/* ================================================================
   martinschweinberger.de — styles.css
   Design direction: Modern · Technical · Professional · Authoritative
   Typography: Inter (headings/UI) + Source Sans 3 (body) + JetBrains Mono (code)
   Palette: Deep Navy · Sapphire · Gold · Cool Off-White
   ================================================================ */

/* ----------------------------------------------------------------
   FONTS
---------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Source+Sans+3:ital,wght@0,300;0,400;0,600;1,300;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

/* ----------------------------------------------------------------
   DESIGN TOKENS
---------------------------------------------------------------- */
:root {
  /* Backgrounds */
  --color-bg:            #F7F8FA;       /* cool off-white ground */
  --color-surface:       #FFFFFF;       /* card / panel backgrounds */
  --color-tint:          #E8F2FC;       /* blue-tinted highlight surface */

  /* Navy scale */
  --color-navy:          #0D1B2A;       /* deepest — hero, footer bg */
  --color-prussian:      #1A3A5C;       /* navbar, table headers */
  --color-slate-mid:     #2D5880;       /* secondary text, subheadings */
  --color-muted:         #4A6A8A;       /* muted text, captions */
  --color-stone-light:   #D0D8E4;       /* borders, dividers */

  /* Sapphire / action scale */
  --color-primary:       #2563A8;       /* links, buttons, active states */
  --color-primary-hover: #4A90D9;       /* hover */
  --color-primary-bg:    #E8F2FC;       /* tinted surface */

  /* Gold accent */
  --color-gold:          #C9A84C;       /* accent — highlights, TOC, tags */
  --color-gold-light:    #E8C96B;       /* lighter gold, hover */
  --color-gold-bg:       #F5E9C0;       /* very light gold tint */

  /* Typography */
  --font-display:  'Inter', system-ui, sans-serif;
  --font-body:     'Source Sans 3', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Courier New', monospace;

  --radius:        4px;
  --shadow-sm:     0 1px 4px rgba(13, 27, 42, 0.08);
  --shadow-md:     0 4px 16px rgba(13, 27, 42, 0.10);
  --transition:    0.18s ease;
}

/* ----------------------------------------------------------------
   BASE
---------------------------------------------------------------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-prussian);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ----------------------------------------------------------------
   TYPOGRAPHY
---------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-navy);
  line-height: 1.25;
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  letter-spacing: -0.015em;
}

h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-navy);
  padding-bottom: 0.5rem;
  margin-bottom: 1.4rem;
  border-bottom: 2px solid var(--color-gold);
  display: inline-block;
}

/* Override Quarto's full-width title block h1 */
#title-block-header h1.title {
  font-family: var(--font-display);
  font-size: 2.3rem;
  font-weight: 700;
  color: var(--color-navy);
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0.25rem;
  display: block;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-prussian);
  border-bottom: 1px solid var(--color-stone-light);
  padding-bottom: 0.3rem;
  margin-top: 2.6rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-navy);
  margin-top: 1.8rem;
}

h4 {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-top: 1.4rem;
}

p {
  color: var(--color-prussian);
  font-weight: 400;
  margin-bottom: 0.9rem;
}

li {
  font-weight: 400;
  color: var(--color-prussian);
  margin-bottom: 0.25rem;
}

strong {
  font-weight: 600;
  color: var(--color-navy);
}

em {
  font-style: italic;
  color: var(--color-slate-mid);
}

blockquote {
  border-left: 3px solid var(--color-gold);
  padding: 0.6rem 0 0.6rem 1.4rem;
  margin-left: 0;
  color: var(--color-slate-mid);
  font-style: italic;
  background: var(--color-gold-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--color-tint);
  color: var(--color-primary);
  padding: 0.15em 0.4em;
  border-radius: 2px;
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

/* ----------------------------------------------------------------
   LINKS
---------------------------------------------------------------- */
a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

a:visited {
  color: var(--color-primary);
}

a:hover {
  color: var(--color-primary-hover);
  border-bottom-color: var(--color-primary-hover);
  text-decoration: none;
}

