@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f0f2f5;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    position: relative;
}

.container {
    background-color: #ffffff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
    text-align: center;
    transition: all 0.3s ease;
}

h1 {
    font-weight: 700;
    color: #1a237e;
    margin-bottom: 10px;
}

h2 {
    color: #c2185b;
}

p {
    color: #555;
    line-height: 1.6;
}

input[type="email"] {
    width: calc(100% - 24px);
    padding: 12px;
    margin-top: 20px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input[type="email"]:focus {
    outline: none;
    border-color: #3f51b5;
}

button {
    background-image: linear-gradient(45deg, #3f51b5 0%, #1a237e 100%);
    color: white;
    border: none;
    padding: 12px 25px;
    margin-top: 20px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(63, 81, 181, 0.4);
}

button:disabled {
    background-image: none;
    background-color: #b0bec5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

#card-display {
    background-color: #e8eaf6;
    border-left: 5px solid #3f51b5;
    margin: 25px 0;
    padding: 15px;
    border-radius: 8px;
    text-align: left;
}

.card-number {
    font-family: 'Courier New', Courier, monospace;
    font-size: 1.2rem;
    font-weight: bold;
    color: #1a237e;
    margin: 10px 0;
    letter-spacing: 2px;
}

.hidden {
    display: none;
}

#error-message {
    color: #d32f2f;
    font-weight: 500;
    margin-top: 15px;
}

#email-input.invalid {
    border-color: #d32f2f;
}

#generate-message {
    color: #555;
    font-size: 0.9rem;
    margin-top: 10px;
}

#admin-panel {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px dashed #b0bec5;
}

textarea {
    width: calc(100% - 24px);
    padding: 12px;
    margin-top: 10px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 14px;
    font-family: 'Roboto', sans-serif;
    resize: vertical;
}

textarea:focus {
    outline: none;
    border-color: #3f51b5;
}

#admin-feedback {
    margin-top: 15px;
    font-weight: 500;
    line-height: 1.5;
}

#admin-toggle-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 20px;
    height: 20px;
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
}