/* ═══════════════════════════════════════════════════════
   LUMA DESIGN SYSTEM — CASE STUDY STYLES
   Theme: OLED Dark (#050914) · Luma Blue (#2563EB) & Cyber Cyan (#38BDF8)
   Serial Flow: 8 Acts Presentation Architecture
   Companion to: assets/css/styles.css & assets/css/case-study.css
   ═══════════════════════════════════════════════════════ */

:root {
  --luma-bg: #050811;
  --luma-surface: #0A0F1D;
  --luma-surface-elevated: #111827;
  --luma-border: #1E293B;
  --luma-border-bright: #334155;
  --luma-blue: #2563EB;
  --luma-blue-glow: rgba(37, 99, 235, 0.35);
  --luma-cyan: #38BDF8;
  --luma-cyan-glow: rgba(56, 189, 248, 0.25);
  --luma-text: #F8FAFC;
  --luma-muted: #94A3B8;
  --luma-dim: #64748B;
}

body.luma-body {
  background-color: var(--luma-bg);
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.12) 0%, transparent 60%),
    radial-gradient(circle, #1E293B 1px, transparent 1px);
  background-size: 100% 100%, 20px 20px;
  color: var(--luma-text);
  font-family: 'Geist Mono', monospace;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Reading Progress Bar ────────────────────────────────── */
.luma-progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(15, 23, 42, 0.8);
  z-index: 200;
}

.luma-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #2563EB, #38BDF8, #60A5FA);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.7);
  transition: width 80ms ease-out;
}

/* ── Top Navigation Bar ──────────────────────────────────── */
.luma-topnav {
  position: sticky;
  top: 0;
  z-index: 150;
  background-color: rgba(5, 8, 17, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--luma-border);
  padding-block: 10px;
  transition: all 250ms ease;
}

.luma-topnav.scrolled {
  background-color: rgba(5, 8, 17, 0.96);
  border-bottom-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.8);
}

.luma-topnav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 48px);
}

.luma-nav-left {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.luma-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--luma-muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 6px;
  background: #0B1120;
  border: 1px solid var(--luma-border);
  transition: all 200ms ease;
}

.luma-back-link:hover {
  color: #FFFFFF;
  border-color: var(--luma-cyan);
  box-shadow: 0 0 12px var(--luma-cyan-glow);
  transform: translateX(-2px);
}

.luma-back-link svg {
  color: var(--luma-cyan);
}

.luma-brand-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--luma-text);
}

.luma-brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--luma-blue);
  box-shadow: 0 0 8px var(--luma-blue);
}

/* ── Act Pills Scrollable Bar ────────────────────────────── */
.luma-act-pills {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #0B1120;
  border: 1px solid var(--luma-border);
  border-radius: 100px;
  padding: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.luma-act-pills::-webkit-scrollbar {
  display: none;
}

.luma-act-pill {
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--luma-muted);
  text-decoration: none;
  padding: 5px 12px;
  border-radius: 100px;
  white-space: nowrap;
  transition: all 200ms ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.luma-act-pill:hover {
  color: #FFFFFF;
  background: rgba(37, 99, 235, 0.15);
}

.luma-act-pill.active {
  color: #FFFFFF;
  background: var(--luma-blue);
  box-shadow: 0 0 14px var(--luma-blue-glow);
}

.luma-act-pill .pill-num {
  opacity: 0.7;
}

/* ── Hero Section ────────────────────────────────────────── */
.luma-hero {
  padding-top: clamp(48px, 6vw, 80px);
  padding-bottom: clamp(40px, 5vw, 64px);
  position: relative;
}

.luma-hero-container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 60px);
}

.luma-hero-prompt {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding: 6px 14px;
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--luma-cyan);
}

.luma-hero-prompt .prompt-caret {
  color: #FFFFFF;
  animation: lumaPulse 1.8s infinite;
}

@keyframes lumaPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.luma-hero-title {
  font-family: 'Geist Mono', sans-serif;
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  margin-top: 0;
  margin-bottom: 20px;
}

.luma-hero-title .text-gradient {
  background: linear-gradient(135deg, #38BDF8 0%, #2563EB 50%, #60A5FA 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.luma-hero-lead {
  font-family: 'Geist Mono', sans-serif;
  font-size: clamp(16px, 1.8vw, 20px);
  font-weight: 400;
  line-height: 1.6;
  color: var(--luma-muted);
  max-width: 900px;
  margin-bottom: 36px;
}

