/* ==========================================================================
   Verb Kingdom — Case Study stylesheet
   PROVE layer: richer editorial layout for an e-learning case study.
   All colours & type come from global.css custom properties.
   ========================================================================== */

/* ---------- Header alignment (match main-site container spacing) ---------- */
.site-nav {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: 32px;
  padding-right: 32px;
}
@media (max-width: 980px) {
  .site-nav { padding-left: 22px; padding-right: 22px; }
}
@media (max-width: 560px) {
  .site-nav { padding-left: 18px; padding-right: 18px; }
}

/* ---------- Case body ---------- */
.case {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 32px 80px;
}

.case-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  margin: 24px 0 8px;
  transition: opacity 0.2s;
}
.case-back:hover {
  opacity: 0.7;
}

/* ---------- Hero ---------- */
.case-hero {
  padding: 48px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.case-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.case-number {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 1px;
}

.case-category {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted2);
  letter-spacing: 1px;
  text-transform: uppercase;
}

.case-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 7vw, 64px);
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 16px;
}

.case-tagline {
  font-size: 19px;
  line-height: 1.5;
  color: var(--muted);
  max-width: 640px;
  margin-bottom: 24px;
}

.case-hero-img {
  margin: 24px 0 8px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.case-hero-img img {
  width: 100%;
  display: block;
}

.case-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 24px;
}

/* ---------- Sections ---------- */
.case-section {
  padding: 44px 0 8px;
}

.case-section + .case-section {
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

.case-section-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}

.case-section h2 {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: var(--text);
  margin-bottom: 12px;
}

.case-section-lead {
  font-size: 16px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 720px;
  margin-bottom: 20px;
}

.case-section p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 720px;
}

/* ---------- Two-up cards (Design + Development) ---------- */
.case-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px;
}

.case-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.case-card p {
  max-width: none;
}

/* ---------- Snapshot / overview grid ---------- */
.case-snapshot {
  margin: 20px 0;
}

.snap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.snap-item {
  background: var(--surface);
  padding: 18px 20px;
}

.snap-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted2);
  margin-bottom: 6px;
}

.snap-value {
  font-size: 15px;
  line-height: 1.45;
  color: var(--text);
  font-weight: 500;
}

.snap-value.small {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
  font-weight: 400;
}

/* ---------- Two-column split (text + media) ---------- */
.case-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin: 24px 0;
}

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

.split-text p {
  max-width: none;
}

.split-media {
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.split-media img {
  width: 100%;
  display: block;
}

/* ---------- Flow / timeline ---------- */
.case-flow {
  display: flex;
  align-items: stretch;
  gap: 10px;
  margin: 24px 0;
}

.flow-step {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 16px;
  text-align: center;
}

.flow-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent2);
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.flow-step h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.flow-step p {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  max-width: none;
}

.flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 18px;
}

/* ---------- Experience modules ---------- */
.exp-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 24px 0;
}

.exp-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.exp-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.exp-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--tag-bg2);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
}

.exp-card h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.exp-body {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.exp-example {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent2);
}

/* ---------- Image gallery ---------- */
.case-gallery {
  margin: 24px 0;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.gallery-grid.three {
  grid-template-columns: repeat(3, 1fr);
}

.gallery-item {
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.gallery-item img {
  width: 100%;
  display: block;
}

.gallery-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted2);
  padding: 10px 12px;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.gallery-scroll {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 8px;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.gallery-scroll .gallery-item {
  flex: 0 0 320px;
}

.gallery-scroll::-webkit-scrollbar {
  height: 6px;
}
.gallery-scroll::-webkit-scrollbar-thumb {
  background: var(--accent2);
  border-radius: 10px;
}

/* ---------- Value / capability list ---------- */
.value-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 24px 0;
}

.value-item {
  display: flex;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
}

.value-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--tag-bg2);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
}

.value-text h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.value-text p {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  max-width: none;
}

