/* TSRA sequence observatory — data-backed primary surface */

.legacy-stats,
.viewer-pill {
    display: none !important;
}

.sequence-root {
    display: grid;
    gap: var(--field-gap);
}

/* Grid items default to min-width:auto, which lets a wide table or chart set the
   page's min-content width and scroll the whole document sideways. Keeping the
   items at min-width:0 confines that overflow to each deliberate scroll container. */
.sequence-root > *,
.releases-root > *,
.method-root > *,
.archive-root > * {
    min-width: 0;
}

.sequence-hero {
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(0, 1.55fr) minmax(270px, .75fr);
    gap: clamp(1.4rem, 4vw, 4rem);
    padding: clamp(1.6rem, 3.4vw, 2.8rem);
    border: 1px solid var(--line);
    border-radius: var(--plate-radius);
    /* Base is var(--bg) itself, not the separate --paper-warm swatch — in dark
       theme --paper-warm (#100f0e) sits a few points above the true page ground
       (#0d0c0a), which reads as a visible seam over a plate this large. The
       diagonal tint still gives it quiet warmth without breaking the field. */
    background: linear-gradient(135deg, color-mix(in srgb, var(--surface2) 72%, transparent), transparent 58%),
        var(--bg);
}

.sequence-hero::after {
    content: "";
    position: absolute;
    inset: 0 0 0 auto;
    width: min(42%, 520px);
    pointer-events: none;
    opacity: .2;
    background:
        repeating-linear-gradient(112deg, transparent 0 17px, color-mix(in srgb, var(--accent) 24%, transparent) 18px 19px),
        linear-gradient(90deg, transparent, color-mix(in srgb, var(--accent2) 13%, transparent));
    mask-image: linear-gradient(90deg, transparent, #000);
}

.sequence-hero-main,
.sequence-capture-register {
    position: relative;
    z-index: 1;
}

.sequence-kicker,
.sequence-status,
.sequence-capture-label,
.sequence-metric-label,
.sequence-card-kicker {
    font-family: var(--mono);
    font-size: .62rem;
    letter-spacing: .11em;
    text-transform: uppercase;
}

.sequence-kicker {
    color: var(--accent);
    margin-bottom: .65rem;
}

.sequence-verdict {
    max-width: 780px;
    font-family: var(--serif);
    font-weight: 400;
    font-size: clamp(1.7rem, 3.4vw, 3rem);
    line-height: 1.1;
    letter-spacing: -.03em;
    text-wrap: balance;
}

.sequence-verdict-class {
    display: flex;
    align-items: center;
    gap: .6rem;
    margin-top: 1rem;
    color: var(--text-sub);
    font-size: .76rem;
}

.sequence-verdict-class strong {
    color: var(--accent2);
    font-family: var(--mono);
    font-size: .62rem;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.sequence-capture-register {
    align-self: stretch;
    display: grid;
    align-content: center;
    gap: .8rem;
    padding-left: clamp(1rem, 2.6vw, 2.2rem);
    border-left: 1px solid var(--line);
}

.sequence-capture-row {
    display: grid;
    gap: .15rem;
}

.sequence-capture-label {
    color: var(--muted);
}

.sequence-capture-value {
    color: var(--text);
    font-size: .86rem;
}

.sequence-status {
    display: inline-flex;
    width: fit-content;
    align-items: center;
    gap: .45rem;
    color: var(--text-sub);
}

.sequence-status::before {
    content: "";
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--muted);
}

.sequence-status.is-ready::before {
    background: var(--accent2);
}

.sequence-status.is-blocked {
    color: var(--warn);
}

.sequence-status.is-blocked::before {
    background: var(--warn);
}

/* No box: three ruled columns on the open page. Each item carries its own
   hairline top rule; whitespace, not borders, separates the columns. */
.sequence-boundary-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.5rem);
    padding: .35rem var(--plate-pad) 0;
}

.sequence-boundary-item {
    min-width: 0;
    padding: .8rem 0 0;
    border-top: 1px solid var(--line);
    color: var(--text-sub);
    font-size: .74rem;
    line-height: 1.5;
}

.sequence-boundary-item strong {
    display: block;
    margin-bottom: .12rem;
    color: var(--text);
    font-family: var(--mono);
    font-size: .62rem;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.sequence-metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.5rem);
    padding: .5rem var(--plate-pad) .9rem;
}

/* Stat block, not a card: hairline top rule, open ground, the numeral carries
   the weight. The rule is the only drawn structure. */
.sequence-metric {
    min-width: 0;
    padding: .8rem 0 0;
    border-top: 1px solid var(--line);
}

