/* --- General Styling & Variables --- */
:root {
    --primary-font: 'Source Sans 3', sans-serif;
    --heading-font: 'Playfair Display', serif;
    --black: #000000;
    --dark-grey: #333333;
    --medium-grey: #777777;
    --light-grey: #cccccc;
    --white: #ffffff;
    --card-bg: #f2f2f2;
    --bg-color: var(--white);
    --accent-color: var(--black); /* Using black as accent for contrast */
}


body {
    font-family: var(--primary-font);
    background-color: var(--bg-color);
    color: var(--dark-grey);
    line-height: 1.6;
    margin: 0;
    padding: 40px;
    font-size: 16px;
}


.container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-areas:
        "header sidebar"
        "main sidebar";
    gap: 40px;
}


h1, h2 {
    font-family: var(--heading-font);
    color: var(--black);
    margin-top: 0;
}


/* --- Header Section --- */
header {
    grid-area: header;
    border-bottom: 1px solid var(--light-grey);
    padding-bottom: 20px;
}


header h1 {
    font-size: 4rem;
    margin-bottom: 10px;
    line-height: 1.1;
}


header .instructor-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--medium-grey);
    letter-spacing: 1.5px;
}


/* --- Main Content Sections --- */
main {
    grid-area: main;
}


.about-course {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    align-items: center;
}


.about-course h2 {
    color: var(--accent-color);
    font-family: var(--primary-font);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 15px;
}


.about-text {
    flex-basis: 70%;
}


.course-highlight {
    flex-basis: 30%;
    text-align: center;
    font-weight: 600;
    color: var(--black);
    border: 1px solid var(--light-grey);
    padding: 20px;
    border-radius: 8px;
}


.course-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}


.course-content h2, .eligibility h2 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}


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


ul li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
    color: var(--medium-grey);
}


ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-size: 18px;
}


/* --- Sidebar --- */
.sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    gap: 30px;
}


.instructor-card, .schedule-card {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    color: var(--dark-grey);
}


.instructor-card h2 {
    text-align: center;
    margin-bottom: 20px;
}


.instructor-image {
    display: block;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 20px;
    border: 2px solid var(--light-grey);
}


.schedule-card p {
    margin: 0 0 12px 0;
    color: var(--dark-grey);
}


.schedule-card strong {
    font-weight: 600;
    color: var(--black);
}


/* --- Call-to-Action Button --- */
.register-button {
    display: block;
    background-color: var(--black);
    color: var(--white);
    text-align: center;
    padding: 15px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    transition: background-color 0.3s ease, transform 0.3s ease, color 0.3s ease;
}


.register-button:hover {
    background-color: var(--dark-grey);
    transform: translateY(-3px);
    color: var(--white);
}


/* Footer  */
.visually-hidden {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
  }
/* --- Responsive Design --- */
@media (max-width: 900px) {
    .container {
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "sidebar"
            "main";
    }


    header h1 {
        font-size: 3rem;
    }


    .about-course {
        flex-direction: column;
        align-items: flex-start;
    }
}


@media (max-width: 600px) {
    body {
        padding: 20px;
    }


    .course-details {
        grid-template-columns: 1fr;
    }
}