/* Components */

/* Sticky Nav */
@supports (backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px)) {
    .sticky-nav {
        position: sticky;
        top: 0;
        z-index: 100;
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        background-color: var(--nav-backdrop);
        border-block-end: 4px solid var(--accent-navy);
        padding-block: var(--space-sm);
    }
}

@supports not ((backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px))) {
    .sticky-nav {
        position: sticky;
        top: 0;
        z-index: 100;
        background-color: var(--bg-parchment);
        border-block-end: 4px solid var(--accent-navy);
        padding-block: var(--space-sm);
    }
}

.sticky-nav {
    box-shadow: 0 0.22rem 0 var(--shadow-nav);
}

.sticky-nav::after {
    content: "";
    position: absolute;
    inset-inline: 0;
    inset-block-end: -4px;
    block-size: 1px;
    background-color: var(--accent-navy);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: clamp(0.8rem, 2vw, var(--space-lg));
}

.nav-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.55em;
    font-family: var(--font-transit);
    font-size: var(--text-xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    text-decoration: none;
    color: var(--accent-navy);
    text-transform: uppercase;
}

.nav-links a {
    font-family: var(--font-transit);
    font-size: var(--text-sm);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    position: relative;
    padding-block: 0.6rem;
    padding-inline: 0;
}

.nav-links a::after {
    content: "";
    position: absolute;
    inset-block-end: 0.32rem;
    inset-inline-start: 0;
    inline-size: 0;
    block-size: 3px;
    background-color: var(--accent-sage);
    transition: inline-size var(--transition-base);
}

.nav-links a:hover::after {
    inline-size: 100%;
}

/* Flat Graphic Primitives */
.motif {
    --motif-size: clamp(4rem, 12vw, 8rem);
    --motif-color: var(--accent-cyan);
    --motif-opacity: 0.42;
    position: relative;
    display: block;
    inline-size: var(--motif-size);
    aspect-ratio: 1;
    color: var(--motif-color);
    opacity: var(--motif-opacity);
    pointer-events: none;
    flex: none;
}

.motif::before,
.motif::after {
    content: "";
    position: absolute;
    pointer-events: none;
}

.motif--benzene::before {
    inset: 7%;
    border: 0.16rem solid currentColor;
    background-color: color-mix(in srgb, currentColor 6%, transparent);
    clip-path: polygon(25% 4%, 75% 4%, 100% 50%, 75% 96%, 25% 96%, 0 50%);
    box-shadow: 0.24rem 0.24rem 0 var(--shadow-chemdraw);
}

.motif--benzene::after {
    inset: 26%;
    background:
        linear-gradient(30deg, transparent 45%, currentColor 46% 53%, transparent 54%),
        linear-gradient(150deg, transparent 45%, currentColor 46% 53%, transparent 54%),
        linear-gradient(90deg, transparent 44%, currentColor 45% 52%, transparent 53%);
    clip-path: polygon(25% 4%, 75% 4%, 100% 50%, 75% 96%, 25% 96%, 0 50%);
}

.motif--reaction-arrow {
    --motif-size: clamp(5rem, 18vw, 12rem);
    inline-size: var(--motif-size);
    block-size: 1rem;
    aspect-ratio: auto;
}

.motif--reaction-arrow::before {
    inset-block-start: calc(50% - 0.08rem);
    inset-inline-start: 0;
    inline-size: calc(100% - 0.95rem);
    block-size: 0.16rem;
    background: linear-gradient(90deg, currentColor, var(--accent-mustard));
}

.motif--reaction-arrow::after {
    inset-block-start: 0;
    inset-inline-end: 0;
    inline-size: 1rem;
    block-size: 1rem;
    background-color: var(--accent-mustard);
    clip-path: polygon(0 0, 100% 50%, 0 100%, 24% 50%);
}

.motif--data-grid {
    --motif-size: clamp(6rem, 20vw, 14rem);
    aspect-ratio: 5 / 3;
    border: 1px solid color-mix(in srgb, currentColor 55%, transparent);
    background:
        linear-gradient(currentColor 1px, transparent 1px),
        linear-gradient(90deg, currentColor 1px, transparent 1px),
        color-mix(in srgb, currentColor 5%, transparent);
    background-size: 0.8rem 0.8rem;
}

.motif--data-grid::before {
    inset-block-start: -1px;
    inset-inline: -1px;
    block-size: 0.28rem;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-mustard), var(--accent-red));
}

.lab-label,
.section-kicker,
.callout-title {
    display: flex;
    align-items: center;
    gap: 0.45em;
    inline-size: fit-content;
    max-inline-size: 100%;
}

