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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Assistant", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: #334155;
  background: #ffffff;
  -webkit-font-smoothing: antialiased;
}

/* ============================================
   LAYOUT
   ============================================ */
.blog-layout {
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 24px;
  gap: 60px;
}

/* ============================================
   SIDEBAR NAVIGATION
   ============================================ */
.blog-sidebar {
  position: sticky;
  top: 40px;
  width: 280px;
  min-width: 280px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding-right: 20px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.blog-sidebar::-webkit-scrollbar {
  display: none;
}

/* Close button — hidden on desktop */
.sidebar-close {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-family: "Assistant", sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: #64748b;
  padding: 8px 12px;
  border-radius: 8px;
  transition: all 0.2s ease;
  margin-bottom: 16px;
}

.sidebar-close:hover {
  color: #bf3425;
  background: #fef7f6;
}

.sidebar-close svg {
  flex-shrink: 0;
}

.blog-sidebar-title {
  font-family: "Archivo", sans-serif;
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #9d9d9c;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-left: 12px;
}

.blog-sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.blog-sidebar-link {
  font-family: "Assistant", sans-serif;
  font-weight: 600;
  font-size: 14px;
  color: #64748b;
  padding: 10px 12px;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s ease;
  display: block;
}

.blog-sidebar-link:hover {
  color: #47577c;
  background-color: #f8fafc;
}

.blog-sidebar-link.active {
  color: #bf3425;
  background-color: #fef7f6;
  font-weight: 700;
}

/* ============================================
   MOBILE NAV TOGGLE
   ============================================ */
.mobile-nav-toggle {
  display: none;
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1001;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, #bf3425 0%, #9d2a1e 100%);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(191, 52, 37, 0.4);
  transition: all 0.3s ease;
  align-items: center;
  justify-content: center;
}

.mobile-nav-toggle:hover {
  transform: scale(1.1);
}

.mobile-nav-toggle svg {
  width: 24px;
  height: 24px;
  stroke: #ffffff;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.blog-content {
  flex: 1;
  max-width: 900px;
  min-width: 0;
}

/* ============================================
   BLOG META
   ============================================ */
.blog-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  color: #64748b;
  margin-bottom: 10px;
}

.blog-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.blog-meta-icon {
  width: 16px;
  height: 16px;
  color: #64748b;
  flex-shrink: 0;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
.blog-content h1 {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 2.75rem;
  line-height: 1.15;
  color: #1e293b;
  margin-bottom: 1.5rem;
}

.blog-content h2 {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 1.75rem;
  color: #1e293b;
  margin-top: 3.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #bf3425;
}

.blog-content h3 {
  font-family: "Archivo", sans-serif;
  font-weight: 600;
  font-size: 1.25rem;
  color: #47577c;
  margin-top: 2rem;
  margin-bottom: 0.875rem;
}

.blog-content h4 {
  font-family: "Archivo", sans-serif;
  font-weight: 600;
  font-size: 1.1rem;
  color: #1e293b;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

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

.blog-content li {
  margin-bottom: 0.625rem;
  font-size: 1.0625rem;
}

.blog-content a {
  color: #47577c;
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 600;
  transition: color 0.2s;
}

.blog-content a:hover {
  color: #bf3425;
}

/* Drop Cap */
.drop-cap::first-letter {
  float: left;
  font-family: "Archivo", sans-serif;
  font-size: 4.5rem;
  font-weight: 700;
  line-height: 0.8;
  color: #bf3425;
  margin-right: 12px;
  margin-top: 8px;
}

/* ============================================
   IMAGES
   ============================================ */
.full-width-image {
  width: 100%;
  border-radius: 12px;
  margin: 2rem 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  display: block;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.full-width-image:hover {
  transform: scale(1.01);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.image-caption {
  font-size: 0.875rem;
  color: #64748b;
  text-align: center;
  margin-top: -1.25rem;
  margin-bottom: 2rem;
  font-style: italic;
}

/* ============================================
   SPLIT LAYOUT
   ============================================ */
.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
  margin: 2.5rem 0;
}

