/* Estilos para el buzón de sugerencias y animación de carta */
.suggestion-form-section {
    margin: 40px auto 30px auto;
    max-width: 600px;
    background: var(--color_4);
    border: 2px solid var(--color_3);
    border-radius: 18px;
    padding: 30px 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    position: relative;
}
#suggestion-form {
    display: flex;
    flex-direction: column;
    gap: 18px;
}
.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
#suggestion-form textarea {
    padding: 8px 10px;
    border-radius: 6px;
    border: 1.5px solid var(--color_3);
    font-size: 1rem;
}
#suggestion-form button[type="submit"] {
    background: var(--color_3);
    color: var(--color_1);
    border: none;
    border-radius: 8px;
    padding: 12px 0;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 10px;
    transition: background 0.2s;
}
#suggestion-form button[type="submit"]:hover {
    background: var(--color_2);
}
#suggestion-message {
    margin-top: 18px;
    font-size: 1.1rem;
    text-align: center;
}
.envelope-animation {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 30px;
    animation: fadeIn 0.5s;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.envelope {
    position: relative;
    width: 120px;
    height: 80px;
    margin-bottom: 10px;
}
.envelope-flap {
    position: absolute;
    top: 0;
    left: 0;
    width: 120px;
    height: 40px;
    background: var(--color_3);
    border-top-left-radius: 12px 24px;
    border-top-right-radius: 12px 24px;
    z-index: 3;
    transform-origin: top center;
    animation: flapClose 1.2s forwards;
}
@keyframes flapClose {
    0% { transform: rotateX(0deg); }
    60% { transform: rotateX(-80deg); }
    100% { transform: rotateX(-90deg); }
}
.envelope-body {
    position: absolute;
    top: 20px;
    left: 0;
    width: 120px;
    height: 60px;
    background: var(--color_1);
    border: 2px solid var(--color_3);
    border-bottom-left-radius: 12px 24px;
    border-bottom-right-radius: 12px 24px;
    z-index: 1;
}
.envelope-letter {
    position: absolute;
    top: 10px;
    left: 20px;
    width: 80px;
    height: 50px;
    background: var(--color_4);
    border: 1.5px solid var(--color_3);
    border-radius: 6px;
    z-index: 2;
    animation: letterSlide 1.2s forwards;
}
@keyframes letterSlide {
    0% { top: 60px; opacity: 0; }
    60% { top: 10px; opacity: 1; }
    100% { top: 10px; opacity: 1; }
}
.envelope-text {
    color: var(--color_3);
    font-weight: bold;
    font-size: 1.1rem;
    margin-top: 8px;
}