/* RTI Viewer Styles */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --background: #0f172a;
    --surface: #1e293b;
    --surface-light: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #475569;
    --accent: #38bdf8;
    --success: #22c55e;
    --warning: #f59e0b;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    padding: 1.5rem 2rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.header .subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

/* Upload Section */
.upload-section {
    max-width: 600px;
    width: 100%;
    margin-top: 2rem;
}

.upload-area {
    background: var(--surface);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: var(--surface-light);
}

.upload-icon {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
}

.upload-area h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.file-types {
    font-size: 0.85rem;
    color: var(--secondary-color) !important;
    margin-bottom: 1.5rem !important;
}

.upload-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s ease;
}

.upload-btn:hover {
    background: var(--primary-dark);
}

.demo-section {
    margin-top: 2rem;
    text-align: center;
}

.demo-section p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.demo-btn {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.5rem;
    font-size: 0.9rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.demo-btn:hover {
    background: var(--surface);
    border-color: var(--accent);
}

/* Viewer Section */
.viewer-section {
    display: flex;
    gap: 2rem;
    width: 100%;
    max-width: 1400px;
}

.viewer-container {
    flex: 1;
    position: relative;
    background: var(--surface);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
}

#rtiCanvas {
    max-width: 100%;
    max-height: 80vh;
    display: block;
}

/* Light Control */
.light-control {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 120px;
    height: 120px;
    background: rgba(30, 41, 59, 0.95);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.light-control::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle at center, transparent 0%, transparent 40%, rgba(255,255,255,0.05) 100%);
}

.light-control::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 100%;
    background: var(--border-color);
}

.light-indicator {
    width: 20px;
    height: 20px;
    background: var(--accent);
    border-radius: 50%;
    position: absolute;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px var(--accent), 0 0 20px rgba(56, 189, 248, 0.5);
    pointer-events: none;
    left: 50%;
    top: 50%;
}

/* Controls Panel */
.controls-panel {
    width: 300px;
    background: var(--surface);
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.control-group {
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.control-group:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.control-group h3 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
}

/* View Mode Buttons */
.view-modes {
    display: flex;
    gap: 0.5rem;
}

.mode-btn {
    flex: 1;
    padding: 0.6rem 0.75rem;
    background: var(--surface-light);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-btn:hover {
    background: var(--surface);
    color: var(--text-primary);
}

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

/* Light Position Display */
.light-position-display {
    display: flex;
    gap: 1.5rem;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.control-hint {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Slider Controls */
.slider-control {
    margin-bottom: 1rem;
}

.slider-control:last-child {
    margin-bottom: 0;
}

.slider-control label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.slider-control input[type="range"] {
    width: calc(100% - 40px);
    height: 4px;
    background: var(--surface-light);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    vertical-align: middle;
}

.slider-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.slider-control input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.slider-control span {
    display: inline-block;
    width: 35px;
    text-align: right;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--accent);
    vertical-align: middle;
}

/* Image Info */
.image-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.image-info span {
    color: var(--text-primary);
}

/* New File Button */
.new-file-btn {
    background: var(--surface-light);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 0.75rem;
    font-size: 0.9rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: auto;
}

.new-file-btn:hover {
    background: var(--surface);
    border-color: var(--accent);
}

/* Footer */
.footer {
    padding: 1.5rem 2rem;
    background: var(--surface);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.footer .credits {
    margin-top: 0.5rem;
    font-size: 0.8rem;
}

.footer a {
    color: var(--accent);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--surface-light);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

.loading-overlay p {
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 900px) {
    .viewer-section {
        flex-direction: column;
    }

    .controls-panel {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
    }

    .control-group {
        flex: 1;
        min-width: 200px;
        border-bottom: none;
        padding-bottom: 0;
    }

    .light-control {
        width: 100px;
        height: 100px;
    }
}

@media (max-width: 600px) {
    .main-content {
        padding: 1rem;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .controls-panel {
        flex-direction: column;
    }

    .control-group {
        padding-bottom: 1rem;
        border-bottom: 1px solid var(--border-color);
    }
}