/* Loader de página */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--degradado-fondo);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
    color: var(--color-terciario);
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid var(--color-terciario);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.loader-content p {
    font-family: 'Ubuntu', sans-serif;
    font-size: 1.1rem;
    letter-spacing: 0.5px;
}

/* Animaciones generales */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Animaciones específicas para elementos */
.skills__box {
    transition: all 0.3s ease;
}

.skills__box.animate-in {
    animation: slideInUp 0.6s ease forwards;
}

.academic__courses__box.animate-in {
    animation: fadeInScale 0.8s ease forwards;
}

.card.animate-in {
    animation: slideInRight 0.7s ease forwards;
}

/* Keyframes */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Botón con efecto loading */
.btn-loading {
    position: relative;
    overflow: hidden;
}

.btn-loading::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s ease;
}

.btn-loading:hover::before {
    left: 100%;
}

/* Efecto de typing para el título principal */
.typing-effect {
    overflow: hidden;
    border-right: 3px solid var(--color-terciario);
    white-space: nowrap;
    margin: 0 auto;
    letter-spacing: 0.1em;
    animation: typing 3.5s steps(30, end), blink-caret 0.75s step-end infinite;
}

@keyframes typing {
    from { width: 0 }
    to { width: 100% }
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: var(--color-terciario) }
}

/* Hover effects mejorados */
.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

/* Gradiente animado en botones */
.btn-gradient {
    background: linear-gradient(45deg, #008CBA, var(--color-primario));
    background-size: 200% 200%;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Pulse animation para elementos importantes */
.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

/* Smooth scroll behavior */
html {
    scroll-behavior: smooth;
}

/* Mejoras en las transiciones existentes */
* {
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Loading spinner */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--color-primario);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}