:root {
    /* Design tokens */
    --bg-color: #000000;
    --text-color: #ffffff;
    --muted-text-color: #d9d9d9;
    --accent-color: #ff0000;
    --overlay-color: rgba(0, 0, 0, 0.8);
    --content-width: 800px;
    --font-family: Arial, Helvetica, sans-serif;
    --line-height: 1.6;
    --font-size-h1: 48px;
    --font-size-h2: 1.8rem;
    --font-size-caption: 12px;
    --font-size-record-title: 18px;
    --font-size-record-caption: 16px;
    --font-size-record-date: 14px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 20px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 40px;
}

/* Base and layout */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    margin: 0;
    line-height: var(--line-height);
}

.content {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: var(--space-lg);
}

main {
    margin-top: var(--space-lg);
}

p {
    text-align: center;
    margin: 0 0 var(--space-lg);
}

hr {
    border: none;
    height: 2px;
    background-color: var(--accent-color);
    margin: var(--space-xl) 0;
}

/* Typography */
.hourglass,
.tagline {
    color: var(--accent-color);
}

.exotics {
    color: var(--text-color);
}

h1 {
    color: var(--text-color);
    font-size: var(--font-size-h1);
    margin: 0 0 var(--space-xl);
    text-align: center;
    letter-spacing: 0.04em;
}

h2.page-title {
    color: var(--text-color);
    margin: var(--space-2xl) 0 var(--space-md);
    text-align: center;
    font-size: var(--font-size-h2);
    letter-spacing: 0.04em;
    text-transform: none;
}

h2.section-title,
h3.section-title {
    color: var(--text-color);
    margin: var(--space-2xl) 0 var(--space-md);
    text-align: center;
    font-size: 1.35rem;
    letter-spacing: 0.04em;
    text-transform: none;
}

.project-snapshot {
    max-width: 480px;
    margin: 0 auto var(--space-2xl);
}

.snapshot-list {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0 var(--space-lg);
    margin: 0 auto;
    text-align: left;
}

.snapshot-list dt,
.snapshot-list dd {
    margin: 0;
    padding: var(--space-xs) 0;
    border-bottom: 1px solid #333333;
}

.snapshot-list dt {
    color: var(--muted-text-color);
}

.snapshot-list dd {
    color: var(--text-color);
    text-align: right;
}

.tagline {
    text-align: center;
    font-size: 14px;
    margin-top: 0;
    margin-bottom: 26px;
}

.timeline-date {
    font-size: var(--font-size-caption);
    color: var(--muted-text-color);
    margin-top: -10px;
    margin-bottom: 22px;
}

.timeline-event-date {
    font-size: var(--font-size-record-date);
}

.timeline-event-title {
    font-size: var(--font-size-record-title);
    font-weight: normal;
    margin: 0 0 var(--space-sm);
    text-align: center;
}

.timeline-description {
    font-size: var(--font-size-record-caption);
    margin-bottom: calc(var(--space-3xl) + var(--space-xs));
}

/* Site header and navigation */
.brand-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    width: fit-content;
    max-width: 100%;
    margin: 0 auto 0;
    color: var(--text-color);
    text-decoration: none;
    transform: translateX(18px);
}

.brand-mark h1 {
    margin: 0;
}

.brand-mark:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
}

.site-logo {
    display: block;
    width: 80px;
    flex: 0 0 auto;
    transform: translateX(-12px);
}

.navigation {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 10px 18px;
    text-align: center;
    margin: 0 auto 18px;
    padding: var(--space-xs) 0;
}

.navigation a,
.contact-page a,
.contact-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.navigation a {
    position: relative;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
    opacity: 0.9;
}

.navigation a:hover,
.navigation a:focus-visible {
    color: var(--accent-color);
    opacity: 1;
}

.navigation a.active {
    color: var(--accent-color);
    font-weight: bold;
}

.navigation a.active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: -4px;
    height: 2px;
    background-color: var(--accent-color);
}

/* Links and accessibility utilities */
a {
    color: var(--text-color);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Gallery */
.gallery-item {
    color: var(--text-color);
    margin: 0 0 calc(var(--space-3xl) + var(--space-sm));
    text-align: center;
}

.gallery-item .timeline-date {
    font-size: var(--font-size-record-date);
}

.gallery-title {
    font-size: var(--font-size-record-title);
}

.gallery-caption {
    font-size: var(--font-size-record-caption);
}

.gallery-item a {
    display: inline-block;
    max-width: 100%;
}

.gallery-item img {
    width: 300px;
    max-width: 100%;
    height: auto;
    border: none;
    display: block;
    margin: 0 auto var(--space-sm);
    transition: opacity 0.2s ease;
}

