/* =========================
   CASE STUDY PAGE
   case-study.css
========================= */

.cs-page {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 8%;
}

/* HERO */
.cs-hero {
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 48px 0 40px;
  gap: 32px;
}

/* SECTION INNER */
.cs-section-inner { max-width: 100%; }

/* SECTIONS */
.cs-section {
  padding: 100px 0;
  border-bottom: 1px solid #1a1a22;
}

.cs-section-dark {
  background: #0f0f11;
  margin: 0 -8%;
  padding: 100px 8%;
}

.cs-section-label {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  font-weight: 600;
}

.cs-heading {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.cs-body {
  color: var(--text-sec);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
  max-width: 560px;
}

.cs-body-wide { max-width: 760px; }

/* CALLOUT */
.cs-callout {
  background: #1a1a22;
  border: 1px solid #2a2a2a;
  border-left: 3px solid var(--accent);
  border-radius: 16px;
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cs-callout-icon {
  width: 36px;
  height: 36px;
  background: var(--accent);
  color: #0f0f11;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.cs-callout-text {
  font-size: 1rem;
  font-style: italic;
  color: var(--text-main);
  line-height: 1.7;
}

.cs-btn-primary {
  background: var(--accent-2);
  color: #e2e0dd;
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: 0.25s;
  display: inline-block;
}

.cs-btn-primary:hover { opacity: 0.85; transform: translateY(-2px); }

.cs-btn-secondary {
  border: 2px solid var(--accent-2);
  color: var(--accent-2);
  padding: 12px 24px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: 0.25s;
  display: inline-block;
}

.cs-btn-secondary:hover { background: var(--accent-2); color: #e2e0dd; }

/* =========================
   APPROACH LAYOUT
========================= */
.cs-approach-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
  margin-top: 48px;
}

.cs-approach-image {
  min-height: 500px;
  position: sticky;
  top: 100px;
}

/* =========================
   APPROACH STEPS
========================= */
.cs-steps {
  margin-top: 48px;
  display: flex;
  flex-direction: column;
}

.cs-step {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 28px;
}

.cs-step-track {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cs-step-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent, #5DCAA5);
  border: 2px solid var(--accent, #5DCAA5);
  flex-shrink: 0;
  margin-top: 4px;
}

.cs-step-line {
  width: 2px;
  flex: 1;
  background: linear-gradient(to bottom, var(--accent, #5DCAA5), #2a2a2a);
  min-height: 40px;
  margin-top: 6px;
}

.cs-step--last .cs-step-dot {
  background: transparent;
  border-color: var(--accent, #5DCAA5);
}

.cs-step-content {
  padding-bottom: 48px;
}

.cs-step--last .cs-step-content {
  padding-bottom: 0;
}

.cs-step-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent, #5DCAA5);
  margin-bottom: 8px;
}

.cs-step-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.cs-step-body {
  font-size: 0.95rem;
  color: var(--text-sec);
  line-height: 1.75;
  max-width: 600px;
}

.cs-step-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.cs-step-stat {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-top: 20px;
  background: rgba(93,202,165,0.06);
  border: 1px solid rgba(93,202,165,0.2);
  border-radius: 12px;
  padding: 14px 20px;
  width: fit-content;
}

.cs-step-stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent, #5DCAA5);
  line-height: 1;
}

.cs-step-stat-label {
  font-size: 0.85rem;
  color: var(--text-sec);
}

/* =========================
   WORKING WITH CONSTRAINTS
========================= */
.cs-constraints {
  background: #0f0f11;
  margin: 0 -8%;
  padding: 100px 8%;
  border-top: 1px solid #1a1a22;
  border-bottom: 1px solid #1a1a22;
}

.cs-constraints-inner {
  max-width: 100%;
}

.cs-constraints-top {
  max-width: 720px;
  margin-bottom: 56px;
}

.cs-chain {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 48px;
  background: #0f0f11;
  border: 1px solid #2e2e38;
  border-radius: 16px;
  padding: 28px 32px;
}

.cs-chain-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 130px;
}

.cs-chain-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: rgba(93,202,165,0.1);
  color: var(--accent, #5DCAA5);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.cs-chain-icon--amber { background: rgba(240,180,60,0.1);  color: #f0b43c; }
.cs-chain-icon--red   { background: rgba(240,100,100,0.1); color: #f06464; }
.cs-chain-icon--blue  { background: rgba(133,183,235,0.1); color: #85B7EB; }

.cs-chain-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  text-align: center;
}

.cs-chain-stat {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: #85B7EB;
  background: rgba(133,183,235,0.1);
  border: 1px solid rgba(133,183,235,0.2);
  border-radius: 20px;
  padding: 3px 10px;
}

