/* =========================================================
   UNIVERSIDAD SERGIO ARBOLEDA — Case study page styles (usa-*)
   Follows DESIGN.md: purple-led palette, flat surfaces,
   airy spacing, restrained rounding, strong contrast.
   ========================================================= */

/* Override shared project layout for this page */
.pdf-hero { padding: var(--space-xl) 0 var(--space-sm); }
section.pdf-content { padding: var(--space-sm) 0 var(--space-xl); }
.pdf-content .container-narrow { max-width: 1100px; }

/* ── Section scaffold ──────────────────────────────────── */

.usa-section { margin-bottom: var(--space-xl); }
.usa-section:last-child { margin-bottom: 0; }

.usa-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-purple);
}

.usa-eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  border-radius: var(--radius-full);
  background: var(--gradient-brand-primary);
}

.usa-eyebrow--light { color: var(--color-mint); }
.usa-eyebrow--light::before { background: var(--color-mint); }

.usa-section-title {
  font-size: clamp(1.65rem, 3.4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--color-gray-900);
  margin: 0.55rem 0 1.1rem;
}

.usa-lead {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.8;
  color: var(--color-text-muted);
}

/* ── Cover band + fact strip ───────────────────────────── */

.usa-cover { margin-bottom: var(--space-xl); }

.usa-cover-banner {
  position: relative;
  overflow: hidden;
  background: var(--gradient-brand-deep);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2rem 3.25rem;
  text-align: center;
}

.usa-cover-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 84% 16%, rgba(250, 224, 25, 0.2), transparent 40%),
    radial-gradient(circle at 12% 88%, rgba(124, 250, 195, 0.12), transparent 44%),
    radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.06), transparent 62%);
  pointer-events: none;
}

.usa-cover-logo {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.6rem;
  background: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.usa-cover-logo img {
  display: block;
  max-width: 220px;
  max-height: 68px;
  object-fit: contain;
}

.usa-cover-title {
  position: relative;
  z-index: 1;
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--color-white);
  max-width: 24em;
  margin: 1.4rem auto 0;
}

.usa-cover-duration {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 1.5rem;
  padding: 0.45rem 1.2rem;
  border-radius: var(--radius-full);
  background: var(--color-yellow);
  color: var(--color-purple-darkest);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.usa-facts {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: -2rem 1.25rem 0;
  padding: 1.5rem 1rem;
  background: var(--surface);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

.usa-fact { padding: 0.4rem 1.1rem; }
.usa-fact + .usa-fact { border-left: 1px solid var(--color-gray-200); }

.usa-fact-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-soft);
  margin-bottom: 0.35rem;
}

.usa-fact-value {
  display: block;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--color-gray-900);
}

/* ── Hero image ────────────────────────────────────────── */

.usa-hero {
  margin: 0 0 var(--space-xl);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--color-gray-200);
}

.usa-hero img {
  display: block;
  width: 100%;
  height: auto;
}

/* ── Overview ──────────────────────────────────────────── */

.usa-overview-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 2.5rem;
  align-items: center;
  margin-top: 1.5rem;
}

.usa-overview-copy .usa-lead { margin-bottom: 1.1rem; }
.usa-overview-copy .usa-lead:last-child { margin-bottom: 0; }

.usa-overview-media {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-soft);
}

.usa-overview-media img {
  display: block;
  width: 100%;
  height: auto;
}

/* ── Challenge callout ─────────────────────────────────── */

.usa-challenge {
  position: relative;
  overflow: hidden;
  background: var(--surface-soft);
  border: 1px solid rgba(79, 46, 222, 0.14);
  border-radius: var(--radius-xl);
  padding: 2.75rem 2.5rem 2.75rem 3rem;
}

.usa-challenge::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 6px;
  background: var(--gradient-brand-primary);
}

.usa-challenge .usa-lead { max-width: 62em; }

.usa-challenge-list {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem 1.75rem;
  max-width: 58em;
}

