@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* Dynamic CSS Theme Variables (Ipak Yuli Bank Design System) */
:root {
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Theme: Dark (Default - Emerald Obsidian) */
  --bg-main: #0D1614;
  --bg-card: rgba(20, 34, 30, 0.8);
  --bg-card-hover: rgba(29, 46, 40, 0.9);
  --bg-control: rgba(20, 34, 30, 0.95);
  --border-color: rgba(0, 204, 158, 0.15);
  --border-focus: rgba(0, 204, 158, 0.5);
  --text-main: #F4F8F6;
  --text-muted: #93A49E;
  --text-title: #ffffff;
  
  /* Ipak Yuli Bank Accents */
  --primary: #00CC9E;
  --primary-glow: rgba(0, 204, 158, 0.4);
  --accent-blue: #0D6F59;
  --accent-emerald: #00CC9E;
  --accent-emerald-glow: rgba(0, 204, 158, 0.3);
  --accent-amber: #F5A623;
  --accent-rose: #F8485E;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 30px rgba(0, 51, 11, 0.3);
  --shadow-lg: 0 15px 50px rgba(0, 51, 11, 0.4);
  --glass-backdrop: blur(12px);
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slide: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.5s ease;
  
  --max-width-content: 900px;
}

/* Light Theme overrides (Ipak Yuli Bank ipakyulibank.uz exact tokens) */
[data-theme="light"] {
  --bg-main: #F9F9F9;
  --bg-card: rgba(237, 239, 238, 0.9);
  --bg-card-hover: rgba(204, 225, 209, 0.95);
  --bg-control: #FFFFFF;
  --border-color: #DAE4DC;
  --border-focus: rgba(23, 63, 53, 0.4);
  --text-main: #173F35;
  --text-muted: #57635F;
  --text-title: #173F35;
  
  --primary: #173F35;
  --primary-glow: rgba(23, 63, 53, 0.15);
  --accent-blue: #0857C3;
  --accent-emerald: #0D6F59;
  --accent-emerald-glow: rgba(13, 111, 89, 0.2);
  
  --shadow-sm: 0 2px 8px rgba(0, 51, 11, 0.05);
  --shadow-md: 0 8px 30px rgba(0, 51, 11, 0.08);
  --shadow-lg: 0 15px 50px rgba(0, 51, 11, 0.12);
}

/* Global resets & scrollbars */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-main);
  color: var(--text-main);
  overflow: hidden !important; /* Always hidden to prevent double scrollbars */
  transition: background-color 0.4s ease, color 0.4s ease;
  line-height: 1.6;
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Layout Containers */
#app-container {
  width: 100vw;
  height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

/* Header styling */
header {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  background-color: rgba(10, 15, 29, 0.7);
  backdrop-filter: var(--glass-backdrop);
  transition: var(--transition-smooth);
  flex-shrink: 0; /* Prevent compression in flexbox */
}

[data-theme="light"] header {
  background-color: rgba(248, 250, 252, 0.8);
}

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

.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent-blue));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 800;
  font-family: var(--font-heading);
  box-shadow: 0 0 15px var(--primary-glow);
}

.logo-text h1 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-title);
  letter-spacing: -0.5px;
}

.logo-text span {
  font-size: 0.75rem;
  color: var(--accent-blue);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  display: block;
}

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

.mode-badge {
  background: rgba(79, 70, 229, 0.1);
  border: 1px solid rgba(79, 70, 229, 0.2);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.icon-btn:hover {
  background: var(--border-color);
  color: var(--text-title);
  border-color: var(--text-muted);
}

/* ----------------- MODE: SLIDES ----------------- */
.slides-view {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  min-height: 0; /* Flexbox constraint to allow scroll inside cards */
}

.slide-viewport {
  width: 100%;
  height: 100%;
  max-width: 980px;
  max-height: 620px;
  position: relative;
  perspective: 1200px;
  min-height: 0; /* Flex constraint */
}

.slide-deck {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
}

.slide-card {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2.5rem;
  opacity: 0;
  pointer-events: none;
  visibility: hidden; /* Hide inactive slides from browser rendering/selection layers */
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transform: scale(0.9) translateZ(-100px);
  transition: var(--transition-slide), visibility 0.5s ease;
  box-shadow: var(--shadow-lg);
  backdrop-filter: var(--glass-backdrop);
  overflow: hidden;
  min-height: 0; /* Prevent flex children from growing indefinitely */
}

