Bootstrap 5 Bar Loading Animations and Progress

<section class="wdw-stage loaders">
  <div class="container" style="max-width:960px">
    <div class="text-center mb-4">
      <span class="wdw-eyebrow">Loaders</span>
      <h2 class="wdw-heading h3 mb-1">Bar loading animations</h2>
      <p class="wdw-muted mb-0">Pure CSS loaders in one accent, shown in context.</p>
    </div>
    <div class="row g-4">
      <div class="col-md-4">
        <div class="wdw-card p-4 h-100 demo d-flex flex-column align-items-center justify-content-between text-center gap-3">
          <div class="stage-box"><div class="pinwheel" aria-hidden="true"><i></i><i></i><i></i><i></i></div></div>
          <div><h3 class="h6 fw-bold mb-0">Pinwheel</h3><p class="wdw-muted small mb-0">Four bars chasing each other</p></div>
        </div>
      </div>
      <div class="col-md-4">
        <div class="wdw-card p-4 h-100 demo d-flex flex-column align-items-center justify-content-between text-center gap-3">
          <div class="stage-box"><div class="wave" aria-hidden="true"><i></i><i></i><i></i><i></i><i></i><i></i><i></i></div></div>
          <div><h3 class="h6 fw-bold mb-0">Bars wave</h3><p class="wdw-muted small mb-0">A staggered rise and fall</p></div>
        </div>
      </div>
      <div class="col-md-4">
        <div class="wdw-card p-4 h-100 demo d-flex flex-column align-items-stretch justify-content-between gap-3">
          <div class="stage-box w-100" aria-hidden="true">
            <div class="skeleton w-100">
              <div class="d-flex gap-3 align-items-center mb-3"><span class="sk sk-avatar"></span><div class="flex-grow-1"><span class="sk sk-line w-75 mb-2"></span><span class="sk sk-line w-50"></span></div></div>
              <span class="sk sk-block"></span>
            </div>
          </div>
          <div class="text-center"><h3 class="h6 fw-bold mb-0">Skeleton</h3><p class="wdw-muted small mb-0">Shimmer placeholder card</p></div>
        </div>
      </div>
      <div class="col-md-4">
        <div class="wdw-card p-4 h-100 demo d-flex flex-column align-items-center justify-content-center gap-3 text-center">
          <button type="button" class="btn btn-primary rounded-pill px-4" data-save>
            <span class="mini-bars" aria-hidden="true"><i></i><i></i><i></i></span>
            <span data-save-label>Save changes</span>
          </button>
          <p class="wdw-muted small mb-0">Button loading state</p>
        </div>
      </div>
      <div class="col-md-8">
        <div class="wdw-card p-4 h-100 demo d-flex flex-column flex-sm-row align-items-sm-center gap-3">
          <div class="flex-grow-1">
            <div class="d-flex justify-content-between small fw-semibold mb-2"><span data-load-label role="status" aria-live="polite">Ready to upload</span><span data-load-pct aria-hidden="true">0%</span></div>
            <div class="progress" style="height:.75rem" role="progressbar" aria-label="Upload progress" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"><div class="progress-bar rounded-pill" style="width:0"></div></div>
          </div>
          <button type="button" class="btn btn-primary rounded-pill px-4" data-load-start>Start upload</button>
        </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 */
.loaders { padding-block: 1.5rem; }
.loaders .demo { min-height: 190px; }
.stage-box { min-height: 112px; display: flex; align-items: center; justify-content: center; flex: 1; }
.pinwheel { position: relative; width: 96px; height: 96px; }
.pinwheel i { position: absolute; width: 62px; height: 17px; border-radius: 5px; background: var(--bs-primary); animation: wdw-chase 1.2s ease-in-out infinite; }
.pinwheel i:nth-child(1) { top: 0; left: 10px; }
.pinwheel i:nth-child(2) { top: 10px; right: 0; width: 17px; height: 62px; animation-delay: -.9s; }
.pinwheel i:nth-child(3) { bottom: 0; right: 10px; animation-delay: -.6s; }
.pinwheel i:nth-child(4) { bottom: 10px; left: 0; width: 17px; height: 62px; animation-delay: -.3s; }