.sequence-metric-label {
    color: var(--muted);
}

.sequence-metric-value {
    margin-top: .25rem;
    font-family: var(--mono);
    font-size: clamp(1.45rem, 3vw, 2.15rem);
    line-height: 1;
}

.sequence-metric-note {
    margin-top: .35rem;
    color: var(--text-sub);
    font-size: .7rem;
}

/* Open plate: a single strong top rule announces the section, same grammar as
   the .card override layer. The hero stays the one framed anchor per surface. */
.sequence-activity-card {
    padding: 1.35rem var(--plate-pad) .4rem;
    border-top: 1px solid var(--line-strong);
}

.sequence-card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
}

.sequence-card-kicker {
    color: var(--accent);
    margin-bottom: .2rem;
}

.sequence-card-title {
    font-family: var(--serif);
    font-size: clamp(1.1rem, 2vw, 1.45rem);
    font-weight: 500;
}

.sequence-download {
    flex: 0 0 auto;
    color: var(--text-sub);
    font-family: var(--mono);
    font-size: .65rem;
    text-decoration: none;
    border-bottom: 1px solid var(--line-strong);
    padding-bottom: .15rem;
}

.sequence-download:hover,
.sequence-download:focus-visible {
    color: var(--accent);
    border-color: var(--accent);
}

.sequence-chart-wrap {
    position: relative;
    width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
}

.sequence-day-hit {
    fill: transparent;
}

.sequence-gap-band {
    fill: color-mix(in srgb, var(--text-sub) 3%, transparent);
    stroke: color-mix(in srgb, var(--text-sub) 34%, transparent);
    stroke-width: .8;
    stroke-dasharray: 5 6;
}

.sequence-gap-label {
    fill: color-mix(in srgb, var(--muted) 78%, transparent);
    font-family: var(--mono);
    font-size: 9px;
    letter-spacing: .14em;
}

.sequence-day-group {
    outline: none;
}

.sequence-day-group:hover .sequence-day-hit,
.sequence-day-group:focus-visible .sequence-day-hit {
    fill: color-mix(in srgb, var(--text) 4%, transparent);
}

.sequence-day-group:focus-visible .sequence-day-hit {
    stroke: var(--accent);
    stroke-width: 1;
}

/* Reading plate for one day. Thin and translucent by design — a hover readout,
   not another card: hairline edge, low-opacity ground, minimal padding. Positioned
   from the pointer, clamped inside the chart so it never leaves the scroll
   container or covers the axis. */
.sequence-chart-tooltip {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    min-width: 168px;
    max-width: 230px;
    padding: .55rem .65rem;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: color-mix(in srgb, var(--paper-warm) 74%, transparent);
    color: var(--text);
    pointer-events: none;
    opacity: 0;
    left: var(--tip-x, 0px);
    top: var(--tip-y, 0px);
    transform: translate(14px, -50%);
    transition: opacity .12s var(--ease);
}

/* Flipped when the plate would run past the right edge of the scroll container. */
.sequence-chart-tooltip.is-flipped {
    transform: translate(calc(-100% - 14px), -50%);
}

.sequence-chart-tooltip.is-visible {
    opacity: 1;
}

.sequence-tip-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: .6rem;
    padding-bottom: .32rem;
    border-bottom: 1px solid var(--line);
}

.sequence-tip-date {
    font-family: var(--serif);
    font-size: .86rem;
}

.sequence-tip-total {
    color: var(--accent);
    font-family: var(--mono);
    font-size: .66rem;
}

.sequence-tip-coverage {
    margin-top: .32rem;
    color: var(--warn);
    font-family: var(--mono);
    font-size: .53rem;
    letter-spacing: .07em;
    text-transform: uppercase;
    line-height: 1.4;
}

.sequence-tip-list {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: .12rem .6rem;
    margin-top: .38rem;
}

.sequence-tip-term {
    display: flex;
    align-items: center;
    gap: .35rem;
    min-width: 0;
    color: var(--text-sub);
    font-size: .65rem;
}

.sequence-tip-swatch {
    flex: 0 0 auto;
    width: 7px;
    height: 7px;
    border-radius: 2px;
    background: var(--muted);
}

