/* Palette: soft white foundation, charcoal text/UI, dark blue interactions. */
:root {
  color-scheme: light;
  --page: #f8f9fa;
  --ink: #2d3137;
  --muted: #535b65;
  --accent: #173b63;
  --accent-hover: #102d4e;
  --line: #d2d7dd;
  --subtle: #eef0f3;
  --header-offset: 104px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: var(--header-offset); scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--page); font-size: 16px; line-height: 1.7; }
h1, h2, h3, h4, p, ul, dl, dd { margin: 0; }
h1, h2, h3, h4 { line-height: 1.35; font-weight: 650; }
a { color: var(--accent); text-underline-offset: 4px; }
a:hover { color: var(--accent-hover); text-decoration-thickness: 2px; }
button { font: inherit; }
a:focus-visible, button:focus-visible, summary:focus-visible, [role="tabpanel"]:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
.container { width: min(1000px, calc(100% - 64px)); margin-inline: auto; }
.meta, .tools, .placeholder { color: var(--muted); font-size: .85rem; }
.example { color: #3d444c; font-size: .94rem; }
.skip-link { position: fixed; z-index: 10; top: 8px; left: 12px; transform: translateY(-160%); padding: 8px 14px; color: var(--page); background: var(--accent); }
.skip-link:focus { transform: translateY(0); }

/* Header and introduction */
.site-header { position: sticky; top: 0; z-index: 5; background: var(--page); border-bottom: 2px solid var(--ink); }
.header-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; min-height: 84px; padding-block: 12px; }
.site-name { color: var(--ink); font-size: 1.15rem; font-weight: 750; text-decoration: none; }
nav { display: flex; align-items: center; gap: 10px; }
nav a { display: block; padding: 10px 20px; border: 1px solid transparent; border-radius: 4px; color: var(--ink); font-size: 1rem; line-height: 1.5; font-weight: 700; text-decoration: none; }
nav a[aria-current="location"] { background: var(--ink); border-color: var(--ink); color: var(--page); }
nav a:hover { background: var(--accent); border-color: var(--accent); color: var(--page); text-decoration: none; }
.intro { padding-block: 46px 38px; max-width: 760px; }
h1 { font-size: 2rem; }
.subtitle { font-size: 1.05rem; margin-top: 7px; }
.intro > .example { margin-top: 18px; }
.contact-list { display: flex; flex-wrap: wrap; gap: 8px 24px; padding: 0; margin-top: 22px; list-style: none; color: var(--muted); font-size: .82rem; }

/* Projects: equal-width tabs automatically accommodate another category. */
.section { padding-block: 35px 42px; border-top: 1px solid var(--line); }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.08rem; }
h4 { font-size: 1rem; }
.centered-title { text-align: center; font-weight: 750; }
.centered-footer {text-align: center; max-width: 500px}
.project-tabs { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); gap: 12px; margin-top: 24px; }
.project-tabs button { min-width: 0; min-height: 56px; padding: 13px 18px; border: 1px solid var(--ink); border-radius: 3px; background: var(--subtle); color: var(--ink); font-size: 1rem; font-weight: 700; line-height: 1.4; cursor: pointer; }
.project-tabs button[aria-selected="true"] { background: var(--ink); color: var(--page); }
.project-tabs button:hover { background: var(--accent); border-color: var(--accent); color: var(--page); }
.project-group { margin-top: 26px; }
.project-group > h3 { padding: 13px 18px; background: var(--ink); color: var(--page); font-size: 1.15rem; font-weight: 700; }
.project { display: grid; grid-template-columns: 245px minmax(0, 1fr); gap: 36px; padding-block: 24px; border-bottom: 1px solid var(--line); }
.project-heading .meta { margin-top: 6px; }
.tools { margin-top: 10px; font-size: .78rem; line-height: 1.7; }
.project-copy > .placeholder { margin-top: 12px; }
.project-copy details { margin-top: 12px; }
summary { width: fit-content; max-width: 100%; cursor: pointer; color: var(--accent); font-size: .85rem; padding-block: 5px; }
summary:hover { color: var(--accent-hover); text-decoration: underline; text-underline-offset: 4px; }
details dl { padding: 14px 18px; margin-top: 8px; background: var(--subtle); border-left: 3px solid var(--ink); }
details dt { font-weight: 650; font-size: .85rem; }
details dd { color: var(--muted); font-size: .85rem; margin-top: 5px; }
details dt:not(:first-child) { margin-top: 14px; }
.undated-heading { margin-top: 28px; font-size: .92rem; color: var(--muted); }
.date-note { margin-block: 8px 4px; font-size: .82rem; color: var(--muted); }

