/* ===== CSS Variables ===== */
:root {
    --bg-primary: #1e1e2e;
    --bg-secondary: #2a2a3e;
    --bg-tertiary: #33334d;
    --bg-input: #2d2d44;
    --text-primary: #e0e0e8;
    --text-secondary: #a0a0b8;
    --text-muted: #707088;
    --accent-primary: #4a9eff;
    --accent-secondary: #3d8be6;
    --accent-success: #4caf50;
    --accent-warning: #ff9800;
    --border-color: #404060;
    --border-focus: #4a9eff;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
}

/* ===== App Container ===== */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ===== Header ===== */
.app-header {
    background: var(--bg-secondary);
    padding: 10px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 15px;
    flex-shrink: 0;
}

.app-header h1 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--accent-primary);
    white-space: nowrap;
}

.version {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

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

/* ===== Main Content Layout ===== */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ===== Controls Panel ===== */
.controls-panel {
    width: 340px;
    min-width: 300px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.controls-panel::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

.controls-panel::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Preview Panel (center) ===== */
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-primary);
    min-width: 0;
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 10px 15px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.preview-header h3 {
    font-size: 1rem;
    font-weight: 500;
    flex-shrink: 0;
}

.preview-info {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: auto;
    flex-shrink: 0;
}

.preview-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 0;
}

#previewCanvas {
    max-width: 100%;
    max-height: 100%;
    display: block;
}

.preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    gap: 10px;
}

.placeholder-icon {
    font-size: 4rem;
    opacity: 0.5;
}

/* ===== Control Groups ===== */
.control-group {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 12px;
}

.control-group h3 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 5px;
}

/* ===== File Controls ===== */
.file-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.info-text {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 5px;
    word-break: break-all;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--accent-primary);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-secondary);
}

.btn-secondary {
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--border-color);
}

.btn-generate {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, var(--accent-success), #45a049);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
}

.btn-generate:hover:not(:disabled) {
    background: linear-gradient(135deg, #45a049, var(--accent-success));
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.8rem;
    background: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-small:hover:not(:disabled) {
    background: var(--border-color);
}

.btn-close {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0 5px;
    line-height: 1;
}

.btn-close:hover {
    color: #ff5555;
}

/* ===== Radio Buttons ===== */
.mode-selector {
    display: flex;
    gap: 15px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.radio-label:hover {
    background: var(--bg-input);
}

.radio-label input[type="radio"] {
    accent-color: var(--accent-primary);
}

.radio-text {
    font-weight: 500;
}

/* ===== Form Elements ===== */
.form-select,
input[type="number"],
input[type="text"] {
    width: 100%;
    padding: 6px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast);
}

.form-select:focus,
input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.2);
}

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

.range-value {
    display: inline-block;
    font-size: 0.8rem;
    color: var(--accent-primary);
    margin-top: 2px;
    text-align: right;
}

/* ===== Params Grid ===== */
.params-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.param-field {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.param-field label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.checkbox-field label {
    flex-direction: row;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

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

/* ===== Output Size ===== */
.output-size {
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

.output-size .param-field {
    flex: 1;
}

.btn-lock {
    padding: 6px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
    margin-bottom: 1px;
}

.btn-lock.locked {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.btn-lock:hover {
    opacity: 0.8;
}

/* ===== G-code Panel (right sidebar) ===== */
.gcode-panel {
    width: 380px;
    min-width: 320px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.gcode-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 15px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.gcode-header h3 {
    font-size: 0.95rem;
    font-weight: 500;
}

.gcode-content {
    flex: 1;
    overflow: auto;
    padding: 10px;
    min-height: 0;
}

.gcode-content::-webkit-scrollbar {
    width: 8px;
}

.gcode-content::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

.gcode-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: var(--radius-sm);
}

.gcode-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

.gcode-footer {
    display: flex;
    gap: 8px;
    padding: 10px 15px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

/* Statistics in G-code panel */
.gcode-stats {
    padding: 10px 15px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.gcode-stats-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.gcode-stats-content {
    font-size: 0.85rem;
    line-height: 1.6;
    display: none;
}

.gcode-stats-content .stat-row {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
}

.stat-label {
    color: var(--text-secondary);
}

.stat-value {
    color: var(--accent-primary);
    font-weight: 600;
}

/* ===== G-code Syntax Highlighting ===== */
.gcode-text {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    padding: 10px;
    border-radius: var(--radius-sm);
    margin: 0;
    white-space: pre;
    tab-size: 4;
}