.sequence-tip-swatch.sequence-bar--below-m2 { background: var(--seq-below-m2); }
.sequence-tip-swatch.sequence-bar--m2 { background: var(--seq-m2); }
.sequence-tip-swatch.sequence-bar--m3 { background: var(--seq-m3); }
.sequence-tip-swatch.sequence-bar--m4 { background: var(--seq-m4); }
.sequence-tip-swatch.sequence-bar--m5 { background: var(--seq-m5); }

.sequence-tip-value {
    color: var(--text);
    font-family: var(--mono);
    font-size: .66rem;
    text-align: right;
}

.sequence-tip-max {
    margin-top: .4rem;
    padding-top: .32rem;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: .58rem;
    line-height: 1.4;
}

@media (prefers-reduced-motion: reduce) {
    .sequence-chart-tooltip {
        transition: none;
    }
}

/* Deliberate scroll containers get a hairline scrollbar in the same tonal language
   as the plate borders — the default chrome bar reads as a foreign white slab.
   Chrome/Safari ignore ::-webkit-scrollbar the moment `scrollbar-width` is set, so
   the standard property is scoped to engines without the webkit pseudo (Firefox),
   letting the 4px webkit rule govern in Chromium/WebKit. */
@supports not selector(::-webkit-scrollbar) {
    .sequence-chart-wrap,
    .releases-table-wrap,
    .official-ledger-table-wrap,
    .method-table-wrap,
    .ledger-table-wrap {
        scrollbar-width: thin;
        scrollbar-color: var(--line-strong) transparent;
    }
}

.sequence-chart-wrap::-webkit-scrollbar,
.releases-table-wrap::-webkit-scrollbar,
.official-ledger-table-wrap::-webkit-scrollbar,
.method-table-wrap::-webkit-scrollbar,
.ledger-table-wrap::-webkit-scrollbar {
    height: 4px;
    width: 4px;
}

.sequence-chart-wrap::-webkit-scrollbar-track,
.releases-table-wrap::-webkit-scrollbar-track,
.official-ledger-table-wrap::-webkit-scrollbar-track,
.method-table-wrap::-webkit-scrollbar-track,
.ledger-table-wrap::-webkit-scrollbar-track {
    background: transparent;
}

.sequence-chart-wrap::-webkit-scrollbar-thumb,
.releases-table-wrap::-webkit-scrollbar-thumb,
.official-ledger-table-wrap::-webkit-scrollbar-thumb,
.method-table-wrap::-webkit-scrollbar-thumb,
.ledger-table-wrap::-webkit-scrollbar-thumb {
    border-radius: 99px;
    background: var(--line-strong);
}

.sequence-chart-wrap::-webkit-scrollbar-thumb:hover,
.releases-table-wrap::-webkit-scrollbar-thumb:hover,
.official-ledger-table-wrap::-webkit-scrollbar-thumb:hover,
.method-table-wrap::-webkit-scrollbar-thumb:hover,
.ledger-table-wrap::-webkit-scrollbar-thumb:hover {
    background: color-mix(in srgb, var(--accent) 62%, var(--line-strong));
}

.sequence-chart {
    display: block;
    min-width: 760px;
    width: 100%;
    height: auto;
}

.sequence-chart-gridline {
    stroke: var(--line);
    stroke-width: 1;
}

.sequence-chart-axis-label,
.sequence-chart-axis-title {
    fill: var(--muted);
    font-family: var(--mono);
    font-size: 11px;
}

.sequence-chart-axis-title {
    letter-spacing: .05em;
    text-transform: uppercase;
}

.sequence-chart-date-label {
    font-size: 10px;
}

.sequence-bar {
    shape-rendering: geometricPrecision;
}

.sequence-bar--below-m2 {
    fill: var(--seq-below-m2);
}

.sequence-bar--m2 {
    fill: var(--seq-m2);
}

.sequence-bar--m3 {
    fill: var(--seq-m3);
}

.sequence-bar--m4 {
    fill: var(--seq-m4);
}

.sequence-bar--m5 {
    fill: var(--seq-m5);
}

.sequence-bar-partial {
    fill: none;
    stroke: var(--text-sub);
    stroke-width: 1.5;
    stroke-dasharray: 5 4;
}

.sequence-mainshock-guide {
    stroke: var(--old-brass);
    stroke-width: 1.2;
}

.sequence-mainshock-node {
    fill: var(--paper-warm);
    stroke: var(--old-brass);
    stroke-width: 1.5;
}

.sequence-mainshock-label {
    fill: var(--old-brass);
    font-family: var(--mono);
    font-size: 9px;
    font-weight: 600;
    letter-spacing: .08em;
}

