/* ==========================================================================
   Case Study Page — Goldcattle  (UI v2)
   Page: /case-study/inconel-718-5-axis-impeller/
   Scope: .gc-case / .gc-case-toc only. Does not touch global header/nav/footer.
   Reuses tokens from /services/1.css with safe fallbacks.
   ========================================================================== */

.gc-case {
  --gcc-blue: var(--blue, #0052cc);
  --gcc-blue-d: #003d99;
  --gcc-navy: #0f2747;
  --gcc-accent: var(--accent, #00a3c4);
  --gcc-ink: #1c2733;
  --gcc-muted: var(--text-3, #5f6b7d);
  --gcc-line: var(--border, #e4e9f0);
  --gcc-soft: #f7f9fc;
  --gcc-soft2: #eff3f9;
  --gcc-white: #ffffff;
  --gcc-amber: #f59e0b;
  --gcc-amber-bg: #fffbf0;
  --gcc-amber-line: #fde8b8;
  --gcc-grad: linear-gradient(135deg, #0052cc 0%, #00a3c4 100%);
  --gcc-r: 14px;
  --gcc-r-sm: 10px;
  --gcc-r-xs: 8px;
  --gcc-sh: 0 1px 2px rgba(15, 39, 71, .04), 0 4px 12px rgba(15, 39, 71, .05);
  --gcc-sh-hi: 0 8px 28px rgba(15, 39, 71, .11);
  font-family: inherit;
  line-height: 1.6;
  color: var(--gcc-ink);
}

/* ==================================================================
   1. PAGE HEADER
   ================================================================== */
.gc-case-hero {
  position: relative;
  background:
    radial-gradient(1200px 380px at 15% -10%, #e8f1fc 0%, rgba(232,241,252,0) 60%),
    linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
  border-bottom: 1px solid var(--gcc-line);
  padding: clamp(40px, 6vw, 72px) 0 clamp(32px, 4vw, 48px);
  overflow: hidden;
}
.gc-case-hero::after {
  content: ""; position: absolute; right: -80px; top: -80px;
  width: 320px; height: 320px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,163,196,.10) 0%, rgba(0,163,196,0) 70%);
  pointer-events: none;
}
.gc-case-hero__inner {
  position: relative; max-width: 1040px; margin: 0 auto; padding: 0 clamp(18px, 4vw, 32px);
}
.gc-case-hero__eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 11px; letter-spacing: .2em; text-transform: uppercase;
  font-weight: 700; color: var(--gcc-blue); margin: 0 0 16px;
  padding: 6px 14px; background: rgba(0, 82, 204, .07);
  border: 1px solid rgba(0, 82, 204, .16); border-radius: 999px;
}
.gc-case-hero__eyebrow::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--gcc-blue); display: inline-block;
}
.gc-case-hero__title {
  margin: 0 0 16px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.16; font-weight: 800; letter-spacing: -.022em;
  color: var(--gcc-navy);
}
.gc-case-hero__lede {
  margin: 0; font-size: clamp(15px, 1.5vw, 18px);
  color: var(--gcc-muted); max-width: 780px; line-height: 1.7;
}

/* quick facts — card style, no hairline grid */
.gc-case-facts {
  list-style: none; margin: 32px 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px;
}
@media (min-width: 760px) { .gc-case-facts { grid-template-columns: repeat(5, minmax(0, 1fr)); } }
.gc-case-facts > div {
  background: var(--gcc-white);
  border: 1px solid var(--gcc-line); border-radius: var(--gcc-r-sm);
  padding: 16px 16px 14px; box-shadow: var(--gcc-sh);
  display: flex; flex-direction: column; gap: 5px;
  position: relative; overflow: hidden;
}
.gc-case-facts > div::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--gcc-grad);
}
.gc-case-facts dt {
  font-size: 10px; letter-spacing: .13em; text-transform: uppercase;
  font-weight: 700; color: var(--gcc-muted); line-height: 1.3;
}
.gc-case-facts dd {
  margin: 0; font-size: 14.5px; font-weight: 600; color: var(--gcc-navy); line-height: 1.4;
}

