:root {
  --color-bg: #fafafa;
  --color-text: #0a0a0a;
  --color-text-secondary: #555555;
  --color-border: #0a0a0a;
  --color-accent: #2563eb;
  --font-heading: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --max-width: 1400px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style-position: inside;
}

.site-header {
  position: sticky;
  top: 0;
  background: var(--color-bg);
  border-bottom: 3px solid var(--color-text);
  z-index: 100;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.logo-hidden {
  visibility: hidden;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 0.2s;
}

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

.nav-linkedin {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.nav-linkedin svg {
  transition: transform 0.2s ease;
}

.nav-linkedin:hover svg {
  transform: scale(1.1);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.mobile-menu-btn span {
  width: 28px;
  height: 3px;
  background: var(--color-text);
  transition: all 0.3s;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg) var(--spacing-lg);
}

.hero {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.03em;
  text-transform: uppercase;
}

.hero .bio {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  align-self: end;
}

.linkedin-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--color-text);
  border-radius: 50%;
  color: var(--color-text);
  transition: all 0.2s ease;
  margin-top: var(--spacing-md);
}

.linkedin-link:hover {
  background: var(--color-text);
  color: var(--color-bg);
  transform: translateY(-2px);
}

.linkedin-link svg {
  width: 22px;
  height: 22px;
}

.projects {
  padding: var(--spacing-xl) 0;
}

.projects h2 {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.projects h2::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.project-card {
  display: block;
  border: 2px solid var(--color-border);
  transition: all 0.2s;
  position: relative;
}

.project-card:hover {
  background: var(--color-text);
  color: var(--color-bg);
}

.project-card h3 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 400;
  padding: var(--spacing-md);
  padding-bottom: var(--spacing-xs);
  line-height: 1.2;
}

.project-card p {
  font-size: 0.9rem;
  padding: 0 var(--spacing-md) var(--spacing-md);
}

.placeholder-image {
  background: #e0e0e0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.amazon-work,
.media,
.awards {
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
}

.amazon-work {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-lg);
}

.media {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-lg);
}

.awards {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-lg);
}

.amazon-work h2,
.media h2,
.awards h2 {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.amazon-work ul,
.media ul,
.awards ul {
  list-style: none;
  column-count: 2;
  column-gap: var(--spacing-lg);
}

.amazon-work li,
.media li,
.awards li {
  padding: var(--spacing-xs) 0;
  break-inside: avoid;
  font-size: 0.95rem;
}

.site-footer {
  border-top: 3px solid var(--color-text);
  padding: var(--spacing-lg) var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-email {
  font-family: var(--font-heading);
  font-size: 1.5rem;
}

.footer-email:hover {
  color: var(--color-accent);
}

.footer-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.footer-nav a {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: color 0.2s;
}

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

.about-page {
  max-width: 1000px;
}

.about-hero {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.about-hero-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 400;
  line-height: 0.95;
  text-transform: uppercase;
  margin-bottom: var(--spacing-lg);
}

.about-hero-content p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.about-hero-image img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.about-section {
  margin-top: var(--spacing-xl);
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 4px;
  padding: var(--spacing-lg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.about-section h2 {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.about-section h2::before {
  content: "";
  width: 16px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

.about-section-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.about-section-text p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.about-section-text ul {
  list-style: none;
}

.about-section-text li {
  font-size: 0.95rem;
  padding: var(--spacing-xs) 0;
}

.about-section-text li::before {
  content: "→";
  margin-right: var(--spacing-sm);
  color: var(--color-accent);
}

.about-section-image img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.contact-page {
  max-width: 700px;
}

.contact-content h1 {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 400;
  text-transform: uppercase;
  line-height: 0.95;
  margin-bottom: var(--spacing-md);
}

.contact-content>p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  max-width: 400px;
}

.contact-email {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 1.75rem;
  margin-bottom: var(--spacing-xl);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 2px;
}

.contact-email:hover {
  color: var(--color-accent);
}

.contact-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group:last-of-type {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.form-group input,
.form-group textarea {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: var(--spacing-sm);
  border: 2px solid var(--color-border);
  background: transparent;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.submit-btn {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-text);
  color: var(--color-bg);
  border: 2px solid var(--color-text);
  cursor: pointer;
  transition: all 0.2s;
  grid-column: 1;
}

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

.case-study {
  max-width: 1200px;
}

.case-study.with-toc {
  position: relative;
  max-width: 1200px;
}

.toc-sidebar {
  position: fixed;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 50;
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.toc-list {
  list-style: none;
  border-left: 1px solid rgba(0, 0, 0, 0.1);
  padding-left: 0;
  margin: 0;
}

.toc-list li {
  margin-bottom: 2px;
}

.toc-link {
  display: block;
  font-size: 0.6rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-secondary);
  padding: 4px 8px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.toc-link:hover {
  color: var(--color-text);
}

.toc-link.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  font-weight: 700;
}

.case-study-header {
  margin-bottom: var(--spacing-lg);
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-lg);
}

.case-study-header h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 400;
  line-height: 1;
  text-transform: uppercase;
}

