/* ==========================================================================
   Layout — masthead, hero, section headers, contact, colophon
   ========================================================================== */

/* --- Masthead -------------------------------------------------------------- */

.masthead {
    position: fixed;
    inset: 0 0 auto;
    z-index: 50;
    height: var(--masthead-h);
    background: color-mix(in srgb, var(--paper) 84%, transparent);
    backdrop-filter: blur(14px) saturate(1.2);
    -webkit-backdrop-filter: blur(14px) saturate(1.2);
    border-bottom: 1px solid var(--rule);
}

.masthead-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    border: 1px solid var(--ink);
    border-radius: 50%;
    font-family: var(--font-display);
    font-size: 1.05rem;
    line-height: 1;
    letter-spacing: -0.06em;
    transition: background-color var(--duration-fast) ease, color var(--duration-fast) ease;
}

.brand-mark em {
    color: var(--signal-ink);
}

.brand:hover .brand-mark {
    background: var(--ink);
    color: var(--paper);
}

.brand-name {
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    letter-spacing: 0.02em;
}

.brand-name span {
    color: var(--ink-muted);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: clamp(1.25rem, 3vw, 2.75rem);
}

.site-nav ol {
    display: flex;
    gap: clamp(1rem, 2.4vw, 2.25rem);
    padding: 0;
    list-style: none;
}

.site-nav ol a {
    position: relative;
    display: inline-flex;
    align-items: baseline;
    gap: 0.45em;
    padding-block: 0.5rem;
    font-size: var(--text-sm);
    color: var(--ink-soft);
    text-decoration: none;
    transition: color var(--duration-fast) ease;
}

.site-nav ol a::after {
    content: '';
    position: absolute;
    inset: auto 0 0.15rem;
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--duration-normal) var(--ease-out-expo);
}

.site-nav ol a:hover,
.site-nav ol a[aria-current] {
    color: var(--ink);
}

.site-nav ol a:hover::after,
.site-nav ol a[aria-current]::after {
    transform: scaleX(1);
    transform-origin: left;
}

.nav-index {
    font-family: var(--font-mono);
    font-size: var(--text-2xs);
    color: var(--ink-muted);
    transition: color var(--duration-fast) ease;
}

.site-nav a[aria-current] .nav-index {
    color: var(--signal-ink);
}

.nav-cta {
    padding: 0.7em 1.15em;
}

.menu-toggle {
    display: none;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    background: none;
    border: 0;
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    cursor: pointer;
}

.menu-toggle-icon {
    position: relative;
    width: 1.375rem;
    height: 0.625rem;
}

.menu-toggle-icon::before,
.menu-toggle-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 1.5px;
    background: currentColor;
    transition: transform var(--duration-normal) var(--ease-out-expo), top var(--duration-normal) var(--ease-out-expo);
}

.menu-toggle-icon::before {
    top: 0;
}

.menu-toggle-icon::after {
    top: calc(100% - 1.5px);
}

.masthead[data-open] .menu-toggle-icon::before {
    top: calc(50% - 0.75px);
    transform: rotate(45deg);
}

.masthead[data-open] .menu-toggle-icon::after {
    top: calc(50% - 0.75px);
    transform: rotate(-45deg);
}

@media (max-width: 860px) {
    .brand-name {
        display: none;
    }

    html:not(.js-ready) .site-nav ol {
        display: none;
    }

    .js-ready .menu-toggle {
        display: inline-flex;
    }

    .js-ready .site-nav {
        position: absolute;
        inset: 100% 0 auto;
        flex-direction: column;
        align-items: stretch;
        gap: 1.5rem;
        padding: 0.5rem var(--gutter) 1.75rem;
        background: var(--paper);
        border-bottom: 1px solid var(--rule-strong);
        visibility: hidden;
        opacity: 0;
        transform: translateY(-0.5rem);
        transition:
            opacity var(--duration-normal) var(--ease-out-expo),
            transform var(--duration-normal) var(--ease-out-expo),
            visibility 0s linear var(--duration-normal);
    }

    .js-ready .masthead[data-open] .site-nav {
        visibility: visible;
        opacity: 1;
        transform: none;
        transition-delay: 0s;
    }

    .js-ready .site-nav ol {
        flex-direction: column;
        gap: 0;
    }

    .js-ready .site-nav ol a {
        width: 100%;
        gap: 1rem;
        padding-block: 0.9rem;
        border-bottom: 1px solid var(--rule);
        font-family: var(--font-display);
        font-size: var(--text-xl);
        color: var(--ink);
    }

    .js-ready .site-nav ol a::after {
        display: none;
    }

    .js-ready .nav-cta {
        justify-content: center;
    }
}

/* --- Hero ------------------------------------------------------------------ */

.hero {
    position: relative;
    isolation: isolate;
    display: flex;
    flex-direction: column;
    min-height: 100svh;
    padding-top: calc(var(--masthead-h) + clamp(1.25rem, 3vw, 2.5rem));
    padding-bottom: clamp(2rem, 4vw, 3rem);
}

