:root {
    --azul: #219BEF;
    --azul-oscuro: #176BAA;
    --azul-claro: #61B7F1;
    --azul-hover: #1a7cc0;
    --azul-extra-claro: #EBF6FF;
    --negro: #000000;
    --gris-claro: #f5f5f5;
    --gris-oscuro: #333333;
    --blanco: #ffffff;
    --sombra-suave: 0 2px 10px rgba(0, 0, 0, 0.1);
    --sombra-media: 0 4px 12px rgba(0, 0, 0, 0.15);
    --transicion: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
}


body {
    background: var(--blanco);
    min-height: 100vh;
    color: var(--negro);
    line-height: 1.6;
}

.listado{
    display: flex;
    justify-content: center;
    margin-top: -30px;
}

.listado img{
    width: 50%;
}

.nav-container {
    background: var(--blanco);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 50px;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--sombra-suave);
}

.logo {
    height: 40px;
    transition: var(--transicion);
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    color: var(--negro);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transicion);
    padding: 8px 16px;
    border-radius: 20px;
}

.nav-links a:hover {
    background: var(--azul-extra-claro);
    color: var(--azul);
}

.billing-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 50px 20px;
}

.billing-hero {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.billing-hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--azul);
}

.subtitle {
    font-size: 1.2rem;
    color: var(--gris-oscuro);
}

.billing-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

.billing-form-container {
    background: var(--blanco);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--sombra-media);
}

.form-header {
    text-align: center;
    margin-bottom: 40px;
}

.form-header h2 {
    color: var(--azul);
    font-size: 2rem;
    margin-bottom: 10px;
}

.form-header p {
    color: var(--gris-oscuro);
}

.form-section {
    margin-bottom: 40px;
    padding: 20px;
    background: var(--gris-claro);
    border-radius: 15px;
}

.form-section h3 {
    color: var(--azul);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.form-group {
    margin-bottom: 25px;
    position: relative;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group.floating {
    margin-bottom: 25px;
    position: relative;
    padding-top: 15px;
}

.form-group.floating input {
    width: 100%;
    padding: 15px;
    background: var(--blanco);
    border: 2px solid var(--gris-claro);
    border-radius: 10px;
    color: var(--negro);
    font-size: 1rem;
    transition: var(--transicion);
}

.form-group.floating label {
    position: absolute;
    left: 15px;
    top: 30px;
    color: var(--gris-oscuro);
    transition: all 0.3s ease;
    pointer-events: none;
    background: transparent;
    padding: 0 5px;
}

.form-group.floating input:focus + label,
.form-group.floating input:not(:placeholder-shown) + label {
    top: 0;
    left: 10px;
    font-size: 0.85rem;
    color: var(--azul);
    background: var(--blanco);
}

.form-group.floating input:focus,
.form-group.floating input:not(:placeholder-shown) {
    border-color: var(--azul);
}

.form-group.floating input::placeholder {
    color: transparent;
}

.form-group.error input {
    border-color: #ff4444;
}

.form-group.error label {
    color: #ff4444;
}

.error-message {
    color: #ff4444;
    font-size: 0.85rem;
    margin-top: 5px;
    position: absolute;
    bottom: -20px;
}

.submit-btn {
    width: 100%;
    padding: 18px;
    background: var(--azul);
    color: var(--blanco);
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: var(--transicion);
}

.submit-btn:hover {
    background: var(--azul-hover);
    transform: translateY(-3px);
    box-shadow: var(--sombra-media);
}

.billing-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-card {
    background: var(--blanco);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--sombra-media);
    transition: var(--transicion);
    border: 2px solid var(--gris-claro);
}

.info-card:hover {
    transform: translateY(-5px);
    border-color: var(--azul);
}

.info-icon {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--azul);
}

.info-card h3 {
    color: var(--azul);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.info-card p, .info-card ul {
    color: var(--gris-oscuro);
}

.info-card ul {
    list-style-position: inside;
    margin-left: 0;
}

.info-card li {
    margin-bottom: 10px;
}

.footer {
    background: var(--negro);
    padding: 60px 20px 30px;
    margin-top: 80px;
    color: var(--blanco);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-section h3 {
    color: var(--azul-claro);
    margin-bottom: 20px;
}

.footer-bottom {
    max-width: 1200px;
    margin: 40px auto 0;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
}

@media (max-width: 992px) {
    .billing-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-container {
        padding: 15px 20px;
    }

    .billing-hero h1 {
        font-size: 2.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .billing-hero h1 {
        font-size: 2rem;
    }

    .billing-form-container {
        padding: 20px;
    }

    .form-section {
        padding: 15px;
    }
}