.split-layout.reverse {
  direction: rtl;
}

.split-layout.reverse > * {
  direction: ltr;
}

.split-image img {
  width: 100%;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  display: block;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.split-image img:hover {
  transform: scale(1.01);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.split-image .image-caption {
  margin-top: 0.5rem;
  margin-bottom: 0;
}

.split-text h3 {
  margin-top: 0;
}

/* ============================================
   HIGHLIGHT BOXES
   ============================================ */
.highlight-box {
  background: linear-gradient(135deg, #fef7f6 0%, #fff8f7 100%);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  margin: 2rem 0;
  border: 1px solid #fbd5d0;
}

.highlight-box p {
  margin-bottom: 0;
}

.highlight-box h4 {
  color: #bf3425;
  margin-top: 0;
}

.highlight-box.dark {
  background: linear-gradient(135deg, #1e293b 0%, #2d3a52 100%);
  border-color: #334155;
  color: #e2e8f0;
}

.highlight-box.dark h4 {
  color: #f87171;
}

.highlight-box.dark p {
  color: #cbd5e1;
  margin-bottom: 0;
}

/* ============================================
   INFOGRAPHIC PLACEHOLDERS
   ============================================ */
.infographic-placeholder {
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border: 2px dashed #cbd5e1;
  border-radius: 12px;
  padding: 2.5rem 2rem;
  margin: 2.5rem 0;
  text-align: center;
  color: #64748b;
}

.infographic-label {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 0.875rem;
  color: #47577c;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.infographic-description {
  font-size: 0.9375rem;
  color: #64748b;
  line-height: 1.6;
  text-align: left;
}

/* ============================================
   LEARN MORE CARDS
   ============================================ */
.learn-more-container {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}

.learn-more-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.learn-more-card:hover {
  border-color: #bf3425;
  box-shadow: 0 8px 25px -5px rgba(191, 52, 37, 0.15);
  transform: translateY(-2px);
}

.learn-more-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #47577c 0%, #1e293b 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background 0.3s;
  color: #ffffff;
}

.learn-more-card:hover .learn-more-icon {
  background: linear-gradient(135deg, #bf3425 0%, #9d2a1e 100%);
}

.learn-more-icon svg {
  width: 24px;
  height: 24px;
  color: #ffffff;
}

.learn-more-text {
  display: flex;
  flex-direction: column;
}

.learn-more-title {
  font-family: "Archivo", sans-serif;
  font-weight: 600;
  font-size: 1rem;
  color: #1e293b;
  transition: color 0.3s;
}

.learn-more-card:hover .learn-more-title {
  color: #bf3425;
}

.learn-more-desc {
  font-size: 0.875rem;
  color: #64748b;
  margin-top: 0.25rem;
}

/* ============================================
   CTA SECTION
   ============================================ */
.cta-section {
  background: linear-gradient(135deg, #fef7f6 0%, #ffffff 100%);
  border: 2px solid #bf3425;
  border-radius: 16px;
  padding: 2rem;
  margin: 2.5rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, #bf3425, #47577c);
}

.cta-section p {
  margin-bottom: 1.25rem;
  color: #1e293b;
  font-size: 1.125rem;
}

.cta-button {
  display: inline-block;
  padding: 0.875rem 2rem;
  background: linear-gradient(135deg, #bf3425 0%, #9d2a1e 100%);
  color: #ffffff !important;
  font-family: "Archivo", sans-serif;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px -5px rgba(191, 52, 37, 0.4);
  color: #ffffff !important;
}

/* ============================================
   REFERENCES LIST
   ============================================ */
.references-list {
  padding-left: 1.5rem;
}

.references-list li {
  font-size: 0.9375rem;
  color: #475569;
  margin-bottom: 1rem;
  line-height: 1.65;
}

.references-list a {
  font-weight: 400;
  word-break: break-all;
}

/* ============================================
   AUTHOR SECTION
   ============================================ */
.author-section {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid #e2e8f0;
}

.author-card {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
  border-radius: 20px;
  padding: 2rem;
  border: 1px solid #e2e8f0;
}

.author-image-wrapper {
  flex-shrink: 0;
}

.author-image {
  width: 180px;
  height: 180px;
  border-radius: 16px;
  object-fit: cover;
  display: block;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15);
}

