:root {
  --tds-navy-950: #050b14;
  --tds-navy-900: #0a1628;
  --tds-navy-850: #0d1d33;
  --tds-navy-800: #12233d;
  --tds-navy-700: #1d3557;
  --tds-blue: #35a9f4;
  --tds-blue-soft: #8dcbf4;
  --tds-orange: #ff8b2c;
  --tds-ink: #132039;
  --tds-muted: #5b6677;
  --tds-line: #dce3eb;
  --tds-paper: #fafaf8;
  --tds-white: #ffffff;
  --tds-max: 1180px;
  --tds-font: "Nunito Sans", Nunito, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.tds-v2-document,
body.tds-v2-shelf { margin: 0; background: var(--tds-paper); color: var(--tds-ink); font-family: var(--tds-font); font-size: 18px; line-height: 1.6; }
body.tds-v2-document { --tds-series-accent: var(--tds-blue); --tds-series-wash: rgba(53,169,244,.09); }
body.tds-series-engagement { --tds-series-accent: var(--tds-orange); --tds-series-wash: rgba(255,139,44,.09); }
body.tds-series-decision-science { --tds-series-accent: #59b7ef; --tds-series-wash: rgba(53,169,244,.09); }
body.tds-series-architecture { --tds-series-accent: #6eb8ff; --tds-series-wash: rgba(46,93,154,.10); }
body.tds-series-marketing-how-to-guides { --tds-series-accent: var(--tds-orange); --tds-series-wash: rgba(255,139,44,.10); }
.tds-v2-shell { min-height: 100vh; background: var(--tds-navy-900); color: var(--tds-white); font-family: var(--tds-font); font-size: 18px; line-height: 1.6; }
.tds-v2-shell *,
body.tds-v2-document *,
body.tds-v2-shelf * { box-sizing: border-box; }
.tds-v2-shell a,
body.tds-v2-document a,
body.tds-v2-shelf a { color: inherit; }
.tds-skip { position: fixed; left: 16px; top: -80px; z-index: 99999; padding: 10px 16px; background: var(--tds-orange); color: #08111f !important; border-radius: 4px; font: 600 16px/1.5 var(--tds-font); }
.tds-skip:focus { top: 16px; }
.tds-screen-reader-text { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0,0,0,0) !important; white-space: nowrap !important; border: 0 !important; }
.tds-reading-progress { position: fixed; inset: 0 0 auto; z-index: 99998; height: 3px; pointer-events: none; background: rgba(255,255,255,.05); }
.tds-reading-progress span { display: block; width: 100%; height: 100%; transform: scaleX(0); transform-origin: left center; background: linear-gradient(90deg, var(--tds-blue), var(--tds-orange)); box-shadow: 0 0 16px rgba(53,169,244,.55); }
.admin-bar .tds-reading-progress { top: 32px; }

.tds-sitebar { min-height: 72px; padding: 0 max(28px, calc((100vw - var(--tds-max)) / 2)); display: flex; align-items: center; justify-content: space-between; gap: 24px; background: var(--tds-navy-950); color: var(--tds-white); border-bottom: 1px solid rgba(255,255,255,.09); }
.tds-wordmark { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; text-transform: uppercase; letter-spacing: .12em; font: 700 13px/1.2 var(--tds-font); }
.tds-wordmark span { width: 9px; height: 9px; border-radius: 50%; background: var(--tds-orange); box-shadow: 0 0 0 5px rgba(255,139,44,.08); }
.tds-sitebar nav { display: flex; align-items: center; gap: 28px; }
.tds-sitebar nav a { color: #d9e4f0; text-decoration: none; text-transform: uppercase; letter-spacing: .1em; font: 600 12px/1.2 var(--tds-font); }
.tds-sitebar nav a:hover,
.tds-sitebar nav a:focus-visible,
.tds-sitebar nav a[aria-current="page"] { color: var(--tds-blue-soft); }

.tds-eyebrow { margin: 0 0 18px; color: var(--tds-orange); text-transform: uppercase; letter-spacing: .12em; font: 600 13px/1.4 var(--tds-font); }
.tds-library-page { width: min(var(--tds-max), calc(100% - 56px)); margin: 0 auto; padding: 104px 0 128px; }
