/* ==========================================================================
   SHELFIE (LIBRISYNC) – KOMPLETNÍ iOS 26 SPATIAL & AMBIENT DESIGN SYSTEM
   ========================================================================== */

:root {
  /* -- DYNAMICKÉ BAREVNÉ JÁDRO -- */
  --ambient-primary: #0a84ff;
  --ambient-secondary: #5e5ce6;
  --ambient-glow: rgba(10, 132, 255, 0.22);
  
  /* -- ABSOLUTNÍ ČERŇ A PROSTOROVÉ VRSTVY (OLED Optimized) -- */
  --bg-absolute: #000000;
  --bg-spatial-0: #050507;
  --bg-spatial-1: rgba(28, 28, 34, 0.65);
  --bg-spatial-2: rgba(44, 44, 52, 0.45);
  --bg-spatial-elevated: rgba(68, 68, 78, 0.60);
  
  /* -- TEXTUROVANÉ SKLO A PRISMATICKÝ LOM -- */
  --glass-border: rgba(255, 255, 255, 0.10);
  --glass-border-highlight: rgba(255, 255, 255, 0.25);
  --glass-specular: linear-gradient(135deg, rgba(255,255,255,0.20) 0%, rgba(255,255,255,0) 50%);
  --blur-layer-1: blur(20px) saturate(180%);
  --blur-layer-2: blur(40px) saturate(210%);
  --blur-layer-float: blur(60px) saturate(250%);

  /* -- TYPOGRAFIE -- */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Plus Jakarta Sans", sans-serif;
  --text-primary: rgba(255, 255, 255, 0.95);
  --text-secondary: rgba(235, 235, 245, 0.65);
  --text-tertiary: rgba(235, 235, 245, 0.40);

  /* -- PROSTOROVÉ STÍNY -- */
  --shadow-spatial-sm: 0 4px 24px -2px rgba(0, 0, 0, 0.5), 0 0 1px 1px var(--glass-border);
  --shadow-spatial-md: 0 12px 40px -4px rgba(0, 0, 0, 0.7), 0 0 1px 1px var(--glass-border-highlight);
  --shadow-spatial-lg: 0 24px 64px -8px rgba(0, 0, 0, 0.85), 0 0 35px -5px var(--ambient-glow);
  
  /* -- FYZIKA ANIMACÍ -- */
  --spring-snappy: cubic-bezier(0.2, 0.8, 0.2, 1);
  --spring-bouncy: cubic-bezier(0.17, 0.89, 0.24, 1.24);
  --transition-smooth: 0.4s var(--spring-snappy);
}

/* ==========================================================================
   ZÁKLADNÍ RESET A NASVÍCENÍ POZADÍ
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-absolute);
  color: var(--text-primary);
  font-family: var(--font-system);
  user-select: none;
  -webkit-user-select: none;
}

/* Radiální přechody generují auru, která prosvětluje skleněná plátna */
body.bg-absolute {
  background-image: 
    radial-gradient(circle at 15% 20%, var(--ambient-glow) 0%, transparent 45%),
    radial-gradient(circle at 85% 80%, rgba(94, 92, 230, 0.15) 0%, transparent 50%);
  background-attachment: fixed;
}

.hidden { display: none !important; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }

/* ==========================================================================
   HLAVNÍ ROZVRŽENÍ (APP VIEWPORT & SIDEBAR)
   ========================================================================== */

.app-viewport {
  display: grid;
  grid-template-columns: 280px 1fr;
  height: 100vh;
  width: 100vw;
  position: relative;
  z-index: 1;
}

.spatial-sidebar {
  background: var(--bg-spatial-1);
  backdrop-filter: var(--blur-layer-2);
  -webkit-backdrop-filter: var(--blur-layer-2);
  border-right: 1px solid var(--glass-border);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px 16px;
  z-index: 10;
  transition: all var(--transition-smooth);
}

