/* ==========================================================================
   CASE STUDY COMPONENT SYSTEM
   Reusable CSS components for UX/UI case study pages.
   All components support light + dark mode via CSS custom properties.
   ========================================================================== */

/* --------------------------------------------------------------------------
   01. CASE STUDY — SECTION NAVIGATION (Sticky sidebar / Mobile scroll)
   -------------------------------------------------------------------------- */
.cs-nav {
  position: sticky;
  top: 90px;
  align-self: start;
  padding: 20px 0;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--accent, #FFB646) transparent;
  z-index: 5;
  flex-shrink: 0;
}

.cs-nav__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cs-nav__link {
  display: block;
  padding: 10px 16px;
  font-family: "DM Sans", sans-serif;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted, #696969);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  transition: all 0.25s ease;
  line-height: 1.4;
}

.cs-nav__link:hover {
  color: var(--text-primary, #1A1A1A);
  background: var(--accent-subtle, rgba(255, 182, 70, 0.1));
}

.cs-nav__link.active {
  color: var(--accent, #FFB646);
  border-left-color: var(--accent, #FFB646);
  font-weight: 600;
  background: var(--accent-subtle, rgba(255, 182, 70, 0.1));
}

/* Mobile: horizontal scroll nav */
@media (max-width: 991px) {
  .cs-nav {
    position: sticky;
    top: 62px;
    z-index: 10;
    background: var(--bg-primary, #FAFAF9);
    border-bottom: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
    padding: 0;
    max-height: none;
    overflow-y: visible;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    background: rgba(250, 250, 249, 0.92);
  }

  .cs-nav__list {
    flex-direction: row;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 0;
    padding: 0 16px;
  }

  .cs-nav__list::-webkit-scrollbar {
    display: none;
  }

  .cs-nav__link {
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    padding: 14px 14px;
    font-size: 12px;
    transition: all 0.2s ease;
  }

  .cs-nav__link.active {
    border-left-color: transparent;
    border-bottom-color: var(--accent, #FFB646);
  }
}

/* --------------------------------------------------------------------------
   02. CASE STUDY — LAYOUT (Two-column: nav + content)
   -------------------------------------------------------------------------- */
.cs-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  align-items: start;
}

@media (max-width: 1199px) {
  .cs-layout {
    grid-template-columns: 180px 1fr;
    gap: 32px;
  }
}

@media (max-width: 991px) {
  .cs-layout {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0;
  }
}

.cs-content {
  min-width: 0;
  overflow-wrap: break-word;
  word-wrap: break-word;
}

/* --------------------------------------------------------------------------
   03. CASE STUDY — SECTION (Base section wrapper)
   -------------------------------------------------------------------------- */
.cs-section {
  padding: 80px 0;
  scroll-margin-top: 100px;
}

.cs-section + .cs-section {
  border-top: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
}

@media (max-width: 767px) {
  .cs-section {
    padding: 48px 16px;
    scroll-margin-top: 120px;
  }
}

.cs-section__label {
  font-family: "DM Sans", sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent, #FFB646);
  margin-bottom: 12px;
  display: block;
}

.cs-section__title {
  font-family: "Syne", sans-serif;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.cs-section__subtitle {
  font-family: "DM Sans", sans-serif;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 400;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.6;
  max-width: 720px;
  margin-bottom: 40px;
}

/* --------------------------------------------------------------------------
   04. CASE STUDY — HERO
   -------------------------------------------------------------------------- */
.cs-hero {
  padding: 120px 0 80px;
  background: var(--bg-subtle, #F5F5F0);
  overflow: hidden;
}

@media (max-width: 767px) {
  .cs-hero {
    padding: 100px 16px 48px;
  }
}

.cs-hero__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 767px) {
  .cs-hero__inner {
    padding: 0;
  }
}

.cs-hero__category {
  font-family: "DM Sans", sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent, #FFB646);
  margin-bottom: 16px;
  display: block;
}

.cs-hero__title {
  font-family: "Syne", sans-serif;
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 800;
  color: var(--text-heading, #1A1A1A);
  line-height: 1.05;
  margin-bottom: 20px;
  letter-spacing: -2px;
}

