/* ==========================================================================
   LANDSCAPE PRESENTATION DECK — MINIMALIST REFERENCE DESIGN SYSTEM
   Font: Space Grotesk | Strict Landscape 16:9 Stage
   ========================================================================== */

:root {
  /* Light Theme (Reference Default) */
  --bg-app: #ffffff;
  --bg-stage: #ffffff;
  --bg-hover: #f3f4f6;
  --border-subtle: #e5e7eb;
  --border-medium: #d1d5db;
  --border-focus: #111827;

  --text-main: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;

  --badge-bg: #f3f4f6;
  --badge-text: #1f2937;
  --accent-color: #0284c7;

  --font-sans: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --zoom-scale: 1;
  --content-font-scale: 1;
}

/* Dark Theme */
body.dark-mode {
  --bg-app: #09090b;
  --bg-stage: #09090b;
  --bg-hover: #27272a;
  --border-subtle: #27272a;
  --border-medium: #3f3f46;
  --border-focus: #fafafa;

  --text-main: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --text-faint: #52525b;

  --badge-bg: #27272a;
  --badge-text: #e4e4e7;
  --accent-color: #38bdf8;
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  user-select: none;
}

/* App Container */
.presentation-app {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  position: relative;
}

/* ==========================================================================
   1. SLIM TOP HEADER (OPTIMIZED FOR PRESENTATION ASPECT RATIO)
   ========================================================================== */
.deck-header {
  height: 48px;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-app);
  z-index: 50;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
}

.chapter-label {
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
}

.chapter-divider {
  color: var(--border-medium);
  font-weight: 300;
}

.chapter-title {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 520px;
}

/* Header Function Buttons */
.header-right {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.control-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  height: 32px;
  padding: 0 0.85rem;
  background-color: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

.control-pill:hover {
  background-color: var(--badge-bg);
  border-color: var(--border-medium);
  color: var(--text-main);
}

.control-pill.active {
  background-color: var(--badge-bg);
  border-color: var(--border-focus);
  color: var(--text-main);
  font-weight: 600;
}

.control-pill kbd {
  color: var(--text-muted);
  font-size: 0.66rem;
  font-weight: 600;
}

.control-pill svg {
  width: 13px;
  height: 13px;
  stroke-width: 2.2;
}

/* Font Size & Zoom Widget */
.zoom-widget {
  display: flex;
  align-items: center;
  height: 30px;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  overflow: hidden;
  background-color: transparent;
}

.zoom-btn {
  width: 26px;
  height: 100%;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.12s;
}

.zoom-btn:hover {
  background-color: var(--badge-bg);
  color: var(--text-main);
}

.zoom-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-main);
  padding: 0 0.55rem;
  min-width: 68px;
  text-align: center;
  font-weight: 600;
  cursor: pointer;
}

/* ==========================================================================
   2. PRESENTATION STAGE (STRICTLY CENTERED & ENLARGED PRESENTATION SCALE)
   ========================================================================== */
.presentation-viewport {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 2.5rem;
  position: relative;
  overflow: hidden;
  background-color: var(--bg-app);
}

/* Strictly Centered Presentation Stage — Left-aligned text within expanded widescreen frame */
.slide-canvas {
  width: min(1380px, 94vw);
  max-width: 1380px;
  max-height: min(740px, calc(100vh - 110px));
  margin: auto;
  background: transparent;
  border: none;
  border-radius: 0;
  box-shadow: none;
  transform: scale(var(--zoom-scale));
  transform-origin: center center;
  transition: transform 0.2s ease, opacity 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  text-align: left;
  padding: 1rem 0;
  position: relative;
  overflow-y: auto;
}

/* Hide scrollbars for clean presentation aesthetics */
.slide-canvas::-webkit-scrollbar {
  display: none;
}
.slide-canvas {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