.author-info {
  flex: 1;
  min-width: 0;
}

.author-name {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  color: #1e293b;
  margin-bottom: 4px;
  text-decoration: underline;
  text-decoration-color: #bf3425;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.author-title {
  font-size: 1rem;
  font-weight: 600;
  color: #47577c;
  margin-bottom: 16px;
}

.author-social {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.author-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: #f8fafc;
  border-radius: 10px;
  transition:
    transform 0.2s,
    background 0.2s;
  text-decoration: none;
}

.author-social a:hover {
  transform: scale(1.1);
  background: #e2e8f0;
}

.author-social svg {
  width: 24px;
  height: 24px;
}

.about-author-label {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 0.875rem;
  color: #bf3425;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.author-bio {
  font-size: 0.9375rem;
  color: #475569;
  line-height: 1.7;
  text-align: justify;
  margin: 0;
}

/* ============================================
   SECTION SCROLL MARGIN
   ============================================ */
section {
  scroll-margin-top: 40px;
}

/* ============================================
   RESPONSIVE — 1024px
   ============================================ */
@media (max-width: 1024px) {
  .blog-layout {
    flex-direction: column;
    gap: 32px;
  }

  /* Sidebar becomes horizontal pills on tablet */
  .blog-sidebar {
    position: relative;
    top: 0;
    width: 100%;
    min-width: 100%;
    max-height: none;
    padding-right: 0;
    padding-bottom: 24px;
    border-bottom: 1px solid #e2e8f0;
    align-self: auto;
  }

  .blog-sidebar-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .blog-sidebar-link {
    font-size: 13px;
    padding: 8px 12px;
  }

  .blog-content h1 {
    font-size: 2rem;
  }

  .split-layout {
    grid-template-columns: 1fr;
  }

  .split-layout.reverse {
    direction: ltr;
  }

  .split-layout.reverse > * {
    direction: ltr;
  }

  .learn-more-container {
    grid-template-columns: 1fr;
  }

  .author-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

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

  .author-bio {
    text-align: center;
  }
}

/* ============================================
   RESPONSIVE — 768px (Mobile, sidebar overlay)
   ============================================ */
@media (max-width: 768px) {
  /* Show hamburger button */
  .mobile-nav-toggle {
    display: flex;
  }

  /* Sidebar becomes full-screen overlay */
  .blog-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    background: #ffffff;
    z-index: 999;
    padding: 20px;
    overflow-y: auto;
    transform: translateY(-100%);
    transition: transform 0.3s ease;
    border-bottom: none;
    max-height: 100vh;
    align-self: auto;
  }

  .blog-sidebar.active {
    transform: translateY(0);
  }

  /* Show close button inside sidebar */
  .sidebar-close {
    display: flex;
  }

  .blog-sidebar-nav {
    flex-direction: column;
    gap: 4px;
  }

  .blog-sidebar-link {
    font-size: 16px;
    padding: 14px 16px;
    border-radius: 8px;
  }

  .blog-sidebar-title {
    font-size: 12px;
    margin-bottom: 20px;
    padding-top: 8px;
  }

  .blog-layout {
    padding: 20px 16px;
    gap: 0;
  }

  .blog-content h1 {
    font-size: 1.75rem;
  }

  .blog-content h2 {
    font-size: 1.4rem;
    margin-top: 2.5rem;
  }

  .split-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .split-layout.reverse {
    direction: ltr;
  }

  .split-layout.reverse > * {
    direction: ltr;
  }

  .learn-more-container {
    grid-template-columns: 1fr;
  }

  .author-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 1.5rem;
  }

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

  .author-bio {
    text-align: left;
  }

  .highlight-box {
    padding: 1.25rem 1.5rem;
  }

  .infographic-placeholder {
    padding: 1.5rem 1rem;
  }
}

/* ============================================
   RESPONSIVE — 640px
   ============================================ */
@media (max-width: 640px) {
  .blog-content h1 {
    font-size: 1.5rem;
  }

