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

    .btn-back {
background: #f8f9fa;
color: #ff6b35;
padding: 12px 25px;
border: 2px solid #ff6b35;
border-radius: 10px;
font-size: 1em;
cursor: pointer;
transition: all 0.3s;
margin-right: 10px;
margin-top: 20px;
}
.btn-back:hover {
background: #ff6b35;
color: white;
}


    body {
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
        line-height: 1.6;
        color: #333;
        background: #f8f9fa;
    }

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

    header {
        text-align: center;
        margin-bottom: 40px;
    }

    h1 {
        font-size: 2.5em;
        margin-bottom: 20px;
        font-weight: 700;
    }

    .intro {
        font-size: 1.2em;
        max-width: 800px;
        margin: 0 auto;
        opacity: 0.95;
    }

    .estimator-card {
        padding: 20px;
        margin-bottom: 60px;
    }

    .estimator-title {
        color: #ff6b35;
        font-size: 2em;
        margin-bottom: 30px;
        text-align: center;
    }

    .step {
        display: none;
        animation: fadeIn 0.5s;
    }

    .step.active {
        display: block;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(20px);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .step-header {
        font-size: 1.4em;
        color: #333;
        margin-bottom: 20px;
        font-weight: 600;
    }

    .map-container {
        display: flex;
        gap: 30px;
        margin-top: 20px;
        flex-wrap: wrap;
    }

    .france-map {
        flex: 1;
        min-width: 300px;
        max-width: 500px;
        margin: 0 auto;
    }

    .france-map svg {
        width: 100%;
        height: auto;
    }

    .france-map path {
        fill: #8ad;
        stroke: #fff;
        stroke-width: 0.5;
        transition: all 0.3s;
        cursor: pointer;
    }

    .france-map path:hover {
        fill: #ff6b35;
        opacity: 0.8;
    }

    .france-map path.selected {
        fill: #ff6b35;
    }

    .france-map #corsica_separating_line {
        cursor: default;
        pointer-events: none;
    }

    .department-select {
        flex: 1;
        min-width: 300px;
    }

    select,
    input {
        width: 100%;
        padding: 15px;
        font-size: 1.1em;
        border: 2px solid #e0e0e0;
        border-radius: 10px;
        margin-bottom: 15px;
        transition: border-color 0.3s;
    }

    select:focus,
    input:focus {
        outline: none;
        border-color: #ff6b35;
    }

    .project-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 20px;
        margin-top: 20px;
    }

    .project-card {
        background: #f8f9fa;
        padding: 25px;
        border-radius: 15px;
        cursor: pointer;
        border: 3px solid transparent;
        transition: all 0.3s;
        text-align: center;
    }

    .project-card:hover {
        border-color: #ff6b35;
        background: #fff;
        transform: translateY(-5px);
        box-shadow: 0 5px 20px rgba(255, 107, 53, 0.2);
    }

    .project-card.selected {
        border-color: #ff6b35;
        background: #fff5f0;
    }

    .project-icon {
        font-size: 2.5em;
        margin-bottom: 10px;
    }

    .dimensions-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 20px;
        margin-top: 20px;
    }

    .input-group {
        margin-bottom: 20px;
    }

    .input-group label {
        display: block;
        margin-bottom: 8px;
        font-weight: 600;
        color: #555;
    }

    .option-details {
        background: #f0f8ff;
        border-left: 4px solid #ff6b35;
        padding: 15px;
        margin-top: 10px;
        border-radius: 8px;
        font-size: 0.95em;
        line-height: 1.6;
    }

    .option-details p {
        margin-bottom: 12px;
    }

    .option-details p:last-child {
        margin-bottom: 0;
    }

    .option-details strong {
        color: #ff6b35;
    }

    .thickness-info {
        background: #f9f0e6;
        border: 2px solid #ff6b35;
        padding: 15px;
        margin-top: 12px;
        border-radius: 8px;
        font-size: 0.95em;
    }

    .thickness-info strong {
        color: #ff6b35;
        display: block;
        margin-bottom: 10px;
    }