/* ==================================================================
   2. STICKY CONTENTS (wide screens only)
   ================================================================== */
.gc-case-toc {
  /* parks itself just outside the 1040px content column (RIGHT side), never on top of it */
  position: fixed;
  left: min(calc(100% - 212px), calc(50% + 540px));
  top: 50%; transform: translateY(-50%);
  width: 196px; max-height: 74vh; overflow-y: auto;
  padding: 18px 16px; z-index: 40;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(10px);
  border: 1px solid var(--gcc-line); border-radius: var(--gcc-r);
  box-shadow: var(--gcc-sh);
  opacity: 0; visibility: hidden; transition: opacity .25s ease, visibility .25s ease;
}
.gc-case-toc.is-on { opacity: 1; visibility: visible; }
@media (max-width: 1499px) { .gc-case-toc { display: none; } }
.gc-case-toc__t {
  margin: 0 0 10px; font-size: 10px; letter-spacing: .16em;
  text-transform: uppercase; font-weight: 800; color: var(--gcc-muted);
}
.gc-case-toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.gc-case-toc li { counter-increment: toc; }
.gc-case-toc a {
  display: flex; gap: 8px; padding: 6px 8px; border-radius: 6px;
  font-size: 12.5px; line-height: 1.4; color: var(--gcc-muted);
  text-decoration: none; transition: background .16s ease, color .16s ease;
}
.gc-case-toc a::before {
  content: counter(toc, decimal-leading-zero);
  font-size: 10px; font-weight: 700; color: #b6c1d1; padding-top: 1px;
}
.gc-case-toc a:hover { background: var(--gcc-soft); color: var(--gcc-navy); }
.gc-case-toc a.is-active { background: rgba(0, 82, 204, .08); color: var(--gcc-blue); font-weight: 600; }
.gc-case-toc a.is-active::before { color: var(--gcc-blue); }
.gc-case-toc::-webkit-scrollbar { width: 4px; }
.gc-case-toc::-webkit-scrollbar-thumb { background: #d5dde8; border-radius: 2px; }

/* ---- reading progress bar (all widths) ---- */
.gc-case-prog {
  position: fixed; left: 0; right: 0; top: 0; height: 3px;
  z-index: 9990; background: transparent; pointer-events: none;
}
.gc-case-prog span {
  display: block; height: 100%; width: 0;
  background: var(--gcc-grad, linear-gradient(90deg, #0052cc 0%, #00a3c4 100%));
  transition: width .1s linear;
}

/* ==================================================================
   3. SECTION SHELL
   ================================================================== */
.gc-case__section { padding: clamp(40px, 5.5vw, 68px) clamp(18px, 4vw, 32px); }
.gc-case__section, .gc-case-cta { scroll-margin-top: 110px; }
.gc-case__section--alt {
  background: var(--gcc-soft);
  border-top: 1px solid var(--gcc-line);
  border-bottom: 1px solid var(--gcc-line);
}
.gc-case__inner { max-width: 1040px; margin: 0 auto; }
.gc-case__label {
  display: flex; align-items: center; gap: 9px;
  font-size: 11px; letter-spacing: .18em; text-transform: uppercase;
  font-weight: 800; color: var(--gcc-blue); margin: 0 0 10px;
}
.gc-case__label::before {
  content: ""; flex: 0 0 auto; width: 16px; height: 3px;
  border-radius: 2px; background: var(--gcc-grad);
}
.gc-case__h2 {
  margin: 0 0 14px; font-size: clamp(23px, 2.8vw, 32px);
  line-height: 1.22; font-weight: 800; color: var(--gcc-navy); letter-spacing: -.018em;
}
.gc-case__sub {
  margin: 0 0 30px; font-size: 16px; color: var(--gcc-muted);
  max-width: 780px; line-height: 1.7;
}
.gc-case__p { margin: 0 0 15px; font-size: 15.5px; line-height: 1.75; color: var(--gcc-ink); }
.gc-case__p:last-child { margin-bottom: 0; }
.gc-case__p strong { color: var(--gcc-navy); font-weight: 650; }
.gc-case__p a { color: var(--gcc-blue); font-weight: 600; text-decoration: none;
  border-bottom: 1px solid rgba(0, 82, 204, .3); }
.gc-case__p a:hover { border-bottom-color: var(--gcc-blue); }

/* ==================================================================
   4. REQUIREMENT TABLE
   ================================================================== */
.gc-case-req {
  margin: 0; border: 1px solid var(--gcc-line); border-radius: var(--gcc-r);
  overflow: hidden; background: var(--gcc-white); box-shadow: var(--gcc-sh);
}
.gc-case-req > div {
  display: grid; grid-template-columns: 1fr; gap: 3px;
  padding: 14px 20px; border-bottom: 1px solid var(--gcc-line);
  transition: background .16s ease;
}
.gc-case-req > div:last-child { border-bottom: none; }
.gc-case-req > div:hover { background: #fafcff; }
@media (min-width: 660px) {
  .gc-case-req > div { grid-template-columns: 210px 1fr; gap: 24px; align-items: baseline; }
}
.gc-case-req dt {
  font-size: 11.5px; letter-spacing: .09em; text-transform: uppercase;
  font-weight: 700; color: var(--gcc-muted); line-height: 1.5;
}
.gc-case-req dd { margin: 0; font-size: 15px; color: var(--gcc-ink); line-height: 1.65; }

