:root {
    --background-color-light: #f4f7f6;
    --text-color-light: #333;
    --primary-color-light: #007bff;
    --secondary-color-light: #6c757d;
    --border-color-light: #ddd;
    --card-background-light: #fff;

    --background-color-dark: #222;
    --text-color-dark: #eee;
    --primary-color-dark: #66b3ff;
    --secondary-color-dark: #adb5bd;
    --border-color-dark: #555;
    --card-background-dark: #333;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
    background-color: var(--background-color-light);
    color: var(--text-color-light);
}

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

header {
    background-color: var(--primary-color-light);
    color: white;
    padding: 1rem;
    text-align: center;
}

body.dark-mode header {
    background-color: var(--primary-color-dark);
}

nav {
    display: flex;
    justify-content: center;
    gap: 15px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

nav button#theme-toggle {
    background: none;
    border: 1px solid white;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s;
}

nav button#theme-toggle:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

main {
    padding: 20px;
    max-width: 800px;
    margin: 20px auto;
    background-color: var(--card-background-light);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

body.dark-mode main {
    background-color: var(--card-background-dark);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

h1, h2 {
    color: var(--primary-color-light);
}

body.dark-mode h1, body.dark-mode h2 {
    color: var(--primary-color-dark);
}

form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

label {
    font-weight: bold;
}

input[type="text"],
input[type="password"],
textarea {
    padding: 10px;
    border: 1px solid var(--border-color-light);
    border-radius: 4px;
    background-color: var(--background-color-light);
    color: var(--text-color-light);
}

body.dark-mode input[type="text"],
body.dark-mode input[type="password"],
body.dark-mode textarea {
    border: 1px solid var(--border-color-dark);
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

button[type="submit"] {
    background-color: var(--primary-color-light);
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button[type="submit"]:hover {
    background-color: #0056b3;
}

body.dark-mode button[type="submit"] {
    background-color: var(--primary-color-dark);
}

body.dark-mode button[type="submit"]:hover {
    background-color: #4a90d9;
}

.error-message {
    color: red;
    margin-bottom: 10px;
}

.success-message {
    color: green;
    margin-bottom: 10px;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    background-color: var(--background-color-light);
    border: 1px solid var(--border-color-light);
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
}

body.dark-mode li {
    background-color: var(--background-color-dark);
    border: 1px solid var(--border-color-dark);
}

.report-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color-light);
}

body.dark-mode .report-section {
    border-top: 1px solid var(--border-color-dark);
}