/* ==========================================================================
   ARTHROSE-RATGEBER.INFO - DESIGN SYSTEM & STYLESHEET
   Concept: "The Arthrose Guide" - Modern Medical Encyclopedia / Editorial Atlas
   Colors: Warm Paper (#f9f8f5), Anthracite (#1b242b), Pale Gray (#f0ede6),
           Muted Blue (#3b6978), Dark Petrol (#163d47), Terracotta Accent (#c85a32)
   ========================================================================== */

:root {
  --font-serif: 'Playfair Display', 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, Monaco, monospace;

  /* Color Palette */
  --bg-page: #fbfaf7;
  --bg-surface: #ffffff;
  --bg-muted: #f2eee8;
  --bg-accent-subtle: #f8efe8;
  
  --color-anthracite: #192229;
  --color-anthracite-soft: #2d3840;
  --color-text-secondary: #56646f;
  --color-border: #ded7ce;
  --color-border-subtle: #eae5de;

  --color-petrol: #163d47;
  --color-blue: #325866;
  --color-terracotta: #c85a32;
  --color-terracotta-hover: #b04b27;
  --color-terracotta-subtle: #faf1ed;

  /* Spacing */
  --container-max: 1220px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.22s ease-in-out;
}

/* CSS Reset & Defaults */
*, *::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-page);
  color: var(--color-anthracite);
  line-height: 1.68;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

a {
  color: var(--color-petrol);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: var(--transition);
}

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

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* Typography Editorial */
h1, h2, h3, h4, .editorial-heading {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-anthracite);
  letter-spacing: -0.015em;
  word-break: break-word;
}

h1 { font-size: clamp(2.2rem, 4vw + 1rem, 3.4rem); margin-bottom: 1.25rem; }
h2 { font-size: clamp(1.7rem, 2.5vw + 0.8rem, 2.3rem); margin-top: 2rem; margin-bottom: 1rem; }
h3 { font-size: clamp(1.25rem, 1.5vw + 0.5rem, 1.55rem); margin-top: 1.5rem; margin-bottom: 0.75rem; }

.chapter-badge {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-terracotta);
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}

.chapter-badge::before {
  content: "";
  display: inline-block;
  width: 16px;
  height: 2px;
  background-color: var(--color-terracotta);
}

.lead-text {
  font-size: 1.18rem;
  line-height: 1.7;
  color: var(--color-anthracite-soft);
  margin-bottom: 1.5rem;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.section-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin: 3.5rem 0;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(251, 250, 247, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-top {
  background: var(--color-petrol);
  color: #d1e2e6;
  font-size: 0.78rem;
  padding: 0.35rem 0;
  text-align: center;
  letter-spacing: 0.04em;
}

.header-top a {
  color: #fff;
  font-weight: 600;
  margin-left: 0.4rem;
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem 0;
  gap: 1.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--color-anthracite);
}

.brand-logo svg {
  width: 36px;
  height: 36px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-anthracite);
  line-height: 1.1;
}

.brand-subtitle {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-terracotta);
  font-weight: 600;
  margin-top: 2px;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
}

.nav-desktop a {
  color: var(--color-anthracite-soft);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding: 0.4rem 0;
}

.nav-desktop a:hover,
.nav-desktop a.active {
  color: var(--color-terracotta);
}

.nav-desktop a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-terracotta);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-primary {
  background-color: var(--color-terracotta);
  color: #fff !important;
}

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

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

.btn-outline:hover {
  background-color: var(--bg-muted);
  border-color: var(--color-terracotta);
  color: var(--color-terracotta);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
}

.mobile-menu-btn {
  display: none;
  padding: 0.5rem;
  color: var(--color-anthracite);
}

/* Mobile Navigation Drawer */
.mobile-nav-drawer {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(25, 34, 41, 0.6);
  z-index: 2000;
  backdrop-filter: blur(4px);
}

.mobile-nav-content {
  width: 85%;
  max-width: 340px;
  height: 100%;
  background: var(--bg-page);
  padding: 2rem 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: 4px 0 20px rgba(0,0,0,0.15);
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav-links a {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-anthracite);
  text-decoration: none;
}

/* Sub-Hero Chapter Bar */
.chapter-bar-wrapper {
  background: var(--bg-muted);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
  white-space: nowrap;
  -webkit-overflow-scrolling: touch;
}

.chapter-bar {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  padding: 0.65rem 1.5rem;
  max-width: var(--container-max);
  margin: 0 auto;
}