.case-study-header .subtitle {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  grid-column: 2;
  grid-row: 1;
  align-self: end;
}

.meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  padding: var(--spacing-md) 0;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  grid-column: 1 / -1;
}

.meta.meta-4col {
  grid-template-columns: repeat(4, 1fr);
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.meta-label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text-secondary);
}

.meta-value {
  font-size: 0.9rem;
}

.hero-image {
  margin-bottom: var(--spacing-xl);
  border: 2px solid var(--color-border);
}

.case-section {
  margin-bottom: var(--spacing-lg);
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 4px;
  padding: var(--spacing-lg);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.case-section h2 {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.case-section h2::before {
  content: "";
  width: 16px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

.case-section h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 400;
  margin: var(--spacing-md) 0 var(--spacing-sm);
}

.case-section p {
  margin-bottom: var(--spacing-md);
}

.case-section ul,
.case-section ol {
  margin-bottom: var(--spacing-md);
  list-style: none;
}

.case-section li {
  margin-bottom: var(--spacing-xs);
}

.case-section ul li::before {
  content: "→";
  margin-right: var(--spacing-sm);
  color: var(--color-accent);
}

.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.comparison-col {
  padding: 0;
}

.comparison-col h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  margin-top: 0;
  color: #2a2a2a;
}

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

.comparison-col li {
  padding: var(--spacing-xs) 0;
}

.comparison-col li::before {
  content: "→";
  margin-right: var(--spacing-sm);
  color: var(--color-accent);
}

.comparison-image {
  width: 100%;
  height: auto;
  display: block;
  margin-top: var(--spacing-md);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.metric {
  text-align: center;
}

.metric-value {
  display: block;
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 400;
  line-height: 1;
  margin-bottom: var(--spacing-xs);
  color: #2a2a2a;
}

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

.challenge-list {
  list-style: none;
  column-count: 1;
}

.challenge-list li {
  padding: var(--spacing-xs) 0;
}

.challenge-list li::before {
  content: "→";
  margin-right: var(--spacing-sm);
  color: var(--color-accent);
}

.solution-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

.solution-card {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.solution-card:last-child {
  border-bottom: none;
}

.solution-card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
}

.solution-card p {
  font-size: 0.85rem;
  margin: 0;
  color: var(--color-text-secondary);
}

.goals-list {
  list-style: none;
  counter-reset: goals;
}

.goals-list li {
  counter-increment: goals;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.goals-list li::before {
  content: counter(goals, decimal-leading-zero);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-right: var(--spacing-sm);
  color: var(--color-accent);
}

.research-content {
  margin-bottom: var(--spacing-md);
  column-count: 2;
  column-gap: var(--spacing-lg);
}

.research-content h3 {
  break-after: avoid;
}

.ui-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
}

.testing-info {
  background: var(--color-text);
  color: var(--color-bg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  display: inline-block;
}

.problem-solution-grid {
  display: grid;
  gap: 0;
}

.ps-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 2px solid var(--color-border);
  border-bottom: none;
}

.ps-item:last-child {
  border-bottom: 2px solid var(--color-border);
}

.ps-problem,
.ps-solution {
  padding: var(--spacing-md);
}

.ps-problem {
  border-right: 2px solid var(--color-border);
}

.ps-item h4 {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--spacing-xs);
}

.ps-item p {
  margin: 0;
}

.scenario-steps {
  margin: var(--spacing-md) 0;
  list-style: none;
  counter-reset: steps;
}

.scenario-steps li {
  counter-increment: steps;
  padding: var(--spacing-xs) 0;
}

.scenario-steps li::before {
  content: counter(steps);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin-right: var(--spacing-sm);
  color: var(--color-accent);
}

.case-nav {
  padding-top: var(--spacing-lg);
  border-top: 2px solid var(--color-border);
  display: flex;
  justify-content: space-between;
}

.case-nav a {
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.hero-image,
.section-image {
  width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-md) 0;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.hero-image {
  margin-bottom: var(--spacing-xl);
}

.prototype-embed {
  width: 100%;
  aspect-ratio: 16 / 9;
  margin: var(--spacing-md) 0;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
  overflow: hidden;
}

.prototype-embed iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.prototype-link {
  display: inline-block;
  margin-top: var(--spacing-sm);
  color: var(--color-accent);
  text-decoration: underline;
  font-size: 0.95rem;
}

.prototype-link:hover {
  opacity: 0.75;
}

.goals-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin-top: var(--spacing-md);
}

.goal-card {
  padding: var(--spacing-md);
  border: 2px solid var(--color-border);
  border-right: none;
}

.goal-card:last-child {
  border-right: 2px solid var(--color-border);
}

.goal-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.goal-card p {
  margin: 0;
  font-size: 0.9rem;
}

.pain-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.pain-point {
  text-align: center;
}

.pain-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: #2a2a2a;
  margin-bottom: var(--spacing-xs);
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.image-gallery img,
.gallery-image {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.ui-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.ui-gallery img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.additional-gallery {
  margin: var(--spacing-md) 0;
}

.additional-gallery img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

@media (max-width: 768px) {
  .site-header {
    position: relative;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--spacing-md);
    border-bottom: 3px solid var(--color-border);
    display: none;
  }

