rem;
    }

    .content {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
        padding: 20px;
    }

    @media (max-width: 768px) {
        .content {
            grid-template-columns: 1fr;
        }
    }

    .input-section {
        display: flex;
        flex-direction: column;
        gap: 15px;
    }

    .coord-inputs {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .input-group {
        display: flex;
        flex-direction: column;
    }

    label {
        font-weight: 600;
        margin-bottom: 5px;
        color: #2c3e50;
    }

    input {
        padding: 10px;
        border: 2px solid #bdc3c7;
        border-radius: 8px;
        font-size: 1rem;
        transition: border-color 0.3s;
    }

    input:focus {
        outline: none;
        border-color: #3498db;
    }

    button {
        background: #3498db;
        color: white;
        border: none;
        padding: 12px 20px;
        border-radius: 8px;
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        transition: background 0.3s;
    }

    button:hover {
        background: #2980b9;
    }

    button:disabled {
        background: #bdc3c7;
        cursor: not-allowed;
    }

    .map-container {
        height: 300px;
        border-radius: 8px;
        overflow: hidden;
        border: 2px solid #bdc3c7;
    }

    #map {
        height: 100%;
        width: 100%;
    }

    .chart-section {
        grid-column: 1 / -1;
        margin-top: 20px;
    }

    .chart-container {
        height: 400px;
        background: white;
        border-radius: 8px;
        padding: 20px;
        border: 2px solid #bdc3c7;
    }

    .loading {
        display: none;
        text-align: center;
        padding: 20px;
        color: #3498db;
        font-weight: 600;
    }

    .error {
        display: none;
        background: #e74c3c;
        color: white;
        padding: 15px;
        border-radius: 8px;
        margin-top: 10px;
        text-align: center;
    }

    .location-info {
        background: #ecf0f1;
        padding: 15px;
        border-radius: 8px;
        margin-top: 10px;
        text-align: center;
        font-weight: 600;
        color: #2c3e50;
    }

    .instructions {
        background: #f8f9fa;
        padding: 15px;
        border-radius: 8px;
        margin-top: 10px;
        border-left: 4px solid #3498db;
    }

    .instructions h3 {
        color: #2c3e50;
        margin-bottom: 10px;
    }

    .instructions ul {
        list-style-type: none;
        padding-left: 0;
    }

    .instructions li {
        margin-bottom: 8px;
        padding-left: 20px;
        position: relative;
    }

    .instructions li:before {
        content: "•";
        color: #3498db;
        font-weight: bold;
        position: absolute;
        left: 0;
    }