:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --background-color: #f0f4f8;
    --text-color: #1e293b;
    --error-color: #dc2626;
    --success-color: #16a34a;
    --card-background: #ffffff;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    padding: 2rem;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 1rem;
    color: white;
}

.subtitle {
    margin-top: 1rem;
    opacity: 0.9;
}

.card {
    background-color: var(--card-background);
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    padding: 2rem;
    margin-bottom: 2rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
}

h2 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: all 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.button {
    padding: 0.75rem 1.5rem;
    background-color: #64748b;
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

.button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.button.primary {
    background-color: var(--primary-color);
}

.button.primary:hover {
    background-color: var(--secondary-color);
}

.hidden {
    display: none;
}

@media (max-width: 640px) {
    .input-group {
        flex-direction: column;
    }
    
    .button {
        width: 100%;
    }
}