/* Recorded case studies. Colors follow DESIGN.md: blue rollouts, yellow resolver, red challenger, green delivery. */
.nav-links a[href='#cases'] { --nav-accent: #4285F4; }
#cases .intro { max-width: 800px; }

.case-tabs { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin-top: 34px; }
.case-tabs button {
  display: grid; gap: 3px; text-align: left; padding: 15px 16px 14px; border: 1px solid var(--soft-line);
  border-radius: 14px; background: var(--surface); color: var(--muted);
  transition: background .18s ease, border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}
.case-tabs button:hover { background: white; border-color: var(--line); transform: translateY(-1px); }
.case-tabs button[aria-selected=true] { background: white; border-color: var(--ink); box-shadow: var(--card-shadow); color: var(--ink); }
.tab-index { font: 500 11px var(--mono); letter-spacing: .08em; }
.tab-name { font-size: 16px; font-weight: 600; letter-spacing: -.02em; color: var(--ink); line-height: 1.3; }
.tab-kind { font-size: 13px; line-height: 1.4; }
.tab-gain { font: 500 12px var(--mono); margin-top: 7px; color: var(--green); }

.case-study { margin-top: 14px; }
.case-panel { border: 1px solid #e6e9ed; border-radius: 18px; background: white; box-shadow: var(--card-shadow); overflow: hidden; }
.case-header { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 36px; padding: 28px 28px 26px; border-bottom: 1px solid var(--soft-line); align-items: center; }
.case-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 14px; }
.case-meta span { font: 500 12px var(--mono); padding: 3px 9px; border-radius: 12px; background: var(--surface); color: var(--muted); }
.case-meta span:first-child { background: var(--blue-bg); color: #174ea6; }
.case-header h3 { font-size: 27px; font-weight: 550; line-height: 1.25; }
.case-task { margin-top: 13px; font-size: 16px; line-height: 1.7; color: var(--muted); }
.case-task strong { display: inline-block; margin-right: 6px; padding: 1px 8px; border-radius: 5px; background: var(--blue-bg); color: #174ea6; font-size: 12px; font-weight: 600; }

.score-track { padding: 4px 0; }
.score-line { position: relative; height: 6px; border-radius: 3px; background: #eceff1; margin: 12px 8px 20px; }
.score-fill { position: absolute; top: 0; bottom: 0; left: calc(var(--from) * 100%); width: calc((var(--to) - var(--from)) * 100%); border-radius: 3px; background: linear-gradient(90deg, #dadce0, var(--green-fill)); }
.score-dot { position: absolute; top: 50%; left: calc(var(--value) * 100%); width: 14px; height: 14px; margin: -7px 0 0 -7px; border-radius: 50%; border: 2.5px solid white; background: #9aa0a6; box-shadow: 0 0 0 1px #20212420; }
.score-dot.best { background: var(--blue); }
.score-dot.delivered { background: var(--green-fill); width: 18px; height: 18px; margin: -9px 0 0 -9px; }
.score-legend { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.score-item strong { display: block; font-size: 26px; font-weight: 500; letter-spacing: -.04em; line-height: 1.15; }
.score-item span { display: block; font-size: 13px; line-height: 1.4; color: var(--muted); margin-top: 3px; }
.score-item.best strong { color: #174ea6; }
.score-item.delivered strong { color: var(--green); }

.case-body { padding: 26px 28px 24px; }
.case-stage + .case-stage { margin-top: 30px; }
.case-body .stage-label { margin-bottom: 15px; }

