/* ── Design tokens ───────────────────────────────────────────────────────── */
:root {
  --color-bg:      #ffffff;
  --color-surface: #f7f7f5;
  --color-text:    #1a1a1a;
  --color-muted:   #6b6b6b;
  --color-border:  #e8e8e6;

  --font: "Helvetica Neue", Helvetica, Arial, sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;

  --max-w:    1200px;
  --col-gap:  2rem;

  --ease: 200ms ease;
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a   { color: inherit; text-decoration: none; }

/* ── Layout ──────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

/* ── Header ──────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}
.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-sm);
  padding-block: var(--space-sm);
}
.site-header__brand {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.site-header__name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.2;
}
.site-header__role {
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.site-nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}
.site-nav a {
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: border-color var(--ease);
}
.site-nav a:hover { border-color: var(--color-muted); }
.site-nav .nav-icon { display: flex; align-items: center; gap: 0.35rem; }
.site-nav svg { width: 1rem; height: 1rem; flex-shrink: 0; }

/* ── Footer ──────────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-md);
  margin-top: var(--space-xl);
}
.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--color-muted);
}

/* ── Inline link ─────────────────────────────────────────────────────────── */
.inline-link {
  border-bottom: 1px solid var(--color-border);
  transition: border-color var(--ease);
}
.inline-link:hover { border-color: var(--color-text); }

/* ══════════════════════════════════════════════════════════════════════════
   INDEX PAGE
══════════════════════════════════════════════════════════════════════════ */

main { padding-block: var(--space-xl); }
main:has(.project-mantle) { padding-top: 0; }

/* Intro */
.intro {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--col-gap);
  margin-bottom: var(--space-xl);
}
.intro__label { grid-column: 2 / 4; padding-top: 0.25rem; }
.intro__label h2 { font-size: 1.5rem; font-weight: 600; line-height: 1.2; }
.intro__label h3 { font-size: 1rem; font-weight: 400; color: var(--color-muted); }
.intro__body { grid-column: 4 / 10; }
.intro__body p { font-size: 1rem; color: var(--color-muted); margin-bottom: 1em; }
.intro__body p:last-child { margin-bottom: 0; }

/* Work sections */
.work-section { margin-bottom: var(--space-lg); }
.work-section__header {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--col-gap);
  margin-bottom: var(--space-md);
}
.work-section__title {
  grid-column: 2 / 5;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.work-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--col-gap);
  row-gap: var(--space-lg);
}
.work-card         { grid-column: span 3; }
.work-card--start  { grid-column: 2 / span 3; }

/* Card */
.card { display: block; }
.card__thumb {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-surface);
  margin-bottom: var(--space-xs);
}
.card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms ease, opacity var(--ease);
}
.card:hover .card__thumb img { transform: scale(1.03); opacity: 0.88; }
.card__title { font-size: 0.875rem; font-weight: 500; letter-spacing: 0.01em; }

/* ══════════════════════════════════════════════════════════════════════════
   PROJECT PAGES
══════════════════════════════════════════════════════════════════════════ */

/* Mantle */
.project-mantle {
  width: 100%;
  height: 420px;
  overflow: hidden;
  background: var(--color-surface);
}
.project-mantle img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

/* Project content grid */
.project-content {
  padding-block: var(--space-lg);
}
.project-content__inner {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--col-gap);
}

.project-sidebar {
  grid-column: 2 / 5;
}
.project-sidebar__back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: var(--space-md);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.project-sidebar__back:hover { color: var(--color-text); border-color: var(--color-muted); }

.project-sidebar h1 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--space-md);
}

.skills-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--space-xs);
}
.skills-list {
  list-style: none;
  margin-bottom: var(--space-md);
}
.skills-list li {
  font-size: 0.875rem;
  color: var(--color-muted);
  padding-block: 0.2rem;
  border-bottom: 1px solid var(--color-border);
}
.skills-list li:first-child { border-top: 1px solid var(--color-border); }

.project-body {
  grid-column: 5 / 11;
}
.project-body p {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 1.25em;
  line-height: 1.7;
}
.project-body p:last-child { margin-bottom: 0; }

/* Stats */
.project-stats {
  margin-top: var(--space-md);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
}
.project-stats__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.project-stats__list li {
  font-size: 0.875rem;
  color: var(--color-muted);
  padding-left: 1rem;
  border-left: 2px solid var(--color-text);
}

/* Artifacts */
.project-artifacts {
  padding-bottom: var(--space-lg);
}
.project-artifacts__inner {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--col-gap);
}
.artifacts-label {
  grid-column: 2 / 5;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  padding-top: 0.25rem;
}
.artifacts-grid {
  grid-column: 5 / 11;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.artifacts-grid img {
  width: 100%;
  border: 1px solid var(--color-border);
}
.artifacts-note {
  grid-column: 5 / 11;
  font-size: 0.875rem;
  color: var(--color-muted);
}

/* Related projects */
.project-related {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}
.project-related__inner {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: var(--col-gap);
}
.related-label {
  grid-column: 2 / 5;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.related-grid {
  grid-column: 2 / 12;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: var(--col-gap);
  margin-top: var(--space-md);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  /* Index */
  .intro { grid-template-columns: 1fr; }
  .intro__label, .intro__body { grid-column: 1; }
  .intro__label { margin-bottom: var(--space-sm); }
  .work-section__header { grid-template-columns: 1fr; }
  .work-section__title  { grid-column: 1; }
  .work-grid            { grid-template-columns: repeat(2, 1fr); }
  .work-card, .work-card--start { grid-column: span 1; }

  /* Project */
  .project-mantle { height: 280px; }
  .project-content__inner { grid-template-columns: 1fr; }
  .project-sidebar { grid-column: 1; margin-bottom: var(--space-md); }
  .project-body    { grid-column: 1; }
  .project-artifacts__inner { grid-template-columns: 1fr; }
  .artifacts-label { grid-column: 1; margin-bottom: var(--space-sm); }
  .artifacts-grid, .artifacts-note { grid-column: 1; }
  .project-related__inner { grid-template-columns: 1fr; }
  .related-label  { grid-column: 1; }
  .related-grid   { grid-column: 1; grid-template-columns: repeat(2, 1fr); margin-top: var(--space-sm); }
}

@media (max-width: 540px) {
  :root { --col-gap: 1rem; }
  .site-header__inner { grid-template-columns: 1fr; gap: var(--space-xs); }
  .site-nav ul { gap: var(--space-sm); }
  .work-grid    { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .project-mantle { height: 200px; }
}