  .blog-content h2 {
    font-size: 1.25rem;
  }

  .blog-meta {
    gap: 10px;
    font-size: 13px;
  }

  .cta-section {
    padding: 1.5rem 1rem;
  }

  .cta-button {
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
  }

  .author-image {
    width: 140px;
    height: 140px;
  }
}

/* ============================================
   RESPONSIVE — 480px
   ============================================ */
@media (max-width: 480px) {
  .blog-content h1 {
    font-size: 1.35rem;
  }

  .blog-layout {
    padding: 16px 12px;
  }
}


/* ============================================================
   LIGHTNING / PAINTED CFRP BLOG — bespoke styles
   perspective callout + reading-flow reveal + 5 INTERACTIVE
   infographics (lstk lcfg lcsn larea ldep)
   ============================================================ */

/* ----- Our-perspective / editorial callout (citation discipline) ----- */
.perspective-box {
  position: relative;
  background: #f6f8fc;
  border: 1px solid #dfe4ee;
  border-left: 4px solid #47577c;
  border-radius: 12px;
  padding: 22px 26px 20px;
  margin: 2rem 0;
}
.perspective-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #47577c;
  margin-bottom: 8px;
}
.perspective-box p {
  margin: 0;
  color: #334155;
  font-style: italic;
  line-height: 1.7;
}
.perspective-box-lead {
  background: #fdf2f1;
  border-color: #f2c4bd;
  border-left-color: #bf3425;
}

/* ----- Reading-flow reveal (progressive; JS adds the classes) ----- */
.reveal-init {
  opacity: 0;
  transform: translateY(18px);
  will-change: opacity, transform;
}
.reveal-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Shared infographic card shell */
.lstk-root,
.lcfg-root,
.lcsn-root,
.larea-root,
.ldep-root {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
  padding: 28px;
  max-width: 860px;
  margin: 2rem auto;
  font-family: "Inter", -apple-system, sans-serif;
}
.lstk-eyebrow,
.lcfg-eyebrow,
.lcsn-eyebrow,
.larea-eyebrow,
.ldep-eyebrow {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #9d9d9c;
  margin: 0 0 6px;
}
.lstk-title,
.lcfg-title,
.lcsn-title,
.larea-title,
.ldep-title {
  font-size: 20px;
  font-weight: 700;
  color: #47577c;
  margin: 0 0 6px;
}
.lstk-subtitle,
.lcfg-subtitle,
.lcsn-subtitle,
.larea-subtitle,
.ldep-subtitle {
  font-size: 13px;
  color: #64748b;
  margin: 0 0 22px;
  line-height: 1.5;
}
.lstk-foot,
.lcfg-foot,
.lcsn-foot,
.larea-foot,
.ldep-foot {
  font-size: 11px;
  color: #9d9d9c;
  font-style: italic;
  margin: 18px 0 0;
  line-height: 1.5;
}

/* Shared pill-toggle used by ldep + lcsn */
.ldep-toggle,
.lcsn-toggle {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  background: #eef1f6;
  border-radius: 10px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.ldep-tab,
.lcsn-tab {
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 600;
  color: #64748b;
  padding: 8px 14px;
  border-radius: 7px;
  cursor: pointer;
  transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
}
.ldep-tab:hover,
.lcsn-tab:hover {
  color: #47577c;
}
.ldep-tab-active,
.lcsn-tab-active {
  background: #fff;
  color: #47577c;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