/* ==================================================================
   5. NUMBERED CARDS — challenge (amber) vs strategy (blue)
   ================================================================== */
.gc-case-list {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: 1fr; gap: 14px;
}
@media (min-width: 860px) { .gc-case-list--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.gc-case-item {
  position: relative; background: var(--gcc-white);
  border: 1px solid var(--gcc-line); border-radius: var(--gcc-r);
  padding: 22px 22px 20px 74px;
  box-shadow: var(--gcc-sh);
  transition: box-shadow .2s ease, transform .2s ease, border-color .2s ease;
}
.gc-case-item:hover {
  box-shadow: var(--gcc-sh-hi); transform: translateY(-2px); border-color: #cfdae9;
}
.gc-case-item__num {
  position: absolute; left: 20px; top: 20px;
  width: 34px; height: 34px; border-radius: var(--gcc-r-xs);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 800; color: #fff;
  background: var(--gcc-grad);
  box-shadow: 0 3px 10px rgba(0, 82, 204, .28);
}
.gc-case-item h3 {
  margin: 0 0 8px; font-size: 17px; font-weight: 700;
  color: var(--gcc-navy); line-height: 1.35;
}
.gc-case-item p { margin: 0; font-size: 14.5px; line-height: 1.7; color: var(--gcc-ink); }

/* challenge variant — amber accent (this is the PROBLEM) */
.gc-case-item--challenge {
  background: linear-gradient(180deg, var(--gcc-amber-bg) 0%, #ffffff 55%);
  border-color: var(--gcc-amber-line);
}
.gc-case-item--challenge:hover { border-color: #f5d08a; }
.gc-case-item--challenge .gc-case-item__num {
  background: linear-gradient(135deg, #f59e0b 0%, #ea8a04 100%);
  box-shadow: 0 3px 10px rgba(245, 158, 11, .32);
}

/* ==================================================================
   6. MATERIAL BLOCK
   ================================================================== */
.gc-case-mat { display: grid; grid-template-columns: 1fr; gap: 26px; align-items: start; }
@media (min-width: 880px) { .gc-case-mat { grid-template-columns: 1.05fr 1fr; gap: 36px; } }
.gc-case-mat__props {
  margin: 0; border: 1px solid var(--gcc-line); border-radius: var(--gcc-r);
  overflow: hidden; background: var(--gcc-white); box-shadow: var(--gcc-sh);
}
.gc-case-mat__props > div {
  display: grid; grid-template-columns: 1fr; gap: 3px;
  padding: 13px 18px; border-bottom: 1px solid var(--gcc-line);
}
.gc-case-mat__props > div:last-child { border-bottom: none; }
@media (min-width: 480px) {
  .gc-case-mat__props > div { grid-template-columns: 140px 1fr; gap: 18px; align-items: baseline; }
}
.gc-case-mat__props dt {
  font-size: 11.5px; letter-spacing: .07em; text-transform: uppercase;
  font-weight: 700; color: var(--gcc-muted);
}
.gc-case-mat__props dd { margin: 0; font-size: 14.5px; color: var(--gcc-ink); line-height: 1.6; }

/* ==================================================================
   7. SPEC CARDS
   ================================================================== */
.gc-case-specs {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px;
}
@media (min-width: 840px) { .gc-case-specs { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.gc-case-spec {
  position: relative; text-align: center;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  border: 1px solid #d9e4f2; border-top: 3px solid var(--gcc-blue);
  border-radius: var(--gcc-r); padding: 24px 14px 20px;
  box-shadow: var(--gcc-sh);
  transition: transform .2s ease, box-shadow .2s ease;
}
.gc-case-spec:hover { transform: translateY(-3px); box-shadow: var(--gcc-sh-hi); }
.gc-case-spec__val {
  display: block; font-size: clamp(22px, 2.8vw, 30px); font-weight: 800;
  line-height: 1.1; margin-bottom: 8px; letter-spacing: -.02em;
  background: var(--gcc-grad);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: var(--gcc-blue);
}
.gc-case-spec__lbl {
  display: block; font-size: 11px; letter-spacing: .09em;
  text-transform: uppercase; font-weight: 700; color: var(--gcc-muted); line-height: 1.45;
}

