@import url('https://fonts.googleapis.com/css2?family=Exo+2:wght@300;400;700&display=swap');

:root {
    --primary-font: 'Exo 2', sans-serif;
    --text-color: #f0f0f0;
    --highlight-color: #fca311;
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    background-color: #000;
    color: var(--text-color);
    font-family: var(--primary-font);
    overflow-x: hidden;
}

#bg {
    position: fixed;
    top: 0;
    left: 0;
    outline: none;
    z-index: -1;
}

#content {
    position: absolute;
    width: 100%;
    z-index: 1;
}

section {
    min-height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    box-sizing: border-box;
    text-align: center;
}

section h1 {
    font-size: 3rem;
    font-weight: 300;
    max-width: 800px;
}

section h2 {
    font-size: 2.5rem;
    color: var(--highlight-color);
}

/* Loading screen */
#loading-screen {
    position: fixed;
    width: 100%;
    height: 100%;
    background: #000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 100;
    transition: opacity 1s ease-out;
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--highlight-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 2s linear infinite;
}

#loading-screen p {
    margin-top: 20px;
    letter-spacing: 3px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* UI overlay */
.ui-bar {
    position: fixed;
    top: 10px;
    left: 10px;
    right: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    pointer-events: none;
}
.ui-bar .btn {
    pointer-events: auto;
    background: rgba(0,0,0,0.45);
    border: 1px solid #444;
    color: #ddd;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 12px;
    letter-spacing: 1px;
    cursor: pointer;
}
.ui-bar .btn:hover {
    border-color: var(--highlight-color);
    color: #fff;
}

/* Planet navigation */
.planet-navigation {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}
.planet-nav-item {
    border: 1px solid #333;
    padding: 10px 16px;
    border-radius: 20px;
    background: rgba(255,255,255,0.06);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}
.planet-nav-item.hover, .planet-nav-item:hover {
    transform: translateY(-2px);
    border-color: var(--highlight-color);
    box-shadow: 0 0 10px rgba(252,163,17,0.4);
}