:root {
    /* Breakpoints */
    --breakpoint-xs: 320px;
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
    --breakpoint-xxl: 1400px;

    /* Espaciado */
    --spacing-unit: 8px;
    --spacing-xs: calc(var(--spacing-unit) * 1);
    --spacing-sm: calc(var(--spacing-unit) * 2);
    --spacing-md: calc(var(--spacing-unit) * 3);
    --spacing-lg: calc(var(--spacing-unit) * 4);
    --spacing-xl: calc(var(--spacing-unit) * 5);

    /* Contenedor */
    --container-padding: var(--spacing-md);
    --container-max-width: 1200px;
}

/* Contenedor Fluido */
.container {
    width: 100%;
    padding-right: var(--container-padding);
    padding-left: var(--container-padding);
    margin-right: auto;
    margin-left: auto;
    max-width: var(--container-max-width);
}

/* Grid Autoajustable */
.grid {
    display: grid;
    gap: var(--spacing-md);
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

/* Grid con columnas específicas */
.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 400px), 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 250px), 1fr));
}

/* Media Queries con Variables */
@media (min-width: var(--breakpoint-sm)) {
    :root {
        --container-padding: var(--spacing-lg);
    }
}

@media (min-width: var(--breakpoint-md)) {
    :root {
        --container-padding: var(--spacing-xl);
    }
}

/* Utilidades Responsive */
.hide-xs {
    display: none;
}

@media (min-width: var(--breakpoint-sm)) {
    .hide-sm {
        display: none;
    }
    .show-sm {
        display: block;
    }
}

@media (min-width: var(--breakpoint-md)) {
    .hide-md {
        display: none;
    }
    .show-md {
        display: block;
    }
}

/* Flexbox Responsive */
.flex {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.flex-col {
    flex-direction: column;
}

@media (min-width: var(--breakpoint-md)) {
    .flex-row-md {
        flex-direction: row;
    }
}

/* Imágenes Responsive */
.img-fluid {
    max-width: 100%;
    height: auto;
}

/* Texto Responsive */
.text-responsive {
    font-size: clamp(1rem, 2.5vw, 1.5rem);
    line-height: 1.5;
}

/* Espaciado Responsive */
.mt-responsive {
    margin-top: clamp(var(--spacing-sm), 3vw, var(--spacing-lg));
}

.mb-responsive {
    margin-bottom: clamp(var(--spacing-sm), 3vw, var(--spacing-lg));
}

/* Aspect Ratio Responsive */
.aspect-ratio {
    position: relative;
    width: 100%;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
}

.aspect-ratio > * {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Cards Responsive */
.card {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--spacing-md);
    border-radius: 8px;
    background: var(--white);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.card-content {
    flex: 1;
}

/* Navegación Responsive */
.nav-responsive {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

@media (min-width: var(--breakpoint-md)) {
    .nav-responsive {
        flex-direction: row;
        align-items: center;
    }
}

/* Formularios Responsive */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid #ddd;
    border-radius: 4px;
}

@media (min-width: var(--breakpoint-md)) {
    .form-inline {
        display: flex;
        gap: var(--spacing-md);
    }
    
    .form-inline .form-group {
        flex: 1;
        margin-bottom: 0;
    }
}