/* Global Styles */
:root {
    --primary-color: #673ab7; /* Modern purple */
    --primary-darker: #512da8; /* Darker purple */
    --secondary-color: #9c27b0; /* Another shade of purple */
    --text-color: #333; /* Dark grey */
    --bg-color: #f5f5f5; /* Light grey background */
    --card-bg-color: #fff;
    --border-color: #ddd; /* Lighter grey border */
    --box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* More pronounced shadow */
    --transition-duration: 0.3s;
    --hover-transition-duration: 0.2s;

    /* Dark Theme */
    --dark-text-color: #eee;
    --dark-bg-color: #121212; /* Darker background */
    --dark-card-bg-color: #1e1e1e; /* Darker card */
    --dark-border-color: #333;
    --dark-input-bg-color: #252525;
    --dark-input-text-color: #eee;
    --navbar-height: 70px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-duration), color var(--transition-duration);
    min-height: 100vh;
    overflow-x: hidden;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}


/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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


/* Navbar */
.navbar {
    background-color: var(--card-bg-color);
    color: var(--text-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--navbar-height);
    transition: background-color var(--transition-duration);
    border-bottom: 1px solid var(--border-color);
}


.navbar h1 {
    font-size: 1.75rem;
    margin: 0;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: color var(--transition-duration);
}



/* Navigation Links */
.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 400;
    transition: color var(--hover-transition-duration);
}

.nav-links a:hover {
    color: var(--primary-color);
}



/* Theme Toggle */
.theme-toggle {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
    transition: color var(--transition-duration), transform var(--transition-duration);
}


.theme-toggle:hover {
    color: var(--primary-color);
    transform: scale(1.1);
}



/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    transition: transform var(--hover-transition-duration);
}


.hamburger:hover {
    transform: scale(1.1);
}

.hamburger div {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 4px 0;
    border-radius: 2px;
    transition: background-color var(--transition-duration);
}


/* Main Content */
main {
    padding: 2rem;
}

#home {
    min-height: calc(100vh - var(--navbar-height) - 4rem);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: stretch;
    animation: fadeIn 0.5s ease-out;
}


.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--card-bg-color);
    border-radius: 0.5rem;
    box-shadow: var(--box-shadow);
    padding: 2rem;
    display: none;
    transition: background-color var(--transition-duration);
    animation: fadeIn 0.5s ease-out;
}


/* Section Headings */
h2 {
    color: var(--text-color);
    font-size: 1.75rem;
    margin-bottom: 1.25rem;
    text-align: center;
    font-weight: 500;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.75rem;
    transition: border-bottom var(--hover-transition-duration);
}



h2:hover {
    border-bottom-color: var(--primary-darker);
}




/* Form Styling */
.form-group {
    margin-bottom: 0.6rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    font-size: 1rem;
    margin-bottom: 0.4rem;
    color: var(--text-color);
    transition: color var(--transition-duration);
}


.form-group input,
.form-group select {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 0.3rem;
    font-size: 0.95rem;
    transition: border-color var(--transition-duration), box-shadow var(--transition-duration);
    background-color: var(--card-bg-color);
    color: var(--text-color);
}


.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}



.unit-row {
    display: flex;
    gap: 0.4rem;
    align-items: center;
}

.unit-row select {
    width: auto;
    padding: 0.3rem;
    font-size: 0.8rem;
    max-width: 70px;
    cursor: pointer;
    transition: border-color var(--transition-duration);
}



.unit-row select:hover {
    border-color: var(--primary-color);
}


.unit-row input {
    flex-grow: 1;
}


/* Button Styles */
button {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    border-radius: 0.2rem;
    cursor: pointer;
    transition: background-color var(--transition-duration), transform var(--hover-transition-duration), box-shadow var(--hover-transition-duration);
    box-shadow: var(--box-shadow);
    text-transform: uppercase;
    font-weight: 500;
    position: relative;
    overflow: hidden;
}




button:hover {
    background-color: var(--primary-darker);
    transform: translateY(-2px);
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
}


button:active {
    transform: translateY(0);
    box-shadow: none;
}


button:after { /* ripple effect */
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    opacity: 0;
    transition: all 0.5s ease;
}

button:active:after {
    transform: translate(-50%, -50%) scale(3);
    opacity: 1;
}




/* Result Container */
.button-result-container {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    margin-top: 1rem;
}



#result {
    font-size: 1.1rem;
    color: #28a745;
    font-weight: 500;
    margin-top: 0.5rem;
    text-align: right;
    transition: color var(--transition-duration);
}



/* History Display */
#historySection {
    overflow-x: auto;
}


#historyTable {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    box-shadow: var(--box-shadow);
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid var(--border-color);
}



#historyTable thead {
    background-color: var(--primary-color);
    color: #fff;
    font-weight: 500;
}


#historyTable th,
#historyTable td {
    padding: 0.6rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    transition: background-color var(--hover-transition-duration), color var(--hover-transition-duration);
}




#historyTable tbody tr:nth-child(even) {
    background-color: var(--bg-color);
}


#historyTable tbody tr:hover {
    background-color: rgba(0, 123, 255, 0.05);
}


#historyTable td {
    font-size: 0.8rem;
    color: var(--text-color);
    transition: background-color var(--transition-duration), color var(--transition-duration);
}




/* History Buttons */
.history-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 0.8rem;
    margin-top: 1.2rem;
}



/* Contact Section */
.contact-info {
    margin-top: 2.5rem;
    padding: 1.2rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-color);
    border-top: 1px solid var(--border-color);
    transition: background-color var(--transition-duration), color var(--transition-duration);
}


.contact-info h2 {
    font-size: 1.5rem;
    margin-bottom: 0.6rem;
}


.contact-info p {
    margin: 0.2rem 0;
    transition: color var(--transition-duration);
}