.tds-library-intro { max-width: 800px; margin-bottom: 72px; }
.tds-library-intro h1,
.tds-document-hero h1,
.tds-shelf-intro h1 { margin: 0; font: 700 clamp(44px, 6vw, 64px)/1.05 var(--tds-font); letter-spacing: -.035em; }
.tds-library-intro h1,
.tds-document-hero h1 { color: var(--tds-white) !important; }
.tds-shelf-intro h1 { color: var(--tds-ink) !important; }
.tds-library-intro > p:last-child { max-width: 68ch; margin: 28px 0 0; color: #c7d4e4; font: 400 21px/1.6 var(--tds-font); }
.tds-library-search { margin: -18px 0 50px; padding: 24px 26px; display: grid; grid-template-columns: minmax(220px,.72fr) minmax(320px,1.28fr); gap: 9px 34px; align-items: end; border: 1px solid rgba(164,190,220,.24); border-radius: 10px; background: rgba(9,25,44,.72); }
.tds-library-search label { display: block; color: var(--tds-white); font: 600 20px/1.3 var(--tds-font); }
.tds-library-search div > p { margin: 8px 0 0; color: #9eb1c8; font: 400 15px/1.5 var(--tds-font); }
.tds-search-control { position: relative; }
.tds-search-control input { width: 100%; min-height: 52px; padding: 12px 72px 12px 16px; border: 1px solid rgba(141,203,244,.38); border-radius: 7px; outline: none; background: #0c1d34; color: var(--tds-white); font: 400 17px/1.4 var(--tds-font); }
.tds-search-control input::placeholder { color: #728ba7; opacity: 1; }
.tds-search-control input:focus { border-color: var(--tds-blue-soft); box-shadow: 0 0 0 3px rgba(53,169,244,.14); }
.tds-search-control button { position: absolute; right: 8px; top: 50%; transform: translateY(-50%); padding: 8px 9px; border: 0; background: transparent; color: var(--tds-blue-soft); text-decoration: underline; text-underline-offset: 3px; font: 600 12px/1.2 var(--tds-font); cursor: pointer; }
.tds-search-status { grid-column: 2; margin: 0; color: #8fa7c1; font: 400 13px/1.4 var(--tds-font); }
.tds-search-empty { grid-column: 1 / -1; margin: 12px 0 0; padding: 14px 16px; border-left: 3px solid var(--tds-orange); background: rgba(255,139,44,.06); color: #d9e4f0; font: 400 15px/1.5 var(--tds-font); }
.tds-library-groups { display: grid; gap: 18px; }
.tds-library-group { border: 1px solid rgba(164,190,220,.24); border-radius: 10px; background: rgba(9,25,44,.72); overflow: clip; }
.tds-library-group summary { min-height: 132px; padding: 28px 32px; display: flex; align-items: center; justify-content: space-between; gap: 32px; cursor: pointer; list-style: none; }
.tds-library-group summary::-webkit-details-marker { display: none; }
.tds-library-group summary:hover { background: rgba(39,70,108,.22); }
.tds-group-copy { display: grid; max-width: 850px; }
.tds-group-copy .tds-eyebrow { margin-bottom: 6px; }
.tds-group-copy > strong { color: var(--tds-white); font: 600 26px/1.25 var(--tds-font); }
.tds-group-copy > span:last-child { margin-top: 8px; color: #b8c7d9; font: 400 18px/1.6 var(--tds-font); }
.tds-group-toggle { flex: 0 0 42px; height: 42px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.24); border-radius: 50%; color: var(--tds-blue-soft); font: 400 26px/1 var(--tds-font); transition: transform .2s ease, background .2s ease; }
.tds-library-group[open] .tds-group-toggle { transform: rotate(45deg); background: rgba(53,169,244,.1); }
.tds-group-open { padding: 18px 32px 36px; display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(330px, .88fr); gap: 42px; border-top: 1px solid rgba(164,190,220,.2); }
.tds-resource-list { min-width: 0; }
.tds-resource-link { position: relative; display: grid; grid-template-columns: 38px minmax(0,1fr) 28px; gap: 14px; align-items: center; min-height: 84px; padding: 14px 8px; text-decoration: none; border-bottom: 1px solid rgba(164,190,220,.18); }
