:root {
    --background-color-1: #ffefe8;
    --background-color-2: #c5e1ff;
    --envelope-color: #4a90e2;
    --flap-color: #2c3e50;
    --text-color: #2c3e50;
    --border-color: #bdc3c7;
    --button-hover: #357abd;
    --white: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.15);
}

/* Body Styles */
body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--background-color-1), var(--background-color-2));
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

/* Envelope Styles */
.envelope {
    width: 500px;
    height: 400px;
    background-color: var(--envelope-color);
    position: relative;
    z-index: 1; 
    border-radius: 10px;
    box-shadow: 0 4px 8px var(--shadow-color);
    overflow: hidden;
    margin-bottom: 5px;
}

/* Letter/Form Styles */
.letter {
    padding: 20px;
    background-color: var(--white);
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    bottom: 20px;
    z-index: 2;
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    gap: 0;
}

h1 {
    color: var(--text-color);
    text-align: center;
    margin: 0;
    padding: 10px 0;
    font-size: 1.5em;
}


h2 {
    color: var(--text-color);
    text-align: center;
    margin: 0;
    padding: 10px 0;
    font-size: 1em;
}

/* Form Label, Input, and Textarea Styles */
.letter label, .letter input, .letter textarea {
    display: block;
    width: 100%;
    margin-top: 10px;
    margin-bottom: 10px;
    box-sizing: border-box;
}

/* Form Input and Textarea Styles */
.letter input, .letter textarea {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 3px;
    transition: border-color 0.3s ease;
}

.letter textarea {
    height: calc(100% - 110px); /* Adjust for header and input heights */
    resize: none;
}

/* Form Input and Textarea Focus Styles */
.letter input:focus, .letter textarea:focus {
    outline: none;
    border-color: var(--flap-color);
}

/* Submit Button Styles */
.letter input[type="submit"] {
    background-color: var(--flap-color);
    color: var(--white);
    cursor: pointer;
    transition: background-color 0.3s ease;
    padding: 10px;
    margin: 0;
    width: 100%;
}

/* Submit Button Hover Styles */
.letter input[type="submit"]:hover {
    background-color: var(--button-hover);
}