/* ============================================================
   Gujuri Alekha | Blog
   Implements DESIGN.md ("editorial research, SaaS-grade chrome").
   Token names mirror the DESIGN.md YAML; change values there first.
   Fonts load in includes/seo_header.html; Bootstrap variables live in
   theme-light.scss / theme-dark.scss.
   ============================================================ */

/* ─────────────── 1. Tokens ─────────────── */
:root {
  --color-primary: #4F46E5;
  --color-primary-ui: #4F46E5;
  --color-primary-hover: #4338CA;
  --color-primary-subtle: #F1F0FD;
  --color-on-primary: #FFFFFF;
  --color-canvas: #FFFFFF;
  --color-canvas-glass: rgba(255, 255, 255, 0.85);
  --color-surface: #F8FAFC;
  --color-surface-raised: #F1F5F9;
  --color-hairline: #E2E8F0;
  --color-hairline-strong: #CBD5E1;
  --color-ink: #0F172A;
  --color-body: #334155;
  --color-muted: #5F6B7D;
  --color-success: #047857;
  --color-warning: #A44B08;
  --color-danger: #B91C1C;
  --tint: 8%;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Source Serif 4", Charter, Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Consolas, monospace;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --shadow-lifted: 0 1px 2px rgba(15, 23, 42, 0.04), 0 6px 16px -6px rgba(15, 23, 42, 0.10);
  --shadow-overlay: 0 16px 40px -12px rgba(15, 23, 42, 0.25);

  --container-width: 1200px;
  --prose-width: 680px;
  --nav-height: 60px;

  --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 150ms;
  --dur-base: 200ms;
}

body.quarto-dark {
  --color-primary: #A5B4FC;
  --color-primary-ui: #818CF8;
  --color-primary-hover: #C7D2FE;
  --color-primary-subtle: #1A1E29;
  --color-on-primary: #0B0D12;
  --color-canvas: #0B0D12;
  --color-canvas-glass: rgba(11, 13, 18, 0.85);
  --color-surface: #12151C;
  --color-surface-raised: #181C25;
  --color-hairline: #232836;
  --color-hairline-strong: #2F3545;
  --color-ink: #E8EAF0;
  --color-body: #B6BDCB;
  --color-muted: #8A93A6;
  --color-success: #34D399;
  --color-warning: #FBBF24;
  --color-danger: #F87171;
  --tint: 10%;
  --shadow-lifted: inset 0 1px 0 rgba(255, 255, 255, 0.05);
  --shadow-overlay: 0 16px 40px -12px rgba(0, 0, 0, 0.6);
}


/* ─────────────── 2. Base ─────────────── */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.011em;
  color: var(--color-body);
  background-color: var(--color-canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-ink);
  text-wrap: balance;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
a:hover { color: var(--color-primary-hover); }

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

::selection { background: var(--color-primary-subtle); color: var(--color-ink); }

strong, b { font-weight: 600; }

/* Shared atoms */
.eyebrow,
.meta-mono {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0;
}
.eyebrow { color: var(--color-primary); }
.meta-mono { color: var(--color-muted); }

.text-link {
  font-weight: 500;
  font-size: 14px;
}

.tag-pill,
.listing-category,
.quarto-category {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: lowercase;
  line-height: 1.4;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-body);
  border: 1px solid var(--color-hairline);
  opacity: 1;
}
.listing-category { cursor: pointer; transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out); }
.listing-category:hover { background: var(--color-primary-subtle); color: var(--color-primary); }

.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 24px; }


/* ─────────────── 3. Buttons ─────────────── */
.btn-ui {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 36px;
  padding: 0 16px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.006em;
  line-height: 1;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.btn-ui:active { transform: scale(0.98); }

.btn-ui-primary { background: var(--color-primary-ui); color: var(--color-on-primary); }
.btn-ui-primary:hover { background: var(--color-primary-hover); color: var(--color-on-primary); }
body.quarto-dark .btn-ui-primary:hover { background: var(--color-primary); }

.btn-ui-secondary { background: var(--color-canvas); color: var(--color-ink); border-color: var(--color-hairline-strong); }
.btn-ui-secondary:hover { background: var(--color-surface); color: var(--color-ink); }

.btn-ui-ghost { background: transparent; color: var(--color-body); padding: 0 12px; }
.btn-ui-ghost:hover { background: var(--color-surface-raised); color: var(--color-ink); }


