/* Components: nav pill, chips, arrow-links, numbered rows, glossary, msg card,
   sticky badge rail, custom scrollbar. */

.pi-nav { position: fixed; inset: 0 0 auto 0; z-index: 40; display: flex;
  flex-direction: column; align-items: center; padding-top: 2.2rem; pointer-events: none; }
.pi-nav__row { display: flex; align-items: center; gap: 5px; pointer-events: auto; }
html.js .pi-nav__row { opacity: 0; }
.pi-nav__logo { display: flex; align-items: center; justify-content: center;
  width: 45px; height: 45px; border-radius: 10px; background: var(--nav-fill-light);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: background 400ms var(--ease-hover), color 400ms var(--ease-hover); }
.pi-nav__logo img { width: 18px; height: 18px; object-fit: contain; }
.pi-nav__pill { height: 45px; padding-inline: 2.6rem; border-radius: 10px;
  background: var(--nav-fill-light); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  display: flex; align-items: center; transition: background 400ms var(--ease-hover), color 400ms var(--ease-hover); }
.pi-nav__links { display: flex; align-items: center; gap: 2.8rem; }
.pi-nav__links a { font-size: 1.4rem; letter-spacing: -0.01em; transition: color 300ms var(--ease-hover); }
.pi-nav__links a:hover { color: var(--blue); }
.pi-nav__sub { pointer-events: auto; margin-top: 1rem; height: 30px; width: 300px; max-width: 80vw;
  border-radius: 10px; background: var(--nav-fill-light); display: flex; align-items: center;
  justify-content: center; gap: 8px; font-size: 1.2rem; color: var(--muted-on-light);
  transition: background 400ms var(--ease-hover), color 400ms var(--ease-hover),
    opacity 300ms var(--ease-hover), transform 300ms var(--ease-hover); }
.pi-nav__sub:hover { color: var(--blue); }
html.js .pi-nav .pi-nav__sub.is-hidden { opacity: 0; transform: translateY(-6px); pointer-events: none; }
.pi-nav__arrow { color: var(--blue); font-size: 1.1em; }

html[data-nav-theme="dark"] .pi-nav__logo, html[data-nav-theme="dark"] .pi-nav__pill, html[data-nav-theme="dark"] .pi-nav__sub,
html[data-nav-theme="blue"] .pi-nav__logo, html[data-nav-theme="blue"] .pi-nav__pill, html[data-nav-theme="blue"] .pi-nav__sub {
  background: var(--nav-fill-dark); color: var(--off-white);
}
html[data-nav-theme="dark"] .pi-nav__logo img, html[data-nav-theme="blue"] .pi-nav__logo img { filter: invert(1) brightness(1.15); }

.pi-badge-rail { position: relative; }
.pi-badge-rail__inner { position: sticky; top: 0; height: 100vh; z-index: 30; pointer-events: none; }
.pi-badge { position: absolute; left: var(--gutter); top: 50%; transform: translateY(-50%);
  width: 56px; height: 32px; border-radius: 6px; background: var(--blue); color: var(--off-white);
  display: flex; align-items: center; justify-content: center; opacity: 1;
  transition: opacity 1000ms var(--ease-p2), background 400ms var(--ease-hover), color 400ms var(--ease-hover); }
html.js .pi-badge { opacity: 0; }
.pi-badge svg { width: 14px; height: 20px; }
html[data-badge="on"] .pi-badge { opacity: 1; }
html[data-badge-theme="light"] .pi-badge { color: var(--off-black); }
html[data-badge-theme="blue"] .pi-badge { background: var(--off-white); color: var(--blue); }

.pi-chip { display: inline-flex; align-items: center; border: 1px solid var(--blue);
  border-radius: 54px; padding: 2px 11px 4px; font-size: 1.6rem; color: var(--blue);
  transition: background 300ms var(--ease-hover), color 300ms var(--ease-hover); }
.pi-chip:hover { background: var(--blue); color: var(--off-white); }
.pi-chip:active { transform: scale(.98); }