.lab-label::before,
.section-kicker::before,
.callout-title::before {
    content: "";
    inline-size: 0.65em;
    block-size: 0.65em;
    border: 2px solid currentColor;
    background:
        linear-gradient(135deg, transparent 0 48%, currentColor 49% 55%, transparent 56% 100%);
    flex: none;
}

.compound-annotation {
    position: relative;
    display: block;
    padding-block: var(--space-sm);
    padding-inline: var(--space-md);
    border: 1px solid var(--rule-strong);
    border-inline-start: 0.35rem solid var(--accent-red);
    background-color: var(--surface-paper);
    box-shadow: 0.18rem 0.18rem 0 var(--shadow-chemdraw);
}

.compound-annotation::before {
    content: "";
    position: absolute;
    inset-block-start: -0.42rem;
    inset-inline-start: var(--space-md);
    inline-size: 2.7rem;
    block-size: 0.7rem;
    border: 1px solid var(--rule-strong);
    background:
        linear-gradient(90deg, currentColor 0 18%, transparent 18% 32%, currentColor 32% 50%, transparent 50% 64%, currentColor 64% 82%, transparent 82%),
        var(--surface-paper);
    color: var(--accent-cyan);
}

/* Timeline */
.timeline {
    border-inline-start: 5px solid var(--accent-cyan);
    padding-inline-start: 2rem;
    margin-inline-start: 0.55rem;
    position: relative;
    margin-block-start: var(--space-lg);
}

.timeline-entry {
    position: relative;
    padding-block-end: var(--space-lg);
}

.timeline-entry::before {
    content: "";
    position: absolute;
    inset-inline-start: calc(-2rem - 0.55rem);
    inset-block-start: 0.35rem;
    inline-size: 1rem;
    block-size: 1rem;
    background-color: var(--surface-paper);
    border: 3px solid var(--accent-navy);
    border-radius: 0;
    transform: rotate(45deg);
}

.timeline-entry::after {
    content: "";
    position: absolute;
    inset-inline-start: calc(-1rem - 0.55rem);
    inset-block-start: 0.78rem;
    inline-size: 1.15rem;
    block-size: 3px;
    background-color: var(--accent-sage);
    clip-path: polygon(0 0, calc(100% - 0.28rem) 0, 100% 50%, calc(100% - 0.28rem) 100%, 0 100%);
}

.timeline-entry time {
    font-family: var(--font-transit);
    color: var(--accent-sage);
    font-size: var(--text-sm);
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    display: block;
}

.timeline-entry:last-child {
    padding-block-end: 0;
}

/* Content Cards */
.card {
    position: relative;
    isolation: isolate;
    border: 1px solid var(--border-subtle);
    padding-block: var(--space-lg);
    padding-inline: var(--space-lg);
    background-color: var(--surface-paper);
    border-radius: var(--radius-md);
    box-shadow: 0 0.18rem 0.75rem var(--shadow-subtle);
    transition: transform var(--transition-base),
                box-shadow var(--transition-base),
                background-color var(--transition-fast);
    text-decoration: none;
    display: block;
    color: inherit;
}

.card::after {
    content: none;
}

.card > * {
    position: relative;
    z-index: 1;
}

.card:hover {
    box-shadow: 0 0.42rem 1.15rem var(--shadow-hover);
    transform: translateY(-1px);
}

.card:focus-within,
.card:focus-visible {
    box-shadow: 0 0 0 3px var(--focus-ring), 0 0.32rem 1rem var(--shadow-hover);
}

.card-title {
    font-family: var(--font-transit);
    font-size: var(--text-xl);
    font-weight: 600;
    margin-block: 0 var(--space-xs);
    margin-inline: 0;
    color: var(--accent-navy);
}

.card-meta {
    font-family: var(--font-transit);
    font-size: var(--text-sm);
    color: var(--accent-sage);
    margin-block-end: var(--space-sm);
}

.card-summary {
    font-size: var(--text-sm);
    line-height: 1.5;
    margin-block-end: var(--space-sm);
}

.card-kicker,
.panel-kicker,
.section-kicker,
.card-statline,
.card-trace {
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.card-kicker,
.panel-kicker,
.section-kicker {
    color: var(--accent-sage);
    margin-block-end: var(--space-sm);
}

.card-meta-row,
.card-footer-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
}

.card-footer-row {
    margin-block-start: var(--space-md);
}

.card-statline,
.card-trace {
    color: var(--text-sage);
}

.card--feature,
.card--postcard,
.card--projectcard,
.card--timeline {
    position: relative;
    overflow: hidden;
}

.card--feature::before,
.card--postcard::before,
.card--projectcard::before,
.card--timeline::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--surface-lab) 36%, transparent), transparent 58%);
    pointer-events: none;
    z-index: 0;
}

.card--beaker-shelf {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-lg);
    opacity: 0.82;
    background-color: color-mix(in srgb, var(--bg-parchment) 96%, var(--accent-mustard) 4%);
}