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

    .thickness-info li {
        padding: 6px 0;
        padding-left: 20px;
        position: relative;
        margin-bottom: 4px;
    }

    .thickness-info li:before {
        content: "▸";
        color: #ff6b35;
        position: absolute;
        left: 0;
        font-weight: bold;
    }

    .thickness-info p {
        margin-bottom: 0;
    }

    .thickness-toggle {
        width: 100%;
        padding: 12px 15px;
        margin-top: 10px;
        background: #f9f0e6;
        border: 2px solid #ff6b35;
        border-radius: 8px;
        font-size: 0.95em;
        font-weight: 600;
        color: #ff6b35;
        cursor: pointer;
        transition: all 0.3s ease;
        text-align: left;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .thickness-toggle:hover {
        background: #ffe8d6;
        transform: translateX(2px);
    }

    .thickness-toggle .toggle-icon {
        display: inline-block;
        transition: transform 0.3s ease;
        margin-left: 10px;
    }

    .thickness-toggle.expanded .toggle-icon {
        transform: rotate(180deg);
    }

    .thickness-options {
        display: flex;
        gap: 10px;
        margin-top: 10px;
        flex-wrap: wrap;
    }

    .thickness-btn {
        padding: 10px 20px;
        border: 2px solid #e0e0e0;
        background: white;
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.3s;
    }

    .thickness-btn:hover,
    .thickness-btn.active {
        border-color: #ff6b35;
        background: #ff6b35;
        color: white;
    }

    .btn {
        background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
        color: white;
        padding: 15px 40px;
        border: none;
        border-radius: 10px;
        font-size: 1.1em;
        cursor: pointer;
        transition: transform 0.3s, box-shadow 0.3s;
        margin-top: 20px;
    }

    .btn:hover {
        transform: translateY(-2px);
        box-shadow: 0 5px 20px rgba(255, 107, 53, 0.3);
    }

    .btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
    }

    .result-card {
        background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
        color: white;
        padding: 40px;
        border-radius: 20px;
        text-align: center;
        margin-top: 30px;
    }

    .result-price {
        font-size: 3em;
        font-weight: 700;
        margin: 20px 0;
    }

    .result-details {
        background: rgba(255, 255, 255, 0.2);
        padding: 20px;
        border-radius: 10px;
        margin-top: 20px;
    }

    .result-detail {
        display: flex;
        justify-content: space-between;
        padding: 10px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.3);
    }

    .result-detail:last-child {
        border-bottom: none;
    }

    article {
        padding: 40px;
        margin-top: 40px;
    }

    article h2 {
        color: #ff6b35;
        font-size: 2em;
        margin-top: 40px;
        margin-bottom: 20px;
    }

    article h3 {
        color: #333;
        font-size: 1.5em;
        margin-top: 30px;
        margin-bottom: 15px;
    }

    article p {
        margin-bottom: 15px;
        font-size: 1.1em;
        line-height: 1.8;
    }

    article ul {
        margin-left: 30px;
        margin-bottom: 20px;
    }

    article li {
        margin-bottom: 10px;
        font-size: 1.1em;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin: 20px 0;
        background: white;
        border-radius: 10px;
        overflow: hidden;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }

    table th {
        background: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
        color: white;
        padding: 15px;
        text-align: left;
        font-weight: 600;
    }

    table td {
        padding: 12px 15px;
        border-bottom: 1px solid #e0e0e0;
    }

    table tr:last-child td {
        border-bottom: none;
    }

    table tr:nth-child(even) {
        background: #f9f9f9;
    }

    table tr:hover {
        background: #f0f0f0;
    }

    .highlight-box {
        background: #fff5f0;
        border-left: 4px solid #ff6b35;
        padding: 20px;
        margin: 30px 0;
        border-radius: 10px;
    }

    @media (max-width: 768px) {
        h1 {
            font-size: 1.8em;
        }

        .estimator-card,
        article {
            padding: 20px;
        }

        .project-grid {
            grid-template-columns: 1fr;
        }

        .result-price {
            font-size: 2em;
        }
    }