/* ============================================
   CASE STUDY — Shared Styles
   Matches main portfolio design system
   ============================================ */

:root {
  --color-800: #0a0a0a;
  --color-700: #141414;
  --color-600: #8a8883;
  --color-500: #605e5b;
  --color-400: #3a3836;
  --color-200: #e0dcd4;
  --primary: #cf4b4b;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { color-scheme: dark; scroll-behavior: smooth; }

body {
  background: var(--color-800);
  color: var(--color-200);
  font-family: 'Akshar', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ============================================
   NAV
   ============================================ */
.cs-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.cs-back {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--color-600);
  text-transform: uppercase;
  transition: color 0.2s ease;
}
.cs-back:hover { color: var(--color-200); }
.cs-back svg { flex-shrink: 0; }

.cs-nav-logo svg {
  width: 28px; height: auto;
}

.cs-nav-cta {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-600);
  transition: color 0.2s ease;
}
.cs-nav-cta:hover { color: var(--primary); }

/* ============================================
   HERO
   ============================================ */
.cs-hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 120px 64px 72px;
  position: relative;
  overflow: hidden;
}

.cs-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(10,10,10,0.7) 0%, transparent 60%);
  pointer-events: none;
}

.cs-hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.cs-hero-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.cs-chip {
  font-size: 10px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  padding: 5px 12px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 100px;
  color: var(--color-200);
}

.cs-chip--accent {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.cs-hero-title {
  font-size: clamp(48px, 7vw, 100px);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -1px;
  text-transform: uppercase;
  color: var(--color-200);
  margin-bottom: 24px;
}

.cs-hero-subtitle {
  font-size: clamp(15px, 1.4vw, 18px);
  color: var(--color-600);
  max-width: 560px;
  line-height: 1.7;
  letter-spacing: 0.3px;
}


/* ============================================
   OVERVIEW STRIP
   ============================================ */
.cs-overview {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.cs-ov-item {
  padding: 28px 36px;
  border-right: 1px solid rgba(255,255,255,0.08);
}
.cs-ov-item:last-child { border-right: none; }

.cs-ov-label {
  display: block;
  font-size: 9px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--color-500);
  margin-bottom: 6px;
}

.cs-ov-value {
  display: block;
  font-size: 13px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-200);
  font-weight: 600;
}

/* ============================================
   SECTIONS
   ============================================ */
.cs-section {
  padding: 96px 64px;
}

.cs-section--alt {
  background: var(--color-700);
}

.cs-container {
  max-width: 1100px;
  margin: 0 auto;
}

.cs-section-eyebrow {
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
}

.cs-section-title {
  font-size: clamp(28px, 3.5vw, 48px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  line-height: 1.05;
  color: var(--color-200);
  margin-bottom: 32px;
}

.cs-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-600);
  max-width: 680px;
}

/* Two-column layout */
.cs-two-col {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 64px;
  align-items: start;
}

/* Quote callout */
.cs-callout {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-left: 3px solid var(--primary);
  padding: 32px;
  border-radius: 4px;
}

.cs-callout blockquote {
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-200);
  font-style: italic;
  margin-bottom: 12px;
}

.cs-callout cite {
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-500);
  font-style: normal;
}

/* ============================================
   RESEARCH METHODS
   ============================================ */
.cs-method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 48px 0;
}

.cs-method-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  padding: 32px 28px;
  transition: border-color 0.3s ease, background 0.3s ease;
}
.cs-method-card:hover {
  border-color: rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
}

.cs-method-icon {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(207,75,75,0.12);
  border-radius: 10px;
  margin-bottom: 20px;
  color: var(--primary);
}

.cs-method-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-200);
  margin-bottom: 4px;
}

.cs-method-n {
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.cs-method-desc {
  font-size: 14px;
  color: var(--color-600);
  line-height: 1.7;
}

/* Key findings row */
.cs-findings {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 48px;
}

.cs-finding {
  background: var(--color-800);
  padding: 32px 28px;
}
.cs-section--alt .cs-finding { background: var(--color-700); }

.cs-finding-num {
  display: block;
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 10px;
}

.cs-finding p {
  font-size: 13px;
  color: var(--color-600);
  line-height: 1.6;
}

/* ============================================
   PROCESS PHASES
   ============================================ */
.cs-phases {
  display: flex;
  align-items: center;
  gap: 0;
  margin: 48px 0;
  overflow-x: auto;
  padding-bottom: 8px;
}

.cs-phase {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 100px;
}

.cs-phase-dot {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-500);
  position: relative;
  z-index: 1;
  transition: all 0.3s ease;
}

.cs-phase--active .cs-phase-dot {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  box-shadow: 0 0 24px rgba(207,75,75,0.35);
}

.cs-phase-label {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-500);
  text-align: center;
}

.cs-phase--active .cs-phase-label { color: var(--color-200); }

.cs-phase-connector {
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.1);
  margin-top: -28px;
}

/* ============================================
   MOCKUP PLACEHOLDERS
   ============================================ */
.cs-mockups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
}

.cs-mockup {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  aspect-ratio: 16/10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  position: relative;
}

.cs-mockup--lo {
  background: rgba(255,255,255,0.03);
}

.cs-mockup--hi {
  background: rgba(255,255,255,0.05);
}

.cs-mockup-label {
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-500);
  position: absolute;
  top: 20px;
  left: 24px;
}

/* Wireframe grid pattern */
.cs-mockup--lo::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}

.cs-mockup-icon {
  color: rgba(255,255,255,0.12);
  position: relative;
  z-index: 1;
}

.cs-mockup-title {
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.2);
  position: relative;
  z-index: 1;
}

