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

body {
    width: 100%;
    min-height: 100vh;
    background-color: #fff;
    color: #333;
    font-family: 'Poppins', sans-serif;
    background-image: url(img/background/victor-freitas-vqDAUejnwKw-unsplash.jpg);
    background-repeat: no-repeat;
    background-size: 100%;
}

nav {
    background-color: #fff;
    padding: 15px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1800px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
}

.logo {
    background-color: #ff0000;
    color: white;
    padding: 10px 20px;
    font-size: 30px;
    font-weight: 900;
    letter-spacing: 5px;
    text-decoration: none;
    display: inline-block;
}

.nav-links {
    display: flex;
    gap: 155px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-size: 19px;
    font-weight: 600;
    letter-spacing: 1px;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #ff0000;
}

nav .btn {
    background-color: #ffffff;
    border: 2px solid #000000;
    border-radius: 7px;
    padding: 12px 22px;
    font-size: 22px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    white-space: nowrap;
}

nav .btn:hover {
    background-color: #fffb00;
    color: rgb(0, 0, 0);
}

.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 50%;
    left: 0;
    background-color: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    list-style: none;
    padding: 10px 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.dropdown-menu li {
    padding: 0;
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    color: #333;
    transition: all 0.3s;
}

.dropdown-menu a:hover {
    background-color: #f5f5f5;
    color: #ff0000;
    padding-left: 25px;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.grid-container {
    max-width: 1400px;
    margin: 30px auto;
    margin-left: 0px;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-left: 300px;
}

.grid-item {
    background-color: white;
    padding: 60px 40px;
    box-shadow: 60px 10px 90px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    min-height: 350px;
}

.drop-down-second {
    position: relative;
}

.drop-down-menu-second {
    position: absolute;
    top: 50%;
    background-color: white;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    list-style: none;
    padding: 10px 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.drop-down-menu-second li {
    padding: 0;
}

.drop-down-menu-second a {
    display: block;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 500;
    text-transform: none;
    letter-spacing: 0;
    color: #333;
    transition: all 0.3s;
}

.drop-down-menu-second a:hover {
    background-color: #f5f5f5;
    color: #ff0000;
    padding-left: 25px;
}

.drop-down-second:hover .drop-down-menu-second {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.calculator-container {
    max-width: 1000px;
    margin: 0 auto;
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-top: 150px;
}

h1 {
    font-size: 32px;
    font-weight: 700;
    color: #2a2a2a;
    margin-bottom: 30px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.instructions {
    margin-bottom: 30px;
}

.instructions ol {
    padding-left: 20px;
}

.instructions li {
    margin-bottom: 8px;
    font-size: 16px;
    color: #333;
    font-weight: 500;
}

.example-text {
    margin-top: 20px;
    font-size: 16px;
    color: #666;
    line-height: 1.6;
}

.calculator-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-top: 40px;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

input[type='number'] {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    font-family: 'Poppins', sans-serif;
    border: 1px solid #ddd;
    border-radius: 4px;
    transition: border-color 0.3s;
}

input[type='number']:focus {
    outline: none;
    border-color: #d32f2f;
}

.button-row {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.calculate-btn {
    background-color: #d32f2f;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    text-transform: uppercase;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.calculate-btn:hover {
    background-color: #b71c1c;
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toggle-label {
    font-size: 14px;
    color: #666;
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 26px;
    background-color: #ccc;
    border-radius: 13px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.toggle-switch.active {
    background-color: #4caf50;
}

.toggle-slider {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

.toggle-switch.active .toggle-slider {
    transform: translateX(24px);
}

.result-section {
    background-color: #f5f5f5;
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.result-title {
    font-size: 16px;
    color: #666;
    text-transform: uppercase;
    margin-bottom: 15px;
    letter-spacing: 1px;
}

.result-value {
    font-size: 72px;
    font-weight: 800;
    color: #2a2a2a;
    margin-bottom: 10px;
    line-height: 1;
}

