:root {
    --bg-color-light: #f0f2f5;
    --text-color-light: #333;
    --container-bg-light: #ffffff;
    --button-bg-light: #007bff;
    --button-text-light: #fff;
    --input-bg-light: #fff;
    --input-border-light: #ccc;
    --result-bg-light: #f9f9f9;
    --error-color-light: #d93025;
    --h3-color-light: #555;

    --bg-color-dark: #1a1a1a;
    --text-color-dark: #f0f0f0;
    --container-bg-dark: #2c2c2c;
    --button-bg-dark: #0056b3;
    --button-text-dark: #f0f0f0;
    --input-bg-dark: #333;
    --input-border-dark: #555;
    --result-bg-dark: #333;
    --error-color-dark: #ff4d4d;
    --h3-color-dark: #aaa;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.converter-container {
    background: var(--container-bg-light);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 400px;
}

h1 {
    color: var(--text-color-light);
    margin-bottom: 1.5rem;
}

.input-section {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

#amount-input {
    flex-grow: 1;
    padding: 0.75rem;
    border: 1px solid var(--input-border-light);
    background-color: var(--input-bg-light);
    color: var(--text-color-light);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

#amount-input:focus {
    border-color: #007bff;
    outline: none;
}

#convert-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--button-bg-light);
    color: var(--button-text-light);
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

#convert-btn:hover {
    background-color: #0056b3;
}

#result-container {
    text-align: left;
}

#result-container h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--h3-color-light);
}

#result-container ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
}

#result-container li {
    background: var(--result-bg-light);
    padding: 0.75rem;
    border-radius: 6px;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: space-between;
    font-size: 1.1rem;
}

#result-container li span:first-child {
    font-weight: 500;
}

#error-container {
    color: var(--error-color-light);
    margin-top: 1rem;
    font-weight: 500;
}

#theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem;
    background-color: var(--container-bg-light);
    border: 1px solid var(--input-border-light);
    border-radius: 4px;
    cursor: pointer;
}

/* Dark Mode */
body.dark-mode {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}

body.dark-mode .converter-container {
    background: var(--container-bg-dark);
}

body.dark-mode h1 {
    color: var(--text-color-dark);
}

body.dark-mode #amount-input {
    background-color: var(--input-bg-dark);
    color: var(--text-color-dark);
    border: 1px solid var(--input-border-dark);
}

body.dark-mode #convert-btn {
    background-color: var(--button-bg-dark);
    color: var(--button-text-dark);
}

body.dark-mode #result-container h3 {
    color: var(--h3-color-dark);
}

body.dark-mode #result-container li {
    background: var(--result-bg-dark);
}

body.dark-mode #error-container {
    color: var(--error-color-dark);
}

body.dark-mode #theme-toggle {
    background-color: var(--container-bg-dark);
    color: var(--text-color-dark);
    border: 1px solid var(--input-border-dark);
}