html,
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    min-height: 100vh;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: radial-gradient(ellipse at 60% 40%, #212447 60%, #15161e 100%);
    color: #eaeaea;
    position: relative;
}

#container {
    width: 100vw;
    height: 100vh;
    position: relative;
    z-index: 1;
}

#controls-panel {
    position: absolute;
    top: 22px;
    left: 22px;
    background: rgba(25, 26, 45, 0.68);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.18);
    border-radius: 18px;
    padding: 25px 24px 18px 24px;
    z-index: 10;
    max-width: 300px;
    backdrop-filter: blur(9px);
    border: 1.5px solid rgba(255, 255, 255, 0.12);
    transition: background 0.3s, border 0.3s;
}

#controls-panel h2 {
    margin: 0 0 18px 0;
    font-size: 1.3em;
    color: #ffe57b;
    text-align: center;
    letter-spacing: 0.06em;
    font-weight: 600;
    text-shadow: 0 2px 8px #0008;
}

.planet-control {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 12px 0;
}

.planet-label {
    flex: 1;
    font-size: 1.08em;
    color: #fff;
    min-width: 80px;
    letter-spacing: 0.04em;
    font-weight: 500;
}

.slider {
    flex: 2;
    width: 120px;
    accent-color: #ffd700;
    background: linear-gradient(90deg, #ffd700 30%, #5e86ff 100%);
    border-radius: 6px;
    height: 5px;
    outline: none;
    transition: box-shadow 0.2s;
}

.slider:hover {
    box-shadow: 0 0 0 2px #ffe57b55;
}

.slider-value {
    min-width: 2.4em;
    display: inline-block;
    text-align: right;
    color: #ffd700;
    font-size: 1em;
    margin-left: 6px;
    font-family: 'Fira Mono', 'Consolas', monospace;
}

#pause-btn,
#reset-camera-btn,
.theme-toggle-btn {
    width: 100%;
    margin-top: 16px;
    padding: 10px 0;
    border: none;
    border-radius: 10px;
    font-size: 1.07em;
    font-weight: 500;
    background: linear-gradient(90deg, #232344 70%, #5e86ff 100%);
    color: #ffe57b;
    cursor: pointer;
    box-shadow: 0 2px 10px #0004;
    letter-spacing: 0.03em;
    transition: background 0.2s, color 0.2s;
}

#pause-btn:hover,
#reset-camera-btn:hover,
.theme-toggle-btn:hover {
    background: linear-gradient(90deg, #4749af 0%, #ffd700 100%);
    color: #232344;
}

#reset-camera-btn {
    display: none;
}

.theme-toggle-btn {
    margin-top: 10px;
}

@media (max-width: 600px) {
    #controls-panel {
        top: 8px;
        left: 50%;
        transform: translateX(-50%);
        max-width: 97vw;
        padding: 16px 7vw 12px 7vw;
    }

    .planet-label {
        min-width: 60px;
    }
}

.planet-tooltip {
    background: rgba(44, 45, 67, 0.96);
    color: #ffd700;
    border: 1px solid #ffd70035;
    border-radius: 10px;
    padding: 7px 18px;
    font-size: 1.08em;
    font-weight: 500;
    box-shadow: 0 6px 32px #0009;
    pointer-events: none;
    z-index: 1003;
    opacity: 0;
    transition: opacity 0.22s, background 0.18s, color 0.18s;
}

.planet-tooltip.show {
    opacity: 1;
}

.planet-tooltip.lightmode {
    background: rgba(250, 250, 255, 0.98);
    color: #3a4a99;
    border: 1px solid #a6b9ff55;
}

body.lightmode {
    background: radial-gradient(ellipse at 60% 40%, #f0f0ff 60%, #e4eaff 100%);
    color: #232344;
}

body.lightmode #controls-panel {
    background: rgba(255, 255, 255, 0.79);
    border-color: rgba(80, 100, 180, 0.09);
}

body.lightmode .slider-value {
    color: #3a4a99;
}

body.lightmode .planet-label {
    color: #3a4a99;
}

body.lightmode #pause-btn,
body.lightmode #reset-camera-btn,
body.lightmode .theme-toggle-btn {
    background: linear-gradient(90deg, #f4f4fd 65%, #b0d4ff 100%);
    color: #3a4a99;
}

body.lightmode #pause-btn:hover,
body.lightmode #reset-camera-btn:hover,
body.lightmode .theme-toggle-btn:hover {
    background: linear-gradient(90deg, #ffd700 0%, #b0d4ff 100%);
    color: #232344;
}