.result-disclaimer {
    font-size: 13px;
    color: #999;
    margin-bottom: 20px;
}

.footer {
    background: #2a2a2a;
    padding: 15px 0;
    text-align: center;
    margin-top: 171px;
}

.footer-info {
    max-width: 1500px;
    margin: 0 auto;
    padding: 20px;
    color: #ffffff;
    font-size: 20px;
}

.footer-info p {
    margin: 25px 0;
}

.footer-info .info {
    font-size: 16px;
    color: #ffffff;
    margin-top: 25px;
}

@media screen and (max-width: 1024px) {
    body {
        background-size: cover;
        background-attachment: fixed;
    }

    .nav-container {
        padding: 0 20px;
    }

    .nav-links {
        gap: 80px;
    }

    .logo {
        font-size: 24px;
        padding: 8px 16px;
        letter-spacing: 3px;
    }

    .nav-links a {
        font-size: 16px;
    }

    nav .btn {
        padding: 10px 18px;
        font-size: 18px;
    }

    .calculator-container {
        max-width: 90%;
        padding: 30px;
        margin-top: 120px;
    }

    h1 {
        font-size: 28px;
        margin-bottom: 25px;
    }

    .instructions li {
        font-size: 15px;
    }

    .example-text {
        font-size: 15px;
    }

    .calculator-wrapper {
        gap: 30px;
        margin-top: 30px;
    }

    .result-value {
        font-size: 60px;
    }

    .footer {
        margin-top: 100px;
    }

    .footer-info {
        font-size: 18px;
        padding: 15px;
    }

    .dropdown-menu,
    .drop-down-menu-second {
        min-width: 180px;
        left: -20px;
    }
}

@media screen and (max-width: 767px) {
    body {
        background-size: cover;
        background-position: center;
        background-attachment: fixed;
    }

    .nav-container {
        padding: 0 15px;
        flex-direction: column;
        gap: 15px;
    }

    .logo {
        font-size: 22px;
        padding: 8px 14px;
        letter-spacing: 2px;
        margin-top: 5px;
    }

    .nav-links {
        flex-direction: column;
        gap: 15px;
        width: 100%;
        align-items: center;
    }

    .nav-links li {
        width: 100%;
        text-align: center;
    }

    .nav-links a {
        font-size: 16px;
        display: block;
        padding: 12px 0;
    }

    nav .btn {
        width: 100%;
        margin-top: 10px;
        padding: 12px;
        font-size: 18px;
    }

    .dropdown-menu,
    .drop-down-menu-second {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        display: none;
        background-color: #f8f8f8;
        margin-top: 5px;
        border-radius: 5px;
        padding: 5px 0;
        min-width: auto;
    }

    .dropdown:hover .dropdown-menu,
    .drop-down-second:hover .drop-down-menu-second {
        display: block;
    }

    .dropdown-menu a,
    .drop-down-menu-second a {
        padding: 10px 15px;
        font-size: 15px;
    }

    .dropdown-menu a:hover,
    .drop-down-menu-second a:hover {
        padding-left: 20px;
    }

    main {
        padding: 20px 15px;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .calculator-container {
        max-width: 100%;
        padding: 25px 20px;
        margin-top: 30px;
        width: 100%;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

    h1 {
        font-size: 22px;
        margin-bottom: 20px;
        text-align: center;
        letter-spacing: 1px;
    }

    .instructions {
        margin-bottom: 25px;
    }

    .instructions ol {
        padding-left: 25px;
        margin-bottom: 15px;
    }

    .instructions li {
        font-size: 15px;
        margin-bottom: 8px;
        line-height: 1.4;
    }

    .example-text {
        font-size: 14px;
        line-height: 1.5;
        text-align: center;
        margin-top: 15px;
    }

    .calculator-wrapper {
        grid-template-columns: 1fr;
        gap: 25px;
        margin-top: 25px;
    }

