:root {
    --azul-celeste: #0852f3ff;
    --azul-oscuro: #033874ff;
    --azul-header: #021a3a; /* Nuevo color más oscuro para el header */
    --amarillo: #ffc107;
    --rojo: #dc3545;
    --blanco: #f8f9fa;
    --gris-claro: #ccd4e2;
}

body {
    background: linear-gradient(120deg, var(--azul-celeste) 0%, var(--azul-oscuro) 100%);
    color: #222;
    font-family: 'Montserrat', Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.teceec-header {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
    background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-header) 80%, var(--azul-celeste) 100%);
}
.navbar {       
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
    background: linear-gradient(135deg, var(--azul-header), var(--azul-oscuro) 80%, var(--azul-celeste) 100%);
}

.navbar-nav .nav-link {
    font-weight: 600;
    color: var(--blanco) !important;
    position: relative;
    padding-bottom: 4px;
    letter-spacing: 0.5px;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    left: 10%;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--amarillo);
    transition: width 0.3s;
}

.navbar-nav .nav-link:hover::after {
    width: 80%;
}

.navbar-nav .nav-link:hover {
    color: var(--amarillo) !important;
    text-shadow: 0 0 8px var(--amarillo);
}

main {
    flex: 1;
}

.navlogo-img {
    width: 60px;
    height: auto;
}

.bg-gradient-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.3));
  z-index: 1;
}
.bg-gradient-hero .content {
  position: relative;
  z-index: 2;
}

.bg-gradient-hero {
    background: linear-gradient(135deg, var(--azul-celeste) 0%, var(--azul-oscuro) 50%, var(--amarillo) 100%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-btn {
    background: linear-gradient(90deg, var(--amarillo) 60%, var(--rojo) 100%);
    color: #fff;
    border: none;
    font-weight: 700;
    font-size: 1.2rem;
    border-radius: 40px;
    box-shadow: 0 4px 24px var(--azul-celeste);
    transition: background 0.3s, color 0.3s, box-shadow 0.3s;
}

.hero-btn:hover {
    background: linear-gradient(90deg, var(--rojo) 60%, var(--amarillo) 100%);
    color: #fff;
    box-shadow: 0 8px 32px var(--rojo);
}



.btn-outline-danger,
.btn-outline-primary {
    border-radius: 30px;
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    transition: background 0.3s, color 0.3s;
}

.btn-outline-danger:hover,
.btn-outline-primary:hover {
    background: var(--amarillo);
    color: #212529;
    border-color: var(--amarillo);
}

.logo-header {
    width: 55px;
    height: auto;
}

.pulse-icon {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.icon-box {
    background-color: #ffffff10;
    padding: 0.75rem;
    border-radius: 50%;
    box-shadow: 0 0 10px var(--azul-celeste);
}

/* Categoría mini hero */
.categoria-hero {
    background: linear-gradient(135deg, var(--azul-celeste), var(--azul-oscuro) 80%);
    box-shadow: 0 4px 24px var(--azul-celeste);
    border-radius: 24px;
    position: relative;
    overflow: hidden;
}

.categoria-hero .categoria-icon {
    font-size: 3rem;
    color: var(--amarillo);
    margin-right: 12px;
}

.categoria-hero .categoria-bg {
    position: absolute;
    top: 0;
    right: 0;
    font-size: 100px;
    opacity: 0.08;
    color: var(--rojo);
    z-index: 1;
}

.categoria-hero .categoria-content {
    position: relative;
    z-index: 2;
}

/* Tarjetas de cursos */
.flip-box {
    perspective: 1000px;
    height: 340px;
    margin-bottom: 1rem;
    cursor: pointer;
}

.flip-box-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s ease;
    transform-style: preserve-3d;
}

.flip-box.flipped .flip-box-inner {
    transform: rotateY(180deg);
}

.flip-box-front,
.flip-box-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 18px;
}

.flip-box-front {
    background: linear-gradient(135deg, var(--blanco) 80%, var(--azul-celeste) 100%);
    box-shadow: 0 4px 16px var(--azul-celeste);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
}

.flip-box-back {
    background: linear-gradient(135deg, var(--azul-celeste) 80%, var(--blanco) 100%);
    color: #fff;
    box-shadow: 0 4px 16px var(--rojo);
    transform: rotateY(180deg);
    padding: 2rem 1rem;
}

.img-curso-hover {
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border: 2px solid var(--blanco);
    padding: 4px;
    background-color: #fff;
    max-height: 120px;
    object-fit: contain;
    margin-bottom: 1rem;
}

.img-curso-hover:hover {
    transform: scale(1.07);
    box-shadow: 0 6px 18px var(--azul-celeste);
    border-color: var(--amarillo);
}

.flip-box-front h5 {
    font-weight: 700;
    color: var(--azul-oscuro);
    margin-bottom: 0.5rem;
}

.flip-box-front i {
    font-size: 2.2rem;
    color: var(--amarillo);
    margin-top: 0.5rem;
}

.flip-box-back p {
    font-size: 1rem;
    margin-bottom: 0.7rem;
}

.flip-box-back .btn {
    background: linear-gradient(90deg, var(--rojo) 60%, var(--amarillo) 100%);
    color: #fff;
    font-weight: 700;
    border-radius: 30px;
    border: none;
    box-shadow: 0 2px 8px var(--rojo);
    transition: background 0.3s, color 0.3s;
}

.flip-box-back .btn:hover {
    background: linear-gradient(90deg, var(--amarillo) 60%, var(--rojo) 100%);
    color: #fff;
}

/* Footer */
footer {
    margin-top: auto;
    background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-celeste));
    color: #fff;
    border-top: 3px solid var(--amarillo);
}

footer a {
    color: var(--amarillo);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    color: var(--rojo);
    text-decoration: underline;
}
/* Botón flotante de WhatsApp */
.whatsapp-btn {
    position: fixed;
    bottom: 24px;
    right: 24px; /* Cambiado a derecha */
    z-index: 1000;
    background: var(--amarillo);
    color: var(--azul-celeste);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 16px var(--azul-celeste);
    font-size: 2rem;
    transition: background 0.3s, color 0.3s;
}
.whatsapp-btn:hover {
    background: var(--rojo);
    color: var(--blanco);
}


@media (max-width: 992px) {
    .flip-box {
        height: 380px;
    }
}

@media (max-width: 768px) {
    .flip-box {
        height: 320px;
    }

    .categoria-hero {
        padding: 2rem 1rem;
    }

    .flip-box-front,
    .flip-box-back {
        padding: 1rem;
    }

    .navbar-nav .nav-link {
        font-size: 1rem;
    }

    footer {
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .flip-box {
        height: 260px;
    }

    .flip-box-front h5 {
        font-size: 1rem;
    }

    .flip-box-front i {
        font-size: 1.5rem;
    }

    .categoria-hero .categoria-icon {
        font-size: 2rem;
    }

    footer {
        font-size: 0.8rem;
    }
}