.cs-chain-arrow {
  font-size: 1.2rem;
  color: #2e2e38;
  flex-shrink: 0;
}

.cs-constraints-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.cs-constraints-body {
  margin-bottom: 0;
}

.cs-constraints-body p {
  font-size: 1rem;
  color: var(--text-sec);
  line-height: 1.8;
}

.cs-constraints-quote {
  border-left: 3px solid var(--accent, #5DCAA5);
  padding: 4px 0 4px 24px;
  margin: 0;
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-main);
  line-height: 1.7;
  max-width: 700px;
}

/* =========================
   KEY DESIGN DECISIONS
========================= */
.cs-kd-block {
  padding: 48px 0;
  border-top: 1px solid #2e2e38;
}

.cs-kd-block:last-child {
  border-bottom: 1px solid #2e2e38;
}

.cs-kd-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 28px;
}

.cs-kd-num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent, #5DCAA5);
  flex-shrink: 0;
}

.cs-kd-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
}

.cs-kd-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.cs-kd-text .cs-body {
  max-width: 100%;
}

.cs-kd-quote {
  margin-top: 20px;
  border-left: 3px solid var(--accent, #5DCAA5);
  padding-left: 16px;
}

.cs-kd-quote p {
  font-style: italic;
  color: var(--text-main);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 6px;
}

.cs-kd-quote span {
  font-size: 0.78rem;
  color: var(--text-sec);
}

.cs-kd-visual {
  width: 100%;
}

.cs-kd-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
}

/* Role table � Decision 2 */
.cs-kd-role-table {
  border: 1px solid #2e2e38;
  border-radius: 14px;
  overflow: hidden;
}

.cs-kd-role-header {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1.6fr;
  padding: 12px 16px;
  background: #1a1a22;
  border-bottom: 1px solid #2e2e38;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-sec);
  gap: 12px;
}

.cs-kd-role-row {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1.6fr;
  padding: 14px 16px;
  border-bottom: 1px solid #1a1a22;
  font-size: 0.88rem;
  color: var(--text-sec);
  align-items: center;
  gap: 12px;
}

.cs-kd-role-row:last-child { border-bottom: none; }

/* Layers � Decision 3 */
.cs-kd-layers {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 32px;
}

.cs-kd-layer {
  border: 1px solid #2a2a2a;
  border-radius: 14px;
  padding: 24px 28px;
}

.cs-kd-layer--primary {
  border-color: var(--accent, #5DCAA5);
  background: rgba(93,202,165,0.04);
}

.cs-kd-layer--secondary {
  background: #0f0f11;
}

.cs-kd-layer-arrow {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-sec);
  letter-spacing: 0.06em;
  padding: 10px 0;
}

.cs-kd-layer-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent, #5DCAA5);
  margin-bottom: 6px;
}

.cs-kd-layer-desc {
  font-size: 0.85rem;
  color: var(--text-sec);
  margin-bottom: 18px;
}

.cs-kd-layer-panels {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.cs-kd-panel {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #1a1a22;
  border: 1px solid #2a2a2a;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 0.85rem;
  color: var(--text-main);
  flex: 1;
  min-width: 140px;
}

.cs-kd-panel-icon {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(93,202,165,0.1);
  color: var(--accent, #5DCAA5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.cs-kd-panel-icon--red { background: rgba(240,100,100,0.1); color: #f06464; }
.cs-kd-panel-icon--amber { background: rgba(240,180,60,0.1); color: #f0b43c; }

/* Onboarding � Decision 4 */
.cs-kd-onboarding {
  display: flex;
  align-items: center;
  gap: 20px;
}

.cs-kd-ob-before,
.cs-kd-ob-after {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cs-kd-ob-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 4px;
}

.cs-kd-ob-label--before { color: #f06464; }
.cs-kd-ob-label--after  { color: var(--accent, #5DCAA5); }

.cs-kd-ob-steps {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cs-kd-ob-step {
  padding: 8px 14px;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
  font-size: 0.82rem;
  color: var(--text-sec);
  background: #0f0f11;
}

.cs-kd-ob-step--new {
  border-color: rgba(93,202,165,0.3);
  color: var(--text-main);
  background: rgba(93,202,165,0.04);
}

.cs-kd-ob-arrow {
  font-size: 1.4rem;
  color: var(--text-sec);
  flex-shrink: 0;
}

.cs-kd-ob-count {
  font-size: 0.82rem;
  color: var(--text-sec);
  margin-top: 4px;
}

.cs-kd-ob-count--after {
  color: var(--accent, #5DCAA5);
  font-weight: 600;
}

/* =========================
   CHALLENGE CARDS
========================= */
.cs-challenge-cards {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 40px;
  margin-bottom: 32px;
}

