:root {
  --bg-void: #0B0B0E;
  --bg-slate: #121218;
  --bg-ash: #1A1A22;
  --border-hairline: #262631;
  --crimson-primary: #B11226;
  --crimson-ember: #FF2A44;
  --crimson-oxblood: #5C0A14;
  --text-bone: #EAE4DC;
  --text-pewter: #A7A09A;
  --text-muted: #6C6661;
  --status-amber: #D9822B;
}

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

body {
  background-color: var(--bg-void);
  color: var(--text-bone);
  font-family: "Segoe UI Variable Text", "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--crimson-ember);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(11, 11, 14, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
}

.header-inner {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0.9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-home {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: var(--text-pewter);
  transition: color 0.15s ease;
}

.brand-home:hover {
  color: var(--text-bone);
  text-decoration: none;
}

.brand-sep {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.brand-mark {
  width: 12px;
  height: 12px;
  background: var(--crimson-ember);
  box-shadow: 0 0 12px var(--crimson-primary);
  transform: rotate(45deg);
}

.brand-title {
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.95rem;
  color: var(--text-bone);
}

.brand-version {
  font-size: 0.78rem;
  padding: 0.15rem 0.5rem;
  background: var(--crimson-oxblood);
  border: 1px solid var(--crimson-primary);
  color: var(--text-bone);
  border-radius: 3px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.header-nav a {
  color: var(--text-pewter);
  transition: color 0.15s ease;
}

.header-nav a:hover {
  color: var(--text-bone);
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.2rem;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-ash);
  color: var(--text-bone);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn:hover {
  border-color: var(--crimson-ember);
  background: #22161c;
  text-decoration: none;
}

.btn-primary {
  background: var(--crimson-primary);
  border-color: var(--crimson-ember);
  color: var(--text-bone);
}

.btn-primary:hover {
  background: var(--crimson-ember);
  color: #0B0B0E;
}

.btn-block {
  width: 100%;
}

.container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Hero Section */
.hero {
  padding: 3.5rem 0 2.75rem;
  border-bottom: 1px solid var(--border-hairline);
  background: radial-gradient(circle at 80% 15%, rgba(177, 18, 38, 0.14), transparent 55%);
}

.eyebrow {
  color: var(--crimson-ember);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 0.65rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2rem, 3.5vw, 3rem);
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-lead {
  color: var(--text-pewter);
  font-size: 1.08rem;
  margin-bottom: 1.5rem;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.75rem;
}

.pill-badge {
  font-size: 0.8rem;
  padding: 0.3rem 0.7rem;
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  color: var(--text-bone);
  border-radius: 3px;
}

.pill-badge strong {
  color: var(--crimson-ember);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.download-card {
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  padding: 1.5rem;
  border-radius: 6px;
}

.download-card h2 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.download-card p {
  font-size: 0.9rem;
  color: var(--text-pewter);
  margin-bottom: 1rem;
}

.feature-list {
  list-style: none;
  margin-bottom: 1.25rem;
}

.feature-list li {
  font-size: 0.88rem;
  color: var(--text-bone);
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(38, 38, 49, 0.6);
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
}

.feature-list li span:last-child {
  color: var(--text-pewter);
  text-align: right;
}

.download-meta {
  margin-top: 0.85rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(38, 38, 49, 0.7);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.download-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-pewter);
}

.checksum-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-void);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  padding: 0.4rem 0.65rem;
  font-size: 0.75rem;
  overflow-x: auto;
}

.checksum-label {
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--crimson-ember);
  flex-shrink: 0;
}

.checksum-box code {
  color: var(--text-pewter);
  font-family: Consolas, "Cascadia Mono", monospace;
  word-break: break-all;
}

/* Interactive Story Viewer Stage */
.section-block {
  padding: 2.75rem 0;
  border-bottom: 1px solid var(--border-hairline);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.section-header h2 {
  font-size: 1.65rem;
}

.section-header p {
  color: var(--text-pewter);
  font-size: 0.95rem;
}

.stage-card {
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  padding: 1.5rem;
}

.stage-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding-bottom: 1.1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-hairline);
}

.stage-nav-controls {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.chapter-select {
  background: var(--bg-ash);
  color: var(--text-bone);
  border: 1px solid var(--border-hairline);
  padding: 0.55rem 0.8rem;
  border-radius: 4px;
  font-size: 0.92rem;
  min-width: 260px;
}

.view-mode-toggle {
  display: inline-flex;
  background: var(--bg-void);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  overflow: hidden;
}

.view-mode-btn {
  background: transparent;
  color: var(--text-pewter);
  border: none;
  padding: 0.5rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.view-mode-btn.active {
  background: var(--crimson-primary);
  color: var(--text-bone);
}