.pool { display: grid; gap: 11px; }
.pool-group { display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 16px; align-items: center; }
.pool-label { font-size: 15px; line-height: 1.45; color: var(--ink); }
.pool-tiles { display: flex; flex-wrap: wrap; gap: 7px; }
.pool-tile { width: 74px; padding: 8px 9px 9px; border: 1px solid #c6d7fb; border-radius: 9px; background: #f6f9ff; }
.pool-id { display: flex; justify-content: space-between; align-items: center; font: 500 11px var(--mono); color: #174ea6; }
.pool-id em { font-style: normal; font-size: 10px; color: var(--green); }
.pool-tile strong { display: block; font-size: 17px; font-weight: 550; letter-spacing: -.03em; line-height: 1.35; }
.pool-bar { display: block; height: 3px; border-radius: 2px; background: #dfe7f7; overflow: hidden; }
.pool-bar i { display: block; height: 100%; width: calc(var(--value) * 100%); background: var(--blue); border-radius: 2px; }
.pool-tile.base { border-color: var(--green-fill); background: var(--green-bg); box-shadow: 0 0 0 1px var(--green-fill); }
.pool-tile.base .pool-id { color: var(--green); }
.pool-tile.base .pool-bar { background: #cfe8d6; }
.pool-tile.base .pool-bar i { background: var(--green-fill); }

.case-branches { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.case-branch { border: 1px solid #ece4cd; border-radius: 14px; background: white; overflow: hidden; }
.case-branch.challenger { border-color: #ecd8d5; }
.case-branch > header { display: flex; align-items: center; gap: 12px; padding: 17px 18px 15px; }
.case-branch .icon { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 50%; flex-shrink: 0; background: var(--yellow-fill); color: #654000; font: 500 22px var(--mono); }
.case-branch.challenger .icon { background: var(--red-fill); color: white; }
.case-branch h4 { margin: 0; font-size: 19px; font-weight: 550; letter-spacing: -.02em; line-height: 1.3; }
.case-branch header p { margin: 1px 0 0; font-size: 13px; color: var(--muted); line-height: 1.5; }

.case-entry { border-top: 1px solid var(--soft-line); }
.case-entry summary { display: grid; grid-template-columns: minmax(0, 1fr) auto 18px; gap: 12px; align-items: start; padding: 14px 18px; cursor: pointer; list-style: none; font-size: 16px; line-height: 1.6; }
.case-entry summary::-webkit-details-marker { display: none; }
.case-entry summary:hover { background: var(--surface); }
.case-entry summary:focus-visible { outline-offset: -3px; }
.case-chip { margin-top: 2px; padding: 2px 10px; border-radius: 12px; background: var(--amber-bg); color: var(--amber); font-size: 12px; font-weight: 600; white-space: nowrap; line-height: 1.7; }
.case-chip.refuted { background: var(--red-bg); color: var(--red); }
.case-chip.holds { background: var(--green-bg); color: var(--green); }
.case-toggle { position: relative; width: 18px; height: 26px; }
.case-toggle::before, .case-toggle::after { content: ''; position: absolute; top: 13px; left: 3px; width: 12px; height: 1.5px; background: var(--muted); transition: transform .18s ease; }
.case-toggle::after { transform: rotate(90deg); }
.case-entry[open] .case-toggle::after { transform: rotate(0); }
.case-record-label { margin: 0 18px; padding-top: 2px; font: 500 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.case-record { margin: 9px 18px 18px; padding: 4px 15px; border-radius: 10px; background: #fffdf6; border: 1px solid #f3ead0; }
.challenger .case-record { background: #fffafa; border-color: #f5e1de; }
.case-record div { display: grid; grid-template-columns: 78px minmax(0, 1fr); gap: 12px; padding: 11px 0; }
.case-record div + div { border-top: 1px dashed #e9e2cc; }
.challenger .case-record div + div { border-color: #f0dcd9; }
.case-record dt { font: 500 11px/1.9 var(--mono); letter-spacing: .04em; text-transform: uppercase; color: var(--amber); }
.challenger .case-record dt { color: var(--red); }
.case-record dd { margin: 0; font: 13px/1.7 var(--mono); color: #3c4043; overflow-wrap: anywhere; }

