/* ============================================================
   THE CREATIVITY LAB — Proof of Execution ("Execution leaves evidence")
   Case-study dossier: huge index + engineered-systems spec sheet + numbered tabs.
   ============================================================ */
.collab {
  position: relative;
  padding: clamp(56px, 7vw, 116px) clamp(20px, 4.5vw, 52px) clamp(64px, 8vw, 120px);
  border-top: 1px solid var(--border-subtle);
}
@media (min-width: 1800px) { .collab { max-width: 1760px; margin: 0 auto; } }

.cb-head { position: relative; padding-top: clamp(18px, 3.5vw, 48px); }
.cb-eyebrow { font-family: var(--font-label); font-size: 13px; font-weight: var(--fw-semibold); letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-secondary); }
.cb-eyebrow .idx { color: var(--text-faint); }
.cb-headline {
  font-family: var(--font-display); font-weight: var(--fw-bold);
  font-size: clamp(2.2rem, 5.5vw, 5rem); line-height: 0.98; letter-spacing: var(--tracking-tight);
  color: var(--text-primary); margin-top: clamp(22px, 3vw, 40px);
}
.cb-headline .ln { display: block; }
.cb-headline .muted { color: var(--text-muted); }
.cb-sub { margin-top: clamp(16px, 1.8vw, 22px); font-family: var(--font-label); font-size: clamp(12px, 1vw, 14px); letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-secondary); }

/* ---- Case-study stage ---- */
.cb-stage { margin-top: clamp(40px, 5vw, 76px); }
.cb-case { display: grid; grid-template-columns: 1fr; gap: clamp(16px, 2vw, 28px); }
@media (min-width: 880px) { .cb-case { grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.55fr); gap: clamp(36px, 5vw, 84px); align-items: start; } }

.cb-case__index { font-family: var(--font-display); font-weight: var(--fw-bold); line-height: 0.78;
  font-size: clamp(5.5rem, 17vw, 16rem); letter-spacing: -0.04em;
  color: transparent; -webkit-text-stroke: 1.5px rgba(255,255,255,0.14); }

.cb-case__main { min-width: 0; }
.cb-kicker { font-family: var(--font-label); font-size: 12px; font-weight: var(--fw-semibold); letter-spacing: 0.14em; text-transform: uppercase; color: var(--mg-orange); }
.cb-name { font-family: var(--font-display); font-weight: var(--fw-semibold); font-size: clamp(2rem, 3.4vw, 3.4rem); line-height: 1.02; letter-spacing: -0.02em; color: var(--text-primary); margin-top: 12px; }
.cb-outcome { margin-top: clamp(14px, 1.6vw, 20px); font-size: clamp(1.05rem, 1.3vw, 1.32rem); line-height: 1.45; letter-spacing: -0.01em; color: var(--text-secondary); max-width: 48ch; text-wrap: pretty; }

.cb-systems { margin-top: clamp(24px, 3vw, 40px); }
.cb-systems__label { font-family: var(--font-label); font-size: 11px; font-weight: var(--fw-semibold); letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-faint); padding-bottom: 12px; border-bottom: 1px solid var(--border-subtle); }
.cb-systems__list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr; }
@media (min-width: 620px) { .cb-systems__list { grid-template-columns: 1fr 1fr; column-gap: clamp(24px, 3vw, 52px); } }
.cb-system { display: flex; align-items: center; gap: 13px; padding: clamp(13px, 1.5vw, 17px) 0; border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-display); font-weight: var(--fw-medium); font-size: clamp(1rem, 1.15vw, 1.18rem); letter-spacing: -0.01em; color: var(--text-secondary);
  opacity: 0; animation: cbItem 0.6s var(--ease-out) forwards; animation-delay: calc(var(--i) * 0.08s + 0.1s); }
.cb-system__mark { flex: none; width: 6px; height: 6px; border-radius: 50%; background: var(--mg-orange); box-shadow: 0 0 8px rgba(255,90,44,0.55); }
@keyframes cbItem { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

.cb-controls { display: flex; align-items: center; justify-content: space-between; margin-top: clamp(28px, 3.2vw, 46px); }
.cb-count { font-family: var(--font-label); font-size: 13px; letter-spacing: 0.1em; color: var(--text-faint); }
.cb-count span { color: var(--text-primary); }
.cb-nav { display: flex; gap: 12px; }
.cb-arrow {
  width: 48px; height: 48px; display: inline-flex; align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--border-default); color: var(--text-secondary); cursor: pointer;
  transition: color var(--dur) var(--ease-out), border-color var(--dur) var(--ease-out), background var(--dur) var(--ease-out);
}
.cb-arrow:hover { color: var(--text-primary); border-color: var(--border-strong); background: var(--mg-ink-850); }
.cb-arrow svg { transition: transform var(--dur) var(--ease-out); }
.cb-arrow.prev:hover svg { transform: translateX(-3px); }
.cb-arrow.next:hover svg { transform: translateX(3px); }

/* ---- Numbered project tabs with premium active indicator ---- */
.cb-tabs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; margin-top: clamp(40px, 5vw, 72px); border-top: 1px solid var(--border-subtle); }
@media (min-width: 760px) { .cb-tabs { grid-template-columns: repeat(5, 1fr); } }
.cb-tab { position: relative; display: flex; flex-direction: column; gap: 7px; align-items: flex-start;
  padding: clamp(16px, 1.8vw, 22px) clamp(12px, 1.4vw, 18px) clamp(16px, 1.8vw, 22px) 0;
  background: none; border: none; border-bottom: 1px solid var(--border-subtle); cursor: pointer; text-align: left;
  transition: color 0.4s var(--ease-out); }
@media (min-width: 760px) { .cb-tab { border-bottom: none; } }
.cb-tab__bar { position: absolute; top: -1px; left: 0; right: 0; height: 2px; background: #ff5a1f; box-shadow: 0 0 10px rgba(255,90,44,0.6); transform: scaleX(0); transform-origin: left; transition: transform 0.6s cubic-bezier(0.22,1,0.36,1); }
.cb-tab__n { font-family: var(--font-label); font-size: 11px; font-weight: var(--fw-semibold); letter-spacing: 0.12em; color: var(--text-faint); transition: color 0.4s var(--ease-out); }
.cb-tab__name { font-family: var(--font-display); font-weight: var(--fw-semibold); font-size: clamp(0.9rem, 1.05vw, 1.08rem); letter-spacing: 0.02em; text-transform: uppercase; color: var(--text-faint); transition: color 0.4s var(--ease-out); }
.cb-tab:hover .cb-tab__name { color: var(--text-secondary); }
.cb-tab:focus-visible { outline: 2px solid rgba(255,90,44,0.6); outline-offset: 3px; }
.cb-tab.active .cb-tab__n { color: #ff5a1f; }
.cb-tab.active .cb-tab__name { color: var(--text-primary); }
.cb-tab.active .cb-tab__bar { transform: scaleX(1); }

@media (prefers-reduced-motion: reduce) {
  .cb-system { animation: none; opacity: 1; }
  .cb-tab__bar { transition: none; }
}