/* Global Styles
   Sets up the full-screen immersive black background for space visualization.
*/
body {
    margin: 0;
    overflow: hidden;
    background-color: #000;
    font-family: "Inter", sans-serif;
    color: white;
}

/* Canvas Container
   Holds the WebGL output. Cursor is set to crosshair to indicate the lens position is interactive.
*/
#canvas-container {
    width: 100vw;
    height: 100vh;
    display: block;
    cursor: crosshair;
}

/* UI Overlay
   Floating control panel on the left side.
   Uses backdrop-filter to blur the space background behind the controls.
*/
#ui-layer {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(8, 15, 25, 0.9);
    padding: 16px;
    border-radius: 10px;
    border: 1px solid rgba(100, 200, 255, 0.15);
    backdrop-filter: blur(8px);
    width: 260px;
    pointer-events: auto;
    user-select: text;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
    transition:
        height 0.3s ease,
        padding 0.3s ease;
    overflow: hidden;
    max-height: 90vh;
    overflow-y: auto;
}

/* Custom scrollbar styling for the UI panel */
#ui-layer::-webkit-scrollbar {
    width: 4px;
}
#ui-layer::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}
#ui-layer::-webkit-scrollbar-thumb {
    background: #4facfe;
    border-radius: 2px;
}

/* Minimized state for the UI panel */
#ui-layer.minimized {
    height: 28px;
    padding-bottom: 0;
    overflow: hidden;
}
#ui-layer.minimized .control-content {
    opacity: 0;
    pointer-events: none;
}

.ui-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

h1 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    color: #b3e5ff;
    letter-spacing: 0.3px;
}

#toggle-btn {
    background: transparent;
    border: none;
    color: #4facfe;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    padding: 0 4px;
    transition: transform 0.3s;
}
#toggle-btn:hover {
    color: white;
}

.control-content {
    transition: opacity 0.2s ease;
    opacity: 1;
}

p {
    font-size: 0.75rem;
    color: #8fb8e0;
    margin-bottom: 8px;
    line-height: 1.3;
}

.credit-text {
    font-size: 0.7rem;
    color: #8fb8e0;
    margin-bottom: 12px;
    font-style: italic;
    opacity: 0.9;
}

/* Control Groups for Sliders and Buttons */
.control-group {
    margin-bottom: 12px;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    margin-bottom: 4px;
    color: #ccc;
    font-weight: 500;
}

/* Custom Range Slider Styling */
input[type="range"] {
    width: 100%;
    cursor: pointer;
    height: 4px;
    background: #334;
    border-radius: 2px;
    appearance: none;
}
input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 14px;
    height: 14px;
    background: #4facfe;
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.grid-options,
.model-options {
    display: flex;
    gap: 4px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}
.preset-btn,
.model-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #8fb8e0;
    padding: 6px 0;
    font-size: 0.7rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    min-width: 60px;
}
.preset-btn:hover,
.model-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: white;
}
.preset-btn.active,
.model-btn.active {
    background: rgba(79, 172, 254, 0.3);
    border-color: #4facfe;
    color: white;
    font-weight: bold;
}

input[type="file"] {
    display: none;
}
.file-upload-btn {
    display: block;
    background: rgba(79, 172, 254, 0.15);
    border: 1px dashed rgba(79, 172, 254, 0.5);
    color: #4facfe;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    text-align: center;
    width: 100%;
    box-sizing: border-box;
    transition:
        background 0.2s,
        color 0.2s;
    margin-top: 8px;
}
.file-upload-btn:hover {
    background: rgba(79, 172, 254, 0.3);
    color: white;
}

.layer-list {
    margin-top: 4px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.layer-item {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    padding: 4px 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.layer-name {
    font-size: 0.7rem;
    color: #7affb5;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 170px;
}

.remove-layer-btn {
    background: none;
    border: none;
    color: #ff5555;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0 0 0 8px;
    line-height: 1;
    transition: color 0.2s;
}
.remove-layer-btn:hover {
    color: #ffaaaa;
}

.reset-container {
    margin-top: 16px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.reshuffle-btn {
    background: rgba(79, 172, 254, 0.15);
    border: 1px solid rgba(79, 172, 254, 0.4);
    color: #4facfe;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}
.reshuffle-btn:hover {
    background: rgba(79, 172, 254, 0.3);
    color: white;
}
.reset-main-btn {
    background: rgba(255, 85, 85, 0.15);
    border: 1px solid rgba(255, 85, 85, 0.3);
    color: #ff8888;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}
.reset-main-btn:hover {
    background: rgba(255, 85, 85, 0.3);
    color: white;
}

.value-display {
    color: #7affb5;
    font-weight: bold;
    font-family: monospace;
}

/* HUD Instructions
   "Drag to move" text at the bottom.
*/
.instructions {
    position: absolute;
    bottom: 30px;
    width: 100%;
    text-align: center;
    pointer-events: none;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: opacity 0.5s;
}

/* Lock Indicator
   Appears when user clicks to lock the lens position.
*/
#lock-indicator {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    color: #ff5555;
    font-weight: bold;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    background: rgba(0, 0, 0, 0.8);
    padding: 8px 16px;
    border-radius: 6px;
    border: 1px solid rgba(255, 85, 85, 0.4);
    display: none;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    z-index: 100;
}

#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 1px;
    text-align: center;
    width: 100%;
}

@media (max-width: 768px) {
    #ui-layer {
        width: auto;
        left: 10px;
        right: 10px;
        top: auto;
        bottom: 10px;
        max-height: 40vh;
    }
    .ui-header h1 {
        font-size: 1rem;
    }
    #toggle-btn {
        padding: 10px 15px;
        font-size: 1.5rem;
    }
    .preset-btn,
    .model-btn,
    .reshuffle-btn,
    .reset-main-btn {
        padding: 12px 0;
        font-size: 0.85rem;
    }
    input[type="range"] {
        height: 20px;
    }
    .instructions {
        bottom: auto;
        top: 20px;
        font-size: 0.7rem;
    }
    #ui-layer.minimized .control-content {
        display: none;
    }
    #ui-layer.minimized {
        height: auto;
        padding-bottom: 0;
    }
}