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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #ffffff;
    color: #333;
}

#app {
    min-height: 100vh;
    position: relative;
}

#datetime {
    position: fixed;
    top: 20px;
    right: 20px;
    font-size: 14px;
    color: #666;
    z-index: 100;
}

.screen {
    display: none;
    padding: 60px 20px 20px;
    animation: fadeIn 0.3s ease-in;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.logo {
    text-align: center;
    font-size: 48px;
    font-weight: bold;
    color: #0028aa;
    margin-bottom: 30px;
}

.title {
    text-align: center;
    font-size: 28px;
    color: #333;
    margin-bottom: 40px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0028aa;
}

.input-button-group {
    display: flex;
    gap: 10px;
}

.input-button-group input {
    flex: 1;
}

.btn-primary {
    background-color: #0028aa;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-primary:hover {
    background-color: #001a80;
}

.btn-secondary {
    background-color: transparent;
    color: #0028aa;
    border: 2px solid #0028aa;
    padding: 12px 24px;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background-color: #0028aa;
    color: white;
}

.btn-back {
    position: absolute;
    top: 20px;
    left: 20px;
    background: none;
    border: none;
    font-size: 32px;
    cursor: pointer;
    color: #0028aa;
    transition: transform 0.2s;
}

.btn-back:hover {
    transform: translateX(-5px);
}

.error-message {
    color: #d32f2f;
    font-size: 14px;
    display: block;
    margin-top: 5px;
}

.card {
    background-color: #f9f9f9;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
}

.contact-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contact-actions {
    display: flex;
    gap: 10px;
}

.icon-btn {
    background-color: #0028aa;
    color: white;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.icon-btn:hover {
    background-color: #001a80;
}

.divider {
    height: 1px;
    background-color: #0028aa;
    margin: 30px 0;
}

h2 {
    font-size: 18px;
    color: #333;
    margin-bottom: 20px;
}

h3 {
    font-size: 20px;
    color: #333;
    margin-bottom: 20px;
}

.acuerdo-card {
    background-color: #f9f9f9;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
}

.acuerdo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    transition: background-color 0.3s;
    cursor: pointer;
}

.acuerdo-item:hover {
    background-color: #f0f0f0;
}

.acuerdo-header {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
}

.acuerdo-fecha {
    color: #666;
    font-size: 14px;
}

.btn-expand {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #0028aa;
    padding: 5px 10px;
}

.productos-saldo {
    padding: 15px 20px;
    background-color: #ffffff;
    border-top: 1px solid #e0e0e0;
}

.producto-saldo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    font-size: 14px;
    color: #555;
}

.producto-saldo-item .saldo {
    font-weight: 600;
    color: #0028aa;
}

.product-form {
    background-color: #f9f9f9;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.form-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 20px;
    gap: 10px;
}

.product-item {
    background-color: #ffffff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.product-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.product-date {
    font-size: 18px;
    font-weight: 600;
    color: #0028aa;
}

.product-actions {
    display: flex;
    gap: 10px;
}

.btn-icon {
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn-icon:hover {
    transform: scale(1.2);
}

.product-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.product-detail-item {
    font-size: 14px;
}

.product-detail-item strong {
    color: #666;
    display: block;
    margin-bottom: 4px;
}

.product-detail-item span {
    color: #333;
    font-size: 15px;
}

.product-observations {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
    font-size: 14px;
}

.product-observations strong {
    color: #666;
    display: block;
    margin-bottom: 5px;
}

.popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.popup.active {
    display: flex;
}

.popup-content {
    background-color: white;
    padding: 40px;
    border-radius: 8px;
    text-align: center;
    max-width: 400px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.popup-content p {
    font-size: 18px;
    margin-bottom: 30px;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .logo {
        font-size: 36px;
    }

    .title {
        font-size: 22px;
    }

    .input-button-group {
        flex-direction: column;
    }

    .form-actions {
        flex-direction: column;
    }

    .contact-info {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    #datetime {
        font-size: 12px;
        top: 10px;
        right: 10px;
    }

    .acuerdo-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }

    .product-details {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .screen {
        padding: 50px 15px 15px;
    }

    .btn-back {
        font-size: 24px;
        top: 15px;
        left: 15px;
    }

    .productos-saldo {
        padding: 10px 15px;
    }
}