:root {
    --bg-main: #121214;
    --bg-card: #1a1a1e;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --border: #2d2d34;
}
body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}
.app-container {
    width: 100%;
    max-width: 900px;
    background: var(--bg-card);
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border);
}
header h1 {
    margin: 0 0 4px 0;
    font-size: 24px;
}
header p {
    color: var(--text-muted);
    margin: 0 0 20px 0;
    font-size: 14px;
}
.upload-zone {
    border: 2px dashed var(--border);
    padding: 30px;
    text-align: center;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.02);
    margin-bottom: 20px;
}
.upload-btn {
    background: var(--accent);
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    display: inline-block;
    font-weight: 600;
    transition: background 0.2s;
}
.upload-btn:hover { background: var(--accent-hover); }
#fileName {
    display: block;
    margin-top: 10px;
    color: var(--text-muted);
    font-size: 13px;
}
.editor-workspace {
    display: flex;
    flex-direction: column;
    gap: 16px;
}