.tds-resource-link:hover,
.tds-resource-link:focus-visible,
.tds-resource-link.is-active { background: linear-gradient(90deg, rgba(53,169,244,.12), transparent 80%); outline: none; }
.tds-resource-num { color: #7290b2; font: 600 13px/1.2 var(--tds-font); letter-spacing: .08em; }
.tds-resource-copy { min-width: 0; display: grid; gap: 3px; }
.tds-resource-copy strong { color: #f8fbff; font: 600 18px/1.35 var(--tds-font); }
.tds-resource-copy span { color: #91a9c3; font: 400 16px/1.5 var(--tds-font); }
.tds-resource-arrow { justify-self: end; color: #6f8eaf; font: 400 26px/1 var(--tds-font); transition: color .15s ease, transform .15s ease; }
.tds-resource-link:hover .tds-resource-arrow,
.tds-resource-link:focus-visible .tds-resource-arrow,
.tds-resource-link.is-active .tds-resource-arrow { color: var(--tds-orange); transform: translateX(4px); }
.tds-preview { position: sticky; top: max(28px, calc(50vh - 270px)); align-self: start; max-height: calc(100vh - 56px); overflow: auto; display: grid; grid-template-columns: 168px minmax(0,1fr); gap: 24px; padding: 24px; background: #10233e; border: 1px solid rgba(141,203,244,.28); border-radius: 8px; box-shadow: 0 28px 70px rgba(0,0,0,.24); }
.tds-preview > img { width: 168px; aspect-ratio: .772; object-fit: cover; border-radius: 3px; box-shadow: 0 16px 34px rgba(0,0,0,.32); }
.tds-preview h2 { margin: 0; color: var(--tds-white); font: 600 26px/1.25 var(--tds-font); letter-spacing: -.015em; }
.tds-preview-description { margin: 14px 0 0; color: #d3dfec; font: 400 16px/1.5 var(--tds-font); }
.tds-preview-learn { margin: 18px 0 0; display: grid; gap: 4px; color: #b8c9db; font: 400 16px/1.5 var(--tds-font); }
.tds-preview-learn strong { color: var(--tds-blue-soft); font-weight: 600; }
.tds-preview-time { margin: 14px 0 0; color: #8fa7c1; font: 400 16px/1.5 var(--tds-font); }
.tds-preview-actions { margin-top: 22px; display: flex; align-items: center; flex-wrap: wrap; gap: 16px; }
.tds-button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 11px 18px; border: 1px solid var(--tds-orange); background: var(--tds-orange); color: #08111f !important; text-decoration: none; text-transform: uppercase; letter-spacing: .08em; font: 700 12px/1.2 var(--tds-font); }
.tds-button:hover,
.tds-button:focus-visible { background: #ff9d4d; border-color: #ff9d4d; }
.tds-text-link { color: var(--tds-blue-soft) !important; text-underline-offset: 4px; font: 600 14px/1.4 var(--tds-font); }

.tds-site-footer { padding: 34px max(28px, calc((100vw - var(--tds-max)) / 2)); display: flex; align-items: center; justify-content: space-between; gap: 24px; background: var(--tds-navy-950); color: #9eb0c4; border-top: 1px solid rgba(255,255,255,.08); }
.tds-site-footer p { margin: 0; color: #ecf3fa; text-transform: uppercase; letter-spacing: .12em; font: 600 13px/1.4 var(--tds-font); }
.tds-site-footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 12px 24px; }
.tds-site-footer a { text-decoration: none; font: 400 16px/1.5 var(--tds-font); }
.tds-site-footer a:hover { color: var(--tds-blue-soft); }

.tds-document-hero { position: relative; isolation: isolate; min-height: 720px; padding: 96px max(28px, calc((100vw - var(--tds-max)) / 2)) 120px; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 78px; align-items: center; overflow: hidden; background: var(--tds-navy-900); color: var(--tds-white); }
