/* ==========================================================================
   ÖMER TAHA DAĞ — SUBPAGE & CASE STUDY DESIGN SYSTEM
   Styles for /projects/* and /experience/* detail pages
   ========================================================================== */

/* Subpage Header & Top Navigation */
.subpage-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(8, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.85rem 1.5rem;
}

.subpage-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition-fast);
}

.nav-back-link:hover {
  color: var(--accent-cyan);
  transform: translateX(-3px);
}

.nav-back-link i {
  width: 16px;
  height: 16px;
}

.subpage-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
}

.subpage-breadcrumbs span {
  color: var(--text-primary);
}

/* Case Study Hero */
.case-study-hero {
  padding-top: 8.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
}

.case-study-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: rgba(168, 85, 247, 0.1);
  border: 1px solid var(--border-cyan);
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.case-study-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #fff;
  line-height: 1.15;
  margin-bottom: 1.25rem;
}

.case-study-lead {
  font-size: 1.18rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 820px;
  margin-bottom: 2.5rem;
}

/* Metadata Specs Grid */
.case-study-meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(16px);
}

.meta-box {
  display: flex;
  flex-direction: column;
}

.meta-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.meta-value {
  font-size: 0.95rem;
  color: #fff;
  font-weight: 600;
}

.meta-value.accent {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

/* Case Study Content Sections */
.case-study-body {
  padding: 4.5rem 0;
}

.case-study-layout {
  display: grid;
  grid-template-columns: 2.2fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.case-study-article h2 {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  margin-top: 3rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.case-study-article h2:first-child {
  margin-top: 0;
}

.case-study-article h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: #f1f5f9;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.case-study-article p {
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.case-study-article ul {
  list-style: none;
  margin-bottom: 1.75rem;
}

.case-study-article li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 0.65rem;
}

.case-study-article li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

/* Featured Technical Callout Box */
.tech-callout-box {
  background: rgba(14, 18, 26, 0.75);
  border: 1px solid var(--border-medium);
  border-left: 4px solid var(--accent-cyan);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;
  backdrop-filter: blur(14px);
}

.tech-callout-box h4 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

.tech-callout-box p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: var(--text-primary);
}

/* Technical Specification Sidebar */
.case-study-sidebar {
  position: sticky;
  top: 6rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  backdrop-filter: blur(16px);
}

.sidebar-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.spec-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.spec-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 0.65rem;
}

.spec-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.spec-key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

.spec-val {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-primary);
  font-weight: 600;
  text-align: right;
}

/* Image Showcase Banner in Subpage */
.subpage-media-banner {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-medium);
  margin: 2.25rem 0;
  background: #090c12;
}

.subpage-media-banner img {
  width: 100%;
  height: auto;
  max-height: 480px;
  object-fit: cover;
  display: block;
}

.subpage-media-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  padding: 0.75rem 1.25rem;
  background: rgba(14, 18, 26, 0.8);
  border-top: 1px solid var(--border-subtle);
}

/* Subpage Bottom Navigation (Next / Prev) */
.subpage-bottom-nav {
  padding: 3rem 0;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.subpage-nav-card {
  display: inline-flex;
  flex-direction: column;
  text-decoration: none;
  gap: 0.25rem;
  transition: var(--transition);
}

.subpage-nav-card:hover {
  transform: translateY(-2px);
}

.subpage-nav-dir {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
}

.subpage-nav-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
}

@media (max-width: 900px) {
  .case-study-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .case-study-sidebar {
    position: static;
  }
}