:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --accent: #8b5cf6;
    --bg: #f1f5f9;
    --panel: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', system-ui, sans-serif;
    margin: 0;
    padding: 20px;
}

.app-shell {
    max-width: 1100px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: var(--primary-dark);
    font-size: 2.2rem;
    margin-bottom: 5px;
}

.panel {
    background: var(--panel);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 25px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.05);
    border: 1px solid var(--border);
}

.panel h2 {
    font-size: 1.2rem;
    margin-top: 0;
    border-left: 5px solid var(--primary);
    padding-left: 15px;
    margin-bottom: 25px;
}

.panel h3 {
    font-size: 1rem;
    color: var(--text-light);
    margin-top: 30px;
    background: #f8fafc;
    padding: 10px 15px;
    border-radius: 8px;
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

@media (max-width: 768px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }

label { font-size: 0.85rem; font-weight: 600; color: var(--text-light); }

input, textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-top: 5px;
    font-size: 0.95rem;
    box-sizing: border-box;
    background: #fcfcfc;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.file-input-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px;
    border: 2px dashed var(--border);
    border-radius: 20px;
    cursor: pointer;
    transition: 0.3s;
}

.file-input-label:hover {
    background: #f8fafc;
    border-color: var(--primary);
}

.file-input-label input { display: none; }
.upload-icon { font-size: 2.5rem; margin-bottom: 10px; }

.button-row { display: flex; gap: 15px; margin-top: 25px; }

button {
    flex: 1;
    border: none;
    padding: 16px;
    border-radius: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    font-size: 1rem;
}

button.primary { background: var(--primary); color: white; }
button.primary:hover { background: var(--primary-dark); }
button.accent { background: var(--accent); color: white; }
button.accent:hover { opacity: 0.9; }
button:disabled { background: #cbd5e1; cursor: not-allowed; }

.info-box {
    margin: 15px 0;
    padding: 15px;
    background: #f8fafc;
    border-radius: 12px;
    font-size: 0.9rem;
    border: 1px solid var(--border);
}

#logArea, #jsonOutput {
    background: #1e293b;
    color: #94a3b8;
    font-family: 'Courier New', monospace;
    font-size: 0.8rem;
    border: none;
}