.cs-challenge-card {
  display: grid;
  grid-template-columns: 1fr 32%;
  gap: 48px;
  padding: 36px 0;
  border-top: 1px solid #2e2e38;
  align-items: center;
}

.cs-challenge-card:last-child {
  border-bottom: 1px solid #2e2e38;
}

.cs-challenge-card--reverse {
  direction: rtl;
}

.cs-challenge-card--reverse .cs-challenge-body,
.cs-challenge-card--reverse .cs-challenge-image {
  direction: ltr;
}

.cs-challenge-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.cs-challenge-num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--accent, #5DCAA5);
  flex-shrink: 0;
}

.cs-challenge-text {
  font-size: 0.95rem;
  color: var(--text-sec);
  line-height: 1.75;
  margin: 0;
}

.cs-role-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.cs-role-badge {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid #2e2e38;
  color: var(--text-sec);
  background: #1a1a22;
}

.cs-role-badge--highlight {
  border-color: var(--accent, #5DCAA5);
  color: var(--accent, #5DCAA5);
  background: rgba(93,202,165,0.06);
}

.cs-challenge-image {
  width: 100%;
  border-radius: 12px;
  aspect-ratio: 16/9;
}

.cs-challenge-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 12px;
}

.cs-callout-summary {
  flex-direction: row;
  align-items: center;
  gap: 20px;
  padding: 24px 28px;
}

/* =========================
   REFLECTION
========================= */
.cs-reflection-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: start;
  margin-top: 40px;
  margin-bottom: 48px;
}

.cs-reflection-text .cs-body {
  max-width: 100%;
}

.cs-reflection-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cs-reflection-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: #1a1a22;
  border: 1px solid #2a2a2a;
  border-radius: 14px;
  padding: 20px;
}

.cs-reflection-card-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(93,202,165,0.08);
  color: var(--accent, #5DCAA5);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.cs-reflection-card-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.cs-reflection-card-body {
  font-size: 0.85rem;
  color: var(--text-sec);
  line-height: 1.7;
}

.cs-reflection-lesson {
  display: flex;
  align-items: baseline;
  gap: 20px;
  border-top: 1px solid #2a2a2a;
  padding-top: 32px;
}

.cs-reflection-lesson-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent, #5DCAA5);
  flex-shrink: 0;
}

.cs-reflection-lesson p {
  font-size: 1rem;
  color: var(--text-sec);
  line-height: 1.75;
}

@media (max-width: 900px) {
  .cs-reflection-layout { grid-template-columns: 1fr; gap: 32px; }
}

/* =========================
   FINAL DESIGN
========================= */
.cs-final-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px 48px;
  margin-top: 40px;
}

.cs-final-item {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cs-final-image {
  width: 100%;
}

.cs-final-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.cs-final-desc {
  font-size: 0.82rem;
  color: var(--text-sec);
  line-height: 1.7;
}

@media (max-width: 600px) {
  .cs-final-grid { grid-template-columns: 1fr; }
}

/* =========================
   CONFIDENTIALITY NOTE
========================= */
.cs-confidential {
  font-size: 0.95rem;
  color: var(--text-sec);
  border-left: 3px solid #444;
  padding-left: 14px;
  margin-top: 16px;
  margin-bottom: 32px;
}

/* =========================
   TAGS
========================= */
.cs-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 32px 0 48px;
}

.cs-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-sec);
  border: 1px solid #2e2e38;
  border-radius: 20px;
  padding: 5px 14px;
  letter-spacing: 0.02em;
}

/* =========================
   RESPONSIVE
   (placed at end of file so these overrides win the cascade
    over the base component rules declared above)
========================= */
@media (max-width: 900px) {
  .cs-page { padding: 0 5%; }
  .cs-hero { min-height: unset; padding: 32px 0 24px; }
  .cs-challenge-card { grid-template-columns: 1fr; }
  .cs-challenge-image { display: none; }
  .cs-approach-layout { grid-template-columns: 1fr; }
  .cs-approach-image { position: static; top: auto; min-height: 0; }
  .cs-constraints-two-col { grid-template-columns: 1fr; gap: 32px; }
  .cs-kd-layout { grid-template-columns: 1fr; gap: 32px; }
  .cs-chain { flex-direction: column; }
  .cs-section-dark { margin: 0 -5%; padding: 80px 5%; }
  /* full-bleed sections must match the reduced 5% page padding */
  .cs-constraints { margin: 0 -5%; padding: 80px 5%; }
}

@media (max-width: 480px) {
  .cs-btn-primary, .cs-btn-secondary { text-align: center; width: 100%; }
}