.cs-hero__tagline {
  font-family: "DM Sans", sans-serif;
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 400;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
  max-width: 640px;
  margin-bottom: 40px;
}

.cs-hero__image {
  width: 100%;
  border-radius: 16px;
  margin-top: 48px;
  box-shadow: var(--shadow-xl, 0 20px 60px rgba(0,0,0,0.12));
  overflow: hidden;
}

.cs-hero__image img {
  width: 100%;
  height: auto;
  display: block;
}

/* --------------------------------------------------------------------------
   05. CASE STUDY — PROJECT META
   -------------------------------------------------------------------------- */
.cs-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 24px;
  padding: 32px 0;
}

@media (max-width: 575px) {
  .cs-meta {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

.cs-meta__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cs-meta__label {
  font-family: "DM Sans", sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted, #696969);
}

.cs-meta__value {
  font-family: "DM Sans", sans-serif;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary, #1A1A1A);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   06. CASE STUDY — PROBLEM SECTION
   -------------------------------------------------------------------------- */
.cs-problem__statement {
  font-family: "Syne", sans-serif;
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 600;
  color: var(--text-heading, #1A1A1A);
  line-height: 1.4;
  padding: 32px;
  border-left: 4px solid var(--accent, #FFB646);
  background: var(--accent-subtle, rgba(255, 182, 70, 0.1));
  border-radius: 0 12px 12px 0;
  margin: 32px 0;
}

.cs-problem__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.cs-problem__card {
  padding: 28px;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  border-radius: 12px;
  background: var(--bg-card, #FFFFFF);
  transition: all 0.3s ease;
}

.cs-problem__card:hover {
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.08));
  transform: translateY(-2px);
}

.cs-problem__card-icon {
  font-size: 28px;
  margin-bottom: 12px;
  display: block;
}

.cs-problem__card-title {
  font-family: "Syne", sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 8px;
}

.cs-problem__card-text {
  font-size: 14px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   07. CASE STUDY — GOALS GRID (Business + User)
   -------------------------------------------------------------------------- */
.cs-goals {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 32px;
}

@media (max-width: 767px) {
  .cs-goals {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}

.cs-goals__group {
  padding: 32px;
  border-radius: 16px;
  background: var(--bg-card, #FFFFFF);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
}

.cs-goals__group-title {
  font-family: "Syne", sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.cs-goals__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cs-goals__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 15px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
}

.cs-goals__item::before {
  content: "→";
  color: var(--accent, #FFB646);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* --------------------------------------------------------------------------
   08. CASE STUDY — RESEARCH SECTION
   -------------------------------------------------------------------------- */
.cs-research__methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.cs-research__method {
  padding: 24px;
  border-radius: 12px;
  background: var(--bg-card, #FFFFFF);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  text-align: center;
  transition: all 0.3s ease;
}

.cs-research__method:hover {
  border-color: var(--accent, #FFB646);
  box-shadow: var(--shadow-sm, 0 1px 2px rgba(0,0,0,0.05));
}

.cs-research__method-icon {
  font-size: 32px;
  margin-bottom: 12px;
  display: block;
}

.cs-research__method-name {
  font-family: "Syne", sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 6px;
}

.cs-research__method-desc {
  font-size: 13px;
  color: var(--text-muted, #696969);
  line-height: 1.4;
}

.cs-illustrative {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--accent-subtle, rgba(255, 182, 70, 0.1));
  border: 1px solid var(--accent, #FFB646);
  border-radius: 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--accent, #FFB646);
  margin-bottom: 16px;
}

/* --------------------------------------------------------------------------
   09. CASE STUDY — PERSONA CARD
   -------------------------------------------------------------------------- */
.cs-personas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

@media (max-width: 575px) {
  .cs-personas {
    grid-template-columns: 1fr;
  }
}

.cs-persona {
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  border-radius: 16px;
  overflow: hidden;
  background: var(--bg-card, #FFFFFF);
}

.cs-persona__header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px;
  background: var(--bg-subtle, #F5F5F0);
  border-bottom: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
}

