/* =========================================================================
   Elegensoft — Case Studies Page Styles (Modular Dedicated Stylesheet)
   Brand Tokens: --primary (#FF6200), --secondary (#151432)
   Design System: Apple Human Interface Guidelines (HIG 2026)
   Centralized, Balanced Layout Matching Homepage Design
   ========================================================================= */

/* ─── Hero Section (Centered Layout Matching Homepage) ─────────────────── */

.cs-hero {
  padding: calc(var(--header-height) + var(--header-offset-top) + var(--safe-top) + 40px) 0 48px;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 70%, #f4f6fa 100%);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid rgba(21, 20, 50, 0.06);
}

/* Subtle ambient backdrop glow */
.cs-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 720px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 98, 0, 0.07) 0%, rgba(21, 20, 50, 0.03) 50%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.cs-hero .container {
  position: relative;
  z-index: 1;
}

/* Centered Hero Header */
.cs-hero-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 36px;
}

.cs-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--primary, #FF6200);
  background: var(--primary-subtle, #fff4ed);
  border: 1px solid rgba(255, 98, 0, 0.2);
  border-radius: var(--radius-pill, 9999px);
  margin-bottom: 16px;
  letter-spacing: 0.2px;
}

.cs-hero-title {
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 800;
  color: var(--text-dark, #151432);
  letter-spacing: -1.5px;
  line-height: 1.14;
  margin-bottom: 16px;
}

.cs-hero-desc {
  font-size: 16px;
  font-weight: 400;
  color: var(--text-body, #3c3b58);
  line-height: 1.65;
  max-width: 620px;
  margin: 0 auto;
}

/* ─── Client Logo Marquee (Centered) ────────────────────────────────────── */

.cs-marquee-container {
  position: relative;
  overflow: hidden;
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 14%, black 86%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 14%, black 86%, transparent 100%);
  padding: 12px 0;
}

.cs-marquee-track {
  display: flex;
  width: max-content;
  animation: csMarqueeGlide 28s linear infinite;
  will-change: transform;
}

.cs-marquee-container:hover .cs-marquee-track {
  animation-play-state: paused;
}

.cs-marquee-group {
  display: flex;
  align-items: center;
  gap: 36px;
  padding-right: 36px;
}

.cs-brand-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.cs-brand-item img {
  height: 22px;
  width: auto;
  opacity: 0.6;
  filter: grayscale(100%);
  transition: all 250ms cubic-bezier(0.23, 1, 0.32, 1);
}

.cs-brand-item:hover img {
  opacity: 1;
  filter: grayscale(0%);
  transform: scale(1.06);
}

.cs-brand-text {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
  opacity: 0.75;
  white-space: nowrap;
  transition: all 250ms ease;
  user-select: none;
}

.cs-brand-amtel {
  color: #dc2626;
  font-weight: 800;
}

.cs-brand-klikit {
  color: #7c3aed;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.cs-brand-azerion {
  color: #0284c7;
  font-weight: 700;
}

.cs-brand-cenexel {
  color: #0891b2;
  font-weight: 700;
}

.cs-brand-item:hover .cs-brand-text {
  opacity: 1;
  transform: scale(1.06);
}

@keyframes csMarqueeGlide {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}


/* ─── Case Study Cards Grid Section (Luminous & Centralized) ─────────────── */

.cs-grid-section {
  padding: 64px 0 96px;
  background: #fbfbfe;
  min-height: 600px;
  position: relative;
}

/* ─── Centered Category Filter Tabs (Apple HIG Pill System) ──────────────── */

.cs-filter-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0 auto 40px;
  flex-wrap: wrap;
}

.cs-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-body, #3c3b58);
  background: #ffffff;
  border: 1px solid rgba(21, 20, 50, 0.08);
  border-radius: var(--radius-pill, 9999px);
  cursor: pointer;
  transition: all 220ms cubic-bezier(0.23, 1, 0.32, 1);
  box-shadow: 0 2px 8px -1px rgba(21, 20, 50, 0.03);
}

.cs-tab-btn:hover {
  background: #f4f6fb;
  color: var(--text-dark, #151432);
  border-color: rgba(21, 20, 50, 0.14);
}