.sequence-chart-legend {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem 1rem;
    margin-top: .55rem;
    color: var(--text-sub);
    font-size: .68rem;
}

.sequence-chart-legend span {
    display: inline-flex;
    align-items: center;
    gap: .38rem;
}

.sequence-chart-legend i {
    width: 9px;
    height: 9px;
    border-radius: 2px;
    background: var(--muted);
}

.sequence-chart-legend .below-m2 { background: var(--seq-below-m2); }
.sequence-chart-legend .m2 { background: var(--seq-m2); }
.sequence-chart-legend .m3 { background: var(--seq-m3); }
.sequence-chart-legend .m4 { background: var(--seq-m4); }
.sequence-chart-legend .m5 { background: var(--seq-m5); }
.sequence-chart-legend .anchor {
    background: transparent;
    border: 1px solid var(--old-brass);
}
.sequence-chart-legend .partial {
    background: transparent;
    border: 1px dashed var(--text-sub);
}
.sequence-chart-legend .gap {
    background: color-mix(in srgb, var(--text-sub) 5%, transparent);
    border: 1px dashed color-mix(in srgb, var(--text-sub) 55%, transparent);
}

.sequence-activity-reading {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(240px, .8fr);
    gap: 1rem;
    margin-top: 1rem;
}

.sequence-reading-block {
    padding: .9rem 1rem;
    border-top: 1px solid var(--line);
    color: var(--text-sub);
    font-size: .76rem;
}

.sequence-reading-block strong {
    display: block;
    margin-bottom: .25rem;
    color: var(--text);
    font-size: .74rem;
}

.sequence-blocked-state {
    padding: 1rem 1.1rem;
    border: 1px solid color-mix(in srgb, var(--warn) 52%, var(--line));
    border-radius: var(--plate-radius);
    background: color-mix(in srgb, var(--warn) 8%, transparent);
    color: var(--text);
    line-height: 1.6;
}

.sequence-root[data-state='loading'] #sequence-data-content {
    opacity: .42;
}

.sequence-root[data-state='ready'] #sequence-data-content {
    opacity: 1;
    transition: opacity .35s var(--ease);
}

.releases-root {
    display: grid;
    gap: var(--field-gap);
}

.releases-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(260px, .55fr);
    gap: clamp(1.4rem, 4vw, 4rem);
    align-items: center;
    padding: clamp(1.6rem, 3.2vw, 2.5rem);
    border: 1px solid var(--line);
    border-radius: var(--plate-radius);
    background:
        linear-gradient(120deg, color-mix(in srgb, var(--surface2) 72%, transparent), transparent 64%),
        var(--bg);
}

.releases-title {
    max-width: 820px;
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(1.55rem, 3vw, 2.65rem);
    line-height: 1.16;
    letter-spacing: -.022em;
    text-wrap: balance;
}

.releases-invariant {
    max-width: 820px;
    margin-top: .85rem;
    color: var(--text-sub);
    font-size: .84rem;
    line-height: 1.65;
}

.releases-source-boundary {
    padding-left: clamp(1rem, 2.6vw, 2.2rem);
    border-left: 1px solid var(--line);
}

.releases-final-number {
    font-family: var(--mono);
    font-size: clamp(2.5rem, 6vw, 4.6rem);
    line-height: .9;
    color: var(--accent);
}

.releases-final-label {
    margin-top: .45rem;
    color: var(--text);
    font-family: var(--mono);
    font-size: .65rem;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.releases-source-boundary p {
    margin-top: .7rem;
    color: var(--text-sub);
    font-size: .72rem;
    line-height: 1.6;
}

.release-branch-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.5rem);
    padding: .5rem var(--plate-pad) .9rem;
}

.release-branch {
    min-width: 0;
    padding: .9rem 0 0;
    border-top: 1px solid var(--line-strong);
}

.release-branch-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: .75rem;
}

.release-branch-index {
    color: var(--accent);
    font-family: var(--mono);
    font-size: .58rem;
    letter-spacing: .1em;
}

.release-branch-title {
    margin-top: .22rem;
    font-family: var(--serif);
    font-weight: 500;
    font-size: 1.02rem;
}

.release-branch-rule {
    margin-top: .1rem;
    color: var(--muted);
    font-family: var(--mono);
    font-size: .61rem;
}

.release-branch-share {
    color: var(--text);
    font-family: var(--mono);
    font-size: 1.05rem;
}

.release-branch-track {
    height: 4px;
    margin: 1rem 0;
    overflow: hidden;
    border-radius: 99px;
    background: color-mix(in srgb, var(--muted) 18%, transparent);
}