.brand-identity {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 12px 24px 12px;
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--ambient-primary), var(--ambient-secondary));
  box-shadow: 0 0 20px var(--ambient-glow);
  display: grid;
  place-items: center;
  font-size: 20px;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #fff 0%, rgba(255,255,255,0.75) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 16px;
  border-radius: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.25s var(--spring-snappy);
  border: 1px solid transparent;
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--bg-spatial-2);
  transform: translateX(4px);
  border-color: var(--glass-border);
  box-shadow: var(--shadow-spatial-sm);
}

.nav-link.active {
  color: #ffffff;
  background: color-mix(in srgb, var(--ambient-primary) 22%, var(--bg-spatial-2));
  border-color: color-mix(in srgb, var(--ambient-primary) 50%, transparent);
  box-shadow: 0 0 25px -5px var(--ambient-glow);
  font-weight: 600;
}

/* -- ZDROJE DAT & STORAGE BAR -- */

.storage-sources-panel {
  padding: 16px 12px;
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  margin: 16px 0;
}

.panel-header {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: 12px;
  font-weight: 600;
}

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

.source-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 6px 8px;
  border-radius: 8px;
  background: rgba(0,0,0,0.2);
}

.source-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.status-green { background: #30d158; box-shadow: 0 0 8px #30d158; }
.status-yellow { background: #ffd60a; box-shadow: 0 0 8px #ffd60a; }

.storage-estimate-box {
  padding: 12px;
  background: var(--bg-spatial-2);
  border-radius: 14px;
  border: 1px solid var(--glass-border);
}

.storage-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.storage-bar-track {
  width: 100%;
  height: 6px;
  background: rgba(0,0,0,0.5);
  border-radius: 3px;
  overflow: hidden;
}

.storage-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--ambient-primary), var(--ambient-secondary));
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* ==========================================================================
   HLAVNÍ PLÁTNO A DYNAMIC ISLAND HEADER
   ========================================================================== */

.library-stage {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow-y: auto;
  padding: 24px 40px;
  gap: 24px;
}

.stage-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 14px 20px;
  background: var(--bg-spatial-1);
  backdrop-filter: var(--blur-layer-float);
  -webkit-backdrop-filter: var(--blur-layer-float);
  border-radius: 20px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-spatial-md);
}

.search-field-wrapper {
  position: relative;
  width: 380px;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 16px;
  font-size: 0.9rem;
  pointer-events: none;
}

.spatial-search-input {
  width: 100%;
  background: rgba(0, 0, 0, 0.45);
  border: 1px solid var(--glass-border);
  padding: 10px 36px 10px 42px;
  border-radius: 99px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  transition: all 0.3s var(--spring-snappy);
}

.spatial-search-input:focus {
  outline: none;
  border-color: var(--ambient-primary);
  background: rgba(0, 0, 0, 0.75);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--ambient-primary) 25%, transparent);
}

.clear-search-btn {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sync-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 99px;
  background: var(--bg-spatial-2);
  border: 1px solid var(--glass-border);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s var(--spring-snappy);
}

.sync-status-pill:hover {
  background: var(--bg-spatial-elevated);
  border-color: var(--glass-border-highlight);
  transform: translateY(-2px);
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #30d158;
  box-shadow: 0 0 10px #30d158;
  animation: spatialPulse 2s infinite ease-in-out;
}

@keyframes spatialPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.6; box-shadow: 0 0 16px #30d158; }
}

.action-btn-primary {
  background: linear-gradient(135deg, var(--ambient-primary), var(--ambient-secondary));
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: 0 4px 16px var(--ambient-glow);
  transition: all 0.25s var(--spring-snappy);
}

.action-btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 20px var(--ambient-primary);
}

.action-btn-secondary {
  background: var(--bg-spatial-2);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  padding: 10px 20px;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
}

.action-btn-secondary:hover {
  background: var(--bg-spatial-elevated);
  border-color: var(--glass-border-highlight);
}