/* ─────────────── 4. Navbar ─────────────── */
/* Brand: the AG favicon mark + name + a soft "Blog" label. Search is a field with a "/" hint,
   icons are quiet, and "Portfolio" is the one filled button. Brand colours = the favicon's. */
:root {
  --nav-label: #1D4ED8;
  --nav-label-bg: rgba(37, 99, 235, 0.08);
  --nav-label-border: rgba(37, 99, 235, 0.22);
  --nav-cta: linear-gradient(135deg, #2563EB 0%, #0E7490 100%); /* white text 4.5:1+ at both ends */
  --nav-glow: rgba(37, 99, 235, 0.45);
}
body.quarto-dark {
  --nav-label: #7DD3FC;
  --nav-label-bg: rgba(34, 211, 238, 0.10);
  --nav-label-border: rgba(34, 211, 238, 0.28);
  --nav-glow: rgba(34, 211, 238, 0.30);
}

#quarto-header .navbar {
  min-height: var(--nav-height);
  padding-top: 0;
  padding-bottom: 0;
  background: var(--color-canvas-glass) !important;
  backdrop-filter: blur(14px) saturate(180%);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  border-bottom: 1px solid var(--color-hairline);
  box-shadow: none;
}
/* Brand-gradient hairline along the bottom edge */
#quarto-header .navbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(37, 99, 235, 0.55) 30%, rgba(34, 211, 238, 0.55) 70%, transparent 100%);
  pointer-events: none;
}

/* Brand */
#quarto-header .navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding-top: 0;
  padding-bottom: 0;
}
#quarto-header .navbar-brand::before {
  content: "";
  flex: none;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: url("https://gujurialekha.github.io/favicon.svg") center / cover no-repeat;
  box-shadow: 0 4px 14px -4px var(--nav-glow), 0 0 0 1px rgba(37, 99, 235, 0.18);
  transition: transform var(--dur-fast) var(--ease-out);
}
#quarto-header .navbar-brand:hover::before { transform: rotate(-6deg) scale(1.05); }
/* Wordmark: Space Grotesk Bold, the portfolio's display font (loaded in includes/seo_header.html) */
#quarto-header .navbar-title {
  font-family: "Space Grotesk", var(--font-sans);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-ink);
}
#quarto-header .navbar-brand::after {
  content: "Blog";
  padding: 2px 9px;
  font: 600 12px/1.45 var(--font-sans);
  letter-spacing: 0.02em;
  color: var(--nav-label);
  background: var(--nav-label-bg);
  border: 1px solid var(--nav-label-border);
  border-radius: 999px;
}

/* Section links */
#quarto-header .navbar .nav-link {
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-body);
  padding: 7px 12px;
  border-radius: 8px;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
#quarto-header .navbar .nav-link:hover {
  color: var(--color-ink);
  background: var(--color-surface-raised);
}
#quarto-header .navbar .nav-link.active,
#quarto-header .navbar .nav-link.active .menu-text {
  color: var(--color-ink);
}
#quarto-header .navbar .bi { font-size: 17px; }

/* Right-hand controls share one 36px box */
#quarto-header .navbar-nav.ms-auto .nav-link,
#quarto-header .quarto-color-scheme-toggle,
#quarto-header .aa-DetachedSearchButton {
  height: 36px;
  min-width: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 8px !important;
  border-radius: 8px !important;
}
#quarto-header .navbar-nav.ms-auto .nav-link,
#quarto-header .quarto-color-scheme-toggle { color: var(--color-muted); }
#quarto-header .navbar-nav.ms-auto .nav-link:hover,
#quarto-header .quarto-color-scheme-toggle:hover { color: var(--color-ink); background: var(--color-surface-raised); }

/* Dark-mode toggle: a bordered button like the search field, with a crisp moon (light mode) or sun
   (dark mode). The icon is an SVG mask filled with currentColor, so it follows the theme colours. */
#quarto-header .quarto-color-scheme-toggle {
  width: 36px;
  border: 1px solid var(--color-hairline);
  background: var(--color-surface);
  color: var(--color-body);
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
#quarto-header .quarto-color-scheme-toggle:hover {
  border-color: var(--color-hairline-strong);
  background: var(--color-surface);
  color: var(--nav-label);
}
#quarto-header .quarto-color-scheme-toggle .bi::before {
  content: "";
  display: block;
  width: 18px;
  height: 18px;
  background: currentColor !important;
  -webkit-mask: var(--nav-theme-icon) center / contain no-repeat;
  mask: var(--nav-theme-icon) center / contain no-repeat;
  transition: transform var(--dur-base) var(--ease-out);
}
#quarto-header .quarto-color-scheme-toggle:hover .bi::before { transform: rotate(-20deg); }
#quarto-header .quarto-color-scheme-toggle {
  --nav-theme-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='black' fill-opacity='.18' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z'/%3E%3C/svg%3E");
}
#quarto-header .quarto-color-scheme-toggle.alternate {
  --nav-theme-icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='12' cy='12' r='4' fill='black' fill-opacity='.18'/%3E%3Cpath d='M12 2v2M12 20v2M4.93 4.93l1.41 1.41M17.66 17.66l1.41 1.41M2 12h2M20 12h2M6.34 17.66l-1.41 1.41M19.07 4.93l-1.41 1.41'/%3E%3C/svg%3E");
}