/* Slide classes for transitions */
.slide-card.active {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
  transform: scale(1) translateZ(0);
  z-index: 10;
}

.slide-card.prev-slide {
  opacity: 0;
  transform: translateX(-100%) rotateY(-20deg) scale(0.9);
  z-index: 5;
}

.slide-card.next-slide {
  opacity: 0;
  transform: translateX(100%) rotateY(20deg) scale(0.9);
  z-index: 5;
}

/* Inside Slide Card Layout */
.slide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
  flex-shrink: 0; /* Don't compress */
}

.slide-category {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.slide-index {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

.slide-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1.25rem;
  overflow-y: auto;
  padding-right: 0.5rem;
  min-height: 0; /* CRITICAL: allows scrolling when content overflows */
}

.slide-body h2 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-title);
  line-height: 1.25;
  margin-bottom: 0.25rem;
}

.slide-body p {
  font-size: 1.05rem;
  color: var(--text-main);
  line-height: 1.5;
}

.slide-body ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 0.75rem;
}

.slide-body li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.95rem;
  color: var(--text-main);
  line-height: 1.5;
}

.slide-body li::before {
  content: "→";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--accent-blue);
  font-weight: 700;
}

.slide-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-shrink: 0; /* Don't compress */
}

.slide-footer-author {
  font-weight: 500;
}

/* Specialty slide styles */
.slide-card.intro-slide {
  background: linear-gradient(135deg, rgba(16, 22, 42, 0.9) 0%, rgba(10, 15, 29, 0.95) 100%);
  justify-content: center;
  align-items: center;
  text-align: center;
  border: 1px solid rgba(79, 70, 229, 0.25);
}

.slide-card.intro-slide .slide-body {
  align-items: center;
}

.slide-card.intro-slide h2 {
  font-size: 2.5rem;
  background: linear-gradient(135deg, #fff 30%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.75rem;
}

.slide-card.intro-slide p {
  max-width: 600px;
  font-size: 1.15rem;
  color: var(--text-muted);
}

.start-btn {
  background: linear-gradient(135deg, var(--primary), var(--accent-blue));
  color: #fff;
  border: none;
  padding: 0.8rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 9999px;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 0 4px 15px var(--primary-glow);
  margin-top: 1rem;
}

.start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--primary-glow);
}

.slide-card.section-divider {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.15) 0%, rgba(6, 182, 212, 0.1) 100%);
  justify-content: center;
  align-items: center;
  text-align: center;
  border: 1px solid rgba(79, 70, 229, 0.3);
}

.slide-card.section-divider .slide-body {
  align-items: center;
}

.slide-card.section-divider h2 {
  font-size: 2.4rem;
  color: #fff;
}

.divider-badge {
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-blue);
  border: 1px solid rgba(6, 182, 212, 0.3);
  padding: 0.4rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  border-radius: 9999px;
  letter-spacing: 2px;
  margin-bottom: 1rem;
}

/* Nav arrows & keyboard hints */
.slide-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 50;
  box-shadow: var(--shadow-md);
  transition: var(--transition-smooth);
}

.slide-nav-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  box-shadow: 0 0 15px var(--primary-glow);
}

.slide-nav-prev {
  left: 2rem;
}

.slide-nav-next {
  right: 2rem;
}

/* Bottom Bar Controls */
.bottom-controls {
  height: 60px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: rgba(10, 15, 29, 0.8);
  backdrop-filter: var(--glass-backdrop);
  z-index: 100;
  flex-shrink: 0;
}

[data-theme="light"] .bottom-controls {
  background-color: rgba(248, 250, 252, 0.85);
}

.controls-left {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.keyboard-hints {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.key-cap {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  padding: 0.1rem 0.35rem;
  font-family: monospace;
  font-weight: 700;
  color: var(--text-title);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .key-cap {
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.progress-indicator {
  flex: 1;
  max-width: 300px;
  height: 4px;
  background: var(--border-color);
  border-radius: 9999px;
  position: relative;
  overflow: hidden;
  margin: 0 1.5rem;
}

.progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--accent-blue));
  border-radius: 9999px;
  transition: width 0.3s ease;
}

.controls-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ----------------- MODE: LONGREAD ----------------- */
.longread-view {
  flex: 1;
  overflow-y: auto;
  display: none; /* activated in longread mode */
  padding: 2rem 0;
  min-height: 0; /* Flexbox constraint */
}

