/* ============================================================
   CASE STUDY PAGE STYLES — Quiet Authority Design System
   Uses variables from style.css (Inter + JetBrains Mono, light theme)
   ============================================================ */

/* ---------- Case Study Hero ---------- */
.cs-hero {
  padding: 120px 0 80px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.cs-hero__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.cs-hero__content {
  position: relative;
  z-index: 2;
  max-width: 100%;
}

.cs-hero__visual {
  display: flex;
  justify-content: flex-end;
  position: relative;
  z-index: 2;
}

@media (max-width: 968px) {
  .cs-hero {
    padding: 100px 0 64px;
  }
  .cs-hero__grid {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  .cs-hero__visual {
    justify-content: center;
  }
  .cs-hero__actions {
    justify-content: center;
  }
}

.cs-hero__back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  color: var(--ink-4);
  text-decoration: none;
  margin-bottom: 32px;
  transition: var(--transition);
}
.cs-hero__back:hover {
  color: var(--accent);
}

.cs-hero__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.cs-hero h1 {
  margin-bottom: 20px;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
}

.cs-hero__description {
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--ink-3);
  margin-bottom: 32px;
  max-width: 640px;
}

.cs-hero__actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---------- Section Compact ---------- */
.section--compact {
  padding: 48px 0;
}

/* ---------- Quick Stats ---------- */
.cs-quick-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: -32px;
  position: relative;
  z-index: 3;
}

@media (max-width: 768px) {
  .cs-quick-stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .cs-quick-stats { grid-template-columns: 1fr; }
}

.cs-quick-stat {
  animation: fadeUp 0.6s ease both;
}
.cs-quick-stat:nth-child(1) { animation-delay: 0.1s; }
.cs-quick-stat:nth-child(2) { animation-delay: 0.2s; }
.cs-quick-stat:nth-child(3) { animation-delay: 0.3s; }
.cs-quick-stat:nth-child(4) { animation-delay: 0.4s; }

/* ---------- Metric Cards ---------- */
.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
}
.metric-card:hover {
  border-color: var(--line-2);
  box-shadow: var(--shadow);
}

.metric-value {
  font-family: 'Poppins', var(--font-sans);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  margin-bottom: 4px;
  color: var(--ink);
}
.metric-value--blue { color: var(--accent); }
.metric-value--green { color: #15803D; }
.metric-value--amber { color: #D97706; }
.metric-value--purple { color: #7C3AED; }

.metric-label {
  font-size: 0.78rem;
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.metric-change {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #15803D;
  margin-bottom: 4px;
}

/* ---------- Client Overview ---------- */
.cs-overview {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 800px) {
  .cs-overview { grid-template-columns: 1fr; }
}

.cs-overview__text h3 { margin-bottom: 12px; }
.cs-overview__text p {
  margin-bottom: 14px;
  font-size: 0.95rem;
  line-height: 1.75;
}

.cs-overview__sidebar .card {
  padding: 28px;
}

.cs-overview__detail {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.cs-overview__detail:last-child { border-bottom: none; }

.cs-overview__detail-label {
  font-size: 0.72rem;
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-4);
  margin-bottom: 4px;
}

.cs-overview__detail-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
}

/* ---------- Card (general) ---------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.card:hover {
  border-color: var(--line-2);
  box-shadow: var(--shadow);
}

/* ---------- Challenge Section ---------- */
.cs-challenge__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.challenge-card {
  padding: 28px;
}

.challenge-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: rgba(239, 68, 68, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-size: 1.3rem;
}

.challenge-card h4 {
  margin-bottom: 8px;
  color: var(--ink);
}

.challenge-card p {
  font-size: 0.88rem;
  color: var(--ink-3);
}

/* ---------- Strategy Section ---------- */
.strategy-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 24px;
  align-items: start;
  margin-bottom: 32px;
}

.strategy-step__number {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  background: var(--accent-soft);
  border: 1px solid rgba(79, 70, 229, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Poppins', var(--font-sans);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent);
  flex-shrink: 0;
}

.strategy-step h4 { margin-bottom: 8px; }
.strategy-step p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ink-3);
}