/* "Portfolio": the one filled button; the arrow says it leaves the blog */
#quarto-header .navbar-nav.ms-auto .nav-item:last-child .nav-link {
  margin-left: 8px;
  padding: 0 14px !important;
  font-weight: 600;
  font-size: 14px;
  color: #fff !important;
  background: var(--nav-cta);
  border-radius: 10px !important;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 4px 12px -4px var(--nav-glow);
  transition: filter var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
#quarto-header .navbar-nav.ms-auto .nav-item:last-child .nav-link .menu-text { color: inherit; }
#quarto-header .navbar-nav.ms-auto .nav-item:last-child .nav-link::after {
  content: "\2197"; /* north-east arrow */
  margin-left: 6px;
  font-size: 13px;
  transition: transform var(--dur-fast) var(--ease-out);
}
#quarto-header .navbar-nav.ms-auto .nav-item:last-child .nav-link:hover {
  filter: brightness(1.08);
  background: var(--nav-cta);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 6px 16px -4px var(--nav-glow);
}
#quarto-header .navbar-nav.ms-auto .nav-item:last-child .nav-link:hover::after { transform: translate(2px, -2px); }

/* Search: an icon button on small screens */
.aa-DetachedSearchButton {
  border: 0 !important;
  background: transparent !important;
}
.aa-DetachedSearchButton:hover { background: var(--color-surface-raised) !important; }
.aa-DetachedSearchButtonIcon { color: var(--color-muted) !important; }
#quarto-header .aa-DetachedSearchButton { width: 36px; }
#quarto-header .aa-DetachedSearchButtonIcon svg { width: 16px; height: 16px; }

/* Phones and tablets: keep menu button, brand, theme and search on one row */
@media (max-width: 991.98px) {
  #quarto-header .navbar-toggler { padding: 4px 6px; flex: none; margin-right: 6px; border: 0; border-radius: 8px; }
  /* Focus ring for keyboard users only, not after a tap */
  #quarto-header .navbar-toggler:focus { box-shadow: none; }
  #quarto-header .navbar-toggler:focus-visible { outline: 2px solid #2563EB; outline-offset: 2px; }
  /* The brand takes the leftover width (basis 0), so only the menu wraps to its own row */
  #quarto-header .navbar-brand-container { flex: 1 1 0; min-width: 0; }
  /* Stacked lockup: mark on the left, name over a small "BLOG" line (no extra width needed) */
  #quarto-header .navbar-brand {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    column-gap: 9px;
    align-items: center;
    min-width: 0;
  }
  #quarto-header .navbar-brand::before { grid-row: 1 / span 2; width: 34px; height: 34px; border-radius: 9px; }
  #quarto-header .navbar-title {
    grid-column: 2;
    align-self: end;
    font-size: 18px;
    line-height: 1.1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  #quarto-header .navbar-brand::after {
    grid-column: 2;
    align-self: start;
    justify-self: start;
    padding: 0;
    font: 700 10px/1.4 var(--font-sans);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    background: none;
    border: 0;
  }
  #quarto-header #quarto-search.type-overlay .aa-Autocomplete { width: 36px; }
  #quarto-header #quarto-search,
  #quarto-header .quarto-navbar-tools { flex: none; margin: 0; }
  #quarto-header #quarto-search { margin-left: 6px; }
  /* Search matches the bordered theme button next to it */
  #quarto-header .aa-DetachedSearchButton {
    border: 1px solid var(--color-hairline) !important;
    background: var(--color-surface) !important;
  }
}
/* Narrowest phones (320px): slightly smaller wordmark so the full name fits */
@media (max-width: 359.98px) {
  #quarto-header .navbar-container { padding-left: 10px; padding-right: 10px; }
  #quarto-header .navbar-title { font-size: 15px; }
  #quarto-header .navbar-brand { column-gap: 7px; }
  #quarto-header .navbar-brand::before { width: 28px; height: 28px; border-radius: 8px; }
  #quarto-header .navbar-toggler { margin-right: 2px; }
  #quarto-header #quarto-search { margin-left: 4px; }
}

@media (min-width: 992px) {
  /* Desktop order: brand, menu ... search, theme, GitHub, LinkedIn, Portfolio. Quarto gives the brand
     order 2 and puts search and the theme toggle after the right-hand menu, so flatten the collapse
     wrapper and reorder with flex. */
  #quarto-header .navbar-collapse { display: contents !important; }
  #quarto-header .navbar-nav.me-auto { order: 3; margin: 0 auto 0 28px !important; gap: 2px; }
  #quarto-header #quarto-search { order: 4; margin: 0 6px 0 0; }
  #quarto-header .quarto-navbar-tools { order: 5; margin: 0 2px; }
  #quarto-header .navbar-nav.ms-auto { order: 6; margin-left: 0 !important; align-items: center; }

