* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    overflow: hidden;
    background: #000;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #fff;
}

canvas {
    display: block;
}

#ui-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

#ui-overlay > * {
    pointer-events: auto;
}

#title-bar {
    position: absolute;
    top: 12px;
    left: 16px;
}

#title-bar h1 {
    font-size: 1.1rem;
    font-weight: 300;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-shadow: 0 0 10px rgba(100,180,255,0.5);
}

#credit {
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.65rem;
    color: rgba(255,255,255,0.4);
    letter-spacing: 0.5px;
}

#controls {
    position: absolute;
    top: 12px;
    right: 16px;
    display: flex;
    gap: 8px;
}

#controls button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(10,20,40,0.7);
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: background 0.2s, border-color 0.2s;
}

#controls button:hover {
    background: rgba(30,60,120,0.8);
    border-color: rgba(100,180,255,0.6);
}

#toggle-panel {
    position: absolute;
    top: 50px;
    right: 16px;
    background: rgba(5,15,35,0.8);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
    padding: 12px 14px;
    backdrop-filter: blur(6px);
}

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 4px 0;
}

.toggle-row label {
    font-size: 0.75rem;
    color: #bbb;
    white-space: nowrap;
}

.toggle-row input[type="checkbox"] {
    accent-color: #4ab4ff;
    width: 16px;
    height: 16px;
    cursor: pointer;
}

#speed-control {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(10,20,40,0.7);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 20px;
    padding: 8px 16px;
    backdrop-filter: blur(4px);
    font-size: 0.8rem;
}

#btn-play-pause {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.25);
    background: rgba(20,40,80,0.6);
    color: #fff;
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, border-color 0.2s;
}

#btn-play-pause:hover {
    background: rgba(30,60,120,0.8);
    border-color: rgba(100,180,255,0.6);
}

#speed-slider {
    width: 100px;
    accent-color: #4ab4ff;
}

#speed-value {
    min-width: 32px;
    text-align: center;
}

#planet-nav {
    position: absolute;
    bottom: 64px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: center;
    max-width: 90vw;
}

#planet-nav button {
    padding: 5px 12px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(10,20,40,0.7);
    color: #ccc;
    font-size: 0.75rem;
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: all 0.2s;
    letter-spacing: 0.5px;
}

#planet-nav button:hover,
#planet-nav button.active {
    background: rgba(30,60,120,0.8);
    border-color: rgba(100,180,255,0.6);
    color: #fff;
}

#info-panel {
    position: absolute;
    top: 60px;
    left: 16px;
    width: 300px;
    max-height: calc(100vh - 160px);
    overflow-y: auto;
    background: rgba(5,15,35,0.9);
    border: 1px solid rgba(100,180,255,0.2);
    border-radius: 12px;
    padding: 20px;
    backdrop-filter: blur(10px);
    transition: opacity 0.3s, transform 0.3s;
}

#info-panel.hidden {
    opacity: 0;
    transform: translateX(-20px);
    pointer-events: none;
}

#close-info {
    position: absolute;
    top: 10px;
    right: 12px;
    background: none;
    border: none;
    color: #aaa;
    font-size: 1.4rem;
    cursor: pointer;
}

#close-info:hover {
    color: #fff;
}

#info-name {
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: 12px;
    color: #4ab4ff;
}

#info-body {
    font-size: 0.82rem;
    line-height: 1.6;
    color: #ccc;
}

#info-body .stat {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

#info-body .stat-label {
    color: #888;
}

#info-body .description {
    margin-top: 12px;
    font-style: italic;
    color: #aaa;
}

/* Mobile adjustments */
@media (max-width: 600px) {
    #title-bar h1 {
        font-size: 0.85rem;
    }

    #toggle-panel {
        top: 46px;
        right: 10px;
        padding: 8px 10px;
    }

    .toggle-row label {
        font-size: 0.68rem;
    }

    #info-panel {
        top: auto;
        bottom: 110px;
        left: 10px;
        right: 10px;
        width: auto;
        max-height: 35vh;
    }

    #planet-nav {
        bottom: 58px;
        gap: 4px;
    }

    #planet-nav button {
        padding: 4px 8px;
        font-size: 0.65rem;
    }

    #speed-control {
        bottom: 12px;
        padding: 6px 12px;
    }

    #speed-slider {
        width: 70px;
    }

    #controls button {
        width: 30px;
        height: 30px;
        font-size: 1rem;
    }
}

/* Scrollbar */
#info-panel::-webkit-scrollbar {
    width: 4px;
}

#info-panel::-webkit-scrollbar-thumb {
    background: rgba(100,180,255,0.3);
    border-radius: 2px;
}

.planet-label {
    position: absolute;
    color: rgba(255,255,255,0.85);
    font-size: 11px;
    pointer-events: none;
    text-shadow: 0 0 4px rgba(0,0,0,0.9);
    white-space: nowrap;
    transform: translate(-50%, -100%);
}