  .nav-links.open {
    display: flex;
  }

  .mobile-menu-btn.open span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }

  .mobile-menu-btn.open span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-btn.open span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .project-grid {
    grid-template-columns: 1fr;
  }

  .project-card:first-child {
    grid-row: auto;
  }

  .amazon-work,
  .media,
  .awards {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .amazon-work ul,
  .media ul,
  .awards ul {
    column-count: 1;
  }

  .about-hero {
    grid-template-columns: 1fr;
  }

  .about-hero-image {
    order: -1;
    max-width: 300px;
  }

  .about-section-content {
    grid-template-columns: 1fr;
  }

  .case-study-header {
    grid-template-columns: 1fr;
  }

  .case-study-header .subtitle {
    grid-column: 1;
    grid-row: auto;
  }

  .meta {
    grid-template-columns: 1fr 1fr;
  }

  .comparison-grid,
  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .metric {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  }

  .metric:last-child {
    border-bottom: none;
  }

  .ps-item {
    grid-template-columns: 1fr;
  }

  .ps-problem {
    border-right: none;
    border-bottom: 2px solid var(--color-border);
  }

  .challenge-list,
  .research-content {
    column-count: 1;
  }

  .ui-gallery {
    grid-template-columns: 1fr;
  }

  .contact-form {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .goals-grid {
    grid-template-columns: 1fr;
  }

  .goal-card {
    border-right: 2px solid var(--color-border);
    border-bottom: none;
  }

  .goal-card:last-child {
    border-bottom: 2px solid var(--color-border);
  }

  .pain-points {
    grid-template-columns: 1fr;
  }

  .image-gallery {
    grid-template-columns: 1fr;
  }

  .toc-sidebar {
    display: none;
  }
}

.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 3rem;
  color: #fff;
  background: none;
  border: none;
  cursor: pointer;
  line-height: 1;
}

.lightbox-close:hover {
  color: var(--color-accent);
}

.collapsible .section-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.collapsible .section-toggle::after {
  content: "−";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform 0.3s;
}

.collapsible:not(.open) .section-toggle::after {
  content: "+";
}

.collapsible .section-content {
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
  max-height: 10000px;
  opacity: 1;
}

.collapsible:not(.open) .section-content {
  max-height: 0;
  opacity: 0;
}

.two-column-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.two-column-grid .column h3 {
  margin-top: 0;
}

.two-column-grid .column .challenge-list {
  column-count: 1;
}

.two-column-grid .solution-grid {
  grid-template-columns: 1fr;
}

.two-column-grid .solution-card {
  border-right: 2px solid var(--color-border);
  border-bottom: none;
}

.two-column-grid .solution-card:last-child {
  border-bottom: 2px solid var(--color-border);
}

.goals-grid-clean {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.goal-item {
  text-align: center;
}

.goal-label {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: #2a2a2a;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.goal-item p {
  margin: 0;
  font-size: 0.95rem;
  max-width: none;
}

.goals-grid-clean+p,
.goals-grid-clean p {
  max-width: none;
}

.subsection-row {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-lg);
  align-items: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.subsection-text h3 {
  margin-top: 0;
  font-size: 1.25rem;
}

.subsection-text p {
  margin-bottom: 0;
}

.subsection-image img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.subsection-full {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.subsection-full h3 {
  margin-top: 0;
  font-size: 1.25rem;
}

.subsection-first {
  margin-top: 0;
}

.subsection-first h3 {
  margin-top: 0;
  font-size: 1.25rem;
}

.ui-gallery-compact {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

.ui-gallery-compact img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 2px;
}

.two-image-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
  max-width: 70%;
}

.two-image-row img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.three-image-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.three-image-row img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.single-column-images {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.single-column-images img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

.grid-2x3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.grid-2x3 img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 4px;
}

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

  .goals-grid-clean {
    grid-template-columns: 1fr;
  }

  .subsection-row {
    grid-template-columns: 1fr;
  }

  .ui-gallery-compact {
    grid-template-columns: repeat(2, 1fr);
  }

  .two-image-row {
    grid-template-columns: 1fr;
  }

  .three-image-row {
    grid-template-columns: 1fr;
  }

  .grid-2x3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .toc-sidebar {
    display: none;
  }

  .meta.meta-4col {
    grid-template-columns: repeat(2, 1fr);
  }
}

.password-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.password-overlay.hidden {
  display: none;
}

.password-container {
  text-align: center;
  max-width: 400px;
  padding: var(--spacing-lg);
}

.password-container h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 400;
  text-transform: uppercase;
  margin-bottom: var(--spacing-sm);
}

.password-container p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.password-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.password-input {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 2px solid var(--color-border);
  background: transparent;
  text-align: center;
  transition: border-color 0.2s;
}

.password-input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.password-submit {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-text);
  color: var(--color-bg);
  border: 2px solid var(--color-text);
  cursor: pointer;
  transition: all 0.2s;
}

.password-submit:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.password-error {
  color: #dc2626;
  font-size: 0.85rem;
  display: none;
}

.password-error.show {
  display: block;
}

.lead-text {
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
}