/* --- Design tokens --- */
:root {
  --bg: #f7f5f0;
  --bg-hover: #f0ede6;
  --surface: #ffffff;
  --divider: #d0cdc7;
  --text: #1a1a1a;
  --text-muted: #888888;
  --selected-bg: #1a1a1a;
  --selected-text: #ffffff;
  --font-display: Georgia, 'Times New Roman', serif;
  --font-ui: 'Helvetica Neue', Arial, sans-serif;
  --space-page: 2rem;
  --transition: 250ms ease;
}

/* --- Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
}

/* --- Nav --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem var(--space-page);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.nav--scrolled {
  border-bottom-color: var(--divider);
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
}

.nav__name {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  gap: 2rem;
}

.nav__links a {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  transition: color var(--transition);
}

.nav__links a:hover {
  color: var(--text);
}

/* --- Hero --- */
.hero {
  padding: 2.5rem var(--space-page) 0;
}

.hero__tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.hero__description {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 420px;
  line-height: 1.6;
}

.hero__rule {
  border: none;
  border-top: 1px solid var(--divider);
  margin-top: 1.75rem;
}

/* --- Filter bar --- */
.filter {
  display: flex;
  gap: 1.5rem;
  padding: 1rem var(--space-page);
}

.filter__tab {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.filter__tab:hover {
  color: var(--text);
}

.filter__tab--active {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* --- Gallery --- */
.gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--divider);
  border-top: 1px solid var(--divider);
}

.card {
  background: var(--bg);
  padding: 1.25rem var(--space-page);
  cursor: pointer;
  transition: background var(--transition);
}

.card:hover {
  background: var(--bg-hover);
}

.card--selected {
  background: var(--selected-bg);
  color: var(--selected-text);
}

.card--selected .card__tag {
  color: rgba(255, 255, 255, 0.45);
}

.card.hidden {
  display: none;
}

.gallery--has-selection .card:not(.card--selected) {
  opacity: 0.4;
}

.card__thumb {
  aspect-ratio: 16 / 10;
  border-radius: 3px;
  margin-bottom: 0.875rem;
}

.card__title {
  font-size: 0.875rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.card__tag {
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

/* --- Expand panel --- */
.expand-panel {
  grid-column: 1 / -1;
  background: var(--surface);
  border-top: 2px solid var(--text);
  border-bottom: 1px solid var(--divider);
  padding: 1.5rem var(--space-page);
  animation: panel-in var(--transition) forwards;
}

@keyframes panel-in {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.expand-panel__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}

.expand-panel__title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.125rem;
}

.expand-panel__subtitle {
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.expand-panel__close {
  font-size: 0.75rem;
  color: var(--text-muted);
  border: 1px solid var(--divider);
  border-radius: 2px;
  padding: 0.25rem 0.625rem;
  transition: color var(--transition), border-color var(--transition);
  white-space: nowrap;
}

.expand-panel__close:hover {
  color: var(--text);
  border-color: var(--text);
}

.expand-panel__content {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.expand-panel__image {
  flex: 1.2;
  aspect-ratio: 16 / 9;
  border-radius: 3px;
  min-width: 0;
}

.expand-panel__details {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.expand-panel__block {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.expand-panel__label {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.expand-panel__block p {
  font-size: 0.8125rem;
  line-height: 1.6;
}

.expand-panel__link {
  display: inline-block;
  font-size: 0.8125rem;
  border-bottom: 1px solid var(--text);
  padding-bottom: 1px;
  margin-top: 0.5rem;
  transition: opacity var(--transition);
}

.expand-panel__link:hover {
  opacity: 0.6;
}

/* --- About --- */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  padding: 3rem var(--space-page);
  border-top: 1px solid var(--divider);
  margin-top: 3rem;
}

.about__bio p {
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 38ch;
}

.about__resume {
  display: inline-block;
  margin-top: 1.25rem;
  font-size: 0.8125rem;
  border-bottom: 1px solid var(--text);
  padding-bottom: 1px;
  transition: opacity var(--transition);
}

.about__resume:hover {
  opacity: 0.6;
}

.about__skills {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-top: 0.125rem;
}

.about__skills li {
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--divider);
}

/* --- Footer --- */
.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem var(--space-page);
  border-top: 1px solid var(--divider);
  margin-top: 1px;
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__links a {
  font-size: 0.8125rem;
  border-bottom: 1px solid var(--text);
  padding-bottom: 1px;
  transition: opacity var(--transition);
}

.footer__links a:hover {
  opacity: 0.6;
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  :root {
    --space-page: 1.25rem;
  }

  .gallery {
    grid-template-columns: 1fr;
  }

  .expand-panel__content {
    flex-direction: column;
  }

  .expand-panel__image {
    width: 100%;
    flex: none;
  }

  .about {
    grid-template-columns: 1fr;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}