.pi-arrowlink { display: inline-flex; align-items: baseline; gap: 8px; font-size: 1.4rem; color: var(--blue); }
:is(header, section)[data-theme="dark"] .pi-arrowlink, :is(header, section)[data-theme="blue"] .pi-arrowlink { color: var(--off-white); }
.pi-arrow-wrap { display: inline-block; width: 22px; height: 14px; overflow: hidden; position: relative; vertical-align: middle; }
.pi-arrow-a, .pi-arrow-b { position: absolute; inset: 0; display: flex; align-items: center;
  transition: transform 500ms var(--ease-expo); }
.pi-arrow-a { transform: translateX(0); }
.pi-arrow-b { transform: translateX(-25px); }
.pi-arrowlink:hover .pi-arrow-a, .pi-arrowlink.is-rolling .pi-arrow-a { transform: translateX(25px); }
.pi-arrowlink:hover .pi-arrow-b, .pi-arrowlink.is-rolling .pi-arrow-b { transform: translateX(0); }
.pi-arrowlink:active { transform: scale(.98); }

.pi-rows { border-top: .5px solid var(--hairline-on-dark); }
.pi-row { position: relative; padding-block: 3.2rem; align-items: baseline; }
.pi-row__label { grid-column: 2; font-size: 1.4rem; color: var(--muted-on-dark); }
.pi-row__num { color: var(--blue); margin-right: 6px; }
.pi-row__statement { grid-column: 3; font-size: clamp(2.2rem, 2.4vw, 2.7rem); line-height: 1.2;
  letter-spacing: -0.01em; font-weight: 300; margin: 0; }
.pi-row__line { position: absolute; left: 0; right: 0; bottom: 0; height: .5px; background: var(--hairline-on-dark); }

.pi-meta.pi-grid { grid-template-columns: repeat(3, 1fr); padding-block: 3.2rem; padding-left: 41.1%; column-gap: 2vw; }
.pi-meta__item { display: flex; flex-direction: column; gap: 1rem; }
.pi-meta__label { position: relative; padding-top: 14px; font-size: 1.3rem; color: var(--muted-on-dark); }
.pi-meta__label::before { content: ''; position: absolute; top: 0; left: 0; width: 18px; height: 1px; background: var(--blue); }
.pi-meta__value { font-size: 1.6rem; }

.pi-glossary.pi-grid { padding-block: 3.2rem; align-items: start; }
.pi-glossary__head { grid-column: 2; }
.pi-glossary__list { grid-column: 3 / -1; display: grid; grid-template-columns: repeat(3, 1fr); gap: 3vw; }
.pi-glossary__item { display: flex; flex-direction: column; gap: 1rem; }
.pi-glossary__term { color: var(--blue); font-size: 1.4rem; }
.pi-glossary__def { font-size: 1.5rem; color: var(--muted-on-dark); max-width: 26ch; }

.pi-msg { width: 420px; max-width: 88vw; border-radius: 16px; background: var(--off-white);
  border: 1px solid var(--hairline-on-light); box-shadow: 0 30px 80px rgba(15, 16, 18, .12);
  padding: 1.8rem 2rem 0; color: var(--off-black); }
.pi-msg__head { display: flex; align-items: center; gap: 10px; margin-bottom: 1.2rem; }
.pi-msg__avatar { width: 28px; height: 28px; border-radius: 6px; background: var(--off-black);
  color: var(--off-white); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.pi-msg__avatar svg { width: 11px; height: 15px; }
.pi-msg__name { font-size: 1.4rem; font-weight: 500; }
.pi-msg__time { margin-left: auto; font-size: 1.3rem; color: var(--muted-on-light); }
.pi-msg__body { font-size: 1.6rem; line-height: 1.35; letter-spacing: -0.01em; margin-bottom: 1.8rem; }
.pi-msg__input { border-top: 1px solid var(--hairline-on-light); padding: 1.4rem 0; font-size: 1.4rem;
  color: var(--muted-on-light); }

html.js .pi-sb { position: fixed; top: 8px; bottom: 8px; right: 5px; width: 2px; z-index: 50;
  opacity: 0; pointer-events: none; transition: opacity 300ms var(--ease-hover); }
html.js .pi-sb.is-scrolling { opacity: 1; }
.pi-sb__thumb { position: absolute; top: 0; width: 100%; height: 64px;
  background: rgba(120, 120, 120, .9); border-radius: 2px; }
html:not(.js) .pi-sb { display: none; }

@media (prefers-reduced-motion: reduce) {
  html.js .pi-nav__row { opacity: 1; }
  html.js .pi-badge { opacity: 1; }
}