/* Experience, education, and skills */
.experience-entry { padding-top: 25px; }
.experience-entry + .experience-entry { margin-top: 24px; border-top: 1px solid var(--line); }
.entry-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 8px 24px; }
.entry-heading .meta { flex-shrink: 0; }
.experience-entry > .placeholder { margin-top: 7px; }
.experience-entry > .example { margin-top: 12px; max-width: 850px; }
.about-intro { margin-top: 18px; max-width: 850px; }
.background-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 60px; margin-top: 30px; }
.education-entry { margin-top: 18px; }
.education-entry p { font-size: .85rem; margin-top: 5px; }
.skills { margin-top: 18px; }
.skills dt { font-weight: 650; font-size: .85rem; }
.skills dd { color: var(--muted); font-size: .85rem; margin-top: 4px; }
.skills dt:not(:first-child) { margin-top: 16px; }
.site-footer { border-top: 2px solid var(--ink); }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; padding-block: 20px; font-size: .8rem; color: var(--muted); }

/* Narrow layouts: category buttons stay side by side. */
@media (max-width: 700px) {
  .container { width: calc(100% - 40px); }
  .header-inner { padding-block: 12px; justify-content: center; gap: 12px; }
  .site-name { width: 100%; text-align: center; }
  nav { width: 100%; gap: 8px; }
  nav a { flex: 1; padding: 10px 12px; text-align: center; font-size: .95rem; }
  .intro { padding-block: 32px; }
  h1 { font-size: 1.75rem; }
  .section { padding-block: 28px 32px; }
  .project { grid-template-columns: 1fr; gap: 14px; padding-block: 22px; }
  .project-tabs { gap: 10px; }
  .project-tabs button { padding-inline: 12px; font-size: .92rem; }
  .tools { margin-top: 5px; }
  .entry-heading { flex-direction: column; gap: 5px; }
  .entry-heading .meta { flex-shrink: 1; }
  .background-grid { grid-template-columns: 1fr; gap: 30px; }
}
@media (max-width: 420px) {
  .container { width: calc(100% - 32px); }
  nav a { padding-inline: 8px; font-size: .9rem; }
  .contact-list { gap: 5px 16px; }
  .project-tabs button { padding-inline: 8px; }
}

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

#experience.section {
  border-top: none;
}

:root {
  --project-duration: 360ms;
  --project-easing: cubic-bezier(.22, .61, .36, 1);
}

/* Sliding background behind the selected button */
.project-tabs {
  position: relative;
  isolation: isolate;
}

.project-tabs::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--tab-width, 0px);
  transform: translateX(var(--tab-x, 0px));
  background: var(--ink);
  border-radius: 3px;
  pointer-events: none;
  z-index: 0;
}

.project-tabs button {
  position: relative;
  z-index: 1;
  background: transparent;
}

.project-tabs button:hover {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.project-tabs button[aria-selected="true"],
.project-tabs button[aria-selected="true"]:hover {
  background: transparent;
  color: var(--page);
  border-color: var(--ink);
}

.project-tabs.glide-ready::before {
  transition:
    transform var(--project-duration) var(--project-easing),
    width var(--project-duration) var(--project-easing);
}

.project-tabs.glide-ready button {
  transition:
    color var(--project-duration) var(--project-easing),
    border-color var(--project-duration) var(--project-easing);
}

.project-viewport {
  margin-top: 26px;
  overflow: clip;
  overflow-anchor: none;
}

.project-track {
  display: flex;
  align-items: flex-start;
}

.project-track > .project-group {
  flex: 0 0 100%;
  min-width: 0;
  margin-top: 0;
}

.project-track > .project-group:focus-visible {
  outline-offset: -3px;
}

.project-viewport.glide-ready {
  transition: height var(--project-duration) var(--project-easing);
}

.project-viewport.glide-ready .project-track {
  transition: transform var(--project-duration) var(--project-easing);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --project-duration: 0ms;
  }
}