Bootstrap 5 Accordion with Highlighted Active Item

<section class="wdw-stage">
  <div class="container" style="max-width:720px">
    <div class="text-center mb-4 mb-md-5">
      <span class="wdw-eyebrow mb-2">Help centre</span>
      <h2 class="wdw-heading display-6 mb-0">Frequently asked questions</h2>
    </div>
    <div class="accordion hl-accordion" id="faqAccordion">
      <div class="accordion-item">
        <h3 class="accordion-header"><button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#faq1" aria-expanded="true" aria-controls="faq1">How do I get started?</button></h3>
        <div id="faq1" class="accordion-collapse collapse show" data-bs-parent="#faqAccordion"><div class="accordion-body">Create a free account, invite your team and import your first project. Setup takes about five minutes and needs no credit card.</div></div>
      </div>
      <div class="accordion-item">
        <h3 class="accordion-header"><button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#faq2" aria-expanded="false" aria-controls="faq2">Can I change my plan later?</button></h3>
        <div id="faq2" class="accordion-collapse collapse" data-bs-parent="#faqAccordion"><div class="accordion-body">Yes. Upgrade or downgrade at any time from billing settings, and we prorate the difference automatically.</div></div>
      </div>
      <div class="accordion-item">
        <h3 class="accordion-header"><button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#faq3" aria-expanded="false" aria-controls="faq3">Is my data secure?</button></h3>
        <div id="faq3" class="accordion-collapse collapse" data-bs-parent="#faqAccordion"><div class="accordion-body">Data is encrypted in transit and at rest, and we run daily backups that are kept for 30 days.</div></div>
      </div>
      <div class="accordion-item">
        <h3 class="accordion-header"><button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#faq4" aria-expanded="false" aria-controls="faq4">How do I contact support?</button></h3>
        <div id="faq4" class="accordion-collapse collapse" data-bs-parent="#faqAccordion"><div class="accordion-body">Use the chat bubble in the app or email the support team. We reply within one business day.</div></div>
      </div>
    </div>
  </div>
</section>

/* Web Designer Wall library style — shared base for every Bootstrap 5 snippet.
   Indigo accent, Plus Jakarta Sans, soft cards, pill buttons. Works in light and dark. */
@import url("https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap");

:root,
[data-bs-theme="light"] {
  --wdw-font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --bs-body-font-family: var(--wdw-font);
  --bs-primary: #4f46e5;
  --bs-primary-rgb: 79, 70, 229;
  --bs-primary-text-emphasis: #3730a3;
  --bs-primary-bg-subtle: #eef2ff;
  --bs-primary-border-subtle: #c7d2fe;
  --bs-link-color: #4f46e5;
  --bs-link-color-rgb: 79, 70, 229;
  --bs-link-hover-color: #4338ca;
  --bs-link-hover-color-rgb: 67, 56, 202;
  --bs-focus-ring-color: rgba(79, 70, 229, 0.25);
  --bs-border-radius: 0.75rem;
  --bs-border-radius-lg: 1rem;
  --bs-border-radius-xl: 1.25rem;
  --wdw-radius-card: 1.25rem;
  --wdw-shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 16px 40px -16px rgba(16, 24, 40, 0.22);
  --wdw-shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 12px -4px rgba(16, 24, 40, 0.12);
  --wdw-stage: #f5f6fb;
}

[data-bs-theme="dark"] {
  --bs-primary: #818cf8;
  --bs-primary-rgb: 129, 140, 248;
  --bs-primary-text-emphasis: #c7d2fe;
  --bs-primary-bg-subtle: rgba(129, 140, 248, 0.14);
  --bs-primary-border-subtle: rgba(129, 140, 248, 0.35);
  --bs-link-color: #a5b4fc;
  --bs-link-color-rgb: 165, 180, 252;
  --bs-link-hover-color: #c7d2fe;
  --bs-link-hover-color-rgb: 199, 210, 254;
  --bs-focus-ring-color: rgba(129, 140, 248, 0.35);
  --wdw-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -16px rgba(0, 0, 0, 0.7);
  --wdw-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 12px -4px rgba(0, 0, 0, 0.5);
  --wdw-stage: #0f1117;
}

