@media (max-width: 600px) {
  body {
    font-size: 16px;
    line-height: 1.6;
  }
  .wrap {
    padding: 0 24px;
  }
  .hero,
  .lead,
  .algos,
  .wrap > p {
    padding-left: 2px;
    padding-right: 2px;
  }
  .wrap > section {
    padding: 26px 0 6px;
  }
  p {
    margin: 0.8em 0;
  }
  h1 {
    font-size: 30px;
  }
  .sub {
    font-size: 15px;
  }
  h2.h {
    font-size: 21px;
    margin-bottom: 12px;
    gap: 10px;
  }
  .lead {
    font-size: 18px;
    line-height: 1.5;
    margin: 18px 0 4px;
  }
  .small,
  .note,
  .proof {
    font-size: 14px;
  }
  ul {
    padding-left: 22px;
  }
  header h1 {
    padding-right: 40px;
  }

  /* top nav collapses; the header hamburger opens a side drawer */
  .navtoggle {
    display: flex;
    align-items: center;
    justify-content: center;
    right: 18px;
  }
  header h1,
  header .sub {
    padding-right: 56px;
  }
  nav.tabs2 {
    position: static;
    background: transparent;
    border-bottom: none;
    height: 0;
    backdrop-filter: none;
  }
  nav.tabs2 .wrap {
    display: block;
    height: 0;
    min-height: 0;
    padding: 0;
    overflow: visible;
  }
  nav.tabs2 .navlinks {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: 80%;
    max-width: 320px;
    flex-direction: column;
    align-items: stretch;
    background: var(--ink);
    color: #f3f4f6;
    padding: 58px 0 0;
    transform: translateX(101%);
    transition: transform 0.3s ease;
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.3);
    z-index: 90;
  }
  body.nav-open nav.tabs2 .navlinks {
    transform: translateX(0);
  }
  nav.tabs2 .navlinks a {
    color: #e8eaee;
    border: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 16px 26px;
    margin: 0;
    background: transparent;
  }
  nav.tabs2 .navlinks a:first-child {
    padding-left: 26px;
    margin-left: 0;
  }
  nav.tabs2 .navlinks a:hover {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
  }
  nav.tabs2 .navlinks a.here {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    border-bottom-color: rgba(255, 255, 255, 0.08);
  }
  .navclose {
    display: block;
    position: absolute;
    top: 10px;
    right: 16px;
    all: unset;
    cursor: pointer;
    color: #f3f4f6;
    font-size: 30px;
    line-height: 1;
    padding: 4px 10px;
  }
  .navbackdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 85;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease;
  }
  body.nav-open .navbackdrop {
    opacity: 1;
    visibility: visible;
  }

  .twofig {
    gap: 10px;
    margin: 14px 0;
    flex-direction: column;
  }
  .twofig figure {
    flex: 1 1 0;
    min-width: 0;
    max-width: none;
    margin: 0;
    padding: 8px;
  }
  .twofig figcaption {
    font-size: 12.5px;
  }
  .nextlinks {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  table {
    font-size: 13px;
  }
  th,
  td {
    padding: 7px 8px;
  }
  footer {
    font-size: 13px;
  }

  /* model pipeline: a single row within the viewport */
  div.pipe {
    overflow-x: hidden;
    padding: 10px 8px;
  }
  .pipe .pipe-row {
    display: flex;
    width: 100%;
    gap: 3px;
  }
  .pipe .pipe-row .blk {
    flex: 1 1 0;
    min-width: 0;
    padding: 6px 3px;
    font-size: 9.5px;
  }
  .pipe .pipe-row .blk.frozen,
  .pipe .pipe-row .blk.train {
    width: auto;
  }
  .pipe .pipe-row .blk small {
    font-size: 7.5px;
  }
  .pipe .pipe-row .blk i {
    font-size: 7px;
    padding: 1px 4px;
  }
  .pipe .pipe-row .arr {
    flex: none;
    align-self: center;
    font-size: 10px;
  }

  /* roster: data columns stay visible, the descriptive column scrolls */
  .tablewrap .rostertbl {
    font-size: 12px;
  }
  .tablewrap .rostertbl th,
  .tablewrap .rostertbl td {
    padding-right: 10px;
  }
  .rostertbl td.bias {
    white-space: nowrap;
  }

  /* results tables: the metric columns fit the viewport */
  .tbl-wrap .rtable {
    font-size: 12px;
  }
  .tbl-wrap .rtable th,
  .tbl-wrap .rtable td {
    padding-left: 7px;
    padding-right: 7px;
  }

  /* dataset sample portraits fit within the card */
  .dcard .dc-faces {
    gap: 6px;
  }
  .dcard .dc-faces img {
    width: 68px;
    height: 61px;
  }

  /* nav cards: the arrow sits at the trailing edge */
  .navcard .nl-t {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 10px;
  }

  /* subnav count chip flows inline with the tabs */
  .subnav .chip {
    margin-left: 0;
  }
}

@media (max-width: 430px) {
  body {
    font-size: 15.5px;
    line-height: 1.58;
  }
  .wrap {
    padding: 0 20px;
  }
  .wrap > section {
    padding: 24px 0 6px;
  }
  h1 {
    font-size: 26px;
  }
  h2.h {
    font-size: 19px;
  }
  .lead {
    font-size: 17px;
  }
  .author {
    gap: 10px;
  }
  .author img {
    width: 48px;
    height: 48px;
  }
}

/* tablet: the model pipeline flexes to fill the row */
@media (min-width: 601px) and (max-width: 800px) {
  .pipe {
    overflow-x: hidden;
  }
  .pipe .pipe-row {
    display: flex;
    width: 100%;
    gap: 5px;
  }
  .pipe .pipe-row .blk {
    flex: 1 1 0;
    min-width: 0;
  }
  .pipe .pipe-row .blk.frozen,
  .pipe .pipe-row .blk.train {
    width: auto;
  }
}

/* protocol flow: a single row that scales down to the viewport */
@media (max-width: 720px) {
  .protoflow .pf-row {
    flex-direction: row;
  }
  .protoflow .pf-arr {
    transform: none;
  }
  .protoflow .pf-step {
    padding: 8px 5px;
  }
  .protoflow .pf-t {
    font-size: clamp(10px, 2.6vw, 13px);
  }
  .protoflow .pf-d {
    font-size: clamp(8px, 2vw, 11.5px);
  }
  .protoflow .pf-ico {
    width: clamp(28px, 5vw, 40px);
    height: auto;
  }
}