@import "./tokens.css";

* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 120%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  background: var(--px-bg-0);
  color: var(--px-text);
  font-family: var(--px-font);
  font-size-adjust: var(--px-font-adjust);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--px-accent); }
a:hover { color: #ffd88a; }

:focus-visible {
  outline: 2px solid var(--px-accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10;
  padding: 0.5rem 1rem;
  background: var(--px-bg-2);
}
.skip-link:focus { left: 0; }

/* ===== TOPBAR ===== */

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: stretch;
  gap: 0 1.75rem;
  height: 3.4rem;
  padding: 0 1.5rem;
  background: var(--px-bg-1);
  border-bottom: 1px solid var(--px-edge);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-decoration: none;
  white-space: nowrap;
  color: var(--px-text);
}
.brand-sub {
  color: var(--px-accent);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
}

.topnav { display: flex; min-width: 0; }
.topnav > ul {
  display: flex;
  align-items: stretch;
  list-style: none;
}

.topnav-item { position: relative; display: flex; }

.topnav-item > a {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0 0.9rem;
  border-bottom: 2px solid transparent;
  color: var(--px-text-dim);
  font-size: 0.92rem;
  text-decoration: none;
  white-space: nowrap;
}
.topnav-item > a:hover { color: var(--px-text); }
.topnav-item > a.is-active {
  border-bottom-color: var(--px-accent);
  color: var(--px-accent);
}
.topnav-caret { font-size: 0.85em; opacity: 0.85; }

.topnav-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 6;
  min-width: 14rem;
  padding: 0.4rem 0;
  background: var(--px-bg-1);
  border: 1px solid var(--px-edge);
  border-top: none;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.45);
  list-style: none;
}
.topnav-menu a {
  display: block;
  padding: 0.4rem 1rem;
  color: var(--px-text);
  font-size: 0.9rem;
  text-decoration: none;
  white-space: nowrap;
}
.topnav-menu a:hover { background: var(--px-bg-2); color: var(--px-accent); }
.topnav-menu a.is-active { color: var(--px-accent); }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-left: auto;
}

.topbar-link {
  color: var(--px-text-dim);
  font-size: 0.88rem;
  text-decoration: none;
  white-space: nowrap;
}
.topbar-link:hover { color: var(--px-accent); }

.topbar-cta {
  padding: 0.35rem 0.85rem;
  background: var(--px-accent);
  border: 1px solid var(--px-accent-dim);
  color: var(--px-ink);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-decoration: none;
  white-space: nowrap;
}
.topbar-cta:hover { background: #ffd88a; color: var(--px-ink); }

.pager-link,
.copy-btn {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  background: var(--px-bg-2);
  border: 1px solid var(--px-edge);
  border-top-color: var(--px-edge-hi);
  box-shadow: 0 2px 0 var(--px-shadow);
  color: var(--px-text);
  font-family: inherit;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  cursor: pointer;
}
.pager-link:hover,
.copy-btn:hover {
  background: var(--px-edge);
  color: var(--px-accent);
}

@media (max-width: 59.99rem) {
  .topbar {
    flex-wrap: wrap;
    align-items: center;
    gap: 0;
    height: auto;
    padding: 0.55rem 1rem 0;
  }
  .topnav {
    order: 3;
    flex-basis: 100%;
    margin-top: 0.55rem;
    overflow-x: auto;
  }
  .topnav > ul { height: 2.5rem; }
  .topnav-menu { display: none !important; }
}

@media (min-width: 60rem) {
  .topnav-item:hover > .topnav-menu,
  .topnav-item:focus-within > .topnav-menu { display: block; }
}

/* ===== LAYOUT ===== */

.layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 96rem;
  margin: 0 auto;
  padding: 1rem 1.25rem 3rem;
}

.collapsible > summary {
  padding: 0.5rem 0.75rem;
  background: var(--px-bg-1);
  border: 1px solid var(--px-edge);
  color: var(--px-text-dim);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  list-style: none;
}
.collapsible > summary::after {
  content: " ▾";
  color: var(--px-accent);
}
.collapsible[open] > summary::after { content: " ▴"; }

.rail {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}

.sidebar nav { padding: 0.75rem 0; }

.nav-section + .nav-section { margin-top: 1.25rem; }

.nav-section-title {
  padding: 0 0.5rem 0.35rem;
  color: var(--px-text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.sidebar ul, .contents ul { list-style: none; }

.sidebar li a {
  display: block;
  padding: 0.28rem 0.5rem;
  border-left: 2px solid transparent;
  color: var(--px-text);
  font-size: 0.94rem;
  text-decoration: none;
}
.sidebar li a:hover {
  background: var(--px-bg-1);
  color: var(--px-accent);
}
.sidebar li a.is-active {
  border-left-color: var(--px-accent);
  background: var(--px-bg-1);
  color: var(--px-accent);
}