  /* Current section: a short brand-gradient bar on the navbar's bottom edge */
  #quarto-header .navbar-nav.me-auto .nav-link { position: relative; }
  #quarto-header .navbar-nav.me-auto .nav-link.active:not(.dropdown-toggle)::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: -13px;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, #2563EB, #22D3EE);
  }

  /* Search becomes a field with a "/" shortcut hint (Quarto pins its container to 40px) */
  #quarto-header #quarto-search.type-overlay .aa-Autocomplete { width: auto; }
  #quarto-header .aa-DetachedSearchButton {
    width: 210px;
    justify-content: flex-start;
    gap: 8px;
    padding: 0 8px 0 11px !important;
    border: 1px solid var(--color-hairline) !important;
    background: var(--color-surface) !important;
    border-radius: 10px !important;
    transition: border-color var(--dur-fast) var(--ease-out);
  }
  #quarto-header .aa-DetachedSearchButton:hover { border-color: var(--color-hairline-strong) !important; }
  #quarto-header .aa-DetachedSearchButtonPlaceholder {
    display: inline !important;
    font: 400 13.5px var(--font-sans);
    color: var(--color-muted);
  }
  #quarto-header .aa-DetachedSearchButtonPlaceholder:empty::before { content: "Search articles"; }
  #quarto-header .aa-DetachedSearchButton::after {
    content: "/";
    margin-left: auto;
    padding: 0 6px;
    font: 500 11px/18px var(--font-mono);
    color: var(--color-muted);
    background: var(--color-canvas);
    border: 1px solid var(--color-hairline-strong);
    border-radius: 5px;
  }
}

/* Tracks menu (generated by scripts/sync_tracks.py): header, one row per track with an icon tile
   and part count, a divider, then the roadmap link */
#quarto-header .dropdown-menu {
  border: 1px solid var(--color-hairline);
  border-radius: 14px;
  box-shadow: var(--shadow-overlay);
  background: var(--color-canvas);
  padding: 8px;
  min-width: 290px;
}
@media (min-width: 992px) {
  #quarto-header .dropdown-menu { margin-top: 12px !important; animation: nav-menu-in var(--dur-base) var(--ease-out); }
}
@keyframes nav-menu-in { from { opacity: 0; transform: translateY(-4px); } }
#quarto-header .dropdown-header {
  padding: 6px 10px 8px;
  font: 600 11px/1.4 var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
}
#quarto-header .dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-ink);
  border-radius: 10px;
  white-space: normal;
}
#quarto-header .dropdown-item .dropdown-text { display: flex; align-items: center; gap: 8px; flex: 1; }
#quarto-header .dropdown-item .bi {
  flex: none;
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  font-size: 16px;
  color: var(--nav-label);
  background: var(--nav-label-bg);
  border: 1px solid var(--nav-label-border);
  border-radius: 9px;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
#quarto-header .dropdown-item .menu-count {
  margin-left: auto;
  padding: 1px 8px;
  font: 500 11.5px/1.6 var(--font-mono);
  color: var(--color-muted);
  background: var(--color-surface-raised);
  border-radius: 999px;
}
#quarto-header .dropdown-item:hover,
#quarto-header .dropdown-item:focus {
  background: var(--color-surface-raised);
  color: var(--color-ink);
}
#quarto-header .dropdown-item:hover .bi,
#quarto-header .dropdown-item:focus .bi {
  color: #fff;
  background: var(--nav-cta);
  border-color: transparent;
}
#quarto-header .dropdown-divider { margin: 6px 4px; border-color: var(--color-hairline); opacity: 1; }
/* The roadmap link closes the menu: quieter text, same icon tile */
#quarto-header .dropdown-menu li:last-child .dropdown-item { font-size: 13.5px; color: var(--color-body); }

@media (prefers-reduced-motion: reduce) {
  #quarto-header .navbar-brand::before,
  #quarto-header .quarto-color-scheme-toggle .bi::before,
  #quarto-header .navbar-nav.ms-auto .nav-item:last-child .nav-link::after { transition: none; }
  #quarto-header .dropdown-menu { animation: none; }
}

/* Search overlay */
.aa-DetachedOverlay .aa-DetachedContainer,
.aa-Panel {
  border-radius: var(--radius-lg) !important;
  border: 1px solid var(--color-hairline) !important;
  box-shadow: var(--shadow-overlay) !important;
}


/* ─────────────── 5. Homepage ─────────────── */
.page-layout-custom #quarto-document-content { padding-top: 0; }

.home {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.home-hero {
  max-width: 760px;
  padding: 96px 0 64px;
}
.home-title {
  font-size: clamp(36px, 5vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
  margin: 16px 0 20px;
}
.home-dek {
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-body);
  max-width: 640px;
  margin: 0 0 32px;
}
.home-actions { display: flex; flex-wrap: wrap; gap: 12px; }