.card--beaker-shelf:hover {
    opacity: 1;
}

.beaker-construction {
    position: relative;
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    border: 2px dashed var(--accent-mustard);
    border-radius: var(--radius-md);
    background:
        repeating-linear-gradient(
            -45deg,
            color-mix(in srgb, var(--accent-mustard) 14%, transparent),
            color-mix(in srgb, var(--accent-mustard) 14%, transparent) 12px,
            transparent 12px,
            transparent 24px
        ),
        color-mix(in srgb, var(--bg-parchment) 94%, var(--accent-navy) 6%);
}

.beaker-construction .hero-lede,
.beaker-construction .hero-subtitle {
    margin-inline: auto;
}

.construction-marquee {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.construction-roadblocks {
    width: min(100%, 34rem);
    height: auto;
    overflow: visible;
}

.roadblock__board {
    fill: var(--accent-mustard);
    stroke: var(--accent-navy);
    stroke-width: 8;
}

.roadblock__stripe {
    fill: none;
    stroke: var(--accent-navy);
    stroke-linecap: round;
    stroke-width: 12;
}

.roadblock__leg,
.roadblock__foot {
    fill: color-mix(in srgb, var(--accent-navy) 88%, black 12%);
}

.beaker-shelf {
    text-align: center;
}

.beaker-shelf-grid {
    grid-template-columns: minmax(0, min(100%, 34rem));
    justify-content: center;
}

.beaker-shelf-grid .card {
    text-align: left;
}

.beaker-empty-copy {
    margin-inline: auto;
}

/* Homepage Hero */
.home-shell {
    position: relative;
    z-index: 0;
    isolation: isolate;
}

.home-shell::before {
    content: "";
    position: absolute;
    z-index: -1;
    inset-block-start: calc(-1 * clamp(5rem, 10vw, 9rem));
    inset-inline-start: 50%;
    inline-size: min(100vw, calc(100% + clamp(4rem, 16vw, 14rem)));
    block-size: clamp(42rem, 78vw, 72rem);
    transform: translateX(-50%);
    pointer-events: none;
    background:
        linear-gradient(90deg, transparent 0%, var(--hero-gradient) 22%, color-mix(in srgb, var(--accent-mustard) 8%, transparent) 48%, var(--hero-gradient) 72%, transparent 100%),
        radial-gradient(ellipse at 22% 18%, color-mix(in srgb, var(--accent-cyan) 14%, transparent) 0%, transparent 62%),
        radial-gradient(ellipse at 72% 28%, color-mix(in srgb, var(--accent-navy) 10%, transparent) 0%, transparent 58%),
        radial-gradient(ellipse at 50% 54%, var(--hero-gradient) 0%, transparent 70%);
    -webkit-mask-image:
        linear-gradient(to bottom, transparent 0%, black 8%, black 34%, rgba(0, 0, 0, 0.78) 56%, rgba(0, 0, 0, 0.38) 74%, transparent 100%),
        linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
    -webkit-mask-composite: source-in;
    mask-image:
        linear-gradient(to bottom, transparent 0%, black 8%, black 34%, rgba(0, 0, 0, 0.78) 56%, rgba(0, 0, 0, 0.38) 74%, transparent 100%),
        linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
    mask-composite: intersect;
}

.hero {
    text-align: center;
    padding-block: var(--space-xl);
}

.hero--composite,
.hero--section {
    text-align: left;
}

.hero--section {
    text-align: center;
}

.hero--composite {
    display: grid;
    gap: var(--space-lg);
    align-items: start;
}

.hero-panel-stack {
    display: grid;
    gap: var(--space-md);
}

.hero-copy {
    position: relative;
}

.hero-copy--home {
    isolation: isolate;
    text-align: center;
    padding: clamp(1.5rem, 4vw, var(--space-xl));
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--surface-lab) 72%, transparent), transparent 52%),
        var(--surface-paper);
    box-shadow: 0 0.28rem 1rem var(--shadow-subtle);
    overflow: hidden;
}

.hero-copy--home::after {
    content: "";
    position: absolute;
    inset-inline: auto 0;
    inset-block-end: 0;
    inline-size: min(52%, 24rem);
    block-size: 40%;
    background:
        linear-gradient(var(--bg-rule-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-rule-color) 1px, transparent 1px);
    background-size: 0.85rem 0.85rem;
    opacity: 0.78;
    pointer-events: none;
    z-index: 0;
}

.hero-motif {
    --motif-size: clamp(7rem, 18vw, 13rem);
    --motif-color: var(--accent-cyan);
    --motif-opacity: 0.34;
    position: absolute;
    inset-block-start: clamp(1.25rem, 4vw, 2.75rem);
    inset-inline-end: clamp(1rem, 4vw, 2.5rem);
    z-index: 0;
}

