:root {
            --primary-color: #2563eb;
            --secondary-color: #3b82f6;
            --accent-color: #06b6d4;
            --text-primary: #1f2937;
            --text-secondary: #6b7280;
            --bg-primary: #ffffff;
            --bg-secondary: #f9fafb;
            --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .dark-mode {
            --primary-color: #3b82f6;
            --secondary-color: #60a5fa;
            --accent-color: #06b6d4;
            --text-primary: #f9fafb;
            --text-secondary: #d1d5db;
            --bg-primary: #111827;
            --bg-secondary: #1f2937;
            --bg-gradient: linear-gradient(135deg, #1e3a8a 0%, #7e22ce 100%);
            --card-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
        }

    * {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
     font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

    body {
     background: var(--bg-gradient);
     display: flex;
     justify-content: center;
     align-items: center;
     min-height: 100vh;
     padding: 20px;
     transition: var(--transition);
     color: var(--text-primary);
   }

    .header {
       position: fixed;
       top: .5rem;
       left: 50%;
       transform: translateX(-50%);
       width: 50%;
       height: 2.75rem;
       background: rgba(255, 255, 255, 0.1);
       backdrop-filter: blur(25px);
       -webkit-backdrop-filter: blur(25px);
       display: flex;
       justify-content: center;
       align-items: center;
       padding: 0 2rem;
       border-radius: 4rem;
       z-index: 1000;
       border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

        .controls {
            display: flex;
            gap: 2rem;
            align-items: center;
        }

        .toggle-btn {
            background: rgba(255, 255, 255, 0.2);
            border: none;
            border-radius: 50px;
            padding: 0.5rem 1rem;
            color: #fff;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .toggle-btn:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-2px);
        }

        .card-container {
            width: 100%;
            max-width: 420px;
            margin-top: 2rem;
        }

        .card {
            background: var(--bg-primary);
            border-radius: 24px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: var(--transition);
        }

        .card:hover {
            transform: translateY(-10px);
        }

        .card-header {
            background: var(--bg-gradient), url('../img/background.png');
            background-size: cover;
            background-blend-mode: overlay;
            padding: 40px 30px 100px;
            position: relative;
            text-align: center;
            color: #fff;
        }

        .profile-img-container {
            position: absolute;
            bottom: -50px;
            left: 50%;
            transform: translateX(-50%);
        }

        .profile-img {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            border: 5px solid var(--bg-primary);
            background-color: #f0f0f0;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 40px;
            color: var(--primary-color);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
            overflow: hidden;
            transition: var(--transition);
        }

        .profile-img:hover {
            transform: scale(1.05);
        }

        .profile-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .card-body {
            padding: 70px 30px 30px;
            text-align: center;
            background: var(--bg-primary);
        }

        .name {
            font-size: 26px;
            font-weight: 700;
            margin-bottom: 5px;
            color: var(--text-primary);
            text-transform: capitalize;
        }

        .title {
            font-size: 16px;
            color: var(--accent-color);
            margin-bottom: 20px;
            font-weight: 600;
            text-transform: capitalize;
        }

        .description {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 25px;
        }

        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 25px;
        }

       .contact-item {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    color: var(--text-primary);
    padding: 12px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.contact-item:hover {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding-left: 10px;
}

.contact-item a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    width: 100%;
}

.contact-item a:hover {
    color: var(--primary-color);
}

.contact-item i {
    margin-right: 12px;
    font-size: 18px;
    color: var(--primary-color);
    width: 24px;
    text-align: center;
}

        .social-links {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 25px;
        }

        .social-link {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary-color);
            color: #ffffff;
            font-size: 1.25rem;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            transition: var(--transition);
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }

        .social-link:hover {
            transform: translateY(-5px);
            background: var(--accent-color);
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.2);
        }

        .add-contact-btn {
            background: var(--bg-gradient);
            color: #ffffff;
            border: none;
            padding: 16px 30px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 5px 15px rgba(37, 99, 235, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto;
            width: 80%;
        }

        .add-contact-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(37, 99, 235, 0.6);
        }

        .add-contact-btn:active {
            transform: translateY(1px);
        }

        .add-contact-btn i {
            margin-right: 10px;
        }

        .language-selector {
            position: relative;
        }

        .language-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            background: var(--bg-primary);
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            padding: 0.5rem 0;
            display: none;
            min-width: 120px;
            z-index: 1001;
        }

        .language-dropdown.show {
            display: block;
        }

        .language-option {
            padding: 0.5rem 1rem;
            cursor: pointer;
            transition: var(--transition);
        }

