:root {
    --bg-primary: #0d0d0d;
    --bg-secondary: #161616;
    --bg-tertiary: #1f1f1f;
    --border: #2a2a2a;
    --text-primary: #f5f5f5;
    --text-secondary: #888;
    --accent: #e0e0e0;
    --accent-hover: #fff;
    --success: #4a9f6e;
    --error: #c45c5c;
    --pdf-color: #a0a0a0;
    --dxf-color: #f0f0f0;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 24px;
}

header {
    text-align: center;
    margin-bottom: 48px;
}

h1 {
    font-size: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 24px;
}

@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
}

.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header h2 {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-body {
    padding: 20px;
}

.upload-zone {
    border: 1px dashed var(--border);
    border-radius: 8px;
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--bg-tertiary);
}

.upload-zone:hover {
    border-color: var(--accent);
}

.upload-zone.dragover {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.02);
}

.upload-zone.has-file {
    display: none;
}

.upload-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    color: var(--text-secondary);
}

.upload-zone p {
    font-size: 0.95rem;
    margin-bottom: 4px;
}

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

.file-info {
    display: none;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    margin-bottom: 16px;
}

.file-info.show {
    display: flex;
}

.file-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.file-icon svg {
    width: 24px;
    height: 24px;
    color: var(--text-secondary);
}

.file-details {
    flex: 1;
    min-width: 0;
}

.file-name {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.btn-remove {
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-secondary);
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-remove:hover {
    background: var(--bg-primary);
    color: var(--error);
}

.btn-remove svg {
    width: 16px;
    height: 16px;
}

.btn {
    width: 100%;
    padding: 14px 24px;
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-convert {
    background: var(--text-primary);
    color: var(--bg-primary);
    margin-top: 16px;
}

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

.btn-convert:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-download {
    background: var(--success);
    color: white;
    margin-top: 16px;
}

.btn-download:hover {
    filter: brightness(1.1);
}

.status {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    margin-top: 16px;
    border-radius: 8px;
    font-size: 0.9rem;
}

.status.show {
    display: flex;
}

.status.processing {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.status.error {
    background: rgba(196, 92, 92, 0.1);
    color: var(--error);
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--text-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.results {
    display: none;
    margin-top: 20px;
}

.results.show {
    display: block;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}

.stat {
    text-align: center;
    padding: 12px 8px;
    background: var(--bg-tertiary);
    border-radius: 6px;
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.preview-card .card-body {
    padding: 0;
}

.canvas-container {
    position: relative;
    height: 450px;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.canvas-container canvas {
    position: absolute;
    max-width: 100%;
    max-height: 100%;
}

#pdfCanvas {
    opacity: 0.6;
}

#dxfCanvas {
    z-index: 1;
}

.placeholder {
    text-align: center;
    color: var(--text-secondary);
}

.placeholder svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.3;
}

.placeholder p {
    font-size: 0.9rem;
}

.view-controls {
    display: flex;
    gap: 8px;
}

.view-btn {
    padding: 6px 12px;
    font-size: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.view-btn.active {
    background: var(--bg-primary);
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.legend {
    display: flex;
    gap: 24px;
    padding: 12px 20px;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.legend-color {
    width: 16px;
    height: 2px;
}

.legend-pdf {
    background: var(--pdf-color);
}

.legend-dxf {
    background: var(--dxf-color);
}

footer {
    text-align: center;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
}