/* =========================================
   SPECTRE Website – Base Styles
   ========================================= */

/* --- Font: Inter (SIL Open Font License, assets/fonts/OFL.txt), one variable file for all weights 300-800,
   preloaded in the <head>. font-display: block - the text waits the few milliseconds for Inter instead of
   showing a stand-in font first and then jumping. --- */
@font-face {
  font-family: 'Inter';
  src: url('../fonts/inter-var-latin.woff2') format('woff2');
  font-weight: 300 800;
  font-style: normal;
  font-display: block;
}

/* --- CSS Variables / Design Tokens --- */
:root {
  /* Primary Colors */
  --color-primary: #7C3AED;
  --color-primary-hover: #6D28D9;
  --color-primary-light: #A78BFA;

  /* Dark Theme (Hero-Bereiche) */
  --color-dark-deep: #0a0f2e;        /* Hero + Intro (sehr dunkel) */
  --color-dark-bg: #1e2856;          /* News / Publications (Indigo) */
  --color-dark-darker: #131838;      /* Open Positions (zwischen deep und indigo) */
  --color-dark-surface: #2a3370;
  --color-dark-gradient-start: #0a0f2e;
  --color-dark-gradient-end: #1e2856;

  /* Light Theme (Content-Bereiche) */
  --color-light-bg: #FFFFFF;
  --color-light-surface: #F8FAFC;
  --color-light-border: #E2E8F0;

  /* Text */
  --color-text-primary: #1E293B;
  --color-text-secondary: #64748B;
  --color-text-on-dark: #FFFFFF;
  --color-text-on-dark-muted: #94A3B8;

  /* Accent Colors */
  --color-accent-green: #10B981;
  --color-accent-yellow: #F59E0B;
  --color-accent-teal: #14B8A6;
  --color-accent-orange: #F97316;

  /* Typography */
  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --section-padding: clamp(3rem, 6vw, 6rem);
  --container-max: 1000px;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-card: 12px;
}

/* --- Accessibility --- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: 0.75rem 1.5rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 1rem;
}

/* Focus styles for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

a:focus:not(:focus-visible),
button:focus:not(:focus-visible) {
  outline: none;
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 90;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-light-border);
  background: var(--color-light-bg);
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: opacity 0.3s, transform 0.3s;
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--color-text-primary);
  background-color: var(--color-light-bg);
  line-height: 1.6;
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  line-height: 1.2;
  font-weight: 700;
}

ul, ol {
  list-style: none;
}

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

.container--narrow {
  max-width: 800px;
}

/* --- Sections --- */
.section {
  padding: var(--section-padding) 0;
}

.section__title {
  font-size: var(--fs-h2);
  margin-bottom: 1rem;
}

.section__text {
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto 2rem;
}

/* --- Dark Background Sections --- */
.dark-bg {
  background: var(--color-dark-bg);
  color: var(--color-text-on-dark);
}

.dark-bg .section__title {
  color: var(--color-text-on-dark);
}

.dark-bg .section__text {
  color: var(--color-text-on-dark-muted);
}

/* =========================================
   Header / Navigation
   ========================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-dark-bg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.site-logo {
  display: flex;
  align-items: center;
  color: var(--color-text-on-dark);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.05em;
}

.site-logo img {
  height: 36px;
  width: auto;
}

.site-logo__text {
  font-weight: 800;
  letter-spacing: 0.1em;
}

.site-nav__list {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.site-nav__link {
  color: var(--color-text-on-dark-muted);
  font-size: var(--fs-body);
  font-weight: 500;
  padding: 0.5rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--color-text-on-dark);
  border-bottom-color: var(--color-primary);
}

/* Mobile Toggle */
.site-header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.site-header__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-on-dark);
  transition: transform 0.3s;
}

/* =========================================
   Hero
   ========================================= */
.hero {
  position: relative;
  background: var(--color-dark-deep);
  color: var(--color-text-on-dark);
  padding: clamp(4rem, 10vw, 8rem) 0;
  overflow: hidden;
}

.hero__video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero__gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 50%, rgba(124, 58, 237, 0.15) 0%, transparent 60%);
  pointer-events: none;
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
}

.hero__title {
  font-size: var(--fs-display);
  font-weight: 800;
  margin-bottom: 1rem;
  max-width: 540px;
  line-height: 1.15;
}