/* Responsive enhancements for mobile devices (add this to your <style> section or as a separate CSS file) */

@media (max-width: 900px) {
    #controls-panel {
        top: 10px;
        left: 50%;
        transform: translateX(-50%);
        max-width: 98vw;
        padding: 16px 3vw 12px 3vw;
        border-radius: 15px;
    }

    .planet-label {
        min-width: 50px;
        font-size: 1em;
        word-break: break-word;
    }
}

@media (max-width: 600px) {
    #controls-panel {
        top: 0;
        left: 0;
        right: 0;
        transform: none;
        width: 100vw;
        max-width: 100vw;
        min-width: 0;
        border-radius: 0 0 18px 18px;
        padding: 14px 4vw 8px 4vw;
        box-sizing: border-box;
        font-size: 1em;
    }

    #controls-panel h2 {
        font-size: 1.08em;
    }

    .planet-control {
        gap: 7px;
        margin: 7px 0;
    }

    .planet-label {
        min-width: 40px;
        font-size: 0.96em;
    }

    .slider {
        width: 90px;
        min-width: 60px;
        max-width: 120px;
        height: 4px;
    }

    #pause-btn,
    #reset-camera-btn,
    .theme-toggle-btn {
        padding: 8px 0;
        font-size: 0.98em;
        margin-top: 10px;
        border-radius: 8px;
    }

    .planet-tooltip {
        font-size: 0.92em;
        padding: 6px 12px;
        border-radius: 8px;
    }
}

@media (max-width: 430px) {
    #controls-panel {
        padding: 11px 2vw 6px 2vw;
        border-radius: 0 0 12px 12px;
    }

    .planet-label {
        min-width: 28px;
        font-size: 0.88em;
    }

    .slider {
        width: 65px;
        min-width: 40px;
        max-width: 90px;
        height: 3px;
    }

    .planet-tooltip {
        font-size: 0.83em;
        padding: 5px 8px;
        border-radius: 6px;
    }

}

#controls-panel.collapsed {
    width: 44px !important;
    min-width: 0 !important;
    max-width: 44px !important;
    padding: 8px 4px 8px 4px !important;
    overflow: hidden;
    transition: max-width 0.3s, width 0.3s, padding 0.3s;
}

#controls-panel.collapsed>*:not(#toggle-panel-btn) {
    display: none !important;
}

.planet-tooltip {
    background: rgba(44, 45, 67, 0.87);
    color: #ffd700;
    border: none;
    border-radius: 8px;
    padding: 2px 10px;
    font-size: 0.95em;
    font-weight: 500;
    box-shadow: 0 2px 8px #0005;
    pointer-events: none;
    z-index: 2000;
    opacity: 1;
    transition: opacity 0.18s;
}

#toggle-panel-btn {
    background: transparent;
    border: none;
    color: #ffe57b;
    font-size: 1.7em;
    cursor: pointer;
    padding: 0;
    margin: 0;
}

@media (max-width: 600px) {
    #controls-panel {
        width: 95vw;
        max-width: 95vw;
        left: 2.5vw;
        right: 2.5vw;
        border-radius: 0 0 16px 16px;
    }

    #controls-panel.collapsed {
        width: 36px !important;
        max-width: 36px !important;
        left: 8px !important;
        right: auto !important;
        border-radius: 10px !important;
    }
}

/* Make sure the #container always fills the viewport */
html,
body,
#container {
    width: 100vw;
    height: 100vh;
}

body {
    /* Prevent unwanted scrolling on mobile */
    overscroll-behavior: none;
    touch-action: none;
}