/* ==================================================================
   8. INSPECTION LIST
   ================================================================== */
.gc-case-insp { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.gc-case-insp li {
  position: relative; padding: 18px 20px 18px 58px;
  background: var(--gcc-white); border: 1px solid var(--gcc-line);
  border-radius: var(--gcc-r); box-shadow: var(--gcc-sh);
  transition: box-shadow .2s ease, border-color .2s ease;
}
.gc-case-insp li:hover { border-color: #cfdae9; box-shadow: var(--gcc-sh-hi); }
.gc-case-insp li::before {
  content: ""; position: absolute; left: 18px; top: 20px;
  width: 24px; height: 24px; border-radius: 50%;
  background: rgba(0, 82, 204, .10); border: 1.5px solid var(--gcc-blue);
}
.gc-case-insp li::after {
  content: ""; position: absolute; left: 26px; top: 27px;
  width: 9px; height: 5px;
  border-left: 2px solid var(--gcc-blue); border-bottom: 2px solid var(--gcc-blue);
  transform: rotate(-45deg);
}
.gc-case-insp h3 { margin: 0 0 6px; font-size: 16.5px; font-weight: 700; color: var(--gcc-navy); }
.gc-case-insp p { margin: 0; font-size: 14.5px; line-height: 1.7; color: var(--gcc-ink); }

/* ==================================================================
   9. RESULT PANEL
   ================================================================== */
.gc-case-result {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #0f2747 0%, #14345c 100%);
  border-radius: var(--gcc-r); padding: clamp(24px, 3.5vw, 36px);
  box-shadow: 0 12px 34px rgba(15, 39, 71, .20);
}
.gc-case-result::before {
  content: ""; position: absolute; right: -60px; top: -60px;
  width: 240px; height: 240px; border-radius: 50%;
  background: radial-gradient(circle, rgba(0,163,196,.22) 0%, rgba(0,163,196,0) 70%);
  pointer-events: none;
}
.gc-case-result__grid {
  position: relative; margin: 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px 24px;
}
@media (min-width: 700px) { .gc-case-result__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.gc-case-result__grid > div {
  display: flex; flex-direction: column; gap: 4px;
  padding-bottom: 12px; border-bottom: 1px solid rgba(255, 255, 255, .12);
}
.gc-case-result__grid dt {
  font-size: 10.5px; letter-spacing: .13em; text-transform: uppercase;
  font-weight: 700; color: #8fa6c4;
}
.gc-case-result__grid dd {
  margin: 0; font-size: 15.5px; font-weight: 600; color: #fff; line-height: 1.45;
}
.gc-case-result__note {
  position: relative; margin: 22px 0 0; padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, .14);
  font-size: 13.5px; line-height: 1.7; color: #b9cadd; font-style: italic;
}

/* ==================================================================
   10. DEMONSTRATES (checklist)
   ================================================================== */
.gc-case-demo { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
@media (min-width: 860px) { .gc-case-demo { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.gc-case-demo li {
  display: flex; gap: 13px; padding: 18px 20px;
  background: var(--gcc-white); border: 1px solid var(--gcc-line);
  border-radius: var(--gcc-r); box-shadow: var(--gcc-sh);
  transition: box-shadow .2s ease, transform .2s ease;
}
.gc-case-demo li:hover { box-shadow: var(--gcc-sh-hi); transform: translateY(-2px); }
.gc-case-demo li::before {
  content: ""; flex: 0 0 auto;
  width: 22px; height: 22px; border-radius: 50%; margin-top: 2px;
  background: rgba(0, 82, 204, .10) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230052cc' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center / 12px 12px no-repeat;
  border: 1.5px solid rgba(0, 82, 204, .3);
}
.gc-case-demo h3 { margin: 0 0 5px; font-size: 15.5px; font-weight: 700; color: var(--gcc-navy); }
.gc-case-demo p { margin: 0; font-size: 14px; line-height: 1.7; color: var(--gcc-ink); }
.gc-case-demo a { color: var(--gcc-blue); font-weight: 600; text-decoration: none;
  border-bottom: 1px solid rgba(0, 82, 204, .3); }
.gc-case-demo a:hover { border-bottom-color: var(--gcc-blue); }