.hero-copy--home > :not(.hero-motif):not(.hero-decorations) {
    position: relative;
    z-index: 1;
}

.hero-copy--home .hero-lede {
    max-width: 35rem;
    text-align: justify;
    hyphens: auto;
}

.margin-decoration-layer {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.sticky-nav,
main,
.site-footer {
    position: relative;
    z-index: 1;
}

.hero-decorations {
    position: absolute;
    inset: calc(-1 * var(--space-lg));
    pointer-events: none;
    z-index: -1;
}

.bond-decoration {
    position: absolute;
    width: clamp(90px, 12vw, 180px);
    opacity: 0.32;
    filter: saturate(0.75);
}

.bond-decoration--hero-left,
.bond-decoration--hero {
    top: 0;
    left: 0;
}

.bond-decoration--hero-right {
    right: 0;
    bottom: 10%;
}

.bond-decoration--margin-left,
.bond-decoration--margin {
    left: max(1rem, calc((100vw - var(--max-width-hub)) / 4));
    top: 22vh;
}

.bond-decoration--margin-right {
    right: max(1rem, calc((100vw - var(--max-width-hub)) / 4));
    top: 58vh;
}

.hero-kicker,
.hero-lede {
    max-width: 42rem;
}

.hero-copy--home .hero-kicker,
.hero-copy--home .hero-lede,
.hero--section .hero-kicker,
.hero--section .hero-lede {
    margin-inline: auto;
}

.hero-copy--home .hero-lede {
    margin-inline: auto;
}

.hero-kicker {
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-sage);
    margin-block-end: var(--space-sm);
}

.hero-title {
    font-family: var(--font-transit);
    font-size: var(--text-5xl);
    font-weight: 700;
    letter-spacing: -0.045em;
    color: var(--rule-strong);
    margin-block-end: var(--space-md);
    line-height: 1;
}

@media (max-width: 899px) {
    .hero-title {
        font-size: var(--text-4xl);
    }
}

.hero-rule {
    inline-size: min(18rem, 55vw);
    block-size: 5px;
    background-color: var(--accent-navy);
    margin-block: var(--space-md);
    margin-inline: auto;
    position: relative;
}

.hero-rule::after {
    content: "";
    position: absolute;
    inset-block-start: 100%;
    inset-inline-start: 50%;
    inline-size: 1rem;
    block-size: 0.65rem;
    background-color: var(--accent-navy);
    clip-path: polygon(0 0, 100% 0, 50% 100%);
    transform: translateX(-50%);
}

.hero-subtitle {
    font-family: var(--font-transit);
    font-size: var(--text-lg);
    color: var(--text-sage);
    letter-spacing: 0.04em;
    margin-block-start: var(--space-md);
}

.hero-subtitle--left {
    margin-inline: 0;
}

.hero--section .hero-subtitle--left {
    margin-inline: auto;
    max-width: 52rem;
}

.hero-rule--left {
    margin-inline: 0;
}

.hero-copy--home .hero-subtitle--left,
.hero-copy--home .hero-rule--left {
    margin-inline: auto;
}

.hero--section .hero-rule--left {
    margin-inline: auto;
}

.hero-lede {
    font-size: var(--text-lg);
    line-height: 1.5;
    margin-block-start: var(--space-md);
}

.hero--composite .hero-lede {
    font-size: clamp(1.65rem, 2.3vw, 2rem);
    line-height: 1.35;
}

.hero--composite .hero-copy--home .hero-lede {
    font-size: clamp(1.08rem, 1.35vw, 1.25rem);
    line-height: 1.65;
    text-align: justify;
}

/* Tight coupling: hero to pathways. Do NOT increase this gap — the design is intentionally dense. */
.home-pathways {
    margin-block-start: var(--space-md);
}

.home-pathways__header {
    padding-block: 0 var(--space-sm);
    padding-inline: var(--space-sm);
    border-block-end: 1px solid var(--border-subtle);
}

.home-pathways__header .section-kicker,
.home-pathways__header .section-title,
.home-pathways__header .section-aside {
    margin-block-end: 0;
}

.home-pathways__beaker {
    margin-block-start: var(--space-lg);
}

.signal-panel,
.section-shell {
    position: relative;
    isolation: isolate;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    background-color: var(--surface-paper);
    box-shadow: 0 0.2rem 0.85rem var(--shadow-subtle);
}

.signal-panel::after,
.section-shell::after {
    content: none;
}

.activity-panel::after,
.section-updates::after {
    content: none;
}

.signal-panel {
    padding: var(--space-lg);
}

.glance-panel {
    padding: var(--space-sm);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    background-color: color-mix(in srgb, var(--surface-paper) 92%, var(--surface-lab) 8%);
    box-shadow: 0 0.18rem 0.75rem var(--shadow-subtle);
}

