/*
  Copyright (c) 2026 Sai​‌‍​‌‍ Rajeev. All Rights Reserved.
  Case Study Shared Stylesheet
*/

/* ─── Import from main design system ─── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ─── Root Variables (mirrors index.css dark theme) ─── */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0f0f1a;
  --bg-card: #13131f;
  --bg-glass: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(139,92,246,0.4);
  --text-primary: #f0f0ff;
  --text-secondary: #8888aa;
  --text-muted: #555577;
  --accent-1: #7c3aed;
  --accent-2: #06b6d4;
  --accent-3: #f59e0b;
  --gradient-main: linear-gradient(135deg, #7c3aed, #06b6d4);
  --gradient-card: linear-gradient(135deg, rgba(124,58,237,0.15), rgba(6,182,212,0.08));
  --shadow-glow: 0 0 40px rgba(124,58,237,0.15);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

[data-theme="light"] {
  --bg-primary: #f5f5fa;
  --bg-secondary: #ebebf5;
  --bg-card: #ffffff;
  --bg-glass: rgba(108,92,231,0.04);
  --border: rgba(0,0,0,0.09);
  --border-hover: rgba(108,92,231,0.35);
  --text-primary: #1a1a2e;
  --text-secondary: #555570;
  --text-muted: #9999bb;
  --shadow-glow: 0 0 40px rgba(124,58,237,0.08);
}
[data-theme="light"] .cs-nav {
  background: rgba(245,245,250,0.9);
  border-bottom-color: rgba(0,0,0,0.08);
}
[data-theme="light"] .cs-carousel-btn {
  background: rgba(255,255,255,0.85);
  color: #1a1a2e;
  border-color: rgba(0,0,0,0.15);
}
[data-theme="light"] .code-block {
  background: #1a1a2e;
}


/* ─── Reset & Base ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ─── Case Study Navbar ─── */
.cs-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.cs-nav-back {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}
.cs-nav-back:hover { color: var(--accent-1); }
.cs-nav-back i { font-size: 0.75rem; }

.cs-nav-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.02em;
}

.cs-nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.cs-nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.cs-nav-link:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
  background: var(--bg-glass);
}
.cs-nav-link.live {
  background: var(--gradient-main);
  color: #fff;
  border-color: transparent;
}
.cs-nav-link.live:hover { opacity: 0.9; }

/* Theme toggle button in case study nav */
.cs-theme-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-glass);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: all var(--transition);
  flex-shrink: 0;
}
.cs-theme-btn:hover { border-color: var(--accent-1); color: var(--accent-1); background: rgba(124,58,237,0.08); }

/* ─── Case Study Hero ─── */
.cs-hero {
  padding: 120px 0 80px;
  position: relative;
  overflow: hidden;
}

.cs-hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(124,58,237,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.cs-hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(124,58,237,0.12);
  border: 1px solid rgba(124,58,237,0.3);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #a78bfa;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.cs-hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.cs-hero h1 .gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cs-hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 620px;
  margin-bottom: 32px;
  line-height: 1.8;
}

.cs-tech-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.cs-tech-badge {
  padding: 5px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.cs-hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.cs-btn-primary, .cs-btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
}

.cs-btn-primary {
  background: var(--gradient-main);
  color: #fff;
  border: none;
}
.cs-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(124,58,237,0.4); }

.cs-btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.cs-btn-secondary:hover { border-color: var(--border-hover); background: rgba(124,58,237,0.08); }

/* ─── Disclaimer Banner ─── */
.cs-disclaimer {
  margin-top: 28px;
  padding: 14px 20px;
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.25);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  max-width: 640px;
}
.cs-disclaimer i { color: var(--accent-3); margin-top: 2px; flex-shrink: 0; }
.cs-disclaimer p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.6; }
.cs-disclaimer strong { color: #fbbf24; }

/* ─── Section Headers ─── */
.cs-section {
  padding: 80px 0;
}

.cs-section + .cs-section {
  border-top: 1px solid var(--border);
}

.cs-section-alt {
  background: var(--bg-secondary);
}

.cs-section-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin-bottom: 12px;
}

.cs-section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

.cs-section-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.8;
  margin-bottom: 48px;
}

/* ─── Carousel ─── */
.cs-carousel {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-glow);
  width: 100%;
  max-width: 100%;
}

.cs-carousel-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4,0,0.2,1);
}

.cs-carousel-slide {
  min-width: 100%;
  position: relative;
}

.cs-carousel-slide img {
  width: 100%;
  height: 480px;
  object-fit: cover;
  object-position: top;
  display: block;
}

.cs-carousel-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 24px;
  background: linear-gradient(transparent, rgba(0,0,0,0.85));
  color: #fff;
  font-size: 0.875rem;
  font-weight: 500;
}

.cs-carousel-caption span {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(124,58,237,0.6);
  border-radius: 4px;
  font-size: 0.72rem;
  margin-bottom: 6px;
}

