/* Base Styles */
:root {
    --primary-color: #4a6cf7;
    --text-color: #2d3748;
    --light-gray: #f7fafc;
    --border-color: #e2e8f0;
    --success-color: #48bb78;
    --error-color: #f56565;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
    padding: 3rem;
    text-align: center;
}

h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: #1a202c;
    line-height: 1.2;
}

.message {
    text-align: left;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.message p {
    margin-bottom: 1rem;
}

.form-group {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

input[type="email"] {
    flex: 1;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="email"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.15);
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.btn:hover {
    background-color: #3a5bd9;
}

.btn:active {
    transform: translateY(1px);
}

.btn:disabled {
    background-color: #a0aec0;
    cursor: not-allowed;
}

#form-message {
    margin-top: 1rem;
    font-size: 0.9375rem;
    min-height: 1.5rem;
}

#form-message.success {
    color: var(--success-color);
}

#form-message.error {
    color: var(--error-color);
}

.signature {
    margin-top: 2.5rem;
    font-style: italic;
    color: #4a5568;
}

.signature p {
    margin-bottom: 0.5rem;
}

.small {
    font-size: 0.875rem;
    color: #718096;
    margin-top: 1.5rem !important;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: #3a5bd9;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 640px) {
    body {
        padding: 1.5rem;
    }
    
    .card {
        padding: 2rem 1.5rem;
    }
    
    .form-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        padding: 0.875rem 1rem;
    }
    
    h1 {
        font-size: 1.875rem;
    }
}