.activity-panel {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    box-shadow: 0 0.2rem 0.85rem var(--shadow-subtle);
}

.activity-panel__heading {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    padding-block: var(--space-md);
    padding-inline: var(--space-lg);
    background-color: var(--accent-navy);
    border-block-end: 1px solid var(--border-subtle);
}

.activity-panel__heading::before,
.section-updates__heading::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(currentColor 1px, transparent 1px),
        linear-gradient(90deg, currentColor 1px, transparent 1px);
    background-size: 0.8rem 0.8rem;
    opacity: 0.16;
    pointer-events: none;
    z-index: 0;
}

.activity-panel__heading > *,
.section-updates__heading > * {
    position: relative;
    z-index: 1;
}

.activity-panel__heading .section-title {
    color: var(--bg-parchment);
    font-size: var(--text-xl);
    margin: 0;
}

.activity-panel__body {
    padding-block: var(--space-md);
    padding-inline: var(--space-lg);
    background-color: var(--surface-paper);
}

.section-shell {
    padding: var(--space-lg);
}

.section-header {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    display: flex;
    justify-content: space-between;
    gap: var(--space-lg);
    align-items: end;
    padding-block-end: var(--space-md);
    border-block-end: 1px solid var(--border-subtle);
}

.section-header::after {
    content: "";
    position: absolute;
    inset-inline-end: 0;
    inset-block-end: calc(var(--space-sm) * -1);
    inline-size: clamp(4.5rem, 18%, 8rem);
    block-size: 1px;
    background-color: var(--border-subtle);
    opacity: 1;
    pointer-events: none;
    z-index: 0;
}

.section-header > * {
    position: relative;
    z-index: 1;
}

.section-header--compact {
    margin-block-end: var(--space-md);
}

.section-title {
    font-family: var(--font-transit);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--accent-navy);
}

.section-summary {
    margin-block-start: var(--space-sm);
    max-width: 44rem;
}

.section-aside {
    font-family: var(--font-transit);
    font-size: var(--text-sm);
    color: var(--text-sage);
    white-space: nowrap;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--space-sm);
    margin-block-start: var(--space-lg);
}

.stats-grid--tight {
    margin-block-start: 0;
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-chip {
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding-block: 0.85rem;
    padding-inline: 0.9rem;
    background-color: var(--surface-paper);
    box-shadow: 0.18rem 0.18rem 0 var(--shadow-subtle);
}

.stat-chip-value,
.stat-chip-label {
    display: block;
}

.stat-chip-value {
    font-family: var(--font-transit);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--accent-navy);
    line-height: 1;
}

.stat-chip-label {
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-sage);
    margin-block-start: var(--space-xs);
}

.activity-list {
    display: grid;
    gap: var(--space-sm);
}

.activity-item {
    display: block;
    text-decoration: none;
    color: inherit;
    border-block-start: 1px solid var(--border-subtle);
    padding-block-start: var(--space-sm);
}

.activity-item:first-child {
    border-block-start: none;
    padding-block-start: 0;
}

.activity-meta {
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    color: var(--text-sage);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.activity-title {
    font-family: var(--font-transit);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--accent-navy);
    margin-block-start: var(--space-xs);
}

.activity-summary {
    font-size: var(--text-sm);
    line-height: 1.5;
    margin-block-start: var(--space-xs);
}

.section-updates {
    position: relative;
    isolation: isolate;
    display: grid;
    grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.6fr);
    gap: var(--space-md);
    align-items: stretch;
    margin-block: 0 var(--space-md);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    background-color: var(--surface-paper);
    box-shadow: 0 0.2rem 0.85rem var(--shadow-subtle);
}

.section-updates__heading {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    padding-block: var(--space-md);
    padding-inline: var(--space-lg);
    background-color: var(--accent-navy);
    color: var(--bg-parchment);
    border-inline-end: 1px solid var(--border-subtle);
}

.section-updates__heading .section-kicker,
.section-updates__heading .section-title,
.section-updates__heading .section-summary {
    color: inherit;
}

.section-updates__heading .section-title {
    font-size: var(--text-xl);
}

.section-updates__heading .section-summary {
    margin-block-end: 0;
    opacity: 0.82;
}

.section-updates__list {
    display: grid;
    gap: var(--space-sm);
    padding: var(--space-md);
    background-color: var(--surface-paper);
}

.section-update {
    display: grid;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    background-color: color-mix(in srgb, var(--surface-lab) 52%, var(--surface-paper) 48%);
    text-decoration: none;
}

.section-update__meta {
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    color: var(--text-sage);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.section-update__title {
    font-family: var(--font-transit);
    font-weight: 600;
    color: var(--accent-navy);
}