/* ----------------------------------------------------------------
   NAVBAR  — two-row wrapping (Option A)
   Brand sits left; nav items wrap onto a second line when needed.
   Key mechanics:
     • flex-wrap: wrap  on the inner container lets items reflow
     • navbar height is auto (not fixed) so the second row shows
     • padding-top/bottom on links creates breathing room each row
---------------------------------------------------------------- */
.navbar {
  background-color: var(--color-prussian) !important;
  border-bottom: 2px solid var(--color-gold);
  padding: 0 1.5rem;
  font-family: var(--font-display);
  /* allow height to grow with two rows */
  height: auto !important;
  min-height: unset !important;
}

/* The Bootstrap container inside the navbar */
.navbar > .container,
.navbar > .container-fluid,
.navbar > .container-xxl {
  flex-wrap: wrap;
  align-items: center;
  padding-top: 0.3rem;
  padding-bottom: 0.3rem;
  row-gap: 0;
}

/* Brand — stays on its own leading slot */
.navbar-brand,
.navbar-brand:hover {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff !important;
  letter-spacing: -0.01em;
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
  margin-right: 1.25rem;
  flex-shrink: 0;
}

/* Toggler (mobile hamburger) */
.navbar-toggler {
  border-color: rgba(255,255,255,0.3);
  padding: 4px 8px;
  margin-left: auto;
}

.navbar-toggler-icon {
  filter: invert(1);
}

/* The collapsible nav container — allow wrapping */
.navbar-collapse {
  flex-basis: 100%;
  flex-grow: 1;
}

.navbar-nav {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;          /* KEY: lets tabs flow onto row 2 */
  align-items: center;
  gap: 0;
  padding: 0.15rem 0;
}

.navbar-nav .nav-link {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.80) !important;
  letter-spacing: 0.01em;
  padding: 0.38rem 0.65rem !important;
  border-radius: 3px;
  white-space: nowrap;
  transition: color var(--transition), background-color var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link:focus {
  color: #ffffff !important;
  background-color: rgba(201, 168, 76, 0.20);
  text-decoration: none;
}

.navbar-nav .nav-link.active {
  color: #ffffff !important;
  background-color: rgba(201, 168, 76, 0.28);
  border-bottom: 2px solid var(--color-gold);
}

/* Dropdown */
.navbar-nav .dropdown-menu {
  background-color: var(--color-prussian);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 6px 0;
  min-width: 200px;
}

.navbar-nav .dropdown-item {
  color: rgba(255,255,255,0.82);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 400;
  padding: 7px 16px;
  transition: background-color var(--transition), color var(--transition);
}

.navbar-nav .dropdown-item:hover {
  background-color: rgba(201, 168, 76, 0.20);
  color: #ffffff;
  text-decoration: none;
}

/* ----------------------------------------------------------------
   MAIN CONTENT AREA
---------------------------------------------------------------- */
main, .quarto-container {
  background-color: var(--color-bg);
}

.quarto-content {
  max-width: 780px;
}

#title-block-header {
  margin-bottom: 2.2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-stone-light);
}

#title-block-header .description {
  display: none;
}

/* ----------------------------------------------------------------
   TABLES
---------------------------------------------------------------- */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.91rem;
  margin: 1.5rem 0 2rem;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius);
  overflow: hidden;
}

thead tr {
  background-color: var(--color-prussian);
  color: #ffffff;
}

thead th {
  padding: 0.65rem 1rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: left;
  border: none;
}

tbody tr {
  border-bottom: 1px solid var(--color-stone-light);
  transition: background-color var(--transition);
}

tbody tr:hover {
  background-color: var(--color-tint);
}

tbody td {
  padding: 0.6rem 1rem;
  vertical-align: top;
  color: var(--color-prussian);
  font-weight: 400;
  border: none;
}

tbody tr:last-child {
  border-bottom: none;
}

/* ----------------------------------------------------------------
   TOC SIDEBAR
---------------------------------------------------------------- */
.sidebar nav[role=doc-toc] {
  font-family: var(--font-display);
  font-size: 0.82rem;
}

.sidebar nav[role=doc-toc] ul > li > a {
  color: var(--color-muted);
  transition: color var(--transition), border-color var(--transition);
  padding: 3px 6px;
}

