/* Key Concepts Section Styles */
    .key-concepts {
        width: 100%;
        padding: 80px 0;
        position: relative;
    }

    .concepts-container {
        max-width: 1140px;
        margin: 0 auto;
        position: relative;
        z-index: 2;
        display: flex;
        justify-content: center;
    }

    .concepts-grid {
        width: 858px;
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
    }

    .concept-box {
        width: 150px;
        height: 150px;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: linear-gradient(90deg, #FF5900 0%, #134B9D 100%);
        backdrop-filter: blur(10px);
        transition: all 0.4s ease;
        position: relative;
        overflow: hidden;
        text-align: left;
    }

    .inner-concept-box {
        width: 148px;
        height: 148px;
        background: black;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 20px 15px;
        box-sizing: border-box;
    }

    .concept-box::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        border: 1px solid transparent;
        border-radius: 16px;
        background: linear-gradient(135deg,
                rgba(222, 116, 21, 0.1) 0%,
                rgba(111, 110, 94, 0.1) 50%,
                rgba(0, 104, 166, 0.1) 100%);
        mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
        mask-composite: exclude;
        -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
        -webkit-mask-composite: xor;
        padding: 1px;
        opacity: 0;
        transition: opacity 0.4s ease;
    }

    .concept-box:hover {
        transform: translateY(-8px) scale(1.05);
        border-color: rgba(255, 255, 255, 0.4);
        background: rgba(255, 255, 255, 0.05);
        box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    }

    .concept-box:hover::before {
        opacity: 1;
    }

    .concept-icon {
        color: white;
        margin-bottom: 20px;
        transition: all 0.4s ease;
        position: relative;
    }

    .concept-box:hover .concept-icon {
        color: #DE7415;
        transform: scale(1.1);
    }

    /* Individual icon color variations on hover */
    .concept-box:nth-child(2):hover .concept-icon {
        color: #6F6E5E;
    }

    .concept-box:nth-child(3):hover .concept-icon {
        color: #0068A6;
    }

    .concept-box:nth-child(4):hover .concept-icon {
        color: #DE7415;
    }

    .concept-box:nth-child(5):hover .concept-icon {
        color: #6F6E5E;
    }

    .concept-title {
        font-size: 16px;
        font-weight: 400;
        color: white;
        margin: 0;
        line-height: 1.4;
        text-align: left;
        transition: all 0.3s ease;
    }

    .concept-box:hover .concept-title {
        color: rgba(255, 255, 255, 0.9);
        transform: translateY(2px);
    }

    /* Mobile Responsiveness */
    @media (max-width: 1200px) {
        .concepts-container {
            max-width: 95%;
        }

        .concepts-grid {
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 25px;
        }

        .concept-box {
        width: 150px;
        height: 150px;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: linear-gradient(90deg, #FF5900 0%, #134B9D 100%);
        backdrop-filter: blur(10px);
        transition: all 0.4s ease;
        position: relative;
        overflow: hidden;
        text-align: left;
    }

    .inner-concept-box {
        width: 148px;
        height: 148px;
        background: black;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 20px 15px;
        box-sizing: border-box;
    }
    }

    @media (max-width: 768px) {
        .key-concepts {
            padding: 60px 0;
        }

        .concepts-grid {
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .concept-box {
        width: 150px;
        height: 150px;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: linear-gradient(90deg, #FF5900 0%, #134B9D 100%);
        backdrop-filter: blur(10px);
        transition: all 0.4s ease;
        position: relative;
        overflow: hidden;
        text-align: left;
    }

    .inner-concept-box {
        width: 148px;
        height: 148px;
        background: black;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 20px 15px;
        box-sizing: border-box;
    }

        .concept-icon {
            width: 40px;
            height: 40px;
            margin-bottom: 15px;
        }

        .concept-title {
            font-size: 15px;
        }
    }

    @media (max-width: 480px) {
        .concepts-grid {
            grid-template-columns: 1fr;
            gap: 15px;
        }

        .concept-box {
        width: 150px;
        height: 150px;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: linear-gradient(90deg, #FF5900 0%, #134B9D 100%);
        backdrop-filter: blur(10px);
        transition: all 0.4s ease;
        position: relative;
        overflow: hidden;
        text-align: left;
    }

    .inner-concept-box {
        width: 148px;
        height: 148px;
        background: black;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 20px 15px;
        box-sizing: border-box;
    }

        .concept-icon {
            width: 36px;
            height: 36px;
            margin-bottom: 12px;
        }

        .concept-title {
            font-size: 14px;
        }
    }

    @media (max-width: 380px) {
        .concept-box {
        width: 150px;
        height: 150px;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        background: linear-gradient(90deg, #FF5900 0%, #134B9D 100%);
        backdrop-filter: blur(10px);
        transition: all 0.4s ease;
        position: relative;
        overflow: hidden;
        text-align: left;
    }

    .inner-concept-box {
        width: 148px;
        height: 148px;
        background: black;
        border-radius: 16px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 20px 15px;
        box-sizing: border-box;
    }

        .concept-icon {
            width: 32px;
            height: 32px;
            margin-bottom: 10px;
        }

        .concept-title {
            font-size: 13px;
        }
    }