.section-update:hover {
    background-color: color-mix(in srgb, var(--accent-cyan) 12%, var(--surface-paper) 88%);
}

.section-update:focus-visible,
.card--beaker-shelf:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--focus-ring), 0.45rem 0.45rem 0 var(--shadow-hover);
}

[data-theme="dark"] .activity-panel__heading,
[data-theme="dark"] .section-updates__heading {
    background-color: color-mix(in srgb, var(--bg-parchment) 82%, var(--accent-navy) 18%);
    color: var(--text-academic);
}

[data-theme="dark"] .activity-panel__heading {
    border-block-end: 1px solid var(--border-subtle);
}

[data-theme="dark"] .activity-panel__heading .section-title,
[data-theme="dark"] .section-updates__heading .section-title {
    color: var(--text-academic);
}

[data-theme="dark"] .section-updates__list {
    background-color: color-mix(in srgb, var(--bg-parchment) 84%, var(--accent-sage) 16%);
}

/* Tags */
.tag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    isolation: isolate;
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    font-weight: 700;
    line-height: 1.1;
    min-block-size: 2rem;
    padding-block: 0.38em;
    padding-inline: 0.95em;
    color: var(--text-sage);
    text-transform: lowercase;
    text-decoration: none;
    margin-inline-end: var(--space-xs);
    margin-block-end: var(--space-xs);
    position: relative;
    background: transparent;
    border: none;
    border-radius: 0;
    white-space: nowrap;
}

.tag::before {
    content: "";
    position: absolute;
    inset: 0;
    background-color: transparent;
    clip-path: polygon(9% 50%, 19% 8%, 81% 8%, 91% 50%, 81% 92%, 19% 92%);
    border: none;
    box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--accent-sage) 92%, var(--rule-strong) 8%);
    transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
    z-index: -1;
}

.tag:hover::before {
    background-color: var(--accent-navy);
    box-shadow: inset 0 0 0 2px var(--accent-navy), inset 0 -0.22rem 0 var(--accent-mustard);
}

.tag:hover,
.tag:focus-visible {
    color: var(--bg-parchment);
}

.tag:focus-visible::before {
    background-color: var(--accent-navy);
    box-shadow: inset 0 0 0 2px var(--accent-navy), 0 0 0 3px var(--focus-ring);
}

/* Status Badges */
.badge {
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-block: 0.28em;
    padding-inline: 0.72em;
    border-radius: var(--radius-sm);
    display: inline-block;
    border: 1px solid currentColor;
}

.badge--active {
    background-color: var(--accent-sage);
    color: var(--bg-parchment);
}

.badge--archived {
    background-color: var(--border-subtle);
    color: var(--text-academic);
}

.badge--wip {
    background-color: var(--accent-mustard);
    color: var(--text-academic);
}

@media (min-width: 900px) {
    .hero--composite {
        grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.95fr);
    }
}

@media (max-width: 899px) {
    .home-shell::before {
        inset-block-start: calc(-1 * clamp(4rem, 18vw, 7rem));
        block-size: clamp(52rem, 150vw, 78rem);
    }

    .hero--composite {
        padding-block: var(--space-lg) var(--space-md);
        padding-inline: 0;
        gap: var(--space-md);
        margin-block-end: var(--space-lg);
    }

    .hero-copy--home {
        padding-block: var(--space-lg);
        padding-inline: var(--space-md);
        border: 1px solid var(--border-subtle);
        border-radius: var(--radius-md);
        background:
            linear-gradient(135deg, color-mix(in srgb, var(--surface-lab) 72%, transparent), transparent 52%),
            var(--surface-paper);
        box-shadow: 0 0.22rem 0.85rem var(--shadow-subtle);
    }

    .hero-copy--home .hero-kicker,
    .hero-copy--home .hero-subtitle--left,
    .hero-copy--home .hero-lede {
        max-width: none;
    }

    .hero-copy--home .hero-lede {
        font-size: var(--text-base);
        line-height: 1.6;
    }

    .hero-copy--home .hero-title {
        font-size: clamp(2.35rem, 13vw, var(--text-4xl));
        letter-spacing: -0.055em;
    }

    .hero-motif {
        --motif-size: clamp(4.5rem, 28vw, 7rem);
        --motif-opacity: 0.22;
        inset-block-start: var(--space-md);
        inset-inline-end: var(--space-md);
    }

    .hero-copy--home .hero-subtitle {
        font-size: var(--text-base);
    }

    .hero-panel-stack {
        gap: var(--space-sm);
    }

    .stats-grid--tight {
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.35rem;
    }