/* Graph-paper field, fading out toward the edges */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 48px 48px;
    -webkit-mask-image: radial-gradient(ellipse 85% 75% at 70% 45%, #000 25%, transparent 78%);
    mask-image: radial-gradient(ellipse 85% 75% at 70% 45%, #000 25%, transparent 78%);
}

.dateline {
    display: flex;
    flex-wrap: wrap;
    border-block: 1px solid var(--rule-strong);
    color: var(--ink-soft);
}

.dateline li {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.7rem 1.25rem;
    border-left: 1px solid var(--rule);
}

.dateline li:first-child {
    padding-left: 0;
    border-left: 0;
}

.dateline li:last-child {
    margin-left: auto;
    padding-right: 0;
}

.dateline time:empty {
    display: none;
}

.dateline time {
    color: var(--ink-muted);
}

.status-dot {
    position: relative;
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--signal);
}

@media (prefers-reduced-motion: no-preference) {
    .status-dot::after {
        content: '';
        position: absolute;
        inset: 0;
        border-radius: 50%;
        background: var(--signal);
        animation: pulse 2.4s var(--ease-out-expo) 1s 3;
    }
}

@keyframes pulse {
    from {
        opacity: 0.6;
        transform: scale(1);
    }

    to {
        opacity: 0;
        transform: scale(3.2);
    }
}

/* Name and contents share one grid cell; the contents only appear where
   the short first line ("George") leaves room at the top right. */
.hero-head {
    display: grid;
    margin-top: clamp(1.75rem, 4vw, 3.25rem);
}

.hero-head > * {
    grid-area: 1 / 1;
}

.contents {
    display: none;
    justify-self: end;
    align-self: start;
    width: min(22rem, 30vw);
    padding-top: 0.75rem;
}

.contents ol {
    margin-top: 0.75rem;
    padding: 0;
    list-style: none;
    border-top: 1px solid var(--rule-strong);
}

.contents a {
    display: grid;
    grid-template-columns: 1.75rem auto minmax(1rem, 1fr) auto;
    align-items: baseline;
    gap: 0.6rem;
    padding-block: 0.6rem;
    border-bottom: 1px solid var(--rule);
    text-decoration: none;
}

.contents-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    line-height: 1.1;
    transition: color var(--duration-fast) ease;
}

.contents-leader {
    border-bottom: 1px dotted var(--ink-muted);
}

.contents a:hover .contents-name {
    font-style: italic;
    color: var(--signal-ink);
}

@media (min-width: 1180px) {
    .contents {
        display: block;
    }
}

.hero-title {
    font-size: var(--text-hero);
    line-height: 0.86;
    letter-spacing: -0.035em;
}

.hero-line {
    display: block;
}

.hero-line em {
    font-style: italic;
    letter-spacing: -0.045em;
}

.hero-line--offset {
    padding-left: clamp(0rem, 9vw, 9rem);
}

.hero-body {
    align-items: start;
    row-gap: 2.5rem;
    margin-top: clamp(2rem, 4vw, 3.25rem);
}

.hero-intro {
    grid-column: 1 / span 5;
}

.hero-role {
    font-size: var(--text-xl);
    font-weight: 500;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

.hero-focus {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.75rem;
    color: var(--signal-ink);
}

.hero-focus::before {
    content: '';
    width: 2rem;
    height: 1px;
    background: currentColor;
}

.hero-lede {
    max-width: 36ch;
    margin-top: 1.5rem;
    font-size: var(--text-lg);
    line-height: 1.5;
    color: var(--ink-soft);
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
}

.hero-figure {
    grid-column: 7 / -1;
}

.hero-foot {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-top: auto;
    padding-top: clamp(2.5rem, 5vw, 4rem);
}

.scroll-cue {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--ink);
    text-decoration: none;
}

.scroll-cue:hover .icon {
    transform: translateY(3px);
}

@media (max-width: 960px) {
    .hero-intro,
    .hero-figure {
        grid-column: 1 / -1;
    }

    .hero-figure {
        max-width: 42rem;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 19.5vw;
    }

    .dateline li {
        padding-inline: 0;
        border-left: 0;
        width: 100%;
    }

    .dateline li + li {
        border-top: 1px solid var(--rule);
    }

    .dateline li:last-child {
        margin-left: 0;
    }

    .hero-foot .label:last-child {
        display: none;
    }
}

/* Hero load sequence */
@media (prefers-reduced-motion: no-preference) {
    .dateline,
    .hero-line,
    .contents,
    .hero-intro > *,
    .hero-figure {
        animation: rise 1.1s var(--ease-out-expo) both;
    }

