.transport-burden { scroll-margin-top: 5rem; }
.transport-burden-inner { max-width: 1160px; margin: 0 auto; }
.transport-burden-opening { max-width: 890px; margin-bottom: 1.5rem; }
.transport-burden-opening h2 { max-width: 820px; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.08; letter-spacing: -.025em; }
.transport-burden-lead { font-size: clamp(1.06rem, 1.7vw, 1.28rem); line-height: 1.55; }
.tb-hero-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .7rem; margin: 1.5rem 0; }
.tb-hero-stats>div { padding: 1rem 1.1rem; background: var(--blue); color: #fff; border-radius: var(--radius); min-width: 0; }
.tb-hero-stats strong { display: block; font-size: clamp(1.65rem, 2.6vw, 2.55rem); line-height: 1.08; font-variant-numeric: tabular-nums; }
.tb-hero-stats span { display: block; margin-top: .45rem; font-size: .88rem; line-height: 1.3; }
.tb-transition { border-left: 5px solid var(--gold); padding: .45rem 0 .45rem 1rem; font-size: 1.12rem; font-weight: 700; max-width: 850px; }
.tb-panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(1rem, 2.5vw, 1.8rem); margin: 1.2rem 0; box-shadow: var(--shadow); }
.tb-panel h3 { margin: .25rem 0 .65rem; font-size: clamp(1.35rem, 2.3vw, 2rem); line-height: 1.2; }
.tb-panel p { max-width: 900px; }
.tb-distribution figure { margin: 1rem 0 .5rem; }
.tb-distribution svg, .tb-signal svg { width: 100%; height: auto; background: #f9fbfa; border: 1px solid var(--line); border-radius: 7px; }
.tb-distribution figcaption, .tb-signal figcaption { color: var(--muted); font-size: .86rem; line-height: 1.4; }
.tb-svg-ref { fill: #334a54; font-size: 12px; font-weight: 700; }
.tb-svg-axis { fill: #334a54; font-size: 13px; }
.tb-rank-list { list-style: none; margin: .9rem 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .55rem; }
.tb-rank-list li { border-top: 4px solid var(--gold); background: var(--panel-alt); padding: .65rem; min-width: 0; }
.tb-rank-list strong, .tb-rank-list span { display: block; font-size: .88rem; line-height: 1.35; }
.tb-rank-list span { margin-top: .25rem; font-variant-numeric: tabular-nums; }
.tb-persistence-callouts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .65rem; margin: 1.1rem 0; }
.tb-persistence-callouts>div { background: var(--panel-alt); border-left: 4px solid var(--teal); padding: .75rem; }
.tb-persistence-callouts strong { display: block; color: var(--blue); font-size: clamp(1.25rem, 1.9vw, 1.65rem); font-variant-numeric: tabular-nums; }
.tb-persistence-callouts span { display: block; margin-top: .3rem; font-size: .84rem; }
.tb-chart-key { display: flex; flex-wrap: wrap; gap: .7rem 1.3rem; font-size: .82rem; color: var(--muted); }
.tb-chart-key span::before { content: ""; display: inline-block; width: 2rem; margin-right: .35rem; vertical-align: middle; border-top: 3px solid var(--teal); }
.tb-chart-key .tb-key-dash::before { border-top: 2px dashed #8a6b4a; }
.tb-chart-key .tb-key-dot::before { border-top: 2px dotted #8a6b4a; }
.tb-chart-key .tb-key-band::before { height: .75rem; border: 1px solid #9bb3b6; background: #bdced1; }
.tb-physiology-case { scroll-margin-top: 5rem; border-left: 5px solid var(--gold); }
.tb-physiology-callouts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; margin: 1rem 0; }
.tb-physiology-callouts>div { padding: .9rem; background: var(--panel-alt); border-left: 4px solid #a53f20; }
.tb-physiology-callouts strong { display: block; color: var(--blue); font-size: clamp(1.4rem, 2vw, 1.85rem); font-variant-numeric: tabular-nums; }
.tb-physiology-callouts span { display: block; margin-top: .35rem; font-size: .87rem; line-height: 1.45; }
.tb-physiology-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.tb-prospective { border-left: 5px solid var(--gold); scroll-margin-top: 5rem; }
.tb-prospective-callouts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .65rem; margin: 1rem 0 1.35rem; }
.tb-prospective-callouts>div { min-width: 0; padding: .8rem; background: var(--panel-alt); border-top: 4px solid var(--teal); }
.tb-prospective-callouts strong { display: block; color: var(--blue); font-size: clamp(1.35rem, 2vw, 1.8rem); font-variant-numeric: tabular-nums; }
.tb-prospective-callouts span { display: block; margin-top: .35rem; font-size: .84rem; line-height: 1.4; }
.tb-prospective-chart { max-width: 850px; margin: .8rem 0 1.2rem; }
.tb-prospective-axis, .tb-prospective-percentile-row { display: grid; grid-template-columns: minmax(8rem, 1.2fr) minmax(8rem, 4fr) minmax(3.5rem, .7fr); gap: .7rem; align-items: center; }
.tb-prospective-axis { grid-column: 2; display: flex; justify-content: space-between; color: var(--muted); font-size: .75rem; padding: 0 .1rem .25rem; }