/* ── Meta Grid ───────────────────────────────────────────── */
.luma-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background: var(--luma-surface);
  border: 1px solid var(--luma-border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 40px;
}

@media (max-width: 900px) {
  .luma-meta-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 540px) {
  .luma-meta-grid {
    grid-template-columns: 1fr;
  }
}

.luma-meta-item dt {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--luma-cyan);
  text-transform: uppercase;
  margin-bottom: 6px;
}

.luma-meta-item dd {
  margin: 0;
  font-size: 13px;
  font-weight: 500;
  color: #FFFFFF;
}

/* ── Quick Overview Strip ────────────────────────────────── */
.luma-overview-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding: 16px 24px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: 8px;
  font-size: 12px;
  color: var(--luma-muted);
}

.luma-overview-strip strong {
  color: #FFFFFF;
}

.luma-cta-scroll {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 6px;
  background: var(--luma-blue);
  color: #FFFFFF;
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 14px var(--luma-blue-glow);
  transition: all 200ms ease;
}

.luma-cta-scroll:hover {
  background: #1D4ED8;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--luma-blue-glow);
}

/* ── Serial Acts Section ─────────────────────────────────── */
.luma-acts-section {
  padding-block: 40px 100px;
}

.luma-act-wrapper {
  max-width: 1400px;
  margin-inline: auto;
  padding-inline: clamp(16px, 3.5vw, 48px);
  margin-bottom: 72px;
  position: relative;
  scroll-margin-top: 80px;
  opacity: 1 !important;
  transform: none !important;
  display: block;
}

/* ── Act Header Box ──────────────────────────────────────── */
.luma-act-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 20px 24px;
  background: var(--luma-surface);
  border: 1px solid var(--luma-border);
  border-top-left-radius: 14px;
  border-top-right-radius: 14px;
  border-bottom: none;
}

.luma-act-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.luma-act-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--luma-cyan);
  text-transform: uppercase;
}

.luma-act-badge .badge-tag {
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.35);
  padding: 2px 8px;
  border-radius: 4px;
}

.luma-act-title {
  font-family: 'Geist Mono', sans-serif;
  font-size: clamp(20px, 2.5vw, 28px);
  font-weight: 700;
  color: #FFFFFF;
  margin: 0;
  letter-spacing: -0.01em;
}

.luma-act-desc {
  font-family: 'Geist Mono', monospace;
  font-size: 12px;
  color: var(--luma-muted);
  margin: 0;
  max-width: 720px;
}

.luma-act-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.luma-zoom-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: #0B1120;
  border: 1px solid var(--luma-border);
  border-radius: 6px;
  color: #FFFFFF;
  font-family: 'Geist Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: all 200ms ease;
}

.luma-zoom-btn:hover {
  background: var(--luma-blue);
  border-color: var(--luma-cyan);
  box-shadow: 0 0 14px var(--luma-blue-glow);
  transform: translateY(-1px);
}

.luma-zoom-btn svg {
  color: var(--luma-cyan);
}

/* ── Act Image Frame ─────────────────────────────────────── */
.luma-act-frame {
  position: relative;
  background: #000000;
  border: 1px solid var(--luma-border);
  border-bottom-left-radius: 14px;
  border-bottom-right-radius: 14px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 0 1px rgba(255, 255, 255, 0.02);
  cursor: zoom-in;
  transition: border-color 300ms ease, box-shadow 300ms ease;
}

.luma-act-frame:hover {
  border-color: rgba(56, 189, 248, 0.5);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.9), 0 0 25px var(--luma-cyan-glow);
}

.luma-act-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
  transition: transform 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Subtle inspect hint overlay */
.luma-frame-hint {
  position: absolute;
  bottom: 20px;
  right: 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(10, 15, 29, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--luma-border-bright);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #FFFFFF;
  opacity: 0;
  transform: translateY(8px);
  transition: all 250ms ease;
  pointer-events: none;
}

.luma-act-frame:hover .luma-frame-hint {
  opacity: 1;
  transform: translateY(0);
}

