/* ═══════════════════════════════════════════
   CASE STUDY PAGE STYLES
   ═══════════════════════════════════════════ */

.cs-page { background: var(--bg); }

/* ─── PROGRESS BAR ─────────────────────── */
.cs-progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(to right, var(--blue), var(--purple));
  z-index: 200;
  transition: width 0.1s linear;
}

/* ─── HERO VIDEO ─────────────────────── */
.cs-hero {
  position: relative;
  height: 90svh;
  min-height: 600px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.cs-video-wrap {
  position: absolute;
  inset: 0;
}
.cs-video {
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.5) saturate(0.75);
}
.cs-video-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(8,8,8,1) 0%, rgba(8,8,8,0.4) 40%, transparent 70%),
    linear-gradient(to right, rgba(8,8,8,0.6) 0%, transparent 60%);
}

.cs-hero-content {
  position: relative;
  z-index: 2;
  padding: 0 5% 5rem;
  max-width: 900px;
}

.cs-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--gray);
  margin-bottom: 1.5rem;
}
.cs-breadcrumb a { transition: color 0.2s; }
.cs-breadcrumb a:hover { color: var(--accent); }
.cs-breadcrumb span { opacity: 0.4; }
.cs-breadcrumb span:last-child { opacity: 1; color: var(--gray-lt); }

.cs-hero-tags {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.2rem;
  flex-wrap: wrap;
}

.cs-tag {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--gray-lt);
}
.cs-tag--blue {
  color: var(--blue);
  border-color: rgba(59,130,246,0.35);
  background: rgba(59,130,246,0.08);
}

.cs-hero-title {
  font-family: var(--font-display);
  font-size: clamp(4rem, 9vw, 8rem);
  line-height: 0.95;
  letter-spacing: 0.01em;
  color: var(--white);
  margin-bottom: 1.5rem;
}

.cs-hero-sub {
  font-size: 1.05rem;
  line-height: 1.75;
  color: rgba(255,255,255,0.7);
  max-width: 540px;
}

.cs-hero-scroll {
  position: absolute;
  bottom: 2.5rem; right: 5%;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
  z-index: 2;
}
.cs-hero-scroll span {
  font-family: var(--font-ui);
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray);
  writing-mode: vertical-lr;
  transform: rotate(180deg);
}
.cs-scroll-line {
  width: 1px; height: 50px;
  background: linear-gradient(to bottom, transparent, var(--accent));
  animation: scrollPulse 2s ease-in-out infinite;
}

/* ─── STATS BAR ──────────────────────── */
.cs-stats-bar {
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  padding: 1.8rem 5%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.cs-stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-align: center;
}
.cs-stat-label {
  font-family: var(--font-ui);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}
.cs-stat-val {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--white);
}
.cs-stat-divider {
  width: 1px; height: 36px;
  background: var(--border);
}

/* ─── BODY / SECTIONS ────────────────── */
.cs-body {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 5%;
}

.cs-section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border);
}
.cs-section--alt  { background: transparent; }

.cs-section-inner {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 4rem;
  align-items: start;
}

.cs-section-label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  position: sticky;
  top: 120px;
}
.cs-sec-num {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--accent);
  opacity: 0.5;
  line-height: 1;
}
.cs-sec-title {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gray);
}

.cs-section-content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: 0.02em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  color: var(--white);
}

.cs-section-content p {
  font-size: 1rem;
  line-height: 1.85;
  color: #aaa;
  margin-bottom: 1.2rem;
  max-width: 640px;
}
.cs-section-content p em {
  color: var(--white);
  font-style: italic;
}

/* goal blocks */
.cs-goal-blocks {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}
.cs-goal-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.8rem 1.5rem;
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.cs-goal-block:hover {
  border-color: rgba(59,130,246,0.25);
  transform: translateY(-4px);
}
.cs-goal-icon { font-size: 1.8rem; margin-bottom: 1rem; }
.cs-goal-block h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--white);
}
.cs-goal-block p {
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--gray);
  margin: 0;
}

/* role pills */
.cs-role-pills {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.cs-role-pills span {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(59,130,246,0.3);
  background: rgba(59,130,246,0.06);
  padding: 6px 14px;
  border-radius: 100px;
}

/* craft items */
.cs-craft-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 1rem;
}
.cs-craft-item {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.3s var(--ease);
}
.cs-craft-item:first-child { border-top: 1px solid var(--border); }
.cs-craft-item:hover { padding-left: 0.5rem; }

.cs-craft-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.7rem;
}
.cs-craft-num {
  font-family: var(--font-display);
  font-size: 1.8rem;
  color: var(--accent);
  opacity: 0.35;
  line-height: 1;
  transition: opacity 0.3s;
}
.cs-craft-item:hover .cs-craft-num { opacity: 0.8; }

.cs-craft-header h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--white);
}
.cs-craft-item p {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--gray);
  margin: 0 0 0.8rem;
  max-width: 600px;
}
.cs-craft-detail {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  opacity: 0.7;
}

