body {
    margin: 0;
    font-family: Verdana, sans-serif;
    background: url('1920x1080_moon-cup_Merry-Mountain-1.avif') no-repeat center center fixed;
    background-size: cover;
}

/* Main window */
.window {
    width: 85%;
    margin: 40px auto;
    background: rgba(10, 60, 30, 0.95); /* pine green */
    border-radius: 16px;
    box-shadow: 0 0 30px rgba(200, 16, 46, 0.7);
    border: 4px solid #c8102e; /* Mario red */
}

/* Header */
.window-header {
    background: linear-gradient(to right, #c8102e, #8b0000);
    padding: 14px;
    font-weight: bold;
    color: white;
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
    letter-spacing: 1px;
    text-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
}

/* Layout */
.window-content {
    display: flex;
}

/* Sidebar */
.tabs {
    width: 200px;
    background: #0f5e2b; /* Christmas green */
    padding: 20px 10px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    border-right: 4px solid #c8102e;
}

/* Tab buttons */
.tab-btn {
    padding: 14px;
    border: none;
    background: #c8102e; /* Mario red */
    color: white;
    cursor: pointer;
    border-radius: 10px;
    font-weight: bold;
    width: 100%;
    text-align: left;
    transition: all 0.3s ease;
}

/* Hover effect (coin power-up vibe) */
.tab-btn:hover {
    background: #ffd700; /* gold coin */
    color: black;
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.9);
    transform: scale(1.05);
}

/* Content area */
.content {
    flex: 1;
    padding: 30px;
    text-align: center;
    color: white;
}

/* Welcome heading */
.welcome {
    color: #ffd700; /* gold */
    text-shadow: 0 0 12px rgba(255, 215, 0, 0.9);
    font-size: 2.2em;
}

/* Image container */
.image-container {
    display: flex;
    justify-content: center;
    margin: 25px 0;
}

.image-container img {
    width: 420px;
    height: auto;
    border-radius: 18px;
    border: 4px solid #ffd700;
    box-shadow: 0 0 25px rgba(255, 215, 0, 0.8);
}

/* Sections */
.section {
    display: none;
}

.section.active {
    display: block;
}
.course-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background: rgba(60, 10, 20, 0.95);
    border-radius: 12px;
    overflow: hidden;
    font-size: 14px;
}

.course-table th {
    background: #8b000f;
    color: white;
    padding: 14px;
    text-align: center;
}

.course-table td {
    padding: 12px;
    border-bottom: 1px solid #7a0f1a;
    text-align: center;
}

.course-table tr:hover {
    background: rgba(255, 0, 60, 0.15);
}

.course-table td:nth-child(3) {
    text-align: left;
}