.contact-info a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--hover-transition-duration);
}


.contact-info a:hover {
    text-decoration: underline;
    color: var(--primary-darker);
}


.contact-info .name {
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: 0.4rem;
    transition: color var(--transition-duration);
}


.profile-image {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    margin: 0 auto 0.8rem;
    box-shadow: var(--box-shadow);
    transition: transform var(--hover-transition-duration), box-shadow var(--hover-transition-duration);
}




.profile-image:hover {
    transform: scale(1.1);
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.15);
}


.profile-link {
    text-decoration: none;
}




/* Validation Styles */
.error {
    color: #dc3545;
    font-size: 0.7rem;
    margin-top: 0.2rem;
    transition: color var(--transition-duration);
}




/* Dark Mode Styles */
[data-theme="dark"] {
    --text-color: var(--dark-text-color);
    --bg-color: var(--dark-bg-color);
    --card-bg-color: var(--dark-card-bg-color);
    --border-color: var(--dark-border-color);
    --form-label-color: #999;
}


[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select {
    background-color: var(--dark-input-bg-color);
    color: var(--dark-input-text-color);
    border-color: var(--dark-border-color);
}


[data-theme="dark"] .navbar {
    box-shadow: none;
}




/* Mobile Styles */
@media (max-width: 768px) {

    /* General */
    main {
        padding: 1rem 0;
    }

    .container {
        padding: 1rem;
        border-radius: 0;
        box-shadow: none;
    }


    /* Nav Bar for Mobile Devices */
    .navbar {
        flex-direction: column;
        align-items: flex-start;
        padding: 0.5rem 1rem;
    }


    .navbar h1 {
        margin-bottom: 0.5rem;
        font-size: 1.3rem;
    }



    .nav-links {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        display: none;
        animation: fadeIn 0.3s ease-out forwards;
        background-color: var(--card-bg-color);
        box-shadow: var(--box-shadow);
        margin-top: 0.5rem;
        border-radius: 0.5rem;
        overflow: hidden;
        position: absolute;
        top: 100%;
        left: 0;
    }


    .nav-links.active {
        display: flex;
    }


    .nav-links a {
        padding: 0.75rem 1rem;
        border-bottom: 1px solid var(--border-color);
        width: 100%;
        transition: color var(--hover-transition-duration);
        font-size: 1rem;
        text-align: left;
    }



    .nav-links a:hover {
        color: var(--primary-color);
    }


    .hamburger {
        display: flex;
        position: absolute;
        top: 0.5rem;
        right: 1rem;
        padding: 0.5rem;
        border-radius: 0.3rem;
        background-color: var(--bg-color);
    }



    .hamburger div {
        width: 22px;
        height: 2px;
        margin: 3px 0;
    }


    /* Section Headings */
    h2 {
        font-size: 1.5rem;
        margin-bottom: 1rem;
        padding-bottom: 0.5rem;
    }



    /* Form Element */
    .form-group {
        margin-bottom: 0.8rem;
    }



    .form-group label {
        font-size: 0.9rem;
    }




    .form-group input,
    .form-group select {
        padding: 0.5rem;
        font-size: 0.9rem;
    }


    /* History Section */
    #historySection {
        overflow-x: auto;
    }



    #historyTable th,
    #historyTable td {
        padding: 0.5rem;
        font-size: 0.75rem;
    }




    /* Button and Results */
    .button-result-container {
        flex-direction: column;
        align-items: stretch;
        gap: 0.6rem;
    }




    button {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }



    #result {
        margin-left: 0;
        text-align: center;
        font-size: 1rem;
    }




    /* Contact Section */
    .contact-info {
        margin-top: 1.5rem;
        padding: 0.8rem;
    }


    .contact-info h2 {
        font-size: 1.3rem;
    }




    .contact-info .name {
        font-size: 1.5rem;
    }


    .contact-info p,
    .contact-info a {
        font-size: 0.8rem;
    }



    .contact-info .profile-image {
        width: 70px;
        height: 70px;
    }


    /* Theme Toggle */
    .theme-toggle {
        position: static;
        margin-left: 0;
        margin-top: 0.5rem;
    }



    /* Home Form */
    .home-form {
        flex-direction: column;
        gap: 1rem;
    }


    .form-column {
        width: 100%;
    }



    .form-group.card {
        padding: 0.8rem;
        margin-bottom: 1rem;
    }



    .history-buttons {
        justify-content: center;
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }
}

.home-form {
    display: flex;
    gap: 1.5rem;
}


.form-column {
    width: 100%;
}



.form-group.card {
    background-color: var(--card-bg-color);
    border-radius: 0.5rem;
    box-shadow: var(--box-shadow);
    padding: 1rem;
    margin-bottom: 1.2rem;
    transition: background-color var(--transition-duration), transform var(--hover-transition-duration), box-shadow var(--hover-transition-duration);
    animation: fadeIn 0.5s ease-out;
    width: 100%;
    border: 1px solid var(--border-color);
}




.form-group.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
}



/* Drag and Drop Styles */
.draggable {
    cursor: grab;
}

.hovered {
    border: 2px dashed var(--primary-color);
}




/* Styles for dragging history rows */
#historyTable tbody tr.dragging {
    opacity: 0.5;
    background-color: #ddd;
}




#historyTable tbody tr {
    cursor: grab;
}



.draggable-container {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    width: 100%;
}

/* Spinner Styles */
.spinner {
    margin-left: 0.5rem; /* Adjust as needed */
}

.spinner i { /* Style the spinner icon */
    font-size: 1rem; /* Adjust icon size */
    color: #fff; /* Set icon color */
}