    .stat-chip {
        padding: 0.65rem 0.45rem;
        text-align: center;
    }

    .stat-chip-value {
        font-size: var(--text-xl);
    }

    .activity-panel__heading,
    .activity-panel__body {
        padding-inline: var(--space-md);
    }

    .activity-summary {
        display: none;
    }

    .home-pathways {
        margin-block-start: var(--space-lg);
    }

    .home-pathways__header {
        padding: var(--space-md);
        border: 1px solid var(--border-subtle);
        border-radius: var(--radius-md) var(--radius-md) 0 0;
        background-color: color-mix(in srgb, var(--bg-parchment) 90%, var(--accent-navy) 10%);
    }

    .home-pathways__header .section-title {
        margin-block-start: var(--space-xs);
        font-size: var(--text-xl);
    }

    .home-pathways__grid {
        gap: var(--space-sm);
        margin-block-start: var(--space-sm);
    }

    .home-pathways__grid .card,
    .home-pathways__beaker {
        padding: var(--space-md);
    }

    .home-pathways__beaker {
        margin-block-start: var(--space-sm);
    }

    .section-updates__heading {
        border-inline-end: 0;
        border-block-end: 1px solid var(--border-subtle);
    }

    .section-header,
    .card-meta-row,
    .card-footer-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .section-updates,
    .card--beaker-shelf {
        display: block;
    }

    .card--beaker-shelf .card-statline {
        display: block;
        margin-block-start: var(--space-md);
    }
}

/* Hamburger Button */
.hamburger {
    display: none;
    min-inline-size: 2.75rem;
    min-block-size: 2.75rem;
    background: var(--surface-paper);
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0.4em 0.5em;
    cursor: pointer;
    color: var(--accent-navy);
    box-shadow: 0.14rem 0.14rem 0 var(--shadow-subtle);
}

.hamburger:hover {
    border-color: var(--accent-cyan);
}

.hamburger-icon,
.hamburger-icon::before,
.hamburger-icon::after {
    display: block;
    width: 20px;
    height: 2px;
    background-color: var(--accent-navy);
    border-radius: 1px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hamburger-icon {
    position: relative;
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: "";
    position: absolute;
    inset-inline-start: 0;
}

.hamburger-icon::before {
    inset-block-start: -6px;
}

.hamburger-icon::after {
    inset-block-start: 6px;
}

/* X shape when active */
.hamburger.is-active .hamburger-icon {
    background-color: transparent;
}

.hamburger.is-active .hamburger-icon::before {
    inset-block-start: 0;
    transform: rotate(45deg);
}

.hamburger.is-active .hamburger-icon::after {
    inset-block-start: 0;
    transform: rotate(-45deg);
}

@media (max-width: 899px) {
    .hamburger {
        display: block;
    }

    .nav-links {
        display: none;
        flex-direction: column;
        align-items: stretch;
    }

    .nav-links.nav-open {
        display: flex;
    }

    .nav-links a {
        margin-inline-start: 0;
        padding-block: var(--space-sm);
        padding-inline: 0;
        border-block-end: 1px solid var(--border-subtle);
    }

    .nav-links a:last-child {
        border-block-end: none;
    }
}

/* Floating Table of Contents */
.floating-toc {
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    font-family: var(--font-transit);
    font-size: var(--text-sm);
    border-inline-start: 3px solid var(--accent-cyan);
    padding-inline-start: var(--space-md);
}

.toc-heading {
    font-weight: bold;
    color: var(--accent-navy);
    margin-block-end: 0.5rem;
    font-family: var(--font-transit);
    font-size: var(--text-sm);
    cursor: default;
    list-style: none;
}

.toc-heading:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

/* Desktop: hide the disclosure triangle — sidebar is always open */
@media (min-width: 900px) {
    .toc-heading {
        padding: 0;
    }

    .toc-heading::-webkit-details-marker {
        display: none;
    }

    .toc-heading::marker {
        content: "";
    }
}

/* Mobile: TOC becomes a collapsible dropdown above content */
@media (max-width: 899px) {
.floating-toc {
        position: static;
        max-height: none;
        overflow-y: visible;
        border-inline-start: 0;
        padding-inline-start: 0;
        border: 2px solid var(--border-subtle);
        border-block-start: 4px solid var(--accent-cyan);
        border-radius: var(--radius-md);
        padding: var(--space-sm) var(--space-md);
        background-color: var(--surface-paper);
        box-shadow: 0.22rem 0.22rem 0 var(--shadow-chemdraw);
    }

    .toc-heading {
        cursor: pointer;
        padding: var(--space-xs) 0;
    }

.floating-toc[open] .toc-heading {
        border-block-end: 1px solid var(--border-subtle);
        padding-block-end: var(--space-sm);
        margin-block-end: var(--space-sm);
    }
}

.floating-toc a {
    display: block;
    padding: var(--space-xs) 0;
    color: var(--text-sage);
    text-decoration: none;
}

