/* ============================================
   DESIGN SYSTEM — Personal Theme Recreation
   for kristofmoeller.com
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --color-bg: #ffffff;
  --color-bg-alt: #fafafa;
  --color-text: #2d2d2d;
  --color-text-light: #6b7280;
  --color-text-lighter: #9ca3af;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-border: #e5e7eb;
  --color-card-overlay: rgba(26, 26, 46, 0.7);

  /* Typography */
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: var(--font-body);
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Sizing */
  --content-width: 720px;
  --wide-width: 1100px;
  --nav-height: 72px;

  /* Spacing scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 18px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent-hover); }

/* --- Page fade-in --- */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.page-content { animation: fadeIn 0.4s ease-out; }

/* --- Navigation --- */
.site-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg);
  height: var(--nav-height);
}

.site-nav__logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.site-nav__logo:hover { color: var(--color-accent); }

.site-nav__links { display: flex; gap: var(--space-lg); list-style: none; }

.site-nav__links a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  font-weight: 400;
  text-decoration: none;
  transition: color 0.2s;
}
.site-nav__links a:hover,
.site-nav__links a.active { color: var(--color-text); }

/* Mobile hamburger */
.site-nav__toggle { display: none; background: none; border: none; cursor: pointer; padding: var(--space-sm); }
.site-nav__toggle svg { width: 24px; height: 24px; stroke: var(--color-text); }

@media (max-width: 768px) {
  .site-nav__toggle { display: block; }
  .site-nav__links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0; right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
  }
  .site-nav__links.is-open { display: flex; }
}

/* --- Hero Section (Homepage) --- */
.hero {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg) var(--space-2xl);
}

.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text);
  max-width: 800px;
}

.hero__subtitle {
  margin-top: var(--space-md);
  font-size: 1.15rem;
  color: var(--color-text-light);
  max-width: 600px;
  line-height: 1.6;
}

/* --- Project Grid (Homepage) --- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
}

@media (max-width: 768px) {
  .project-grid { grid-template-columns: 1fr; }
}

.project-card {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  aspect-ratio: 16 / 10;
  background-color: var(--color-bg-alt);
  background-size: cover;
  background-position: center;
  cursor: pointer;
  text-decoration: none;
  display: block;
}

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: var(--color-card-overlay);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-xl);
  opacity: 0;
  transition: opacity 0.35s ease;
}

.project-card:hover .project-card__overlay { opacity: 1; }

.project-card__title {
  color: #fff;
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.project-card__subtitle {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.9rem;
  margin-top: var(--space-xs);
}

/* --- Page Header (for blog index, about, contact, etc.) --- */
.page-header {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg) var(--space-xl);
}

.page-header__title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.page-header__description {
  margin-top: var(--space-md);
  color: var(--color-text-light);
  font-size: 1.05rem;
}

/* --- Blog Post List --- */
.post-list {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
  list-style: none;
}

.post-list__item {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
}
.post-list__item:first-child { padding-top: 0; }
.post-list__item:last-child { border-bottom: none; }

.post-list__title {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.post-list__title a { color: var(--color-text); }
.post-list__title a:hover { color: var(--color-accent); }

.post-list__excerpt {
  margin-top: var(--space-sm);
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

.post-list__date {
  margin-top: var(--space-sm);
  color: var(--color-text-lighter);
  font-size: 0.85rem;
}

/* --- Pagination --- */
.pagination {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg) var(--space-3xl);
  display: flex;
  justify-content: space-between;
}

.pagination a {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.95rem;
}

/* --- Single Post / Project Layout --- */
.post-header {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg) var(--space-lg);
}

.post-header__title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.post-header__meta {
  margin-top: var(--space-md);
  color: var(--color-text-lighter);
  font-size: 0.9rem;
}

.post-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg) var(--space-3xl);
}

