/* Progressive enhancement: all principles remain readable without JavaScript. */
@media (max-width: 899px) {
  .principles-article { padding: 28px 12px 36px; }
  .principle-section {
    padding: 24px 20px;
    border: 1px solid #e0d4e9;
    border-radius: 22px;
    background: #fffdf9;
    box-shadow: 0 3px 0 #e6ddef;
    scroll-margin-top: 100px;
  }
  .principle-section + .principle-section { margin-top: 18px; padding-top: 24px; border-top: 1px solid #e0d4e9; }
  .principle-section.is-reading { border-color: #baa3ce; }
  .principle-title { scroll-margin-top: 110px; }
  .principle-number { display: inline-block; max-width: 100%; white-space: normal; vertical-align: top; }
  .reading-progress {
    position: sticky;
    top: max(10px, env(safe-area-inset-top));
    z-index: 15;
    padding: 4px 15px 12px;
    margin-bottom: 16px;
    border: 1px solid #e0d3ed;
    border-radius: 16px;
    background: #fffdf9f7;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
  .reading-progress-heading {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0 12px;
    margin-bottom: 3px;
    color: var(--ink);
    font-size: .8125rem;
    line-height: 1.4;
    font-weight: 600;
  }
  .reader-view-toggle {
    min-height: 44px;
    padding: 8px 0 8px 8px;
    background: none;
    color: #80668f;
    font-size: .75rem;
    font-weight: 450;
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-color: #c5b4d1;
  }
  .reading-progress-track { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 6px; }
  .reading-progress-step { height: 4px; border-radius: 99px; background: #eae1f0; }
  .reading-progress-step.is-complete { background: #c8ee8c; }
  .reading-progress-step.is-current { background: #694383; }
  .reader-nav-button svg { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
  .principles-article[data-reader-mode="carousel"] .reader-track {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    height: var(--reader-height, auto);
    transition: height 280ms cubic-bezier(.2, .7, .2, 1);
    margin-inline: -12px;
    padding: 0 12px 4px;
    overflow-x: auto;
    overflow-y: hidden;
    overscroll-behavior-x: contain;
    overflow-anchor: none;
    scroll-snap-type: x mandatory;
    scroll-padding-inline: 12px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .reader-track::-webkit-scrollbar { display: none; }
  .principles-article[data-reader-mode="carousel"] .principle-section {
    flex: 0 0 calc(100% - 16px);
    min-width: 0;
    margin: 0;
    scroll-snap-align: start;
    scroll-snap-stop: always;
  }
  .reader-controls {
    display: grid;
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.3fr);
    gap: 10px;
    margin-top: 18px;
  }
  .reader-nav-button {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 7px;
    min-height: 50px;
    padding: 11px 12px;
    border: 1px solid #d5c5e1;
    border-radius: 14px;
    font-size: .875rem;
    line-height: 1.3;
    font-weight: 650;
  }
  .reader-nav-button > span { min-width: 0; overflow-wrap: anywhere; }
  .reader-nav-button svg { width: 19px; height: 19px; flex: 0 0 19px; }
  .reader-prev { color: #604870; background: #fffdf9; }
  .reader-next { color: var(--ink); background: var(--lime); border-color: #b6dd7b; box-shadow: 0 3px 0 #a8c975; }
  .reader-nav-button:disabled { opacity: .38; }
  .reader-nav-button:not(:disabled):active { transform: translateY(1px); box-shadow: none; }
  .principles-article[data-reader-mode="list"] .reading-progress { margin-bottom: 18px; }
  .reader-announcement { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .call-section { padding-inline: 12px; }
}
@media (max-width: 359px) {
  .principles-article, .call-section { padding-inline: 10px; }
  .principle-section { padding-inline: 16px; }
  .principles-article[data-reader-mode="carousel"] .reader-track { margin-inline: -10px; padding-inline: 10px; scroll-padding-inline: 10px; }
  .reader-controls { gap: 8px; }
  .reader-nav-button { padding-inline: 8px; gap: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  .principles-article[data-reader-mode="carousel"] .reader-track { transition: none; }
}
@media print {
  .reading-progress, .reader-controls, .reader-announcement { display: none !important; }
  .principles-article[data-reader-mode="carousel"] .reader-track { display: contents !important; height: auto !important; overflow: visible !important; }
  .principles-article[data-reader-mode="carousel"] .principle-section { display: block !important; width: auto !important; margin-block: 20px !important; box-shadow: none; }
}