.cs-persona__avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent, #FFB646);
}

.cs-persona__name {
  font-family: "Syne", sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
}

.cs-persona__role {
  font-size: 13px;
  color: var(--text-muted, #696969);
  margin-top: 2px;
}

.cs-persona__body {
  padding: 24px;
}

.cs-persona__bio {
  font-size: 14px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.6;
  margin-bottom: 20px;
  font-style: italic;
}

.cs-persona__section-title {
  font-family: "DM Sans", sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent, #FFB646);
  margin-bottom: 8px;
  margin-top: 16px;
}

.cs-persona__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cs-persona__tag {
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  background: var(--bg-subtle, #F5F5F0);
  color: var(--text-secondary, #4A4A4A);
  border: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
}

/* --------------------------------------------------------------------------
   10. CASE STUDY — EMPATHY MAP
   -------------------------------------------------------------------------- */
.cs-empathy-map {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  background: var(--border-default, rgba(8, 8, 8, 0.12));
  border-radius: 16px;
  overflow: hidden;
  margin-top: 32px;
}

@media (max-width: 575px) {
  .cs-empathy-map {
    grid-template-columns: 1fr;
  }
}

.cs-empathy-map__quadrant {
  padding: 28px;
  background: var(--bg-card, #FFFFFF);
}

.cs-empathy-map__label {
  font-family: "Syne", sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--accent, #FFB646);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.cs-empathy-map__items {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cs-empathy-map__item {
  font-size: 14px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
  padding-left: 16px;
  position: relative;
}

.cs-empathy-map__item::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--accent, #FFB646);
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   11. CASE STUDY — JOURNEY MAP
   -------------------------------------------------------------------------- */
.cs-journey {
  overflow-x: auto;
  margin-top: 32px;
  -webkit-overflow-scrolling: touch;
}

.cs-journey__table {
  width: 100%;
  min-width: 800px;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
}

.cs-journey__table th {
  padding: 16px 20px;
  font-family: "Syne", sans-serif;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-inverse, #FFFFFF);
  background: var(--bg-inverse, #080808);
  text-align: left;
}

.cs-journey__table td {
  padding: 16px 20px;
  font-size: 13px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
  background: var(--bg-card, #FFFFFF);
  border-bottom: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
  vertical-align: top;
}

.cs-journey__table tr:last-child td {
  border-bottom: none;
}

.cs-journey__emotion {
  display: inline-block;
  font-size: 20px;
}

/* --------------------------------------------------------------------------
   12. CASE STUDY — COMPETITIVE ANALYSIS
   -------------------------------------------------------------------------- */
.cs-competitive {
  overflow-x: auto;
  margin-top: 32px;
  -webkit-overflow-scrolling: touch;
}

.cs-competitive__table {
  width: 100%;
  min-width: 700px;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
}

.cs-competitive__table th {
  padding: 14px 18px;
  font-family: "Syne", sans-serif;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  background: var(--bg-subtle, #F5F5F0);
  text-align: left;
  border-bottom: 2px solid var(--border-default, rgba(8, 8, 8, 0.12));
}

.cs-competitive__table td {
  padding: 14px 18px;
  font-size: 13px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
  background: var(--bg-card, #FFFFFF);
  border-bottom: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
}

.cs-competitive__table tr:last-child td {
  border-bottom: none;
}

/* --------------------------------------------------------------------------
   13. CASE STUDY — IA / SITEMAP (Visual tree)
   -------------------------------------------------------------------------- */
.cs-ia {
  padding: 40px;
  background: var(--bg-card, #FFFFFF);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  border-radius: 16px;
  margin-top: 32px;
  overflow-x: auto;
}

.cs-ia__tree {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  min-width: 600px;
}

.cs-ia__node {
  padding: 12px 24px;
  border-radius: 8px;
  font-family: "DM Sans", sans-serif;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  background: var(--bg-inverse, #080808);
  color: var(--text-inverse, #FFFFFF);
}

.cs-ia__node--secondary {
  background: var(--accent, #FFB646);
  color: var(--text-on-accent, #1A1A1A);
}