/* ============================================================
   1. lstk · laminate stack + clickable load decomposition
   ============================================================ */
.lstk-arc {
  text-align: center;
  margin-bottom: 8px;
}
.lstk-arc-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: #bf3425;
  background: #fdf2f1;
  border: 1px solid #f2c4bd;
  border-radius: 8px;
  padding: 7px 12px;
  line-height: 1.4;
}
.lstk-arrow {
  display: block;
  color: #bf3425;
  font-size: 18px;
  line-height: 1;
  margin: 4px 0 2px;
  opacity: 0;
  transition: opacity 0.5s ease 0.1s;
}
.lstk-root.lstk-animated .lstk-arrow {
  opacity: 1;
}
.lstk-hint {
  font-size: 12px;
  font-weight: 600;
  color: #47577c;
  text-align: center;
  margin: 0 0 12px;
}
.lstk-hint::before {
  content: "\1F446\00A0";
}
.lstk-stack {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.lstk-tag {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 12.5px;
  line-height: 1.45;
  color: #475569;
  padding: 8px 10px;
  text-align: left;
}
.lstk-tag-btn {
  width: 100%;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease,
    box-shadow 0.25s ease, transform 0.15s ease;
}
.lstk-tag-btn:hover {
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}
.lstk-tag-btn:active {
  transform: translateY(1px);
}
.lstk-tag-num {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: #47577c;
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.lstk-surface-tag .lstk-tag-num {
  background: #bf3425;
}
.lstk-layer,
.lstk-plies {
  border-radius: 8px;
  padding: 12px 16px;
  opacity: 0;
  transform: translateX(-14px);
  transition: opacity 0.5s ease, transform 0.5s ease, filter 0.3s ease,
    box-shadow 0.3s ease;
}
.lstk-root.lstk-animated .lstk-layer,
.lstk-root.lstk-animated .lstk-plies {
  opacity: 1;
  transform: translateX(0);
}
.lstk-layer[data-i="0"] { transition-delay: 0.05s; }
.lstk-layer[data-i="1"] { transition-delay: 0.15s; }
.lstk-plies[data-i="2"] { transition-delay: 0.25s; }
.lstk-layer[data-i="3"] { transition-delay: 0.35s; }
.lstk-layer-name {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: #1e293b;
}
.lstk-layer-spec {
  display: block;
  font-size: 12px;
  color: #64748b;
  margin-top: 2px;
}
.lstk-layer-paint {
  background: #fbe9e7;
  border: 1px solid #f2c4bd;
}
.lstk-layer-lsp {
  background: #f7dedb;
  border: 1px solid #eab3ab;
}
.lstk-plies {
  background: #eef1f6;
  border: 1px solid #cdd5e5;
  position: relative;
}
.lstk-ply-lines {
  display: flex;
  gap: 2px;
  margin-top: 10px;
}
.lstk-ply-lines span {
  flex: 1;
  height: 10px;
  background: #c8cdd8;
  border-radius: 2px;
}
.lstk-ply-lines span:first-child {
  background: #bf3425;
}
.lstk-layer-bottom {
  background: #f8fafc;
  border: 1px dashed #c8cdd8;
}
/* focus spotlight: dim everything, then un-dim the targeted layers */
.lstk-root.lstk-focus-surface .lstk-layer,
.lstk-root.lstk-focus-surface .lstk-plies,
.lstk-root.lstk-focus-core .lstk-layer,
.lstk-root.lstk-focus-core .lstk-plies {
  filter: grayscale(0.55) opacity(0.45);
}
.lstk-root.lstk-focus-surface .lstk-layer-paint,
.lstk-root.lstk-focus-surface .lstk-layer-lsp {
  filter: none;
  box-shadow: 0 0 0 2px #bf3425, 0 4px 14px rgba(191, 52, 37, 0.22);
}
.lstk-root.lstk-focus-core .lstk-plies {
  filter: none;
  box-shadow: 0 0 0 2px #47577c, 0 4px 14px rgba(71, 87, 124, 0.22);
}
.lstk-tag-btn.lstk-tag-on {
  background: #eef1f6;
  border-color: #47577c;
}
.lstk-surface-tag.lstk-tag-on {
  background: #fdf2f1;
  border-color: #bf3425;
}
@media (max-width: 640px) {
  .lstk-root { padding: 20px; }
}