.chapter-bar a {
  font-size: 0.84rem;
  color: var(--color-anthracite-soft);
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.chapter-bar a span {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-terracotta);
  font-size: 0.8rem;
}

.chapter-bar a:hover {
  color: var(--color-terracotta);
}

/* Global Search Component */
.search-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(25, 34, 41, 0.7);
  backdrop-filter: blur(6px);
  z-index: 3000;
  justify-content: center;
  align-items: flex-start;
  padding-top: 10vh;
}

.search-modal.active {
  display: flex;
}

.search-container {
  background: var(--bg-surface);
  width: 90%;
  max-width: 680px;
  border-radius: var(--radius-md);
  box-shadow: 0 15px 40px rgba(0,0,0,0.25);
  border: 1px solid var(--color-border);
  overflow: hidden;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

.search-header {
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  gap: 1rem;
}

.search-input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 1.2rem;
  font-family: inherit;
  color: var(--color-anthracite);
  background: transparent;
}

.search-suggestions {
  padding: 0.85rem 1.5rem;
  background: var(--bg-muted);
  font-size: 0.82rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
}

.search-tag {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 0.2rem 0.65rem;
  font-size: 0.78rem;
  color: var(--color-anthracite-soft);
  cursor: pointer;
  text-decoration: none;
}

.search-tag:hover {
  background: var(--color-terracotta);
  color: #fff;
  border-color: var(--color-terracotta);
}

.search-results {
  padding: 1rem 1.5rem;
  overflow-y: auto;
  max-height: 55vh;
}

.search-result-item {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--color-border-subtle);
  display: block;
  text-decoration: none;
}

.search-result-item:hover .result-title {
  color: var(--color-terracotta);
}

.result-category {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  color: var(--color-terracotta);
  text-transform: uppercase;
  font-weight: 600;
}

.result-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--color-anthracite);
  margin: 0.2rem 0;
}

.result-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* Editorial Boxes & Cards */
.editorial-card {
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  padding: 2rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.editorial-card:hover {
  border-color: var(--color-anthracite-soft);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.editorial-card .card-number {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-border);
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
}

.info-box {
  background: var(--bg-accent-subtle);
  border-left: 4px solid var(--color-terracotta);
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.info-box.blue {
  background: #eaf1f4;
  border-left-color: var(--color-petrol);
}

.info-box h4 {
  margin-top: 0;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* SVG Anatomical Joint Diagram Interactive */
.joint-diagram-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  padding: 2.5rem;
  border-radius: var(--radius-md);
  align-items: center;
}

.joint-svg-wrapper {
  background: var(--bg-page);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
}

.joint-part {
  cursor: pointer;
  transition: all 0.2s ease;
}

.joint-part:hover, .joint-part.active {
  filter: drop-shadow(0 0 6px rgba(200, 90, 50, 0.6));
  stroke: var(--color-terracotta) !important;
}

.joint-legend-item {
  padding: 0.75rem 1rem;
  border-left: 3px solid var(--color-border);
  margin-bottom: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
  background: var(--bg-page);
}

.joint-legend-item:hover, .joint-legend-item.active {
  border-left-color: var(--color-terracotta);
  background: var(--color-terracotta-subtle);
}

/* Timeline: Wie entsteht Arthrose */
.timeline-container {
  position: relative;
  margin: 3rem 0;
  padding-left: 2rem;
  border-left: 2px solid var(--color-border);
}

.timeline-step {
  position: relative;
  margin-bottom: 2.5rem;
}

.timeline-step:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -2.6rem;
  top: 0.2rem;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 3px solid var(--color-terracotta);
}

.timeline-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-terracotta);
  font-weight: 700;
  margin-bottom: 0.25rem;
}

/* Symptom-Checker / Beschwerden-Finder */
.symptom-tool {
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  padding: 2.5rem;
  border-radius: var(--radius-md);
  margin: 2.5rem 0;
}

.tool-step-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.88rem;
  margin-bottom: 0.4rem;
  color: var(--color-anthracite);
}

.form-select, .form-input, .form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  background: var(--bg-page);
  font-family: inherit;
  font-size: 0.95rem;
  border-radius: var(--radius-sm);
  color: var(--color-anthracite);
  outline: none;
  transition: var(--transition);
}

.form-select:focus, .form-input:focus, .form-textarea:focus {
  border-color: var(--color-terracotta);
  background: #fff;
}

.tool-output {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--bg-page);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: none;
}

.tool-output.visible {
  display: block;
}

/* Mythos vs Fakt Interactive */
.myth-card {
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  margin-bottom: 1.25rem;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.myth-header {
  padding: 1.25rem 1.5rem;
  background: var(--bg-surface);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
}