.hero__subtitle {
  font-size: var(--fs-body);
  color: var(--color-text-on-dark-muted);
  max-width: 380px;
  margin-bottom: 1.75rem;
  line-height: 1.55;
}

.hero--home {
  padding: clamp(6rem, 14vw, 12rem) 0;
  text-align: left;
  background-size: cover;
  background-position: center right;
}

/* Profile Hero */
.hero--profile .hero__content--profile {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.profile-hero__portrait img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-primary-light);
}

/* =========================================
   Buttons
   ========================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: var(--fs-body);
  cursor: pointer;
  border: 2px solid transparent;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #fff;
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn--small {
  padding: 0.4rem 1rem;
  font-size: var(--fs-body);
}

/* =========================================
   Cards (shared base)
   ========================================= */
.research-card,
.team-card,
.course-card,
.lab-card,
.printable-card,
.guide-card,
.position-card {
  background: var(--color-light-bg);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.research-card:hover,
.team-card:hover,
.course-card:hover,
.lab-card:hover,
.guide-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

/* --- Research Card --- */
.research-topics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.research-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.75rem 1.25rem;
  color: var(--color-text-primary);
  background: transparent;
  border: none;
  border-left: 1.5px solid var(--color-light-border);
  border-right: 1.5px solid var(--color-light-border);
  border-radius: 24px;
  box-shadow: none;
}

.research-card:hover {
  background: var(--color-light-surface);
  transform: none;
  box-shadow: none;
}

.research-card__icon {
  width: 56px;
  height: 56px;
  margin-bottom: 1rem;
}

.research-card__title {
  font-size: var(--fs-body);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

/* Title colors per area */
.research-card--green .research-card__title { color: var(--color-accent-green); }
.research-card--yellow .research-card__title { color: var(--color-accent-yellow); }
.research-card--teal .research-card__title { color: var(--color-accent-orange); }
.research-card--orange .research-card__title { color: var(--color-primary); }

.research-card__tagline {
  font-size: var(--fs-body);
  font-style: italic;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- News Accordion --- */
.news-accordion {
  display: flex;
  flex-direction: column;
}

.news-item {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--color-light-border);
}

.news-item:first-child {
  border-top: 1px solid var(--color-light-border);
}

.news-item__header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.news-item__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.news-item__date {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.news-item__author {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
}

.news-item__title {
  font-size: var(--fs-h3);
  font-weight: 700;
  margin: 0.25rem 0 0.5rem;
  line-height: 1.3;
}

.news-item__title a {
  color: inherit;
  text-decoration: none;
}

.news-item__title a:hover {
  color: var(--color-primary);
}

.news-item__excerpt {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
  max-width: 800px;
}

.news-item__toggle {
  display: inline-block;
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.news-item__toggle:hover {
  color: var(--color-primary-hover);
}

/* --- News Item Expanded --- */
.news-item--expanded {
  padding-bottom: 3rem;
}

.news-item__body {
  margin-top: 1.5rem;
}

.news-item__content {
  font-size: var(--fs-body);
  line-height: 1.8;
  max-width: 800px;
}

.news-item__content h2 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.news-item__content p {
  margin-bottom: 1.25rem;
}

.news-item__content img {
  border-radius: var(--radius-md);
  margin: 1.5rem 0;
}

.news-item__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-light-border);
}

.news-item__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--color-light-surface);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-sm);
  font-size: var(--fs-body);
  font-weight: 500;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.news-item__link:hover {
  border-color: var(--color-primary);
  background: var(--color-light-bg);
  color: var(--color-primary);
}

.news-item__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.news-item__tag {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  background: var(--color-light-surface);
  border: 1px solid var(--color-light-border);
  border-radius: 999px;
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--color-text-secondary);
}

/* --- Team Card --- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
}

.team-grid--small {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.team-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--color-text-primary);
}

.team-card__portrait img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
}

.team-card__placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--color-light-surface);
  margin-bottom: 1rem;
}

.team-card__name {
  font-size: var(--fs-body);
  margin-bottom: 0.25rem;
}

.team-card__role {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
}

/* --- Course Card --- */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.course-card {
  padding: 1.5rem;
}

.course-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
}

.course-card__title {
  font-size: var(--fs-body);
}

.course-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.course-card__badge {
  font-size: var(--fs-small);
  background: var(--color-light-surface);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  font-weight: 600;
}

.course-card__description {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.course-card__link {
  font-weight: 600;
  font-size: var(--fs-body);
}