.stage-meta {
  margin-bottom: 1.25rem;
}

.stage-arc-pill {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  background: var(--crimson-oxblood);
  border: 1px solid var(--crimson-primary);
  color: var(--text-bone);
  border-radius: 3px;
  margin-bottom: 0.45rem;
}

.stage-title {
  font-size: 1.5rem;
  margin-bottom: 0.45rem;
}

.stage-storybeat {
  color: var(--text-pewter);
  font-size: 0.98rem;
  max-width: 980px;
}

/* 4-Monitor Physical Composition Grid */
.composite-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 0.9rem;
}

.panel-tile {
  background: var(--bg-void);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  overflow: hidden;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.panel-tile:hover {
  border-color: var(--crimson-ember);
}

.panel-tile img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  display: block;
}

.panel-caption {
  padding: 0.55rem 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  background: var(--bg-ash);
  border-top: 1px solid var(--border-hairline);
}

.panel-caption strong {
  color: var(--text-bone);
}

.panel-caption span {
  color: var(--text-pewter);
}

/* 1-Monitor Story Cycle View */
.single-panel-stage {
  display: none;
}

.single-panel-stage.active {
  display: block;
}

.composite-grid.hidden {
  display: none;
}

.single-panel-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
}

.panel-step-btn {
  flex: 1;
  min-width: 180px;
  text-align: left;
  padding: 0.6rem 0.85rem;
  background: var(--bg-void);
  border: 1px solid var(--border-hairline);
  color: var(--text-pewter);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.84rem;
}

.panel-step-btn.active {
  background: #221218;
  border-color: var(--crimson-ember);
  color: var(--text-bone);
}

.single-panel-frame {
  background: var(--bg-void);
  border: 1px solid var(--border-hairline);
  border-radius: 4px;
  overflow: hidden;
}

.single-panel-frame img {
  width: 100%;
  max-height: 560px;
  object-fit: contain;
  display: block;
  margin: 0 auto;
  cursor: pointer;
}

/* Filter Bar & Chapter Catalog Grid */
.filter-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.arc-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.arc-chip {
  font-size: 0.8rem;
  padding: 0.35rem 0.7rem;
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  color: var(--text-pewter);
  border-radius: 3px;
  cursor: pointer;
}

.arc-chip:hover,
.arc-chip.active {
  background: var(--crimson-primary);
  border-color: var(--crimson-ember);
  color: var(--text-bone);
}

.search-input {
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  color: var(--text-bone);
  padding: 0.55rem 0.85rem;
  border-radius: 4px;
  min-width: 260px;
  font-size: 0.9rem;
}

.chapters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.1rem;
}

.chapter-card {
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  border-radius: 5px;
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.chapter-card:hover,
.chapter-card.selected {
  border-color: var(--crimson-ember);
}

.card-mini-grid {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 2px;
  background: var(--bg-void);
}

.card-mini-grid img {
  width: 100%;
  height: 82px;
  object-fit: cover;
  display: block;
}

.card-body {
  padding: 0.95rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  flex: 1;
}

.card-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.76rem;
  color: var(--crimson-ember);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-bone);
}

.card-beat {
  font-size: 0.85rem;
  color: var(--text-pewter);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* App Showcase Screenshots */
.app-showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.showcase-panel {
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  overflow: hidden;
}

.showcase-panel img {
  width: 100%;
  height: auto;
  display: block;
  border-bottom: 1px solid var(--border-hairline);
}

.showcase-panel-body {
  padding: 1.1rem 1.25rem;
}

.showcase-panel-body h3 {
  font-size: 1.1rem;
  margin-bottom: 0.35rem;
}

.showcase-panel-body p {
  font-size: 0.9rem;
  color: var(--text-pewter);
}

/* Lightbox Modal */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(11, 11, 14, 0.94);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.lightbox.open {
  display: flex;
}

.lightbox-inner {
  max-width: 1280px;
  width: 100%;
  background: var(--bg-slate);
  border: 1px solid var(--border-hairline);
  border-radius: 6px;
  overflow: hidden;
}

.lightbox-header {
  padding: 0.85rem 1.2rem;
  background: var(--bg-ash);
  border-bottom: 1px solid var(--border-hairline);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.lightbox-body {
  padding: 1rem;
  text-align: center;
  background: var(--bg-void);
}

.lightbox-body img {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
}

.site-footer {
  padding: 2.5rem 0;
  color: var(--text-muted);
  font-size: 0.86rem;
  text-align: center;
}

.site-footer .footer-links {
  margin-top: 0.5rem;
  font-size: 0.82rem;
}

.site-footer .footer-links a {
  color: var(--text-pewter);
}

.site-footer .footer-links a:hover {
  color: var(--text-bone);
}

@media (max-width: 960px) {
  .hero-grid,
  .composite-grid,
  .app-showcase-grid {
    grid-template-columns: 1fr;
  }
}