/* ============================================================
   CASE STUDY — styles/case-study.css
   Portafolio Cristian Sanabria
   Hito 3 — Mayo 2026 (v2 — fixes aplicados)
   ============================================================ */

/* ------------------------------------------------------------
   HEADER MÍNIMO
   ------------------------------------------------------------ */
.cs-header {
   position: sticky;
   top: 0;
   z-index: 100;
   display: flex;
   align-items: center;
   justify-content: space-between;
   padding: var(--space-3) var(--space-6);
   background-color: var(--color-bg);
   border-bottom: 1px solid var(--color-border);
}

.cs-logo img {
   display: block;
   width: 32px;
   height: 32px;
}

.cs-back {
   display: flex;
   align-items: center;
   gap: var(--space-1);
   font-family: var(--font-body);
   font-size: 0.875rem;
   font-weight: 500;
   color: var(--color-text-muted);
   text-decoration: none;
   transition: color 0.2s ease;
}

.cs-back:hover {
   color: var(--color-text);
}

/* ------------------------------------------------------------
   MAIN WRAPPER
   ------------------------------------------------------------ */
.cs-main {
   max-width: 1200px;
   margin: 0 auto;
}

/* ------------------------------------------------------------
   LABEL REUTILIZABLE
   ------------------------------------------------------------ */
.cs-label {
   display: block;
   font-family: var(--font-body);
   font-size: 0.6875rem;
   font-weight: 700;
   letter-spacing: 0.12em;
   text-transform: uppercase;
   color: var(--color-text-muted);
   margin-bottom: var(--space-3);
}

/* ------------------------------------------------------------
   BLOQUE 1 — HERO
   ------------------------------------------------------------ */
.cs-hero {
   padding: var(--space-12) var(--space-6) 0;
}

/* FIX: meta en grid 2x2 en mobile, fila única en desktop */
.cs-hero__meta {
   display: flex;
   gap: var(--space-8);
   margin-bottom: var(--space-6);
   flex-wrap: wrap;
}

.cs-meta-item {
   display: flex;
   flex-direction: column;
   gap: 4px;
}

.cs-meta-label {
   font-family: var(--font-body);
   font-size: 0.6875rem;
   font-weight: 700;
   letter-spacing: 0.1em;
   text-transform: uppercase;
   color: var(--color-text-muted);
}

.cs-meta-value {
   font-family: var(--font-body);
   font-size: 0.9375rem;
   font-weight: 500;
   color: var(--color-text);
}

.cs-hero__headline {
   font-family: var(--font-display);
   font-size: clamp(2rem, 4.5vw, 3.5rem);
   font-weight: 800;
   line-height: 1.1;
   color: var(--color-text);
   max-width: 16ch;
   margin-bottom: var(--space-8);
}

/* Hero image — efecto cine */
.cs-hero__image-wrap {
   width: 100%;
   padding: 0 var(--space-6);
   margin: 0 calc(-1 * var(--space-6));
   box-sizing: content-box;
}

.cs-hero__image {
   width: 100%;
   height: auto;
   display: block;
   border-radius: 4px;
   object-fit: cover;
}

/* ------------------------------------------------------------
   BLOQUE 2 — OVERVIEW
   ------------------------------------------------------------ */
.cs-overview {
   padding: var(--space-16) var(--space-6);
   border-top: 1px solid var(--color-border);
}

.cs-overview__inner {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: var(--space-12);
   align-items: start;
}

.cs-overview__text {
   font-family: var(--font-body);
   font-size: 1.125rem;
   font-weight: 400;
   line-height: 1.6;
   color: var(--color-text);
   max-width: 52ch;
}

.cs-overview__metrics {
   display: flex;
   flex-direction: column;
   gap: var(--space-6);
}

.cs-metric {
   display: flex;
   flex-direction: column;
   gap: 6px;
}

.cs-metric__value {
   font-family: var(--font-display);
   font-size: 2.5rem;
   font-weight: 800;
   line-height: 1;
   color: var(--color-accent);
}