/* --- Lab Card --- */
.labs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.lab-card__image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.lab-card__content {
  padding: 1.5rem;
}

.lab-card__title {
  font-size: var(--fs-body);
  margin-bottom: 0.75rem;
}

.lab-card__link {
  font-weight: 600;
  font-size: var(--fs-body);
}

/* --- Position Card --- */
.positions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.position-card {
  padding: 2rem;
  text-align: center;
  background: var(--color-dark-surface);
  border-color: rgba(255, 255, 255, 0.1);
}

.position-card__icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  display: block;
}

.position-card__title {
  color: var(--color-text-on-dark);
  margin-bottom: 1rem;
}

/* =========================================
   Tags
   ========================================= */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  background: var(--color-light-surface);
  color: var(--color-text-secondary);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  font-size: var(--fs-small);
  font-weight: 500;
}

.tag--small {
  padding: 0.15rem 0.6rem;
  font-size: var(--fs-small);
}

/* =========================================
   Social Links
   ========================================= */
.social-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-on-dark);
  font-size: var(--fs-small);
  font-weight: 700;
  transition: background 0.2s;
}

.social-link:hover {
  background: var(--color-primary);
  color: #fff;
}

/* =========================================
   Carousel (shared)
   ========================================= */
[data-carousel] {
  position: relative;
}

[data-carousel] {
  position: relative;
  overflow: visible;
}

[data-carousel] .carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-light-border);
  background: var(--color-light-bg);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  z-index: 2;
}

.carousel-btn:hover {
  background: var(--color-light-surface);
}

.carousel-btn--prev {
  left: -60px;
}

.carousel-btn--next {
  right: -60px;
}

.labs-carousel__track,
.publications-carousel__track {
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.labs-carousel__track::-webkit-scrollbar,
.publications-carousel__track::-webkit-scrollbar {
  display: none;
}

.labs-carousel__track > *,
.publications-carousel__track > * {
  flex: 0 0 calc(25% - 1.125rem);
  scroll-snap-align: start;
  min-width: 250px;
}

/* Publication Slide */
.publication-slide {
  background: var(--color-light-bg);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  color: #0f172a;
}

.dark-bg .publication-slide,
.dark-bg .publication-slide h3,
.dark-bg .publication-slide__title {
  color: #0f172a;
}

.publication-slide__cover {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.publication-slide__info {
  padding: 1rem;
}

.publication-slide__journal {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  margin: 0.25rem 0 0.75rem;
}

/* =========================================
   Timeline
   ========================================= */
.timeline {
  display: flex;
  gap: 2rem;
  overflow-x: auto;
  padding: 2rem 0;
  scroll-snap-type: x mandatory;
}

.timeline__item {
  flex: 0 0 280px;
  scroll-snap-align: start;
  position: relative;
  padding-top: 2rem;
  border-top: 2px dashed var(--color-text-on-dark-muted);
}

.timeline__year {
  position: absolute;
  top: -0.75rem;
  left: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.15rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: var(--fs-body);
  font-weight: 700;
}

.timeline__title {
  font-size: var(--fs-body);
  margin-bottom: 0.5rem;
  color: var(--color-text-on-dark);
}

.timeline__item p {
  font-size: var(--fs-body);
  color: var(--color-text-on-dark-muted);
}

/* =========================================
   Publications Table
   ========================================= */
.pub-table-wrapper {
  overflow-x: auto;
}

.pub-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-body);
}

.pub-table th,
.pub-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-light-border);
}

.pub-table th {
  font-weight: 600;
  color: var(--color-text-secondary);
  font-size: var(--fs-small);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pub-table tr:hover {
  background: var(--color-light-surface);
}

/* =========================================
   FAQ Accordion
   ========================================= */
.faq-accordion {
  max-width: 700px;
}

.faq-item {
  border-bottom: 1px solid var(--color-light-border);
}

.faq-item__question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 1.25rem 0;
  background: none;
  border: none;
  cursor: pointer;
  font-size: var(--fs-body);
  font-weight: 600;
  color: var(--color-text-primary);
  text-align: left;
}

.faq-item__icon {
  font-size: 1.25rem;
  transition: transform 0.3s;
}

.faq-item__question[aria-expanded="true"] .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  padding-bottom: 1.25rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* =========================================
   Semester Guide
   ========================================= */
.semester-guide__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.semester-box {
  background: var(--color-light-surface);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
}