.tds-document-hero::before { content: ""; position: absolute; z-index: -1; width: 620px; height: 620px; right: max(-170px, calc((100vw - var(--tds-max)) / 2 - 250px)); top: 50%; transform: translateY(-50%); border-radius: 50%; background: radial-gradient(circle, var(--tds-series-wash) 0 38%, transparent 39% 49%, rgba(255,255,255,.035) 50% 50.5%, transparent 51% 100%); }
.tds-document-hero::after { content: ""; position: absolute; z-index: -1; inset: 0; opacity: .16; background-image: linear-gradient(rgba(141,203,244,.13) 1px, transparent 1px), linear-gradient(90deg, rgba(141,203,244,.13) 1px, transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(90deg, transparent 0 52%, #000 82%, transparent 100%); }
.tds-breadcrumbs { margin-bottom: 44px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; color: #8fa7c1; font: 400 16px/1.5 var(--tds-font); }
.tds-breadcrumbs a { text-decoration: none; }
.tds-breadcrumbs a:hover { color: var(--tds-blue-soft); }
.tds-document-hero-copy { max-width: 760px; }
.tds-document-hero h1 { max-width: 14ch; }
.tds-rule { max-width: 62ch; margin: 28px 0 0; color: #f0f5fb; font: 400 21px/1.6 var(--tds-font); }
.tds-document-topic { margin: 24px 0 0; color: var(--tds-blue-soft); font: 600 18px/1.6 var(--tds-font); }
.tds-document-meta { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 10px 22px; color: #99aec5; font: 400 16px/1.5 var(--tds-font); }
.tds-document-meta span + span::before { content: "·"; margin-right: 22px; color: var(--tds-orange); }
.tds-gates,
.tds-source-line { max-width: 70ch; margin: 20px 0 0; color: #9fb3ca; font: 400 16px/1.5 var(--tds-font); }
.tds-gate-strip { max-width: 760px; margin-top: 28px; display: flex; flex-wrap: wrap; gap: 8px; align-items: stretch; }
.tds-gate-label { flex: 0 0 100%; margin-bottom: 2px; color: #839ab4; text-transform: uppercase; letter-spacing: .12em; font: 600 11px/1.4 var(--tds-font); }
.tds-gate { min-width: 96px; padding: 9px 11px 8px; display: grid; gap: 1px; border: 1px solid rgba(141,203,244,.20); background: rgba(255,255,255,.035); }
.tds-gate strong { color: #eaf3fb; font: 600 12px/1.3 var(--tds-font); }
.tds-gate small { color: #8ba2bb; text-transform: uppercase; letter-spacing: .08em; font: 600 9px/1.3 var(--tds-font); }
.tds-gate-primary { border-color: color-mix(in srgb, var(--tds-series-accent) 62%, transparent); background: color-mix(in srgb, var(--tds-series-accent) 12%, transparent); }
.tds-gate-primary strong { color: var(--tds-white); }
.tds-gate-primary small { color: var(--tds-series-accent); }
.tds-hero-actions { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 14px; }
.tds-button-secondary { background: transparent; color: #f4f8fc !important; border-color: #7d96b2; }
.tds-button-secondary:hover,
.tds-button-secondary:focus-visible { background: #172d4a; border-color: var(--tds-blue-soft); }
.tds-document-cover { margin: 0; }
.tds-cover-frame { position: relative; width: min(100%, 286px); margin: 0 auto; }
.tds-cover-frame::before { content: ""; position: absolute; inset: 18px -18px -18px 18px; border: 1px solid color-mix(in srgb, var(--tds-series-accent) 52%, transparent); background: color-mix(in srgb, var(--tds-series-accent) 8%, transparent); }
.tds-cover-frame::after { content: ""; position: absolute; width: 54px; height: 3px; left: -28px; top: 42px; background: var(--tds-series-accent); box-shadow: 0 10px 0 rgba(255,255,255,.22); }
.tds-document-cover img { position: relative; z-index: 1; display: block; width: 100%; aspect-ratio: .772; object-fit: cover; border-radius: 2px; box-shadow: 0 30px 70px rgba(0,0,0,.42); }