.home-section {
  padding: 64px 0;
  border-top: 1px solid var(--color-hairline);
}

.section-head { margin-bottom: 32px; max-width: 640px; }
.section-head-row {
  max-width: none;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}
.section-title {
  font-size: 28px;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 8px 0 8px;
  padding-bottom: 0;
  border-bottom: none;
}

/* Titles inside cards, rows and the roadmap: weight 600, no link underline */
.track-card-title, .post-row-title, main.content h3.roadmap-title, main.content h3 { font-weight: 600; }
.track-card a, .post-row a, .roadmap a, .btn-ui, .author-card a { text-decoration: none !important; }
.track-card-title a, .post-row-title a, .roadmap-title a,
.quarto-listing-default .listing-title, .quarto-listing-default .listing-title a { font-weight: 600; }
.section-desc { margin: 0; color: var(--color-body); }

/* Track cards */
.track-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 420px), 1fr));
  gap: 24px;
}
.track-grid .quarto-listing { margin: 0; }

.track-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
  height: 100%;
  padding: 24px;
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-spring);
}
.track-card:hover { box-shadow: var(--shadow-lifted); border-color: var(--color-hairline-strong); }
.track-card-title {
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin: 8px 0 6px;
}
.track-card-title a { color: var(--color-ink); }
.track-card-title a:hover { color: var(--color-primary); }
.track-card-desc { font-size: 14px; line-height: 1.5; margin: 0 0 10px; }

.track-card-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-hairline);
}
.track-card-steps li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-hairline);
  font-size: 14px;
  line-height: 1.45;
}
.track-card-steps a { color: var(--color-ink); font-weight: 500; }
.track-card-steps a:hover { color: var(--color-primary); }
.step-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
}
.track-card-more { margin-top: -8px; }
.track-card-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: auto; }

/* Post rows */
.post-rows { border-top: 1px solid var(--color-hairline); }
.post-row {
  position: relative;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-hairline);
}
.post-row-date {
  margin: 3px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}
.post-row-title {
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}
.post-row-title a { color: var(--color-ink); }
.post-row-title a::after { content: ""; position: absolute; inset: 0; } /* whole row is the link */
.post-row:hover .post-row-title a { color: var(--color-primary); }
.post-row-desc { font-size: 14px; line-height: 1.5; margin: 0 0 8px; }
.post-row-meta,
.roadmap-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}

/* Author card */
.author-card {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xl);
}
.author-avatar {
  flex: none;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-hairline);
  object-fit: cover;
}
.author-card-lg .author-avatar { width: 72px; height: 72px; }
.author-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  margin: 0 0 2px;
}
.author-bio { margin: 10px 0 12px; max-width: 640px; color: var(--color-body); }
.author-links { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 12px; margin-left: -12px; }
.author-card-lg { margin-bottom: 32px; }
.author-card-lg .author-links { margin-left: 0; gap: 8px; }


/* ─────────────── 6. Track roadmap page ─────────────── */
.track-facts {
  padding: 20px 24px;
  margin: 24px 0 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
}
.track-facts p { margin: 0 0 10px; }
.track-facts p:last-child { margin-bottom: 0; }

.roadmap {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}
.roadmap-step {
  position: relative;
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 20px;
  padding-bottom: 32px;
}
.roadmap-step::before { /* connector line between steps */
  content: "";
  position: absolute;
  left: 19px;
  top: 44px;
  bottom: 4px;
  width: 2px;
  background: var(--color-hairline);
}
.roadmap-step:last-child::before { display: none; }
.roadmap-step:last-child { padding-bottom: 0; }
.roadmap-marker {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  border: 1px solid var(--color-hairline);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
}
.roadmap-part {
  margin: 2px 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary);
}
main.content h3.roadmap-title {
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin: 0 0 8px;
}
.roadmap-title a { color: var(--color-ink); }
.roadmap-title a:hover { color: var(--color-primary); }
.roadmap-desc { margin: 0 0 10px; }
.roadmap-meta .tag-pill { text-transform: lowercase; letter-spacing: 0.02em; }


/* ─────────────── 7. Page title block (all non-home pages) ─────────────── */
#title-block-header { margin-bottom: 32px; padding-bottom: 24px; border-bottom: 1px solid var(--color-hairline); }

#title-block-header .article-eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.article-eyebrow a { color: var(--color-primary); }
.article-eyebrow a:hover { color: var(--color-primary-hover); }

#title-block-header h1.title {
  font-size: clamp(32px, 4vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 12px;
}

#title-block-header .description,
#title-block-header .description p {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.55;
  color: var(--color-body);
  margin-bottom: 0;
}

