/* Import Google Font for modern look */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;700&display=swap');

:root {
    --color-background: #0a0a1a;
    --color-text-light: #e0e0f0;
    --color-accent: #4a90e2; /* Blue for highlights/links */
    --color-sidebar: #1c1c36;
    --color-border: #3a3a5a;
    --font-primary: 'Roboto', sans-serif;
}

/* Background image using the generated asset */
body {
    font-family: var(--font-primary);
    margin: 0;
    padding: 0;
    background-color: var(--color-background);
    color: var(--color-text-light);
    line-height: 1.6;
    min-height: 100vh;
    background-image: url('starfield_background.png');
    background-size: cover;
    background-attachment: fixed;
}

/* Header Styling */
.header {
    background-color: rgba(0, 0, 0, 0.5);
    padding: 30px 20px;
    text-align: center;
    border-bottom: 2px solid var(--color-accent);
}

.header h1 {
    font-size: 2.5em;
    color: white;
    margin-bottom: 5px;
}

/* ...existing styles... */
.container {
    display: flex;
    max-width: 1400px;
    margin: 20px auto;
    padding: 0 15px;
}

/* Sidebar Navigation */
.sidebar {
    width: 280px;
    background-color: var(--color-sidebar);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    flex-shrink: 0;
    height: fit-content;
    position: sticky;
    top: 20px;
    margin-right: 20px;
}

/* ...existing styles... */
.sidebar ul li a {
    display: block;
    padding: 10px 15px;
    margin-bottom: 5px;
    text-decoration: none;
    color: var(--color-text-light);
    border-radius: 4px;
    transition: background-color 0.2s, color 0.2s;
}

.sidebar ul li a:hover,
.sidebar ul li a.active {
    background-color: var(--color-accent);
    color: var(--color-background);
    font-weight: bold;
}

/* Main Content Area */
.content-area {
    flex-grow: 1;
}

.content-area article {
    background-color: rgba(28, 28, 54, 0.7); /* Slightly darker, transparent background for content */
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
}

.content-area h2 {
    color: var(--color-accent);
    font-size: 2em;
    border-bottom: 2px solid var(--color-border);
    padding-bottom: 10px;
    margin-top: 0;
}

/* ...existing styles... */
.overview-image {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
    border-radius: 6px;
}

/* Planet Detail Styling */
.planet-detail h3 {
    color: var(--color-text-light);
    margin-top: 20px;
    border-left: 4px solid var(--color-accent);
    padding-left: 10px;
}

.planet-facts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.fact-item {
    background-color: var(--color-sidebar);
    padding: 15px;
    border-radius: 6px;
    border-left: 3px solid var(--color-accent);
}

.fact-item strong {
    display: block;
    font-size: 0.9em;
    color: var(--color-accent);
    margin-bottom: 5px;
}

.fact-item span {
    font-size: 1.1em;
    font-weight: 700;
}

/* Footer */
.footer {
    text-align: center;
    padding: 15px;
    margin-top: 30px;
    background-color: rgba(0, 0, 0, 0.5);
    border-top: 1px solid var(--color-border);
    color: #aaaaaa;
}

/* Responsiveness (Mobile adjustments) */
@media (max-width: 900px) {
    .container {
        flex-direction: column;
        padding: 0;
    }

    .sidebar {
        width: 100%;
        margin: 0;
        border-radius: 0;
        position: static; /* Remove sticky for mobile */
        margin-bottom: 20px;
    }

    .sidebar h2 {
        text-align: center;
    }

    /* Make navigation scrollable horizontally if necessary, or stack vertically */
    .sidebar ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
    }

    .sidebar ul li a {
        padding: 8px 12px;
        margin: 4px;
        text-align: center;
    }

    .content-area {
        padding: 0 15px;
    }

    .content-area article {
        padding: 20px;
    }
}