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

body {
    font-family: var(--font-futura);
}

/* Font family Helvetica Neue start */

@font-face {
    font-family: 'Helvetica Neue';
    src: url('../fonts/HelveticaNeue-Light.woff2') format('woff2'),
        url('../fonts/HelveticaNeue-Light.woff') format('woff');
    font-weight: 300;
    font-display: swap;
}

@font-face {
    font-family: 'Helvetica Neue';
    src: url('../fonts/HelveticaNeue-Roman.woff2') format('woff2'),
        url('../fonts/HelveticaNeue-Roman.woff') format('woff');
    font-weight: 400;
    font-display: swap;
}

@font-face {
    font-family: 'Helvetica Neue';
    src: url('../fonts/HelveticaNeue-Medium.woff2') format('woff2'),
        url('../fonts/HelveticaNeue-Medium.woff') format('woff');
    font-weight: 500;
    font-display: swap;
}

@font-face {
    font-family: 'Helvetica Neue';
    src: url('../fonts/HelveticaNeue-Bold.woff2') format('woff2'),
        url('../fonts/HelveticaNeue-Bold.woff') format('woff');
    font-weight: 700;
    font-display: swap;
}

/* Font family Helvetica Neue end */

:root {
    /* Font Families */
    --font-helvetica: 'Helvetica Neue', sans-serif;
    --font-futura: "futura-pt", sans-serif;

    /* Font Weights */
    --fw-light: 300;
    --fw-regular: 400;
    --fw-medium: 500;
    --fw-bold: 700;

    /* Colors */
    --color-white: #FFFFFF;
    --color-banner-text: #A9CFEA;
    --color-banner-below: #2EA3DC;
    --color-heading-title: #75C0E5;
    --color-subheading: #424149;
    --color-subheading-paragraph: #696A6A;
    --color-slider-heading: #444343;
    --color-client: #8B8C8E;

    /* Header & Navigation */
    --fs-header-menu: 14px;
    --lh-header-menu: normal;
    --fw-header-menu: 400;

    /* Banner Section */
    --fs-banner-text: 65px;
    --lh-banner-text: 89px;
    --fw-banner-text: 300;

    --fs-banner-below: 51px;
    --lh-banner-below: 78px;
    --fw-banner-below: 400;

    /* Buttons */
    --fs-button: 17px;
    --lh-button: 40px;
    --fw-button: 400;

    /* Heading Titles */
    --fs-heading-title: 74px;
    --lh-heading-title: 50px;
    --fw-heading-title: 400;
    --ls-heading-title: 10px;

    /* Card Components */
    --fs-card-heading: 27px;
    --fs-card-subheading: 22px;
    --fs-card-paragraph: 16px;
    --lh-card: 45px;
    --fw-card: 500;
    --ls-card: 45px;

    /* Slider General */
    --lh-slider: 38px;

    --fs-slider-paragraph: 21px;
    --lh-slider-paragraph: 38px;
    --fw-slider-paragraph: 400;
    --ls-slider-paragraph: 21px;

    /* Slider Spotlight */
    --fs-slider-spotlight-heading: 74px;
    --lh-slider-spotlight-heading: 60px;
    --fw-slider-spotlight-heading: 400;
    --ls-slider-spotlight-heading: 6px;

    --fs-slider-spotlight-paragraph: 28px;
    --lh-slider-spotlight-paragraph: 60px;
    --fw-slider-spotlight-paragraph: 500;
    --ls-slider-spotlight-paragraph: 6px;

    /* Call to Action Sections */
    --fs-want-to-work: 64px;
    --lh-want-to-work: 85px;
    --fw-want-to-work: 500;

    --fs-lets-connect: 64px;
    --lh-lets-connect: 90px;
    --fw-lets-connect: 500;

    /* Paragraphs */
    --fs-paragraph: 24px;
    --lh-paragraph: 40px;
    --fw-paragraph: 400;

    /* Client Section */
    --fs-client-heading: 76px;
    --lh-client-heading: 80px;
    --fw-client-heading: 700;
    --ls-client-heading: 6px;

    /* Footer */
    --fs-footer-title: 24px;
    --fs-footer-menu: 18px;
    --lh-footer-menu: 30px;
    --fw-footer: 500;

    --fs-footer-sub-paragraph: 28px;
    --lh-footer-sub-paragraph: 42px;
    --fw-footer-sub-paragraph: 400;
    --ls-footer-sub-paragraph: 4px;

    --fs-footer-paragraph: 18px;
    --lh-footer-paragraph: 23px;
    --fw-footer-paragraph: 400;
    --ls-footer-paragraph: 2px;
}

img {
    width: 100%;
    display: block;
}

.container {
    width: 100%;
    max-width: 90%;
    margin: 0 auto;
}

section {
    padding: 80px 0;
}

/* Header css start */

section.hero_section {
    padding: 0;
}

.main_header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0px;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 99;
    transition: background-color 0.3s ease, padding 0.3s ease;
}
 .header_container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0px 0px;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 99;
    transition: background-color 0.3s ease, padding 0.3s ease;
}

.main_header.scrolled {
    background: rgba(44, 62, 80, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px var(--shadow);
}

.main_header .rk_logo img {
    max-width: 165px;
}

.main_header nav ul {
    display: flex;
    list-style: none;
    column-gap: 100px;
}

.main_header nav ul li a {
    text-decoration: none;
    color: var(--color-white);
    font-size: var(--fs-header-menu);
    line-height: var(--lh-header-menu);
    font-weight: var(--fw-header-menu);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.menu_toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    z-index: 101;
}

.menu_toggle span {
    width: 30px;
    height: 3px;
    &:not(.scrolled span, .main_header:has(nav.active) span){
       background: #fff; 
    }
    background-color: var(--color-white);
    margin: 4px 0;
    transition: 0.4s;
}

.menu_toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-6px, 6px);
}

.menu_toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu_toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-6px, -6px);
}

@media (max-width: 768px) {

    .main_header.scrolled {
        backdrop-filter: unset;
    }
    .main_header {
        padding: 15px 0px;
    }

    .main_header.scrolled {
        padding: 12px 0px;
    }

    .menu_toggle {
        display: flex;
    }

    .main_header nav {
        position: fixed;
        top: 0;
        left: -100%;
        width: 280px;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.98);
        transition: left 0.4s ease;
        padding: 40px 30px;
    }

    .main_header nav.active {
        left: 0;
    }

    .main_header nav ul {
        flex-direction: column;
        column-gap: 0;
        row-gap: 30px;
    }

    html:has(nav.active){
        overflow: hidden;
    }

    .overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.7);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.4s ease;
        z-index: 98;
    }

    .overlay.active {
        opacity: 1;
        visibility: visible;
    }
}

/* Header css end */