#title-block-header .quarto-categories { display: flex; flex-wrap: wrap; gap: 6px; margin: 4px 0 16px; }
#title-block-header .quarto-categories .quarto-category {
  margin: 0;
  font-size: 12px;
  text-transform: lowercase;
  letter-spacing: 0.02em;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  opacity: 1;
}

/* Author · Published as one mono row */
.quarto-title-meta {
  display: flex !important;
  flex-wrap: wrap;
  gap: 4px 20px;
  margin-top: 20px !important;
}
.quarto-title-meta-heading { display: none; }
#title-block-header .quarto-title-meta-contents,
#title-block-header .quarto-title-meta-contents p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}

/* Quarto's code-tools "Code" menu sits in the title row */
.quarto-title-tools-only, #quarto-code-tools-menu { font-size: 13px; }


/* ─────────────── 8. Article reading experience ─────────────── */
/* Serif prose for body text only; :where() keeps specificity low so component rules still win */
body.article main.content :where(p, li, dd, blockquote):not(:where(#title-block-header, .follow-card, .callout, #quarto-appendix, .cell-output) *) {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.7;
  letter-spacing: 0;
  text-wrap: pretty;
}
body.article main.content :where(li > p) { margin-bottom: 0.4em; }
body.article main.content :where(p):not(:where(#title-block-header, .follow-card) *) { margin-bottom: 1.1em; }

main.content h2 {
  font-size: 28px;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-top: 56px;
  margin-bottom: 16px;
  padding-bottom: 0;
  border-bottom: none;
}
main.content h3 {
  font-size: 21px;
  line-height: 1.35;
  letter-spacing: -0.015em;
  margin-top: 36px;
  margin-bottom: 12px;
}
main.content h4 {
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-top: 28px;
}
.header-section-number { color: var(--color-muted) !important; font-weight: 500; margin-right: 4px; }
main.content :is(h3, h4, h5, h6) { opacity: 1; } /* Quarto fades h3+ to 0.9, which drops muted text below AA */

/* Prose links: subtle underline */
main.content p a,
main.content li a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--color-primary) 30%, transparent);
}
main.content p a:hover,
main.content li a:hover { text-decoration-color: currentColor; }

blockquote {
  border-left: 3px solid var(--color-hairline-strong);
  padding: 4px 0 4px 20px;
  color: var(--color-body);
  margin: 24px 0;
}

hr { border-color: var(--color-hairline); opacity: 1; }

/* Inline code */
p code:not(.sourceCode), li code:not(.sourceCode), td code:not(.sourceCode) {
  font-family: var(--font-mono);
  font-size: 0.86em;
  padding: 1px 5px;
  border-radius: var(--radius-xs);
  background: var(--color-surface-raised);
  color: var(--color-ink);
}


/* ─────────────── 9. Code cells & output ─────────────── */
div.sourceCode {
  background: var(--color-surface) !important;
  border: 1px solid var(--color-hairline) !important;
  border-radius: var(--radius-md) !important;
  margin: 16px 0;
}
div.sourceCode pre.sourceCode { padding: 16px 20px; margin: 0; background: transparent; }
pre code, pre.sourceCode code {
  font-family: var(--font-mono);
  font-size: 14.5px;
  line-height: 1.6;
}

.code-copy-button {
  background: transparent !important;
  border-radius: var(--radius-sm) !important;
  color: var(--color-muted) !important;
}
.code-copy-button:hover { background: var(--color-surface-raised) !important; color: var(--color-ink) !important; }

/* "Show code" chip */
details.code-fold > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 8px 0 0;
  padding: 4px 12px;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
  background: var(--color-canvas);
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
details.code-fold > summary:hover { color: var(--color-ink); border-color: var(--color-hairline-strong); }
details.code-fold[open] > summary { margin-bottom: 0; }

/* Output: separated from code by a left rule, no fill */
.cell-output {
  border-left: 2px solid var(--color-hairline-strong);
  padding-left: 16px;
  margin: 12px 0 20px;
}
.cell-output pre,
.cell-output-stdout pre {
  background: transparent !important;
  border: none !important;
  padding: 4px 0 !important;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-body);
  white-space: pre-wrap;
}
.cell-output-display { overflow-x: auto; }

/* Syntax colours: github light tokens that fall below 4.5:1 on the code surface (#F8FAFC) */
/* (Quarto's highlight CSS hard-codes colours per class, so override the classes, not its variables) */
body.quarto-light code span:is(.at, .bu, .cf, .dt, .ex, .kw, .pp) { color: #CF222E; } /* was #D73A49, 4.37:1 → 5.12:1 */
body.quarto-light code span.va { color: #B34700; }                                    /* was #E36209, 3.34:1 */
body.quarto-light code span:is(.al, .er, .wa) { color: #C62828; }                     /* was #FF5555, 3.00:1 */


