body {
    background: #000;
    overflow: hidden;
    height: 100vh;
    width: 100vw;
}

.glass-nav {
    background: rgba(0, 0, 0, 0.4);
}

#solar-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
}

/* --- Planet Info Panel --- */
#planet-info-panel {
    position: fixed;
    top: 50%;
    left: 5%;
    transform: translateY(-50%);
    width: 310px;
    background: rgba(5, 5, 8, 0.85);
    backdrop-filter: blur(25px);
    border: 1px solid rgba(167, 139, 250, 0.2);
    border-radius: 20px;
    padding: 28px;
    color: white;
    z-index: 900;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease, transform 0.5s ease;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#planet-info-panel.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(-50%) translateX(10px);
}

.planet-ui-title {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.planet-ui-desc {
    font-size: 0.8rem;
    color: #999;
    line-height: 1.65;
}

.planet-ui-stat {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 7px;
    font-size: 0.78rem;
}

.planet-ui-stat span:first-child {
    color: #666;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.planet-ui-stat span:last-child {
    color: #ccc;
    font-weight: 500;
}

.planet-ui-close {
    margin-top: 5px;
    background: transparent;
    border: 1px solid rgba(167, 139, 250, 0.4);
    color: var(--accent);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.68rem;
}

.planet-ui-close:hover {
    background: var(--accent);
    color: white;
}

.planet-ui-compare-btn {
    margin-top: 10px;
    background: rgba(236, 72, 153, 0.1);
    border: 1px solid var(--accent-secondary);
    color: #fff;
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.68rem;
    font-weight: 600;
    width: 100%;
}

.planet-ui-compare-btn:hover {
    background: var(--accent-secondary);
    box-shadow: 0 0 15px rgba(236, 72, 153, 0.4);
}

/* --- Mode Controls --- */
#mode-controls {
    position: fixed;
    top: 100px;
    right: 40px;
    background: rgba(5, 5, 8, 0.7);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 8px;
    border-radius: 30px;
    display: flex;
    gap: 5px;
    z-index: 900;
}

.mode-btn {
    background: transparent;
    border: none;
    color: #888;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: 0.3s;
}

.mode-btn.active {
    background: var(--glass-border);
    color: white;
}

/* --- Compare Modal --- */
#compare-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: 90%;
    max-width: 800px;
    background: rgba(5, 5, 8, 0.95);
    backdrop-filter: blur(30px);
    border: 1px solid rgba(236, 72, 153, 0.3);
    border-radius: 24px;
    padding: 40px;
    color: white;
    z-index: 1100;
    opacity: 0;
    pointer-events: none;
    transition: 0.4s ease;
    box-shadow: 0 30px 100px rgba(0, 0, 0, 0.9);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: center;
}

#compare-modal.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.compare-side {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.compare-side.right { text-align: right; }
.compare-side.left .planet-ui-stat { padding-right: 20px; }
.compare-side.right .planet-ui-stat { padding-left: 20px; flex-direction: row-reverse; }

.compare-vs {
    font-family: 'Playfair Display', serif;
    font-size: 2.5rem;
    font-style: italic;
    color: var(--accent-secondary);
    text-shadow: 0 0 20px rgba(236, 72, 153, 0.4);
}

#compare-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1050;
    opacity: 0;
    pointer-events: none;
    transition: 0.4s;
}

#compare-overlay.visible { opacity: 1; pointer-events: auto; }

/* --- Time Controls --- */
#time-controls {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(5, 5, 8, 0.7);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 14px 24px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 15px;
    z-index: 900;
}

#time-controls label {
    color: #777;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 2px;
}

#time-slider { width: 140px; accent-color: var(--accent); cursor: pointer; }
#speed-label { color: var(--accent); font-size: 0.8rem; font-weight: 600; min-width: 50px; text-align: right; }

#wasd-hint {
    position: fixed;
    bottom: 30px;
    right: 40px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: rgba(0, 0, 0, 0.4);
    padding: 10px 20px;
    border-radius: 20px;
    border: 1px solid rgba(167, 139, 250, 0.2);
    z-index: 900;
    display: none;
}

/* --- Misc UI --- */
#planet-hover-label {
    position: fixed;
    pointer-events: none;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.72rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    background: rgba(0, 0, 0, 0.6);
    padding: 5px 14px;
    border-radius: 20px;
    border: 1px solid rgba(167, 139, 250, 0.3);
    z-index: 950;
    display: none;
    white-space: nowrap;
    backdrop-filter: blur(8px);
}

#hint-bar {
    position: fixed;
    bottom: 90px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.72rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    z-index: 900;
    pointer-events: none;
    animation: hintFade 8s ease forwards;
}

@keyframes hintFade { 0%, 60% { opacity: 1; } 100% { opacity: 0; } }

#page-title {
    position: fixed;
    top: 110px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 900;
    pointer-events: none;
    animation: titleFade 10s ease forwards;
}

#page-title h1 {
    font-family: 'Playfair Display', serif;
    font-style: italic;
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: white;
    text-shadow: 0 0 20px rgba(167, 139, 250, 0.3);
}

#page-title p {
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.72rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-top: 8px;
}

@keyframes titleFade { 0%, 50% { opacity: 1; } 100% { opacity: 0; } }

@media (max-width: 768px) {
    #planet-info-panel { width: 240px; padding: 20px; left: 3%; }
    #time-controls { bottom: 16px; padding: 10px 16px; }
    #time-slider { width: 100px; }
    #mode-controls { top: 80px; right: 16px; }
}

@media (max-width: 480px) {
    /* Info panel: full-width bar at bottom instead of side panel */
    #planet-info-panel {
        width: calc(100% - 24px);
        left: 12px;
        right: 12px;
        top: auto;
        bottom: 80px;
        transform: none;
        border-radius: 16px;
        max-height: 55vh;
        overflow-y: auto;
    }

    #planet-info-panel.visible {
        transform: none;
    }

    /* Compare modal: single column */
    #compare-modal {
        grid-template-columns: 1fr;
        padding: 24px 16px;
        width: 94%;
        gap: 16px;
        overflow-y: auto;
        max-height: 85vh;
    }

    .compare-side.right { text-align: left; }
    .compare-side.right .planet-ui-stat { flex-direction: row; padding-left: 0; }

    .compare-vs {
        font-size: 1.6rem;
        text-align: center;
    }

    /* Mode controls smaller on phone */
    #mode-controls {
        top: 70px;
        right: 10px;
        padding: 5px;
    }

    .mode-btn {
        padding: 6px 10px;
        font-size: 0.65rem;
    }

    /* Time slider narrower */
    #time-controls { padding: 8px 12px; gap: 8px; }
    #time-slider { width: 70px; }
    #time-controls label { font-size: 0.6rem; letter-spacing: 1px; }
}

/* --- Utility Classes --- */
.compare-desc-margin {
    margin-bottom: 15px;
}