/* ==========================================================================
   KUROGANE MANGA ARCHIVE - REFINED GREYSCALE THEME STYLESHEET
   Framework: Bootstrap 5.3 + Custom Architectural Grayscale System
   ========================================================================== */

:root {
  --bg-darkest: #0e1013;
  --bg-primary: #14161b;
  --bg-secondary: #1b1d24;
  --bg-tertiary: #232630;
  --bg-card: #1e2129;
  --bg-hover: #292c37;

  --border-subtle: #2b2e3a;
  --border-medium: #3b3f4f;
  --border-bright: #646b80;

  --text-main: #f3f4f7;
  --text-body: #c0c5d2;
  --text-muted: #798094;
  --text-dim: #545b6d;

  --accent-titanium: #d5d9e2;
  --accent-cool-white: #ffffff;
  --accent-ink-black: #08090b;
  --accent-ruby: #dc2626;
  --accent-amber: #d97706;

  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

/* Global Reset & Base */
html, body {
  background-color: var(--bg-darkest);
  color: var(--text-body);
  font-family: var(--font-sans);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent-titanium);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--accent-cool-white);
}

::selection {
  background-color: #3b4252;
  color: #fff;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}
::-webkit-scrollbar-track {
  background: var(--bg-darkest);
}
::-webkit-scrollbar-thumb {
  background: #2e323e;
  border-radius: 2px;
}
::-webkit-scrollbar-thumb:hover {
  background: #4a5063;
}

/* Monospace & Typographic Touches */
.font-mono-tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.heading-display {
  font-family: var(--font-sans);
  letter-spacing: -0.02em;
  font-weight: 700;
  color: var(--text-main);
}

.text-silver {
  color: var(--accent-titanium) !important;
}

/* Header & Navigation Bar */
.kuro-navbar {
  background: rgba(18, 20, 25, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 1030;
  transition: background-color 0.3s ease;
}

.kuro-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--accent-cool-white);
}

.kuro-brand-icon {
  width: 32px;
  height: 32px;
  background: #252833;
  border: 1px solid var(--border-medium);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cool-white);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.nav-link-custom {
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-bottom: 2px solid transparent;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link-custom:hover {
  color: var(--text-main);
}

.nav-link-custom.active {
  color: var(--accent-cool-white);
  border-bottom-color: var(--accent-titanium);
}

/* Minimalist Selector / Badge */
.quick-manga-select {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-body);
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 0;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.quick-manga-select:focus {
  border-color: var(--border-bright);
  outline: none;
  box-shadow: none;
  color: var(--text-main);
}

/* Geometric Borders & Dividers */
.border-subtle-all {
  border: 1px solid var(--border-subtle);
}
.border-subtle-bottom {
  border-bottom: 1px solid var(--border-subtle);
}
.border-subtle-top {
  border-top: 1px solid var(--border-subtle);
}

/* Grayscale Card Panels */
.arch-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  transition: border-color 0.25s ease, transform 0.25s ease;
  position: relative;
}

.arch-card:hover {
  border-color: var(--border-medium);
}

/* Hero Section */
.hero-asym-section {
  background: linear-gradient(180deg, var(--bg-darkest) 0%, var(--bg-primary) 100%);
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.hero-backdrop-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: 40px 40px;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  pointer-events: none;
}

.hero-main-cover {
  width: 100%;
  height: 480px;
  object-fit: cover;
  filter: contrast(1.08) brightness(0.92);
  border: 1px solid var(--border-medium);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
  transition: filter 0.3s ease, transform 0.3s ease;
}

.hero-main-cover:hover {
  filter: contrast(1.12) brightness(0.98);
}

/* Zero-Pill Metadata Label */
.meta-bracket {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  border-left: 2px solid var(--border-bright);
  padding-left: 0.45rem;
  margin-right: 0.8rem;
  line-height: 1.2;
}

.meta-bracket strong {
  color: var(--text-main);
  margin-left: 0.25rem;
}

/* Sharp Architectural Button */
.btn-kuro-primary {
  background-color: var(--accent-titanium);
  color: var(--accent-ink-black);
  border: 1px solid var(--accent-titanium);
  border-radius: 0;
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.6rem 1.4rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-kuro-primary:hover {
  background-color: var(--accent-cool-white);
  border-color: var(--accent-cool-white);
  color: #000;
  transform: translateY(-1px);
}

.btn-kuro-outline {
  background-color: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-medium);
  border-radius: 0;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.6rem 1.3rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-kuro-outline:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--border-bright);
  color: var(--accent-cool-white);
}

.btn-kuro-subtle {
  background-color: var(--bg-tertiary);
  color: var(--text-body);
  border: 1px solid var(--border-subtle);
  border-radius: 0;
  font-size: 0.8rem;
  padding: 0.4rem 0.9rem;
  transition: all 0.2s ease;
}

.btn-kuro-subtle:hover {
  background-color: var(--bg-hover);
  color: var(--accent-cool-white);
  border-color: var(--border-medium);
}

/* Dual Showcase Cards */
.dual-showcase-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  transition: all 0.25s ease;
  height: 100%;
}

.dual-showcase-item:hover {
  border-color: var(--border-medium);
  background: var(--bg-card);
}

.manga-cover-wrap {
  position: relative;
  overflow: hidden;
  background-color: #000;
}

.manga-cover-wrap img {
  width: 100%;
  aspect-ratio: 3/4;
  object-fit: cover;
  transition: transform 0.4s ease, filter 0.4s ease;
}

