*, *::before, *::after {
    box-sizing: border-box;
}

html {
    color-scheme: dark;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding-top: var(--header-height, 78px);
    min-height: 100vh;
    background:
        radial-gradient(circle at 12% 5%, rgba(0, 212, 255, 0.09), transparent 31rem),
        radial-gradient(circle at 88% 22%, rgba(245, 158, 11, 0.07), transparent 27rem),
        var(--color-bg, #07111f);
    color: var(--color-text, #e8eef5);
    font-family: var(--font-body, system-ui, sans-serif);
    font-size: 1rem;
    line-height: 1.7;
    text-rendering: optimizeLegibility;
}

body.is-nav-open {
    overflow: hidden;
}

a {
    color: var(--color-accent, #00d4ff);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
}

a:hover,
a:focus-visible {
    color: var(--color-accent-strong, #7ae9ff);
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-highlight, #f59e0b);
    outline-offset: 4px;
}

img {
    display: block;
    max-width: 100%;
    height: auto;
}

button,
input,
textarea,
select {
    font: inherit;
}

h1,
h2,
h3,
h4 {
    margin-top: 0;
    font-family: var(--font-display, system-ui, sans-serif);
    font-weight: 250;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: var(--color-text, #e8eef5);
}

p,
ul,
ol,
blockquote {
    margin-top: 0;
}

.skip-link {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 1000;
    padding: 0.65rem 0.9rem;
    background: var(--color-text, #e8eef5);
    color: var(--color-bg, #07111f);
    transform: translateY(-160%);
}

.skip-link:focus {
    transform: translateY(0);
}

.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 300;
    height: var(--header-height, 78px);
    border-bottom: 1px solid rgba(87, 215, 231, 0.18);
    background: rgba(7, 17, 31, 0.91);
    backdrop-filter: blur(16px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    gap: 2rem;
    width: min(100% - 3rem, var(--content-width, 1180px));
    height: 100%;
    margin: 0 auto;
}

.site-brand {
    display: flex;
    flex: 0 0 auto;
    flex-direction: column;
    justify-content: center;
    line-height: 1;
}

.site-logo {
    color: var(--color-text, #e8eef5);
    text-decoration: none;
}

.site-logo:hover {
    color: var(--color-text, #e8eef5);
}

.site-logo__wordmark {
    display: inline-flex;
    align-items: baseline;
    gap: 0.28em;
    font-family: var(--font-display, system-ui, sans-serif);
    font-size: 1.35rem;
    font-weight: 300;
    letter-spacing: -0.03em;
}

.site-logo__accent {
    color: var(--color-highlight, #f59e0b);
}

.site-logo__tagline {
    margin-top: 0.35rem;
    color: rgba(232, 238, 245, 0.78);
    font-size: 0.68rem;
    font-style: italic;
    letter-spacing: 0.08em;
}

.site-nav {
    margin-left: auto;
}

.site-nav__list,
.nav-dropdown {
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-nav__list {
    display: flex;
    align-items: center;
    gap: 1.4rem;
}

.site-nav__item {
    position: relative;
}

.site-nav__item > a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.84rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-decoration: none;
    transition: color 150ms ease;
}

.site-nav__item > a:hover,
.site-nav__item > a.is-active {
    color: var(--color-accent, #00d4ff);
}

.nav-chevron {
    width: 0.4rem;
    height: 0.4rem;
    border-right: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
    transform: translateY(-0.12rem) rotate(45deg);
}

.nav-dropdown {
    position: absolute;
    top: calc(100% + 1rem);
    left: -1rem;
    min-width: 210px;
    padding: 0.65rem;
    border: 1px solid var(--color-border, #213953);
    border-radius: var(--radius-small, 5px);
    background: rgba(11, 24, 41, 0.98);
    box-shadow: var(--shadow-card);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(4px);
    transition: opacity 150ms ease, visibility 150ms ease, transform 150ms ease;
}

.site-nav__item--has-dropdown.is-open > .nav-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

.nav-dropdown a {
    display: block;
    padding: 0.55rem 0.4rem;
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.88rem;
    text-decoration: none;
}

.nav-dropdown a:hover {
    color: var(--color-accent, #00d4ff);
}

.nav-hamburger {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    margin-left: auto;
    padding: 0.35rem;
    border: 0;
    background: transparent;
    color: var(--color-text, #e8eef5);
    cursor: pointer;
}

