body {
    font-family: 'Inter', sans-serif;
    background-color: #f3f4f6;
    padding: 0;
    margin: 0;
    color: #333;
    overflow-x: hidden;
}
.container {
    max-width: 900px;
    width: 100%;
    margin: 2rem auto;
    background-color: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    text-align: center;
}
h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #4CAF50;
}
p {
    font-size: 1rem;
    color: #6b7280;
}
.tool-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 0.75rem;
    text-decoration: none;
    color: #333;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}
.tool-button:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.tool-button h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.tool-button p {
    font-size: 0.9rem;
    color: #6b7280;
}
.button-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}
.tool-container {
    display: none;
    text-align: left;
    margin-top: 2rem;
}
.tool-container.active {
    display: block;
}
.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    color: white;
    padding: 2rem;
    box-sizing: border-box;
    background-image: linear-gradient(to right, #4CAF50, #2196F3);
    animation: fadeIn 1s ease-in-out;
}
.welcome-screen-content {
    animation: slideUp 1.2s ease-in-out;
    max-width: 600px;
    width: 100%;
}
.welcome-screen h1 {
    font-size: 3.5rem;
    font-weight: 800;
    color: white;
    margin: 1rem 0 0.5rem;
}
.welcome-screen p {
    color: #f0f4f8;
    font-size: 1.25rem;
    max-width: 500px;
    margin: 0 auto 2rem;
}
.welcome-button {
    background-color: white;
    color: #4CAF50;
    font-size: 1.25rem;
    font-weight: 700;
    padding: 0.75rem 2rem;
    border-radius: 9999px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
.welcome-button:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}