/* =========================================
   NPTEL COURSE PAGE STYLES (Simplified)
   ========================================= */

/* --- Hero Section --- */
.hero-centered {
    background-color: var(--deep-blue);
    color: var(--white);
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 280px;
    padding-top: 100px;
    padding-bottom: 60px;
    text-align: center;
}

.hero-centered h1 {
    color: var(--white);
    font-family: var(--font-serif);
    margin-bottom: 10px;
    font-size: 2.5rem;
}

.hero-subtitle {
    font-family: var(--font-sans);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.85rem;
    color: #ffffff;
    margin-bottom: 15px;
    display: block;
    font-weight: 600;
}

.hero-bg-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(62, 92, 154, 0.15) 0%, rgba(42, 64, 104, 0) 70%);
    z-index: 1;
    pointer-events: none;
}

.hero-content-wrapper-center { z-index: 2; position: relative; }

/* --- Main Content --- */
.course-container {
    max-width: 1000px; /* Slightly narrower for readability */
    margin: -50px auto 80px; /* Overlap hero */
    position: relative;
    z-index: 10;
    display: flex;
    gap: 40px;
    padding: 0 20px;
}

/* --- Left Column (Details) --- */
.course-main {
    flex: 2;
    background: #fff;
    padding: 40px;
    border-radius: 12px; /* Softer corners */
    box-shadow: 0 10px 40px rgba(0,0,0,0.03); /* Lighter shadow */
}

.course-title {
    font-family: var(--font-serif);
    color: var(--deep-blue);
    font-size: 1.8rem;
    margin-bottom: 20px;
}

.course-desc {
    font-family: var(--font-sans);
    font-size: 1rem;
    color: #555;
    line-height: 1.8;
    margin-bottom: 30px;
}

.course-desc p {
    margin-bottom: 15px;
}

/* Instructors Section */
.instructor-list {
    margin-top: 30px;
    padding-top: 25px;
    border-top: 1px solid #f0f0f0;
}

.instructor-list h4 {
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.instructor-names {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.6;
}

/* --- Right Column (Meta Card) --- */
.course-sidebar {
    flex: 1;
    min-width: 300px;
}

.meta-card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.03);
    padding: 30px;
    border: 1px solid #f0f0f0;
    position: sticky;
    top: 100px;
}

.meta-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
    border-bottom: 1px dashed #eee;
    padding-bottom: 12px;
    font-size: 0.9rem;
}

.meta-item:last-child { border-bottom: none; margin-bottom: 25px; }

.meta-label {
    font-weight: 600;
    color: #888;
}

.meta-value {
    font-weight: 700;
    color: var(--deep-blue);
    text-align: right;
}

/* Enroll Button */
.btn-enroll {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    background-color: var(--primary-blue);
    color: #fff;
    padding: 14px;
    border-radius: 50px; /* Pill shape */
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-decoration: none;
    transition: all 0.3s;
    font-size: 0.85rem;
    box-shadow: 0 4px 15px rgba(62, 92, 154, 0.2);
}

.btn-enroll:hover {
    background-color: var(--deep-blue);
    color: #fff;
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(62, 92, 154, 0.3);
}

/* --- Responsive --- */
@media (max-width: 992px) {
    .course-container {
        flex-direction: column;
        margin-top: 20px;
        box-shadow: none; /* Flat look on mobile */
    }
    
    .course-main, .meta-card {
        padding: 25px;
        box-shadow: none;
        border: 1px solid #eee;
    }
    
    .hero-centered {
        padding-top: 100px;
        min-height: 220px;
    }
    
    .hero-centered h1 {
        font-size: 2rem;
    }
}