/* Carousel Controls */
.cs-carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  background: rgba(0,0,0,0.6);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 50%;
  color: #fff;
  font-size: 0.875rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  z-index: 10;
  backdrop-filter: blur(10px);
}
.cs-carousel-btn:hover { background: var(--accent-1); border-color: var(--accent-1); }
.cs-carousel-btn.prev { left: 16px; }
.cs-carousel-btn.next { right: 16px; }

.cs-carousel-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 16px;
}

.cs-carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}
.cs-carousel-dot.active {
  background: var(--accent-1);
  width: 24px;
  border-radius: 4px;
}

/* ─── KPI Stats ─── */
.cs-kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
}

.cs-kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.cs-kpi-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-main);
  opacity: 0;
  transition: opacity var(--transition);
}
.cs-kpi-card:hover { transform: translateY(-4px); border-color: var(--border-hover); box-shadow: var(--shadow-glow); }
.cs-kpi-card:hover::before { opacity: 1; }

.cs-kpi-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
  display: block;
}

.cs-kpi-value {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 6px;
}

.cs-kpi-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ─── Module Chevrons ─── */
.cs-modules-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: stretch;
}

.cs-module-chevron {
  flex: 1;
  min-width: 140px;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 24px 16px 24px 28px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  transition: all var(--transition);
  cursor: default;
}

.cs-module-chevron:not(:last-child)::after {
  content: '';
  position: absolute;
  right: -16px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 30px solid transparent;
  border-bottom: 30px solid transparent;
  border-left: 16px solid var(--bg-card);
  z-index: 2;
}

.cs-module-chevron:not(:last-child)::before {
  content: '';
  position: absolute;
  right: -18px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 31px solid transparent;
  border-bottom: 31px solid transparent;
  border-left: 17px solid var(--border);
  z-index: 1;
}

.cs-module-chevron:hover {
  background: var(--gradient-card);
  border-color: var(--border-hover);
}

.cs-module-chevron:hover::after {
  border-left-color: #1a1030;
}

.cs-module-num {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-1);
  letter-spacing: 0.08em;
}

.cs-module-icon {
  font-size: 1.3rem;
}

.cs-module-name {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

/* ─── Feature Grid ─── */
.cs-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.cs-feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}
.cs-feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(124,58,237,0.12);
}

.cs-feature-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-card);
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 16px;
}

.cs-feature-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.cs-feature-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ─── FAQ Accordion ─── */
.cs-faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cs-faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}

.cs-faq-item.open {
  border-color: rgba(124,58,237,0.3);
}

.cs-faq-question {
  width: 100%;
  background: none;
  border: none;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  text-align: left;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  transition: color var(--transition);
}

.cs-faq-question:hover { color: #a78bfa; }

.cs-faq-chevron {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--bg-glass);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.cs-faq-item.open .cs-faq-chevron {
  background: var(--accent-1);
  border-color: var(--accent-1);
  color: #fff;
  transform: rotate(180deg);
}

.cs-faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}

.cs-faq-item.open .cs-faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

.cs-faq-answer p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* ─── Tech Stack Row ─── */
.cs-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cs-tech-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition);
}
.cs-tech-pill:hover { border-color: var(--border-hover); background: rgba(124,58,237,0.08); }
.cs-tech-pill i { color: var(--accent-1); }

/* ─── Role Badges ─── */
.cs-roles-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.cs-role-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--gradient-card);
  border: 1px solid rgba(124,58,237,0.2);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #a78bfa;
}

/* ─── CTA Section ─── */
.cs-cta {
  padding: 80px 0;
  text-align: center;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.cs-cta h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cs-cta p {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 32px;
}

.cs-cta-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ─── Overview Two-Column ─── */
.cs-overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

@media (max-width: 768px) {
  .cs-overview-grid { grid-template-columns: 1fr; gap: 32px; }
}

.cs-overview-text h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.cs-overview-text p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.cs-overview-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cs-overview-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.cs-overview-list li::before {
  content: '✓';
  color: var(--accent-2);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* ─── Footer ─── */
.cs-footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.cs-footer p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .cs-nav { padding: 0 20px; }
  .cs-nav-title { display: none; }
  .cs-modules-flow { flex-direction: column; }
  .cs-module-chevron { min-width: 0; width: 100%; }
  .cs-module-chevron::after, .cs-module-chevron::before { display: none; }
  .cs-carousel-slide img { height: 260px; }
}

@media (max-width: 600px) {
  .cs-hero { padding: 100px 0 60px; }
  .cs-kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .cs-nav-links { gap: 8px; }
  .cs-nav-link span { display: none; }
  .cs-feature-grid { grid-template-columns: 1fr; }
  .cs-carousel-slide img { height: 220px; }
  .cs-carousel-btn { width: 36px; height: 36px; font-size: 0.75rem; }
  .cs-carousel-btn.prev { left: 8px; }
  .cs-carousel-btn.next { right: 8px; }
  .cs-carousel-caption { padding: 12px 16px; font-size: 0.8rem; }
}

@media (max-width: 400px) {
  .cs-carousel-slide img { height: 180px; }
}

/* ─── Reveal Animations ─── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal-left.visible { opacity: 1; transform: translateX(0); }