body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: #F5F5DC; /* Beige - a muted base color */
    color: #4A3B31; /* Dark brown for text - coffee bean color */
    line-height: 1.6;
}

header {
    background-color: #A07855; /* Muted coffee brown */
    color: #FFF8E7; /* Creamy white for header text */
    padding: 1.5em 0;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

header h1 {
    margin: 0;
    font-size: 2.5em;
    font-weight: 300; /* Lighter font for a more 'fashion' feel */
}

.tab-nav {
    background-color: #D4B483; /* Lighter coffee brown for tabs */
    overflow: hidden;
    border-bottom: 2px solid #A07855; /* Separator line */
    text-align: center; /* Center the tab buttons */
}

.tab-nav button {
    background-color: inherit;
    float: none; /* Remove float for centering */
    display: inline-block; /* Allow centering */
    border: none;
    outline: none;
    cursor: pointer;
    padding: 14px 20px;
    transition: 0.3s;
    font-size: 1.1em;
    color: #4A3B31; /* Dark brown for tab text */
    border-bottom: 3px solid transparent; /* For active tab underline */
}

.tab-nav button:hover {
    background-color: #C19A6B; /* Slightly darker on hover */
    color: #FFF8E7;
}

.tab-nav button.active {
    background-color: #A07855; /* Active tab matches header */
    color: #FFF8E7;
    border-bottom: 3px solid #FFF8E7; /* White underline for active tab */
}

main {
    padding: 20px;
    max-width: 900px;
    margin: 20px auto; /* Center the main content */
    background-color: #FFF8E7; /* Creamy white for content background */
    box-shadow: 0 0 15px rgba(0,0,0,0.05);
    border-radius: 8px;
}

.tab-content {
    display: none;
    padding: 20px;
    border-top: none;
    animation: fadeIn 0.5s; /* Simple fade-in animation */
}

@keyframes fadeIn {
    from {opacity: 0;}
    to {opacity: 1;}
}

h2 {
    color: #A07855; /* Muted coffee brown for section titles */
    border-bottom: 2px solid #D4B483;
    padding-bottom: 10px;
    margin-top: 0;
    font-weight: 400;
}

p, li {
    font-size: 1em;
    margin-bottom: 1em;
}

ul {
    list-style-type: disc;
    padding-left: 20px;
}

.example {
    background-color: #EADDCA; /* Lighter beige for examples */
    padding: 15px;
    margin: 15px 0;
    border-left: 5px solid #A07855; /* Coffee brown accent */
    border-radius: 4px;
}

.example strong {
    color: #704214; /* Darker coffee for emphasis */
}

.quiz-container {
    margin-top: 30px;
    padding: 20px;
    background-color: #F0E6D1; /* Slightly different beige for quiz */
    border-radius: 6px;
}

.quiz-container h3 {
    color: #A07855;
    margin-top: 0;
}

.question {
    margin-bottom: 15px;
}

.question p {
    margin-bottom: 8px;
}

.options label {
    display: block;
    margin-bottom: 8px;
    cursor: pointer;
    background-color: #FFF8E7;
    padding: 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.options label:hover {
    background-color: #EADDCA;
}

.options input[type="radio"] {
    margin-right: 10px;
    accent-color: #A07855; /* Radio button color */
}

.feedback {
    margin-top: 10px;
    padding: 10px;
    border-radius: 4px;
    font-weight: bold;
}

.feedback.correct {
    background-color: #D7EADC; /* Muted green for correct */
    color: #3A6B4A;
    border-left: 4px solid #5CB85C;
}

.feedback.incorrect {
    background-color: #F8D7DA; /* Muted red for incorrect */
    color: #721C24;
    border-left: 4px solid #D9534F;
}

.show-answer-btn, .submit-quiz-btn {
    background-color: #A07855;
    color: #FFF8E7;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.3s;
    margin-top: 10px;
}

.show-answer-btn:hover, .submit-quiz-btn:hover {
    background-color: #8E6549; /* Darker coffee on hover */
}

.answer {
    background-color: #EADDCA;
    padding: 10px;
    margin-top: 10px;
    border-radius: 4px;
    border: 1px dashed #A07855;
    display: none; /* Initially hidden */
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #4A3B31; /* Dark brown for footer */
    color: #D4B483; /* Lighter coffee for footer text */
    font-size: 0.9em;
}