.section--sources { --field: var(--field-reference); padding-block: clamp(72px, 10vh, 120px) clamp(120px, 17vh, 180px); }
.reference > .headline { font-size: clamp(42px, 4.6vw, 72px); margin-bottom: 38px; }
.reference__return { position: fixed; z-index: 70; top: max(20px, env(safe-area-inset-top)); right: max(20px, env(safe-area-inset-right)); --bg: var(--ink); --fg: var(--white); box-shadow: 0 0 0 1px rgb(255 255 255 / 0.16), 0 8px 28px rgb(13 15 28 / 0.22); }
.reference__return[hidden] { display: none; }
.reference__drawer { border-top: 2px solid var(--ink); border-bottom: 1px solid color-mix(in oklab, var(--ink) 20%, transparent); }
.reference__summary { display: flex; align-items: center; justify-content: space-between; gap: 30px; min-height: 116px; padding: 24px 4px; list-style: none; cursor: pointer; font-size: clamp(24px, 2.5vw, 36px); font-weight: 700; letter-spacing: -0.035em; line-height: 1.2; touch-action: manipulation; -webkit-tap-highlight-color: transparent; }
.reference__summary::-webkit-details-marker { display: none; }
.reference__summary::marker { content: ''; }
.reference__summary-sub { display: block; margin-top: 9px; color: var(--ink-3); font-size: var(--t-label); font-weight: 550; letter-spacing: -0.01em; }
.reference__summary-action { display: flex; align-items: center; gap: 22px; color: var(--ink-2); font-size: var(--t-label); font-weight: 650; letter-spacing: -0.01em; }
.reference__plus { display: block; position: relative; width: 48px; height: 48px; border-radius: 50%; background: var(--ink); color: var(--paper); transition: transform 450ms var(--ease-spring); }
.reference__plus::before, .reference__plus::after { content: ''; position: absolute; top: calc(50% - 1px); left: 15px; width: 18px; height: 2px; background: currentColor; }
.reference__plus::after { rotate: 90deg; transition: rotate 400ms var(--ease-spring); }
.reference__summary:hover .reference__plus { transform: scale(1.08); }
.reference__summary:active .reference__plus { transform: scale(0.94); }
.reference__open { display: none; }
.reference__drawer[open] .reference__closed { display: none; }
.reference__drawer[open] .reference__open { display: inline; }
.reference__drawer[open] .reference__plus::after { rotate: 0deg; }
.reference__body { padding: 18px 4px 50px; }
.reference__verified { margin: 0 0 42px; font-size: clamp(23px, 2.2vw, 32px); font-weight: 700; letter-spacing: -0.03em; }
.reference__verified span { color: var(--ink-3); font-size: var(--t-label); font-weight: 550; letter-spacing: 0; }
.reference__block { margin-top: 60px; max-width: 1080px; }
.reference__block h3 { margin: 0 0 24px; font-size: clamp(26px, 2.7vw, 38px); font-weight: 750; letter-spacing: -0.035em; line-height: 1.1; }
.reference__block h4 { margin: 0 0 9px; font-size: 19px; font-weight: 700; letter-spacing: -0.018em; }
.reference__block p, .reference__block li, .reference__block dd { font-size: 15px; line-height: 1.6; }
.reference__legend { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 38px; margin: 0; }
.reference__legend > div { display: grid; grid-template-columns: 110px 1fr; align-items: start; gap: 16px; }
.reference__legend dt { padding-top: 2px; }
.reference__legend dd { margin: 0; color: var(--ink-2); }
.reference__legend .badge, .reference__spec { font-size: 13px; }
.reference__spec { display: inline-block; padding: 3px 9px; font-weight: 700; border-radius: 999px; background: rgb(13 15 28 / 0.07); }
.reference__notes { padding-left: 22px; margin: 0; color: var(--ink-2); }
.reference__notes li { padding-left: 5px; margin-bottom: 14px; }
.reference__method { margin-top: 32px; padding-left: 22px; border-left: 2px solid rgb(13 15 28 / 0.16); }
.reference__method p { margin: 9px 0; color: var(--ink-2); }
.reference__sources { margin: 0; padding-left: 42px; }
.reference__source { position: relative; padding: 24px 20px 24px 12px; margin-bottom: 2px; border-bottom: 1px solid var(--line); border-radius: 8px; scroll-margin-top: 88px; overflow-wrap: anywhere; transform: translateX(calc(var(--ref-pulse, 0) * 8px)); }
.reference__source::marker { color: var(--ink-3); font-size: 15px; font-weight: 700; font-variant-numeric: tabular-nums; }
.reference__source.is-highlighted { background: #ffe991; }
.reference__source:focus-visible { outline-offset: 2px; }
.reference__source-meta { margin: 0 0 8px; color: var(--ink-3); font-size: 13px !important; }
.reference__url { color: var(--r1s-ink); text-underline-offset: 3px; font-size: 14px; }
.reference__source-note { margin: 10px 0 0; color: var(--ink-2); }
.reference__gaps { margin: 0; }
.reference__gaps > div { padding-block: 22px; border-top: 1px solid var(--line); }
.reference__gaps dt { margin-bottom: 7px; font-size: 17px; font-weight: 700; letter-spacing: -0.015em; }
.reference__gaps dd { margin: 0; color: var(--ink-2); }
.reference__rights p { color: var(--ink-2); max-width: 70em; }
.reference__download { display: inline-flex; align-items: center; gap: 22px; min-height: 48px; margin-top: 16px; font-size: 15px; font-weight: 650; text-decoration-thickness: 1px; text-underline-offset: 5px; }
@media (max-width: 1000px) {
  .reference__legend { gap: 24px; }
  .reference__legend > div { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 700px) {
  .reference__summary { gap: 16px; }
  .reference__summary-action > span:not(.reference__plus) { display: none; }
  .reference__plus { width: 44px; height: 44px; }
  .reference__plus::before, .reference__plus::after { left: 13px; }
  .reference__legend { grid-template-columns: 1fr; }
  .reference__legend > div { grid-template-columns: 110px 1fr; }
  .reference__source { padding-inline: 6px; }
  .reference__sources { padding-left: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  .reference__source { transform: none; }
  .reference__plus, .reference__plus::after { transition: none; }
}