/* View mode custom behaviors */
.view-longread .bottom-controls {
  display: none !important;
}

.longread-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  display: block; /* default mobile layout */
}

.longread-toc {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.longread-toc h3 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-title);
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toc-item {
  margin: 0;
}

.toc-link {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: var(--transition-smooth);
  display: block;
  padding-left: 0.5rem;
  border-left: 2px solid transparent;
}

.toc-link:hover, .toc-link.active {
  color: var(--accent-blue);
  border-left-color: var(--accent-blue);
  padding-left: 0.75rem;
}

.longread-content article {
  margin-bottom: 4rem;
}

.longread-content h2 {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-title);
  margin-top: 3.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.longread-content h3 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-title);
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.longread-content p {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.longread-content ul, .longread-content ol {
  margin-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.longread-content li {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.longread-content blockquote {
  border-left: 4px solid var(--primary);
  padding: 1rem 1.5rem;
  background: var(--bg-card);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  margin-bottom: 1.5rem;
}

/* Callout Box Component */
.callout {
  padding: 1.25rem 1.5rem;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  position: relative;
}

.callout.info {
  border-left: 4px solid var(--accent-blue);
  background: rgba(6, 182, 212, 0.05);
}

.callout.warning {
  border-left: 4px solid var(--accent-amber);
  background: rgba(245, 158, 11, 0.05);
}

.callout.danger {
  border-left: 4px solid var(--accent-rose);
  background: rgba(244, 63, 94, 0.05);
}

.callout-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.callout.info .callout-title { color: var(--accent-blue); }
.callout.warning .callout-title { color: var(--accent-amber); }
.callout.danger .callout-title { color: var(--accent-rose); }

/* Premium Tables */
.table-wrapper {
  overflow-x: auto;
  margin-bottom: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

th {
  background-color: rgba(16, 22, 42, 0.9);
  color: var(--text-title);
  font-weight: 600;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] th {
  background-color: rgba(0, 0, 0, 0.03);
}

td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  vertical-align: top;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
}

[data-theme="light"] tr:hover td {
  background-color: rgba(0, 0, 0, 0.01);
}

/* ----------------- MODE: GRID VIEW ----------------- */
.grid-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(10, 15, 29, 0.95);
  backdrop-filter: blur(20px);
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  visibility: hidden; /* Hide completely from interaction/selection layer when not active */
  transition: opacity 0.3s ease, visibility 0.3s ease;
  display: flex;
  flex-direction: column;
}

.grid-overlay.active {
  opacity: 1;
  pointer-events: auto;
  visibility: visible;
}

.grid-header {
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 3rem;
  border-bottom: 1px solid var(--border-color);
}

.grid-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-title);
}

.grid-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 3rem;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.grid-thumbnail {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  height: 150px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition-smooth);
}

.grid-thumbnail:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 8px 20px var(--primary-glow);
}

.grid-thumbnail.active {
  border-color: var(--accent-blue);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.3);
}

.thumb-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-title);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.thumb-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* ----------------- INTERACTIVE QUIZ ----------------- */
.quiz-container {
  margin-top: 1rem;
  background: rgba(79, 70, 229, 0.05);
  border: 1px dashed var(--primary);
  border-radius: 16px;
  padding: 1.5rem;
}

.quiz-question {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-title);
  margin-bottom: 1rem;
  line-height: 1.4;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.quiz-option {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.quiz-option:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-muted);
}

.quiz-option.correct {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--accent-emerald);
  color: var(--accent-emerald);
}

.quiz-option.wrong {
  background: rgba(244, 63, 94, 0.15);
  border-color: var(--accent-rose);
  color: var(--accent-rose);
}

.quiz-feedback {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  line-height: 1.4;
  display: none;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
}

.quiz-feedback.show {
  display: block;
}

/* ----------------- GLOSSARY ----------------- */
.glossary-tab {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  margin-top: 3rem;
}

.glossary-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-title);
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.glossary-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

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

.glossary-item h4 {
  font-family: var(--font-heading);
  color: var(--accent-blue);
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.glossary-item p {
  font-size: 0.9rem;
  color: var(--text-main);
  line-height: 1.5;
}

/* Search Box Component */
.search-container {
  position: relative;
  width: 240px;
}