.floating-toc a:hover,
.floating-toc a.active {
    color: var(--accent-navy);
    border-inline-start: 2px solid var(--accent-navy);
    margin-inline-start: -2px;
}

.floating-toc ul {
    list-style: none;
    padding-inline-start: 0;
}

.floating-toc ul ul {
    padding-inline-start: var(--space-md);
}

/* Footer */
.site-footer {
    position: relative;
    border-block-start: 1px solid var(--border-subtle);
    padding-block: var(--space-xl);
    background: var(--footer-bg);
}

.site-footer::before {
    content: "";
    position: absolute;
    inset-block-start: 0.9rem;
    inset-inline: 0;
    block-size: 1px;
    background-color: var(--border-subtle);
}

.site-footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.site-footer-brand {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
}

.site-footer-logo {
    font-family: var(--font-transit);
    font-weight: 700;
    font-size: var(--text-base);
    color: var(--accent-navy);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.site-footer-tagline {
    font-family: var(--font-transit);
    font-size: var(--text-sm);
    color: var(--text-sage);
    margin: 0;
}

.site-footer-nav {
    display: flex;
    gap: var(--space-lg);
}

.site-footer-nav a {
    font-family: var(--font-transit);
    font-size: var(--text-sm);
    color: var(--text-sage);
    text-decoration: none;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 700;
}

.site-footer-nav a:hover {
    color: var(--accent-navy);
}

.site-footer-copy {
    font-family: var(--font-transit);
    font-size: var(--text-xs);
    color: var(--text-sage);
    margin: 0;
}

@media (max-width: 899px) {
    .site-footer-content {
        flex-direction: column;
        text-align: center;
    }

    .site-footer-brand {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .site-footer-nav {
        gap: var(--space-md);
    }
}

/* Callout Blocks */
.callout {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    padding-block: var(--space-md);
    padding-inline: var(--space-lg);
    border-radius: var(--radius-md);
    border: 2px solid;
    border-inline-start-width: 0.55rem;
    margin-block: var(--space-lg);
    margin-inline: 0;
    box-shadow: 0.3rem 0.3rem 0 var(--callout-shadow);
}

.callout::after {
    content: "";
    position: absolute;
    inset-block-start: var(--space-md);
    inset-inline-end: var(--space-md);
    inline-size: clamp(3.4rem, 14%, 5rem);
    aspect-ratio: 1.45;
    border: 1px solid currentColor;
    border-inline-start-width: 0.32rem;
    background:
        linear-gradient(currentColor 1px, transparent 1px),
        linear-gradient(90deg, currentColor 1px, transparent 1px),
        transparent;
    background-size: 0.55rem 0.55rem;
    box-shadow: 0.16rem 0.16rem 0 color-mix(in srgb, currentColor 24%, transparent);
    opacity: 0.18;
    pointer-events: none;
    z-index: 0;
}

.callout > * {
    position: relative;
    z-index: 1;
}

.callout-title {
    font-family: var(--font-transit);
    font-weight: 700;
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-block-end: var(--space-sm);
}

.callout-body {
    font-size: var(--text-sm);
    line-height: 1.6;
}

.callout-body p:last-child {
    margin-bottom: 0;
}

.callout--navy {
    background-color: var(--callout-navy-bg);
    color: var(--callout-navy-text);
    border-color: var(--callout-navy-border);
}

.callout--sage {
    background-color: var(--callout-sage-bg);
    color: var(--callout-sage-text);
    border-color: var(--callout-sage-border);
}

.callout--mustard {
    background-color: var(--accent-mustard);
    color: var(--callout-mustard-text);
    border-color: var(--callout-mustard-border);
}

/* Theme Toggle */
.theme-toggle {
    min-inline-size: 2.75rem;
    min-block-size: 2.75rem;
    background: var(--surface-paper);
    border: 2px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 0.35em 0.45em;
    cursor: pointer;
    color: var(--accent-navy);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0.14rem 0.14rem 0 var(--shadow-subtle);
    transition: color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--accent-sage);
    border-color: var(--accent-sage);
    transform: translate(-1px, -1px);
}

[data-theme="light"] .theme-icon-moon { display: block; }
[data-theme="light"] .theme-icon-sun  { display: none; }
[data-theme="dark"]  .theme-icon-moon { display: none; }
[data-theme="dark"]  .theme-icon-sun  { display: block; }

/* Theme transition animation */
@media (prefers-reduced-motion: no-preference) {
    .theme-transitioning,
    .theme-transitioning *,
    .theme-transitioning *::before,
    .theme-transitioning *::after {
        transition: background-color 250ms ease, color 250ms ease, border-color 250ms ease, box-shadow 250ms ease !important;
    }
}