/* ---------- Callout / pull quote ---------- */
.case-callout {
  background: var(--surface-warm);
  border-left: 3px solid var(--accent2);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 22px 24px;
  margin: 24px 0;
}

.case-callout p {
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.5;
  color: var(--text);
  max-width: none;
  margin: 0;
}

.case-callout cite {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted2);
  font-style: normal;
  letter-spacing: 0.5px;
}

/* ---------- Final CTA ---------- */
.case-final {
  text-align: center;
  padding: 48px 0 16px;
}

.case-final h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 34px);
  color: var(--text);
  margin-bottom: 10px;
}

.case-final > p {
  color: var(--muted);
  margin: 0 auto 24px;
  max-width: 560px;
}

.case-final-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}

/* ---------- IP note ---------- */
.ip-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted2);
  text-align: center;
  max-width: 520px;
  margin: 10px auto 0;
  line-height: 1.6;
}

/* ---------- Tags / deliverables ---------- */
.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}

.case-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--tag-bg);
  color: var(--text);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
}

.case-deliverables {
  list-style: none;
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.case-deliverables li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.55;
}

.case-deliverables li::before {
  content: '→';
  font-family: var(--font-mono);
  color: var(--accent);
  flex-shrink: 0;
}

.case-note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted2);
  background: var(--surface-warm);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin: 16px 0;
}

/* ---------- Problem cards (3-up: struggle / why worksheets fail / why interaction works) ---------- */
.prob-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 20px 0;
}
.prob-card {
  background: var(--surface-warm);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
}
.prob-card h4 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.prob-card p {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  max-width: none;
  margin: 0;
}

/* ---------- Driver metaphor visual ---------- */
.driver-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 24px 0;
}
.driver-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px;
}
.driver-panel.ok { border-top: 3px solid var(--accent); }
.driver-panel.bad { border-top: 3px solid var(--accent2); }
.driver-panel h4 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 10px;
}
.driver-sentence {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background: var(--surface-warm);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 10px;
}
.driver-sentence .hl {
  color: #E83030;
  font-weight: 600;
}
.driver-sentence .okword {
  color: var(--accent);
  font-weight: 600;
}
.driver-panel p {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  max-width: none;
  margin: 0;
}

/* ---------- Reconstructed module screens (Inside the Experience) ---------- */
.vk-screens {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 24px 0;
}
.vk-screen {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.vk-screen-bar {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 12px;
  background: var(--surface-warm);
  border-bottom: 1px solid var(--border);
}
.vk-screen-bar .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent2);
  opacity: 0.55;
}
.vk-screen-bar span.label {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted2);
}
.vk-screen-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.vk-screen-kicker {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
}
.vk-screen-title {
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.25;
  color: var(--text);
}
.vk-screen-text {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}
.vk-screen-example {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text);
  background: var(--surface-warm);
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}
.vk-screen-example .hl { color: #E83030; font-weight: 600; }

/* ---------- 6-step independent build chain ---------- */
.chain-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0;
}
.chain-step {
  flex: 1 1 150px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 12px;
  text-align: center;
}
.chain-num {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent2);
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.chain-step h4 {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 5px;
}
.chain-step p {
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
  max-width: none;
  margin: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .case {
    padding: 16px 20px 64px;
  }
  .case-split {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  .case-split.reverse {
    direction: ltr;
  }
  .snap-grid {
    grid-template-columns: 1fr;
  }
  .case-flow {
    flex-direction: column;
  }
  .flow-arrow {
    transform: rotate(90deg);
    padding: 4px 0;
  }
  .exp-grid,
  .gallery-grid,
  .gallery-grid.three,
  .value-list,
  .case-grid,
  .prob-grid,
  .driver-visual,
  .vk-screens {
    grid-template-columns: 1fr;
  }
  .chain-step {
    flex: 1 1 130px;
  }
  .gallery-scroll .gallery-item {
    flex: 0 0 260px;
  }
  .case-final-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .case-final-actions .btn {
    justify-content: center;
  }
}