/* challenges */
.cs-challenge-list { display: flex; flex-direction: column; gap: 1.2rem; margin-top: 1.5rem; }
.cs-challenge {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.cs-challenge:hover {
  border-color: rgba(59,130,246,0.2);
  transform: translateX(4px);
}
.cs-ch-icon { font-size: 1.2rem; flex-shrink: 0; padding-top: 2px; }
.cs-challenge h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.4rem; color: var(--white); }
.cs-challenge p { font-size: 0.85rem; line-height: 1.7; color: var(--gray); margin: 0; }

/* solution callout */
.cs-solution-callout {
  display: flex;
  gap: 1.5rem;
  align-items: stretch;
  background: rgba(59,130,246,0.05);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: 10px;
  padding: 1.5rem 1.8rem;
  margin-top: 1.5rem;
}
.cs-callout-bar {
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--blue), var(--purple));
  flex-shrink: 0;
}
.cs-solution-callout p {
  font-size: 1rem !important;
  font-style: italic;
  color: var(--gray-lt) !important;
  margin: 0 !important;
  line-height: 1.7 !important;
}

/* results */
.cs-results-grid {
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}
.cs-result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2rem;
  transition: border-color 0.3s, transform 0.3s var(--ease);
}
.cs-result-card:hover {
  border-color: rgba(59,130,246,0.25);
  transform: translateY(-4px);
}
.cs-result-num {
  display: block;
  font-family: var(--font-display);
  font-size: 3.5rem;
  line-height: 1;
  margin-bottom: 0.6rem;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.cs-result-num span { font-size: 2.5rem; }
.cs-result-card p { font-size: 0.85rem; line-height: 1.6; color: var(--gray); margin: 0; }

/* deliverables */
.cs-deliverables-list { display: flex; flex-direction: column; gap: 0; margin-top: 1rem; }
.cs-deliverable {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding-left 0.3s var(--ease);
}
.cs-deliverable:first-child { border-top: 1px solid var(--border); }
.cs-deliverable:hover { padding-left: 0.5rem; }

.cs-del-check {
  font-size: 1rem;
  color: var(--accent);
  flex-shrink: 0;
  padding-top: 3px;
}
.cs-deliverable h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.3rem; color: var(--white); }
.cs-deliverable p { font-size: 0.82rem; line-height: 1.6; color: var(--gray); margin: 0; }

/* ─── FRAMES ──────────────────────────── */
.cs-frame-full {
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 5%;
}
.cs-frame-full img {
  width: 100%;
  border-radius: 14px;
  aspect-ratio: 16/7;
  object-fit: cover;
  border: 1px solid var(--border);
}
.cs-frame-caption {
  font-family: var(--font-ui);
  font-size: 0.72rem;
  color: var(--gray);
  letter-spacing: 0.08em;
  margin-top: 0.8rem;
  text-align: center;
}

.cs-frames-grid {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 5%;
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 1rem;
}
.cs-frame {
  border-radius: 12px;
  overflow: hidden;
  position: relative;
}
.cs-frame img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: 12px;
  display: block;
  transition: transform 0.5s var(--ease);
}
.cs-frame:hover img { transform: scale(1.04); }
.cs-frame p {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  color: var(--gray);
  letter-spacing: 0.06em;
  margin-top: 0.5rem;
  text-align: center;
}

/* ─── NEXT PROJECT ───────────────────── */
.cs-next {
  padding: 6rem 5%;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  text-align: center;
}
.cs-next-inner {
  max-width: 700px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.cs-next-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: 0.02em;
  color: var(--white);
  transition: gap 0.3s;
}
.cs-next-link:hover { gap: 1.8rem; }
.cs-next-link .cs-next-arrow {
  color: var(--accent);
  transition: transform 0.3s;
}
.cs-next-link:hover .cs-next-arrow { transform: translateX(6px); }
.cs-next > div > p {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  color: var(--gray);
  letter-spacing: 0.1em;
}

/* ─── BACK BAR ───────────────────────── */
.cs-back-wrap {
  padding: 2rem 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
.cs-back-btn {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--gray);
  letter-spacing: 0.06em;
  transition: color 0.3s;
}
.cs-back-btn:hover { color: var(--white); }

/* ─── RESPONSIVE ─────────────────────── */
@media (max-width: 900px) {
  .cs-section-inner { grid-template-columns: 1fr; gap: 1.5rem; }
  .cs-section-label { position: static; flex-direction: row; align-items: center; gap: 0.8rem; }
  .cs-goal-blocks { grid-template-columns: 1fr; }
  .cs-results-grid { grid-template-columns: 1fr 1fr; }
  .cs-frames-grid { grid-template-columns: 1fr; }
  .cs-stats-bar { justify-content: flex-start; }
}

@media (max-width: 600px) {
  .cs-results-grid { grid-template-columns: 1fr; }
  .cs-back-wrap { flex-direction: column; gap: 1rem; text-align: center; }
}