/* ─── Colour tokens ─────────────────────────────────── */
:root {
  --pb-bg:          #FFFFFF;
  --pb-surface:     #FFFFFF;
  --pb-card:        #FFFFFF;
  --pb-border:      #D4CFC4;
  --pb-text:        #1A1A1A;
  --pb-muted:       #666666;
  --pb-orange:      #C0522A;
  --pb-orange-lt:   #FFF0E8;
  --pb-orange-mid:  #F5D5C0;
  --pb-blue:        #2F5496;
  --pb-blue-lt:     #EAF0FB;
  --pb-blue-mid:    #C0D0EE;
  --pb-green:       #2E7D32;
  --pb-green-lt:    #E8F5E9;
  --pb-red:         #B03020;
  --pb-red-lt:      #FDECEA;
  --pb-purple:      #6A3D8F;
  --pb-purple-lt:   #F3EEF8;

  /* Material overrides */
  --md-primary-fg-color:          #2F5496;
  --md-primary-fg-color--light:   #4A72C0;
  --md-primary-fg-color--dark:    #1A3362;
  --md-accent-fg-color:           #C0522A;
  --md-accent-fg-color--transparent: rgba(192,82,42,0.1);
  --md-default-bg-color:          #FFFFFF;
  --md-default-fg-color:          #1A1A1A;
  --md-default-fg-color--light:   #666666;
  --md-default-fg-color--lighter: #999999;
  --md-code-bg-color:             #EFF2F8;
  --md-code-fg-color:             #1A1A1A;
  --md-typeset-a-color:           #2F5496;
}

[data-md-color-scheme="slate"] {
  --pb-bg:        #1C1A16;
  --pb-surface:   #26231E;
  --pb-card:      #2E2A24;
  --pb-border:    #423E38;
  --pb-text:      #EDE8E0;
  --pb-muted:     #9A9590;
  --pb-blue-lt:   #1A2A44;
  --pb-orange-lt: #321A0E;
  --pb-green-lt:  #142018;
  --pb-red-lt:    #2E1210;
  --pb-purple-lt: #231530;
 
  --md-default-bg-color:  #1C1A16;
  --md-default-fg-color:  #EDE8E0;
  --md-code-bg-color:     #26231E;
  --md-typeset-table-color: rgba(255,255,255,0.05);
}
 
/* ─── Base ───────────────────────────────────────────── */
.md-main { background: var(--pb-bg); }
.md-content { background: var(--pb-bg); }
.md-sidebar--secondary { background: var(--pb-bg); }
 
/* ─── Header & Tabs ──────────────────────────────────── */
.md-header {
  background: #1E3A78 !important;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.md-header__title { font-weight: 700; letter-spacing: 0.02em; }
.md-tabs { background: #26478A !important; }
.md-tabs__link { font-weight: 500; opacity: 0.85; }
.md-tabs__link--active, .md-tabs__link:hover { opacity: 1; }
 
/* ─── Navigation sidebar ─────────────────────────────── */
.md-nav__title { font-weight: 700; color: var(--pb-blue); }
.md-nav__link--active { color: var(--pb-orange) !important; font-weight: 600; }
.md-nav__link:hover { color: var(--pb-orange); }
.md-nav__item--section > .md-nav__link {
  font-weight: 700;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--pb-muted);
}
 
/* ─── Headings ───────────────────────────────────────── */
.md-typeset h1 {
  font-weight: 800;
  color: var(--pb-text);
  border-bottom: 3px solid var(--pb-orange);
  padding-bottom: 0.4em;
  margin-bottom: 1.2em;
  font-size: 2rem;
}
.md-typeset h2 {
  font-weight: 700;
  color: var(--pb-blue);
  font-size: 1.35rem;
  margin-top: 2.2em;
}
.md-typeset h3 {
  font-weight: 600;
  color: var(--pb-text);
  font-size: 1.1rem;
}
 