body { font-family: var(--wdw-font); -webkit-font-smoothing: antialiased; }

/* Bootstrap compiles its blue into these components; point them at the accent. */
.btn-primary {
  --bs-btn-bg: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: #4338ca; --bs-btn-hover-border-color: #4338ca;
  --bs-btn-active-bg: #3730a3; --bs-btn-active-border-color: #3730a3;
  --bs-btn-disabled-bg: var(--bs-primary); --bs-btn-disabled-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
[data-bs-theme="dark"] .btn-primary { --bs-btn-color: #0f1117; --bs-btn-hover-bg: #a5b4fc; --bs-btn-hover-border-color: #a5b4fc; --bs-btn-hover-color: #0f1117; --bs-btn-active-color: #0f1117; }
.btn-outline-primary {
  --bs-btn-color: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: var(--bs-primary); --bs-btn-hover-border-color: var(--bs-primary);
  --bs-btn-active-bg: var(--bs-primary); --bs-btn-active-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
.btn { --bs-btn-font-weight: 600; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: .5rem; }
.btn-sm { min-height: 36px; }
.form-control, .form-select { min-height: 44px; border-radius: .75rem; }
.form-control:focus, .form-select:focus, .form-check-input:focus { border-color: rgba(var(--bs-primary-rgb), .6); box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.form-check-input:checked { background-color: var(--bs-primary); border-color: var(--bs-primary); }
.nav-pills { --bs-nav-pills-link-active-bg: var(--bs-primary); }
.nav { --bs-nav-link-color: var(--bs-secondary-color); --bs-nav-link-hover-color: var(--bs-emphasis-color); }
.pagination { --bs-pagination-active-bg: var(--bs-primary); --bs-pagination-active-border-color: var(--bs-primary); --bs-pagination-color: var(--bs-body-color); --bs-pagination-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.progress, .progress-stacked { --bs-progress-bar-bg: var(--bs-primary); }
.list-group { --bs-list-group-active-bg: var(--bs-primary); --bs-list-group-active-border-color: var(--bs-primary); }
.dropdown-menu { --bs-dropdown-link-active-bg: var(--bs-primary); border-radius: .875rem; box-shadow: var(--wdw-shadow-sm); }
.accordion { --bs-accordion-active-bg: var(--bs-primary-bg-subtle); --bs-accordion-active-color: var(--bs-primary-text-emphasis); --bs-accordion-btn-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.badge { font-weight: 600; }

/* Library building blocks — use these instead of re-inventing them per snippet. */
.wdw-stage { min-height: 100vh; display: flex; align-items: center; background: var(--wdw-stage); padding-block: 3rem; }
.wdw-card { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: var(--wdw-radius-card); box-shadow: var(--wdw-shadow); }
.wdw-card-sm { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: 1rem; box-shadow: var(--wdw-shadow-sm); }
.wdw-aurora { position: relative; color: #fff; background: radial-gradient(60% 55% at 100% 0, #818cf8 0, transparent 70%), radial-gradient(65% 60% at 0 100%, #ec4899 0, transparent 65%), #1e1b4b; }
.wdw-eyebrow { display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--bs-primary); }
.wdw-heading { font-weight: 800; letter-spacing: -.02em; color: var(--bs-emphasis-color); }
.wdw-muted { color: var(--bs-secondary-color); }
.wdw-icon { width: 2.75rem; height: 2.75rem; flex: none; display: inline-flex; align-items: center; justify-content: center; border-radius: .875rem; background: var(--bs-primary-bg-subtle); color: var(--bs-primary); }

/* Component */
.hl-accordion { --bs-accordion-border-width: 0; --bs-accordion-bg: transparent; --bs-accordion-btn-padding-y: 1.35rem; --bs-accordion-btn-padding-x: 1.5rem; --bs-accordion-body-padding-x: 1.5rem; --bs-accordion-body-padding-y: .25rem; display: grid; gap: .75rem; }
.hl-accordion .accordion-item { border-radius: 1.25rem; overflow: hidden; background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); box-shadow: var(--wdw-shadow-sm); transition: background-color .25s; }
.hl-accordion .accordion-item:has(.show) { background: var(--bs-primary-bg-subtle); border-color: var(--bs-primary-border-subtle); }
.hl-accordion .accordion-button { font-weight: 700; font-size: 1.15rem; gap: 1rem; justify-content: space-between; background: transparent; color: var(--bs-emphasis-color); box-shadow: none; transition: color .25s; }
.hl-accordion .accordion-button:not(.collapsed) { background: transparent; color: var(--bs-primary-text-emphasis); }
.hl-accordion .accordion-button::after {
  flex: none; margin-left: 0; width: 2.25rem; height: 2.25rem; border-radius: 50%;
  background-color: var(--bs-secondary-bg);
  background-image: linear-gradient(currentColor, currentColor), linear-gradient(currentColor, currentColor);
  background-size: .9rem 2px, 2px .9rem; background-position: center; background-repeat: no-repeat;
  color: var(--bs-body-color);
  transition: transform .3s ease, background-color .25s, color .25s, background-size .3s ease;
}
.hl-accordion .accordion-button:not(.collapsed)::after {
  transform: rotate(180deg); background-size: .9rem 2px, 2px 0; background-color: var(--bs-primary); color: #fff;
}
[data-bs-theme="dark"] .hl-accordion .accordion-button:not(.collapsed)::after { color: #0f1117; }
.hl-accordion .accordion-button:focus-visible { box-shadow: inset 0 0 0 .2rem var(--bs-focus-ring-color); }
.hl-accordion .accordion-body { color: var(--bs-secondary-color); line-height: 1.7; font-size: 1.02rem; padding-bottom: 1.5rem; }
@media (prefers-reduced-motion: reduce) { .hl-accordion *, .hl-accordion *::after { transition: none !important; } }

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