/* ===== ARTICLE ===== */

.article {
  min-width: 0;
  user-select: text;
}

article {
  max-width: 46rem;
  min-width: 0;
  padding-top: 0.5rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  color: var(--px-text-dim);
  font-size: 0.85rem;
}
.breadcrumbs .sep { color: var(--px-edge); }

article h1, article h2, article h3, article h4 {
  line-height: 1.25;
  scroll-margin-top: 5rem;
}
article h1 {
  margin: 0.75rem 0 1.25rem;
  font-size: 2.1rem;
  color: var(--px-accent);
}
article h2 {
  margin: 2.5rem 0 0.85rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--px-edge);
  font-size: 1.5rem;
}
article h3 { margin: 1.85rem 0 0.6rem; font-size: 1.2rem; }
article h4 { margin: 1.4rem 0 0.5rem; font-size: 1.02rem; color: var(--px-text-dim); }

article p, article ul, article ol, article blockquote, article .table-scroll, article pre {
  margin: 0 0 1.1rem;
}

article ul, article ol { padding-left: 1.4rem; }
article li { margin: 0.3rem 0; }
article li > ul, article li > ol { margin: 0.3rem 0; }

article blockquote {
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--px-accent);
  background: var(--px-bg-1);
  color: var(--px-text-dim);
}

article hr {
  margin: 2rem 0;
  border: none;
  border-top: 1px solid var(--px-edge);
}

article img, article svg {
  max-width: 100%;
  height: auto;
}

.heading-anchor {
  margin-left: 0.45rem;
  color: var(--px-edge);
  font-size: 0.8em;
  text-decoration: none;
  opacity: 0;
}
h1:hover .heading-anchor,
h2:hover .heading-anchor,
h3:hover .heading-anchor,
h4:hover .heading-anchor,
.heading-anchor:focus { opacity: 1; color: var(--px-accent); }

/* ===== CODE & TABLES ===== */

code, pre, kbd {
  font-family: ui-monospace, "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  font-size-adjust: none;
}

article :not(pre) > code {
  padding: 0.1em 0.35em;
  background: var(--px-sunken);
  border: 1px solid var(--px-edge);
  border-radius: 2px;
  font-size: 0.88em;
  color: #ffd88a;
}

article pre {
  position: relative;
  padding: 0.9rem 1rem;
  background: var(--px-sunken);
  border: 1px solid var(--px-edge);
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.5;
}
article pre code { color: var(--px-text); }

.copy-btn {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  padding: 0.15rem 0.5rem;
  font-size: 0.68rem;
  opacity: 0;
}
article pre:hover .copy-btn,
.copy-btn:focus-visible { opacity: 1; }

.table-scroll { overflow-x: auto; }

article table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
}
article th, article td {
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--px-edge);
  text-align: left;
  vertical-align: top;
}
article th {
  background: var(--px-bg-1);
  color: var(--px-accent);
  white-space: nowrap;
}
article tbody tr:nth-child(even) { background: rgba(255, 255, 255, 0.02); }

/* ===== CONTENTS, FOOT, PAGER ===== */

.contents-title {
  padding: 0 0.5rem 0.35rem;
  color: var(--px-text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.contents ul { padding: 0.75rem 0; }
.contents li a {
  display: block;
  padding: 0.2rem 0.5rem;
  border-left: 2px solid var(--px-edge);
  color: var(--px-text-dim);
  font-size: 0.86rem;
  text-decoration: none;
}
.contents li.depth-3 a { padding-left: 1.25rem; }
.contents li a:hover { color: var(--px-accent); border-left-color: var(--px-accent); }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  max-width: 46rem;
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--px-edge);
}
.pager-link {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  max-width: 48%;
  padding: 0.6rem 0.9rem;
}
.pager-next { text-align: right; }
.pager-label {
  color: var(--px-text-dim);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.pager-title { color: var(--px-accent); font-size: 0.95rem; }

.sitefoot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1.25rem;
  border-top: 1px solid var(--px-edge);
  color: var(--px-text-dim);
  font-size: 0.85rem;
}

/* The rail ships expanded so it never depends on how a browser hides closed <details> content;
   below the desktop breakpoint it stays collapsible and is capped so it cannot bury the article. */
@media (max-width: 59.99rem) {
  .rail {
    max-height: 45vh;
    overflow-y: auto;
  }
}

/* ===== DESKTOP ===== */

@media (min-width: 60rem) {
  .layout {
    grid-template-columns: 16rem minmax(0, 1fr);
    gap: 2.5rem;
  }
  .rail {
    position: sticky;
    top: 5rem;
    align-self: start;
    max-height: calc(100vh - 7rem);
    overflow-y: auto;
    gap: 1.75rem;
  }
  .contents { border-top: 1px solid var(--px-edge); padding-top: 1.25rem; }
  .collapsible > summary { display: none; }
}