.cs-metric__label {
   font-family: var(--font-body);
   font-size: 0.875rem;
   font-weight: 400;
   color: var(--color-text-muted);
   line-height: 1.4;
}

/* ------------------------------------------------------------
   BLOQUE 3 — PROCESS
   ------------------------------------------------------------ */
.cs-process {
   padding: var(--space-16) var(--space-6);
   border-top: 1px solid var(--color-border);
}

/* FIX: reducir gap entre label PROCESS y primera decisión */
.cs-process__inner {
   display: flex;
   flex-direction: column;
   gap: var(--space-12);
}

.cs-decision {
   display: flex;
   flex-direction: column;
   gap: var(--space-4);
}

.cs-decision__header {
   display: flex;
   align-items: baseline;
   gap: var(--space-3);
}

.cs-decision__number {
   font-family: var(--font-display);
   font-size: 0.875rem;
   font-weight: 800;
   color: var(--color-accent);
   letter-spacing: 0.05em;
   flex-shrink: 0;
}

.cs-decision__title {
   font-family: var(--font-display);
   font-size: clamp(1.25rem, 2.5vw, 1.75rem);
   font-weight: 800;
   line-height: 1.15;
   color: var(--color-text);
}

.cs-decision__body {
   font-family: var(--font-body);
   font-size: 1rem;
   font-weight: 400;
   line-height: 1.65;
   color: var(--color-text-muted);
   max-width: 64ch;
}

/* FIX: caption encima de imagen + max-height para imágenes largas */
.cs-decision__image-wrap {
   display: flex;
   flex-direction: column;
   gap: var(--space-2);
   margin-top: var(--space-3);
}

.cs-caption {
   font-family: var(--font-body);
   font-size: 0.75rem;
   font-weight: 500;
   letter-spacing: 0.06em;
   text-transform: uppercase;
   color: var(--color-text-muted);
   order: -1;
   /* caption siempre encima */
}

/* FIX: max-height para imágenes de proceso muy largas */
.cs-decision__image {
   width: 100%;
   max-height: 720px;
   display: block;
   border-radius: 4px;
   border: 1px solid var(--color-border);
   object-fit: cover;
   object-position: top;
}

/* ------------------------------------------------------------
   BLOQUE 4 — RESULTS
   ------------------------------------------------------------ */

/* FIX: reducir padding superior de results */
.cs-results {
   padding: var(--space-12) var(--space-6) var(--space-16);
   border-top: 1px solid var(--color-border);
   background-color: var(--color-surface);
}

.cs-results__inner {
   display: flex;
   flex-direction: column;
   gap: var(--space-12);
}

.cs-results__metrics {
   display: grid;
   grid-template-columns: repeat(3, 1fr);
   gap: var(--space-8);
}

.cs-metric--large .cs-metric__value {
   font-size: clamp(2.5rem, 5vw, 4rem);
}

.cs-metric--large .cs-metric__label {
   font-size: 0.9375rem;
}

/* Mobile comparison side by side */
.cs-results__mobile {
   width: 100%;
}

.cs-mobile-compare {
   display: grid;
   grid-template-columns: 1fr 1fr;
   gap: var(--space-4);
}

.cs-mobile-compare__item {
   display: flex;
   flex-direction: column;
   gap: var(--space-2);
}

.cs-mobile-compare__image {
   width: 100%;
   height: auto;
   display: block;
   border-radius: 4px;
   border: 1px solid var(--color-border);
   object-fit: cover;
}

/* Key learning */
.cs-results__learning {
   padding-top: var(--space-8);
   border-top: 1px solid var(--color-border);
}

.cs-learning__text {
   font-family: var(--font-display);
   font-size: clamp(1.125rem, 2vw, 1.5rem);
   font-weight: 800;
   line-height: 1.3;
   color: var(--color-text);
   max-width: 48ch;
}