.icon-btn-glass {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: var(--bg-spatial-2);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.2s var(--spring-snappy);
}

.icon-btn-glass:hover {
  background: var(--bg-spatial-elevated);
  transform: scale(1.08);
}

/* ==========================================================================
   PROSTOROVÉ SKLENĚNÉ PANELY (FLOATING ISLANDS) & APPLE PŘEPÍNAČE
   ========================================================================== */

.view-section {
  width: 100%;
  padding-bottom: 120px;
}

.settings-panel-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.glass-card-panel {
  background: rgba(28, 28, 34, 0.55);
  backdrop-filter: blur(45px) saturate(210%);
  -webkit-backdrop-filter: blur(45px) saturate(210%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 28px;
  padding: 28px;
  box-shadow: 
    0 24px 64px -12px rgba(0, 0, 0, 0.85),
    inset 0 1px 1px 0 rgba(255, 255, 255, 0.25);
  transition: transform 0.4s cubic-bezier(0.17, 0.89, 0.24, 1.24), border-color 0.4s ease;
  position: relative;
  overflow: hidden;
}

.glass-card-panel:hover {
  border-color: rgba(10, 132, 255, 0.45);
  transform: translateY(-4px);
  box-shadow: 
    0 32px 80px -16px rgba(0, 0, 0, 0.95),
    0 0 40px -10px rgba(10, 132, 255, 0.2),
    inset 0 1px 1px 0 rgba(255, 255, 255, 0.35);
}

.glass-card-panel h3 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.glass-card-panel p,
.usb-device-details p {
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.92rem;
}

/* -- iOS 26 PROSTOROVÉ PŘEPÍNAČE -- */
.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  margin-top: 12px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.toggle-row:hover { background: rgba(255, 255, 255, 0.04); }
.toggle-row span { font-size: 0.95rem; font-weight: 500; color: rgba(255, 255, 255, 0.9); }

.ios-toggle-input { appearance: none; -webkit-appearance: none; display: none; }

.ios-toggle-slider {
  position: relative;
  width: 54px;
  height: 32px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 99px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: background 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 0.4s ease;
  flex-shrink: 0;
}

.ios-toggle-slider::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  background: #ffffff;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
  transition: transform 0.4s cubic-bezier(0.17, 0.89, 0.24, 1.24), width 0.2s ease;
}

.ios-toggle-input:checked + .ios-toggle-slider {
  background: #30d158;
  border-color: #30d158;
  box-shadow: 0 0 20px -4px rgba(48, 209, 88, 0.6);
}

.ios-toggle-input:checked + .ios-toggle-slider::after { transform: translateX(22px); }
.ios-toggle-slider:active::after { width: 28px; }

/* -- KARTA PŘIPOJENÉHO USB ZAŘÍZENÍ -- */
.usb-device-card {
  background: linear-gradient(135deg, rgba(10, 132, 255, 0.15) 0%, rgba(94, 92, 230, 0.15) 100%);
  border: 1px solid rgba(10, 132, 255, 0.4);
  border-radius: 22px;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  box-shadow: 0 12px 32px -8px rgba(10, 132, 255, 0.25);
}

.usb-device-info { display: flex; align-items: center; gap: 16px; }
.usb-device-icon {
  font-size: 2rem;
  background: rgba(0, 0, 0, 0.3);
  width: 56px; height: 56px;
  border-radius: 16px;
  display: grid; place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.usb-device-details h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }

/* -- SELEKTOR UMÍSTĚNÍ SOUBORU (SEGMENTED CONTROL) -- */
.ios-segmented-control {
  display: flex;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 4px;
  gap: 4px;
  margin-top: 16px;
}

.segment-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: rgba(235, 235, 245, 0.6);
  padding: 10px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.17, 0.89, 0.24, 1.24);
}

.segment-btn.active {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ==========================================================================
   MŘÍŽKA KNIHOVNY A KARTY KNIH
   ========================================================================== */

