/* davidrobinson.au - light executive theme */

:root {
    --ink: #14120f;
    --ink-soft: #4a453e;
    --ink-faint: #7d766c;
    --paper: #fbfaf7;
    --paper-alt: #f3f0ea;
    --rule: #e2ddd3;
    --accent: #1f4d5c;
    --accent-soft: #dceaee;
    --accent-warm: #9a5b28;

    --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

    --max: 1140px;
    --gutter: clamp(1.25rem, 4vw, 3rem);
    --section-y: clamp(4rem, 9vw, 8rem);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 17px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    font-family: var(--serif);
    font-weight: 600;
    line-height: 1.15;
    letter-spacing: -0.015em;
    margin: 0 0 0.5em;
    text-wrap: balance;
}

h1 {
    font-size: clamp(2.6rem, 6vw, 4.5rem);
}

h2 {
    font-size: clamp(1.9rem, 3.6vw, 2.8rem);
}

h3 {
    font-size: clamp(1.15rem, 1.8vw, 1.4rem);
}

p {
    margin: 0 0 1.1em;
    color: var(--ink-soft);
    text-wrap: pretty;
}

a {
    color: var(--accent);
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
}

a:hover {
    color: var(--accent-warm);
}

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

.wrap {
    max-width: var(--max);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

.section {
    padding-block: var(--section-y);
    border-top: 1px solid var(--rule);
}

.section--tint {
    background: var(--paper-alt);
}

.eyebrow {
    font-family: var(--sans);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 1rem;
}

.lede {
    font-size: clamp(1.1rem, 1.6vw, 1.3rem);
    color: var(--ink-soft);
    max-width: 62ch;
}

.section__head {
    max-width: 68ch;
    margin-bottom: clamp(2rem, 4vw, 3.5rem);
}

/* ---------- header ---------- */

.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(251, 250, 247, 0.88);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--rule);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    min-height: 68px;
}

.brand {
    font-family: var(--serif);
    font-size: 1.15rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--ink);
    text-decoration: none;
}

.brand span {
    color: var(--ink-faint);
    font-family: var(--sans);
    font-size: 0.7rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    display: block;
    margin-top: 2px;
}

.nav {
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2.5vw, 2rem);
}

.nav a {
    font-size: 0.9rem;
    color: var(--ink-soft);
    text-decoration: none;
}

.nav a:hover,
.nav a[aria-current="page"] {
    color: var(--ink);
    text-decoration: underline;
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--rule);
    border-radius: 6px;
    padding: 0.45rem 0.7rem;
    font-size: 0.85rem;
    color: var(--ink);
    cursor: pointer;
}

/* ---------- buttons ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border-radius: 2px;
    font-size: 0.92rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--accent);
    transition: background 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.btn--primary {
    background: var(--accent);
    color: #fff;
}

.btn--primary:hover {
    background: #163b47;
    color: #fff;
    transform: translateY(-1px);
}

.btn--ghost {
    background: transparent;
    color: var(--accent);
}

.btn--ghost:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 2rem;
}

/* ---------- hero ---------- */

.hero {
    padding-block: clamp(4rem, 10vw, 8.5rem) clamp(3rem, 7vw, 6rem);
}

.hero__grid {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(2rem, 6vw, 5rem);
    align-items: start;
}

.hero h1 em {
    font-style: italic;
    color: var(--accent);
}

.hero__meta {
    border-left: 2px solid var(--accent);
    padding-left: 1.5rem;
    margin-top: 0.6rem;
}

.hero__meta dl {
    margin: 0;
    display: grid;
    gap: 1.1rem;
}

.hero__meta dt {
    font-size: 0.68rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-faint);
    font-weight: 700;
}

.hero__meta dd {
    margin: 0.2rem 0 0;
    font-family: var(--serif);
    font-size: 1.05rem;
    color: var(--ink);
}

/* ---------- metrics ---------- */

.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1px;
    background: var(--rule);
    border-block: 1px solid var(--rule);
}

.metric {
    background: var(--paper);
    padding: clamp(1.5rem, 3vw, 2.4rem) 1.25rem;
    text-align: center;
}

.metric__value {
    font-family: var(--serif);
    font-size: clamp(2.1rem, 4vw, 3rem);
    line-height: 1;
    color: var(--accent);
}

.metric__label {
    margin: 0.6rem 0 0;
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--ink-faint);
}

/* ---------- cards ---------- */

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: clamp(1.25rem, 2.5vw, 2rem);
}

.card {
    background: var(--paper);
    border: 1px solid var(--rule);
    padding: clamp(1.5rem, 2.5vw, 2.1rem);
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.card__tag {
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-warm);
    font-weight: 700;
}

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

.card__result {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--rule);
    font-family: var(--serif);
    font-size: 1rem;
    color: var(--ink);
}

/* ---------- capabilities ---------- */

.caps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: clamp(1.5rem, 3vw, 2.75rem);
}

.cap h3 {
    padding-bottom: 0.6rem;
    border-bottom: 2px solid var(--accent);
    margin-bottom: 1rem;
}

.cap ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    gap: 0.55rem;
}

.cap li {
    font-size: 0.94rem;
    color: var(--ink-soft);
    padding-left: 1.1rem;
    position: relative;
}

.cap li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.62em;
    width: 6px;
    height: 1px;
    background: var(--accent-warm);
}

/* ---------- patent ---------- */

.patent {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: center;
}

.patent__plate {
    border: 1px solid var(--accent);
    padding: clamp(1.75rem, 3vw, 2.5rem);
    background: var(--paper);
    text-align: center;
}

.patent__number {
    font-family: var(--mono);
    font-size: clamp(1.4rem, 3vw, 2rem);
    letter-spacing: 0.04em;
    color: var(--accent);
    display: block;
    margin-bottom: 0.5rem;
}