.dual-showcase-item:hover .manga-cover-wrap img {
  transform: scale(1.02);
}

.manga-index-number {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(14, 16, 19, 0.85);
  backdrop-filter: blur(4px);
  border: 1px solid var(--border-medium);
  color: var(--text-main);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  font-weight: 700;
}

.manga-rating-badge {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: rgba(14, 16, 19, 0.9);
  border: 1px solid var(--border-subtle);
  color: var(--accent-titanium);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.2rem 0.55rem;
  font-weight: 600;
}

/* Catalog Filter Tabs */
.filter-btn-tab {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 0.45rem 1rem;
  border-radius: 0;
  transition: all 0.2s ease;
}

.filter-btn-tab:hover {
  color: var(--text-main);
  border-color: var(--border-medium);
}

.filter-btn-tab.active {
  background: var(--bg-tertiary);
  color: var(--accent-cool-white);
  border-color: var(--border-bright);
}

/* Detail Dossier Specification Table */
.spec-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (max-width: 768px) {
  .spec-grid {
    grid-template-columns: 1fr;
  }
}

.spec-cell {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.85rem 1.1rem;
}

.spec-cell .spec-key {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}

.spec-cell .spec-val {
  font-size: 0.94rem;
  color: var(--text-main);
  font-weight: 500;
}

/* Chapter List Grid */
.chapter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  transition: background-color 0.2s ease;
}

.chapter-row:hover {
  background: var(--bg-tertiary);
}

.chapter-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  width: 70px;
}

.chapter-title {
  color: var(--text-main);
  font-size: 0.9rem;
  flex-grow: 1;
}

.chapter-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
}

/* Character Dossier Card */
.character-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 1.1rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.character-avatar {
  width: 68px;
  height: 68px;
  object-fit: cover;
  border: 1px solid var(--border-medium);
  flex-shrink: 0;
  filter: grayscale(30%);
}

/* Gallery & Manga Reader Styles */
.gallery-viewport-bar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 1.25rem;
  position: sticky;
  top: 57px;
  z-index: 1020;
}

.manga-panel-img {
  width: 100%;
  max-width: 860px;
  height: auto;
  display: block;
  margin: 0 auto;
  border: 1px solid var(--border-subtle);
  background-color: #0b0c0e;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.75);
  transition: filter 0.3s ease;
}

/* Filters for Reader */
.filter-monochrome {
  filter: grayscale(100%) contrast(1.15) !important;
}

.filter-ink {
  filter: grayscale(100%) contrast(1.3) brightness(0.95) !important;
}

.filter-warm-sepia {
  filter: sepia(35%) contrast(1.05) brightness(0.96) !important;
}

/* Double Spread Mode */
.double-spread-wrap {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2px;
  max-width: 1300px;
  margin: 0 auto;
}

.double-spread-wrap .manga-panel-img {
  max-width: 50%;
  margin: 0;
}

/* Lightbox Modal */
.kuro-lightbox {
  position: fixed;
  inset: 0;
  background: rgba(8, 9, 11, 0.96);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.kuro-lightbox.show {
  display: flex;
}

.lightbox-img {
  max-height: 88vh;
  max-width: 90vw;
  object-fit: contain;
  border: 1px solid var(--border-medium);
  box-shadow: 0 0 50px rgba(0,0,0,0.9);
}

/* Thumbnail Strip at Bottom */
.thumb-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 10px 0;
  scrollbar-width: thin;
}

.thumb-strip-item {
  width: 54px;
  height: 72px;
  object-fit: cover;
  border: 1px solid var(--border-subtle);
  opacity: 0.6;
  cursor: pointer;
  transition: all 0.2s ease;
}

.thumb-strip-item:hover, .thumb-strip-item.active {
  opacity: 1;
  border-color: var(--accent-titanium);
  transform: translateY(-2px);
}

/* Comparison Drawer */
.kuro-drawer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-primary);
  border-top: 1px solid var(--border-bright);
  z-index: 1050;
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.8);
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  max-height: 70vh;
  overflow-y: auto;
}

.kuro-drawer.open {
  transform: translateY(0);
}


/* Real-data states, preserving the original grayscale geometry. */
[hidden]{display:none!important}
.kuro-brand{max-width:440px;min-width:0}.kuro-brand-icon{flex-shrink:0}.kuro-brand [data-site-name]{overflow-wrap:anywhere}
.text-muted{color:#a1a8b8!important}.text-dim{color:#9098ac!important}.text-body{color:var(--text-body)!important}
.message{padding:2.5rem;border:1px solid var(--border-subtle);background:var(--bg-secondary)}
.cover-empty{display:flex;align-items:center;justify-content:center;min-height:280px;background:var(--bg-tertiary);color:var(--text-body)}
.comic-intro{white-space:pre-line;overflow-wrap:anywhere}.comic-excerpt{display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
button:disabled{opacity:.45;cursor:not-allowed;transform:none}a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--accent-titanium);outline-offset:3px}
#pager a[aria-current=page]{background:var(--accent-titanium);color:var(--accent-ink-black)}
.gallery-viewport-bar{top:var(--header-height,70px)}#comicPages .reader-images{display:flex;flex-direction:column;gap:2.5rem}
#comicPages .reader-images.double{flex-direction:row;justify-content:center;align-items:flex-start;gap:4px}#comicPages .reader-images.double figure{width:50%;min-width:0}
#comicPages figure{margin:0}#comicPages figcaption{text-align:center;color:var(--text-body);font-size:.8rem;margin-top:.75rem}
#mangaReadingViewport:fullscreen{overflow:auto;background:var(--bg-darkest)}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

#comicPages{overflow-x:auto}