/* Post content typography */
.post-content h2 { font-size: 1.6rem; font-weight: 600; margin-top: var(--space-2xl); margin-bottom: var(--space-md); letter-spacing: -0.01em; }
.post-content h3 { font-size: 1.25rem; font-weight: 600; margin-top: var(--space-xl); margin-bottom: var(--space-md); }
.post-content p { margin-bottom: var(--space-md); }
.post-content ul, .post-content ol { margin-bottom: var(--space-md); padding-left: var(--space-lg); }
.post-content li { margin-bottom: var(--space-sm); }
.post-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-lg);
  margin: var(--space-xl) 0;
  color: var(--color-text-light);
  font-size: 1.1rem;
  font-style: italic;
}
.post-content img {
  margin: var(--space-xl) 0;
  border-radius: 6px;
}
.post-content pre {
  background: #1e1e2e;
  color: #cdd6f4;
  padding: var(--space-lg);
  border-radius: 8px;
  overflow-x: auto;
  margin: var(--space-xl) 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
}
.post-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}
.post-content pre code { background: none; padding: 0; font-size: inherit; }
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  font-size: 0.9rem;
}
.post-content th, .post-content td {
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) var(--space-md);
  text-align: left;
}
.post-content th { font-weight: 600; color: var(--color-text); }

/* --- Image Gallery (optional, for blog posts) --- */
.gallery {
  display: grid;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}
.gallery[data-columns="2"] { grid-template-columns: repeat(2, 1fr); }
.gallery[data-columns="3"] { grid-template-columns: repeat(3, 1fr); }
.gallery img { border-radius: 6px; width: 100%; }

@media (max-width: 640px) {
  .gallery[data-columns="2"],
  .gallery[data-columns="3"] { grid-template-columns: 1fr; }
}

/* --- About Page --- */
.about-content {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
}

.about-content img.portrait {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: var(--space-xl);
}

/* --- Contact Page --- */
.contact-section {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
}

.contact-section p {
  margin-bottom: var(--space-lg);
  color: var(--color-text-light);
  line-height: 1.7;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-text);
  font-weight: 500;
  transition: color 0.2s;
}
.contact-links a:hover { color: var(--color-accent); }

/* --- Publications Page --- */
.publications-list {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-3xl);
}

.publication-item {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
}
.publication-item:last-child { border-bottom: none; }

.publication-item__title {
  font-weight: 600;
  font-size: 1rem;
}

.publication-item__authors {
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-top: var(--space-xs);
}

.publication-item__journal {
  color: var(--color-text-lighter);
  font-size: 0.85rem;
  font-style: italic;
  margin-top: var(--space-xs);
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  color: var(--color-text-lighter);
  font-size: 0.85rem;
}

.site-footer__tagline {
  margin-bottom: var(--space-sm);
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.site-footer__social {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  list-style: none;
}

.site-footer__social a {
  color: var(--color-text-light);
  transition: color 0.2s;
}
.site-footer__social a:hover { color: var(--color-accent); }

/* --- Utility --- */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* --- Figure / Figcaption --- */
figure {
  margin: var(--space-xl) 0;
}
figure img {
  border-radius: 6px;
  width: 100%;
}
figcaption {
  font-size: 0.85rem;
  color: var(--color-text-lighter);
  margin-top: var(--space-sm);
  text-align: center;
}

/* ============================================
   LEGACY PAGE BRIDGE STYLES
   For pages converted from old dark-theme HTML
   ============================================ */

/* Container wrapper */
.container {
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* Section wrapper */
.cv-section {
  margin-bottom: var(--space-2xl);
}

/* Section headings */
.section-title {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

/* Card component */
.card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-xl);
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.card-description {
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.card-link {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.9rem;
  display: inline-block;
  margin-top: var(--space-sm);
}
.card-link:hover { color: var(--color-accent-hover); text-decoration: underline; }

/* Card/services grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

/* Timeline */
.timeline { list-style: none; margin-bottom: var(--space-lg); }

.timeline-item {
  border-left: 2px solid var(--color-border);
  padding: 0 0 var(--space-xl) var(--space-xl);
  position: relative;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-accent);
  position: absolute;
  left: -6px;
  top: 4px;
}

.timeline-date {
  font-size: 0.85rem;
  color: var(--color-text-lighter);
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.timeline-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
}

.timeline-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.timeline-body {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
}
.timeline-body p { margin-bottom: var(--space-sm); }
.timeline-body ul { padding-left: var(--space-lg); margin-top: var(--space-sm); }
.timeline-body li { margin-bottom: var(--space-xs); }

/* CV skills */
.cv-skills-group { margin-bottom: var(--space-lg); }
.cv-skills-group h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-lighter);
  margin-bottom: var(--space-sm);
}
.cv-list { display: flex; flex-direction: column; gap: var(--space-xs); }
.cv-list-item {
  font-size: 0.9rem;
  color: var(--color-text-light);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-border);
}

/* CV download row */
.cv-download-row { margin-top: var(--space-lg); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.6rem 1.2rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-hover); color: #fff; }