.nav-hamburger span:not(.nav-hamburger__label) {
    width: 24px;
    height: 2px;
    background: currentColor;
}

.nav-hamburger__label {
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.14em;
}

.page-wrapper {
    width: min(100% - 3rem, var(--content-width, 1180px));
    margin: 0 auto;
    padding: clamp(2rem, 4vw, 4.5rem) 0;
}

.content-layout,
.content-layout--single {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
}

.content-main {
    min-width: 0;
}

.breadcrumbs {
    margin-bottom: 2rem;
}

.breadcrumbs__list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
    margin: 0;
    padding: 0;
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.78rem;
    letter-spacing: 0.04em;
    list-style: none;
}

.breadcrumbs__item + .breadcrumbs__item::before {
    content: "/";
    margin-right: 0.55rem;
    color: rgba(159, 176, 196, 0.5);
}

.breadcrumbs a {
    color: inherit;
}

.breadcrumbs__item.is-current {
    color: var(--color-text, #e8eef5);
}

.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    margin: 0 0 1rem;
    color: var(--color-accent-cyan, #57d7e7);
    font-family: var(--font-body, system-ui, sans-serif);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    line-height: 1.3;
    text-transform: uppercase;
}

.section-eyebrow::before {
    width: 1.9rem;
    height: 1px;
    background: currentColor;
    content: "";
}

.page-hero {
    margin-bottom: clamp(2.5rem, 6vw, 5.5rem);
}

.page-hero--compact {
    max-width: 900px;
}

.page-hero h2 {
    max-width: 18ch;
    margin-bottom: 1.25rem;
    font-size: clamp(2.45rem, 7vw, 5.6rem);
}

.page-hero__lead {
    max-width: 720px;
    margin-bottom: 0;
    color: var(--color-text-muted, #9fb0c4);
    font-size: clamp(1.05rem, 2vw, 1.35rem);
    line-height: 1.65;
}

.page-article,
.field-note,
.glossary-term,
.faq-item {
    max-width: var(--reading-width, 760px);
    margin: 0 auto;
}

.prose {
    color: #d4deea;
    font-size: 1.06rem;
}

.prose > * + * {
    margin-top: 1.3em;
}

.prose h2,
.prose h3 {
    margin-top: 2.4em;
    margin-bottom: 0.7em;
}

.prose h2 {
    font-size: clamp(1.8rem, 4vw, 2.65rem);
}

.prose h3 {
    font-size: 1.45rem;
}

.prose li + li {
    margin-top: 0.55rem;
}

.prose strong {
    color: var(--color-text, #e8eef5);
}

.text-muted {
    color: var(--color-text-muted, #9fb0c4);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-height: 48px;
    padding: 0.72rem 1.2rem;
    border: 1px solid transparent;
    border-radius: var(--radius-small, 5px);
    font-weight: 700;
    letter-spacing: 0.02em;
    text-decoration: none;
    transition: background 150ms ease, border-color 150ms ease, color 150ms ease, transform 150ms ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn--primary {
    background: var(--color-accent, #00d4ff);
    color: #031019;
}

.btn--primary:hover {
    background: var(--color-accent-strong, #7ae9ff);
    color: #031019;
}

.btn--outline {
    border-color: var(--color-accent, #00d4ff);
    background: transparent;
    color: var(--color-accent, #00d4ff);
}

.btn--outline:hover {
    background: rgba(0, 212, 255, 0.08);
}

.text-link,
.project-card__link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 700;
    text-decoration: none;
}

.home-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(360px, 0.92fr);
    gap: clamp(3rem, 8vw, 7rem);
    align-items: center;
    min-height: min(760px, calc(100vh - var(--header-height, 78px) - 5rem));
    padding: clamp(1rem, 3vw, 3rem) 0 clamp(4rem, 8vw, 7rem);
}

.home-hero h2 {
    max-width: 11ch;
    margin-bottom: 1.25rem;
    font-size: clamp(3.4rem, 8vw, 7.6rem);
}

.home-hero__anchor {
    max-width: 650px;
    margin-bottom: 1rem;
    color: var(--color-text, #e8eef5);
    font-size: clamp(1.3rem, 2.5vw, 1.85rem);
    line-height: 1.45;
}