.wave { height: 88px; display: flex; align-items: center; gap: 7px; }
.wave i { width: 10px; height: 100%; border-radius: 5px; background: var(--bs-primary); transform-origin: center; animation: wdw-wave 1.1s ease-in-out infinite; }
.wave i:nth-child(2) { animation-delay: .1s; } .wave i:nth-child(3) { animation-delay: .2s; } .wave i:nth-child(4) { animation-delay: .3s; }
.wave i:nth-child(5) { animation-delay: .4s; } .wave i:nth-child(6) { animation-delay: .5s; } .wave i:nth-child(7) { animation-delay: .6s; }
.skeleton { max-width: 14rem; }
.sk { display: block; border-radius: .5rem; background: linear-gradient(90deg, var(--bs-secondary-bg) 25%, var(--bs-tertiary-bg) 50%, var(--bs-secondary-bg) 75%); background-size: 200% 100%; animation: wdw-shimmer 1.4s linear infinite; }
.sk-avatar { width: 44px; height: 44px; border-radius: 50%; flex: none; }
.sk-line { height: 10px; }
.sk-block { height: 48px; }
.mini-bars { display: none; align-items: center; gap: 3px; height: 16px; }
.mini-bars i { width: 3px; height: 100%; border-radius: 2px; background: currentColor; animation: wdw-wave .9s ease-in-out infinite; }
.mini-bars i:nth-child(2) { animation-delay: .15s; } .mini-bars i:nth-child(3) { animation-delay: .3s; }
[data-save].is-loading .mini-bars { display: inline-flex; }
.progress-bar { transition: width .35s ease-out; }
@keyframes wdw-chase { 0% { opacity: 1; transform: scale(1); } 70%, 100% { opacity: .45; transform: scale(.88); } }
@keyframes wdw-wave { 0%, 100% { transform: scaleY(.3); opacity: .45; } 50% { transform: scaleY(1); opacity: 1; } }
@keyframes wdw-shimmer { to { background-position: -200% 0; } }
@media (prefers-reduced-motion: reduce) {
  .pinwheel i, .wave i, .sk, .mini-bars i { animation: none; }
  .pinwheel i:nth-child(1) { opacity: 1; } .pinwheel i:nth-child(2) { opacity: .8; } .pinwheel i:nth-child(3) { opacity: .65; } .pinwheel i:nth-child(4) { opacity: .5; }
  .wave i:nth-child(odd) { transform: scaleY(.55); } .wave i:nth-child(even) { transform: scaleY(.9); }
  .progress-bar { transition: none; }
}

(function () {
  function initUpload() {
    var btn = document.querySelector('[data-load-start]');
    if (!btn) return;
    var bar = document.querySelector('.progress-bar');
    var track = bar.parentElement;
    var pct = document.querySelector('[data-load-pct]');
    var label = document.querySelector('[data-load-label]');
    var timer = null;
    function set(v) {
      bar.style.width = v + '%';
      pct.textContent = v + '%';
      track.setAttribute('aria-valuenow', v);
    }
    btn.addEventListener('click', function () {
      if (timer) return;
      var v = 0;
      btn.disabled = true;
      bar.classList.remove('bg-success');
      bar.classList.add('progress-bar-striped', 'progress-bar-animated');
      label.textContent = 'Uploading...';
      set(0);
      timer = setInterval(function () {
        v = Math.min(100, v + 2 + Math.ceil(Math.random() * 5));
        set(v);
        if (v >= 100) {
          clearInterval(timer);
          timer = null;
          bar.classList.remove('progress-bar-striped', 'progress-bar-animated');
          bar.classList.add('bg-success');
          label.textContent = '✓ Upload complete';
          btn.disabled = false;
          btn.textContent = 'Upload again';
        }
      }, 160);
    });
  }
  function initSaveButton() {
    var btn = document.querySelector('[data-save]');
    if (!btn) return;
    var label = btn.querySelector('[data-save-label]');
    btn.addEventListener('click', function () {
      if (btn.classList.contains('is-loading')) return;
      btn.classList.add('is-loading');
      btn.setAttribute('aria-disabled', 'true');
      label.textContent = 'Saving...';
      setTimeout(function () {
        btn.classList.remove('is-loading');
        btn.removeAttribute('aria-disabled');
        label.textContent = 'Saved';
        setTimeout(function () { label.textContent = 'Save changes'; }, 1500);
      }, 1800);
    });
  }
  initUpload();
  initSaveButton();
})();