/* ============================================================
   Recycled-water case study — bespoke elements
   ============================================================ */

/* central challenge / insight callouts */
.cs-challenge, .cs-insight {
  margin-top: var(--s4); padding: 24px 26px; border-radius: var(--r);
  border: 2px solid var(--ink); background: var(--card);
}
.cs-challenge-k, .cs-insight span { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--tang-ink); display: block; margin-bottom: 10px; }
.cs-challenge p { font-family: var(--display); font-weight: 600; font-size: clamp(20px, 2.5vw, 27px); line-height: 1.25; letter-spacing: -0.015em; }
.cs-insight { background: var(--marker); border-color: var(--ink); }
.cs-insight span { color: color-mix(in srgb, var(--on-marker) 72%, transparent); }
.cs-insight p { font-size: 17px; line-height: 1.5; color: var(--on-marker); }
.cs-insight p i { font-style: italic; font-weight: 600; }

/* methodological principle pull-quote */
.cs-principle { margin-top: var(--s4); padding-left: 22px; border-left: 4px solid var(--tang); }
.cs-principle p { font-family: var(--display); font-weight: 600; font-size: clamp(19px, 2.3vw, 25px); line-height: 1.3; letter-spacing: -0.015em; color: var(--ink); }
.cs-principle p b { color: var(--tang-ink); }

/* said self vs felt self */
.cs-saidfelt { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: var(--s4); }
.sf-card { padding: 26px; border-radius: var(--r); border: 2px solid var(--ink); }
.sf-card span { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; display: block; margin-bottom: 14px; }
.sf-card p { font-family: var(--display); font-weight: 700; font-size: clamp(22px, 3vw, 30px); letter-spacing: -0.02em; line-height: 1.1; }
.sf-card.said { background: var(--card); }
.sf-card.said span { color: var(--ink-faint); }
.sf-card.felt { background: var(--ink); color: var(--paper); }
.sf-card.felt span { color: var(--marker-fg); }
.sf-card.felt p i { font-style: italic; color: var(--marker-fg); }
@media (max-width: 640px) { .cs-saidfelt { grid-template-columns: 1fr; } }

/* version stepper */
.vstep { border: 2.5px solid var(--ink); border-radius: var(--r-lg); overflow: hidden; background: var(--card); box-shadow: 6px 7px 0 var(--ink); }
.vstep-tabs { display: flex; border-bottom: 2px solid var(--ink); }
.vstep-tab { flex: 1; padding: 14px 8px; background: var(--paper-2); border: none; border-right: 2px solid var(--ink); cursor: pointer; font-family: var(--mono); font-weight: 700; font-size: 15px; color: var(--ink-soft); transition: background 160ms, color 160ms; }
.vstep-tab:last-child { border-right: none; }
.vstep-tab:hover { background: var(--card); color: var(--ink); }
.vstep-tab.is-on { background: var(--tang); color: var(--on-accent); }
.vstep-body { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 0; animation: vstepIn 360ms var(--ease); }
@keyframes vstepIn { from { transform: translateY(8px); } to { transform: none; } }
.vstep-diagram { background: var(--paper-2); border-right: 2px dashed var(--line-2); padding: 26px; display: grid; place-items: center; min-height: 168px; }
.vstep-meta { padding: 24px 26px; }
.vstep-name { font-family: var(--display); font-weight: 700; font-size: 21px; letter-spacing: -0.01em; display: block; margin-bottom: 8px; }
.vstep-struct { font-size: 15.5px; color: var(--ink-soft); line-height: 1.45; margin-bottom: 16px; }
.vstep-tags { display: flex; flex-direction: column; gap: 8px; }
.vstep-tag { font-size: 12.5px; padding: 7px 11px; border-radius: 8px; line-height: 1.35; }
.vstep-tag.ok { background: color-mix(in srgb, var(--ok) 14%, transparent); color: color-mix(in srgb, var(--ok) 90%, var(--ink)); }
.vstep-tag.no { background: color-mix(in srgb, var(--tang) 12%, transparent); color: var(--tang-ink); }
@media (max-width: 600px) { .vstep-body { grid-template-columns: 1fr; } .vstep-diagram { border-right: none; border-bottom: 2px dashed var(--line-2); } }