.release-branch-fill {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: var(--accent2);
}

.release-branch[data-branch='southOffshore'] .release-branch-fill {
    background: var(--rust);
}

.release-branch[data-branch='balutCentral'] .release-branch-fill {
    background: var(--accent);
}

.release-branch-metrics {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: .65rem;
}

.release-branch-metric {
    display: grid;
    gap: .08rem;
    padding-top: .55rem;
    border-top: 1px solid var(--line);
}

.release-branch-metric-label {
    color: var(--muted);
    font-size: .62rem;
}

.release-branch-metric-value {
    color: var(--text);
    font-family: var(--mono);
    font-size: .82rem;
    font-weight: 500;
}

.releases-ledger {
    padding: var(--plate-pad);
}

.releases-ledger-note {
    max-width: 900px;
    margin: -.35rem 0 1rem;
    color: var(--text-sub);
    font-size: .74rem;
    line-height: 1.6;
}

.releases-table-wrap {
    overflow-x: auto;
    overscroll-behavior-inline: contain;
}

.releases-table {
    min-width: 920px;
}

.releases-table td {
    vertical-align: top;
}

.release-magnitude {
    color: var(--accent);
    font-family: var(--mono);
    font-weight: 500;
}

.release-location {
    max-width: 340px;
    color: var(--text-sub);
    font-size: .72rem;
    line-height: 1.45;
}

.release-source-link {
    color: var(--accent2);
    font-family: var(--mono);
    font-size: .65rem;
    text-decoration: none;
    border-bottom: 1px solid color-mix(in srgb, var(--accent2) 45%, transparent);
}

.release-source-link:hover,
.release-source-link:focus-visible {
    color: var(--text);
    border-color: var(--text);
}

.releases-boundary {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: .8rem;
    margin-top: 1rem;
    padding-top: .85rem;
    border-top: 1px solid var(--line);
    color: var(--text-sub);
    font-size: .7rem;
    line-height: 1.5;
}

.releases-boundary strong {
    color: var(--text);
    font-family: var(--mono);
    font-size: .61rem;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.official-ledger-card {
    padding: var(--plate-pad);
}

.official-ledger-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.official-ledger-lede {
    max-width: 780px;
    margin-top: .35rem;
    color: var(--text-sub);
    font-size: .74rem;
    line-height: 1.6;
}

.official-ledger-head-actions {
    flex: 0 0 auto;
    display: grid;
    justify-items: end;
    gap: .55rem;
}

/* Naked form row — the inputs carry their own borders; the container needs no
   box of its own, just a hairline rule to open the control band. */
.official-ledger-filters {
    display: grid;
    grid-template-columns: repeat(4, minmax(145px, 1fr)) auto;
    gap: .65rem;
    align-items: end;
    padding: .9rem 0 .2rem;
    border-top: 1px solid var(--line);
}

.official-ledger-filter {
    display: grid;
    gap: .28rem;
    min-width: 0;
}

.official-ledger-filter span {
    color: var(--muted);
    font-family: var(--mono);
    font-size: .58rem;
    letter-spacing: .07em;
    text-transform: uppercase;
}

.official-ledger-filter input,
.official-ledger-filter select {
    width: 100%;
    min-height: 34px;
    padding: .38rem .5rem;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--paper-warm);
    color: var(--text);
    font-family: var(--mono);
    font-size: .68rem;
}

.official-ledger-filter input:focus,
.official-ledger-filter select:focus {
    outline: 1px solid var(--accent);
    outline-offset: 1px;
}

.official-ledger-reset,
.official-ledger-pagination button {
    min-height: 34px;
    padding: .38rem .72rem;
    border: 1px solid var(--line);
    border-radius: 6px;
    background: var(--surface2);
    color: var(--text-sub);
    font-family: var(--mono);
    font-size: .64rem;
    cursor: pointer;
}

.official-ledger-reset:hover,
.official-ledger-reset:focus-visible,
.official-ledger-pagination button:hover:not(:disabled),
.official-ledger-pagination button:focus-visible:not(:disabled) {
    color: var(--accent);
    border-color: var(--accent);
}

.official-ledger-pagination button:disabled {
    cursor: default;
    opacity: .35;
}

.official-ledger-result-line {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    margin: .85rem 0 .55rem;
    color: var(--text-sub);
    font-family: var(--mono);
    font-size: .62rem;
}

.official-ledger-table-wrap {
    overflow-x: auto;
    overscroll-behavior-inline: contain;
}