/* ── Serial Act Connector ────────────────────────────────── */
.luma-act-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 36px;
  color: var(--luma-dim);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.luma-connector-line {
  width: 2px;
  height: 36px;
  background: linear-gradient(180deg, var(--luma-border-bright), var(--luma-blue), transparent);
}

.luma-connector-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(11, 17, 32, 0.8);
  border: 1px dashed var(--luma-border);
  border-radius: 100px;
}

/* ── Fullscreen Interactive Lightbox Modal ───────────────── */
.luma-lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(3, 5, 12, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}

.luma-lightbox.is-open {
  opacity: 1;
  pointer-events: auto;
}

.luma-lightbox-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: rgba(10, 15, 29, 0.95);
  border-bottom: 1px solid var(--luma-border);
  z-index: 10;
  flex-shrink: 0;
}

.luma-lightbox-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.luma-lightbox-act {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--luma-cyan);
}

.luma-lightbox-title {
  font-family: 'Geist Mono', sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: #FFFFFF;
}

.luma-lightbox-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.luma-ctrl-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: #0B1120;
  border: 1px solid var(--luma-border);
  border-radius: 6px;
  color: #FFFFFF;
  cursor: pointer;
  transition: all 180ms ease;
}

.luma-ctrl-btn:hover {
  background: var(--luma-blue);
  border-color: var(--luma-cyan);
  box-shadow: 0 0 10px var(--luma-blue-glow);
}

.luma-ctrl-btn--close {
  background: rgba(239, 68, 68, 0.15);
  border-color: rgba(239, 68, 68, 0.4);
  color: #F87171;
}

.luma-ctrl-btn--close:hover {
  background: #EF4444;
  border-color: #EF4444;
  color: #FFFFFF;
  box-shadow: 0 0 14px rgba(239, 68, 68, 0.5);
}

.luma-lightbox-stage {
  flex: 1;
  position: relative;
  overflow: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px;
  cursor: grab;
}

.luma-lightbox-stage:active {
  cursor: grabbing;
}

.luma-lightbox-img-wrap {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  transition: transform 150ms ease-out;
  transform-origin: center top;
  max-width: 100%;
}

.luma-lightbox-img {
  max-width: 100%;
  width: auto;
  height: auto;
  display: block;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.9);
  user-select: none;
  -webkit-user-drag: none;
}

/* Lightbox Nav Arrows */
.luma-lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(10, 15, 29, 0.85);
  border: 1px solid var(--luma-border-bright);
  color: #FFFFFF;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 20;
  transition: all 200ms ease;
}

.luma-lightbox-nav:hover {
  background: var(--luma-blue);
  border-color: var(--luma-cyan);
  box-shadow: 0 0 16px var(--luma-blue-glow);
  transform: translateY(-50%) scale(1.08);
}

.luma-lightbox-nav--prev {
  left: 24px;
}

.luma-lightbox-nav--next {
  right: 24px;
}

@media (max-width: 768px) {
  .luma-lightbox-nav {
    display: none;
  }
}

/* ── Footer ──────────────────────────────────────────────── */
.luma-footer {
  background: #02040A;
  border-top: 1px solid var(--luma-border);
  padding-block: 48px 36px;
  margin-top: 40px;
}

.luma-footer-inner {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 60px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.luma-footer-links {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.luma-footer-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 6px;
  background: #0B1120;
  border: 1px solid var(--luma-border);
  color: #FFFFFF;
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  transition: all 200ms ease;
}

.luma-footer-btn:hover {
  border-color: var(--luma-cyan);
  box-shadow: 0 0 12px var(--luma-cyan-glow);
  color: #FFFFFF;
  transform: translateY(-2px);
}

.luma-footer-copy {
  font-size: 11px;
  color: var(--luma-dim);
  margin: 0;
}

@media (max-width: 640px) {
  /* Two-row topnav: back link + brand, then the full-width act pills */
  .luma-topnav-inner {
    flex-wrap: wrap;
    gap: 8px;
  }

  .luma-act-pills {
    width: 100%;
  }

  .luma-act-pill {
    padding: 8px 12px;
  }

  .luma-act-wrapper {
    scroll-margin-top: 120px;
  }

  .luma-footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }

  .luma-footer-links {
    flex-direction: column;
    width: 100%;
    gap: 10px;
  }

  .luma-footer-btn {
    width: 100%;
    justify-content: center;
    padding: 10px 16px;
  }
}