.search-input {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.45rem 1rem 0.45rem 2.2rem;
  font-size: 0.85rem;
  color: var(--text-main);
  outline: none;
  transition: var(--transition-smooth);
}

.search-input:focus {
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 10px var(--primary-glow);
}

.search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.85rem;
  pointer-events: none;
}

.search-results-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  background: var(--bg-control);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: none;
  max-height: 250px;
  overflow-y: auto;
  z-index: 1500;
  box-shadow: var(--shadow-lg);
  margin-top: 0.25rem;
}

.search-result-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.search-result-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.result-category {
  font-size: 0.7rem;
  color: var(--accent-blue);
  text-transform: uppercase;
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.result-title {
  font-size: 0.85rem;
  color: var(--text-title);
  font-weight: 600;
}

.search-no-results {
  padding: 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* View switcher styling */
.view-switch {
  display: flex;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2px;
}

.view-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.view-btn.active {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

/* ----------------- RESPONSIVENESS ADAPTATIONS ----------------- */

/* Grid layout for wide viewports in Longread */
@media (min-width: 1024px) {
  .longread-container {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 3rem;
    max-width: 1200px;
  }
  
  .longread-toc {
    position: sticky;
    top: 100px;
    align-self: start;
    max-height: calc(100vh - 160px);
    overflow-y: auto;
    margin-bottom: 0;
  }
}

/* For laptop/desktop viewports with low height */
@media (max-height: 800px) {
  .slide-viewport {
    max-height: 500px;
  }
  .slide-card {
    padding: 1.75rem 2rem;
  }
  .slide-body {
    gap: 0.75rem;
  }
  .slide-body h2 {
    font-size: 1.65rem;
  }
  .slide-body p {
    font-size: 0.95rem;
  }
  .slide-body li {
    font-size: 0.85rem;
  }
  .quiz-container {
    padding: 1rem;
    margin-top: 0.5rem;
  }
  .quiz-question {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
  }
  .quiz-option {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
  }
}

@media (max-height: 600px) {
  header {
    height: 60px;
  }
  .slide-viewport {
    max-height: 420px;
  }
  .slide-card {
    padding: 1.25rem 1.5rem;
  }
  .slide-body h2 {
    font-size: 1.4rem;
  }
  .slide-body p {
    font-size: 0.85rem;
  }
  .slide-body li {
    font-size: 0.8rem;
  }
  .slide-header {
    margin-bottom: 0.75rem;
  }
  .slide-footer {
    margin-top: 0.75rem;
  }
}

/* Tablet / Mobile Portrait (max-width: 768px) */
@media (max-width: 768px) {
  header {
    padding: 0 1rem;
    height: 60px;
  }
  
  .logo-text span {
    display: none; /* Simplify on mobile */
  }
  
  .logo-text h1 {
    font-size: 0.95rem;
  }
  
  .header-controls {
    gap: 0.5rem;
  }
  
  .mode-badge {
    display: none; /* Remove redundant badge to save space */
  }
  
  .slides-view {
    padding: 1rem;
  }
  
  .slide-viewport {
    height: 100%;
    max-height: 100%; /* Take full vertical space available */
  }
  
  .slide-card {
    padding: 1.5rem;
    border-radius: 14px;
  }
  
  .slide-body h2 {
    font-size: 1.5rem;
  }
  
  .slide-body p {
    font-size: 0.95rem;
  }
  
  .slide-body ul {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .slide-body li {
    font-size: 0.85rem;
  }
  
  .slide-nav-btn {
    display: none; /* Hide arrow buttons, rely on touch swipes */
  }
  
  .keyboard-hints {
    display: none;
  }
  
  .bottom-controls {
    padding: 0 1rem;
    height: 50px;
  }
  
  .progress-indicator {
    margin: 0 0.5rem;
  }
  
  .search-container {
    width: 130px;
  }
  
  .search-input {
    padding: 0.35rem 0.5rem 0.35rem 1.8rem;
    font-size: 0.75rem;
  }
  
  .search-icon {
    font-size: 0.75rem;
    left: 0.5rem;
  }
  
  .grid-scroll {
    padding: 1.5rem;
  }
  
  .grid-container {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
  }
  
  .grid-thumbnail {
    height: 120px;
    padding: 0.75rem;
  }
  
  .thumb-title {
    font-size: 0.75rem;
  }
}