/* ============================================================
   VektraScale Solutions — Case Studies Stylesheet
   File: static/css/case-studies.css
   Used by: case_studies_list.html, case_study_detail.html
   ============================================================ */

:root {
  --cs-bg:            #ffffff;
  --cs-bg-elev:       #fafaf9;
  --cs-card:          #ffffff;
  --cs-border:        rgba(15, 23, 42, 0.08);
  --cs-border-strong: rgba(15, 23, 42, 0.14);

  --cs-text:          #0b1220;
  --cs-text-soft:     #2b3445;
  --cs-text-muted:    #5b6473;
  --cs-text-faint:    #8a93a3;

  --cs-accent:        #4f46e5;
  --cs-accent-soft:   rgba(79, 70, 229, 0.08);
  --cs-accent-line:   rgba(79, 70, 229, 0.32);

  --cs-radius-sm: 6px;
  --cs-radius-md: 12px;
  --cs-radius-lg: 18px;

  --cs-page-max: 1200px;
  --cs-prose-max: 760px;
  --cs-pad-block: clamp(56px, 8vw, 96px);
  --cs-pad-inline: clamp(20px, 4vw, 40px);

  --cs-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --cs-shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06), 0 2px 6px rgba(15, 23, 42, 0.04);
  --cs-shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.05);
}

[data-theme="dark"] {
  --cs-bg:            #0a0c10;
  --cs-bg-elev:       #0f1218;
  --cs-card:          #11141b;
  --cs-border:        rgba(255, 255, 255, 0.08);
  --cs-border-strong: rgba(255, 255, 255, 0.14);

  --cs-text:          #f5f6f8;
  --cs-text-soft:     #d6d9e0;
  --cs-text-muted:    #9aa3b2;
  --cs-text-faint:    #6b7384;

  --cs-accent:        #818cf8;
  --cs-accent-soft:   rgba(129, 140, 248, 0.12);
  --cs-accent-line:   rgba(129, 140, 248, 0.40);

  --cs-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --cs-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
  --cs-shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55);
}

/* -------- Page shell -------- */
.cs-page {
  background: var(--cs-bg);
  color: var(--cs-text);
  font-family: "Manrope", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.cs-page * { box-sizing: border-box; }

/* -------- Hero (list page) -------- */
.cs-hero {
  padding: var(--cs-pad-block) var(--cs-pad-inline) clamp(32px, 5vw, 56px);
  background:
    radial-gradient(circle at 20% 0%, var(--cs-accent-soft) 0%, transparent 60%),
    var(--cs-bg);
  border-bottom: 1px solid var(--cs-border);
}
.cs-hero__inner {
  max-width: var(--cs-page-max);
  margin: 0 auto;
  text-align: center;
}
.cs-hero__eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cs-accent);
  font-weight: 600;
  margin-bottom: 16px;
  padding: 6px 14px;
  border: 1px solid var(--cs-accent-line);
  border-radius: 999px;
  background: var(--cs-accent-soft);
}
.cs-hero__title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
.cs-hero__lead {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--cs-text-soft);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.6;
}

/* -------- Grid section -------- */
.cs-grid-section {
  padding: clamp(48px, 6vw, 80px) var(--cs-pad-inline);
  background: var(--cs-bg);
}
.cs-grid-section__inner {
  max-width: var(--cs-page-max);
  margin: 0 auto;
}
.cs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: clamp(20px, 2.5vw, 32px);
}

/* -------- Card -------- */
.cs-card {
  display: flex;
  flex-direction: column;
  background: var(--cs-card);
  border: 1px solid var(--cs-border);
  border-radius: var(--cs-radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  box-shadow: var(--cs-shadow-sm);
}
.cs-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--cs-shadow-lg);
  border-color: var(--cs-border-strong);
}
.cs-card__media {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--cs-bg-elev);
}
.cs-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}
.cs-card:hover .cs-card__media img {
  transform: scale(1.04);
}
.cs-card__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--cs-accent);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border-radius: 999px;
  text-transform: uppercase;
}
.cs-card__body {
  padding: clamp(18px, 2vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}
.cs-card__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--cs-text-muted);
}
.cs-card__tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--cs-accent-soft);
  color: var(--cs-accent);
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}
.cs-card__client {
  color: var(--cs-text-faint);
}
.cs-card__title {
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.35;
  margin: 0;
  color: var(--cs-text);
  letter-spacing: -0.01em;
}
.cs-card__summary {
  font-size: 0.95rem;
  color: var(--cs-text-soft);
  line-height: 1.55;
  margin: 0;
  flex: 1;
}
.cs-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  color: var(--cs-accent);
  font-weight: 600;
  margin-top: 6px;
}
.cs-card__cta svg { transition: transform 0.25s ease; }
.cs-card:hover .cs-card__cta svg { transform: translateX(3px); }

/* -------- Empty state -------- */
.cs-empty {
  padding: clamp(48px, 8vw, 96px) 24px;
  text-align: center;
  border: 1px dashed var(--cs-border-strong);
  border-radius: var(--cs-radius-lg);
  background: var(--cs-bg-elev);
}
.cs-empty__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 12px;
}
.cs-empty__text {
  color: var(--cs-text-muted);
  margin: 0;
}
.cs-empty__text a { color: var(--cs-accent); }

/* -------- Detail page -------- */
.cs-breadcrumb {
  padding: 24px var(--cs-pad-inline) 0;
  border-bottom: 1px solid var(--cs-border);
  background: var(--cs-bg);
}
.cs-breadcrumb__inner {
  max-width: var(--cs-page-max);
  margin: 0 auto;
  font-size: 0.85rem;
  color: var(--cs-text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding-bottom: 16px;
}
.cs-breadcrumb__inner a {
  color: var(--cs-text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}
.cs-breadcrumb__inner a:hover { color: var(--cs-accent); }
.cs-breadcrumb__current { color: var(--cs-text); font-weight: 600; }