.patent__plate span.small {
    font-size: 0.72rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-faint);
}

/* ---------- timeline ---------- */

.timeline {
    position: relative;
    margin-top: clamp(2rem, 4vw, 3rem);
    padding-left: clamp(1.5rem, 4vw, 3rem);
}

.timeline::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: var(--rule);
}

.timeline__progress {
    position: absolute;
    left: 6px;
    top: 8px;
    width: 1px;
    background: var(--accent);
    height: 0;
    transform-origin: top;
}

.era {
    margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.era__label {
    position: sticky;
    top: 78px;
    z-index: 5;
    display: inline-block;
    background: var(--paper);
    padding: 0.35rem 0.9rem 0.35rem 0;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--accent-warm);
    margin-bottom: 1.5rem;
}

.entry {
    position: relative;
    padding: 0 0 2.25rem 0;
    opacity: 0;
    transform: translateY(22px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.entry.is-visible {
    opacity: 1;
    transform: none;
}

.entry::before {
    content: "";
    position: absolute;
    left: calc(-1 * clamp(1.5rem, 4vw, 3rem) + 2px);
    top: 0.55rem;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--paper);
    border: 2px solid var(--accent);
}

.entry--milestone::before {
    background: var(--accent-warm);
    border-color: var(--accent-warm);
    box-shadow: 0 0 0 4px var(--accent-soft);
}

.entry__year {
    font-family: var(--mono);
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    color: var(--ink-faint);
}

.entry__title {
    font-family: var(--serif);
    font-size: 1.3rem;
    margin: 0.15rem 0 0.1rem;
}

.entry__org {
    font-size: 0.9rem;
    color: var(--accent);
    margin-bottom: 0.7rem;
}

.entry ul {
    margin: 0.5rem 0 0;
    padding-left: 1.1rem;
    display: grid;
    gap: 0.4rem;
}

.entry li {
    color: var(--ink-soft);
    font-size: 0.95rem;
}

.entry__badge {
    display: inline-block;
    margin-bottom: 0.4rem;
    font-size: 0.66rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent-warm);
    border: 1px solid var(--accent-warm);
    border-radius: 2px;
    padding: 0.15rem 0.5rem;
}

/* ---------- filters ---------- */

.filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.filters button {
    font: inherit;
    font-size: 0.85rem;
    padding: 0.45rem 1rem;
    border: 1px solid var(--rule);
    background: var(--paper);
    color: var(--ink-soft);
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.16s ease;
}

.filters button:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.filters button[aria-pressed="true"] {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.entry[hidden] {
    display: none;
}

/* ---------- writing ---------- */

.posts {
    display: grid;
    gap: 0;
    border-top: 1px solid var(--rule);
}

.post {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    gap: clamp(1rem, 3vw, 2.5rem);
    padding-block: 2rem;
    border-bottom: 1px solid var(--rule);
}

.post__date {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--ink-faint);
    padding-top: 0.35rem;
}

.post h3 {
    margin-bottom: 0.4rem;
}

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

.badge-soon {
    display: inline-block;
    font-size: 0.66rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--ink-faint);
    border: 1px solid var(--rule);
    padding: 0.15rem 0.5rem;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* ---------- contact ---------- */

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
}

.contact-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 1.5rem;
}

.contact-list dt,
.contact-list .label {
    font-size: 0.68rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-faint);
    font-weight: 700;
}

.contact-list .value {
    font-family: var(--serif);
    font-size: 1.15rem;
    margin-top: 0.2rem;
}

.callout {
    border: 1px solid var(--rule);
    border-left: 3px solid var(--accent);
    background: var(--paper);
    padding: clamp(1.5rem, 3vw, 2.25rem);
}

.callout ul {
    margin: 0.75rem 0 0;
    padding-left: 1.1rem;
    display: grid;
    gap: 0.5rem;
    color: var(--ink-soft);
}

/* ---------- cta ---------- */

.cta {
    background: var(--accent);
    color: #fff;
    padding-block: clamp(3.5rem, 7vw, 6rem);
}

.cta h2,
.cta p {
    color: #fff;
}

.cta p {
    opacity: 0.86;
    max-width: 56ch;
}

.cta .btn--primary {
    background: #fff;
    color: var(--accent);
    border-color: #fff;
}

.cta .btn--primary:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.cta .btn--ghost {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.55);
}

.cta .btn--ghost:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

/* ---------- footer ---------- */

.site-footer {
    border-top: 1px solid var(--rule);
    padding-block: 2.5rem;
    font-size: 0.85rem;
    color: var(--ink-faint);
}

.site-footer__inner {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
}

.site-footer a {
    color: var(--ink-soft);
    text-decoration: none;
}

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

.skip-link {
    position: absolute;
    left: -9999px;
}

.skip-link:focus {
    left: var(--gutter);
    top: 0.5rem;
    z-index: 100;
    background: var(--accent);
    color: #fff;
    padding: 0.6rem 1rem;
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {

    .hero__grid,
    .patent,
    .contact-grid {
        grid-template-columns: 1fr;
    }

    .post {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }

    .nav-toggle {
        display: block;
    }

    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        background: var(--paper);
        border-bottom: 1px solid var(--rule);
        padding: 0.5rem var(--gutter) 1rem;
    }

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

    .nav a {
        padding: 0.65rem 0;
        width: 100%;
        border-bottom: 1px solid var(--rule);
    }

    .era__label {
        top: 70px;
    }
}

@media print {

    .site-header,
    .site-footer,
    .filters,
    .cta {
        display: none;
    }

    body {
        background: #fff;
    }

    .entry {
        opacity: 1;
        transform: none;
    }
}

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

    .entry {
        opacity: 1;
        transform: none;
        transition: none;
    }
}