.official-ledger-table {
    min-width: 940px;
}

.official-ledger-table td {
    vertical-align: top;
}

.official-ledger-magnitude {
    color: var(--accent);
}

.official-ledger-magnitude.is-strong {
    color: var(--rust);
    font-weight: 600;
}

.official-ledger-branch {
    color: var(--text-sub);
    font-size: .69rem;
    white-space: nowrap;
}

.official-ledger-location {
    max-width: 360px;
    color: var(--text-sub);
    font-size: .7rem;
    line-height: 1.45;
}

.official-ledger-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .75rem;
    margin-top: .85rem;
    color: var(--text-sub);
    font-family: var(--mono);
    font-size: .64rem;
}

.official-ledger-blocked {
    padding: .9rem 1rem;
    border: 1px solid color-mix(in srgb, var(--warn) 52%, var(--line));
    border-radius: var(--plate-radius);
    background: color-mix(in srgb, var(--warn) 8%, transparent);
    color: var(--text);
    font-size: .74rem;
    line-height: 1.6;
}

.archive-root {
    display: grid;
    gap: var(--field-gap);
}

.archive-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(240px, .65fr);
    gap: clamp(1.5rem, 4vw, 4rem);
    align-items: end;
    padding: clamp(1.6rem, 3.2vw, 2.6rem);
    border: 1px solid var(--line);
    border-radius: var(--plate-radius);
    /* Same construction as the other heroes: tint fades out over a var(--bg)
       base. The previous two-stop bg -> surface2 gradient never faded, so the
       far side of the plate stayed permanently lifted off the page ground. */
    background: linear-gradient(135deg, color-mix(in srgb, var(--surface2) 72%, transparent), transparent 58%),
        var(--bg);
}

.archive-title {
    max-width: 900px;
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(1.6rem, 3.2vw, 2.8rem);
    line-height: 1.15;
    letter-spacing: -.025em;
    text-wrap: balance;
}

.archive-hero p {
    max-width: 820px;
    margin-top: .9rem;
    color: var(--text-sub);
    font-size: .78rem;
    line-height: 1.65;
}

.archive-boundary {
    display: grid;
    gap: .5rem;
    padding-left: clamp(1rem, 2.6vw, 2.2rem);
    border-left: 1px solid var(--line);
    color: var(--text-sub);
    font-family: var(--mono);
    font-size: .64rem;
}

.archive-boundary strong {
    margin-bottom: .15rem;
    color: var(--accent2);
    letter-spacing: .08em;
    text-transform: uppercase;
}

/* Vertical menu, not a card grid: borderless rows separated by active whitespace
   alone. Each row is a full-width click target; the affordance comes from the hover
   tint and the arrow, never from a box. `border: 0` and `appearance: none` are
   load-bearing — a <button> otherwise paints native chrome on every unset side. */
.archive-grid {
    display: block;
}

.archive-card {
    position: relative;
    display: block;
    width: 100%;
    padding: 1.15rem clamp(2.4rem, 5vw, 3rem) 1.15rem var(--plate-pad);
    border: 0;
    border-radius: 6px;
    background: none;
    color: var(--text);
    font: inherit;
    text-align: left;
    text-decoration: none;
    cursor: pointer;
    appearance: none;
    transition: background-color .18s var(--ease), padding-left .18s var(--ease);
}

.archive-card::after {
    content: '\2192';
    position: absolute;
    top: 50%;
    right: var(--plate-pad);
    transform: translate(0, -50%);
    color: var(--muted);
    font-family: var(--mono);
    font-size: .82rem;
    transition: transform .18s var(--ease), color .18s var(--ease);
}

.archive-card:hover,
.archive-card:focus-visible {
    background-color: color-mix(in srgb, var(--surface2) 68%, transparent);
    padding-left: calc(var(--plate-pad) + .3rem);
    outline: none;
}

.archive-card:focus-visible {
    outline: 1px solid var(--accent);
    outline-offset: -2px;
}

.archive-card:hover::after,
.archive-card:focus-visible::after {
    color: var(--accent);
    transform: translate(4px, -50%);
}

.archive-card > span:first-child {
    display: block;
    margin-bottom: .3rem;
    color: var(--accent);
    font-family: var(--mono);
    font-size: .58rem;
    letter-spacing: .1em;
    text-transform: uppercase;
}

.archive-card > strong {
    display: block;
    font-family: var(--serif);
    font-size: 1.08rem;
    font-weight: 500;
    transition: color .18s var(--ease);
}

