/* =========================================
   CASE STUDY PREMIUM STYLES
   Shared across project1detail, project2detail, project3detail
   ========================================= */

/* --- Case Study Sticky Sub-Navigation --- */
.cs-subnav {
  position: sticky;
  top: var(--nav-height);
  z-index: 900;
  background: rgba(253, 251, 247, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.cs-subnav__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cs-subnav__list {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding: 12px 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}

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

.cs-subnav__link {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-3);
  white-space: nowrap;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.cs-subnav__link:hover {
  color: var(--color-text);
  background: var(--color-surface);
}

.cs-subnav__link.is-active {
  color: var(--color-accent);
  background: var(--color-accent-light);
  font-weight: var(--fw-semibold);
}

@media (max-width: 768px) {
  .cs-subnav__list {
    padding: 10px 0;
    gap: 4px;
  }
  .cs-subnav__link {
    padding: 5px 12px;
    font-size: 11px;
  }
}

/* --- Case Study Hero --- */
.cs-hero {
  min-height: 90vh;
  display: flex;
  align-items: flex-end;
  position: relative;
  overflow: hidden;
  padding-top: calc(var(--nav-height) + 40px);
  padding-bottom: var(--spacing-3xl);
  background: var(--color-text);
}

.cs-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 60% 30%, rgba(200,90,50,0.18) 0%, transparent 70%);
  pointer-events: none;
}

.cs-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 100%);
}

.cs-hero__content {
  position: relative;
  z-index: 2;
  max-width: 960px;
}

.cs-hero__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(200,90,50,0.2);
  color: #e87d5a;
  border: 1px solid rgba(200,90,50,0.3);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
}

.cs-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 6vw, 80px);
  font-weight: var(--fw-regular);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: #fff;
  margin-bottom: var(--spacing-md);
}

.cs-hero__subtitle {
  font-size: clamp(15px, 1.8vw, 19px);
  color: rgba(255,255,255,0.6);
  max-width: 680px;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
}

.cs-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cs-hero__pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-full);
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  font-weight: var(--fw-medium);
  backdrop-filter: blur(8px);
}

.cs-hero__pill strong {
  color: #fff;
}

/* --- Impact Numbers --- */
.cs-impact {
  padding: var(--spacing-xl) 0;
  background: var(--color-text);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.cs-impact__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.cs-impact__item {
  background: var(--color-text);
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
}

.cs-impact__num {
  font-family: var(--font-serif);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: var(--fw-regular);
  color: #fff;
  line-height: 1;
  margin-bottom: 6px;
}

.cs-impact__num span {
  color: var(--color-accent);
}

.cs-impact__label {
  font-size: 12px;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* --- Snapshot Grid --- */
.cs-snapshot {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--color-border);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: var(--spacing-xl);
}

.cs-snapshot__cell {
  background: var(--color-bg);
  padding: 24px 20px;
}

.cs-snapshot__key {
  font-size: 10px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: 8px;
}

.cs-snapshot__val {
  font-size: 15px;
  font-weight: var(--fw-medium);
  color: var(--color-text);
  line-height: 1.4;
}

.cs-snapshot__val--accent {
  color: var(--color-accent);
  font-weight: var(--fw-semibold);
}

/* --- Problem Callout --- */
.cs-problem {
  background: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--spacing-lg) var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.cs-problem::before {
  content: '"';
  position: absolute;
  top: -20px;
  left: 16px;
  font-size: 160px;
  font-family: var(--font-serif);
  color: var(--color-accent);
  opacity: 0.08;
  line-height: 1;
  pointer-events: none;
}

.cs-problem__text {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.5vw, 26px);
  line-height: 1.5;
  color: var(--color-text);
  font-style: italic;
  position: relative;
  z-index: 1;
}

/* --- Section Divider --- */
.cs-divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-xl) 0;
}

.cs-divider__line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.cs-divider__label {
  font-size: 11px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-3);
  white-space: nowrap;
}

/* --- Insight Cards --- */
.cs-insights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-md);
}

.cs-insight {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  position: relative;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  overflow: hidden;
}

.cs-insight::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.cs-insight:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.cs-insight:hover::after {
  opacity: 1;
}

.cs-insight__num {
  font-size: 11px;
  font-weight: var(--fw-bold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
}

.cs-insight__title {
  font-size: 17px;
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.4;
}

