.case-studies-page { background: white; }
.case-studies-page .site-header { border-bottom: 1px solid var(--line); }

.case-hero { position: relative; overflow: hidden; padding: 105px 0 112px; background: linear-gradient(135deg, #f6f9fd 0%, #e9f2fb 100%); }
.case-hero::after { position: absolute; top: -270px; right: -160px; width: 620px; height: 620px; border: 1px solid rgba(26,62,111,.09); border-radius: 50%; box-shadow: 0 0 0 70px rgba(74,144,217,.03); content: ""; }
.case-hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.25fr .75fr; align-items: center; gap: 85px; }
.case-hero h1 { max-width: 820px; font-size: clamp(3.4rem, 6.4vw, 5.7rem); }
.case-hero h1 span { color: var(--blue); }
.case-hero-grid > div > p:not(.eyebrow) { max-width: 720px; margin-top: 27px; color: #58677a; font-size: 1.06rem; }
.case-hero .button { margin-top: 30px; }
.case-summary { padding: 30px; border: 1px solid #d4e0eb; border-radius: 13px; background: rgba(255,255,255,.86); box-shadow: 0 18px 55px rgba(26,62,111,.08); }
.case-summary > p { margin-bottom: 9px; color: var(--blue); font-size: .64rem; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.case-summary > div { display: grid; grid-template-columns: 92px 1fr; align-items: center; gap: 15px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.case-summary > div:last-child { border-bottom: 0; }
.case-summary strong { color: var(--navy); font-size: 1.75rem; }
.case-summary span { color: var(--muted); font-size: .76rem; }

.case-library { padding: 108px 0; background: var(--white); scroll-margin-top: 80px; }
.library-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 45px; }
.case-search input { width: min(320px, 100%); height: 47px; padding: 0 15px; border: 1px solid #d2dce7; border-radius: 7px; background: white; outline: none; }
.case-search input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(74,144,217,.1); }
.case-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 35px; }
.case-filters button { padding: 9px 12px; border: 1px solid #d4dee8; border-radius: 5px; background: white; color: #637084; cursor: pointer; font-size: .68rem; font-weight: 700; }
.case-filters button:hover, .case-filters button.active { border-color: var(--navy); background: var(--navy); color: white; }

.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 38px; }
.case-card { overflow: hidden; border: 1px solid var(--line); border-radius: 13px; background: white; transition: transform 180ms ease, box-shadow 180ms ease; }
.case-card:hover { box-shadow: 0 16px 40px rgba(26,62,111,.09); transform: translateY(-4px); }
.case-card[hidden] { display: none; }
.case-cover { position: relative; display: flex; height: 235px; align-items: flex-start; justify-content: space-between; overflow: hidden; padding: 24px; background: var(--navy); }
.case-cover::before { position: absolute; top: -105px; right: -65px; width: 245px; height: 245px; border: 35px solid rgba(255,255,255,.06); border-radius: 50%; content: ""; }
.case-cover > span { position: relative; color: #d2e7f9; font-size: .61rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.case-cover > b { position: relative; color: rgba(255,255,255,.16); font-size: 3.7rem; letter-spacing: -.08em; }
.cover-authority { background: linear-gradient(140deg, #163963, #286da8); }
.cover-leadership { background: linear-gradient(140deg, #183d68, #3b75a8); }
.cover-youtube { background: linear-gradient(140deg, #1d456e, #4a90d9); }
.cover-result { position: absolute; bottom: 24px; left: 24px; display: flex; align-items: baseline; gap: 10px; color: white; }
.cover-result strong { font-size: 2.3rem; letter-spacing: -.05em; }
.cover-result small { color: #c8ddf1; font-size: .61rem; }
.case-content { padding: 27px; }
.case-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.case-tags span { padding: 5px 8px; border-radius: 4px; background: var(--blue-light); color: var(--blue); font-size: .57rem; font-weight: 800; text-transform: uppercase; }
.case-content h3 { margin-top: 21px; font-size: 1.3rem; line-height: 1.38; }
.case-content > p { margin-top: 14px; color: var(--muted); font-size: .76rem; }
.result-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); }
.result-row span { color: #738095; font-size: .62rem; }
.result-row strong { display: block; margin-bottom: 2px; color: var(--navy); font-size: 1rem; }
.status-link { display: inline-block; margin-top: 23px; padding: 8px 10px; border-radius: 4px; background: #fff1cf; color: #876419; font-size: .59rem; font-weight: 800; text-transform: uppercase; }
.no-results { margin-top: 35px; color: var(--muted); text-align: center; }

.case-method { padding: 108px 0; background: white; }
.method-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 95px; align-items: start; }
.method-steps { border-top: 1px solid var(--line); }
.method-steps article { display: grid; grid-template-columns: 55px 1fr; gap: 18px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.method-steps article > span { display: grid; width: 42px; height: 42px; place-items: center; border-radius: 50%; background: var(--blue-light); color: var(--blue); font-size: .62rem; font-weight: 800; }
.method-steps h3 { font-size: 1.08rem; }
.method-steps p { margin-top: 6px; color: var(--muted); font-size: .76rem; }

.case-cta { padding: 80px 0; background: var(--blue); }
.case-cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 60px; }
.case-cta .eyebrow { margin-bottom: 10px; color: #d8ecff; }
.case-cta h2 { color: white; }
.case-cta p:not(.eyebrow) { margin-top: 13px; color: #d5e7f8; }
.case-cta .button { flex: 0 0 auto; }

@media (max-width: 980px) {
  .case-hero-grid, .method-grid { grid-template-columns: 1fr; gap: 55px; }
  .case-summary { max-width: 650px; }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .case-cta-inner { align-items: flex-start; flex-direction: column; }
}

@media (max-width: 760px) {
  .case-hero { padding: 72px 0 80px; }
  .case-hero h1 { font-size: clamp(2.8rem, 13vw, 4.2rem); }
  .case-library, .case-method { padding: 78px 0; }
  .library-heading { align-items: flex-start; flex-direction: column; }
  .case-search, .case-search input { width: 100%; }
  .case-grid { grid-template-columns: 1fr; }
  .case-cta .button { width: 100%; }
}