.archive-card:hover > strong,
.archive-card:focus-visible > strong {
    color: var(--accent);
}

.archive-card > .archive-card-copy {
    display: block;
    max-width: 640px;
    margin-top: .3rem;
    color: var(--text-sub);
    font-size: .74rem;
    line-height: 1.55;
}

/* Current-context preface for preserved artifacts: the artifact text below stays
   exactly as written; this ruled note updates only how it should be read. */
.archive-reading-context {
    max-width: 900px;
    padding: .8rem var(--plate-pad) 0;
    border-top: 1px solid var(--line);
    color: var(--text-sub);
    font-size: .74rem;
    line-height: 1.6;
}

.archive-reading-context strong {
    display: block;
    margin-bottom: .12rem;
    color: var(--accent2);
    font-family: var(--mono);
    font-size: .62rem;
    font-weight: 500;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.archive-claim-ceiling p {
    margin-top: .7rem;
    color: var(--text-sub);
    font-size: .73rem;
    line-height: 1.6;
}

.legacy-panel {
    display: none;
    gap: 1rem;
}

.legacy-panel.active {
    display: grid;
}

.legacy-surface-boundary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .85rem 1rem;
    border: 1px solid color-mix(in srgb, var(--warn) 45%, var(--line));
    border-radius: var(--plate-radius);
    background: color-mix(in srgb, var(--warn) 7%, var(--surface));
}

.legacy-surface-boundary > div {
    display: grid;
    gap: .25rem;
}

.legacy-surface-boundary span {
    color: var(--warn);
    font-family: var(--mono);
    font-size: .57rem;
    letter-spacing: .09em;
    text-transform: uppercase;
}

.legacy-surface-boundary strong {
    max-width: 950px;
    font-size: .72rem;
    font-weight: 500;
    line-height: 1.5;
}

/* Return control, in the same grammar as the archive rows: an arrow that slides —
   there, → travels into an artifact; here, ← comes back out. Hairline underline
   rather than a box, matching the download links. `border: 0` and `appearance: none`
   are load-bearing: a <button> paints native chrome on every side left unset. */
.legacy-surface-boundary button {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    min-height: 32px;
    padding: .3rem .1rem;
    border: 0;
    border-bottom: 1px solid var(--line-strong);
    border-radius: 0;
    background: none;
    color: var(--text-sub);
    font-family: var(--mono);
    font-size: .58rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    cursor: pointer;
    appearance: none;
    transition: color .18s var(--ease), border-color .18s var(--ease);
}

.legacy-surface-boundary button::before {
    content: '\2190';
    font-size: .74rem;
    line-height: 1;
    transition: transform .18s var(--ease);
}

.legacy-surface-boundary button:hover,
.legacy-surface-boundary button:focus-visible {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.legacy-surface-boundary button:hover::before,
.legacy-surface-boundary button:focus-visible::before {
    transform: translateX(-3px);
}

.legacy-surface-boundary button:focus-visible {
    outline: 1px solid var(--accent);
    outline-offset: 5px;
}

.legacy-surface-boundary-critical {
    border-color: color-mix(in srgb, var(--danger, #b56b61) 55%, var(--line));
}

.method-root {
    display: grid;
    gap: var(--field-gap);
}

.method-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(250px, .6fr);
    gap: clamp(1.5rem, 4vw, 4rem);
    align-items: center;
    padding: clamp(1.6rem, 3.2vw, 2.6rem);
    border: 1px solid var(--line);
    border-radius: var(--plate-radius);
    background:
        linear-gradient(120deg, color-mix(in srgb, var(--surface2) 70%, transparent), transparent 66%),
        var(--bg);
}

.method-title {
    max-width: 820px;
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(1.6rem, 3.2vw, 2.8rem);
    line-height: 1.15;
    letter-spacing: -.025em;
    text-wrap: balance;
}

.method-verdict {
    margin-top: .8rem;
    color: var(--accent2);
    font-family: var(--mono);
    font-size: .7rem;
    letter-spacing: .03em;
}

.method-equation {
    padding-left: clamp(1rem, 2.6vw, 2.2rem);
    border-left: 1px solid var(--line);
}

.method-equation-label,
.method-metric > span,
.method-table-note {
    color: var(--muted);
    font-family: var(--mono);
    font-size: .59rem;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.method-equation-value {
    margin-top: .35rem;
    font-family: var(--mono);
    font-size: clamp(1.2rem, 2.5vw, 1.8rem);
}