.cs-ia__node--tertiary {
  background: var(--bg-subtle, #F5F5F0);
  color: var(--text-primary, #1A1A1A);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
}

.cs-ia__children {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.cs-ia__connector {
  width: 2px;
  height: 24px;
  background: var(--border-strong, rgba(8, 8, 8, 0.25));
  margin: 0 auto;
}

/* --------------------------------------------------------------------------
   14. CASE STUDY — USER FLOW
   -------------------------------------------------------------------------- */
.cs-flow {
  padding: 40px;
  background: var(--bg-card, #FFFFFF);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  border-radius: 16px;
  margin-top: 32px;
  overflow-x: auto;
}

.cs-flow__diagram {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 700px;
  flex-wrap: wrap;
  justify-content: center;
}

.cs-flow__step {
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  text-align: center;
  background: var(--bg-subtle, #F5F5F0);
  color: var(--text-primary, #1A1A1A);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  min-width: 120px;
}

.cs-flow__step--start {
  background: var(--accent, #FFB646);
  color: var(--text-on-accent, #1A1A1A);
  border-color: var(--accent, #FFB646);
  border-radius: 24px;
}

.cs-flow__step--decision {
  background: var(--bg-elevated, #FFFFFF);
  border: 2px solid var(--accent, #FFB646);
  transform: rotate(0deg);
}

.cs-flow__step--end {
  background: var(--success, #4CAF50);
  color: #FFFFFF;
  border-color: var(--success, #4CAF50);
  border-radius: 24px;
}

.cs-flow__arrow {
  color: var(--text-muted, #696969);
  font-size: 20px;
  flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   15. CASE STUDY — WIREFRAME GALLERY
   -------------------------------------------------------------------------- */
.cs-wireframes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.cs-wireframes__item {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  background: var(--bg-card, #FFFFFF);
  transition: all 0.3s ease;
}

.cs-wireframes__item:hover {
  box-shadow: var(--shadow-lg, 0 8px 30px rgba(0,0,0,0.1));
  transform: translateY(-4px);
}

.cs-wireframes__img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--bg-subtle, #F5F5F0);
}

.cs-wireframes__caption {
  padding: 16px;
  font-size: 13px;
  color: var(--text-muted, #696969);
  text-align: center;
}

/* --------------------------------------------------------------------------
   16. CASE STUDY — DESIGN SYSTEM
   -------------------------------------------------------------------------- */
.cs-design-system__row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 24px;
  margin-bottom: 40px;
}

.cs-color-swatch {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
}

.cs-color-swatch__preview {
  height: 80px;
  width: 100%;
}

.cs-color-swatch__info {
  padding: 12px;
  background: var(--bg-card, #FFFFFF);
}

.cs-color-swatch__name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-heading, #1A1A1A);
}

.cs-color-swatch__value {
  font-size: 12px;
  color: var(--text-muted, #696969);
  font-family: monospace;
}

.cs-typography-sample {
  padding: 20px;
  border-bottom: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
}

.cs-typography-sample__label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted, #696969);
  margin-bottom: 8px;
}

.cs-component-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.cs-component-card {
  padding: 20px;
  border-radius: 10px;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  background: var(--bg-card, #FFFFFF);
  text-align: center;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary, #4A4A4A);
}

/* --------------------------------------------------------------------------
   17. CASE STUDY — SCREEN GALLERY (Large mockups)
   -------------------------------------------------------------------------- */
.cs-screens {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 32px;
}

.cs-screen {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg, 0 8px 30px rgba(0,0,0,0.1));
  border: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
}

.cs-screen img {
  width: 100%;
  height: auto;
  display: block;
}

.cs-screen__caption {
  padding: 20px 24px;
  background: var(--bg-card, #FFFFFF);
  border-top: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
}

.cs-screen__caption-title {
  font-family: "Syne", sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 4px;
}

.cs-screen__caption-text {
  font-size: 14px;
  color: var(--text-muted, #696969);
}

/* --------------------------------------------------------------------------
   18. CASE STUDY — TESTING SECTION
   -------------------------------------------------------------------------- */
.cs-testing__findings {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 32px;
}