/* ==================================================================
   11. RELATED CAPABILITIES
   ================================================================== */
.gc-case-related {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px;
}
@media (min-width: 840px) { .gc-case-related { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.gc-case-related li { display: flex; }
.gc-case-related a {
  position: relative; flex: 1; overflow: hidden;
  display: flex; flex-direction: column; gap: 7px;
  padding: 22px 18px 18px; background: var(--gcc-white);
  border: 1px solid var(--gcc-line); border-radius: var(--gcc-r);
  box-shadow: var(--gcc-sh); text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.gc-case-related a::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px; background: var(--gcc-grad);
  transform: scaleY(0); transform-origin: top; transition: transform .25s ease;
}
.gc-case-related a:hover {
  transform: translateY(-3px); box-shadow: var(--gcc-sh-hi); border-color: #cfdae9;
}
.gc-case-related a:hover::before { transform: scaleY(1); }
.gc-case-related__t {
  font-size: 15px; font-weight: 700; color: var(--gcc-navy); line-height: 1.35;
}
.gc-case-related__d { font-size: 13px; color: var(--gcc-muted); line-height: 1.6; }
.gc-case-related__go {
  margin-top: 8px; font-size: 13px; font-weight: 700; color: var(--gcc-blue);
  display: inline-flex; align-items: center; gap: 5px;
  transition: gap .18s ease;
}
.gc-case-related a:hover .gc-case-related__go { gap: 10px; }

/* ==================================================================
   12. FAQ
   ================================================================== */
.gc-case .faq-item {
  background: var(--gcc-white); border: 1px solid var(--gcc-line);
  border-radius: var(--gcc-r); margin-bottom: 10px; overflow: hidden;
  box-shadow: var(--gcc-sh); transition: box-shadow .2s ease, border-color .2s ease;
}
.gc-case .faq-item:hover { border-color: #cfdae9; box-shadow: var(--gcc-sh-hi); }
.gc-case .faq-q {
  padding: 17px 52px 17px 22px; font-size: 15.5px; font-weight: 650;
  color: var(--gcc-navy); cursor: pointer; position: relative; line-height: 1.55;
}
.gc-case .faq-a {
  padding: 0 22px 18px; font-size: 14.8px; line-height: 1.78; color: var(--gcc-ink);
}
.gc-case .faq-a strong { color: var(--gcc-navy); font-weight: 650; }

/* ==================================================================
   13. DISCLAIMER
   ================================================================== */
.gc-case-note {
  margin: 0; padding: 15px 18px 15px 20px; font-size: 13.2px; line-height: 1.7;
  color: #7a5f1e; background: var(--gcc-amber-bg);
  border: 1px solid var(--gcc-amber-line);
  border-left: 3px solid var(--gcc-amber); border-radius: var(--gcc-r-xs);
}
.gc-case-note a { color: var(--gcc-blue); font-weight: 600; }

/* ==================================================================
   14. CTA
   ================================================================== */
.gc-case-cta {
  position: relative; overflow: hidden; text-align: center;
  padding: clamp(44px, 6vw, 76px) clamp(18px, 4vw, 32px);
  background:
    radial-gradient(700px 260px at 50% 0%, #e8f1fc 0%, rgba(232,241,252,0) 65%),
    var(--gcc-soft);
  border-top: 1px solid var(--gcc-line);
}
.gc-case-cta__inner { position: relative; max-width: 700px; margin: 0 auto; }
.gc-case-cta h2 {
  margin: 0 0 14px; font-size: clamp(23px, 2.8vw, 32px);
  font-weight: 800; color: var(--gcc-navy); line-height: 1.22; letter-spacing: -.018em;
}
.gc-case-cta p {
  margin: 0 0 28px; font-size: 16px; color: var(--gcc-muted); line-height: 1.7;
}

/* ==================================================================
   15. RESPONSIVE / MOTION
   ================================================================== */
@media (max-width: 700px) {
  .gc-case-item { padding: 20px 18px 18px 66px; }
  .gc-case-item__num { left: 16px; top: 18px; width: 30px; height: 30px; font-size: 13px; }
  .gc-case-insp li { padding-left: 52px; }
  .gc-case-insp li::before { left: 16px; }
  .gc-case-insp li::after { left: 24px; }
  .gc-case-facts { gap: 10px; }
  .gc-case-specs { gap: 10px; }
  .gc-case-result__grid { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .gc-case-item, .gc-case-spec, .gc-case-insp li, .gc-case-demo li,
  .gc-case-related a, .gc-case-related a::before, .gc-case-toc, .gc-case-related__go {
    transition: none !important;
  }
  .gc-case-item:hover, .gc-case-spec:hover, .gc-case-demo li:hover,
  .gc-case-related a:hover { transform: none !important; }
}