.strategy-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

/* ---------- Badges ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  font-size: 0.72rem;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(79, 70, 229, 0.15);
}
.badge--green {
  background: rgba(21, 128, 61, 0.08);
  color: #15803D;
  border-color: rgba(21, 128, 61, 0.15);
}
.badge--amber {
  background: rgba(217, 119, 6, 0.08);
  color: #D97706;
  border-color: rgba(217, 119, 6, 0.15);
}

/* ---------- Screenshots Gallery ---------- */
.cs-gallery {
  background: var(--bg-soft);
}

.gallery-grid {
  display: grid;
  gap: 24px;
}
.gallery-grid--2col { grid-template-columns: repeat(2, 1fr); }
.gallery-grid--1col {
  grid-template-columns: 1fr;
  max-width: 900px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .gallery-grid--2col { grid-template-columns: 1fr; }
}

.gallery-item__caption {
  margin-top: 12px;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  color: var(--ink-4);
  text-align: center;
}

/* Screenshot Frame */
.screenshot-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-card);
  box-shadow: var(--shadow);
}

.screenshot-frame__dots {
  display: flex;
  gap: 7px;
  padding: 10px 14px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}

.screenshot-frame__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line-2);
}
.screenshot-frame__dot--red { background: #ff5f57; }
.screenshot-frame__dot--yellow { background: #febc2e; }
.screenshot-frame__dot--green { background: #28c840; }

.screenshot-frame img {
  width: 100%;
  display: block;
  border: none;
  border-radius: 0;
}

/* ---------- Before/After Comparison ---------- */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 700px) {
  .comparison { grid-template-columns: 1fr; }
}

.comparison__side {
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
}
.comparison__side--before {
  background: var(--accent-soft);
  border: 1px solid rgba(79, 70, 229, 0.12);
}
.comparison__side--after {
  background: rgba(21, 128, 61, 0.04);
  border: 1px solid rgba(21, 128, 61, 0.12);
}

.comparison__badge {
  position: absolute;
  top: -12px;
  left: 24px;
  padding: 4px 14px;
  font-size: 0.7rem;
  font-family: var(--font-sans);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(79, 70, 229, 0.2);
}
.comparison__badge--after {
  background: rgba(21, 128, 61, 0.1);
  color: #15803D;
  border-color: rgba(21, 128, 61, 0.2);
}

.comparison__item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.comparison__item:last-child { border-bottom: none; }

.comparison__item-label {
  font-size: 0.9rem;
  color: var(--ink-3);
}
.comparison__item-value {
  font-family: 'Poppins', var(--font-sans);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
}

/* ---------- Results Section ---------- */
.results-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}

.result-metric {
  text-align: center;
  padding: 32px 20px;
}

.result-metric .metric-value {
  font-size: clamp(2.2rem, 5vw, 3rem);
  margin-bottom: 4px;
}

/* ---------- Label (section eyebrow) ---------- */
.label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 12px;
}

/* ---------- Text utilities ---------- */
.text-gradient {
  color: var(--accent);
  background: none;
  -webkit-text-fill-color: var(--accent);
}
.text-green { color: #15803D; }
.text-amber { color: #D97706; }
.text-accent { color: var(--accent); }
.text-muted { color: var(--ink-4); }

/* ---------- Container variants ---------- */
.container--wide { max-width: 1320px; }
.container--narrow { max-width: 820px; }

/* ---------- Dividers ---------- */
.divider {
  height: 1px;
  background: var(--line);
  border: none;
  margin: 48px 0;
}

/* ---------- Scroll Animations ---------- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}
.animate-on-scroll.delay-1 { transition-delay: 100ms; }
.animate-on-scroll.delay-2 { transition-delay: 200ms; }
.animate-on-scroll.delay-3 { transition-delay: 300ms; }
.animate-on-scroll.delay-4 { transition-delay: 400ms; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .cs-hero {
    padding: 80px 0 48px;
  }
  .cs-hero h1 { font-size: 2rem; }
  .strategy-step { grid-template-columns: 1fr; }
  .strategy-step__number {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
}

/* ---------- Case Study Testimonial ---------- */
.cs-testimonial {
  margin: 48px 0;
  border-left: 4px solid var(--accent);
  padding: 24px 32px;
  background: var(--bg-soft);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}
.cs-testimonial__quote {
  font-size: 1.15rem;
  line-height: 1.65;
  font-style: italic;
  color: var(--ink-2);
  margin-bottom: 12px;
}
.cs-testimonial__author {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
}