.myth-header:hover {
  background: var(--bg-muted);
}

.myth-body {
  padding: 1.5rem;
  border-top: 1px solid var(--color-border-subtle);
  background: var(--bg-page);
  display: none;
}

.myth-body.open {
  display: block;
}

.myth-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  text-transform: uppercase;
  font-weight: 700;
}

.myth-tag.myth {
  background: #fde8e8;
  color: #c53030;
}

.myth-tag.fact {
  background: #e6f4ea;
  color: #137333;
}

/* 30-Day Movement Plan Interactive Calendar */
.day-plan-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.85rem;
  margin: 2rem 0;
}

.day-plan-card {
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  padding: 1rem;
  text-align: center;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.day-plan-card:hover, .day-plan-card.active {
  border-color: var(--color-terracotta);
  background: var(--color-terracotta-subtle);
}

.day-plan-number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--color-terracotta);
}

.day-plan-title {
  font-size: 0.82rem;
  font-weight: 600;
  margin-top: 0.35rem;
  color: var(--color-anthracite);
}

.day-plan-detail-box {
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  padding: 2rem;
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

/* Exercise Cards & Detail Pages */
.exercise-meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 1rem 0;
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.exercise-meta-item strong {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  font-family: var(--font-mono);
}

.step-list {
  padding-left: 1.25rem;
  margin: 1.25rem 0;
}

.step-list li {
  margin-bottom: 0.75rem;
}

/* Article Layout */
.article-header {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2.5rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  font-family: var(--font-mono);
}

.article-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 3.5rem;
  align-items: start;
}

.article-sidebar {
  position: sticky;
  top: 90px;
  background: var(--bg-surface);
  border: 1px solid var(--color-border);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
}

.article-toc {
  list-style: none;
}

.article-toc li {
  margin-bottom: 0.65rem;
  font-size: 0.88rem;
}

.article-toc a {
  text-decoration: none;
  color: var(--color-anthracite-soft);
}

.article-toc a:hover {
  color: var(--color-terracotta);
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: 780px;
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-image {
  margin: 2rem 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.article-image figcaption {
  padding: 0.6rem 1rem;
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  background: var(--bg-muted);
}

/* Medical Reference Box */
.reference-box {
  background: var(--bg-muted);
  border: 1px solid var(--color-border);
  padding: 2rem;
  border-radius: var(--radius-sm);
  margin-top: 3.5rem;
}

.reference-box h3 {
  margin-top: 0;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.reference-list {
  list-style: none;
  margin-top: 1rem;
  font-size: 0.85rem;
}

.reference-list li {
  margin-bottom: 0.65rem;
  padding-left: 1.2rem;
  position: relative;
}

.reference-list li::before {
  content: '▪';
  position: absolute;
  left: 0;
  color: var(--color-terracotta);
}

/* FAQ Accordion */
.faq-item {
  border-bottom: 1px solid var(--color-border);
  padding: 1.25rem 0;
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-anthracite);
}

.faq-question:hover {
  color: var(--color-terracotta);
}

.faq-icon {
  font-size: 1.4rem;
  transition: transform 0.2s ease;
  color: var(--color-terracotta);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding-top: 1rem;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--color-anthracite-soft);
}

.faq-item.active .faq-answer {
  display: block;
}

/* Footer Editorial */
.site-footer {
  background: var(--color-anthracite);
  color: #c7d2d9;
  padding: 5rem 0 2rem;
  margin-top: auto;
  border-top: 4px solid var(--color-terracotta);
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-brand .brand-title {
  color: #fff;
}

.footer-claim {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: #e5ecef;
  margin: 1.2rem 0;
  line-height: 1.4;
}

.footer-col h4 {
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1.25rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.65rem;
}

.footer-col a {
  color: #a4b5bf;
  text-decoration: none;
  font-size: 0.88rem;
}

.footer-col a:hover {
  color: #fff;
  text-decoration: underline;
}

.medical-disclaimer-box {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  line-height: 1.6;
  color: #9cb1bc;
  margin-bottom: 3rem;
}

.medical-disclaimer-box strong {
  color: #e2ebef;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: #7b8e99;
}

.footer-bottom a {
  color: #9cb1bc;
}

/* Responsive & Mobile First */
@media (max-width: 1024px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
  .article-sidebar {
    position: static;
    margin-bottom: 2rem;
  }
}

@media (max-width: 768px) {
  .nav-desktop {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .joint-diagram-container {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* Reduced Motion Accessibility */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}