/* ============================================================
   2. lcfg · configuration table (hover + click emphasis)
   ============================================================ */
.lcfg-table {
  display: flex;
  flex-direction: column;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  overflow: hidden;
}
.lcfg-head,
.lcfg-row {
  display: grid;
  grid-template-columns: 2.6fr 1fr 1fr 1fr;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
}
.lcfg-head {
  background: #47577c;
  color: #fff;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.lcfg-head .lcfg-c-lsp,
.lcfg-head .lcfg-c-paint,
.lcfg-head .lcfg-c-peak,
.lcfg-row .lcfg-c-lsp,
.lcfg-row .lcfg-c-paint,
.lcfg-row .lcfg-c-peak {
  text-align: center;
}
.lcfg-row {
  font-size: 13px;
  color: #334155;
  border-top: 1px solid #eef1f6;
  background: #fff;
  opacity: 0;
  transform: translateY(10px);
  cursor: pointer;
  transition: opacity 0.45s ease, transform 0.45s ease,
    background 0.2s ease, box-shadow 0.2s ease;
}
.lcfg-root.lcfg-animated .lcfg-row {
  opacity: 1;
  transform: translateY(0);
}
.lcfg-row[data-r="0"] { transition-delay: 0.05s; }
.lcfg-row[data-r="1"] { transition-delay: 0.12s; }
.lcfg-row[data-r="2"] { transition-delay: 0.19s; }
.lcfg-row[data-r="3"] { transition-delay: 0.26s; }
.lcfg-row[data-r="4"] { transition-delay: 0.33s; }
.lcfg-row[data-r="5"] { transition-delay: 0.40s; }
.lcfg-row[data-r="6"] { transition-delay: 0.47s; }
.lcfg-row:hover {
  background: #f4f7fb;
}
.lcfg-row.lcfg-row-sel {
  background: #eef1f6;
  box-shadow: inset 3px 0 0 #47577c;
}
.lcfg-c-purpose { font-weight: 600; color: #1e293b; }
.lcfg-c-paint,
.lcfg-c-peak { font-weight: 700; color: #47577c; }
.lcfg-row-hi { background: #fdf2f1; }
.lcfg-row-hi:hover { background: #fbe4e0; }
.lcfg-row-hi .lcfg-c-purpose { color: #bf3425; }
.lcfg-row-hi .lcfg-c-paint { color: #bf3425; }
.lcfg-none { color: #94a3b8; font-style: italic; font-weight: 500 !important; }
@media (max-width: 640px) {
  .lcfg-root { padding: 18px; }
  .lcfg-head,
  .lcfg-row { grid-template-columns: 1.8fr 0.9fr 0.9fr 0.8fr; gap: 6px; padding: 10px 10px; font-size: 11.5px; }
  .lcfg-head { font-size: 9.5px; }
}

/* ============================================================
   3. lcsn · C-Scan acoustic shadow (reveal toggle)
   ============================================================ */
.lcsn-chart-area {
  display: flex;
  justify-content: center;
}
.lcsn-panel {
  position: relative;
  width: 100%;
  max-width: 560px;
  background: linear-gradient(180deg, #eef1f6 0%, #e2e8f0 100%);
  border: 2px solid #c8cdd8;
  border-radius: 10px;
  padding: 34px 20px 44px;
}
.lcsn-face {
  display: block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #64748b;
}
.lcsn-face-top { text-align: left; margin-bottom: 18px; }
.lcsn-face-bottom { text-align: left; margin-top: 18px; }
.lcsn-delam {
  position: relative;
  height: 14px;
  border-radius: 7px;
  margin: 10px 0;
  opacity: 0;
  transform: scaleX(0.2);
  transform-origin: center;
  transition: opacity 0.5s ease, transform 0.6s ease, filter 0.4s ease;
}
.lcsn-root.lcsn-animated .lcsn-delam {
  opacity: 1;
  transform: scaleX(1);
}
.lcsn-delam-small {
  width: 34%;
  margin-left: 12%;
  background: #9d9d9c;
  transition-delay: 0.15s;
}
.lcsn-delam-large {
  width: 74%;
  margin-left: 8%;
  background: #bf3425;
  transition-delay: 0.35s;
}
.lcsn-delam-label {
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  font-size: 12px;
  color: #475569;
}
.lcsn-delam-large .lcsn-delam-label strong { color: #bf3425; }
/* mode-driven: C-Scan mode hides the small (shadowed) delam; reveal shows it */
.lcsn-lbl-cscan,
.lcsn-lbl-reveal { color: #9d9d9c; }
.lcsn-root.lcsn-mode-cscan .lcsn-delam-small {
  filter: grayscale(1) opacity(0.28);
}
.lcsn-root.lcsn-mode-cscan .lcsn-lbl-reveal { display: none; }
.lcsn-root.lcsn-mode-reveal .lcsn-lbl-cscan { display: none; }
.lcsn-root.lcsn-mode-reveal .lcsn-delam-small {
  background: #e07b2e;
  filter: none;
}
.lcsn-root.lcsn-mode-reveal .lcsn-lbl-reveal { color: #e07b2e; }
.lcsn-root.lcsn-mode-reveal .lcsn-shadow { opacity: 0.15; }
.lcsn-shadow {
  height: 26px;
  margin: 2px 12% 2px 12%;
  width: 34%;
  background: repeating-linear-gradient(
    -45deg,
    rgba(157, 157, 156, 0.28),
    rgba(157, 157, 156, 0.28) 4px,
    transparent 4px,
    transparent 8px
  );
  border-radius: 4px;
  opacity: 0;
  transition: opacity 0.5s ease 0.5s;
}
.lcsn-root.lcsn-animated .lcsn-shadow { opacity: 1; }
.lcsn-probe {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 74%;
  margin: 6px 0 0 8%;
}
.lcsn-probe-icon {
  width: 46px;
  height: 16px;
  background: #47577c;
  border-radius: 4px 4px 8px 8px;
  position: relative;
}
.lcsn-probe-icon::after {
  content: "";
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 10px solid #47577c;
}
.lcsn-probe-label {
  font-size: 11.5px;
  font-weight: 600;
  color: #47577c;
  margin-top: 6px;
}
@media (max-width: 640px) {
  .lcsn-root { padding: 20px; }
  .lcsn-delam-label { position: static; display: block; transform: none; white-space: normal; margin-top: 4px; }
  .lcsn-delam { margin-bottom: 26px; }
}