.sidebar nav[role=doc-toc] ul > li > a:hover,
.sidebar nav[role=doc-toc] ul > li > ul > li > a:hover {
  color: var(--color-gold);
  border-left: 2px solid var(--color-gold);
  background-color: var(--color-gold-bg);
  text-decoration: none;
}

.sidebar nav[role=doc-toc] ul > li > a.active,
.sidebar nav[role=doc-toc] ul > li > ul > li > a.active {
  color: var(--color-gold) !important;
  border-left: 2px solid var(--color-gold);
  font-weight: 600;
  background-color: var(--color-gold-bg);
}

/* ----------------------------------------------------------------
   FOOTER
---------------------------------------------------------------- */
.nav-footer {
  background-color: var(--color-navy) !important;
  color: rgba(255, 255, 255, 0.48);
  font-family: var(--font-display);
  font-size: 0.80rem;
  font-weight: 400;
  padding: 22px 40px;
  border-top: 2px solid var(--color-gold);
}

.nav-footer a {
  color: rgba(255, 255, 255, 0.55) !important;
  text-decoration: none;
  transition: color var(--transition);
}

.nav-footer a:hover {
  color: var(--color-gold-light) !important;
  border-bottom: none;
}

.nav-footer .nav-footer-left,
.nav-footer .nav-footer-center,
.nav-footer .nav-footer-right {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

/* ----------------------------------------------------------------
   CALLOUTS
---------------------------------------------------------------- */
.callout {
  border-radius: var(--radius);
  border-left-width: 3px;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.callout-tip {
  border-left-color: var(--color-gold) !important;
  background-color: var(--color-gold-bg) !important;
}

.callout-tip .callout-header {
  background-color: rgba(201, 168, 76, 0.15) !important;
  color: var(--color-navy);
}

.callout-note {
  border-left-color: var(--color-primary) !important;
  background-color: var(--color-primary-bg) !important;
}

.callout-note .callout-header {
  background-color: rgba(37, 99, 168, 0.12) !important;
  color: var(--color-prussian);
}

/* ----------------------------------------------------------------
   LISTS
---------------------------------------------------------------- */
ol {
  padding-left: 1.4rem;
}

ol li {
  margin-bottom: 0.75rem;
  padding-left: 0.2rem;
}

/* Publications — hanging indent style */
.publications-list p {
  padding-left: 2rem;
  text-indent: -2rem;
}

/* ----------------------------------------------------------------
   HORIZONTAL RULE
---------------------------------------------------------------- */
hr {
  border: none;
  border-top: 1px solid var(--color-stone-light);
  margin: 2.5rem 0;
}

/* ----------------------------------------------------------------
   SEARCH
---------------------------------------------------------------- */
.quarto-search .aa-Form {
  border: 1px solid var(--color-stone-light);
  border-radius: var(--radius);
  background: var(--color-surface);
}

/* ----------------------------------------------------------------
   FIGURE CAPTIONS
---------------------------------------------------------------- */
.figure-caption,
figcaption {
  font-family: var(--font-display);
  font-size: 0.80rem;
  color: var(--color-muted);
  text-align: center;
  margin-top: 0.4rem;
}

/* ----------------------------------------------------------------
   RESPONSIVE
---------------------------------------------------------------- */
@media (max-width: 768px) {
  body {
    font-size: 15.5px;
  }

  h1 {
    font-size: 1.8rem;
  }

  #title-block-header h1.title {
    font-size: 1.9rem;
  }

  h2 {
    font-size: 1.2rem;
  }

  .navbar {
    padding: 0 1rem;
  }

  /* On mobile, collapse to vertical stack as normal */
  .navbar-nav {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: flex-start;
    padding: 0.25rem 0;
  }

  .navbar-nav .nav-link {
    padding: 0.45rem 0.5rem !important;
    width: 100%;
  }

  table {
    font-size: 0.84rem;
  }

  thead th,
  tbody td {
    padding: 0.45rem 0.7rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.55rem;
  }

  body {
    font-size: 15px;
    line-height: 1.70;
  }
}