/* ============================================
   DESAFÍOS — challenge detail page
   Estructura reutilizable: cualquier desafío
   nuevo usa este CSS sin modificación.
   Pares con desafios.css (badge, sponsor img).
   ============================================ */

.challenge-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-muted-2);
  margin-bottom: 28px;
}
.challenge-breadcrumb a { color: var(--c-cyan); transition: color 0.2s var(--ease-out); }
.challenge-breadcrumb a:hover { color: var(--c-pink); }
.challenge-breadcrumb span[aria-hidden] { opacity: 0.5; }

/* ============================================
   HEADER del desafío
   ============================================ */
.challenge-header {
  padding-top: clamp(110px, 13vw, 160px);
  padding-bottom: clamp(40px, 5vw, 70px);
  background:
    radial-gradient(ellipse 60% 50% at 80% 0%, rgba(0, 229, 255, 0.07), transparent 70%),
    radial-gradient(ellipse 50% 40% at 0% 60%, rgba(234, 64, 118, 0.06), transparent 70%);
  position: relative;
}
.challenge-header::before {
  content: "";
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.3), transparent);
}

.challenge-header__sponsor {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}
.challenge-header__sponsor-label {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-muted-2);
  font-weight: 600;
}
.challenge-header__sponsor img {
  max-height: 56px;
  width: auto;
  filter: grayscale(1) brightness(2);
  opacity: 0.95;
}

.challenge-header__title-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 14px;
}
.challenge-header__title {
  font-family: var(--f-display);
  font-size: clamp(2.4rem, 5.4vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.04;
  margin: 0;
}
.challenge-header__slogan {
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  line-height: 1.5;
  color: var(--c-white);
  opacity: 0.9;
  max-width: 760px;
  margin-bottom: clamp(28px, 3vw, 40px);
  font-weight: 500;
}

/* Meta grid: Premio, Deadline, Formato — diseñado para crecer con futuros desafíos */
.challenge-header__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
  max-width: 720px;
  padding: clamp(20px, 2.4vw, 28px) clamp(22px, 2.6vw, 30px);
  background: rgba(18, 18, 18, 0.6);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  margin-bottom: clamp(28px, 3vw, 36px);
}
.challenge-header__meta-item { display: flex; flex-direction: column; gap: 4px; }
.challenge-header__meta-label {
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted-2);
  font-weight: 600;
}
.challenge-header__meta-value {
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: -0.005em;
}

.challenge-header__ctas { display: flex; gap: 14px; flex-wrap: wrap; }

@media (max-width: 640px) {
  .challenge-header__meta { grid-template-columns: 1fr; }
}

/* ============================================
   OVERVIEW
   ============================================ */
.challenge-overview { padding-top: clamp(50px, 6vw, 80px); padding-bottom: clamp(50px, 6vw, 80px); }
.challenge-overview__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
  max-width: 1080px;
  margin: 0 auto;
}
.challenge-overview__body h2 {
  font-family: var(--f-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 10px 0 18px;
}
.challenge-overview__body p {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--c-muted);
  margin-bottom: 14px;
}

.challenge-overview__topics {
  padding: 24px 24px 22px;
  background: rgba(18, 18, 18, 0.6);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.challenge-overview__topics-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
  font-weight: 600;
  margin-bottom: 14px;
}
.challenge-overview__topics ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.challenge-overview__topics li {
  padding: 7px 13px;
  background: rgba(0, 229, 255, 0.05);
  border: 1px solid var(--c-line-strong);
  border-radius: 999px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--c-white);
  transition: border-color 0.25s var(--ease-out), background 0.25s var(--ease-out);
}
.challenge-overview__topics li:hover {
  border-color: var(--c-cyan);
  background: rgba(0, 229, 255, 0.1);
}

@media (max-width: 880px) {
  .challenge-overview__grid { grid-template-columns: 1fr; }
}

/* ============================================
   AI CREATION REQUIREMENT — bloque destacado
   ============================================ */
.challenge-ai-req {
  padding-top: clamp(20px, 3vw, 40px);
  padding-bottom: clamp(50px, 6vw, 80px);
}
.challenge-ai-req__card {
  max-width: 1000px;
  margin: 0 auto;
  padding: clamp(32px, 4.5vw, 52px) clamp(28px, 4vw, 48px);
  background:
    linear-gradient(135deg, rgba(0, 229, 255, 0.12), transparent 65%),
    rgba(18, 18, 18, 0.78);
  border: 1px solid rgba(0, 229, 255, 0.32);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 80px -40px rgba(0, 229, 255, 0.4);
}
.challenge-ai-req__card::before {
  content: "";
  position: absolute;
  top: 0; left: 6%; right: 6%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), transparent);
}
.challenge-ai-req__head { margin-bottom: 20px; }
.challenge-ai-req__tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
  background: var(--c-cyan-soft);
  border: 1px solid rgba(0, 229, 255, 0.35);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.challenge-ai-req__head h2 {
  font-family: var(--f-display);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
}
.challenge-ai-req__lede {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--c-muted);
  margin-bottom: 26px;
  max-width: 800px;
}