.case-delivery { border: 1px solid #c8dfcf; border-radius: 14px; background: #f5faf6; padding: 20px 22px 22px; }
.delivery-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 20px; }
.delivery-head .eyebrow { display: flex; align-items: center; gap: 8px; color: var(--green); }
.delivery-decision { margin: 0; font-size: 17px; }
.delivery-decision strong { font: 600 15px var(--mono); padding: 2px 8px; border-radius: 6px; background: white; border: 1px solid var(--green-fill); color: var(--green); }
.delivery-notes { margin-top: 14px; font: 13px/1.7 var(--mono); color: #3c4043; overflow-wrap: anywhere; }
.delivery-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 14px; margin-top: 16px; }
.delivery-grid > div { padding: 16px 17px 17px; border-radius: 10px; background: white; border: 1px solid #dcebdf; }
.delivery-grid h4 { margin: 0 0 9px; font: 500 11px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--green); }
.delivery-grid h4 span { color: var(--muted); letter-spacing: 0; text-transform: none; }
.delivery-grid h4:not(:first-child) { margin-top: 18px; }
.delivery-grid p { margin: 0; font-size: 15px; line-height: 1.65; overflow-wrap: anywhere; }
.work-to { margin-top: 7px !important; color: var(--green); }
.work-item + .work-item { margin-top: 14px; padding-top: 14px; border-top: 1px dashed #dcebdf; }
.change + .change { margin-top: 10px !important; }
.change code { font: 500 12px var(--mono); padding: 1px 7px; margin-right: 4px; border-radius: 5px; background: var(--green-bg); color: var(--green); }
.open-title { font-weight: 550; }
.open-item ul { margin: 8px 0; padding-left: 19px; color: var(--muted); font-size: 14px; line-height: 1.65; }
.open-item li + li { margin-top: 5px; }
.open-prefer { color: var(--muted); font-size: 14px !important; }
.open-prefer strong { color: var(--ink); font-weight: 550; }

.case-takeaway { margin-top: 26px; padding-left: 18px; border-left: 3px solid var(--ink); font-size: 19px; line-height: 1.6; max-width: 900px; }
.case-nav { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--soft-line); }
.case-nav span { font: 500 12px var(--mono); color: var(--muted); }
.case-nav .button { border-color: transparent; background: var(--surface); }

@media (prefers-reduced-motion: no-preference) {
  .case-header, .case-stage, .case-takeaway { animation: case-in .45s ease both; }
  .case-stage:nth-of-type(1) { animation-delay: .06s; }
  .case-stage:nth-of-type(2) { animation-delay: .12s; }
  .case-stage:nth-of-type(3) { animation-delay: .18s; }
  .case-takeaway { animation-delay: .24s; }
  .pool-bar i, .score-fill { animation: case-grow .7s .15s ease both; transform-origin: left; }
  .score-dot { animation: case-pop .4s .35s ease both; }
  @keyframes case-in { from { opacity: 0; transform: translateY(10px); } }
  @keyframes case-grow { from { transform: scaleX(0); } }
  @keyframes case-pop { from { opacity: 0; transform: scale(.4); } }
}

@media (max-width: 1050px) {
  .case-tabs { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .case-header { grid-template-columns: 1fr; gap: 22px; }
  .score-track { max-width: 420px; }
  .pool-group { grid-template-columns: 1fr; gap: 7px; }
}
@media (max-width: 760px) {
  .case-branches { grid-template-columns: 1fr; }
  .case-tabs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 680px) {
  .case-tabs { gap: 7px; margin-top: 24px; }
  .case-tabs button { padding: 12px 12px 11px; border-radius: 11px; }
  .tab-name { font-size: 15px; }
  .case-panel { border-radius: 13px; }
  .case-header { padding: 20px 16px; }
  .case-header h3 { font-size: 23px; }
  .case-body { padding: 20px 14px 18px; }
  .case-entry summary { grid-template-columns: minmax(0, 1fr) 18px; padding: 13px 14px; }
  .case-entry summary .case-chip { grid-row: 2; justify-self: start; }
  .case-toggle { grid-row: 1; grid-column: 2; }
  .case-record-label { margin: 0 14px; }
  .case-record { margin: 9px 12px 14px; padding: 2px 12px; }
  .case-record div { grid-template-columns: 1fr; gap: 1px; }
  .case-delivery { padding: 16px 14px; }
  .delivery-grid { grid-template-columns: 1fr; }
  .pool-tile { width: 66px; }
  .case-takeaway { font-size: 17px; }
  .case-nav span { display: none; }
}