.cs-tab-btn.active {
  background: var(--primary, #FF6200);
  color: #ffffff;
  border-color: var(--primary, #FF6200);
  box-shadow: 0 4px 14px rgba(255, 98, 0, 0.28);
}

.cs-tab-btn:active {
  transform: scale(0.97);
}

/* ─── 3-Column Responsive Grid (Apple HIG Balanced Proportions) (Apple HIG Balanced Proportions) ─────────── */

.cs-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

/* ─── Premium Squircle Case Study Card ───────────────────────────────────── */

.cs-card {
  background: #ffffff;
  border-radius: var(--radius-xl, 24px);
  border: 1px solid rgba(21, 20, 50, 0.08);
  box-shadow: 0 4px 20px -2px rgba(21, 20, 50, 0.05), 0 2px 6px -1px rgba(21, 20, 50, 0.03);
  overflow: hidden;
  transition: 
    transform 320ms cubic-bezier(0.23, 1, 0.32, 1),
    box-shadow 320ms cubic-bezier(0.23, 1, 0.32, 1),
    border-color 250ms ease;
  display: flex;
  flex-direction: column;
}

.cs-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 98, 0, 0.28);
  box-shadow: 
    0 20px 42px -8px rgba(21, 20, 50, 0.10),
    0 8px 16px -4px rgba(255, 98, 0, 0.06);
}

.cs-card-link {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: inherit;
  padding: 24px;
  border-radius: inherit;
}

.cs-card-link:focus-visible {
  outline: 2px solid var(--primary, #FF6200);
  outline-offset: 4px;
}

/* Card Thumbnail */
.cs-card-thumb {
  position: relative;
  width: 100%;
  height: 210px;
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 20px;
  background: #f1f4f9;
}

.cs-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 16px;
  transition: transform 450ms cubic-bezier(0.23, 1, 0.32, 1);
}

.cs-card:hover .cs-card-thumb img {
  transform: scale(1.05);
}

/* Card Body */
.cs-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.cs-card-company {
  display: inline-block;
  font-size: 13.5px;
  font-weight: 600;
  color: #64748b;
  margin-bottom: 10px;
  letter-spacing: 0.1px;
}

.cs-card-title {
  font-size: clamp(19px, 2.2vw, 22px);
  font-weight: 700;
  color: var(--text-dark, #151432);
  letter-spacing: -0.6px;
  line-height: 1.35;
  margin-bottom: 14px;
  transition: color 200ms ease;
}

.cs-card:hover .cs-card-title {
  color: var(--primary, #FF6200);
}

/* Category Tags */
.cs-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.cs-tag {
  display: inline-block;
  padding: 5px 12px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.2px;
  border-radius: var(--radius-pill, 9999px);
  text-transform: capitalize;
}

.cs-tag.tag-ai {
  background: #f5f3ff;
  color: #7c3aed;
  border: 1px solid rgba(124, 58, 237, 0.15);
}

.cs-tag.tag-fintech {
  background: #fffbeb;
  color: #d97706;
  border: 1px solid rgba(217, 119, 6, 0.15);
}

.cs-tag.tag-cloud {
  background: #f0f9ff;
  color: #0284c7;
  border: 1px solid rgba(2, 132, 199, 0.15);
}

.cs-tag.tag-ecommerce {
  background: #ecfdf5;
  color: #059669;
  border: 1px solid rgba(5, 150, 105, 0.15);
}

.cs-tag.tag-special {
  background: #fff1f2;
  color: #e11d48;
  border: 1px solid rgba(225, 29, 72, 0.15);
}

/* Impact Metrics Strip */
.cs-card-metrics {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background: #f8fafc;
  border: 1px solid rgba(21, 20, 50, 0.06);
  border-radius: 12px;
  margin-bottom: 18px;
}

.cs-metric-item {
  display: flex;
  flex-direction: column;
}

.cs-metric-value {
  font-size: 17px;
  font-weight: 800;
  color: var(--text-dark, #151432);
  letter-spacing: -0.4px;
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
}

.cs-metric-label {
  font-size: 11.5px;
  color: #64748b;
  font-weight: 500;
  line-height: 1.3;
}