/* ─── Inline code ────────────────────────────────────── */
.md-typeset code {
  background: var(--pb-blue-lt);
  color: var(--pb-blue);
  border-radius: 4px;
  font-size: 0.87em;
  padding: 0.1em 0.4em;
  font-weight: 500;
}
.md-typeset pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-weight: 400;
}
 
/* ─── Code blocks ────────────────────────────────────── */
.md-typeset .highlight,
.md-typeset pre {
  border-radius: 8px !important;
  border: 1px solid var(--pb-border);
}
.md-typeset .highlight .filename {
  background: var(--pb-blue);
  color: white;
  font-weight: 600;
  border-radius: 8px 8px 0 0;
  border: none;
}
 
/* ─── Tables ─────────────────────────────────────────── */
.md-typeset table:not([class]) {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--pb-border);
  font-size: 0.9em;
  width: 100%;
}
.md-typeset table:not([class]) th {
  background: var(--pb-blue);
  color: white;
  font-weight: 700;
  padding: 0.65em 1em;
  border: none;
}
.md-typeset table:not([class]) td {
  padding: 0.5em 1em;
  border: none;
  border-top: 1px solid var(--pb-border);
}
.md-typeset table:not([class]) tr:nth-child(even) td {
  background: var(--pb-surface);
}
.md-typeset table:not([class]) tr:hover td {
  background: var(--pb-blue-lt);
}
 
/* ─── Admonitions ────────────────────────────────────── */
.md-typeset .admonition,
.md-typeset details {
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  border-left-width: 4px;
  margin: 1.4em 0;
}
.md-typeset .admonition-title,
.md-typeset summary {
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
 
/* ─── Custom admonition: problem ────────────────────── */
.md-typeset .admonition.problem { border-color: var(--pb-blue); background: var(--pb-blue-lt); }
.md-typeset .problem > .admonition-title { background: rgba(47,84,150,0.12); color: var(--pb-blue); }
.md-typeset .problem > .admonition-title::before {
  background-color: var(--pb-blue);
  -webkit-mask-image: var(--md-admonition-icon--note);
  mask-image: var(--md-admonition-icon--note);
}
 
/* ─── Custom admonition: insight ────────────────────── */
.md-typeset .admonition.insight { border-color: var(--pb-orange); background: var(--pb-orange-lt); }
.md-typeset .insight > .admonition-title { background: rgba(192,82,42,0.10); color: var(--pb-orange); }
.md-typeset .insight > .admonition-title::before {
  background-color: var(--pb-orange);
  -webkit-mask-image: var(--md-admonition-icon--tip);
  mask-image: var(--md-admonition-icon--tip);
}
 
/* ─── Custom admonition: quickref ───────────────────── */
.md-typeset details.quickref {
  border-color: var(--pb-purple);
  background: var(--pb-purple-lt);
}
.md-typeset details.quickref > summary {
  background: rgba(106,61,143,0.10);
  color: var(--pb-purple);
  font-weight: 700;
}
.md-typeset details.quickref > summary::before {
  background-color: var(--pb-purple);
  -webkit-mask-image: var(--md-admonition-icon--abstract);
  mask-image: var(--md-admonition-icon--abstract);
}
 
/* ─── IO Example boxes ───────────────────────────────── */
.pb-io {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.2rem 0 1.6rem;
}
@media (max-width: 600px) { .pb-io { grid-template-columns: 1fr; } }
 
.pb-io-block {
  background: var(--pb-card);
  border: 1px solid var(--pb-border);
  border-radius: 8px;
  overflow: hidden;
}
.pb-io-block.input  { border-top: 3px solid var(--pb-blue); }
.pb-io-block.output { border-top: 3px solid var(--pb-green); }
 
.pb-io-label {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.35rem 0.9rem;
  color: white;
  display: block;
}
.pb-io-block.input  .pb-io-label { background: var(--pb-blue); }
.pb-io-block.output .pb-io-label { background: var(--pb-green); }
 