    .dateline { animation-delay: 0.05s; }
    .contents { animation-delay: 0.38s; }
    .hero-line:nth-child(1) { animation-delay: 0.15s; }
    .hero-line:nth-child(2) { animation-delay: 0.27s; }
    .hero-intro > :nth-child(1) { animation-delay: 0.45s; }
    .hero-intro > :nth-child(2) { animation-delay: 0.52s; }
    .hero-intro > :nth-child(3) { animation-delay: 0.6s; }
    .hero-intro > :nth-child(4) { animation-delay: 0.68s; }
    .hero-figure { animation-delay: 0.5s; }
}

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(0.6em);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

/* --- Figure frame (shared by hero diagram) --------------------------------- */

.figure-frame {
    position: relative;
    border: 1px solid var(--rule-strong);
    background: color-mix(in srgb, var(--paper) 70%, transparent);
}

.figure-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    min-height: 2.5rem;
    padding: 0.35rem 1rem;
    border-bottom: 1px solid var(--rule);
}

.figure-toggle {
    margin-right: -0.5rem;
    padding: 0.35rem 0.5rem;
    background: none;
    border: 0;
    color: var(--ink-muted);
    cursor: pointer;
    transition: color var(--duration-fast) ease;
}

.figure-toggle:hover {
    color: var(--ink);
}

.figure-body {
    padding: clamp(0.75rem, 2vw, 1.5rem);
}

/* Registration marks on the frame corners */
.figure-frame::before,
.figure-frame::after {
    content: '';
    position: absolute;
    width: 0.75rem;
    height: 0.75rem;
    border-color: var(--signal);
    border-style: solid;
}

.figure-frame::before {
    top: -0.4rem;
    left: -0.4rem;
    border-width: 1.5px 0 0 1.5px;
}

.figure-frame::after {
    right: -0.4rem;
    bottom: -0.4rem;
    border-width: 0 1.5px 1.5px 0;
}

figcaption {
    margin-top: 0.85rem;
}

/* --- Sections ---------------------------------------------------------------- */

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

.section-head {
    align-items: end;
    row-gap: 1.25rem;
    margin-bottom: clamp(3rem, 6vw, 5.5rem);
    padding-top: 1rem;
    border-top: 1px solid var(--rule-strong);
}

.section-index {
    grid-column: 1 / span 2;
    align-self: start;
    color: var(--signal-ink);
}

.section-title {
    grid-column: 3 / span 7;
    font-size: var(--text-3xl);
    line-height: 0.95;
    letter-spacing: -0.025em;
}

.section-kicker {
    grid-column: 10 / -1;
    justify-self: end;
    text-align: right;
}

@media (max-width: 760px) {
    .section-index {
        grid-column: 1 / span 6;
    }

    .section-kicker {
        grid-column: 7 / -1;
        grid-row: 1;
        align-self: start;
    }

    .section-title {
        grid-column: 1 / -1;
    }
}

/* --- Contact (inverse) ------------------------------------------------------ */

.contact {
    --paper: var(--inverse-bg);
    --ink: var(--inverse-fg);
    --ink-soft: var(--inverse-fg);
    --ink-muted: var(--inverse-muted);
    --rule: var(--inverse-rule);
    --rule-strong: var(--inverse-fg);
    --signal-ink: var(--inverse-signal);
    --signal: var(--inverse-signal);
    --on-signal: var(--inverse-bg);

    background: var(--paper);
    color: var(--ink);
}

.contact-title {
    max-width: 13ch;
    font-size: var(--text-display);
    line-height: 0.9;
    letter-spacing: -0.035em;
}

.contact-title em {
    color: var(--signal-ink);
}

.contact-email {
    display: inline-flex;
    align-items: center;
    gap: 0.35em;
    max-width: 100%;
    margin-top: clamp(2.5rem, 5vw, 4rem);
    padding-bottom: 0.15em;
    border-bottom: 1px solid currentColor;
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    line-height: 1.1;
    text-decoration: none;
    overflow-wrap: anywhere;
    transition: color var(--duration-fast) ease;
}

.contact-email:hover {
    color: var(--signal-ink);
}

.contact-email:hover .icon {
    transform: translate(0.1em, -0.1em);
}

.contact-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
}

/* --- Colophon (footer) ------------------------------------------------------ */

.colophon {
    padding-block: clamp(3rem, 6vw, 5rem) 2rem;
}

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

.colophon-grid div {
    padding-top: 1rem;
    border-top: 1px solid var(--rule-strong);
}

.colophon-grid dd {
    margin-top: 0.75rem;
    font-family: var(--font-display);
    font-size: var(--text-xl);
    line-height: 1.2;
}

.colophon-base {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 1rem;
    margin-top: clamp(3rem, 6vw, 5rem);
    padding-top: 1.25rem;
    border-top: 1px solid var(--rule);
}

.colophon-base a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--ink);
    text-decoration: none;
}

.colophon-base a:hover .icon {
    transform: translateY(-3px);
}

@media (max-width: 760px) {
    .colophon-grid {
        grid-template-columns: 1fr;
    }
}