/* ==========================================================================
   sporenweber.com — stylesheet
   A clean, content-first academic site.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  /* Color palette — botanical, scholarly */
  --color-bg:          #fafaf7;
  --color-surface:     #ffffff;
  --color-ink:         #1a1c1a;
  --color-ink-soft:    #4a5048;
  --color-muted:       #6b7268;
  --color-rule:        #e3e6df;
  --color-accent:      #2f5d3a;   /* deep forest green */
  --color-accent-soft: #5a8462;   /* sage */
  --color-highlight:   #c4d6b0;

  /* Typography */
  --font-sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --font-mono:  ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  /* Layout */
  --content-width: 760px;
  --content-width-wide: 960px;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --radius: 4px;
}

/* ---------- Reset / base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.65;
  color: var(--color-ink);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}

a:hover { color: var(--color-accent-soft); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-ink);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

h1 { font-size: 2.25rem; font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 var(--space-3); }

hr {
  border: 0;
  border-top: 1px solid var(--color-rule);
  margin: var(--space-5) 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: rgba(47, 93, 58, 0.08);
  padding: 1px 5px;
  border-radius: 3px;
}

/* ---------- Skip link (accessibility) ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: white;
  padding: 8px 16px;
  z-index: 100;
  text-decoration: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.skip-link:focus {
  left: 0;
  outline: 2px solid var(--color-ink);
  outline-offset: -2px;
}

/* ---------- Navigation ---------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-rule);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
  background: rgba(255, 255, 255, 0.92);
}

.nav-wrap {
  max-width: var(--content-width-wide);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.nav-brand {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-brand:hover { color: var(--color-accent); }

.nav-links {
  display: flex;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  text-decoration: none;
  padding: var(--space-1) 0;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--color-ink);
}

/* ---------- Main content layout ---------- */
main {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-7);
}

main.wide { max-width: var(--content-width-wide); }

/* ---------- Hero (home page) ---------- */
.hero {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: var(--space-6);
  align-items: center;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-rule);
}

.hero-text h1 {
  margin-top: 0;
  margin-bottom: var(--space-2);
  font-size: 2.5rem;
}

.hero-tagline {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-3);
  font-weight: 500;
}

.hero-affil {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}

.hero-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  background: var(--color-rule);
  box-shadow: 0 0 0 1px var(--color-rule);
}

.hero-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ---------- Site banner (header collage) ---------- */
.site-banner {
  margin: 0;
  width: 100%;
  overflow: hidden;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-rule);
  line-height: 0;
}

.site-banner img {
  width: 100%;
  height: clamp(120px, 17vw, 220px);
  object-fit: cover;
  object-position: center;
  display: block;
}

/* Slim variant for interior pages */
.site-banner.slim img { height: clamp(64px, 8vw, 96px); }

/* ---------- Future-work callouts ---------- */
.future-box {
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  border-left: 3px solid var(--color-accent-soft);
  border-radius: 0;
  padding: var(--space-4);
  margin: var(--space-4) 0 var(--space-5);
}

.future-label {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent-soft);
  margin: 0 0 var(--space-2);
}

.future-box p:last-child { margin-bottom: 0; font-size: 0.97rem; }
.future-box strong { color: var(--color-accent); }

/* ---------- CV download ---------- */
.cv-download {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin: var(--space-4) 0 var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-rule);
}

.button-link {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-surface);
  background: var(--color-accent);
  padding: 10px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--color-accent);
  transition: background 0.15s ease, transform 0.15s ease;
  display: inline-block;
}

.button-link:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent-soft);
  color: var(--color-surface);
  transform: translateY(-1px);
}

.cv-updated {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ---------- Utility ---------- */
.address {
  font-family: var(--font-sans);
  line-height: 1.5;
}

.note {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--color-muted);
  background: var(--color-surface);
  border: 1px dashed var(--color-rule);
  padding: var(--space-3);
  border-radius: var(--radius);
}

/* Pandoc wraps lone inline content in <p> — neutralize inside layout boxes. */
.hero-photo p,
.hero-photo span,
.cv-org p,
.pub-meta p,
.site-banner p,
.research-card h3 + p {
  margin: 0;
}

/* ---------- Social / contact links ---------- */
.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
  list-style: none;
  padding: 0;
}

.social-links li { margin: 0; }

.social-links a {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--color-ink-soft);
  padding: 6px 12px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  background: var(--color-surface);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.social-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-1px);
}

/* ---------- Section styling ---------- */
section { margin-bottom: var(--space-6); }

.section-label {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.lead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-ink-soft);
}

/* ---------- Research highlights grid ---------- */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin: var(--space-4) 0;
}

.research-card {
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.research-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(47, 93, 58, 0.08);
  border-color: var(--color-accent-soft);
}

.research-card h3 {
  margin-top: 0;
  font-size: 1.05rem;
  color: var(--color-accent);
}

.research-card p {
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ---------- Publication list ---------- */
.pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.pub-list li {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-rule);
}

.pub-list li:last-child { border-bottom: none; }

.pub-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--color-ink);
  margin-bottom: var(--space-1);
  line-height: 1.4;
}

.pub-title a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.pub-title a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.pub-authors {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-1);
}

.pub-authors .self { font-weight: 600; color: var(--color-ink); }

.pub-venue {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  color: var(--color-muted);
  font-style: italic;
}

.pub-meta {
  display: inline-flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
  flex-wrap: wrap;
}

.pub-tag {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 12px;
  background: var(--color-highlight);
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.pub-tag.doi { background: var(--color-rule); color: var(--color-ink-soft); }

/* ---------- CV / timeline styling ---------- */
.cv-entry {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-rule);
}

.cv-entry:last-child { border-bottom: none; }

.cv-date {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
}

.cv-body h3 {
  margin: 0 0 var(--space-1);
  font-size: 1.05rem;
}

.cv-body .cv-org {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-ink-soft);
  margin-bottom: var(--space-1);
}

.cv-body p { font-size: 0.95rem; margin-bottom: 0; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-rule);
  padding: var(--space-5) var(--space-4);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-muted);
  background: var(--color-surface);
}

.site-footer a { color: var(--color-ink-soft); }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 17px; }

  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.35rem; }

  .nav-toggle { display: block; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    gap: 0;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--color-rule);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
  }

  .nav-links.open { display: flex; }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--color-rule);
  }

  .nav-links li:last-child { border-bottom: none; }

  .nav-links a {
    display: block;
    padding: var(--space-3) var(--space-4);
    border-bottom: none;
  }

  main { padding: var(--space-5) var(--space-4) var(--space-6); }

  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-4);
  }

  .hero-photo {
    width: 140px;
    height: 140px;
    margin: 0 auto;
    order: -1;
  }

  .site-banner img { height: 110px; }

  .hero-text h1 { font-size: 1.85rem; }

  .social-links { justify-content: center; }

  .cv-entry {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .cv-date {
    font-weight: 600;
    color: var(--color-accent);
  }
}

/* ---------- Print styles ---------- */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle { display: none; }

  body { background: white; font-size: 11pt; }
  main { max-width: none; padding: 0; }
  a { color: var(--color-ink); text-decoration: none; }
  .pub-list li { page-break-inside: avoid; }
}

/* ---------- Focus styles (accessibility) ---------- */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.muted-note {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-muted);
}