/* ==========================================================================
   kayliehausknecht.github.io — Clean Academic Editorial Design System
   Warm, extremely light tannish-pink palette
   ========================================================================== */

:root {
  /* Color Palette — Extremely Light Blush / Tannish Pink */
  --bg-primary: #FBF0F2;
  --bg-elevated: #F4E2E6;
  --bg-surface: #FFFDFD;
  --bg-header: rgba(251, 240, 242, 0.90);

  --text-primary: #000000;
  --text-secondary: #000000;
  --text-muted: #000000;

  --accent: #8F3B45;
  --accent-hover: #6E2932;
  --accent-subtle: rgba(143, 59, 69, 0.08);
  --accent-border: rgba(143, 59, 69, 0.25);

  --teal-accent: #2E6460;
  --teal-subtle: rgba(46, 100, 96, 0.09);

  --border-subtle: #EAD6DA;
  --border-strong: #D9BEC3;

  --shadow-sm: 0 1px 2px rgba(36, 30, 28, 0.04);
  --shadow-md: 0 6px 20px -4px rgba(36, 30, 28, 0.06);
  --shadow-lg: 0 12px 32px -6px rgba(36, 30, 28, 0.09);

  /* Typography */
  --font-serif: 'Helvetica Neue', Helvetica, Arial, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Helvetica Neue', Helvetica, Arial, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Helvetica Neue', Helvetica, Arial, -apple-system, BlinkMacSystemFont, sans-serif;

  /* Layout */
  --max-width: 920px;
  --header-height: 68px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   Base & Reset
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.68;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Subtle paper texture overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.018;
  background-image: radial-gradient(var(--text-primary) 0.55px, transparent 0.55px);
  background-size: 12px 12px;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition), background-color var(--transition), border-color var(--transition);
}

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

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

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.22;
  letter-spacing: -0.015em;
}

h1 {
  font-size: clamp(2.15rem, 4vw, 2.85rem);
  font-weight: 500;
}

h2 {
  font-size: clamp(1.45rem, 2.5vw, 1.75rem);
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.2rem;
  font-weight: 500;
}

p {
  color: var(--text-secondary);
  margin-bottom: 1.1rem;
  font-size: 1.02rem;
}

p:last-child {
  margin-bottom: 0;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

/* ==========================================================================
   Layout Container & Header Navigation
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-brand {
  display: flex;
  align-items: center;
  color: var(--text-primary);
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.32rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.nav-wrapper {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.93rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  position: relative;
  transition: color var(--transition), background-color var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-elevated);
}

.nav-link.active {
  color: var(--accent);
  background-color: var(--accent-subtle);
  font-weight: 600;
}

/* ==========================================================================
   Main Content & Sections
   ========================================================================== */

main {
  flex: 1;
  padding: 3.25rem 0 4.5rem;
}

.section {
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
}

.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.35rem;
  display: block;
}

.section-link {
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.section-link:hover {
  text-decoration: underline;
}

/* ==========================================================================
   Home Page: Hero & Bio
   ========================================================================== */

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 265px;
  gap: 3rem;
  align-items: start;
}

.hero-subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.24rem;
  color: var(--text-secondary);
  margin: 0.45rem 0 1.35rem;
}

.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.65rem;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 0.86rem;
  font-weight: 500;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}

.social-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.social-btn svg {
  width: 15px;
  height: 15px;
  color: var(--text-muted);
  transition: color var(--transition);
}

.social-btn:hover svg {
  color: var(--accent);
}

.portrait-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.65rem;
  box-shadow: var(--shadow-md);
}

.portrait-img-wrap {
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
}

.portrait-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portrait-caption {
  margin-top: 0.6rem;
  padding: 0.2rem 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--text-muted);
  line-height: 1.45;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* News / Timeline list */
.news-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.news-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 1rem;
  align-items: baseline;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed var(--border-subtle);
}

.news-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.news-date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.news-text {
  font-size: 0.96rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Papers & Talks Page
   ========================================================================== */

.page-header {
  margin-bottom: 2.25rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.page-header p {
  max-width: 68ch;
  margin-top: 0.6rem;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  background: var(--bg-elevated);
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

.filter-tabs {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.filter-tab {
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  background: var(--bg-surface);
  color: var(--accent);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-sm);
  font-weight: 600;
}

.search-input-wrap {
  position: relative;
  flex: 1;
  max-width: 280px;
  min-width: 200px;
}

.search-input {
  width: 100%;
  padding: 0.42rem 0.75rem 0.42rem 2rem;
  font-family: var(--font-sans);
  font-size: 0.86rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition);
}

.search-input:focus {
  border-color: var(--accent);
}

.search-icon {
  position: absolute;
  left: 0.65rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  pointer-events: none;
}

.entry-group {
  margin-bottom: 2.75rem;
}

.entry-group-title {
  font-family: var(--font-serif);
  font-size: 1.45rem;
  margin-bottom: 1.15rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.entry-count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.pub-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.pub-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.pub-meta-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}

.pub-badge {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  background: var(--accent-subtle);
  color: var(--accent);
  font-weight: 500;
}

.pub-badge.talk {
  background: var(--teal-subtle);
  color: var(--teal-accent);
}

.pub-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.pub-title {
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.35;
}

.pub-authors {
  font-size: 0.93rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.pub-authors strong {
  color: var(--text-primary);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

.pub-venue {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 0.9rem;
}

.pub-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.action-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.28rem 0.65rem;
  border-radius: 5px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-primary);
  color: var(--text-secondary);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
}

.action-chip:hover,
.action-chip[aria-expanded="true"] {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.drawer-panel {
  display: none;
  margin-top: 0.95rem;
  padding: 0.95rem 1.1rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.drawer-panel.open {
  display: block;
}

.bibtex-pre {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.55;
  overflow-x: auto;
  white-space: pre;
  color: var(--text-primary);
  margin-bottom: 0.65rem;
}

.copy-btn {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  padding: 0.28rem 0.65rem;
  border-radius: 4px;
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition);
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ==========================================================================
   CV Page — Embedded PDF Viewer
   ========================================================================== */

.cv-header-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.cv-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: #FFFFFF;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #FFFFFF;
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.cv-pdf-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  height: 82vh;
  min-height: 680px;
}

.cv-pdf-frame {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 2rem 0;
  margin-top: auto;
  font-size: 0.86rem;
  color: var(--text-muted);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

/* ==========================================================================
   Responsive Styles
   ========================================================================== */

@media (max-width: 768px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .portrait-card {
    max-width: 240px;
    order: -1;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .search-input-wrap {
    max-width: 100%;
  }
}