    .input-section {
        gap: 15px;
    }

    input[type='number'] {
        padding: 12px;
        font-size: 16px;
        text-align: center;
    }

    input[type='number']::placeholder {
        font-size: 14px;
    }

    .button-row {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
    }

    .calculate-btn {
        width: 100%;
        padding: 14px;
        font-size: 16px;
        order: 2;
    }

    .toggle-container {
        justify-content: center;
        order: 1;
        margin-bottom: 10px;
    }

    .result-section {
        padding: 30px 20px;
    }

    .result-title {
        font-size: 14px;
        margin-bottom: 15px;
    }

    .result-value {
        font-size: 48px;
        margin-bottom: 10px;
    }

    .result-value span {
        font-size: 24px;
    }

    .result-disclaimer {
        font-size: 12px;
    }

    .footer {
        margin-top: 50px;
        padding: 10px 0;
    }

    .footer-info {
        font-size: 16px;
        padding: 15px 10px;
    }

    .footer-info p {
        margin: 15px 0;
    }

    .footer-info .info {
        font-size: 14px;
        margin-top: 15px;
    }
}

.burger-btn {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    position: relative;
    transition: none;
}

.burger-btn:hover {
    background-color: transparent;
    transform: none;
}

.burger-line {
    width: 100%;
    height: 3px;
    background-color: #333;
    border-radius: 2px;
}

@media screen and (max-width: 767px) {
    .burger-btn {
        display: flex;
        position: absolute;
        right: 30px;
        top: 26%;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: white;
        flex-direction: column;
        padding: 80px 20px 30px;
        gap: 0;
        transition: right 0.4s ease;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        z-index: 1000;
        overflow-y: auto;
    }

    .nav-links.active {
        right: 0;
    }

    .nav-links li {
        width: 100%;
        border-bottom: 1px solid #eee;
    }

    .nav-links li:last-child {
        border-bottom: none;
        margin-top: 20px;
    }

    .nav-links a {
        padding: 15px 0;
        text-align: left;
        font-size: 18px;
    }

    .dropdown-menu,
    .drop-down-menu-second {
        position: static;
        display: none;
        background-color: #f9f9f9;
        box-shadow: none;
        padding: 0;
        margin: 0;
        width: 100%;
    }

    .dropdown:hover .dropdown-menu,
    .drop-down-second:hover .drop-down-menu-second {
        display: none;
    }

    .dropdown.active .dropdown-menu,
    .drop-down-second.active .drop-down-menu-second {
        display: block;
    }

    .dropdown-menu a,
    .drop-down-menu-second a {
        padding: 12px 20px;
        font-size: 16px;
        border-bottom: 1px solid #eee;
    }

    .dropdown-menu a:last-child,
    .drop-down-menu-second a:last-child {
        border-bottom: none;
    }

    .dropdown > a,
    .drop-down-second > a {
        position: relative;
        padding-right: 30px;
    }

    .dropdown > a::after,
    .drop-down-second > a::after {
        content: '›';
        position: absolute;
        right: 10px;
        top: 50%;
        transform: translateY(-50%) rotate(90deg);
        font-size: 20px;
        transition: transform 0.3s;
    }

    .dropdown.active > a::after,
    .drop-down-second.active > a::after {
        transform: translateY(-50%) rotate(-90deg);
    }

    .nav-links .btn {
        width: 100%;
        margin-top: 10px;
        padding: 15px;
        text-align: center;
    }

    .nav-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }

    .nav-overlay.active {
        display: block;
    }

    .nav-container {
        position: relative;
    }

    .logo {
        margin: 0px 180px 0px 0;
        font-size: 20px;
        padding: 8px 15px;
        letter-spacing: 2px;
    }
}

@media screen and (min-width: 768px) and (max-width: 1024px) {
    .burger-btn {
        display: none;
    }
}