.grammar-ai-container {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 28px;
    max-width: 650px;
    margin: 30px auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}
.grammar-ai-container h3 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 24px;
    color: #1e293b;
    text-align: center;
}
.grammar-instructions {
    text-align: center;
    color: #64748b;
    margin-bottom: 20px;
    font-size: 15px;
}
.grammar-ai-container textarea {
    width: 100%;
    height: 180px;
    padding: 16px;
    margin-bottom: 20px;
    border: 2px solid #cbd5e1;
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 16px;
    resize: vertical;
    line-height: 1.5;
}
.grammar-ai-container textarea:focus {
    outline: none;
    border-color: #3b82f6;
}
.grammar-ai-container button {
    width: 100%;
    padding: 16px;
    background: #10b981;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s;
}
.grammar-ai-container button:hover {
    background: #059669;
}
.grammar-ai-container button:disabled {
    background: #94a3b8;
    cursor: not-allowed;
}
#grammar-loading {
    margin-top: 20px;
    font-style: italic;
    color: #64748b;
    text-align: center;
    font-weight: 600;
}
#grammar-result {
    margin-top: 24px;
}
.grammar-success {
    background: #f8fafc;
    padding: 20px;
    border-left: 5px solid #10b981;
    line-height: 1.8;
    border-radius: 0 8px 8px 0;
    color: #334155;
    font-size: 16px;
}
.grammar-error {
    background: #fef2f2;
    padding: 16px;
    border-left: 5px solid #ef4444;
    color: #991b1b;
    border-radius: 0 8px 8px 0;
}