.method-equation-result {
    color: var(--accent);
    font-family: var(--mono);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    line-height: .95;
}

.method-equation p {
    margin-top: .65rem;
    color: var(--text-sub);
    font-size: .71rem;
    line-height: 1.55;
}

.method-metrics {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.5rem);
    padding: .5rem var(--plate-pad) .9rem;
}

.method-metric {
    padding: .8rem 0 0;
    border-top: 1px solid var(--line);
}

.method-metric strong {
    display: block;
    margin-top: .3rem;
    font-family: var(--mono);
    font-size: clamp(1.15rem, 2.5vw, 1.65rem);
    font-weight: 500;
}

.method-metric p {
    margin-top: .35rem;
    color: var(--text-sub);
    font-size: .68rem;
    line-height: 1.5;
}

.method-grid,
.method-boundaries {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(1rem, 2.4vw, 1.9rem);
}

.method-explanation ol {
    display: grid;
    gap: .7rem;
    margin: .8rem 0 0 1.2rem;
    color: var(--text-sub);
    font-size: .74rem;
    line-height: 1.6;
}

.method-decision p,
.method-claim-ceiling p {
    margin-top: .8rem;
    color: var(--text-sub);
    font-size: .76rem;
    line-height: 1.65;
}

.method-decision-line {
    display: grid;
    gap: .25rem;
    margin-top: 1rem;
    padding-top: .8rem;
    border-top: 1px solid var(--line);
}

.method-decision-line strong {
    color: var(--accent2);
    font-family: var(--mono);
    font-size: .6rem;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.method-decision-line span {
    font-family: var(--serif);
    font-size: .95rem;
}

.method-table-card {
    padding: var(--plate-pad);
}

.method-table-wrap {
    overflow-x: auto;
    overscroll-behavior-inline: contain;
}

.method-table {
    min-width: 900px;
}

.method-original-table {
    min-width: 780px;
}

.method-table td {
    vertical-align: top;
}

.method-reading {
    max-width: 300px;
    color: var(--text-sub);
    font-size: .68rem;
    line-height: 1.45;
}

.method-result {
    font-family: var(--mono);
    font-size: .63rem;
    text-transform: capitalize;
}

.method-result[data-result='inside tolerance'] {
    color: var(--accent2);
}

.method-result[data-result='outside tolerance'] {
    color: var(--warn);
}

.method-result[data-result='excluded sub-pulse'] {
    color: var(--muted);
}

.method-boundaries ul {
    display: grid;
    gap: .55rem;
    margin: .75rem 0 0 1rem;
    color: var(--text-sub);
    font-size: .72rem;
    line-height: 1.55;
}

.method-claim-ceiling {
    border-color: color-mix(in srgb, var(--accent) 38%, var(--line));
}

@media (max-width: 1080px) {
    .official-ledger-filters {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 860px) {
    .sequence-hero,
    .method-hero,
    .archive-hero {
        grid-template-columns: 1fr;
    }

    .method-equation,
    .archive-boundary {
        padding: 1rem 0 0;
        border-left: 0;
        border-top: 1px solid var(--line);
    }

    .method-metrics {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .method-grid,
    .method-boundaries {
        grid-template-columns: 1fr;
    }

    .sequence-hero {
        grid-template-columns: 1fr;
    }

    .sequence-capture-register {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        padding: 1rem 0 0;
        border-left: 0;
        border-top: 1px solid var(--line);
    }

    .sequence-status {
        grid-column: 1 / -1;
    }

    .sequence-boundary-strip,
    .sequence-activity-reading {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    .sequence-metrics {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .sequence-capture-register {
        grid-template-columns: 1fr;
    }

    .sequence-card-head {
        flex-direction: column;
    }
}

@media (max-width: 860px) {
    .releases-hero {
        grid-template-columns: 1fr;
    }

    .releases-source-boundary {
        padding: 1rem 0 0;
        border-left: 0;
        border-top: 1px solid var(--line);
    }

    .release-branch-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 620px) {
    .releases-boundary {
        grid-template-columns: 1fr;
    }

    .official-ledger-head,
    .official-ledger-result-line {
        flex-direction: column;
    }

    .official-ledger-head-actions {
        justify-items: start;
    }

    .official-ledger-filters,
    .method-metrics {
        grid-template-columns: 1fr;
    }

    .legacy-surface-boundary {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (prefers-reduced-motion: reduce) {
    .sequence-root[data-state='ready'] #sequence-data-content {
        transition: none;
    }
}