.gallery-item a:hover img,
.gallery-item a:focus-visible img {
    opacity: 0.85;
}

/* Lightbox */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-color);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 999;
    padding: var(--space-lg);
    box-sizing: border-box;
    overflow: hidden;
}

.lightbox.show {
    display: flex;
}

.lightbox-image-button {
    --zoom-scale: 2;
    max-width: 90vw;
    max-height: 80vh;
    padding: 0;
    border: 0;
    background: transparent;
    line-height: 0;
    cursor: zoom-in;
    touch-action: manipulation;
}

.lightbox-image-button:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
}

.lightbox-image-button.zoomed {
    cursor: grab;
    touch-action: none;
}

.lightbox-image-button.is-panning {
    cursor: grabbing;
}

.lightbox img {
    max-width: 90vw;
    max-height: 80vh;
    width: auto;
    height: auto;
    border: none;
    display: block;
    transition: transform 0.15s ease;
    transform-origin: top left;
}

.lightbox-image-button.zoomed img {
    transform: translate(var(--pan-x, 0px), var(--pan-y, 0px)) scale(var(--zoom-scale));
}

.lightbox-image-button.is-panning img {
    transition: none;
}

.close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: var(--text-color);
    font-size: 40px;
    line-height: 1;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 4px 10px;
}

.close:hover,
.close:focus-visible {
    color: var(--accent-color);
    outline: none;
}

/* Contact page */
.contact-group + .contact-group {
    margin-top: var(--space-xl);
}

.contact-description {
    color: var(--muted-text-color);
    margin-bottom: var(--space-sm);
}

.contact-links {
    text-align: center;
}

.contact-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.contact-list li {
    margin-bottom: var(--space-sm);
}

.contact-list li:last-child {
    margin-bottom: 0;
}

.contact-page main a:hover,
.contact-page main a:focus-visible,
.availability-page main a:hover,
.availability-page main a:focus-visible,
.faq-page main a:hover,
.faq-page main a:focus-visible {
    color: var(--accent-color);
}

/* FAQ disclosures */
.faq-group + .faq-group {
    margin-top: var(--space-xl);
}

.faq-item {
    max-width: 680px;
    margin: 0 auto var(--space-sm);
    border-bottom: 1px solid #333333;
}

.faq-item summary {
    color: var(--text-color);
    padding: var(--space-sm) 0;
    text-align: center;
    cursor: pointer;
}

.faq-item summary:hover,
.faq-item summary:focus-visible,
.faq-item[open] summary {
    color: var(--accent-color);
}

.faq-item summary:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 3px;
}

.faq-answer {
    color: var(--muted-text-color);
    padding: 0 var(--space-sm);
}

/* Sources page */
.sources-page main a:hover,
.sources-page main a:focus-visible {
    color: var(--accent-color);
}

.source-group + .source-group {
    margin-top: var(--space-xl);
}

.source-list {
    max-width: 680px;
    margin: 0 auto;
    padding: 0;
    list-style: none;
}

.source-list li {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid #333333;
}

.source-citation {
    margin-bottom: var(--space-xs);
}

.source-description,
.source-note {
    color: var(--muted-text-color);
}

.source-list li:last-child {
    margin-bottom: 0;
}

/* Responsive overrides */
@media (max-width: 700px) {
    .brand-mark {
        flex-direction: column;
        gap: var(--space-xs);
        margin-bottom: 0;
        transform: none;
    }

    .site-logo {
        transform: none;
    }

    .content {
        padding: var(--space-md) 14px;
    }

    h1 {
        font-size: 2.4rem;
        margin-bottom: var(--space-lg);
    }

    h2.page-title {
        font-size: 1.4rem;
        margin-top: var(--space-xl);
    }

    h2.section-title,
    h3.section-title {
        font-size: 1.15rem;
        margin-top: var(--space-xl);
    }

    .tagline {
        margin-bottom: 22px;
    }

    .navigation {
        gap: var(--space-xs) 12px;
        margin-bottom: 14px;
    }

    .navigation a {
        font-size: 0.85rem;
    }

    p {
        margin-bottom: 14px;
    }

    .gallery-item {
        margin-bottom: var(--space-3xl);
    }

    .gallery-item img {
        width: min(280px, 80vw);
    }

    .lightbox-image-button {
        --zoom-scale: 1.5;
    }
}