* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    --color-text-primary: #fff;
    --color-text-shadow: 0 0 4px #ffffffaa;
    --color-primary: #0375ff;
    --color-primary-hover: #0062d9;
}
body {
    background-color: black;
    background-image: url(../assets/img/textures/stars.jpeg);
    background-repeat: repeat;
    background-position: center;
    background-size: 500px;
    overflow-x: hidden;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 
        Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.top, .bottom {
    position: fixed;
    width: 100vw;
    padding: 1rem;
    left: 0;
    z-index: 2;
    display: flex;
    justify-content: space-between;
}
.top {
    top: 0;
    align-items: flex-start;
}
.bottom {
    bottom: 0;
    align-items: flex-end;
}
.controller {
    display: flex;
    gap: 0.5rem;
}
.controller button {
    background-color: var(--color-primary);
    border: none;
    outline: none;
    color: var(--color-text-primary);
    padding: 0.5rem;
    text-transform: capitalize;
    font-size: 0.75rem;
    font-weight: bold;
    border-radius: 0.25rem;
    cursor: pointer;
}
.controller button:hover {
    background-color: var(--color-primary-hover);
}
.settings {
    display: flex;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--color-text-primary);
    text-shadow: var(--color-text-shadow);
}
.settings input {
    width: 12rem;
}
.option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}
.option-label {
    width: 100%;
    font-weight: bold;
}
.stats {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--color-text-primary);
    text-shadow: var(--color-text-shadow);
    font-size: 0.75rem;
}
.stat {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.stat-number {
    font-weight: bold;
}
.scale {
    display: flex;
    align-items: center;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--color-text-primary);
    text-shadow: var(--color-text-shadow);
    font-size: 0.75rem;
}
.scale-lines {
    width: 200px;
    height: 8px;
    border-bottom: 1px dashed var(--color-text-primary);
    border-left: 1px dashed var(--color-text-primary);
    border-right: 1px dashed var(--color-text-primary);
}
.universe {
    position: relative;
}
.anchor {
    position: absolute;
    width: 100vw;
    height: 100vh;
}
.planet-wrapper {
    position: absolute;
    top: 0;
    left: 0;
}
.planet {
    position: relative;
}
.planet-atmosphere {
    position: relative;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,.3) 0%, rgba(255,255,255,0) 65%);
    border-radius: 50%;
    overflow: hidden;
}
.planet-surface{
    position: absolute; 
    height: 100%;
    width: 100%; 
    z-index: -1;
    background-size: cover;
}
.measurement-container {
    position: absolute;
    height: 100%;
    top: 0;
    right: calc(100% + 1rem);
    display: flex;
    justify-content: flex-end;
    align-items: center;
    min-width: 20rem;
    color: var(--color-text-primary);
    text-shadow: var(--color-text-shadow);
}
.measurement {
    min-width: max-content;
    margin-right: 0.5rem;
    font-size: 0.75rem;
}
.measurement-lines {
    height: calc(100% - 2px);
    width: 8px;
    border-top: 1px dashed var(--color-text-primary);
    border-bottom: 1px dashed var(--color-text-primary);
    border-left: 1px dashed var(--color-text-primary);
}
.label-container {
    position: absolute;
    height: 100%;
    top: 0;
    left: calc(100% + 1rem);
    display: flex;
    justify-content: flex-start;
    align-items: center;
    min-width: 20rem;
    color: var(--color-text-primary);
    text-shadow: var(--color-text-shadow);
}
.label {
    font-weight: bold;
    text-transform: capitalize;
}
@keyframes planetRotate {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: -200% center;
    }
}