.cs-testing__finding {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 20px;
  align-items: start;
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  background: var(--bg-card, #FFFFFF);
}

@media (max-width: 767px) {
  .cs-testing__finding {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

.cs-testing__finding-number {
  font-family: "Syne", sans-serif;
  font-size: 14px;
  font-weight: 800;
  color: var(--accent, #FFB646);
  min-width: 32px;
}

.cs-testing__finding-issue {
  font-size: 14px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
}

.cs-testing__finding-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-muted, #696969);
  margin-bottom: 4px;
}

.cs-testing__finding-fix {
  font-size: 14px;
  color: var(--success, #4CAF50);
  font-weight: 500;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   19. CASE STUDY — BEFORE / AFTER
   -------------------------------------------------------------------------- */
.cs-before-after {
  display: flex;
  flex-direction: column;
  gap: 40px;
  margin-top: 32px;
}

.cs-before-after__pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 767px) {
  .cs-before-after__pair {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.cs-before-after__side {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
}

.cs-before-after__badge {
  padding: 8px 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-align: center;
}

.cs-before-after__badge--before {
  background: var(--error, #F44336);
  color: #FFFFFF;
}

.cs-before-after__badge--after {
  background: var(--success, #4CAF50);
  color: #FFFFFF;
}

.cs-before-after__img {
  width: 100%;
  height: auto;
  display: block;
}

.cs-before-after__desc {
  padding: 16px;
  font-size: 14px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.5;
  background: var(--bg-card, #FFFFFF);
}

/* --------------------------------------------------------------------------
   20. CASE STUDY — IMPACT / METRICS
   -------------------------------------------------------------------------- */
.cs-impact__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.cs-impact__card {
  padding: 28px;
  border-radius: 12px;
  background: var(--bg-card, #FFFFFF);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  text-align: center;
  transition: all 0.3s ease;
}

.cs-impact__card:hover {
  border-color: var(--accent, #FFB646);
  transform: translateY(-2px);
}

.cs-impact__icon {
  font-size: 32px;
  margin-bottom: 12px;
  display: block;
}

.cs-impact__metric {
  font-family: "Syne", sans-serif;
  font-size: 28px;
  font-weight: 800;
  color: var(--accent, #FFB646);
  margin-bottom: 8px;
}

.cs-impact__label {
  font-size: 14px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   21. CASE STUDY — INSIGHTS / LEARNINGS
   -------------------------------------------------------------------------- */
.cs-insights {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-top: 32px;
}

.cs-insight {
  padding: 32px;
  border-radius: 16px;
  background: var(--bg-card, #FFFFFF);
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: start;
  transition: all 0.3s ease;
}

.cs-insight:hover {
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.08));
}

@media (max-width: 575px) {
  .cs-insight {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 24px;
  }
}

.cs-insight__number {
  font-family: "Syne", sans-serif;
  font-size: 48px;
  font-weight: 800;
  color: var(--accent, #FFB646);
  line-height: 1;
  opacity: 0.4;
}

.cs-insight__title {
  font-family: "Syne", sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 8px;
}

.cs-insight__text {
  font-size: 15px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.6;
}

.cs-reflection {
  padding: 40px;
  border-radius: 16px;
  background: var(--bg-subtle, #F5F5F0);
  border: 1px solid var(--border-subtle, rgba(8, 8, 8, 0.06));
  margin-top: 40px;
}

.cs-reflection__title {
  font-family: "Syne", sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 16px;
}

.cs-reflection__text {
  font-size: 16px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   22. CASE STUDY — NEXT PROJECT
   -------------------------------------------------------------------------- */
.cs-next-project {
  padding: 80px 0;
  text-align: center;
}

@media (max-width: 767px) {
  .cs-next-project {
    padding: 48px 16px;
  }
}

.cs-next-project__label {
  font-family: "DM Sans", sans-serif;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted, #696969);
  margin-bottom: 16px;
}

.cs-next-project__card {
  display: block;
  max-width: 800px;
  margin: 0 auto;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  background: var(--bg-card, #FFFFFF);
  text-decoration: none;
  transition: all 0.4s ease;
}