.cs-metric-divider {
  width: 1px;
  height: 28px;
  background: rgba(21, 20, 50, 0.1);
}

/* Card Action Link */
.cs-card-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary, #FF6200);
  transition: transform 200ms ease;
}

.cs-card-action svg {
  transition: transform 200ms ease;
}

.cs-card:hover .cs-card-action svg {
  transform: translateX(4px);
}


/* ─── Centered Pagination (Apple 44pt Touch Targets) ─────────────────────── */

.cs-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 56px;
}

.cs-page-num,
.cs-page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-body, #3c3b58);
  background: #ffffff;
  border: 1px solid rgba(21, 20, 50, 0.08);
  text-decoration: none;
  transition: all 220ms cubic-bezier(0.23, 1, 0.32, 1);
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
  box-shadow: 0 2px 6px -1px rgba(21, 20, 50, 0.03);
}

.cs-page-num:hover,
.cs-page-btn:hover:not(.disabled) {
  color: var(--text-dark, #151432);
  background: #f4f6fb;
  border-color: rgba(21, 20, 50, 0.16);
}

.cs-page-num.active {
  background: var(--primary, #FF6200);
  color: #ffffff;
  border-color: var(--primary, #FF6200);
  box-shadow: 0 4px 14px rgba(255, 98, 0, 0.3);
}

.cs-page-num:active,
.cs-page-btn:active {
  transform: scale(0.97);
}

.cs-page-btn.disabled {
  opacity: 0.35;
  pointer-events: none;
  background: #f8fafc;
}


/* ─── Responsive Media Queries ───────────────────────────────────────────── */

@media (max-width: 1024px) {
  .cs-hero {
    padding: calc(var(--header-height) + var(--header-offset-top) + var(--safe-top) + 32px) 0 40px;
  }

  .cs-cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .cs-hero-title {
    font-size: clamp(28px, 6vw, 36px);
  }

  .cs-hero-desc {
    font-size: 15px;
  }

  .cs-cards-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .cs-card-thumb {
    height: 210px;
  }

  .cs-filter-tabs {
    gap: 8px;
    margin-bottom: 32px;
  }

  .cs-tab-btn {
    min-height: 40px;
    padding: 8px 16px;
    font-size: 13px;
  }

  .cs-card-metrics {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .cs-metric-divider {
    display: none;
  }
}

/* ─── Reduced Motion ─────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .cs-marquee-track {
    animation: none;
  }

  .cs-card {
    transition: none;
  }

  .cs-card:hover {
    transform: none;
  }

  .cs-card-thumb img {
    transition: none;
  }

  .cs-card:hover .cs-card-thumb img {
    transform: none;
  }
}

/* =========================================================================
   Single Case Study Detail View (.csd-*)
   Apple HIG & Elegensoft Design System Matching
   ========================================================================= */

.csd-view {
  min-height: 80vh;
  padding: calc(var(--header-height) + var(--header-offset-top) + var(--safe-top) + 40px) 0 90px;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 40%, #f4f6fa 100%);
  position: relative;
}

.csd-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.csd-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--secondary-muted, #71708a);
  margin-bottom: 24px;
}

.csd-breadcrumb a {
  color: var(--secondary-muted, #71708a);
  text-decoration: none;
  transition: color 0.18s ease;
}

.csd-breadcrumb a:hover {
  color: var(--primary, #FF6200);
}

.csd-header {
  margin-bottom: 36px;
}

.csd-meta-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.csd-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #fff4ed;
  color: var(--primary, #FF6200);
  font-size: 12.5px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 9999px;
  border: 1px solid rgba(255, 98, 0, 0.2);
}

.csd-client {
  font-size: 14px;
  font-weight: 600;
  color: var(--secondary-muted, #71708a);
}

.csd-title {
  font-size: clamp(30px, 4.5vw, 48px);
  font-weight: 800;
  color: var(--secondary, #151432);
  letter-spacing: -1.2px;
  line-height: 1.18;
  margin-bottom: 16px;
}

.csd-summary {
  font-size: clamp(16px, 1.8vw, 18px);
  color: var(--text-body, #3c3b58);
  line-height: 1.65;
  max-width: 860px;
}