        .language-option:hover {
            background: #f0f0f0;
        }
 
        .theme-switch {
            --toggle-size: 12px;
            --container-width: 5.625em;
            --container-height: 2.5em;
            --container-radius: 6.25em;
            --container-light-bg: #3D7EAE;
            --container-night-bg: #1D1F2C;
            --circle-container-diameter: 3.375em;
            --sun-moon-diameter: 2.125em;
            --sun-bg: #ECCA2F;
            --moon-bg: #C4C9D1;
            --spot-color: #959DB1;
            --circle-container-offset: calc((var(--circle-container-diameter) - var(--container-height)) / 2 * -1);
            --stars-color: #fff;
            --clouds-color: #F3FDFF;
            --back-clouds-color: #AACADF;
            --transition: .5s cubic-bezier(0, -0.02, 0.4, 1.25);
            --circle-transition: .3s cubic-bezier(0, -0.02, 0.35, 1.17);
        }

        .theme-switch, .theme-switch *, .theme-switch *::before, .theme-switch *::after {
            -webkit-box-sizing: border-box;
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-size: var(--toggle-size);
        }

        .theme-switch__container {
            width: var(--container-width);
            height: var(--container-height);
            background-color: var(--container-light-bg);
            border-radius: var(--container-radius);
            overflow: hidden;
            cursor: pointer;
            -webkit-box-shadow: 0em -0.062em 0.062em rgba(0, 0, 0, 0.25), 0em 0.062em 0.125em rgba(255, 255, 255, 0.94);
            box-shadow: 0em -0.062em 0.062em rgba(0, 0, 0, 0.25), 0em 0.062em 0.125em rgba(255, 255, 255, 0.94);
            -webkit-transition: var(--transition);
            -o-transition: var(--transition);
            transition: var(--transition);
            position: relative;
        }

        .theme-switch__container::before {
            content: "";
            position: absolute;
            z-index: 1;
            inset: 0;
            -webkit-box-shadow: 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset, 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset;
            box-shadow: 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset, 0em 0.05em 0.187em rgba(0, 0, 0, 0.25) inset;
            border-radius: var(--container-radius)
        }

        .theme-switch__checkbox {
            display: none;
        }

        .theme-switch__circle-container {
            width: var(--circle-container-diameter);
            height: var(--circle-container-diameter);
            background-color: rgba(255, 255, 255, 0.1);
            position: absolute;
            left: var(--circle-container-offset);
            top: var(--circle-container-offset);
            border-radius: var(--container-radius);
            -webkit-box-shadow: inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), 0 0 0 0.625em rgba(255, 255, 255, 0.1), 0 0 0 1.25em rgba(255, 255, 255, 0.1);
            box-shadow: inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), inset 0 0 0 3.375em rgba(255, 255, 255, 0.1), 0 0 0 0.625em rgba(255, 255, 255, 0.1), 0 0 0 1.25em rgba(255, 255, 255, 0.1);
            display: -webkit-box;
            display: -ms-flexbox;
            display: flex;
            -webkit-transition: var(--circle-transition);
            -o-transition: var(--circle-transition);
            transition: var(--circle-transition);
            pointer-events: none;
        }

        .theme-switch__sun-moon-container {
            pointer-events: auto;
            position: relative;
            z-index: 2;
            width: var(--sun-moon-diameter);
            height: var(--sun-moon-diameter);
            margin: auto;
            border-radius: var(--container-radius);
            background-color: var(--sun-bg);
            -webkit-box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #a1872a inset;
            box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #a1872a inset;
            -webkit-filter: drop-shadow(0.062em 0.125em 0.125em rgba(0, 0, 0, 0.25)) drop-shadow(0em 0.062em 0.125em rgba(0, 0, 0, 0.25));
            filter: drop-shadow(0.062em 0.125em 0.125em rgba(0, 0, 0, 0.25)) drop-shadow(0em 0.062em 0.125em rgba(0, 0, 0, 0.25));
            overflow: hidden;
            -webkit-transition: var(--transition);
            -o-transition: var(--transition);
            transition: var(--transition);
        }

        .theme-switch__moon {
            -webkit-transform: translateX(100%);
            -ms-transform: translateX(100%);
            transform: translateX(100%);
            width: 100%;
            height: 100%;
            background-color: var(--moon-bg);
            border-radius: inherit;
            -webkit-box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #969696 inset;
            box-shadow: 0.062em 0.062em 0.062em 0em rgba(254, 255, 239, 0.61) inset, 0em -0.062em 0.062em 0em #969696 inset;
            -webkit-transition: var(--transition);
            -o-transition: var(--transition);
            transition: var(--transition);
            position: relative;
        }