.tds-document-cover > p { margin: 24px 0 0; color: #b8c9db; font: 400 16px/1.5 var(--tds-font); }
.tds-document-cover > p strong { display: block; margin-bottom: 4px; color: var(--tds-orange); font-weight: 600; }
.tds-transition { height: 240px; margin: 0; background: linear-gradient(180deg, #0a1628 0%, #12233d 38%, #2e4468 65%, #7a8ca6 82%, #d6dce5 94%, #fafaf8 100%); }
.tds-paper-layout { width: min(var(--tds-max), calc(100% - 56px)); margin: 0 auto; padding: 110px 0 128px; display: grid; grid-template-columns: 250px minmax(0, 800px); gap: 72px; align-items: start; }
.tds-toc { position: sticky; top: 32px; max-height: calc(100vh - 64px); overflow: auto; padding-right: 24px; border-right: 1px solid var(--tds-line); }
.tds-toc ol { margin: 0; padding: 0; list-style: none; }
.tds-toc li { margin: 0 0 11px; }
.tds-toc li.level-3 { padding-left: 14px; }
.tds-toc a { color: #536176; text-decoration: none; font: 400 14px/1.45 var(--tds-font); }
.tds-toc a:hover,
.tds-toc a.is-current { color: #176fa8; }
.tds-toc a.is-current { font-weight: 600; }
.tds-toc a.is-current::before { content: ""; display: inline-block; width: 10px; height: 2px; margin: 0 7px 4px 0; background: var(--tds-series-accent); }
.tds-paper-column { min-width: 0; max-width: 800px; }
.tds-reading-map { margin: 0 0 72px; padding: 20px 0; display: grid; grid-template-columns: .8fr .55fr 1.65fr; border-top: 1px solid #b8c7d7; border-bottom: 1px solid #d7e0e8; }
.tds-reading-map > span { min-width: 0; padding: 0 20px; display: grid; gap: 4px; border-right: 1px solid var(--tds-line); }
.tds-reading-map > span:first-child { padding-left: 0; }
.tds-reading-map > span:last-child { padding-right: 0; border-right: 0; }
.tds-reading-map small { color: #748195; text-transform: uppercase; letter-spacing: .1em; font: 600 10px/1.35 var(--tds-font); }
.tds-reading-map strong { color: var(--tds-ink); font: 600 15px/1.4 var(--tds-font); }
.tds-paper-body { min-width: 0; max-width: 800px; counter-reset: tds-section; }
.tds-paper-body > :first-child { margin-top: 0; }
.tds-paper-body h2 { position: relative; margin: 86px 0 26px; padding-top: 28px; color: var(--tds-ink); font: 400 40px/1.15 var(--tds-font); letter-spacing: -.025em; scroll-margin-top: 28px; counter-increment: tds-section; }
.tds-paper-body h2::before { content: counter(tds-section, decimal-leading-zero); position: absolute; top: 0; left: 0; color: var(--tds-series-accent); text-transform: uppercase; letter-spacing: .12em; font: 700 12px/1.3 var(--tds-font); }
.tds-paper-body h2::after { content: ""; position: absolute; top: 7px; left: 34px; width: 76px; height: 1px; background: linear-gradient(90deg, var(--tds-series-accent), transparent); }
.tds-paper-body h2.tds-heading-action { padding: 28px 28px 26px; border: 1px solid #d6e0e9; border-left: 4px solid var(--tds-series-accent); background: linear-gradient(120deg, var(--tds-series-wash), rgba(255,255,255,.76)); }
.tds-paper-body h2.tds-heading-action::before { left: 28px; top: 11px; }
.tds-paper-body h2.tds-heading-action::after { left: 62px; top: 18px; }
.tds-paper-body h2.tds-heading-example::before { color: var(--tds-orange); }
.tds-paper-body h2.tds-heading-example::after { background: linear-gradient(90deg, var(--tds-orange), transparent); }
.tds-paper-body h2.tds-heading-signal { border-bottom: 1px solid color-mix(in srgb, var(--tds-series-accent) 38%, var(--tds-line)); padding-bottom: 20px; }
.tds-paper-body h3 { margin: 52px 0 20px; color: var(--tds-ink); font: 600 26px/1.25 var(--tds-font); letter-spacing: -.012em; scroll-margin-top: 28px; }