/* Filter buttons */
.filter-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.85rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text-light);
  transition: all 0.2s;
  margin-right: var(--space-sm);
  margin-bottom: var(--space-sm);
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* Talk cards */
.talk-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-xl);
  margin-bottom: var(--space-md);
}

.talk-type {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  margin-bottom: var(--space-sm);
}
.talk-type.oral  { background: #dbeafe; color: #1d4ed8; }
.talk-type.poster { background: #fce7f3; color: #9d174d; }

.talk-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  line-height: 1.5;
}
.talk-event {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 2px;
}
.talk-location {
  font-size: 0.875rem;
  color: var(--color-text-lighter);
}
.talk-download { margin-top: var(--space-sm); }

.download-link {
  color: var(--color-accent);
  font-size: 0.875rem;
  font-weight: 500;
}
.download-link:hover { color: var(--color-accent-hover); text-decoration: underline; }

/* Award callout */
.award-callout {
  background: #fffbeb;
  border: 1px solid #fcd34d;
  border-radius: 8px;
  padding: var(--space-lg) var(--space-xl);
  margin-bottom: var(--space-2xl);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.award-callout__icon { font-size: 1.5rem; flex-shrink: 0; color: #b45309; }
.award-callout__label {
  font-size: 0.75rem;
  font-weight: 700;
  color: #b45309;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}
.award-callout__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}
.award-callout__meta {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

/* Award badge (inline) */
.award-badge {
  display: inline-block;
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fcd34d;
  border-radius: 6px;
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: var(--space-sm);
}

/* Project status badge */
.project-status {
  display: inline-block;
  background: #dcfce7;
  color: #166534;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* News grid */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.news-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--space-xl);
}
.news-card h2 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  line-height: 1.4;
}
.news-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}

.news-card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}
.news-date {
  font-size: 0.8rem;
  color: var(--color-text-lighter);
  font-weight: 500;
}
.news-category {
  font-size: 0.75rem;
  color: var(--color-accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Footer pages nav */
.site-footer__pages {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
  list-style: none;
}
.site-footer__pages a {
  color: var(--color-text-lighter);
  font-size: 0.85rem;
  transition: color 0.2s;
}
.site-footer__pages a:hover { color: var(--color-accent); }

/* Mobile touch: always show project card overlays on touch devices */
@media (hover: none) {
  .project-card__overlay { opacity: 1; }
}

/* Imageless project card fallback */
.project-card:not([style*="background-image"]) .project-card__overlay {
  opacity: 1;
  background: var(--color-card-overlay, rgba(26, 26, 46, 0.85));
}

/* ============================================
   PUBLICATIONS PAGE ENHANCEMENTS
   ============================================ */

/* Role badges */
.publication-item__badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
  background: var(--color-bg-alt);
  color: var(--color-text-lighter);
  border: 1px solid var(--color-border);
}
.publication-item__badge--first {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* DOI link */
.publication-item__doi {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  margin-left: 0.25rem;
  transition: color 0.2s, border-color 0.2s;
}
.publication-item__doi:hover { border-color: var(--color-accent); }

/* Page header secondary links (Scholar, ORCID) */
.page-header__links {
  margin-top: 0.75rem;
  font-size: 0.9rem;
}
.page-header__links a { font-weight: 500; }

/* Abstract toggle */
.publication-item__abstract { margin-top: 0.5rem; }

.publication-item__abstract summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-light);
  transition: color 0.2s;
  list-style: none;
}
.publication-item__abstract summary::-webkit-details-marker { display: none; }
.publication-item__abstract summary::before { content: '▸ '; }
.publication-item__abstract[open] summary::before { content: '▾ '; }
.publication-item__abstract summary:hover { color: var(--color-accent); }

.publication-item__abstract p {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.7;
  border-left: 2px solid var(--color-border);
  padding-left: 0.875rem;
}

/* ============================================
   TESTIMONIALS (Services page)
   ============================================ */

.testimonials-grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: var(--content-width);
}

.testimonial {
  border-left: 3px solid var(--color-accent);
  padding: 1.25rem 1.5rem;
  margin: 0;
  background: var(--color-bg-alt);
  border-radius: 0 8px 8px 0;
}

.testimonial__text {
  font-size: 1rem;
  font-style: italic;
  line-height: 1.7;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}

.testimonial__source {
  font-size: 0.85rem;
  color: var(--color-text-light);
  font-style: normal;
}
.testimonial__source strong { color: var(--color-text); }