/* ─────────────── 10. Figures, tables, maths, callouts ─────────────── */
figure, .quarto-figure { margin: 24px 0; }
main.content img.figure-img,
.cell-output-display img {
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  background: #FFFFFF; /* charts keep a white plate in dark mode */
}
figcaption,
.figure-caption,
.quarto-float-caption {
  font-family: var(--font-sans) !important;
  font-size: 14px !important;
  line-height: 1.5;
  color: var(--color-body) !important;
  margin-top: 10px;
}

/* Data tables (incl. pandas DataFrames) */
main.content table {
  font-family: var(--font-sans);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  border-collapse: collapse;
  width: auto;
  max-width: 100%;
  margin: 16px 0 24px;
}
main.content table th,
main.content table td {
  padding: 8px 12px;
  border: none;
  border-bottom: 1px solid var(--color-hairline);
  font-family: var(--font-sans) !important;
  font-size: 14px !important;
  line-height: 1.45 !important;
  text-align: right;
}
main.content table thead th {
  background: var(--color-surface);
  color: var(--color-ink);
  font-weight: 500;
  border-bottom: 1px solid var(--color-hairline-strong);
}
main.content table th:first-child,
main.content table td:first-child { text-align: left; }
main.content table tbody th { color: var(--color-ink); font-weight: 500; }

.katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; margin: 24px 0; }
.katex { font-size: 1.05em; }

/* Callouts */
.callout {
  border: 1px solid var(--color-hairline) !important;
  border-left: 3px solid var(--callout-color, var(--color-primary)) !important;
  border-radius: var(--radius-md) !important;
  background: color-mix(in srgb, var(--callout-color, var(--color-primary)) var(--tint), var(--color-canvas)) !important;
  box-shadow: none !important;
  margin: 24px 0;
}
.callout-note { --callout-color: var(--color-primary); }
.callout-tip { --callout-color: var(--color-success); }
.callout-warning, .callout-caution { --callout-color: var(--color-warning); }
.callout-important { --callout-color: var(--color-danger); }
.callout .callout-header { background: transparent !important; border: none !important; }
.callout .callout-title-container { font-family: var(--font-sans); font-weight: 500; color: var(--color-ink); }
.callout .callout-icon::before { filter: none; }
body.article main.content .callout p,
body.article main.content .callout li { font-size: 17px; }

/* Margin footnotes / sidenotes */
.column-margin, .margin-aside, aside.footnotes, .footnote-back {
  font-size: 14px;
  color: var(--color-body);
}


/* ─────────────── 11. Sidebar (track) & table of contents ─────────────── */
#quarto-sidebar {
  border-right: 1px solid var(--color-hairline);
}
#quarto-sidebar .sidebar-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}
#quarto-sidebar .sidebar-link {
  font-size: 14px;
  line-height: 1.45;
  color: var(--color-body);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
#quarto-sidebar .sidebar-link:hover { background: var(--color-surface-raised); color: var(--color-ink); }
#quarto-sidebar .sidebar-link.active {
  background: var(--color-primary-subtle);
  color: var(--color-primary);
  font-weight: 500;
}
#quarto-sidebar .sidebar-item-section > .sidebar-item-container .sidebar-link { font-weight: 600; color: var(--color-ink); }
#quarto-sidebar .sidebar-item-section .sidebar-section { border-left: 1px solid var(--color-hairline); margin-left: 10px; padding-left: 4px; }

#toc-title {
  font-family: var(--font-mono);
  font-size: 12px !important;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 8px;
}
#TOC { border-left: 1px solid var(--color-hairline); padding-left: 0; }
#TOC .nav-link,
#TOC a {
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--color-muted);
  padding: 4px 0 4px 12px;
  margin-left: -1px;
  border-left: 2px solid transparent;
}
#TOC .nav-link:hover, #TOC a:hover { color: var(--color-ink); }
#TOC .nav-link.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  font-weight: 500;
}
#TOC ul ul .nav-link { padding-left: 24px; }


/* ─────────────── 12. End of article: follow card, citation, prev / next ─────────────── */
.follow-card {
  margin: 56px 0 8px;
  padding: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-xl);
}
body.article main.content .follow-card p { font-family: var(--font-sans); }
body.article main.content .follow-card-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: var(--color-ink);
  margin: 0 0 4px;
}
body.article main.content .follow-card-text { font-size: 14px; line-height: 1.5; margin: 0 0 16px; }
.follow-card-actions { display: flex; flex-wrap: wrap; gap: 8px; }