.books-mesh-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 28px;
}

@media (min-width: 1400px) {
  .books-mesh-grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 36px; }
}

.book-spatial-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  cursor: pointer;
  perspective: 1000px;
}

.book-cover-stage {
  position: relative;
  aspect-ratio: 2 / 3;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.5s var(--spring-bouncy), box-shadow 0.5s var(--spring-bouncy);
  box-shadow: var(--shadow-spatial-sm);
  border: 1px solid var(--glass-border);
  background-color: var(--bg-spatial-2);
}

.book-cover-stage::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--glass-specular);
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
}

.book-spatial-card:hover .book-cover-stage {
  transform: translateY(-8px) rotateX(4deg) rotateY(-4deg);
  box-shadow: var(--shadow-spatial-lg);
  border-color: var(--glass-border-highlight);
}

.book-spatial-card:hover .book-cover-stage::after { opacity: 1; }
.book-cover-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--spring-snappy); }
.book-spatial-card:hover .book-cover-img { transform: scale(1.04); }

.badge-overlay {
  position: absolute;
  top: 10px; right: 10px;
  display: flex; gap: 6px; z-index: 5;
}

.badge-icon {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  display: grid; place-items: center;
  font-size: 12px;
  border: 1px solid var(--glass-border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
}

.book-meta { display: flex; flex-direction: column; gap: 4px; padding: 0 4px; }
.book-title {
  font-size: 1rem; font-weight: 600; color: var(--text-primary);
  line-height: 1.3; display: -webkit-box; -webkit-line-clamp: 1;
  -webkit-box-orient: vertical; overflow: hidden; transition: color 0.2s ease;
}
.book-spatial-card:hover .book-title { color: var(--ambient-primary); }
.book-author { font-size: 0.82rem; color: var(--text-secondary); }

.reading-progress-track {
  width: 100%; height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px; overflow: hidden; margin-top: 4px;
}

.reading-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--ambient-primary), var(--ambient-secondary));
  border-radius: 2px; box-shadow: 0 0 8px var(--ambient-primary);
}

/* ==========================================================================
   ČTECÍ ROZHRANÍ A PLOVOUCÍ AUDIO OSTROV
   ========================================================================== */

.reader-overlay {
  position: fixed; inset: 0; background: var(--bg-absolute); z-index: 100;
  display: flex; flex-direction: column; justify-content: space-between;
  transition: opacity 0.3s ease, transform 0.3s var(--spring-snappy);
}

.reader-header, .reader-footer {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 32px; background: var(--bg-spatial-1);
  backdrop-filter: var(--blur-layer-2); border-bottom: 1px solid var(--glass-border); z-index: 10;
}
.reader-footer { border-bottom: none; border-top: 1px solid var(--glass-border); }
.reader-title { font-weight: 700; font-size: 1.1rem; }
.reader-chapter { font-size: 0.85rem; color: var(--text-secondary); }
.reader-controls { display: flex; gap: 12px; }

.reader-canvas-container {
  flex: 1; width: 100%; height: 100%; overflow: hidden;
  position: relative; display: grid; place-items: center;
}

.epub-target { width: 100%; height: 100%; max-width: 900px; margin: 0 auto; padding: 40px 20px; }
.pdf-target { display: flex; justify-content: center; align-items: center; width: 100%; height: 100%; overflow: auto; }
.pdf-canvas { max-width: 100%; max-height: 100%; box-shadow: var(--shadow-spatial-lg); }

.player-island {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  width: 90%; max-width: 650px; background: var(--bg-spatial-1);
  backdrop-filter: var(--blur-layer-float); -webkit-backdrop-filter: var(--blur-layer-float);
  border: 1px solid var(--glass-border-highlight); border-radius: 24px;
  padding: 12px 20px; box-shadow: var(--shadow-spatial-lg); z-index: 90;
  transition: all 0.5s var(--spring-bouncy);
}