/* stepper diagrams */
.vd-binary { display: flex; flex-direction: column; align-items: center; gap: 14px; }
.vd-binary-row { display: flex; align-items: center; gap: 12px; }
.vd-chip { display: flex; flex-direction: column; align-items: center; gap: 1px; padding: 12px 14px; border: 2px solid var(--ink); border-radius: 10px; font-family: var(--mono); font-size: 12px; font-weight: 700; letter-spacing: 0; line-height: 1.1; background: var(--card); text-align: center; }
.vd-chip b { font-size: 9.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; opacity: 0.7; }
.vd-chip.dark { background: var(--ink); color: var(--paper); }
.vd-vs { font-family: var(--mono); font-size: 12px; font-style: italic; color: var(--ink-faint); }
.vd-q { font-size: 12px; color: var(--tang-ink); }
.vd-bars { display: flex; align-items: flex-end; gap: 8px; height: 96px; position: relative; }
.vd-bar { width: 20px; background: var(--tang); border: 2px solid var(--ink); border-radius: 3px 3px 0 0; }
.vd-need { position: absolute; bottom: -22px; left: 50%; transform: translateX(-50%); font-size: 11px; color: var(--tang-ink); white-space: nowrap; }
.vd-spectrum { width: 100%; }
.vd-grad { display: block; height: 16px; border-radius: 100px; border: 2px solid var(--ink); background: linear-gradient(90deg, var(--ok), #9bcf3e, var(--marker), #ffb24a, var(--tang)); }
.vd-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--ink-soft); margin-top: 6px; }
.vd-srcs { display: flex; justify-content: space-between; font-size: 10px; color: var(--ink-faint); margin-top: 10px; gap: 4px; }
.vd-digital { display: flex; align-items: center; gap: 14px; }
.vd-drag { font-size: 13px; color: var(--ink-soft); }
.vd-drop { padding: 16px 20px; border: 2px dashed var(--ink); border-radius: 10px; font-family: var(--mono); font-weight: 700; font-size: 14px; background: var(--card); }

/* the trap */
.cs-trap { margin-top: var(--s4); display: flex; flex-direction: column; gap: 12px; }
.cs-trap-row { display: flex; align-items: center; gap: 14px; }
.cs-trap-amt { font-size: 14px; font-weight: 700; width: 32px; flex-shrink: 0; }
.cs-trap-bar { height: 26px; border: 2px solid var(--ink); border-radius: 6px; background: repeating-linear-gradient(45deg, var(--card), var(--card) 6px, var(--paper-2) 6px, var(--paper-2) 12px); flex: 1; max-width: 360px; }
.cs-trap-bar.short { max-width: 150px; background: var(--tang); }
.cs-trap-lbl { font-size: 14px; color: var(--ink-soft); }

/* unprompted voices */
.cs-voices { display: flex; flex-direction: column; gap: 12px; margin-top: var(--s4); }
.cs-voice { position: relative; padding: 18px 22px 18px 48px; background: var(--card); border: 2px solid var(--line); border-radius: var(--r); font-size: 17px; font-style: italic; color: var(--ink); }
.cs-voice-mark { position: absolute; left: 18px; top: 14px; font-family: var(--display); font-size: 30px; color: var(--tang); line-height: 1; }

/* gap chain */
.cs-gap { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: var(--s4); }
.cs-gap-node { padding: 14px 18px; background: var(--ink); color: var(--paper); border-radius: 100px; font-family: var(--display); font-weight: 700; font-size: 15px; letter-spacing: -0.01em; }
.cs-gap-link { font-size: 12px; color: var(--tang-ink); text-transform: uppercase; letter-spacing: 0.08em; }
.cs-closer { margin-top: var(--s5); font-size: 20px; }

/* ---------- second work card (no flip demo, uses stepper) ---------- */
.casecard.last { margin-bottom: 0; }
.casecard .case-visual .vstep { width: 100%; }
/* the recycled-water card uses the stepper (not a sticky flip demo) */
.case:has(.vstep) .case-visual { position: static; align-self: stretch; }