.cs-insight__obs {
  font-size: 14px;
  color: var(--color-text-2);
  line-height: 1.6;
  margin-bottom: 12px;
}

.cs-insight__opp {
  font-size: 13px;
  color: var(--color-accent);
  font-weight: var(--fw-medium);
  padding: 8px 12px;
  background: var(--color-accent-light);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

/* --- Process Steps --- */
.cs-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: step-counter;
}

.cs-step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.cs-step:last-child {
  border-bottom: none;
}

.cs-step__num {
  font-family: var(--font-serif);
  font-size: clamp(48px, 5vw, 64px);
  color: var(--color-border);
  line-height: 1;
  font-weight: var(--fw-regular);
  padding-top: 4px;
  transition: color var(--transition-base);
}

.cs-step:hover .cs-step__num {
  color: var(--color-accent);
}

.cs-step__body {
  display: flex;
  flex-direction: column;
}

.cs-step__tag {
  font-size: 11px;
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: 6px;
}

.cs-step__title {
  font-size: clamp(18px, 2vw, 24px);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-bottom: 10px;
  line-height: 1.3;
}

.cs-step__body p {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.7;
}

/* --- Before / After --- */
.cs-ba {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.cs-ba__col {
  padding: var(--spacing-lg);
}

.cs-ba__col--before {
  background: var(--color-surface);
}

.cs-ba__col--after {
  background: var(--color-text);
}

.cs-ba__head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--spacing-md);
}

.cs-ba__head svg { flex-shrink: 0; }

.cs-ba__col--before .cs-ba__head { color: var(--color-text-3); }
.cs-ba__col--after .cs-ba__head { color: rgba(255,255,255,0.5); }

.cs-ba__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cs-ba__item {
  font-size: 14px;
  line-height: 1.5;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}

.cs-ba__col--before .cs-ba__item {
  background: var(--color-surface-2);
  color: var(--color-text-2);
  text-decoration: line-through;
  text-decoration-color: rgba(0,0,0,0.2);
}

.cs-ba__col--after .cs-ba__item {
  background: rgba(255,255,255,0.07);
  color: rgba(255,255,255,0.85);
  font-weight: var(--fw-medium);
}

.cs-ba__col--after .cs-ba__item::before {
  content: '✓ ';
  color: var(--color-accent);
  font-weight: var(--fw-bold);
}

/* --- Outcome Cards --- */
.cs-outcomes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--spacing-md);
}

.cs-outcome {
  padding: var(--spacing-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.cs-outcome:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.cs-outcome__icon {
  width: 40px;
  height: 40px;
  background: var(--color-accent-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent);
}

.cs-outcome__text {
  font-size: 15px;
  font-weight: var(--fw-medium);
  color: var(--color-text);
  line-height: 1.4;
}

/* --- Learnings --- */
.cs-learnings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-md);
}

.cs-learning {
  border-top: 2px solid var(--color-border);
  padding-top: var(--spacing-md);
  transition: border-color var(--transition-fast);
}

.cs-learning:hover {
  border-top-color: var(--color-accent);
}

.cs-learning__num {
  font-family: var(--font-serif);
  font-size: 40px;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: 8px;
  transition: color var(--transition-fast);
}

.cs-learning:hover .cs-learning__num {
  color: var(--color-accent);
}

.cs-learning__text {
  font-size: 15px;
  color: var(--color-text-2);
  line-height: 1.6;
}

/* --- Flow Diagram (horizontal steps) --- */
.cs-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  flex-wrap: wrap;
}

.cs-flow__step {
  flex: 1;
  min-width: 140px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-right: none;
  padding: var(--spacing-md);
  position: relative;
  transition: background var(--transition-fast);
}

.cs-flow__step:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
.cs-flow__step:last-child { border-right: 1px solid var(--color-border); border-radius: 0 var(--radius-md) var(--radius-md) 0; }

.cs-flow__step:hover { background: var(--color-surface-2); }

.cs-flow__num {
  font-size: 11px;
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.cs-flow__title {
  font-size: 15px;
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-bottom: 6px;
}

.cs-flow__desc {
  font-size: 12px;
  color: var(--color-text-3);
  line-height: 1.5;
}

/* --- Back Button --- */
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: var(--fw-medium);
  color: var(--color-text-3);
  padding: 8px 0;
  transition: color var(--transition-fast), gap var(--transition-fast);
  border: none;
  background: none;
  cursor: pointer;
  text-decoration: none;
}