.pb-io-block pre {
  margin: 0 !important;
  padding: 0.75rem 1rem !important;
  background: transparent !important;
  border: none !important;
  border-radius: 0 !important;
  font-size: 0.87rem !important;
  line-height: 1.6 !important;
  box-shadow: none !important;
}
 
/* ─── Takeaway cards ─────────────────────────────────── */
.pb-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.pb-card {
  background: var(--pb-card);
  border: 1px solid var(--pb-border);
  border-top: 3px solid var(--pb-blue);
  border-radius: 8px;
  padding: 1.1rem 1.3rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.pb-card-num {
  font-size: 0.68rem;
  font-weight: 800;
  color: var(--pb-orange);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}
.pb-card h4 {
  margin: 0 0 0.5rem;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--pb-blue);
}
.pb-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--pb-muted);
  line-height: 1.6;
}
 
/* ─── Slides download button ─────────────────────────── */
.pb-downloads { margin: 1rem 0 1.6rem; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.pb-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 6px;
  padding: 0.45rem 1rem;
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none !important;
  transition: filter 0.15s, transform 0.1s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  line-height: 1;
}
.pb-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.pb-btn-slides { background: var(--pb-orange); color: white !important; }
.pb-btn-repo   { background: #24292E;       color: white !important; }
 
/* ─── Step trace table highlight ────────────────────── */
.md-typeset table tr.highlight-row td {
  background: var(--pb-green-lt) !important;
  font-weight: 700;
}
.md-typeset table td.odd-pos  { background: var(--pb-orange-lt); color: var(--pb-red); }
.md-typeset table td.even-pos { background: var(--pb-surface); color: var(--pb-muted); }
.md-typeset table td.final    { background: var(--pb-green-lt); color: var(--pb-green); font-weight: 700; }
 
/* ─── Banner (home page) ─────────────────────────────── */
.pb-banner {
  background: var(--pb-blue-lt);
  border-left: 4px solid var(--pb-blue);
  border-radius: 0 10px 10px 0;
  padding: 1.4rem 1.8rem;
  margin-bottom: 1.8rem;
}
.pb-banner-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--pb-blue);
  margin-bottom: 0.35rem;
}
.pb-banner-sub {
  font-size: 0.88rem;
  color: var(--pb-muted);
}
 
/* ─── Exam set cards on index pages ─────────────────── */
.pb-set-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
  margin: 1.5rem 0;
}
.pb-set-card {
  background: var(--pb-card);
  border: 1px solid var(--pb-border);
  border-radius: 10px;
  padding: 1.4rem 1.6rem;
  box-shadow: 0 1px 5px rgba(0,0,0,0.06);
  transition: box-shadow 0.2s, transform 0.15s;
  text-decoration: none !important;
  color: var(--pb-text) !important;
  display: block;
}
.pb-set-card:hover {
  box-shadow: 0 4px 16px rgba(47,84,150,0.15);
  transform: translateY(-2px);
}
.pb-set-card-label {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--pb-orange);
  margin-bottom: 0.35rem;
}
.pb-set-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--pb-blue);
  font-weight: 700;
}
.pb-set-card p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--pb-muted);
  line-height: 1.55;
}
.pb-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 20px;
  margin-right: 0.3rem;
  margin-top: 0.6rem;
}
.pb-badge-done  { background: var(--pb-green-lt); color: var(--pb-green); }
.pb-badge-soon  { background: var(--pb-orange-lt); color: var(--pb-orange); }
 
/* ─── Step annotation blockquote ────────────────────── */
.md-typeset blockquote {
  border-left: 4px solid var(--pb-orange);
  background: var(--pb-orange-lt);
  border-radius: 0 8px 8px 0;
  padding: 0.6rem 1rem;
  color: var(--pb-orange);
  font-style: normal;
  font-size: 0.9rem;
}
 
/* ─── Footer ─────────────────────────────────────────── */
.md-footer { background: #1E3A78; }
.md-footer-meta { background: #152B5E; }