.cs-detail__header {
  padding: clamp(40px, 6vw, 72px) var(--cs-pad-inline) clamp(24px, 4vw, 40px);
  background: var(--cs-bg);
}
.cs-detail__header-inner {
  max-width: var(--cs-prose-max);
  margin: 0 auto;
  text-align: center;
}
.cs-detail__meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 18px;
  font-size: 0.88rem;
  color: var(--cs-text-muted);
}
.cs-detail__tag {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--cs-accent-soft);
  color: var(--cs-accent);
  font-weight: 600;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.cs-detail__client { color: var(--cs-text-faint); }
.cs-detail__title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.cs-detail__summary {
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  color: var(--cs-text-soft);
  line-height: 1.55;
  margin: 0;
}

.cs-detail__hero {
  margin: 0 auto;
  max-width: var(--cs-page-max);
  padding: 0 var(--cs-pad-inline);
}
.cs-detail__hero img {
  width: 100%;
  height: auto;
  border-radius: var(--cs-radius-lg);
  box-shadow: var(--cs-shadow-md);
  display: block;
}

/* -------- Metric strip -------- */
.cs-metrics {
  padding: clamp(32px, 5vw, 56px) var(--cs-pad-inline);
}
.cs-metrics__inner {
  max-width: var(--cs-page-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  background: var(--cs-bg-elev);
  border: 1px solid var(--cs-border);
  border-radius: var(--cs-radius-lg);
  padding: clamp(24px, 3vw, 40px);
}
.cs-metric { text-align: center; }
.cs-metric__value {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 800;
  color: var(--cs-accent);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.cs-metric__label {
  font-size: 0.85rem;
  color: var(--cs-text-muted);
  margin-top: 6px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

/* -------- Body / rich text -------- */
.cs-detail__body {
  padding: clamp(32px, 5vw, 64px) var(--cs-pad-inline) var(--cs-pad-block);
}
.cs-detail__body-inner {
  max-width: var(--cs-prose-max);
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--cs-text-soft);
}
.cs-detail__body-inner h2 {
  font-size: clamp(1.5rem, 2.5vw, 1.85rem);
  color: var(--cs-text);
  margin: 2.2em 0 0.6em;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.cs-detail__body-inner h3 {
  font-size: clamp(1.2rem, 2vw, 1.4rem);
  color: var(--cs-text);
  margin: 1.8em 0 0.5em;
  font-weight: 700;
}
.cs-detail__body-inner h2:first-child,
.cs-detail__body-inner h3:first-child { margin-top: 0; }
.cs-detail__body-inner p { margin: 0 0 1.2em; }
.cs-detail__body-inner ul,
.cs-detail__body-inner ol { margin: 0 0 1.2em; padding-left: 1.5em; }
.cs-detail__body-inner li { margin-bottom: 0.4em; }
.cs-detail__body-inner a {
  color: var(--cs-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.cs-detail__body-inner img {
  max-width: 100%;
  height: auto;
  border-radius: var(--cs-radius-md);
  margin: 1.5em 0;
  display: block;
}
.cs-detail__body-inner blockquote {
  border-left: 3px solid var(--cs-accent);
  padding: 0.4em 0 0.4em 1.2em;
  margin: 1.5em 0;
  color: var(--cs-text);
  font-style: italic;
  background: var(--cs-accent-soft);
  border-radius: 0 var(--cs-radius-sm) var(--cs-radius-sm) 0;
}
.cs-detail__body-inner code {
  background: var(--cs-bg-elev);
  border: 1px solid var(--cs-border);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 0.9em;
}
.cs-detail__body-inner pre {
  background: var(--cs-bg-elev);
  border: 1px solid var(--cs-border);
  border-radius: var(--cs-radius-md);
  padding: 16px 20px;
  overflow-x: auto;
  margin: 1.5em 0;
  font-size: 0.9em;
}
.cs-detail__body-inner pre code {
  background: none;
  border: none;
  padding: 0;
}
.cs-detail__body-inner table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.95em;
}
.cs-detail__body-inner th,
.cs-detail__body-inner td {
  border: 1px solid var(--cs-border);
  padding: 10px 14px;
  text-align: left;
}
.cs-detail__body-inner th {
  background: var(--cs-bg-elev);
  font-weight: 600;
  color: var(--cs-text);
}

/* -------- Related -------- */
.cs-related {
  padding: clamp(48px, 6vw, 80px) var(--cs-pad-inline);
  background: var(--cs-bg-elev);
  border-top: 1px solid var(--cs-border);
}
.cs-related__inner {
  max-width: var(--cs-page-max);
  margin: 0 auto;
}
.cs-related__title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  margin: 0 0 32px;
  text-align: center;
  letter-spacing: -0.01em;
}
.cs-grid--related { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* -------- CTA -------- */
.cs-cta {
  padding: clamp(48px, 6vw, 80px) var(--cs-pad-inline);
  background: var(--cs-bg);
  border-top: 1px solid var(--cs-border);
}
.cs-cta__inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}
.cs-cta__title {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.cs-cta__text {
  font-size: 1.05rem;
  color: var(--cs-text-muted);
  margin: 0 0 24px;
}
.cs-cta__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* Active nav state for case studies tab */
.nav__link.is-active {
  color: var(--cs-accent);
  font-weight: 600;
}