.home-hero__support {
    max-width: 640px;
    color: var(--color-text-muted, #9fb0c4);
    font-size: 1.05rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1.35rem;
    align-items: center;
    margin-top: 2rem;
}

.workbench {
    position: relative;
    overflow: hidden;
    padding: 1.25rem;
    border: 1px solid var(--color-border, #213953);
    border-radius: var(--radius-medium, 10px);
    background:
        linear-gradient(rgba(87, 215, 231, 0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(87, 215, 231, 0.035) 1px, transparent 1px),
        rgba(11, 24, 41, 0.86);
    background-size: 30px 30px;
    box-shadow: var(--shadow-card);
}

.workbench::after {
    position: absolute;
    right: -5rem;
    bottom: -6rem;
    width: 16rem;
    height: 16rem;
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-large, 18px);
    content: "";
    transform: rotate(34deg);
}

.workbench__topline {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-bottom: 0.85rem;
    border-bottom: 1px solid var(--color-border, #213953);
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.69rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.workbench__topline span:last-child {
    color: var(--color-highlight, #f59e0b);
}

.workbench__loop {
    position: relative;
    z-index: 1;
    display: grid;
    gap: 0;
    margin: 0;
    padding: 1.2rem 0 0;
    list-style: none;
}

.workbench__loop li {
    display: grid;
    grid-template-columns: 2.3rem minmax(0, 1fr);
    gap: 0 0.85rem;
    padding: 0.9rem 0;
    border-bottom: 1px solid rgba(33, 57, 83, 0.75);
}

.workbench__loop span {
    grid-row: 1 / 3;
    color: var(--color-accent, #00d4ff);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.72rem;
}

.workbench__loop strong {
    color: var(--color-text, #e8eef5);
    font-size: 1.05rem;
}

.workbench__loop small {
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.8rem;
}

.workbench__result {
    position: relative;
    z-index: 1;
    margin: 1.25rem 0 0;
    color: var(--color-text, #e8eef5);
    font-size: 0.92rem;
}

.section-block {
    padding: clamp(4.5rem, 9vw, 8rem) 0;
    border-top: 1px solid rgba(33, 57, 83, 0.8);
}

.section-heading {
    margin-bottom: 2.5rem;
}

.section-heading h2,
.home-story h2,
.investigation-grid h2,
.home-next h2 {
    max-width: 15ch;
    margin-bottom: 0;
    font-size: clamp(2.2rem, 5vw, 4.4rem);
}

.section-heading--split {
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    align-items: end;
}

.home-story {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(3rem, 8vw, 8rem);
}

.home-story__copy {
    color: #d4deea;
    font-size: clamp(1.08rem, 2vw, 1.35rem);
}

.home-story__copy p:last-child {
    margin-bottom: 0;
}

.era-strip {
    padding: clamp(4.5rem, 9vw, 8rem) 0;
    border-top: 1px solid rgba(33, 57, 83, 0.8);
}

.era-strip__list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 0;
    padding: 0;
    list-style: none;
}

.era-strip__list li {
    min-height: 245px;
    padding: 1.4rem;
    border-top: 2px solid var(--color-border, #213953);
    border-right: 1px solid var(--color-border, #213953);
}

.era-strip__list li:first-child {
    border-top-color: var(--color-highlight, #f59e0b);
}

.era-strip__list li:nth-child(2) {
    border-top-color: #ef8354;
}

.era-strip__list li:nth-child(3) {
    border-top-color: var(--color-accent, #00d4ff);
}

.era-strip__list li:last-child {
    border-top-color: var(--color-accent-cyan, #57d7e7);
    border-right: 0;
}

.era-strip__number {
    display: inline-block;
    margin-bottom: 2.4rem;
    color: var(--color-text-muted, #9fb0c4);
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
    font-size: 0.76rem;
}

.era-strip h3 {
    margin-bottom: 0.75rem;
    font-size: 1.5rem;
}

.era-strip p {
    margin-bottom: 0;
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.92rem;
}

