/* ==========================================================================
   Responsive Core — Padrão Global Sttec HUB
   ==========================================================================
   Este arquivo define o sistema unificado de responsividade replicado em toda a estrutura do STTEC HUB.
   Breakpoints-base:
     --hub-bp-mobile:  480px
     --hub-bp-tablet:  640px
     --hub-bp-desktop: 968px
     --hub-bp-xl:     1440px
   Regras:
     - Mobile-first: base = 1 coluna / empilhado
     - a partir de 640px: 2 colunas onde couber
     - a partir de 968px: layout desktop completo
     - grids genéricos usam auto-fit/minmax para evitar media queries repetitivas
   */

:root {
    --hub-bp-mobile:  480px;
    --hub-bp-tablet:  640px;
    --hub-bp-desktop: 968px;
    --hub-bp-xl:     1440px;

    --hub-space-xs: 0.5rem;   /* 8px */
    --hub-space-sm: 0.75rem;  /* 12px */
    --hub-space-md: 1rem;     /* 16px */
    --hub-space-lg: 1.5rem;   /* 24px */
    --hub-space-xl: 2rem;     /* 32px */
    --hub-space-2xl: 3rem;    /* 48px */

    --hub-radius-sm: 8px;
    --hub-radius-md: 12px;
    --hub-radius-lg: 16px;
    --hub-radius-xl: 24px;

    --hub-container: 1280px;
}

/* ==========================================================================
   Utilities de layout
   ========================================================================== */
.hub-container {
    width: 100%;
    max-width: var(--hub-container);
    margin-inline: auto;
    padding-inline: var(--hub-space-lg);
}

.hub-grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--hub-space-lg);
}
@media (min-width: var(--hub-bp-tablet)) {
    .hub-grid-2 { grid-template-columns: repeat(2, 1fr); }
}

.hub-grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--hub-space-lg);
}
@media (min-width: var(--hub-bp-tablet)) {
    .hub-grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: var(--hub-bp-desktop)) {
    .hub-grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.hub-grid-4 {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--hub-space-lg);
}
@media (min-width: var(--hub-bp-tablet)) {
    .hub-grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: var(--hub-bp-desktop)) {
    .hub-grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.hub-grid-auto {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--hub-space-lg);
}

.hub-stack-mobile {
    display: flex;
    flex-direction: column;
    gap: var(--hub-space-md);
}
@media (min-width: var(--hub-bp-desktop)) {
    .hub-stack-mobile {
        flex-direction: row;
        align-items: center;
    }
}

.hub-section {
    padding-block: var(--hub-space-2xl);
    padding-inline: var(--hub-space-lg);
}
@media (min-width: var(--hub-bp-xl)) {
    .hub-section { padding-inline: 0; }
}

/* Evita overflow em containers com imagens/cards que estouram */
.hub-min-0 { min-height: 0; min-width: 0; }

/* Imagens com proporção controlada */
.hub-aspect-16x9 { aspect-ratio: 16 / 9; }
.hub-aspect-4x3  { aspect-ratio: 4 / 3; }
.hub-aspect-1x1  { aspect-ratio: 1 / 1; }

.hub-img-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Tipografia fluida */
.hub-text-display {
    font-size: clamp(2rem, 1.5rem + 2vw, 3.5rem);
    line-height: 1.15;
    letter-spacing: -0.02em;
}
.hub-text-title {
    font-size: clamp(1.5rem, 1rem + 1.5vw, 2.5rem);
    line-height: 1.2;
    letter-spacing: -0.01em;
}
.hub-text-body {
    font-size: clamp(0.875rem, 0.75rem + 0.5vw, 1rem);
    line-height: 1.6;
}

/* Acessibilidade: skip link */
.hub-skip-link {
    position: absolute;
    left: -9999px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}
.hub-skip-link:focus {
    position: fixed;
    left: 1rem;
    top: 1rem;
    width: auto;
    height: auto;
    padding: 1rem;
    background: #000;
    color: #fff;
    z-index: 9999;
    border-radius: 8px;
}