.cs-next-project__card:hover {
  box-shadow: var(--shadow-xl, 0 20px 60px rgba(0,0,0,0.12));
  transform: translateY(-6px);
}

.cs-next-project__image {
  width: 100%;
  height: 320px;
  object-fit: cover;
  display: block;
}

@media (max-width: 767px) {
  .cs-next-project__image {
    height: 200px;
  }
}

.cs-next-project__info {
  padding: 28px;
  text-align: left;
}

.cs-next-project__name {
  font-family: "Syne", sans-serif;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 8px;
}

.cs-next-project__desc {
  font-size: 15px;
  color: var(--text-secondary, #4A4A4A);
}

.cs-next-project__back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 32px;
  font-family: "DM Sans", sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted, #696969);
  text-decoration: none;
  transition: color 0.3s ease;
}

.cs-next-project__back:hover {
  color: var(--accent, #FFB646);
}

/* --------------------------------------------------------------------------
   23. CASE STUDY — ACCESSIBILITY SECTION
   -------------------------------------------------------------------------- */
.cs-a11y__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.cs-a11y__item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px;
  border-radius: 10px;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  background: var(--bg-card, #FFFFFF);
}

.cs-a11y__icon {
  font-size: 24px;
  flex-shrink: 0;
}

.cs-a11y__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 4px;
}

.cs-a11y__desc {
  font-size: 13px;
  color: var(--text-muted, #696969);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   24. CASE STUDY — DESIGN EXPLORATION
   -------------------------------------------------------------------------- */
.cs-exploration {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.cs-exploration__direction {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  background: var(--bg-card, #FFFFFF);
  transition: all 0.3s ease;
}

.cs-exploration__direction--selected {
  border-color: var(--accent, #FFB646);
  border-width: 2px;
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0,0,0,0.08));
}

.cs-exploration__preview {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
  background: var(--bg-subtle, #F5F5F0);
}

.cs-exploration__info {
  padding: 20px;
}

.cs-exploration__label {
  font-family: "Syne", sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 8px;
}

.cs-exploration__desc {
  font-size: 13px;
  color: var(--text-muted, #696969);
  line-height: 1.5;
}

.cs-exploration__selected-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--accent, #FFB646);
  color: var(--text-on-accent, #1A1A1A);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 10px;
}

/* --------------------------------------------------------------------------
   25. CASE STUDY — INTERACTION DESIGN
   -------------------------------------------------------------------------- */
.cs-interactions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.cs-interaction {
  padding: 24px;
  border-radius: 12px;
  border: 1px solid var(--border-default, rgba(8, 8, 8, 0.12));
  background: var(--bg-card, #FFFFFF);
  text-align: center;
}

.cs-interaction__icon {
  font-size: 28px;
  margin-bottom: 12px;
  display: block;
}

.cs-interaction__name {
  font-family: "Syne", sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 6px;
}

.cs-interaction__desc {
  font-size: 13px;
  color: var(--text-muted, #696969);
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   26. UTILITIES & ANIMATIONS
   -------------------------------------------------------------------------- */

/* Scroll reveal base */
.cs-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.cs-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .cs-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Image hover zoom */
.cs-img-zoom {
  overflow: hidden;
}

.cs-img-zoom img {
  transition: transform 0.5s ease;
}

.cs-img-zoom:hover img {
  transform: scale(1.03);
}

/* Prose text styling for long-form content */
.cs-prose {
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-secondary, #4A4A4A);
}

.cs-prose p {
  margin-bottom: 16px;
}

.cs-prose strong {
  color: var(--text-heading, #1A1A1A);
  font-weight: 600;
}

.cs-prose ul,
.cs-prose ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.cs-prose li {
  margin-bottom: 8px;
}

/* Divider */
.cs-divider {
  height: 1px;
  background: var(--border-default, rgba(8, 8, 8, 0.12));
  margin: 48px 0;
  border: none;
}

@media (max-width: 767px) {
  .cs-flow__diagram {
    min-width: unset;
    flex-wrap: wrap;
    gap: 12px;
  }
  