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

.project-card {
    display: flex;
    min-height: 290px;
    flex-direction: column;
    padding: 1.5rem;
    border: 1px solid var(--color-border, #213953);
    border-radius: var(--radius-medium, 10px);
    background: linear-gradient(150deg, rgba(17, 38, 61, 0.86), rgba(11, 24, 41, 0.72));
    transition: border-color 150ms ease, transform 150ms ease, box-shadow 150ms ease;
}

.project-card:hover {
    border-color: rgba(0, 212, 255, 0.52);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-3px);
}

.project-card__type {
    margin-bottom: 1.25rem;
    color: var(--color-highlight, #f59e0b);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.project-card h2,
.project-card h3 {
    margin-bottom: 0.9rem;
    font-size: 1.55rem;
}

.project-card h2 a,
.project-card h3 a {
    color: var(--color-text, #e8eef5);
    text-decoration: none;
}

.project-card h2 a:hover,
.project-card h3 a:hover {
    color: var(--color-accent, #00d4ff);
}

.project-card > p:not(.project-card__type) {
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.94rem;
}

.project-card__link {
    margin-top: auto;
    padding-top: 1rem;
    font-size: 0.86rem;
}

.investigation-grid {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(3rem, 8vw, 8rem);
}

.investigation-grid__intro > p:last-child {
    max-width: 600px;
    margin-top: 1.4rem;
    color: var(--color-text-muted, #9fb0c4);
}

.investigation-list {
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--color-border, #213953);
    list-style: none;
}

.investigation-list li {
    position: relative;
    padding: 1.15rem 0 1.15rem 2rem;
    border-bottom: 1px solid var(--color-border, #213953);
}

.investigation-list li::before {
    position: absolute;
    top: 1.55rem;
    left: 0;
    width: 0.75rem;
    height: 2px;
    background: var(--color-accent, #00d4ff);
    content: "";
}

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

.principles blockquote {
    margin: 0;
    padding: 1.5rem;
    border-left: 2px solid var(--color-highlight, #f59e0b);
    background: rgba(11, 24, 41, 0.75);
    color: var(--color-text, #e8eef5);
    font-family: var(--font-display, system-ui, sans-serif);
    font-size: clamp(1.25rem, 2.5vw, 1.7rem);
    font-weight: 250;
    line-height: 1.4;
}

.home-next {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(2rem, 7vw, 7rem);
    margin: clamp(4rem, 9vw, 8rem) 0 2rem;
    padding: clamp(2rem, 5vw, 4rem);
    border: 1px solid rgba(0, 212, 255, 0.35);
    border-radius: var(--radius-medium, 10px);
    background:
        radial-gradient(circle at 85% 20%, rgba(245, 158, 11, 0.1), transparent 17rem),
        var(--color-surface, #0b1829);
}

.home-next > div:last-child {
    align-self: end;
}

.home-next p {
    color: var(--color-text-muted, #9fb0c4);
}

.directory-root,
.directory-category,
.field-notes-index,
.glossary-index,
.faq-index {
    max-width: 1100px;
    margin: 0 auto;
}

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

.project-detail {
    max-width: 900px;
    margin: 0 auto;
}

.project-facts {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1px;
    margin: 0 0 3.5rem;
    padding: 1px;
    background: var(--color-border, #213953);
}

.project-facts > div {
    padding: 1.25rem;
    background: var(--color-surface, #0b1829);
}

.project-facts dt {
    margin-bottom: 0.55rem;
    color: var(--color-highlight, #f59e0b);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.project-facts dd {
    margin: 0;
    color: var(--color-text-muted, #9fb0c4);
}

.project-detail .prose {
    max-width: var(--reading-width, 760px);
}

.project-detail__visit {
    max-width: var(--reading-width, 760px);
    margin-top: 3.5rem;
    padding: 1.5rem;
    border-top: 1px solid var(--color-border, #213953);
    border-bottom: 1px solid var(--color-border, #213953);
}

.project-detail__visit p {
    color: var(--color-text-muted, #9fb0c4);
}

.note-list {
    display: grid;
    gap: 1rem;
    margin-top: 3.5rem;
}

.note-card {
    padding: clamp(1.4rem, 4vw, 2.4rem);
    border: 1px solid var(--color-border, #213953);
    border-radius: var(--radius-medium, 10px);
    background: rgba(11, 24, 41, 0.72);
}