        .theme-switch__spot {
            position: absolute;
            top: 0.75em;
            left: 0.312em;
            width: 0.75em;
            height: 0.75em;
            border-radius: var(--container-radius);
            background-color: var(--spot-color);
            -webkit-box-shadow: 0em 0.0312em 0.062em rgba(0, 0, 0, 0.25) inset;
            box-shadow: 0em 0.0312em 0.062em rgba(0, 0, 0, 0.25) inset;
        }

        .theme-switch__spot:nth-of-type(2) {
            width: 0.375em;
            height: 0.375em;
            top: 0.937em;
            left: 1.375em;
        }

        .theme-switch__spot:nth-last-of-type(3) {
            width: 0.25em;
            height: 0.25em;
            top: 0.312em;
            left: 0.812em;
        }

        .theme-switch__clouds {
            width: 1.25em;
            height: 1.25em;
            background-color: var(--clouds-color);
            border-radius: var(--container-radius);
            position: absolute;
            bottom: -0.625em;
            left: 0.312em;
            -webkit-box-shadow: 0.937em 0.312em var(--clouds-color), -0.312em -0.312em var(--back-clouds-color), 1.437em 0.375em var(--clouds-color), 0.5em -0.125em var(--back-clouds-color), 2.187em 0 var(--clouds-color), 1.25em -0.062em var(--back-clouds-color), 2.937em 0.312em var(--clouds-color), 2em -0.312em var(--back-clouds-color), 3.625em -0.062em var(--clouds-color), 2.625em 0em var(--back-clouds-color), 4.5em -0.312em var(--clouds-color), 3.375em -0.437em var(--back-clouds-color), 4.625em -1.75em 0 0.437em var(--clouds-color), 4em -0.625em var(--back-clouds-color), 4.125em -2.125em 0 0.437em var(--back-clouds-color);
            box-shadow: 0.937em 0.312em var(--clouds-color), -0.312em -0.312em var(--back-clouds-color), 1.437em 0.375em var(--clouds-color), 0.5em -0.125em var(--back-clouds-color), 2.187em 0 var(--clouds-color), 1.25em -0.062em var(--back-clouds-color), 2.937em 0.312em var(--clouds-color), 2em -0.312em var(--back-clouds-color), 3.625em -0.062em var(--clouds-color), 2.625em 0em var(--back-clouds-color), 4.5em -0.312em var(--clouds-color), 3.375em -0.437em var(--back-clouds-color), 4.625em -1.75em 0 0.437em var(--clouds-color), 4em -0.625em var(--back-clouds-color), 4.125em -2.125em 0 0.437em var(--back-clouds-color);
            -webkit-transition: 0.5s cubic-bezier(0, -0.02, 0.4, 1.25);
            -o-transition: 0.5s cubic-bezier(0, -0.02, 0.4, 1.25);
            transition: 0.5s cubic-bezier(0, -0.02, 0.4, 1.25);
        }

        .theme-switch__stars-container {
            position: absolute;
            color: var(--stars-color);
            top: -100%;
            left: 0.312em;
            width: 2.75em;
            height: auto;
            -webkit-transition: var(--transition);
            -o-transition: var(--transition);
            transition: var(--transition);
        }

        /* actions */

        .theme-switch__checkbox:checked + .theme-switch__container {
            background-color: var(--container-night-bg);
        }

        .theme-switch__checkbox:checked + .theme-switch__container .theme-switch__circle-container {
            left: calc(100% - var(--circle-container-offset) - var(--circle-container-diameter));
        }

        .theme-switch__checkbox:checked + .theme-switch__container .theme-switch__circle-container:hover {
            left: calc(100% - var(--circle-container-offset) - var(--circle-container-diameter) - 0.187em)
        }

        .theme-switch__circle-container:hover {
            left: calc(var(--circle-container-offset) + 0.187em);
        }

        .theme-switch__checkbox:checked + .theme-switch__container .theme-switch__moon {
            -webkit-transform: translate(0);
            -ms-transform: translate(0);
            transform: translate(0);
        }

        .theme-switch__checkbox:checked + .theme-switch__container .theme-switch__clouds {
            bottom: -4.062em;
        }

        .theme-switch__checkbox:checked + .theme-switch__container .theme-switch__stars-container {
            top: 50%;
            -webkit-transform: translateY(-50%);
            -ms-transform: translateY(-50%);
            transform: translateY(-50%);
        }

        @media (max-width: 480px) {
            .card-container {
                max-width: 100%;
            }

            .card-header {
                padding: 30px 20px 80px;
            }
            
            .card-body {
                padding: 60px 20px 20px;
            }
            
            .header {
                padding: 0 1rem;
            }
            
            .controls {
                gap: 1rem;
            }
        }