  .cs-flow__step {
    min-width: unset;
    flex: 1 1 calc(50% - 8px);
  }
  
  .cs-flow__arrow {
    display: none;
  }
  
  .cs-ia__tree {
    min-width: unset;
  }
  
  .cs-ia__children {
    flex-direction: column;
    align-items: center;
  }
  
  .cs-problem__cards {
    grid-template-columns: 1fr;
  }
  
  .cs-problem__statement {
    padding: 24px;
    font-size: clamp(18px, 4vw, 24px);
  }
  
  .cs-impact__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cs-reflection {
    padding: 24px;
  }
  
  .cs-exploration {
    grid-template-columns: 1fr;
  }
  
  .cs-interaction {
    padding: 16px;
  }
  
  .cs-a11y__grid {
    grid-template-columns: 1fr;
  }
  
  .cs-wireframes {
    grid-template-columns: 1fr;
  }
  
  .cs-design-system__row {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .cs-goals__group {
    padding: 24px;
  }
  
  .cs-persona__header {
    padding: 16px;
  }
  
  .cs-persona__body {
    padding: 16px;
  }
  
  .cs-next-project__info {
    padding: 20px;
  }
  
  .cs-next-project__name {
    font-size: 20px;
  }
  
  .cs-screen__caption {
    padding: 16px;
  }
  
  .cs-insight {
    padding: 20px;
  }
  
  .cs-insight__number {
    font-size: 36px;
  }
}

/* --------------------------------------------------------------------------
   27. PLACEHOLDER COMPONENT (for wireframes / missing images)
   -------------------------------------------------------------------------- */
.cs-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle, #F5F5F0);
  border: 2px dashed var(--border-default, rgba(8, 8, 8, 0.12));
  border-radius: 12px;
  min-height: 180px;
  color: var(--text-muted, #696969);
  font-size: 13px;
  font-weight: 500;
  text-align: center;
  padding: 20px;
}

.cs-placeholder--tall {
  min-height: 280px;
}

.cs-placeholder__label {
  opacity: 0.6;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 11px;
}

/* --------------------------------------------------------------------------
   28. TEXT OVERFLOW PREVENTION (Global)
   -------------------------------------------------------------------------- */
.cs-section,
.cs-problem__card,
.cs-research__method,
.cs-persona__body,
.cs-empathy-map__quadrant,
.cs-impact__card,
.cs-insight,
.cs-goals__group,
.cs-testing__finding,
.cs-col-box,
.cs-flow__step,
.cs-ia__node {
  min-width: 0;
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
}

/* --------------------------------------------------------------------------
   29. CARD CONTENT HIERARCHY — Vertical structure with spacing
   -------------------------------------------------------------------------- */
.cs-problem__card {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.cs-problem__card-icon {
  font-size: 28px;
  margin-bottom: 14px;
  display: block;
  line-height: 1;
}

.cs-problem__card-title {
  font-family: "Syne", sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-heading, #1A1A1A);
  margin-bottom: 10px;
  line-height: 1.3;
}

.cs-problem__card-text {
  font-size: 14px;
  color: var(--text-secondary, #4A4A4A);
  line-height: 1.6;
  margin-bottom: 0;
  flex-grow: 1;
}

/* Research method cards — vertical hierarchy */
.cs-research__method {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 24px 20px;
}

.cs-research__method-icon {
  font-size: 28px;
  margin-bottom: 14px;
  display: block;
  line-height: 1;
}

.cs-research__method-name {
  margin-bottom: 8px;
}

/* Impact cards — vertical hierarchy */
.cs-impact__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 28px 20px;
}

.cs-impact__icon {
  margin-bottom: 14px;
}

.cs-impact__metric {
  margin-bottom: 10px;
}

/* Insight cards — flex fix for content structure */
.cs-insight {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
}

.cs-insight > .cs-insight__title,
.cs-insight > .cs-insight__text {
  grid-column: 2;
}

/* Testing finding cards — stacking fix */
.cs-testing__finding {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px;
}

.cs-testing__finding-number {
  margin-bottom: 4px;
}

/* --------------------------------------------------------------------------
   30. RESPONSIVE TYPOGRAPHY SCALING
   -------------------------------------------------------------------------- */
@media (max-width: 991px) {
  .cs-hero__title {
    font-size: clamp(32px, 6vw, 56px);
    letter-spacing: -1px;
  }