.note-card__date {
    margin-bottom: 0.75rem;
    color: var(--color-highlight, #f59e0b);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.note-card h2 {
    margin-bottom: 0.75rem;
    font-size: clamp(1.6rem, 3vw, 2.3rem);
}

.note-card h2 a {
    color: var(--color-text, #e8eef5);
    text-decoration: none;
}

.note-card p:not(.note-card__date) {
    color: var(--color-text-muted, #9fb0c4);
}

.field-note__footer {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border, #213953);
}

.glossary-index > h1,
.faq-index > h1 {
    margin-bottom: 2.5rem;
    font-size: clamp(2.5rem, 6vw, 5rem);
}

.glossary-index__letter-group,
.faq-index__group {
    display: grid;
    grid-template-columns: 90px minmax(0, 1fr);
    gap: 1.5rem;
    padding: 2rem 0;
    border-top: 1px solid var(--color-border, #213953);
}

.glossary-index__letter-group > h2 {
    display: inline-flex;
    width: 2.4rem;
    height: 2.4rem;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-accent, #00d4ff);
    border-radius: var(--radius-small, 5px);
    color: var(--color-accent, #00d4ff);
    font-size: 1rem;
}

.glossary-index__list,
.faq-index__list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.glossary-index__list li,
.faq-index__list li {
    padding: 0 0 1.2rem;
}

.glossary-index__list li + li,
.faq-index__list li + li {
    padding-top: 1.2rem;
    border-top: 1px solid rgba(33, 57, 83, 0.62);
}

.glossary-index__list a,
.faq-index__list a {
    color: var(--color-text, #e8eef5);
    font-family: var(--font-display, system-ui, sans-serif);
    font-size: 1.25rem;
    text-decoration: none;
}

.glossary-index__list a:hover,
.faq-index__list a:hover {
    color: var(--color-accent, #00d4ff);
}

.glossary-index__short-def {
    margin: 0.45rem 0 0;
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.92rem;
}

.faq-index__group > h2 {
    color: var(--color-highlight, #f59e0b);
    font-size: 1rem;
    font-weight: 500;
}

.glossary-term h1,
.faq-item h1 {
    margin-bottom: 1.5rem;
    font-size: clamp(2.4rem, 6vw, 4.8rem);
}

.glossary-term__aka {
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.9rem;
}

.glossary-term__short-def {
    padding: 1.25rem;
    border-left: 2px solid var(--color-accent, #00d4ff);
    background: rgba(11, 24, 41, 0.75);
    font-size: 1.15rem;
}

.glossary-term__nuance {
    margin-top: 2rem;
    padding: 1.25rem;
    border: 1px solid var(--color-border, #213953);
    border-radius: var(--radius-small, 5px);
    color: var(--color-text-muted, #9fb0c4);
}

.glossary-term__related {
    margin-top: 3rem;
}

.site-footer {
    margin-top: clamp(5rem, 10vw, 9rem);
    padding: 4rem 0 1.5rem;
    border-top: 1px solid var(--color-border, #213953);
    background:
        radial-gradient(circle at 15% 40%, rgba(0, 212, 255, 0.06), transparent 25rem),
        #050d18;
}

.site-footer__inner {
    width: min(100% - 3rem, var(--content-width, 1180px));
    margin: 0 auto;
}

.site-footer__top {
    display: grid;
    grid-template-columns: minmax(260px, 1.4fr) 0.8fr 0.8fr;
    gap: 3rem;
    padding-bottom: 3rem;
}

.site-footer__brand-name {
    font-family: var(--font-display, system-ui, sans-serif);
    font-size: 1.5rem;
    font-weight: 250;
}

.site-footer__tagline {
    margin: 0.4rem 0 1rem;
    color: var(--color-highlight, #f59e0b);
    font-size: 0.88rem;
    font-style: italic;
}

.site-footer__note {
    max-width: 440px;
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.9rem;
}

.site-footer__col-heading {
    margin-bottom: 0.8rem;
    color: var(--color-accent-cyan, #57d7e7);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.site-footer__links {
    display: grid;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-footer__links a {
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.88rem;
    text-decoration: none;
}

.site-footer__links a:hover {
    color: var(--color-accent, #00d4ff);
}

.site-footer__bottom {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--color-border, #213953);
    color: var(--color-text-muted, #9fb0c4);
    font-size: 0.76rem;
}