.csd-hero-media {
  width: 100%;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(21, 20, 50, 0.08);
  box-shadow: 0 20px 48px -12px rgba(21, 20, 50, 0.12);
  margin-bottom: 48px;
  background: #f1f3f7;
}

.csd-hero-media img {
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
  display: block;
}

.csd-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.csd-stat-card {
  background: #ffffff;
  border: 1px solid rgba(21, 20, 50, 0.08);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  box-shadow: 0 4px 16px -2px rgba(21, 20, 50, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.csd-stat-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 24px -4px rgba(21, 20, 50, 0.08);
}

.csd-stat-val {
  font-size: 36px;
  font-weight: 800;
  color: var(--primary, #FF6200);
  letter-spacing: -1px;
  margin-bottom: 6px;
}

.csd-stat-lbl {
  font-size: 13.5px;
  color: var(--secondary-muted, #71708a);
  font-weight: 600;
}

.csd-content-card {
  background: #ffffff;
  border: 1px solid rgba(21, 20, 50, 0.08);
  border-radius: 20px;
  padding: 40px;
  margin-bottom: 40px;
  box-shadow: 0 4px 20px rgba(21, 20, 50, 0.03);
}

.csd-section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--secondary, #151432);
  letter-spacing: -0.4px;
  margin-top: 32px;
  margin-bottom: 14px;
}

.csd-section-title:first-child {
  margin-top: 0;
}

.csd-text {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--text-body, #3c3b58);
  margin-bottom: 24px;
}

/* Editorial Gutenberg Content Formatting */
.csd-editorial-content {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-body, #3c3b58);
}

.csd-editorial-content h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--secondary, #151432);
  margin-top: 36px;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.csd-editorial-content h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--secondary, #151432);
  margin-top: 28px;
  margin-bottom: 12px;
}

.csd-editorial-content p {
  margin-bottom: 20px;
}

.csd-editorial-content ul,
.csd-editorial-content ol {
  margin: 16px 0 24px 24px;
  padding: 0;
}

.csd-editorial-content li {
  margin-bottom: 8px;
  line-height: 1.7;
}

.csd-editorial-content blockquote {
  margin: 28px 0;
  padding: 20px 24px;
  border-left: 4px solid var(--primary, #FF6200);
  background: #fdf8f4;
  border-radius: 0 12px 12px 0;
  font-style: italic;
  color: var(--secondary, #151432);
}

.csd-editorial-content code {
  background: #f1f3f7;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--secondary, #151432);
}

.csd-editorial-content pre {
  background: #151432;
  color: #f8fafc;
  padding: 20px;
  border-radius: 12px;
  overflow-x: auto;
  margin: 24px 0;
}

.csd-editorial-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.csd-editorial-content img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 24px 0;
}

.csd-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.csd-tech-pill {
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  background: #f8f8fc;
  border: 1px solid rgba(21, 20, 50, 0.08);
  border-radius: 9999px;
  color: var(--secondary, #151432);
}

.csd-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid rgba(21, 20, 50, 0.08);
}

.csd-btn-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 9999px;
  background: #f8f8fc;
  border: 1px solid rgba(21, 20, 50, 0.1);
  color: var(--secondary, #151432);
  font-weight: 600;
  font-size: 14.5px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.csd-btn-back:hover {
  background: #ffffff;
  color: var(--primary, #FF6200);
  border-color: var(--primary, #FF6200);
  transform: translateX(-3px);
}

.csd-btn-talk {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 9999px;
  background: var(--primary, #FF6200);
  color: #ffffff;
  font-weight: 700;
  font-size: 14.5px;
  text-decoration: none;
  box-shadow: 0 6px 20px var(--primary-glow, rgba(255, 98, 0, 0.35));
  transition: all 0.2s ease;
}

.csd-btn-talk:hover {
  background: var(--primary-hover, #e05600);
  transform: scale(1.03);
}

@media (max-width: 768px) {
  .csd-stats-grid {
    grid-template-columns: 1fr;
  }
  .csd-content-card {
    padding: 24px 20px;
  }
  .csd-actions-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .csd-btn-back,
  .csd-btn-talk {
    justify-content: center;
  }
}