.challenge-ai-req__uses { margin-bottom: 24px; }
.challenge-ai-req__uses-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-cyan);
  font-weight: 600;
  margin-bottom: 14px;
}
.challenge-ai-req__uses ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px 14px;
}
.challenge-ai-req__uses li {
  position: relative;
  padding-left: 22px;
  font-size: 14px;
  color: var(--c-white);
  font-weight: 500;
}
.challenge-ai-req__uses li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 12px; height: 7px;
  border-left: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(-45deg);
}

.challenge-ai-req__warning {
  padding: 16px 18px;
  background: rgba(234, 64, 118, 0.06);
  border-left: 3px solid var(--c-pink);
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-white);
}
.challenge-ai-req__warning strong { color: var(--c-pink); }

/* ============================================
   FULL BRIEF — 6 secciones en grid
   ============================================ */
.challenge-brief { padding-top: clamp(40px, 5vw, 70px); padding-bottom: clamp(50px, 6vw, 80px); }
.challenge-brief__head { text-align: center; margin-bottom: clamp(36px, 4vw, 56px); max-width: 720px; margin-inline: auto; }
.challenge-brief__head .section__title {
  font-size: clamp(1.8rem, 3.2vw, 2.4rem);
}

.challenge-brief__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: clamp(18px, 2.4vw, 28px);
  max-width: 1180px;
  margin: 0 auto;
}

.brief-section {
  position: relative;
  padding: 28px 26px;
  background: rgba(18, 18, 18, 0.65);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  isolation: isolate;
  transition:
    transform 0.32s var(--ease-out),
    border-color 0.32s var(--ease-out),
    box-shadow 0.32s var(--ease-out);
}
.brief-section:hover {
  transform: translateY(-3px);
  border-color: var(--c-cyan);
  box-shadow: 0 18px 40px -20px rgba(0, 229, 255, 0.3);
}
.brief-section__num {
  display: inline-block;
  font-family: var(--f-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--c-cyan);
  margin-bottom: 12px;
}
.brief-section h3 {
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--c-white);
}
.brief-section p { font-size: 14.5px; line-height: 1.65; color: var(--c-muted); }
.brief-section ul, .brief-section ol {
  margin-top: 4px;
  padding-left: 0;
  list-style: none;
}
.brief-section ul li,
.brief-section ol li {
  position: relative;
  padding: 6px 0 6px 24px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-muted);
}
.brief-section ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 14px;
  width: 12px; height: 7px;
  border-left: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(-45deg);
}
.brief-section ol { counter-reset: brief-step; }
.brief-section ol li::before {
  counter-increment: brief-step;
  content: counter(brief-step);
  position: absolute;
  left: 0; top: 6px;
  width: 16px;
  font-size: 12px;
  font-weight: 700;
  color: var(--c-cyan);
}
.brief-section li strong { color: var(--c-white); font-weight: 600; }

/* ============================================
   CTA FINAL
   ============================================ */
.challenge-final-cta { padding-top: clamp(20px, 3vw, 40px); padding-bottom: clamp(70px, 9vw, 130px); }
.challenge-final-cta__card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
  max-width: 1000px;
  margin: 0 auto;
  padding: clamp(36px, 5vw, 56px);
  background:
    linear-gradient(135deg, rgba(0, 229, 255, 0.10), transparent 60%),
    rgba(18, 18, 18, 0.78);
  border: 1px solid rgba(0, 229, 255, 0.28);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  position: relative;
  overflow: hidden;
}
.challenge-final-cta__card::before {
  content: "";
  position: absolute;
  top: 0; left: 8%; right: 8%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-cyan), transparent);
}
.challenge-final-cta__body h2 {
  font-family: var(--f-display);
  font-size: clamp(1.5rem, 2.8vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 10px 0 12px;
}
.challenge-final-cta__body p { color: var(--c-muted); font-size: 15px; line-height: 1.6; max-width: 540px; }
.challenge-final-cta__actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }

@media (max-width: 760px) {
  .challenge-final-cta__card { grid-template-columns: 1fr; }
  .challenge-final-cta__actions { justify-content: flex-start; }
}