/* ==========================================================================
   Case studies: list + detail
   (uses .page-hero / .crumbs from about.css)
   ========================================================================== */

/* Intro */
.cs-intro { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(40px, 6vw, 90px); align-items: center; }
.cs-numbers { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.cs-num { padding: 28px; border-radius: var(--radius-lg); background: var(--bg-soft); border: 1px solid var(--line); }
.cs-num strong { display: block; font-size: clamp(2rem, 3.2vw, 2.8rem); font-weight: 800; letter-spacing: -.04em; color: var(--navy-700); line-height: 1; margin-bottom: 8px; }
.cs-num span { font-size: .92rem; line-height: 1.4; display: block; }
.cs-num:nth-child(1) { background: var(--navy-800); border-color: var(--navy-800); }
.cs-num:nth-child(4) { background: var(--blue-600); border-color: var(--blue-600); }
.cs-num:nth-child(1) strong, .cs-num:nth-child(1) span, .cs-num:nth-child(4) strong, .cs-num:nth-child(4) span { color: #fff; }

/* Clients strip */
.clients { margin-top: 70px; padding-top: 40px; border-top: 1px solid var(--line); }
.clients p { font-size: .8rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); text-align: center; margin-bottom: 24px; }
.clients ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 40px; }
.clients li { font-size: 1.15rem; font-weight: 800; letter-spacing: -.02em; color: #9aa6ba; transition: color .3s; }
.clients li:hover { color: var(--navy-700); }

/* Filters */
.cs-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; margin-bottom: 40px; }
.cs-filters { display: flex; flex-wrap: wrap; gap: 8px; }
.cs-filters button { font: inherit; font-size: .9rem; font-weight: 700; padding: 10px 18px; border-radius: 999px; border: 1px solid var(--line); background: #fff; color: var(--body); cursor: pointer; transition: .25s; }
.cs-filters button:hover { border-color: var(--blue-600); color: var(--blue-600); }
.cs-filters button.is-active { background: var(--blue-600); border-color: var(--blue-600); color: #fff; }
.cs-count { font-size: .9rem; color: var(--muted); font-weight: 600; }

/* Cards */
.cs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.cs-card { background: #fff; border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--line); display: flex; flex-direction: column; transition: transform .4s var(--ease), box-shadow .4s, opacity .4s; }
.cs-card:hover { transform: translateY(-8px); box-shadow: var(--shadow); }
.cs-card.is-hidden { display: none; }
.cs-thumb { position: relative; aspect-ratio: 4/3; overflow: hidden; }
.cs-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .9s var(--ease); }
.cs-card:hover .cs-thumb img { transform: scale(1.07); }
.cs-thumb::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(6,22,51,.55), transparent 50%); }
.cs-year { position: absolute; z-index: 2; left: 18px; bottom: 16px; color: #fff; font-size: 1.6rem; font-weight: 800; letter-spacing: -.04em; line-height: 1; }
.cs-sector { position: absolute; z-index: 2; left: 18px; top: 18px; background: rgba(255,255,255,.95); color: var(--navy-700); font-size: .7rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; padding: 7px 12px; border-radius: 999px; }
.cs-card[data-filter="heritage"] .cs-sector { background: var(--orange); color: #fff; }
.cs-body { padding: 26px 28px 28px; display: flex; flex-direction: column; flex: 1; }
.cs-body h3 { font-size: 1.22rem; margin-bottom: 8px; }
.cs-client { font-size: .88rem; font-weight: 600; color: var(--muted); margin-bottom: 12px; }
.cs-body p { font-size: .95rem; margin-bottom: 20px; flex: 1; }
.cs-cable { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 12px; background: var(--bg-soft); margin-bottom: 20px; }
.cs-cable svg { flex: none; width: 30px; height: 30px; color: var(--blue-600); }
.cs-cable small { display: block; font-size: .68rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.cs-cable strong { display: block; font-size: .9rem; color: var(--ink); line-height: 1.3; }

/* ==========================================================================
   Detail page
   ========================================================================== */
.cs-hero .container { padding-bottom: 170px; }
.cs-hero h1 { font-size: clamp(2.2rem, 4.6vw, 3.8rem); }
.cs-meta-bar { position: relative; z-index: 5; margin-top: -80px; }
.cs-meta { display: grid; grid-template-columns: repeat(5, 1fr); background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow); border: 1px solid var(--line); overflow: hidden; }
.cs-meta div { padding: 26px 26px; border-right: 1px solid var(--line); }
.cs-meta div:last-child { border-right: 0; background: var(--blue-100); }
.cs-meta small { display: block; font-size: .7rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.cs-meta strong { color: var(--ink); font-size: 1rem; line-height: 1.35; display: block; }

