/* General Styles */
body {
    font-family: 'Yu Gothic', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 20px 0;
}

/* Header */
header {
    background: #333;
    color: #fff;
    padding: 2rem 0;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2.5rem;
}

header p {
    font-size: 1.2rem;
}

.cta-button {
    display: inline-block;
    background: #007bff;
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 20px;
    font-size: 1.1rem;
}

/* Navigation Bar */
nav {
    background: #444;
    color: #fff;
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav ul {
    padding: 0;
    list-style: none;
    text-align: center;
    margin: 0;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav a {
    color: #fff;
    text-decoration: none;
    font-size: 1.1rem;
}

/* Sections */
section {
    padding: 40px 0;
    border-bottom: 1px solid #ddd;
}

section h2 {
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
}

/* Instructor Section */
.instructor-profile {
    display: flex;
    align-items: center;
    gap: 30px;
}

.balloon {
    position: relative;
    background: #e0e0e0;
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
}

.balloon:after {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 0;
    height: 0;
    border: 20px solid transparent;
    border-bottom-color: #e0e0e0;
    border-top: 0;
    margin-left: -20px;
    margin-top: -20px;
}

/* Course Overview */
#course-overview .feature, #course-overview .goal {
    margin-bottom: 20px;
}

/* Curriculum */
#curriculum ol {
    list-style: none;
    padding: 0;
}

#curriculum li {
    background: #fff;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
}

/* FAQ */
.faq-item {
    margin-bottom: 15px;
}

.faq-item h4 {
    margin: 0;
    font-size: 1.2rem;
}

/* Footer */
footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .container {
        width: 90%;
    }

    header h1 {
        font-size: 2rem;
    }

    section h2 {
        font-size: 1.8rem;
    }

    .instructor-profile {
        flex-direction: column;
        text-align: center;
    }
}