  .cs-hero__tagline {
    font-size: clamp(16px, 2.5vw, 20px);
  }

  .cs-section__title {
    font-size: clamp(24px, 4vw, 36px);
  }

  .cs-problem__statement {
    font-size: clamp(18px, 3vw, 24px);
    padding: 24px;
  }
}

@media (max-width: 767px) {
  .cs-hero {
    padding: 90px 16px 40px;
  }

  .cs-hero__inner {
    padding: 0;
  }

  .cs-hero__image {
    margin-top: 32px;
    border-radius: 12px;
  }

  .cs-section {
    padding: 48px 16px;
    scroll-margin-top: 110px;
  }

  /* Stack persona cards */
  .cs-personas {
    grid-template-columns: 1fr;
  }

  /* Stack problem cards */
  .cs-problem__cards {
    grid-template-columns: 1fr;
  }

  /* Stack research methods to 2-col */
  .cs-research__methods {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  /* Impact grid 2-col */
  .cs-impact__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  /* Testing findings */
  .cs-testing__finding {
    padding: 20px;
  }

  /* Goals stack */
  .cs-goals {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .cs-goals__group {
    padding: 20px;
  }

  /* Empathy map single column */
  .cs-empathy-map {
    grid-template-columns: 1fr;
  }

  /* Color swatches 2-col */
  .cs-design-system__row {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  /* IA tree allow scroll */
  .cs-ia {
    padding: 24px 16px;
  }

  .cs-ia__tree {
    min-width: unset;
  }

  .cs-ia__children {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  /* Flow diagram mobile */
  .cs-flow {
    padding: 24px 16px;
  }

  .cs-flow__diagram {
    min-width: unset;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: flex-start;
  }

  .cs-flow__step {
    min-width: unset;
    flex: 1 1 calc(50% - 8px);
    font-size: 12px;
    padding: 10px 14px;
  }

  .cs-flow__arrow {
    display: none;
  }

  /* Insights stack vertical */
  .cs-insight {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px;
  }

  .cs-insight__number {
    font-size: 32px;
  }

  .cs-insight > .cs-insight__title,
  .cs-insight > .cs-insight__text {
    grid-column: 1;
  }

  /* Wireframes stack */
  .cs-wireframes {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* Reflection */
  .cs-reflection {
    padding: 24px;
  }

  /* Next project */
  .cs-next-project {
    padding: 40px 16px;
  }

  .cs-next-project__image {
    height: 180px;
  }

  .cs-next-project__name {
    font-size: 18px;
  }

  .cs-next-project__info {
    padding: 20px;
  }

  /* Screen captions */
  .cs-screen__caption {
    padding: 14px 16px;
  }

  /* Meta grid */
  .cs-meta {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  /* Exploration */
  .cs-exploration {
    grid-template-columns: 1fr;
  }

  /* A11y */
  .cs-a11y__grid {
    grid-template-columns: 1fr;
  }

  /* Interactions */
  .cs-interaction {
    padding: 16px;
  }
}

/* Extra small devices */
@media (max-width: 480px) {
  .cs-hero__title {
    font-size: clamp(28px, 8vw, 40px);
    letter-spacing: -0.5px;
  }

  .cs-section__title {
    font-size: clamp(22px, 5vw, 28px);
  }

  .cs-meta {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .cs-meta__value {
    font-size: 13px;
  }

  .cs-research__methods {
    grid-template-columns: 1fr;
  }

  .cs-impact__grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .cs-impact__card {
    padding: 20px 14px;
  }

  .cs-impact__metric {
    font-size: 22px;
  }

  .cs-empathy-map__quadrant {
    padding: 20px;
  }

  .cs-persona__header {
    padding: 16px;
    gap: 12px;
  }

  .cs-persona__body {
    padding: 16px;
  }

  .cs-problem__statement {
    font-size: 16px;
    padding: 20px;
  }

  .cs-flow__step {
    flex: 1 1 100%;
  }
}