/* Case study pages — shares tokens, nav, brand, plot and footer styles with ../style.css */

.case-page .nav { background: rgba(8, 14, 30, 0); }
.nav-back {
  margin-left: auto; display: inline-flex; align-items: center; gap: 8px;
  font-size: 14.5px; font-weight: 500; color: var(--on-night-2); transition: color .2s;
}
.nav-back:hover { color: #fff; }
.nav.scrolled .nav-back { color: var(--ink-2); }
.nav.scrolled .nav-back:hover { color: var(--ink); }
.nav-back svg { transition: transform .2s var(--ease); }
.nav-back:hover svg { transform: translateX(-3px); }

/* Header */
.case-hero {
  position: relative; overflow: hidden; isolation: isolate;
  background: var(--hero-bg); color: var(--on-night);
  padding: calc(var(--nav-h) + 64px) 0 56px;
}
.case-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(rgba(169,192,234,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169,192,234,.05) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(90deg, transparent 10%, #000 70%);
  -webkit-mask-image: linear-gradient(90deg, transparent 10%, #000 70%);
}
.case-hero::after {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(60% 90% at 90% 10%, rgba(90,128,200,.18), transparent 70%);
}
.case-hero-inner { display: grid; grid-template-columns: 1.35fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.case-tag { font: 500 12px/1.4 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--blue-3); margin-bottom: 22px; display: block; }
.case-hero h1 { font-size: clamp(34px, 4.2vw, 54px); line-height: 1.08; letter-spacing: -0.015em; margin-bottom: 0; }
.case-hero .case-fig {
  background: rgba(17, 27, 54, .6); border: 1px solid var(--night-line); border-radius: var(--radius);
  padding: 22px 20px 16px; aspect-ratio: auto;
}
.case-meta {
  grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--night-line); margin-top: 8px;
}
.meta-item { padding: 22px 24px 0 0; }
.meta-item + .meta-item { padding-left: 24px; border-left: 1px solid var(--night-line); }
.meta-label { font: 500 11px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--on-night-2); margin-bottom: 10px; }
.meta-value { font-size: 15.5px; color: var(--on-night); }

/* Body */
.case-body { max-width: 780px; margin: 0 auto; padding: clamp(56px, 8vw, 96px) var(--gutter) clamp(72px, 9vw, 120px); }
.metric-block {
  display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap;
  padding: 24px 0 26px; margin-bottom: 48px;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.metric-number { font-family: var(--serif); font-size: clamp(48px, 6vw, 64px); line-height: 1; color: var(--blue); letter-spacing: -0.02em; }
.metric-label { font-size: 15px; color: var(--muted); max-width: 24em; }

.case-body h2 { font-size: clamp(26px, 3vw, 32px); line-height: 1.2; margin: 56px 0 18px; }
.case-body h2:first-child { margin-top: 0; }
.case-body p { color: var(--ink-2); margin-bottom: 18px; }
.case-body p a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.case-body ul { margin: 0 0 18px; }
.case-body ul li { position: relative; padding: 0 0 12px 26px; color: var(--ink-2); }
.case-body ul li::before { content: ""; position: absolute; left: 4px; top: .72em; width: 8px; height: 1px; background: var(--blue); }

.case-media { margin: 36px 0; }
.case-media img, .case-media video {
  display: block; width: 100%; border-radius: var(--radius);
  border: 1px solid var(--line); background: var(--paper-2);
  box-shadow: 0 24px 48px -28px rgba(11,20,48,.35);
}
.case-media figcaption { font: 400 12px/1.6 var(--mono); color: var(--muted); margin-top: 14px; letter-spacing: .01em; }

.media-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  margin: 32px 0; padding: 56px 32px; text-align: center;
  border: 1px dashed #cfd6e4; border-radius: var(--radius); background: var(--paper-2);
}
.media-placeholder .ph-icon { display: none; }
.media-placeholder .ph-label { font: 400 12px var(--mono); color: var(--muted); letter-spacing: .04em; }

/* Next-step band */
.case-cta { background: var(--night); color: var(--on-night); padding: clamp(56px, 7vw, 88px) 0; }
.case-cta .wrap { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.case-cta h2 { font-size: clamp(26px, 3vw, 36px); max-width: 20ch; }
.case-cta .actions { display: flex; gap: 14px; flex-wrap: wrap; }

@media (max-width: 860px) {
  .case-hero-inner { grid-template-columns: 1fr; }
  .case-hero .case-fig { max-width: 520px; }
  .nav-back span { display: none; }
}
@media (max-width: 640px) {
  .case-meta { grid-template-columns: 1fr; }
  .meta-item, .meta-item + .meta-item { padding: 16px 0 0; border-left: 0; }
}

.metric-block + h2 { margin-top: 0; }
.case-body strong { color: var(--ink); font-weight: 600; }

/* Click-to-enlarge */
.case-media img { cursor: zoom-in; transition: box-shadow .25s var(--ease); }
.case-media img:hover { box-shadow: 0 28px 56px -26px rgba(11,20,48,.5); }
.lightbox {
  position: fixed; inset: 0; z-index: 200; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 14px; padding: 56px 24px 24px;
  background: rgba(6, 10, 22, 0.94); cursor: zoom-out;
  opacity: 0; pointer-events: none; transition: opacity .2s var(--ease);
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img {
  max-width: min(100%, 1800px); max-height: calc(100vh - 140px); width: auto; height: auto;
  border-radius: 8px; box-shadow: 0 30px 80px rgba(0,0,0,.5); cursor: default; background: #fff;
}
.lightbox-cap { font: 400 12.5px/1.6 var(--mono); color: var(--on-night-2); max-width: 80ch; text-align: center; }
.lightbox-close {
  position: absolute; top: 14px; right: 18px; width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid rgba(169,192,234,.3); background: transparent; color: var(--on-night);
  font-size: 24px; line-height: 1; cursor: pointer;
}
.lightbox-close:hover { border-color: var(--on-night); }

/* Physics / role-of-ML panel */
.physics-box {
  margin: -16px 0 48px; border: 1px solid var(--line); border-left: 3px solid var(--blue);
  border-radius: 0 var(--radius) var(--radius) 0; background: var(--paper-2);
}
.physics-box div { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 16px 22px; }
.physics-box div + div { border-top: 1px solid var(--line); }
.physics-box dt { font: 500 11.5px/1.9 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--blue); }
.physics-box dd { font-size: 15.5px; color: var(--ink-2); line-height: 1.6; }
@media (max-width: 640px) { .physics-box div { grid-template-columns: 1fr; gap: 4px; } }
.physics-box .phys-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; }
.physics-box .phys-list li { padding: 0 0 0 12px; border-left: 2px solid var(--line); line-height: 1.45; }
.physics-box .phys-list li::before { content: none; }
.physics-box .phys-list b { display: block; font-weight: 600; font-size: 14.5px; color: var(--ink); }
.physics-box .phys-list span { display: block; font-size: 14px; color: var(--muted); }
@media (max-width: 640px) { .physics-box .phys-list { grid-template-columns: 1fr; } }