.usa-challenge-item {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  font-size: 0.98rem;
  line-height: 1.55;
  color: var(--color-gray-700);
}

.usa-challenge-item svg {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 0.2rem;
  color: var(--color-purple);
}

/* ── Solutions ─────────────────────────────────────────── */

.usa-solutions-intro { max-width: 54em; }

.usa-solutions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.usa-solutions-grid--2 { grid-template-columns: repeat(2, 1fr); }

.usa-solution {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 1.75rem 1.75rem 1.9rem;
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.usa-solution::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-brand-primary);
}

.usa-solution:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow);
  border-color: rgba(79, 46, 222, 0.32);
}

.usa-solution-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.4rem;
}

.usa-solution-num {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--color-text-soft);
}

.usa-solution-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  color: var(--color-purple);
}

.usa-solution-icon svg { width: 22px; height: 22px; }

.usa-solution h3 {
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-gray-900);
  margin-bottom: 0.65rem;
}

.usa-solution p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  margin: 0;
}

/* Maintenance featured card */
.usa-solution--featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--color-purple) 0%, var(--color-purple-deep) 100%);
  border: none;
  box-shadow: var(--shadow);
}

.usa-solution--featured::before { display: none; }
.usa-solution--featured:hover { border: none; }
.usa-solution--featured .usa-solution-num { color: rgba(255, 255, 255, 0.55); }
.usa-solution--featured .usa-solution-icon { background: rgba(255, 255, 255, 0.14); color: var(--color-mint); }
.usa-solution--featured h3 { color: var(--color-white); }
.usa-solution--featured > p { color: rgba(255, 255, 255, 0.82); }

/* ── Technology stack ──────────────────────────────────── */

.usa-tech-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.usa-tech-card {
  padding: 1.5rem 1.25rem;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.usa-tech-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.usa-tech-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto 0.85rem;
  color: var(--color-purple);
}

.usa-tech-icon svg { width: 100%; height: 100%; }

.usa-tech-card h3 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: 0.25rem;
}

.usa-tech-card p {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-soft);
  margin: 0;
}

/* ── Results & Impact ──────────────────────────────────── */

.usa-results {
  position: relative;
  overflow: hidden;
  background: var(--gradient-brand-deep);
  border-radius: var(--radius-xl);
  padding: 3.5rem 2.75rem;
  color: var(--color-white);
}

.usa-results::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 86% 12%, rgba(124, 250, 195, 0.2), transparent 40%),
    radial-gradient(circle at 10% 92%, rgba(250, 224, 25, 0.14), transparent 40%);
  pointer-events: none;
}

.usa-results .usa-section-title { color: var(--color-white); }

.usa-results-copy {
  position: relative;
  display: grid;
  gap: 1.1rem;
  max-width: 64em;
}

.usa-results-copy p {
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.88);
  margin: 0;
}

.usa-hl {
  color: var(--color-mint);
  font-weight: 700;
}

/* ── Responsive ────────────────────────────────────────── */

@media (max-width: 900px) {
  .usa-solutions-grid,
  .usa-solutions-grid--2 { grid-template-columns: 1fr; }

  .usa-facts {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem 1.5rem;
    margin-left: 0.75rem;
    margin-right: 0.75rem;
  }

  .usa-fact { border-left: none; padding: 0.5rem 0; }

  .usa-overview-grid { grid-template-columns: 1fr; }

  .usa-challenge-list { grid-template-columns: 1fr; }

  .usa-tech-grid { grid-template-columns: repeat(2, 1fr); }

  .usa-challenge { padding: 2.25rem 1.75rem 2.25rem 2rem; }
  .usa-results { padding: 2.5rem 1.75rem; }
  .usa-cover-banner { padding: 2.75rem 1.25rem 2.5rem; }
}

@media (max-width: 480px) {
  .usa-facts { grid-template-columns: 1fr; }
  .usa-tech-grid { grid-template-columns: 1fr; }
}