/* Root Variables */
:root {
    --background-color: #f0f8ff;
    --text-color: #333;
    --primary-color: #2a9df4;
    --primary-hover-color: #217ec1;
    --input-border-color: #ccc;
    --input-border-focus-color: #2a9df4;
    --button-color: #ffffff;
    --footer-background: #333;
    --footer-text-color: #ffffff;
}

/* Dark Mode */
[data-theme="dark"] {
    --background-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #4f8eda;
    --primary-hover-color: #3b6fa4;
    --input-border-color: #555;
    --input-border-focus-color: #4f8eda;
    --button-color: #e0e0e0;
    --footer-background: #1a1a1a;
    --footer-text-color: #999999;
}

/* General Styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: var(--background-color);
    color: var(--text-color);
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: var(--button-color);
}

header .logo img {
    width: 50px;
    height: 50px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 15px;
    margin: 0;
}

nav ul li a {
    text-decoration: none;
    color: var(--button-color);
    font-weight: bold;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary-hover-color);
}

nav ul li a.active {
    text-decoration: underline;
    color: var(--primary-hover-color);
}

/* Main Section */
main {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 80vh;
    padding: 20px;
}

.signin-section {
    background-color: var(--button-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 90%;
    max-width: 350px;
}

.signin-section h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.signin-form label {
    display: block;
    text-align: left;
    margin-bottom: 5px;
    font-weight: bold;
    color: var(--text-color);
}

.signin-form input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--input-border-color);
    border-radius: 5px;
    outline: none;
    transition: border-color 0.3s;
}

.signin-form input:focus {
    border-color: var(--input-border-focus-color);
}

.signin-form button {
    width: 100%;
    padding: 10px;
    background-color: var(--primary-color);
    color: var(--button-color);
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.signin-form button:hover {
    background-color: var(--primary-hover-color);
    transform: scale(1.05);
}

.signin-form button:active {
    transform: scale(0.95);
}

.signin-form a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

.signin-form a:hover {
    color: var(--primary-hover-color);
    text-decoration: underline;
}

/* Footer */
footer {
    text-align: center;
    padding: 10px 0;
    background-color: var(--footer-background);
    color: var(--footer-text-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .signin-section {
        width: 100%;
        padding: 20px;
    }

    nav ul {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .signin-section h2 {
        font-size: 18px;
    }

    .signin-form button {
        font-size: 14px;
    }

    .signin-form input {
        font-size: 14px;
    }
}