/* ============================================================
   4. larea · interactive paint-thickness slider
   ============================================================ */
.larea-interactive {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 22px;
  margin-bottom: 26px;
}
.larea-readout {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-bottom: 22px;
}
.larea-panelviz {
  flex-shrink: 0;
  text-align: center;
}
.larea-panel-square {
  position: relative;
  width: 116px;
  height: 116px;
  border-radius: 10px;
  background: repeating-linear-gradient(
      0deg,
      #dfe4ee,
      #dfe4ee 1px,
      transparent 1px,
      transparent 11px
    ),
    #eef1f6;
  border: 2px solid #c8cdd8;
  overflow: hidden;
}
.larea-blob {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, #bf3425 0%, #d8695c 70%, #e59d94 100%);
  box-shadow: 0 0 14px rgba(191, 52, 37, 0.35);
  transition: width 0.45s cubic-bezier(0.22, 1, 0.36, 1),
    height 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}
.larea-panel-cap {
  display: block;
  font-size: 10px;
  color: #9d9d9c;
  margin-top: 6px;
  max-width: 116px;
  line-height: 1.3;
}
.larea-numbers {
  display: flex;
  flex-direction: column;
}
.larea-paintnow {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #47577c;
}
.larea-big {
  font-size: 46px;
  font-weight: 800;
  color: #bf3425;
  line-height: 1.05;
  margin: 4px 0 2px;
}
.larea-big .larea-unit {
  font-size: 17px;
  font-weight: 700;
  color: #9d9d9c;
}
.larea-desc {
  font-size: 12.5px;
  color: #64748b;
}
.larea-slider-wrap {
  position: relative;
  padding: 0 2px;
}
.larea-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  border-radius: 6px;
  background: linear-gradient(90deg, #47577c 0%, #bf3425 100%);
  outline: none;
  margin: 0;
}
.larea-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid #bf3425;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.22);
  cursor: pointer;
  transition: transform 0.12s ease;
}
.larea-slider::-webkit-slider-thumb:hover {
  transform: scale(1.12);
}
.larea-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  border: 3px solid #bf3425;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.22);
  cursor: pointer;
}
.larea-ticks {
  position: relative;
  height: 18px;
  margin-top: 8px;
}
.larea-ticks span {
  position: absolute;
  transform: translateX(-50%);
  font-size: 10.5px;
  font-weight: 600;
  color: #9d9d9c;
  white-space: nowrap;
}
.larea-ticks span:last-child { transform: translateX(-100%); }
.larea-ref-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #9d9d9c;
  margin: 0 0 12px;
}
.larea-chart-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.larea-row {
  display: grid;
  grid-template-columns: 78px 1fr 92px;
  align-items: center;
  gap: 12px;
  padding: 4px 6px;
  border-radius: 8px;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}
.larea-row.larea-row-active {
  background: #eef1f6;
  box-shadow: inset 3px 0 0 #47577c;
}
.larea-label {
  font-size: 13px;
  font-weight: 700;
  color: #1e293b;
  text-align: right;
}
.larea-track {
  background: #eef1f6;
  border-radius: 6px;
  height: 24px;
  overflow: hidden;
}
.larea-fill {
  height: 100%;
  width: 0;
  background: #47577c;
  border-radius: 6px;
  transition: width 1s cubic-bezier(0.22, 1, 0.36, 1);
}
.larea-root.larea-animated .larea-fill {
  width: var(--w, 0%);
}
.larea-fill-hi { background: #bf3425; }
.larea-fill-zero { background: transparent; }
.larea-row[data-pct="0"] .larea-track {
  background: repeating-linear-gradient(
    -45deg,
    #f1f5f9,
    #f1f5f9 5px,
    #e6ebf2 5px,
    #e6ebf2 10px
  );
}
.larea-val {
  font-size: 14px;
  font-weight: 700;
  color: #47577c;
}
.larea-row-hi .larea-val { color: #bf3425; }
.larea-row-hi .larea-label { color: #bf3425; }
@media (max-width: 640px) {
  .larea-root { padding: 20px; }
  .larea-readout { flex-direction: column; gap: 14px; text-align: center; align-items: center; }
  .larea-big { font-size: 40px; }
  .larea-row { grid-template-columns: 58px 1fr 74px; gap: 8px; }
  .larea-label { font-size: 12px; }
  .larea-val { font-size: 12.5px; }
}