.gcode-text .gcode-comment {
    color: #6a9955;
    font-style: italic;
}

.gcode-text .gcode-g0 {
    color: #569cd6;
    font-weight: bold;
}

.gcode-text .gcode-g1 {
    color: #dcdcaa;
    font-weight: bold;
}

.gcode-text .gcode-g2,
.gcode-text .gcode-g3 {
    color: #c586c0;
    font-weight: bold;
}

.gcode-text .gcode-g17,
.gcode-text .gcode-g21,
.gcode-text .gcode-g90 {
    color: #4ec9b0;
}

.gcode-text .gcode-m03,
.gcode-text .gcode-m05,
.gcode-text .gcode-m30 {
    color: #ce9178;
    font-weight: bold;
}

.gcode-text .gcode-x {
    color: #9cdcfe;
}

.gcode-text .gcode-y {
    color: #c586c0;
}

.gcode-text .gcode-z {
    color: #dcdcaa;
}

.gcode-text .gcode-f {
    color: #4fc1ff;
}

.gcode-text .gcode-s {
    color: #b5cea8;
}

.gcode-text .gcode-header-line {
    color: var(--text-muted);
}

.gcode-line {
    display: block;
    padding: 2px 4px;
    border-radius: 2px;
    transition: background-color 0.2s ease;
}

.gcode-line-active {
    background-color: rgba(74, 158, 255, 0.2);
    border-left: 3px solid var(--accent-primary);
    padding-left: 1px;
}

/* ===== Modal ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 0;
    max-width: 90%;
    max-height: 90%;
    overflow: auto;
    box-shadow: 0 10px 40px var(--shadow-color);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1rem;
    font-weight: 500;
}

.modal-body {
    padding: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#thresholdPreviewCanvas {
    max-width: 100%;
    max-height: 70vh;
    border: 1px solid var(--border-color);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    background: var(--bg-secondary);
    padding: 30px 40px;
    border-radius: var(--radius-lg);
    box-shadow: 0 5px 30px var(--shadow-color);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ===== Utility Classes ===== */
.hidden {
    display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .gcode-panel {
        width: 300px;
        min-width: 260px;
    }
}

@media (max-width: 900px) {
    .main-content {
        flex-direction: column;
    }

    .controls-panel {
        width: 100%;
        min-width: unset;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .gcode-panel {
        width: 100%;
        min-width: unset;
        max-height: 300px;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }

    .preview-panel {
        min-height: 350px;
    }
}

@media (max-width: 600px) {
    .params-grid {
        grid-template-columns: 1fr;
    }
    
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .controls-panel {
        padding: 10px;
    }
}

/* ===== 3D Viewer Styles ===== */
.preview-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
}

.view-toggle {
    display: flex;
    gap: 0;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: 2px;
}

.btn-view {
    padding: 6px 16px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-view:hover {
    color: var(--text-primary);
}

.btn-view.active {
    background: var(--accent-primary);
    color: #fff;
}

.view-3d-buttons {
    display: flex;
    gap: 4px;
}

.view-3d-buttons .btn-small {
    padding: 4px 8px;
    font-size: 0.75rem;
}

/* Animation Controls */
.animation-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    flex: 1;
    margin-right: 10px;
}

.btn-play {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 4px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

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

.btn-play.playing {
    background: var(--danger);
}

.animation-slider {
    flex: 1;
    min-width: 200px;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    -webkit-appearance: none;
}

.animation-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-success);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    transition: transform 0.1s ease;
}

.animation-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.animation-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--accent-success);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.animation-progress {
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 35px;
    text-align: right;
}

.viewer-3d-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
}

.viewer-3d-container canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Legend for 3D viewer */
.viewer-3d-legend {
    position: absolute;
    bottom: 15px;
    left: 15px;
    background: rgba(42, 42, 62, 0.9);
    padding: 10px 15px;
    border-radius: var(--radius-md);
    font-size: 0.75rem;
    line-height: 1.8;
    backdrop-filter: blur(5px);
    border: 1px solid var(--border-color);
}

.viewer-3d-legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.viewer-3d-legend-color {
    width: 20px;
    height: 3px;
    border-radius: 2px;
}