/* General */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f7fb;
    color: #333;
}

/* Header */
header {
    background: #4f46e5;
    color: white;
    text-align: center;
    padding: 20px;
}

header h1 {
    margin: 0;
}

/* Navbar */
nav {
    margin-top: 15px;
}

nav a {
    text-decoration: none;
    color: white;
    margin: 0 15px;
    font-weight: bold;
    padding: 8px 15px;
    border-radius: 5px;
}

nav a:hover,
nav a.active {
    background: white;
    color: #4f46e5;
}

/* Main */
main {
    width: 80%;
    margin: 40px auto;
}

/* Card */
section,
.quiz-box {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    text-align: center;
}

/* Buttons */
button {
    background: #4f46e5;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    margin: 8px;
    font-size: 16px;
}

button:hover {
    background: #3730a3;
}

/* Footer */
footer {
    text-align: center;
    background: #222;
    color: white;
    padding: 15px;
    margin-top: 40px;
}

/* Quiz Options */
.option-btn {
    width: 100%;
    padding: 12px;
    margin: 10px 0;
    background: #0d6efd;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
}

.option-btn:hover {
    background: #0b5ed7;
}

/* Dark Mode */
.dark-mode {
    background: #121212;
    color: white;
}

.dark-mode header {
    background: #000;
}

.dark-mode footer {
    background: #000;
}

.dark-mode section,
.dark-mode .quiz-box {
    background: #1f1f1f;
    color: white;
}

.dark-mode button {
    background: #555;
}

#themeBtn {
    position: fixed;
    right: 20px;
    bottom: 20px;
}