.tb-prospective-percentile-row { margin: .35rem 0; font-size: .88rem; }
.tb-prospective-percentile-row strong { font-variant-numeric: tabular-nums; }
.tb-prospective-percentile-track { position: relative; display: block; height: .7rem; border-radius: 1rem; background: linear-gradient(90deg, #e8efef 0 25%, #d8e5e4 25% 50%, #c6d9d8 50% 75%, #b2cecc 75% 100%); }
.tb-prospective-percentile-track>span { position: absolute; top: -.2rem; width: .18rem; height: 1.1rem; border-radius: 2px; background: #9b5218; transform: translateX(-50%); box-shadow: 0 0 0 2px white; }
.tb-prospective-tracks { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .65rem; margin: 1rem 0; }
.tb-prospective-tracks article { padding: .8rem; background: var(--panel-alt); border-left: 3px solid var(--teal); }
.tb-prospective-tracks h4 { margin-top: 0; }
.tb-prospective-tracks p { margin-bottom: 0; font-size: .9rem; }
.tb-prospective-lead { font-size: 1.08rem; font-weight: 600; }
.tb-prospective code { overflow-wrap: anywhere; }
.tb-physiology-signal { margin: 0; padding: .8rem; border: 1px solid var(--line); border-radius: 7px; min-width: 0; }
.tb-physiology-signal figcaption { display: flex; justify-content: space-between; gap: .4rem; flex-wrap: wrap; font-size: .85rem; line-height: 1.4; }
.tb-physiology-signal svg { width: 100%; height: auto; margin-top: .45rem; background: #f9fbfa; border: 1px solid var(--line); border-radius: 7px; }
.tb-signal-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.tb-signal { margin: 0; padding: .8rem; border: 1px solid var(--line); border-radius: 7px; min-width: 0; }
.tb-signal figcaption { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .3rem; margin-bottom: .55rem; }
.tb-signal figcaption strong { color: var(--ink); }
.tb-table-scroll { overflow-x: auto; max-width: 100%; }
.tb-panel table { width: 100%; border-collapse: collapse; margin: .6rem 0; font-size: .88rem; font-variant-numeric: tabular-nums; }
.tb-panel caption { text-align: left; color: var(--muted); font-size: .85rem; padding: .35rem 0; }
.tb-panel th, .tb-panel td { text-align: left; padding: .55rem .6rem; border-bottom: 1px solid var(--line); white-space: nowrap; }
.tb-panel thead th { background: var(--panel-alt); }
.tb-panel th span { font-size: .75rem; color: var(--muted); }
.tb-trajectory tbody tr:last-child { border-bottom: 0; }
.tb-trajectory tbody td:last-child { font-weight: 800; color: var(--blue); background: #eef7f6; }
.tb-details { scroll-margin-top: 6rem; }
.tb-details summary { cursor: pointer; font-weight: 800; color: var(--blue); padding: .25rem 0; }
.tb-details summary:focus-visible, .transport-burden a:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; }
.tb-signature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }
.tb-signature-card { padding: 1rem; border: 1px solid var(--line); border-radius: 7px; background: #fbfcfc; min-width: 0; }
.tb-signature-card h4 { margin: .2rem 0 .4rem; color: var(--blue); font-size: 1.14rem; }
.tb-signature-card p { margin: .25rem 0 .75rem; font-size: .86rem; }
.tb-signature-date { font-weight: 800; font-variant-numeric: tabular-nums; }
.tb-signature-row { display: grid; grid-template-columns: minmax(7.5rem, 1fr) minmax(5rem, 1.5fr) 3.4rem; align-items: center; gap: .45rem; margin: .38rem 0; font-size: .82rem; }
.tb-signature-row strong { text-align: right; font-variant-numeric: tabular-nums; }
.tb-signature-track { height: .7rem; background: #dde8e7; border: 1px solid #b9cecb; border-radius: 999px; overflow: hidden; }
.tb-signature-track span { display: block; height: 100%; background: var(--teal); }
.tb-technical[open] { border-left: 5px solid var(--gold); }
.tb-details dl { display: grid; gap: .4rem; }
.tb-details dl div { display: grid; grid-template-columns: minmax(9rem, 13rem) 1fr; gap: .5rem; border-bottom: 1px solid var(--line); padding: .4rem 0; }
.tb-details dt { font-weight: 800; }
.tb-details dd { margin: 0; overflow-wrap: anywhere; }
.tb-error { color: #8a230d; font-weight: 800; }
@media (max-width: 850px) { .tb-rank-list { grid-template-columns: repeat(3, minmax(0, 1fr)); } .tb-signal-grid, .tb-signature-grid, .tb-physiology-grid { grid-template-columns: 1fr; } }
@media (max-width: 620px) { .tb-hero-stats, .tb-persistence-callouts, .tb-prospective-callouts { grid-template-columns: repeat(2, minmax(0, 1fr)); } .tb-physiology-callouts, .tb-rank-list { grid-template-columns: 1fr; } .tb-prospective-tracks { grid-template-columns: 1fr; } .tb-prospective-axis, .tb-prospective-percentile-row { grid-template-columns: minmax(6.5rem, 1.1fr) minmax(5rem, 3fr) minmax(3.2rem, .7fr); gap: .45rem; font-size: .82rem; } .tb-details dl div { grid-template-columns: 1fr; } .tb-svg-ref { font-size: 10px; } }