:root {
    --bg-color: #050505;
    --panel-bg: rgba(20, 20, 20, 0.85);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-color: #f0f0f0;
    --text-muted: #aaaaaa;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #10b981;
}

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

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
}

/* 3D Canvas Container */
#viewer-container {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1; /* Below UI */
}

/* UI Overlay container */
#ui-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none; /* Let clicks pass through empty space */
    z-index: 10;
    display: flex;
    flex-direction: column;
    padding: 20px;
    gap: 15px;
    overflow-y: auto;
}

/* Let the children receive pointer events */
#ui-overlay > * {
    pointer-events: auto;
}

header {
    margin-bottom: 5px;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #fff;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.8);
}

/* Panels */
.panel {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    width: 320px;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.panel h2 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: #fff;
}

/* Forms & Inputs */
.input-group {
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.input-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.checkbox-group {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-group label {
    font-size: 0.9rem;
    color: var(--text-muted);
    cursor: pointer;
}

input[type="checkbox"] {
    cursor: pointer;
    width: 16px;
    height: 16px;
    accent-color: var(--accent-color);
}

select {
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    padding: 5px;
    font-size: 0.85rem;
    outline: none;
}

select:focus {
    border-color: var(--accent-color);
}

input[type="range"] {
    width: 100%;
    accent-color: var(--accent-color);
    cursor: pointer;
}

input[type="file"] {
    font-size: 0.85rem;
    padding: 5px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
}

button {
    width: 100%;
    padding: 10px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 5px;
}

button:hover {
    background-color: var(--accent-hover);
}

button:disabled {
    background-color: #555;
    cursor: not-allowed;
    color: #888;
}

/* Modal */
.modal {
    margin: auto;
    background: transparent;
    border: none;
    padding: 0;
    overflow: visible;
}

.modal::backdrop {
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(3px);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: auto;
    margin: 0;
    line-height: 1;
}

.close-btn:hover {
    color: #fff;
    background: transparent;
}

/* FAB */
#settings-fab {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 20;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    transition: background-color 0.2s, transform 0.2s;
    margin: 0;
    padding: 0;
}

#settings-fab:hover {
    background: var(--accent-color);
    transform: scale(1.05);
}

/* Toasts */
#toast-container {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
    pointer-events: none;
}

.toast {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    width: 320px;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease-out forwards;
    pointer-events: auto;
}

.toast.fade-out {
    animation: fadeOut 0.3s ease-out forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(10px);
    }
}

.toast-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.toast-header h3 {
    font-size: 1rem;
    color: #fff;
    margin: 0;
}

.toast-text {
    font-size: 0.9rem;
    margin-bottom: 10px;
    word-break: break-word;
}

.toast-progress-container {
    width: 100%;
    height: 6px;
    background-color: rgba(0,0,0,0.5);
    border-radius: 3px;
    overflow: hidden;
}

.toast-progress-bar {
    height: 100%;
    width: 0%;
    background-color: var(--accent-color);
    transition: width 0.1s ease-out, background-color 0.3s;
}

.toast-progress-bar.success {
    background-color: var(--success-color);
}

.toast-progress-bar.error {
    background-color: #ef4444;
}

/* Spinner */
.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Entity Inspector */
.inspector-panel {
    max-height: 400px;
    display: flex;
    flex-direction: column;
}

.entity-classname {
    font-weight: bold;
    color: var(--accent-color);
    margin-bottom: 10px;
    font-size: 1rem;
}

.entity-properties {
    overflow-y: auto;
    font-size: 0.85rem;
    flex-grow: 1;
}

.property-row {
    display: flex;
    padding: 4px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.property-key {
    color: var(--text-muted);
    width: 40%;
    flex-shrink: 0;
    padding-right: 10px;
    word-break: break-all;
}

.property-value {
    color: #fff;
    width: 60%;
    word-break: break-all;
}

/* Controls Cheat Sheet */
.controls-panel ul {
    list-style: none;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.controls-panel li {
    margin-bottom: 8px;
    display: flex;
    align-items: center;
}

kbd {
    background-color: #333;
    border: 1px solid #555;
    border-radius: 3px;
    box-shadow: 0 1px 1px rgba(0,0,0,0.2), 0 2px 0 0 rgba(255,255,255,0.1) inset;
    color: #eee;
    display: inline-block;
    font-family: monospace;
    font-size: 0.8em;
    padding: 2px 6px;
    margin: 0 4px;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    #ui-overlay {
        padding: 10px;
    }

    .panel {
        width: 100%;
        max-width: 100%;
    }

    /* Optional: hide controls on very small screens to save space */
    .controls-panel {
        display: none;
    }
}

/* Full-Screen Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #050505;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    visibility: visible;
}

.loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loading-content {
    background: rgba(20, 20, 20, 0.95);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    width: 90%;
    max-width: 420px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
    text-align: center;
    backdrop-filter: blur(10px);
}

.loading-content h2 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #fff;
    margin: 0;
}

.loading-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
    min-height: 2.5em;
    display: flex;
    align-items: center;
    justify-content: center;
}

.large-spinner {
    width: 42px;
    height: 42px;
    border: 4px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 0.9s cubic-bezier(0.6, 0.2, 0.4, 0.8) infinite;
}

.loading-bar-container {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.loading-bar-fill {
    height: 100%;
    width: 0%;
    background-color: var(--accent-color);
    transition: width 0.15s ease-out;
}