/* =====================================================
    PAGE HEADER
===================================================== */
.page-header {
  padding-block: var(--sp-xl) var(--sp-lg);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

[data-theme="light"] .page-header {
  background: linear-gradient(150deg, var(--teal-pale) 0%, var(--bg) 60%);
}
[data-theme="dark"] .page-header {
  background: linear-gradient(150deg, var(--teal-dim) 0%, var(--bg) 60%);
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Ccircle cx='30' cy='30' r='1.5' fill='%232A8B84' fill-opacity='.1'/%3E%3C/svg%3E");
  pointer-events: none;
  opacity: .65;
}

.page-header-inner { position: relative; }

.breadcrumb {
  display: flex;
  align-items: center;
  gap: .4rem;
  margin-bottom: var(--sp-md);
  font-size: var(--t-xs);
  font-weight: 500;
  color: var(--text-muted);
}

.breadcrumb a { color: var(--text-soft); text-decoration: none; transition: color .15s; }
.breadcrumb a:hover { color: var(--teal); }
.breadcrumb-sep { color: var(--border-strong); font-size: .75em; user-select: none; }
.breadcrumb [aria-current="page"] { color: var(--teal-dark); }
[data-theme="dark"] .breadcrumb [aria-current="page"] { color: var(--teal); }

.page-kicker {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--accent-dark);
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  padding: .3rem .85rem;
  border-radius: var(--r-pill);
  width: fit-content;
  margin-bottom: var(--sp-sm);
}
[data-theme="dark"] .page-kicker { color: var(--accent-dark); }

.page-title {
  font-family: var(--f-display);
  font-size: var(--t-2xl);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--text-primary);
}

.page-title em { font-style: italic; color: var(--teal); }

.page-subtitle {
  margin-top: var(--sp-sm);
  font-size: var(--t-md);
  color: var(--text-soft);
  max-width: 54ch;
  line-height: 1.65;
}

/* =====================================================
    LAYOUT
===================================================== */
.page-body { padding-block: var(--sp-xl); }

.page-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-xl);
  align-items: start;
}

@media (min-width: 900px) {
  .page-layout { grid-template-columns: 210px 1fr; gap: clamp(2rem, 5vw, 4rem); }
}

/* =====================================================
    SIDEBAR TOC
===================================================== */
.toc { position: sticky; top: calc(64px + var(--sp-md)); }

.toc-heading {
  font-size: var(--t-xs);
  font-weight: 600;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: .75rem;
}

.toc-list {
  display: flex;
  flex-direction: column;
  border-left: 2px solid var(--border);
}

.toc-list a {
  display: block;
  font-size: var(--t-sm);
  color: var(--text-soft);
  text-decoration: none;
  padding: .28rem 0 .28rem 1rem;
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: color .15s, border-color .15s;
  line-height: 1.4;
}

.toc-list a:hover { color: var(--teal); border-left-color: var(--teal-mid); }

.toc-era {
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  padding: .65rem 0 .2rem 1rem;
  line-height: 1;
}

.toc-era--edu  { color: var(--teal-dark); }
.toc-era--pysi { color: var(--accent-dark); }
[data-theme="dark"] .toc-era--edu  { color: var(--teal); }
[data-theme="dark"] .toc-era--pysi { color: var(--accent-mid); }

@media (max-width: 899px) { .toc { display: none; } }

/* =====================================================
    CHANGELOG CONTENT
===================================================== */
.changelog { max-width: 72ch; }

.era { margin-bottom: var(--sp-2xl); }

.era-divider {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  margin-bottom: var(--sp-lg);
  padding-bottom: var(--sp-md);
  border-bottom: 2px solid var(--border);
}

/* Era label pills */
.era-pill {
  font-family: var(--f-body);
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: #fff;
  padding: .3rem .85rem;
  border-radius: var(--r-pill);
  white-space: nowrap;
  flex-shrink: 0;
}

.era-pill--edu  { background: var(--teal-dark); }
.era-pill--pysi { background: var(--accent-dark); }
.era-pill--old  { background: var(--text-soft); }

[data-theme="dark"] .era-pill--edu  { background: var(--teal); color: var(--bg); }
[data-theme="dark"] .era-pill--pysi { background: var(--accent-mid); color: var(--bg); }
[data-theme="dark"] .era-pill--old  { background: var(--text-soft); color: var(--bg); }