.cs-back:hover {
  color: var(--color-text);
  gap: 12px;
}

/* --- Colour System Table --- */
.cs-color-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.cs-color-table th {
  text-align: left;
  padding: 10px 16px;
  font-size: 11px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-3);
  border-bottom: 1px solid var(--color-border);
}

.cs-color-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-2);
  vertical-align: middle;
}

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

.cs-color-swatch {
  display: inline-block;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  vertical-align: middle;
  margin-right: 8px;
  border: 1px solid rgba(0,0,0,0.08);
}

/* --- Persona Card --- */
.cs-persona {
  background: var(--color-text);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-lg);
  align-items: start;
  overflow: hidden;
  position: relative;
}

.cs-persona::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 240px; height: 240px;
  background: radial-gradient(circle, rgba(200,90,50,0.2) 0%, transparent 70%);
  pointer-events: none;
}

.cs-persona__avatar {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-full);
  background: rgba(200,90,50,0.25);
  border: 2px solid rgba(200,90,50,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #e87d5a;
}

.cs-persona__name {
  font-size: 22px;
  font-weight: var(--fw-bold);
  color: #fff;
  margin-bottom: 4px;
}

.cs-persona__role {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.cs-persona__cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.cs-persona__col-label {
  font-size: 11px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 10px;
}

.cs-persona__col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cs-persona__col li {
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  line-height: 1.5;
  padding-left: 12px;
  position: relative;
}

.cs-persona__col li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 7px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* --- Error Cards --- */
.cs-errors {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.cs-error {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-sm);
  align-items: center;
  padding: var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
}

.cs-error__before {
  color: var(--color-text-3);
  font-family: monospace;
  background: var(--color-surface-2);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px;
}

.cs-error__arrow {
  color: var(--color-accent);
  font-weight: var(--fw-bold);
  font-size: 18px;
  text-align: center;
}

.cs-error__after {
  color: var(--color-text);
  font-weight: var(--fw-medium);
  font-size: 13px;
  line-height: 1.45;
}

.cs-error__label {
  font-size: 10px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-3);
  margin-bottom: 4px;
}

/* --- Role Chips --- */
.cs-role-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: var(--spacing-sm);
}

.cs-role-chip {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: var(--fw-medium);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-2);
}

/* --- Portfolio Statement --- */
.cs-statement {
  background: var(--color-accent);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  position: relative;
  overflow: hidden;
}

.cs-statement::before {
  content: '';
  position: absolute;
  top: -80px; right: -80px;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(255,255,255,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cs-statement__label {
  font-size: 11px;
  font-weight: var(--fw-bold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  margin-bottom: var(--spacing-sm);
}

.cs-statement__text {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.5vw, 26px);
  color: #fff;
  line-height: 1.5;
  margin-bottom: var(--spacing-md);
}

.cs-statement__visuals {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: var(--spacing-md);
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: var(--spacing-md);
}

.cs-statement__visual-item {
  font-size: 13px;
  color: rgba(255,255,255,0.8);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.cs-statement__visual-item::before {
  content: '→';
  color: rgba(255,255,255,0.4);
  flex-shrink: 0;
}

/* --- Utility: NDA badge --- */
.cs-nda {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(0,0,0,0.06);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.08em;
  color: var(--color-text-3);
}

/* --- Responsive overrides --- */

/* --- Read More Component & Responsive Grids --- */
.mobile-read-more .read-more-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.5s ease-out, opacity 0.5s ease-out, margin-top 0.5s ease-out;
  visibility: hidden;
}
.mobile-read-more.expanded .read-more-content,
.mobile-read-more.is-expanded .read-more-content,
.mobile-read-more .read-more-content.is-visible,
.mobile-read-more .read-more-content.expanded {
  max-height: 5000px;
  opacity: 1;
  visibility: visible;
  margin-top: var(--spacing-md);
  overflow: visible;
}
.read-more-btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  margin-top: var(--spacing-md);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
}
.read-more-btn:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