/* Single wide mockup */
.cs-mockup--wide {
  grid-column: 1 / -1;
  aspect-ratio: 16/7;
}

/* Feature highlight cards */
.cs-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.cs-feature {
  padding: 28px 24px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 10px;
}

.cs-feature-num {
  font-size: 11px;
  letter-spacing: 2px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.cs-feature-title {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-200);
  margin-bottom: 8px;
}

.cs-feature-desc {
  font-size: 13px;
  color: var(--color-600);
  line-height: 1.7;
}

/* ============================================
   RESULTS
   ============================================ */
.cs-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  overflow: hidden;
  margin-top: 48px;
}

.cs-stat {
  background: var(--color-800);
  padding: 40px 32px;
  text-align: center;
}
.cs-section--alt .cs-stat { background: var(--color-700); }

.cs-stat-num {
  display: block;
  font-size: clamp(36px, 4.5vw, 60px);
  font-weight: 700;
  color: var(--color-200);
  line-height: 1;
  margin-bottom: 10px;
}

.cs-stat-label {
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-500);
}

/* ============================================
   LEARNINGS
   ============================================ */
.cs-learnings {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.cs-learning {
  padding: 36px 28px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  border-top: 3px solid var(--primary);
}

.cs-learning-num {
  font-size: 10px;
  letter-spacing: 2.5px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.cs-learning-title {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--color-200);
  margin-bottom: 10px;
}

.cs-learning p {
  font-size: 14px;
  color: var(--color-600);
  line-height: 1.7;
}

/* ============================================
   PARALLAX HEADER IMAGE
   ============================================ */
.cs-hero--parallax {
  position: relative;
  overflow: hidden;
}

.cs-hero--parallax .cs-hero-content {
  position: relative;
  z-index: 2;
}

.cs-hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.cs-header-img {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.cs-header-img-inner {
  position: absolute;
  inset: -20% 0;
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
  will-change: transform;
}

/* ============================================
   PROJECT SCREENSHOTS
   ============================================ */
.cs-project-img {
  margin: 40px 0 0;
}

.cs-project-img-label {
  font-size: 10px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--color-500);
  margin-bottom: 12px;
}

.cs-project-img img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
}

.cs-project-img--capped img {
  max-height: none;
  object-fit: unset;
}

.cs-project-img-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 40px 0 0;
  align-items: start;
}

.cs-project-img-pair .cs-project-img {
  margin: 0;
}

@media (max-width: 900px) {
  .cs-project-img-pair { grid-template-columns: 1fr; }
}

/* ============================================
   VIDEO EMBED
   ============================================ */
.cs-video-wrap {
  margin: 40px 0 0;
}

.cs-video {
  width: 100%;
  display: block;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,0.08);
  background: #111;
  outline: none;
}

/* ============================================
   FIGMA PROTOTYPE EMBED
   ============================================ */
.cs-proto {
  margin: 48px 0 0;
}

.cs-proto-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.cs-proto-badge {
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.cs-proto-badge::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  animation: proto-pulse 2s infinite;
}
@keyframes proto-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.cs-proto-hint {
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-500);
}

.cs-proto-tabs {
  display: flex;
  gap: 2px;
  flex-wrap: wrap;
}

.cs-proto-tab {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 4px;
  color: var(--color-500);
  font-family: 'Akshar', sans-serif;
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 7px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.cs-proto-tab:hover { border-color: rgba(255,255,255,0.3); color: var(--color-200); }
.cs-proto-tab--active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}

.cs-proto-frame {
  position: relative;
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  background: #111;
  /* 16:9 aspect ratio */
  padding-top: 62.5%;
}

.cs-proto-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.cs-proto-footer {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.cs-proto-footnote {
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-500);
  text-align: center;
}

.cs-proto-open {
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  padding-bottom: 1px;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}
.cs-proto-open:hover { color: var(--color-200); border-color: var(--color-200); }

@media (max-width: 900px) {
  .cs-proto-frame { padding-top: 75%; }
  .cs-proto-bar { flex-direction: column; align-items: flex-start; }
}

/* ============================================
   NEXT PROJECT
   ============================================ */
.cs-next {
  display: block;
  padding: 96px 64px;
  background: var(--color-700);
  border-top: 1px solid rgba(255,255,255,0.08);
  transition: background 0.3s ease;
  text-align: center;
}
.cs-next:hover { background: rgba(207,75,75,0.08); }

.cs-next-eyebrow {
  font-size: 10px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--color-500);
  margin-bottom: 16px;
}

.cs-next-title {
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.5px;
  color: var(--color-200);
  transition: color 0.3s ease;
}
.cs-next:hover .cs-next-title { color: var(--primary); }

/* ============================================
   FOOTER
   ============================================ */
.cs-footer {
  padding: 28px 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.cs-footer-copy {
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-500);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
  .cs-hero { padding: 100px 28px 56px; }
  .cs-section { padding: 64px 28px; }
  .cs-overview { grid-template-columns: repeat(2, 1fr); }
  .cs-ov-item { border-right: none; border-bottom: 1px solid rgba(255,255,255,0.08); }
  .cs-two-col { grid-template-columns: 1fr; gap: 32px; }
  .cs-method-grid { grid-template-columns: 1fr; }
  .cs-findings { grid-template-columns: 1fr; }
  .cs-mockups { grid-template-columns: 1fr; }
  .cs-features { grid-template-columns: 1fr; }
  .cs-stats { grid-template-columns: repeat(2, 1fr); }
  .cs-learnings { grid-template-columns: 1fr; }
  .cs-next { padding: 64px 28px; }
  .cs-footer { padding: 24px 28px; flex-direction: column; gap: 12px; text-align: center; }
}