/* Imports the 'Poppins' font in multiple weights from Google Fonts for use throughout the page. */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');

/* Universal reset to remove default margins and padding; sets 'box-sizing' to ensure elements are sized by border-box, and sets the default font for all elements. 'scroll-behavior: smooth' enables smooth scrolling for anchor links. */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    scroll-behavior: smooth;
}

/* Sets a minimum height for the body to ensure it fills the viewport and applies a background gradient. 'overflow-x: hidden' prevents horizontal scroll. */
body {
    min-height: 100vh;
    background: linear-gradient(#000000, #190531);
    overflow-x: hidden;
}

/* Styles the header with absolute positioning and high z-index to ensure it's always on top, with padding and flexbox for layout. */
header {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 30px 100px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000; 
}

/* Logo styling with uppercase text, letter spacing, and white color to stand out against the dark background. */
header .logo {
    color: #fff;
    font-weight: 700;
    text-decoration: none;
    font-size: 2em;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Flexbox layout for the header navigation list for even spacing and centering of items. */
header ul {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Removes list styling and adds margin to each list item for spacing. */
header ul li {
    list-style: none;
    margin-left: 20px;
}

/* Styles for the navigation links with padding for clickable area and rounded borders for aesthetics. */
header ul li a {
    text-decoration: none;
    padding: 6px 15px;
    color: #fff;
    border-radius: 20px;
}

/* Hover and active styles for navigation links to indicate interactivity and the current section. */
header ul li a:hover,
header ul li a.active {
    background: #fff;
    color: #A766D0;
}

/* Section base styling sets up the section's size and uses flexbox for centering its content. 'overflow: hidden' enables the clipping of child elements for the parallax effect. */
section {
    position: relative;
    width: 100%;
    height: 100vh;
    padding: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

/* This pseudo-element styles a gradient at the bottom of sections for a fade-out effect, enhancing the parallax experience. */
section::before {
    content: '';
    position: absolute;
    bottom: -150px;
    width: 100%;
    height: 300px;
    background: linear-gradient(to top, #190531, transparent);
}

/* Absolute positioning for images in sections allows them to be placed independently of the text, essential for parallax. */
section img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
}

/* The 'moon' image uses 'mix-blend-mode: screen' to blend with the dark background. 'object-fit: contain' keeps its aspect ratio. */
section img#moon {
    mix-blend-mode: screen;
    object-fit: contain;
}

/* Foreground 'rockfront' image is given a higher z-index to ensure it's on top of other elements. */
section img#rockfront {
    z-index: 10;
}

/* Styles for the main heading text with absolute positioning and a large font size. It starts off-screen to the right. */
#text {
    position: absolute;
    right: -350px;
    color: #fff;
    white-space: nowrap;
    font-size: 7.5vw;
    z-index: 9;
}

/* Button styling with inline-block for layout, padding for size, rounded borders, and initial transformation for an off-screen start position. */
#btn {
    text-decoration: none;
    display: inline-block;
    padding: 8px 30px;
    border-radius: 40px;
    background: #fff;
    color: #2b1055;
    font-size: 1.5em;
    z-index: 9;
    transform: translateY(100px);
}

/* Additional section styling for non-parallax sections with padding, background gradient, and centered text. */
.sec {
    position: relative;
    padding: 50px 100px;
    background:linear-gradient(to bottom, transparent, #564094);
    text-align: center;
    margin: 100px auto;
    max-width: 800px;
    overflow: hidden;
}

/* Heading and paragraph styles within '.sec' sections for size, color, and margin for visual separation. */
.sec h2 {
    font-size: 3.5em;
    margin-bottom: 20px;
    color: #fff;
}

.sec p {
    font-size: 1.2em;
    margin-bottom: 20px;
    color: #fff;
}

/* Link styling within '.sec' to ensure visibility and a hover effect for better user experience. */
.sec a {
    color: #fff;
}

.sec a:hover {
    text-decoration: none;
}

/* Button styling within '.sec' with padding, background color, border-radius for rounded corners, and a hover effect. */
.sec button {
    padding: 10px 20px;
    background-color: #A765D0;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.sec button a {
    text-decoration: none;
}

.sec button:hover {
    background-color: #000;
}

/* Footer styling with background color, padding, and text styling for consistency with the page's color scheme. */
footer {
    background-color: #2b1055;
    padding: 10px 0;
    text-align: center;
    color: #fff;
    font-size: 1em;
}

/* Link styling in the footer with a color transition effect on hover. */
footer a {
    color: #A766D0;
    text-decoration: none;
    transition: 0.3s;
}

footer a:hover {
    text-decoration: underline;
    color: #fff;
}