/* ------------------------------------------------------------
   NAVEGACIÓN SIGUIENTE CASE
   FIX: estado visual en reposo más claro
   ------------------------------------------------------------ */
.cs-nav-next {
   padding: var(--space-12) var(--space-6);
   border-top: 1px solid var(--color-border);
}

.cs-next-link {
   display: flex;
   align-items: center;
   gap: var(--space-4);
   text-decoration: none;
   padding: var(--space-6) 0;
   border-bottom: 1px solid var(--color-border);
   transition: gap 0.3s ease, background-color 0.2s ease;
}

.cs-next-link:hover {
   gap: var(--space-6);
}

.cs-next-link:hover .cs-next-link__title {
   text-decoration: underline;
   text-underline-offset: 4px;
}

.cs-next-link:hover svg {
   color: var(--color-accent);
   transform: translateX(4px);
}

.cs-next-link svg {
   flex-shrink: 0;
   color: var(--color-text-muted);
   transition: color 0.2s ease, transform 0.2s ease;
}

.cs-next-link__title {
   font-family: var(--font-display);
   font-size: clamp(1.5rem, 3vw, 2.5rem);
   font-weight: 800;
   color: var(--color-text);
   flex: 1;
}

.cs-next-link__tags {
   font-family: var(--font-body);
   font-size: 0.875rem;
   font-weight: 500;
   color: var(--color-text-muted);
}

/* ------------------------------------------------------------
   FOOTER
   ------------------------------------------------------------ */
.cs-footer {
   padding: var(--space-6);
   text-align: center;
   font-family: var(--font-body);
   font-size: 0.8125rem;
   color: var(--color-text-muted);
   border-top: 1px solid var(--color-border);
}

/* ============================================================
   RESPONSIVE — TABLET (769px – 1024px)
   ============================================================ */
@media (min-width: 769px) and (max-width: 1024px) {
   .cs-header {
      padding: var(--space-3) var(--space-4);
   }

   .cs-hero {
      padding: var(--space-8) var(--space-4) 0;
   }

   .cs-hero__meta {
      gap: var(--space-6);
   }

   .cs-overview,
   .cs-process,
   .cs-results,
   .cs-nav-next {
      padding-left: var(--space-4);
      padding-right: var(--space-4);
   }

   .cs-results__metrics {
      grid-template-columns: repeat(3, 1fr);
      gap: var(--space-4);
   }
}

/* ============================================================
   RESPONSIVE — MOBILE (< 768px)
   ============================================================ */
@media (max-width: 768px) {
   .cs-header {
      padding: var(--space-2) var(--space-3);
   }

   .cs-hero {
      padding: var(--space-8) var(--space-3) 0;
   }

   /* FIX: meta en grid 2x2 en mobile */
   .cs-hero__meta {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: var(--space-4) var(--space-6);
   }

   .cs-hero__image-wrap {
      padding: 0 var(--space-3);
      margin: 0 calc(-1 * var(--space-3));
   }

   .cs-overview {
      padding: var(--space-12) var(--space-3);
   }

   .cs-overview__inner {
      grid-template-columns: 1fr;
      gap: var(--space-8);
   }

   .cs-process {
      padding: var(--space-12) var(--space-3);
   }

   /* FIX: max-height más reducido en mobile */
   .cs-decision__image {
      max-height: 480px;
   }

   .cs-results {
      padding: var(--space-10) var(--space-3) var(--space-12);
   }

   .cs-results__metrics {
      grid-template-columns: 1fr;
      gap: var(--space-6);
   }

   .cs-mobile-compare {
      grid-template-columns: 1fr 1fr;
      gap: var(--space-3);
   }

   .cs-nav-next {
      padding: var(--space-8) var(--space-3);
   }

   .cs-next-link {
      flex-wrap: wrap;
      gap: var(--space-3);
   }

   .cs-next-link__tags {
      display: none;
   }

   .cs-footer {
      padding: var(--space-4) var(--space-3);
   }
}