#quarto-appendix.default { border-top: 1px solid var(--color-hairline); margin-top: 48px; padding-top: 8px; }
#quarto-appendix .quarto-appendix-heading,
#quarto-appendix h2 {
  font-size: 21px;
  letter-spacing: -0.015em;
  border-bottom: none;
}
#quarto-appendix .quarto-appendix-contents div { opacity: 1 !important; } /* Quarto fades the cite-as wrapper to 0.9 */
#quarto-appendix .quarto-appendix-secondary-label {
  opacity: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}
#quarto-appendix .quarto-appendix-contents { font-size: 14px; }

.page-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
  padding-top: 0;
  border-top: none;
}
.page-navigation .nav-page { max-width: none; }
.page-navigation .nav-page-next { text-align: right; }
.page-navigation .nav-page a.pagination-link {
  display: block;
  height: 100%;
  padding: 16px 20px;
  background: var(--color-canvas);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  transition: box-shadow var(--dur-base) var(--ease-spring), border-color var(--dur-base) var(--ease-spring);
}
.page-navigation .nav-page a.pagination-link:hover { border-color: var(--color-hairline-strong); box-shadow: var(--shadow-lifted); }
.page-navigation .nav-page a.pagination-link::before {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.page-navigation .nav-page-previous a.pagination-link::before { content: "← Previous"; }
.page-navigation .nav-page-next a.pagination-link::before { content: "Next →"; }
.page-navigation .bi { display: none; }


/* ─────────────── 13. "All articles" listing ─────────────── */
.quarto-listing-default .quarto-post {
  padding: 20px 0;
  margin: 0;
  border-bottom: 1px solid var(--color-hairline);
  gap: 24px;
}
.quarto-listing-default .quarto-post .listing-title {
  font-size: 18px;
  line-height: 1.4;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}
.quarto-listing-default .quarto-post .listing-title a { color: var(--color-ink); }
.quarto-listing-default .quarto-post:hover .listing-title a { color: var(--color-primary); }
.quarto-listing-default .listing-description { font-size: 14px; line-height: 1.5; color: var(--color-body); }
.quarto-listing-default .listing-categories { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.quarto-listing-default .metadata,
.listing-date,
.listing-reading-time {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted) !important;
}

.quarto-listing-filter input,
.quarto-listing-filter .input-group-text,
#listing-listing .input-group input {
  border-color: var(--color-hairline-strong);
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.quarto-listing-category-title {
  opacity: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-muted);
}
.quarto-listing-category .category {
  font-size: 14px;
  color: var(--color-body);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.quarto-listing-category .category:hover { background: var(--color-surface-raised); color: var(--color-ink); }
.quarto-listing-category .category.active { background: var(--color-primary-subtle); color: var(--color-primary); font-weight: 500; }


/* ─────────────── 14. Footer ─────────────── */
.nav-footer {
  border-top: 1px solid var(--color-hairline);
  background: var(--color-canvas);
  padding: 32px 24px;
  font-size: 14px;
  color: var(--color-muted);
}
.nav-footer a, .nav-footer .nav-link { color: var(--color-muted); font-size: 14px; }
.nav-footer a:hover, .nav-footer .nav-link:hover { color: var(--color-ink); }


/* ─────────────── 15. Responsive ─────────────── */
/* Mobile secondary bar (sidebar toggle): small "you are here" label, keep the real H1 */
.quarto-secondary-nav .quarto-secondary-nav-title,
.quarto-secondary-nav h1 {
  font-size: 14px !important;
  font-weight: 500 !important;
  letter-spacing: -0.006em;
  color: var(--color-muted) !important;
  margin: 0;
}
@media (max-width: 991.98px) {
  #title-block-header h1.title { display: block !important; }
}

@media (max-width: 767.98px) {
  .home { padding: 0 16px; }
  .home-hero { padding: 56px 0 48px; }
  .home-section { padding: 48px 0; }
  .section-title { font-size: 24px; }
  .section-head-row { flex-direction: column; align-items: flex-start; }
  .post-row { grid-template-columns: 1fr; gap: 6px; }
  .page-navigation { grid-template-columns: 1fr; }
  .page-navigation .nav-page-next { text-align: left; }
  .author-card { flex-direction: column; }
}

@media (max-width: 575.98px) {
  body.article main.content p,
  body.article main.content li,
  body.article main.content blockquote { font-size: 17px; line-height: 1.65; }
  main.content h2 { font-size: 24px; margin-top: 44px; }
  #title-block-header h1.title { font-size: 28px; }
  .roadmap-step { grid-template-columns: 32px 1fr; gap: 14px; }
  .roadmap-marker { width: 32px; height: 32px; font-size: 12px; }
  .roadmap-step::before { left: 15px; top: 36px; }
  .track-card { padding: 20px; }
}

@media (pointer: coarse) {
  .btn-ui { min-height: 44px; }
}

/* Native smooth scrolling for anchor/TOC links (replaces Quarto's smooth-scroll script) */
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0ms !important;
    animation-duration: 0ms !important;
    scroll-behavior: auto !important;
  }
}