/* =========================================================
   STACK — js/stack.js
   Esquerda: quatro grupos de tecnologias (botões). Direita: onde a
   tecnologia escolhida aparece no site; fica parada ao rolar.
   ========================================================= */

.stk-app { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr); gap: 1.5rem; align-items: start; }
.stk-grupos { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.stk-grupo, .stk-onde {
  padding: 1.4rem; border-radius: 1.5rem;
  background: var(--glass-tint); border: 1px solid var(--glass-line); box-shadow: var(--glass-shine), var(--glass-shadow);
  -webkit-backdrop-filter: blur(26px) saturate(170%); backdrop-filter: blur(26px) saturate(170%);
}
html.perf-low .stk-grupo, html.perf-low .stk-onde { -webkit-backdrop-filter: none; backdrop-filter: none; background: var(--glass-solid); }

.stk-g-infra { --stk-tom: var(--accent); }
.stk-g-redes { --stk-tom: #5fe0d8; }
.stk-g-dev { --stk-tom: #a9b8ff; }
.stk-g-web { --stk-tom: #f0a6c8; }
body.light-theme .stk-g-redes { --stk-tom: #0f7f8a; }
body.light-theme .stk-g-dev { --stk-tom: #4a5bc4; }
body.light-theme .stk-g-web { --stk-tom: #a8336a; }

.stk-grupo h3 { display: flex; align-items: center; gap: .55rem; margin-bottom: 1rem; font-size: 1.05rem; font-weight: 600; letter-spacing: -.02em; }
.stk-grupo h3::before { content: ''; width: .55rem; height: .55rem; border-radius: 50%; background: var(--stk-tom); box-shadow: 0 0 0 4px color-mix(in srgb, var(--stk-tom) 20%, transparent); }
.stk-chips { display: flex; flex-wrap: wrap; gap: .45rem; }
.stk-chip {
  display: inline-flex; align-items: center; gap: .5rem; padding: .42rem .5rem .42rem .85rem; border-radius: 980px; cursor: pointer;
  font: inherit; font-size: .88rem; letter-spacing: -.01em; color: var(--cream);
  background: color-mix(in srgb, var(--gray) 12%, transparent); border: 1px solid transparent;
  transition: background-color .15s ease, border-color .15s ease, transform .16s var(--ease-out);
}
.stk-chip span { min-width: 1.35rem; padding: .05rem .35rem; border-radius: 980px; font-size: .72rem; font-weight: 600; text-align: center; font-variant-numeric: tabular-nums; color: var(--gray); background: color-mix(in srgb, var(--gray) 16%, transparent); }
.stk-chip[aria-pressed="true"] { background: color-mix(in srgb, var(--stk-tom) 18%, transparent); border-color: color-mix(in srgb, var(--stk-tom) 55%, transparent); }
.stk-chip[aria-pressed="true"] span { color: var(--dark); background: var(--stk-tom); }
.stk-chip:active { transform: scale(.97); }
.stk-chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (hover: hover) and (pointer: fine) { .stk-chip:hover { border-color: color-mix(in srgb, var(--stk-tom) 40%, transparent); } }

.stk-onde { position: sticky; top: 6rem; }
.stk-onde-topo span { display: inline-flex; align-items: center; gap: .45rem; font-size: .78rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--gray); }
.stk-onde-topo span::before { content: ''; width: .5rem; height: .5rem; border-radius: 50%; background: var(--stk-tom); }
.stk-onde h3 { margin: .5rem 0 1.1rem; font-size: clamp(1.35rem, 2.2vw, 1.7rem); font-weight: 500; line-height: 1.2; letter-spacing: -.03em; color: var(--gray); }
.stk-onde h3 b { font-weight: 600; color: var(--cream); }
.stk-onde ul { list-style: none; display: grid; gap: .35rem; }
.stk-onde a {
  display: grid; grid-template-columns: 6.2rem minmax(0, 1fr) auto; align-items: center; gap: .75rem; padding: .7rem .85rem; border-radius: .95rem;
  color: var(--cream); text-decoration: none; background: color-mix(in srgb, var(--gray) 8%, transparent); transition: background-color .15s ease;
}
.stk-onde a:hover, .stk-onde a:focus-visible { background: color-mix(in srgb, var(--stk-tom) 14%, transparent); }
.stk-onde a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.stk-onde em { font-style: normal; font-size: .74rem; font-weight: 600; letter-spacing: .03em; color: var(--stk-tom); }
.stk-onde a span { font-size: .95rem; letter-spacing: -.01em; }
.stk-onde i { font-style: normal; color: var(--gray); transition: transform .2s var(--ease-out); }
@media (hover: hover) and (pointer: fine) { .stk-onde a:hover i { transform: translateX(3px); color: var(--cream); } }
.stk-onde li { animation: stk-entra .28s var(--ease-out) both; }
.stk-onde li:nth-child(2) { animation-delay: 30ms; } .stk-onde li:nth-child(3) { animation-delay: 60ms; } .stk-onde li:nth-child(4) { animation-delay: 90ms; }
.stk-onde li:nth-child(5) { animation-delay: 120ms; } .stk-onde li:nth-child(n+6) { animation-delay: 150ms; }
@keyframes stk-entra { from { opacity: 0; transform: translateY(5px); } }
.stk-nota { margin-top: 1rem; font-size: .8rem; color: var(--gray); }
@media (prefers-reduced-motion: reduce) { .stk-onde li { animation: none; } .stk-chip { transition: none; } }

@media (max-width: 1000px) { .stk-app { grid-template-columns: 1fr; } .stk-onde { position: static; } }
@media (max-width: 640px) {
  .stk-grupos { grid-template-columns: 1fr; }
  .stk-grupo, .stk-onde { padding: 1.15rem; border-radius: 1.25rem; -webkit-backdrop-filter: none; backdrop-filter: none; background: var(--glass-solid); }
  .stk-onde a { grid-template-columns: minmax(0, 1fr) auto; row-gap: .1rem; }
  .stk-onde em { grid-column: 1 / -1; }
}