.tds-paper-body p,
.tds-paper-body li { color: #29364a; font: 400 18px/1.6 var(--tds-font); }
.tds-paper-body p { margin: 0 0 24px; }
.tds-paper-body .tds-paper-lead { margin-bottom: 34px; color: #18283f; font-size: 21px; line-height: 1.6; }
.tds-paper-body .tds-insight-card { margin: 34px 0; padding: 22px 24px 22px 28px; border-left: 3px solid var(--tds-series-accent); background: linear-gradient(110deg, var(--tds-series-wash), rgba(255,255,255,.45)); color: #20324a; }
.tds-paper-body .tds-insight-card strong:first-child { color: #102a4a; }
.tds-paper-body ul,
.tds-paper-body ol { margin: 4px 0 30px; padding-left: 26px; }
.tds-paper-body li { margin: 0 0 12px; padding-left: 6px; }
.tds-paper-body li::marker { color: var(--tds-series-accent); font-weight: 700; }
.tds-paper-body strong { font-weight: 700; }
.tds-paper-body blockquote { margin: 40px 0; padding: 4px 0 4px 26px; border-left: 3px solid var(--tds-orange); color: #1b3e67; font: 600 21px/1.6 var(--tds-font); }
.tds-paper-body a { color: #126ea8; text-underline-offset: 3px; }
.tds-table-wrap { margin: 34px 0; max-width: 100%; overflow-x: auto; }
.tds-paper-body table { width: 100%; border-collapse: collapse; font: 400 16px/1.5 var(--tds-font); }
.tds-paper-body th,
.tds-paper-body td { padding: 13px 15px; border: 1px solid #ccd6e0; text-align: left; vertical-align: top; }
.tds-paper-body th { background: #eaf0f5; font-weight: 600; }
.tds-paper-body tbody tr:nth-child(even) { background: rgba(235,241,246,.58); }
.tds-related { padding: 104px max(28px, calc((100vw - var(--tds-max)) / 2)) 120px; background: #eaf0f5; }
.tds-related h2 { max-width: 760px; margin: 0 0 34px; color: var(--tds-ink); font: 400 40px/1.15 var(--tds-font); letter-spacing: -.025em; }
.tds-related-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 18px; }
.tds-related-grid > a { min-height: 180px; padding: 20px; display: grid; grid-template-columns: 92px minmax(0,1fr); gap: 18px; align-items: center; background: var(--tds-white); border: 1px solid #d4dde7; text-decoration: none; }
.tds-related-grid img { width: 92px; aspect-ratio: .772; object-fit: cover; box-shadow: 0 9px 22px rgba(15,31,51,.15); }
.tds-related-grid span { display: grid; gap: 7px; }
.tds-related-grid strong { color: var(--tds-ink); font: 600 18px/1.35 var(--tds-font); }
.tds-related-grid small { color: #647084; font: 400 16px/1.5 var(--tds-font); }
.tds-up-links { margin: 32px 0 0; display: flex; flex-wrap: wrap; gap: 24px; }
.tds-up-links a { color: #176fa8; font: 600 16px/1.5 var(--tds-font); text-underline-offset: 4px; }

.tds-shelf-page { min-height: 80vh; padding: 104px max(28px, calc((100vw - var(--tds-max)) / 2)) 128px; background: var(--tds-paper); }
.tds-shelf-intro { max-width: 800px; margin-bottom: 64px; }
.tds-shelf-intro .tds-breadcrumbs { margin-bottom: 34px; color: #66758a; }
.tds-shelf-intro > p:last-child { margin: 26px 0 0; max-width: 65ch; color: #526074; font: 400 21px/1.6 var(--tds-font); }
.tds-shelf-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 18px; }
.tds-shelf-card { min-height: 220px; padding: 22px; display: grid; grid-template-columns: 120px minmax(0,1fr); gap: 24px; align-items: center; background: var(--tds-white); border: 1px solid var(--tds-line); }
.tds-shelf-card img { display: block; width: 120px; aspect-ratio: .772; object-fit: cover; box-shadow: 0 10px 24px rgba(16,34,56,.14); }
.tds-shelf-card h2 { margin: 0; font: 600 26px/1.25 var(--tds-font); }
.tds-shelf-card h2 a { text-decoration: none; }
