/* ═══════════════════════════════════════════════════════════════════════
   CASE STUDY SIDE NAV — sticky reading progress nav
   position: fixed left; collapsed by default; expands on hover
   Uses existing design tokens from main.css / .akp-root
   ═══════════════════════════════════════════════════════════════════════ */

.csp-sidenav {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;                       /* below sticky nav (z:100) */
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 16px 25px 16px 1px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

/* Visible once user scrolls past the page header */
.csp-sidenav.is-ready {
  opacity: 1;
  pointer-events: auto;
  background: var(--bg);
  border-right: 1px solid var(--hairline);
  border-radius: 0 8px 8px 0;
  padding: 16px 16px 16px 1px;
}

/* ── Each nav item ── */
.csp-sidenav-item {
  display: flex;
  align-items: center;
  gap: 0;
  cursor: pointer;
  padding: 8px 0 8px 0;
  position: relative;
  text-decoration: none;
}

/* ── Left accent rail ── */
.csp-sidenav-item::before {
  content: '';
  display: block;
  width: 3px;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  background: transparent;
  border-radius: 0 2px 2px 0;
  transition: background 0.2s ease;
  flex-shrink: 0;
}
.csp-sidenav-item.is-active::before {
  background: var(--accent);
}

/* ── Number pill ── */
.csp-sidenav-num {
  font-family: var(--mono);
  font-size: var(--text-9);
  font-weight: 600;
  letter-spacing: 0.07em;
  color: var(--ink-3);
  text-transform: uppercase;
  line-height: 1;
  width: 44px;
  text-align: center;
  flex-shrink: 0;
  transition: color 0.2s ease;
}
.csp-sidenav-item.is-active .csp-sidenav-num {
  color: var(--accent);
}
.csp-sidenav-item:hover .csp-sidenav-num {
  color: var(--ink);
  
}

/* ── Label ── */
.csp-sidenav-label {
  font-family: var(--sans);
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: transparent;                /* hidden until expanded */
  white-space: nowrap;
  max-width: 0;
  overflow: hidden;
  transition: color 0.18s ease, max-width 0.28s cubic-bezier(0.4,0,0.2,1);
  line-height: 1.35;
}
/* Expand on sidenav hover */
.csp-sidenav:hover .csp-sidenav-label {
  color: var(--ink-2);
  max-width: 180px;
}
.csp-sidenav:hover .csp-sidenav-item.is-active .csp-sidenav-label {
  color: var(--accent-strong);
  font-weight: 600;
}
.csp-sidenav:hover .csp-sidenav-item:hover .csp-sidenav-label {
  color: var(--ink);
}

/* ── Dot indicator (compact state) ── */
.csp-sidenav-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--hairline-strong);
  flex-shrink: 0;
  margin-left: auto;
  margin-right: 8px;
  transition: background 0.2s ease, transform 0.2s ease;
  /* hidden when expanded */
}
.csp-sidenav:hover .csp-sidenav-dot {
  opacity: 0;
  max-width: 0;
  margin: 0;
}
.csp-sidenav-item.is-active .csp-sidenav-dot {
  background: var(--accent);
  transform: scale(1.4);
}

/* ── Background on hover of the whole nav ── */
.csp-sidenav::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--bg);
  border-right: 1px solid var(--hairline);
  border-radius: 0 8px 8px 0;
  opacity: 0;
  transition: opacity 0.22s ease;
  z-index: -1;
  box-shadow: 0 0 5px 5px rgba(12,26,39,0.1);
}
.csp-sidenav:hover::before {
  opacity: 1;
}

/* csp-exec-snap removed — was never generated by JS or referenced in any HTML */