/* ============================================================
   5. ldep · thermal penetration depth (normal / extreme toggle)
   ============================================================ */
.ldep-chart-area {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.ldep-row {
  display: grid;
  grid-template-columns: 92px 1fr;
  align-items: center;
  gap: 14px;
}
.ldep-ply {
  font-size: 13px;
  font-weight: 700;
  color: #1e293b;
  text-align: right;
}
.ldep-track {
  position: relative;
  background: #f1f5f9;
  border-radius: 6px;
  height: 30px;
  display: flex;
  align-items: center;
}
.ldep-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #bf3425 0%, #d8695c 100%);
  border-radius: 6px;
  transition: width 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.ldep-root.ldep-animated .ldep-fill {
  width: var(--w, 0%);
}
.ldep-fill-max { background: #bf3425; }
.ldep-row-intact .ldep-track { background: #eef1f6; }
.ldep-state {
  position: absolute;
  left: 14px;
  font-size: 12px;
  font-weight: 600;
  color: #fff;
  white-space: nowrap;
  pointer-events: none;
  transition: color 0.3s ease;
}
/* when a row currently has no burn, its label sits on the empty track */
.ldep-row.ldep-empty .ldep-state {
  color: #64748b;
}
.ldep-note {
  margin-top: 18px;
  background: #f6f8fc;
  border: 1px solid #dfe4ee;
  border-left: 4px solid #47577c;
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 12.5px;
  color: #334155;
  line-height: 1.5;
  transition: background 0.3s ease, border-color 0.3s ease;
}
.ldep-note strong { color: #47577c; }
.ldep-root.ldep-mode-extreme .ldep-note {
  background: #fdf2f1;
  border-color: #f2c4bd;
  border-left-color: #bf3425;
}
.ldep-root.ldep-mode-extreme .ldep-note strong { color: #bf3425; }
@media (max-width: 640px) {
  .ldep-root { padding: 20px; }
  .ldep-row { grid-template-columns: 72px 1fr; gap: 8px; }
  .ldep-state { font-size: 10.5px; left: 10px; white-space: normal; }
}

/* ============================================================
   Accessibility — honour reduced-motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .reveal-init { opacity: 1 !important; transform: none !important; }
  .lstk-layer,
  .lstk-plies,
  .lstk-arrow,
  .lcfg-row,
  .lcsn-delam,
  .lcsn-shadow,
  .larea-fill,
  .ldep-fill,
  .larea-blob {
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .lstk-layer,
  .lstk-plies { transform: none !important; }
}