.error-page {
    max-width: 680px;
    margin: 0 auto;
    padding: 6rem 0;
    text-align: center;
}

.error-page h1 {
    margin-bottom: 0.5rem;
    color: var(--color-text, #e8eef5);
    font-size: clamp(5rem, 18vw, 10rem);
}

.error-page > p:not(.section-eyebrow) {
    color: var(--color-text-muted, #9fb0c4);
}

.error-suggestions {
    max-width: 34rem;
    margin: 2rem auto;
    text-align: left;
}

.error-suggestions ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.error-suggestions li + li {
    margin-top: 0.5rem;
}

@media (max-width: 980px) {
    .site-nav__list {
        gap: 0.9rem;
    }

    .site-nav__item > a {
        font-size: 0.78rem;
    }

    .home-hero {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .workbench {
        max-width: 650px;
    }

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

    .era-strip__list li:nth-child(2) {
        border-right: 0;
    }

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

@media (max-width: 768px) {
    :root {
        --header-height: 74px;
    }

    .site-header {
        background: rgba(7, 17, 31, 0.98);
        -webkit-backdrop-filter: none;
        backdrop-filter: none;
    }

    .site-header__inner,
    .page-wrapper,
    .site-footer__inner {
        width: min(100% - 2rem, var(--content-width, 1180px));
    }

    .site-logo__wordmark {
        font-size: 1.15rem;
    }

    .site-logo__tagline {
        font-size: 0.6rem;
    }

    .nav-hamburger {
        display: flex;
    }

    .site-nav {
        position: fixed;
        top: var(--header-height, 74px);
        right: 0;
        bottom: 0;
        /* Explicit height required: .site-header carries a backdrop-filter,
           which makes it the containing block for this fixed panel, so
           top + bottom resolves against the header and computes to zero. */
        height: calc(100vh - var(--header-height, 74px));
        height: calc(100dvh - var(--header-height, 74px));
        left: 0;
        z-index: 400;
        margin: 0;
        padding: 1.25rem 1rem 3rem;
        overflow-y: auto;
        border-top: 1px solid var(--color-border, #213953);
        background: rgba(7, 17, 31, 0.99);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(-8px);
        transition: opacity 150ms ease, visibility 150ms ease, transform 150ms ease;
    }

    .site-nav.is-open {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .site-nav__list {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        max-width: 520px;
        margin: 0 auto;
    }

    .site-nav__item {
        padding: 0.85rem 0;
        border-bottom: 1px solid var(--color-border, #213953);
    }

    .site-nav__item > a {
        justify-content: space-between;
        width: 100%;
        color: var(--color-text, #e8eef5);
        font-size: 1.25rem;
        font-weight: 350;
    }

    .nav-dropdown {
        position: static;
        min-width: 0;
        margin-top: 0.55rem;
        padding: 0 0 0 1rem;
        border: 0;
        background: transparent;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: none;
    }

    .nav-dropdown a {
        padding: 0.4rem 0;
        font-size: 1rem;
    }

    .home-hero h2 {
        font-size: clamp(3.2rem, 18vw, 5rem);
    }

    .home-story,
    .investigation-grid,
    .home-next {
        grid-template-columns: 1fr;
    }

    .era-strip__list,
    .project-grid,
    .project-grid--directory,
    .principles__grid,
    .project-facts {
        grid-template-columns: 1fr;
    }

    .era-strip__list li {
        min-height: 0;
        border-right: 0;
    }

    .section-heading--split {
        display: block;
    }

    .section-heading--split .text-link {
        margin-top: 1.2rem;
    }

    .project-card {
        min-height: 250px;
    }

    .glossary-index__letter-group,
    .faq-index__group {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .site-footer__top {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .site-footer__brand-name {
        font-size: 1.8rem;
    }

    .site-footer__tagline,
    .site-footer__note {
        font-size: 1.15rem;
    }

    .site-footer__col-heading {
        font-size: 1rem;
    }

    .site-footer__links {
        gap: 0.8rem;
    }

    .site-footer__links a {
        font-size: 1.2rem;
    }

    .site-footer__bottom {
        flex-direction: column;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        align-items: stretch;
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .home-next {
        padding: 1.35rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *, *::before, *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}