.semester-box h3 {
  font-size: var(--fs-body);
  margin-bottom: 1rem;
  color: var(--color-primary);
}

.semester-box ul {
  list-style: disc;
  padding-left: 1.25rem;
}

.semester-box li {
  margin-bottom: 0.5rem;
  font-size: var(--fs-body);
}

/* =========================================
   Impact Stories
   ========================================= */
.impact-stories__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.impact-card {
  background: var(--color-light-surface);
  border: 1px solid var(--color-light-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
}

.impact-card h3 {
  font-size: var(--fs-body);
  margin-bottom: 1rem;
}

.impact-card ul {
  list-style: disc;
  padding-left: 1.25rem;
}

.impact-card li {
  margin-bottom: 0.5rem;
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
}

/* =========================================
   Profile Content
   ========================================= */
.profile-content {
  max-width: 800px;
}

.profile-section {
  margin-bottom: 3rem;
}

.profile-section h2 {
  font-size: var(--fs-h3);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-light-border);
}

.profile-section ul {
  list-style: disc;
  padding-left: 1.5rem;
}

.profile-section li {
  margin-bottom: 0.5rem;
}

.publication-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-light-border);
}

.publication-item strong {
  display: block;
  margin-bottom: 0.25rem;
}

.pub-meta {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
}

.pub-doi {
  font-size: var(--fs-small);
  font-weight: 600;
  margin-left: 0.5rem;
}

/* =========================================
   Article
   ========================================= */
/* Legacy article styles removed -- now using .news-item BEM classes */

/* =========================================
   Course Meta
   ========================================= */
.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.course-meta__item {
  background: var(--color-light-surface);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  font-size: var(--fs-body);
  font-weight: 500;
}

/* =========================================
   Pagination
   ========================================= */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 3rem;
}

.pagination__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-light-border);
  font-weight: 600;
  font-size: var(--fs-body);
  color: var(--color-text-primary);
  transition: background 0.2s, border-color 0.2s;
}

.pagination__link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination__link.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* =========================================
   Footer
   ========================================= */
.site-footer {
  background: var(--color-dark-bg);
  color: var(--color-text-on-dark-muted);
  padding: 3rem 0 1.5rem;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}

.site-footer__col {
  font-size: var(--fs-small);
  line-height: 1.7;
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.social-icons {
  display: flex;
  gap: 0.75rem;
}

.social-icon__circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: var(--color-text-on-dark-muted);
  font-size: 0.75rem;
  font-weight: 700;
  transition: border-color 0.2s, color 0.2s;
}

.social-icon:hover .social-icon__circle {
  border-color: var(--color-primary);
  color: var(--color-text-on-dark);
}

.site-footer__copy {
  font-size: var(--fs-small);
}

/* =========================================
   Intro Text
   ========================================= */
.intro-text {
  font-size: var(--fs-body);
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.65;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* =========================================
   Teaching Teaser
   ========================================= */
.teaching-teaser {
  background-size: cover;
  background-position: center;
  border-radius: var(--radius-lg);
  padding: 3rem;
  position: relative;
}

.teaching-teaser::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.7);
  border-radius: inherit;
}

.teaching-teaser__content {
  position: relative;
  color: var(--color-text-on-dark);
}

.teaching-teaser__content h2 {
  margin-bottom: 1rem;
}

.teaching-teaser__content p {
  color: var(--color-text-on-dark-muted);
  margin-bottom: 1.5rem;
  max-width: 500px;
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 768px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-dark-bg);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 1rem;
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    padding: 0.75rem 0;
  }

  .site-header__toggle {
    display: flex;
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .site-footer__bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .hero--profile .hero__content--profile {
    flex-direction: column-reverse;
    text-align: center;
  }

  .timeline {
    flex-direction: column;
  }

  .timeline__item {
    flex: none;
    border-top: none;
    border-left: 2px dashed var(--color-text-on-dark-muted);
    padding-top: 0;
    padding-left: 2rem;
  }

  .timeline__year {
    position: static;
    display: inline-block;
    margin-bottom: 0.5rem;
  }

  .labs-carousel__track > *,
  .publications-carousel__track > * {
    flex: 0 0 calc(100% - 1rem);
  }

  .news-item {
    padding: 1.5rem 0;
  }

  .news-item__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .news-item__title {
    font-size: var(--fs-h3);
  }
}