.player-compact-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.player-cover { width: 44px; height: 44px; border-radius: 10px; object-fit: cover; }
.player-info { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.player-title { font-weight: 600; font-size: 0.95rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.player-author { font-size: 0.8rem; color: var(--text-secondary); }
.player-controls { display: flex; align-items: center; gap: 12px; }

.play-btn-primary {
  width: 46px; height: 46px; border-radius: 50%; background: #fff; color: #000;
  border: none; font-size: 1.2rem; display: grid; place-items: center; cursor: pointer;
  box-shadow: 0 0 20px rgba(255,255,255,0.4); transition: transform 0.2s var(--spring-snappy);
}
.play-btn-primary:hover { transform: scale(1.1); }

/* ==========================================================================
   E-INK HARDCORE MODE (ABSOLUTNÍ OVERRIDE)
   ========================================================================== */

body.force-eink-mode,
body.force-eink-mode * {
  transition: none !important; animation: none !important;
  backdrop-filter: none !important; -webkit-backdrop-filter: none !important;
  box-shadow: none !important; text-shadow: none !important;
  border-radius: 0 !important; background-image: none !important;
}

body.force-eink-mode { background-color: #ffffff !important; color: #000000 !important; }
body.force-eink-mode .spatial-sidebar, body.force-eink-mode .stage-header,
body.force-eink-mode .player-island, body.force-eink-mode .reader-header,
body.force-eink-mode .reader-footer, body.force-eink-mode .glass-modal,
body.force-eink-mode .glass-card-panel {
  background: #ffffff !important; border: 2px solid #000000 !important; color: #000000 !important;
}

body.force-eink-mode .nav-link.active, body.force-eink-mode .action-btn-primary {
  background: #000000 !important; color: #ffffff !important;
}
body.force-eink-mode .book-cover-stage {
  filter: grayscale(100%) contrast(150%) !important; border: 1px solid #000000 !important;
}

/* ==========================================================================
   MODÁLNÍ OKNA A RESPONZIVNÍ DOCK
   ========================================================================== */

.modals-container {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(10px); z-index: 200; display: grid; place-items: center;
}

.glass-modal {
  width: 90%; max-width: 480px; background: var(--bg-spatial-1);
  backdrop-filter: var(--blur-layer-2); border: 1px solid var(--glass-border-highlight);
  border-radius: 24px; padding: 24px; box-shadow: var(--shadow-spatial-lg);
}

.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }

@media (max-width: 768px) {
  .app-viewport { grid-template-columns: 1fr; }
  .spatial-sidebar {
    position: fixed; bottom: 0; left: 0; right: 0; height: 74px; width: 100%;
    flex-direction: row; justify-content: space-around; padding: 8px 16px;
    border-right: none; border-top: 1px solid var(--glass-border);
    backdrop-filter: var(--blur-layer-float);
  }
  .brand-identity, .storage-sources-panel, .sidebar-footer { display: none; }
  .nav-list { flex-direction: row; width: 100%; justify-content: space-around; }
  .nav-link span.nav-label { display: none; }
  .nav-link { padding: 10px; font-size: 1.4rem; }
  .library-stage { padding: 16px; padding-bottom: 140px; }
  .stage-header { flex-direction: column; gap: 12px; }
  .search-field-wrapper { width: 100%; }
  .player-island { bottom: 84px; width: 95%; }
}


/* LIGHT MODE OVERRIDES */
html.theme-light {
    --bg-absolute: #ffffff;
    --text-primary: #1a1a1a;
    --panel-bg: #f4f4f4;
    --glass-bg: rgba(255, 255, 255, 0.9);
    --border-color: #e0e0e0;
    --nav-active: #e0e0e0;
    --ambient-primary: #007aff; /* Jasně modrá pro akcenty */
}

/* Úprava čtečky pro světlý režim */
html.theme-light .reader-overlay {
    background-color: #ffffff;
    color: #1a1a1a;
}