.tds-shelf-card h2 a:hover { color: #176fa8; }
.tds-shelf-card div > p:last-child { margin: 12px 0 0; color: #637084; font: 400 18px/1.6 var(--tds-font); }

@media (max-width: 980px) {
  .tds-group-open { grid-template-columns: 1fr; }
  .tds-preview { position: relative; top: auto; max-height: none; }
  .tds-document-hero { grid-template-columns: minmax(0,1fr) 240px; gap: 48px; }
  .tds-paper-layout { grid-template-columns: 1fr; }
  .tds-toc { position: static; max-height: none; padding: 24px; border: 1px solid var(--tds-line); background: #fff; }
  .tds-related-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .tds-sitebar { padding: 16px 20px; align-items: flex-start; }
  .tds-sitebar nav { justify-content: flex-end; flex-wrap: wrap; gap: 9px 16px; }
  .tds-sitebar nav a:first-child { display: none; }
  .tds-library-page { width: calc(100% - 36px); padding: 72px 0 88px; }
  .tds-library-intro { margin-bottom: 46px; }
  .tds-library-search { grid-template-columns: 1fr; margin: -8px 0 38px; padding: 21px 20px; gap: 16px; }
  .tds-search-status { grid-column: 1; }
  .tds-library-intro h1,
  .tds-document-hero h1,
  .tds-shelf-intro h1 { font-size: 44px; }
  .tds-library-group summary { min-height: 0; padding: 24px 20px; align-items: flex-start; }
  .tds-group-copy > strong { font-size: 24px; }
  .tds-group-open { padding: 8px 18px 24px; gap: 28px; }
  .tds-resource-link { grid-template-columns: 30px minmax(0,1fr) 22px; gap: 10px; }
  .tds-preview { grid-template-columns: 105px minmax(0,1fr); padding: 18px; gap: 18px; }
  .tds-preview > img { width: 105px; }
  .tds-preview h2 { font-size: 22px; }
  .tds-document-hero { min-height: 0; padding: 72px 20px 88px; grid-template-columns: 1fr; }
  .tds-document-hero h1 { max-width: none; }
  .tds-document-cover { max-width: 300px; }
  .tds-cover-frame::after { left: -14px; }
  .tds-transition { height: 210px; }
  .tds-paper-layout { width: calc(100% - 40px); padding: 82px 0 92px; }
  .tds-paper-body h2 { font-size: 34px; }
  .tds-reading-map { margin-bottom: 54px; grid-template-columns: 1fr 1fr; }
  .tds-reading-map > span { padding: 0 14px; }
  .tds-reading-map > span:nth-child(2) { border-right: 0; }
  .tds-reading-map > span:last-child { grid-column: 1 / -1; margin-top: 16px; padding: 16px 0 0; border-top: 1px solid var(--tds-line); }
  .tds-paper-body h2.tds-heading-action { padding-left: 20px; padding-right: 20px; }
  .tds-paper-body h2.tds-heading-action::before { left: 20px; }
  .tds-paper-body h2.tds-heading-action::after { left: 54px; }
  .tds-paper-body .tds-paper-lead { font-size: 20px; }
  .tds-related { padding: 78px 20px 88px; }
  .tds-related h2 { font-size: 34px; }
  .tds-related-grid > a { grid-template-columns: 76px minmax(0,1fr); }
  .tds-related-grid img { width: 76px; }
  .tds-shelf-page { padding: 76px 20px 88px; }
  .tds-shelf-grid { grid-template-columns: 1fr; }
  .tds-site-footer { padding: 28px 20px; align-items: flex-start; flex-direction: column; }
}

@media (max-width: 782px) {
  .admin-bar .tds-reading-progress { top: 46px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .001ms !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
}

/* Ranked search: the problem statement that matched the visitor's query. */
.tds-resource-copy .tds-match-note { display: block; margin: 6px 0 0; color: #9eb1c8; font: 400 14px/1.45 var(--tds-font); border-left: 2px solid rgba(141,203,244,.34); padding-left: 10px; }
body.tds-v2-shelf .tds-resource-copy .tds-match-note { color: var(--tds-muted); border-left-color: var(--tds-line); }