.cs-layout { display: grid; grid-template-columns: 1.6fr 1fr; gap: clamp(40px, 6vw, 80px); align-items: start; }
.cs-article h2 { font-size: clamp(1.6rem, 2.6vw, 2.1rem); }
.cs-article .lead { margin-bottom: 40px; }
.cs-step { display: grid; grid-template-columns: 56px 1fr; gap: 20px; padding: 30px 0; border-top: 1px solid var(--line); }
.cs-step-num { width: 56px; height: 56px; border-radius: 16px; display: grid; place-items: center; font-weight: 800; color: #fff; background: var(--navy-800); }
.cs-step + .cs-step .cs-step-num { background: var(--blue-600); }
.cs-step + .cs-step + .cs-step .cs-step-num { background: var(--orange); }
.cs-step h3 { margin-bottom: 8px; }
.cs-step p { margin: 0; }

.cs-aside { position: sticky; top: 100px; display: grid; gap: 22px; }
.cs-facts { background: var(--navy-900); color: #c3cde0; border-radius: var(--radius-lg); padding: 32px; }
.cs-facts h3 { color: #fff; font-size: 1.1rem; margin-bottom: 18px; }
.cs-fact { padding: 18px 0; border-top: 1px solid rgba(255,255,255,.1); }
.cs-fact strong { display: block; font-size: 1.9rem; font-weight: 800; letter-spacing: -.04em; color: #fff; line-height: 1.1; }
.cs-fact span { font-size: .9rem; }
.cs-enquire { border-radius: var(--radius-lg); padding: 30px; background: var(--blue-100); }
.cs-enquire h3 { font-size: 1.15rem; }
.cs-enquire p { font-size: .95rem; }

.cs-gallery { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 18px; margin-top: 70px; }
.cs-gallery img { width: 100%; height: 340px; object-fit: cover; border-radius: var(--radius-lg); }

.cs-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 70px; }
.cs-pager a { display: flex; align-items: center; gap: 18px; padding: 22px; border-radius: var(--radius-lg); border: 1px solid var(--line); transition: border-color .3s, box-shadow .3s; }
.cs-pager a:hover { border-color: var(--blue-600); box-shadow: var(--shadow); }
.cs-pager a.next { flex-direction: row-reverse; text-align: right; }
.cs-pager img { width: 84px; height: 84px; border-radius: 14px; object-fit: cover; flex: none; }
.cs-pager small { display: block; font-size: .72rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; color: var(--blue-600); margin-bottom: 4px; }
.cs-pager strong { color: var(--ink); line-height: 1.3; display: block; }

.cs-note { font-size: .82rem; color: var(--muted); margin-top: 18px; }

/* Responsive */
@media (max-width: 1080px) {
  .cs-grid { grid-template-columns: 1fr 1fr; }
  .cs-meta { grid-template-columns: repeat(3, 1fr); }
  .cs-meta div:nth-child(3) { border-right: 0; }
  .cs-meta div:nth-child(-n+3) { border-bottom: 1px solid var(--line); }
}
@media (max-width: 900px) {
  .cs-intro, .cs-layout { grid-template-columns: 1fr; }
  .cs-aside { position: static; }
  .cs-gallery { grid-template-columns: 1fr 1fr; }
  .cs-gallery img:first-child { grid-column: span 2; }
}
@media (max-width: 640px) {
  .cs-grid, .cs-pager { grid-template-columns: 1fr; }
  .cs-meta { grid-template-columns: 1fr 1fr; }
  .cs-meta div { border-right: 0 !important; border-bottom: 1px solid var(--line); padding: 18px 20px; }
  .cs-meta div:last-child { grid-column: span 2; border-bottom: 0; }
  .cs-gallery img { height: 200px; }
  .cs-step { grid-template-columns: 1fr; gap: 14px; }
  .cs-filters { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; width: 100%; padding-bottom: 4px; }
  .cs-filters button { flex: none; }
}

/* Customer review on case study detail */
.cs-review { margin-top: 70px; display: grid; grid-template-columns: 110px 1fr; gap: 30px; align-items: start; padding: clamp(32px, 5vw, 56px); border-radius: var(--radius-lg); background: linear-gradient(135deg, var(--navy-900), var(--navy-700)); color: #c3cde0; position: relative; overflow: hidden; }
.cs-review::after { content: ""; position: absolute; width: 360px; height: 360px; border-radius: 50%; border: 60px solid rgba(255,255,255,.04); right: -120px; bottom: -160px; }
.cs-review-mark { font-size: 9rem; line-height: .8; font-weight: 800; color: var(--orange); font-family: Georgia, serif; }
.cs-review .eyebrow { color: #9fc0ff; }
.cs-stars { display: block; color: var(--yellow); font-size: 1.2rem; letter-spacing: 3px; margin-bottom: 10px; }
.cs-review blockquote { margin: 0 0 24px; font-size: clamp(1.2rem, 2vw, 1.55rem); line-height: 1.5; font-weight: 600; color: #fff; letter-spacing: -.01em; position: relative; z-index: 1; }
.cs-review blockquote.is-placeholder { color: rgba(255,255,255,.55); font-style: italic; font-weight: 500; }
.cs-review-by strong { display: block; color: #fff; }
.cs-review-by span { font-size: .9rem; }
@media (max-width: 640px) { .cs-review { grid-template-columns: 1fr; gap: 0; } .cs-review-mark { font-size: 6rem; } }