:root {
    --bg-color: #f7f7f7;
    --text-color: #333;
    --container-bg: #fff;
    --input-border-color: #ddd;
    --input-focus-border-color: #007bff;
    --secondary-text-color: #666;
    --label-color: #444;
    --btn-bg: #007bff;
    --btn-text-color: #fff;
    --btn-hover-bg: #0056b3;
    --result-bg: #f0f8ff;
    --result-text-color: #007bff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-light-color: rgba(0, 0, 0, 0.05);
    --btn-shadow-color: rgba(0, 123, 255, 0.3);
    --btn-hover-shadow-color: rgba(0, 123, 255, 0.4);
}

[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --container-bg: #2c2c2c;
    --input-border-color: #555;
    --input-focus-border-color: #007bff;
    --secondary-text-color: #aaa;
    --label-color: #ccc;
    --btn-bg: #007bff;
    --btn-text-color: #fff;
    --btn-hover-bg: #0056b3;
    --result-bg: #1e2a38;
    --result-text-color: #00aaff;
    --shadow-color: rgba(0, 0, 0, 0.4);
    --shadow-light-color: rgba(0, 0, 0, 0.2);
    --btn-shadow-color: rgba(0, 123, 255, 0.2);
    --btn-hover-shadow-color: rgba(0, 123, 255, 0.3);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23e0e0e0' fill-opacity='0.1' fill-rule='evenodd'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
    transition: background-color 0.3s, color 0.3s;
}

.disclaimer {
    background-color: var(--result-bg);
    color: var(--secondary-text-color);
    padding: 10px;
    text-align: center;
    font-size: 0.8rem;
    width: 100%;
    box-sizing: border-box;
}

.top-bar {
    position: absolute;
    top: 40px; /* Adjusted for disclaimer */
    right: 20px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.lang-switcher {
    display: flex;
    gap: 5px;
}

.lang-btn {
    background: transparent;
    border: 1px solid var(--input-border-color);
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

.top-bar-btn {
    background: transparent;
    border: 1px solid var(--input-border-color);
    color: var(--text-color);
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

.top-bar-btn:hover {
    background-color: var(--btn-bg);
    color: var(--btn-text-color);
}

/* Modal Styles */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 90%;
    max-width: 450px;
    position: relative;
}

.close-btn {
    color: var(--secondary-text-color);
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close-btn:hover,
.close-btn:focus {
    color: var(--text-color);
    text-decoration: none;
}

.theme-toggle-container {
    position: static;
}

.theme-toggle-btn {
    background: var(--container-bg);
    border: 1px solid var(--input-border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 2px 5px var(--shadow-color);
}


.calculator-container, .container {
    background: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 20px 40px var(--shadow-color), 0 10px 20px var(--shadow-light-color);
    text-align: center;
    max-width: 400px;
    width: 100%;
    box-sizing: border-box;
    transition: background-color 0.3s;
}

.back-btn {
    display: block;
    margin-bottom: 20px;
    background-color: var(--result-bg);
    color: var(--result-text-color);
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s;
    text-align: center;
}

.back-btn:hover {
    background-color: var(--btn-hover-bg);
    color: var(--btn-text-color);
}

.supplement-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
    justify-content: center;
}

.supplement-item {
    background-color: var(--result-bg);
    color: var(--result-text-color);
    padding: 15px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s;
    width: calc(20% - 10px); /* 5 items per row with gap */
    box-sizing: border-box;
    text-align: center;
}

.supplement-item:hover {
    background-color: var(--btn-hover-bg);
    color: var(--btn-text-color);
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-color);
}


p {
    color: var(--secondary-text-color);
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 25px; /* Increased margin for better spacing */
    text-align: left;
    position: relative; /* For potential icons or enhanced styling */
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--label-color);
    font-size: 0.95rem; /* Slightly smaller label */
}

.input-group input[type="number"] {
    width: 100%;
    padding: 14px 15px; /* Increased padding */
    border: 1px solid var(--input-border-color);
    background-color: var(--container-bg); /* Use container background for input */
    color: var(--text-color);
    border-radius: 10px; /* More rounded corners */
    font-size: 1.05rem; /* Slightly larger text */
    box-sizing: border-box;
    transition: border-color 0.3s, box-shadow 0.3s;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05); /* Subtle shadow for depth */
}

.input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--input-focus-border-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2); /* Focus ring effect */
}

/* Styles for content on detail pages */
.content {
    margin-top: 20px;
    text-align: left;
    padding: 15px 20px;
    background-color: var(--container-bg);
    border-radius: 15px;
    box-shadow: 0 5px 15px var(--shadow-color);
}

.content h2 {
    font-size: 1.4rem;
    color: var(--text-color);
    margin-top: 20px;
    margin-bottom: 10px;
    border-bottom: 1px solid var(--input-border-color);
    padding-bottom: 5px;
}

.content p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--secondary-text-color);
    margin-bottom: 15px;
}

.gender-options {
    display: flex;
    justify-content: space-around;
}

.gender-option {
    display: flex;
    align-items: center;
}

.gender-option input[type="radio"] {
    margin-right: 8px;
}

.calculate-btn {
    background: var(--btn-bg);
    color: var(--btn-text-color);
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s, box-shadow 0.3s;
    box-shadow: 0 5px 15px var(--btn-shadow-color);
}

.calculate-btn:hover {
    background: var(--btn-hover-bg);
    box-shadow: 0 8px 20px var(--btn-hover-shadow-color);
}

.result-container {
    margin-top: 30px;
    padding: 20px;
    background: var(--result-bg);
    border-radius: 8px;
    transition: background-color 0.3s;
}

.result-container h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
}

.result-container p {
    font-size: 2rem;
    font-weight: 600;
    color: var(--result-text-color);
    margin: 10px 0 0;
}

@media (max-width: 480px) {
    .calculator-container {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
    }
}