.cs-grid-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

/* --- Extra Small Mobile --- */

@media (max-width: 374px) {
  .cs-ba { grid-template-columns: 1fr; }
  .cs-hero { min-height: auto; padding-top: calc(var(--nav-height) + 24px); padding-bottom: var(--spacing-2xl); }
  .cs-step { grid-template-columns: 56px 1fr; gap: var(--spacing-md); }
  .cs-step__num { font-size: 40px; }
  .cs-persona { grid-template-columns: 1fr; }
  .cs-persona__cols { grid-template-columns: 1fr; }
  .cs-flow { flex-direction: column; }
  .cs-flow__step { border-right: 1px solid var(--color-border); border-bottom: none; border-radius: 0; }
  .cs-flow__step:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
  .cs-flow__step:last-child { border-radius: 0 0 var(--radius-md) var(--radius-md); border-bottom: 1px solid var(--color-border); }
  .cs-error { grid-template-columns: 1fr; }
  .cs-error__arrow { transform: rotate(90deg); text-align: left; }
  .cs-hero__title { font-size: 32px; }
  .cs-snapshot { grid-template-columns: 1fr 1fr; }
  .cs-impact__grid { grid-template-columns: 1fr 1fr; }
  .cs-grid-split {
    grid-template-columns: 1fr;
  }
}

/* --- Mobile --- */

@media (min-width: 375px) and (max-width: 767px) {
  .cs-ba { grid-template-columns: 1fr; }
  .cs-hero { min-height: auto; padding-top: calc(var(--nav-height) + 24px); padding-bottom: var(--spacing-2xl); }
  .cs-step { grid-template-columns: 56px 1fr; gap: var(--spacing-md); }
  .cs-step__num { font-size: 40px; }
  .cs-persona { grid-template-columns: 1fr; }
  .cs-persona__cols { grid-template-columns: 1fr; }
  .cs-flow { flex-direction: column; }
  .cs-flow__step { border-right: 1px solid var(--color-border); border-bottom: none; border-radius: 0; }
  .cs-flow__step:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
  .cs-flow__step:last-child { border-radius: 0 0 var(--radius-md) var(--radius-md); border-bottom: 1px solid var(--color-border); }
  .cs-error { grid-template-columns: 1fr; }
  .cs-error__arrow { transform: rotate(90deg); text-align: left; }
  .cs-hero__title { font-size: 32px; }
  .cs-snapshot { grid-template-columns: 1fr 1fr; }
  .cs-impact__grid { grid-template-columns: 1fr 1fr; }
  .cs-grid-split {
    grid-template-columns: 1fr;
  }
}

/* --- Tablet --- */

@media (min-width: 768px) and (max-width: 1023px) {
  .cs-ba { grid-template-columns: 1fr; }
  .cs-hero { min-height: auto; padding-top: calc(var(--nav-height) + 24px); padding-bottom: var(--spacing-2xl); }
  .cs-step { grid-template-columns: 56px 1fr; gap: var(--spacing-md); }
  .cs-step__num { font-size: 40px; }
  .cs-persona { grid-template-columns: 1fr; }
  .cs-persona__cols { grid-template-columns: 1fr; }
  .cs-flow { flex-direction: column; }
  .cs-flow__step { border-right: 1px solid var(--color-border); border-bottom: none; border-radius: 0; }
  .cs-flow__step:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
  .cs-flow__step:last-child { border-radius: 0 0 var(--radius-md) var(--radius-md); border-bottom: 1px solid var(--color-border); }
  .cs-error { grid-template-columns: 1fr; }
  .cs-error__arrow { transform: rotate(90deg); text-align: left; }
  .cs-grid-split {
    grid-template-columns: 1fr;
  }
  .mobile-read-more .read-more-content {
    max-height: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    margin-top: var(--spacing-sm) !important;
  }
  .mobile-read-more .read-more-btn {
    display: none !important;
  }
}

/* --- Laptop --- */

@media (min-width: 1024px) and (max-width: 1279px) {
  .mobile-read-more .read-more-content {
    max-height: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    margin-top: var(--spacing-sm) !important;
  }
  .mobile-read-more .read-more-btn {
    display: none !important;
  }
}

/* --- Desktop --- */

@media (min-width: 1280px) and (max-width: 1535px) {
  .mobile-read-more .read-more-content {
    max-height: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    margin-top: var(--spacing-sm) !important;
  }
  .mobile-read-more .read-more-btn {
    display: none !important;
  }
}

/* --- Large Desktop --- */

@media (min-width: 1536px) {
  .mobile-read-more .read-more-content {
    max-height: none !important;
    opacity: 1 !important;
    visibility: visible !important;
    margin-top: var(--spacing-sm) !important;
  }
  .mobile-read-more .read-more-btn {
    display: none !important;
  }
}