.era-heading {
  font-family: var(--f-display);
  font-size: var(--t-lg);
  font-weight: 400;
  letter-spacing: -.01em;
  color: var(--text-primary);
  line-height: 1.2;
}

.era-note { font-size: var(--t-sm); color: var(--text-muted); margin-top: .2rem; }

/* =====================================================
    RELEASE ROW
===================================================== */
.release {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 0 var(--sp-md);
  margin-bottom: var(--sp-lg);
  position: relative;
}

@media (max-width: 540px) { .release { grid-template-columns: 1fr; gap: var(--sp-xs) 0; } }

/* Vertical connector line between releases */
.release:not(:last-child) .rmeta::after {
  content: '';
  position: absolute;
  left: 125px;
  top: 18px;
  bottom: calc(-7px - var(--sp-lg));
  width: 2px;
  background: var(--border);
}

@media (max-width: 540px) { .release:not(:last-child) .rmeta::after { display: none; } }

.rmeta { position: relative; padding-top: .15rem; }

/* Version badge */
.vbadge {
  font-family: var(--f-mono);
  font-size: var(--t-xs);
  font-weight: 500;
  padding: .2rem .55rem;
  border-radius: var(--r-md);
  display: inline-block;
  margin-bottom: .3rem;
  white-space: nowrap;
}

.vbadge--edu  { color: var(--icon-teal-fg);   background: var(--icon-teal-bg);   border: 1px solid var(--teal-border); }
.vbadge--pysi { color: var(--icon-orange-fg); background: var(--icon-orange-bg); border: 1px solid var(--accent-border); }
.vbadge--old  { color: var(--text-soft);      background: var(--bg-raised);      border: 1px solid var(--border); }

/* Timeline dot */
.rdot {
  position: absolute;
  right: -1px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 2px solid var(--bg);
  z-index: 1;
}

.rdot--edu  { background: var(--teal); }
.rdot--pysi { background: var(--accent); }
.rdot--old  { background: var(--border-strong); }

@media (max-width: 540px) { .rdot { display: none; } }

.rdate {
  font-size: var(--t-xs);
  color: var(--text-muted);
  font-weight: 500;
  display: block;
  line-height: 1.4;
}

.rtitle {
  font-weight: 600;
  font-size: var(--t-base);
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: .4rem;
}

/* =====================================================
    RELEASE TAGS
===================================================== */
.tags { margin-bottom: .5rem; display: flex; flex-wrap: wrap; gap: .3rem; }

.tag {
  font-size: var(--t-xs);
  font-weight: 600;
  padding: .1rem .5rem;
  border-radius: var(--r-pill);
}

.tag-new   { background: var(--icon-teal-bg);   color: var(--icon-teal-fg);   border: 1px solid var(--teal-border); }
.tag-fix   { background: var(--icon-orange-bg); color: var(--icon-orange-fg); border: 1px solid var(--accent-border); }
.tag-maint { background: var(--icon-stone-bg);  color: var(--icon-stone-fg);  border: 1px solid var(--border); }
.tag-first { background: var(--text-primary);   color: var(--bg); }

/* "Latest" inline badge */
.latest-tag {
  display: inline-flex;
  align-items: center;
  font-size: var(--t-xs);
  font-weight: 700;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--icon-teal-fg);
  background: var(--icon-teal-bg);
  border: 1px solid var(--teal-border);
  padding: .15rem .55rem;
  border-radius: var(--r-pill);
  margin-left: .5rem;
  vertical-align: middle;
}

/* =====================================================
    CHANGE LIST
===================================================== */
.changes { display: flex; flex-direction: column; gap: .4rem; }

.change {
  display: flex;
  align-items: flex-start;
  gap: .65rem;
  font-size: var(--t-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

.change::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border-strong);
  flex-shrink: 0;
  margin-top: .52em;
}

/* Inline code within change items */
.change code {
  font-family: var(--f-mono);
  font-size: .9em;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: .1em .4em;
  border-radius: var(--r-sm);
  border: 1px solid var(--teal-border);
}

/* =====================================================
    CHANGELOG FOOTER LINKS
===================================================== */
.cl-footer {
  border-top: 1px solid var(--border);
  padding-top: var(--sp-lg);
  margin-top: var(--sp-sm);
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
}