/* Slide Content Typography with Large Presentation Font Scale */
.slide-eyebrow {
  font-family: var(--font-mono);
  font-size: calc(0.95rem * var(--content-font-scale));
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.85rem;
  text-align: left;
  margin-left: 0;
  margin-right: auto;
}

.slide-heading {
  font-family: var(--font-heading);
  font-size: calc(clamp(2.25rem, 3.4vw, 3.2rem) * var(--content-font-scale));
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-main);
  letter-spacing: -0.025em;
  margin-bottom: 0.85rem;
  text-align: left;
  margin-left: 0;
  margin-right: auto;
  max-width: 100%;
  width: 100%;
  text-wrap: balance;
}

.slide-synopsis {
  font-family: var(--font-sans);
  font-size: calc(clamp(1.12rem, 1.45vw, 1.32rem) * var(--content-font-scale));
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 1.85rem;
  max-width: 100%;
  width: 100%;
  text-align: left;
  margin-left: 0;
  margin-right: auto;
  text-wrap: pretty;
}

/* Content Blocks — Strictly Left-Aligned Flow */
.slide-cards-stack {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  gap: 1.5rem;
  width: 100%;
  flex-grow: 1;
  justify-content: flex-start;
  overflow-y: auto;
  padding: 0 0.5rem 0 0;
}

.slide-cards-stack::-webkit-scrollbar {
  width: 4px;
}

.slide-cards-stack::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}

/* Seamless Content Section (Left-Aligned, Wide Layout & Orphan-Free) */
.ref-box {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0.25rem 0;
  width: 100%;
  text-align: left;
}

.ref-box-title {
  font-family: var(--font-heading);
  font-size: calc(1.35rem * var(--content-font-scale));
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  text-align: left;
  gap: 0.75rem;
  width: 100%;
}

.ref-box-badge {
  font-family: var(--font-mono);
  font-size: calc(0.8rem * var(--content-font-scale));
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  background-color: var(--badge-bg);
  color: var(--accent-color);
  border-radius: 4px;
  text-transform: uppercase;
}

.ref-box-desc {
  font-family: var(--font-sans);
  font-size: calc(1.15rem * var(--content-font-scale));
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 100%;
  width: 100%;
  margin-left: 0;
  margin-right: auto;
  text-align: left;
  text-wrap: pretty;
}

.ref-box-desc strong {
  color: var(--text-main);
}

/* Matrix Table Specific Styling inside Slide 9 (Left-Aligned, Wide) */
.slide-matrix-table {
  width: 100%;
  max-width: 100%;
  margin: 0.5rem 0;
  border-collapse: collapse;
  font-size: calc(0.95rem * var(--content-font-scale));
}

.slide-matrix-table th, .slide-matrix-table td {
  padding: 0.75rem 0.95rem;
  border: 1px solid var(--border-subtle);
  text-align: left;
  vertical-align: top;
  line-height: 1.45;
}

.slide-matrix-table th {
  background-color: var(--badge-bg);
  font-weight: 700;
  font-family: var(--font-heading);
  text-align: left;
}

.slide-matrix-table td:first-child {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-color);
  width: 18%;
  text-align: left;
}

/* Q&A List inside Slide 12 (Left-Aligned, Wide & Orphan-Free) */
.slide-qna-grid {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
  width: 100%;
  max-width: 100%;
  margin: 0;
}

.qna-card-mini {
  background: transparent;
  border: none;
  padding: 0.25rem 0;
  text-align: left;
  width: 100%;
}

.qna-card-mini h5 {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.4rem;
  font-size: calc(1.22rem * var(--content-font-scale));
  text-align: left;
  max-width: 100%;
}

.qna-card-mini p {
  font-family: var(--font-sans);
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: calc(1.08rem * var(--content-font-scale));
  text-align: left;
  max-width: 100%;
  width: 100%;
  margin: 0;
  text-wrap: pretty;
}

/* ==========================================================================
   3. SLIM BOTTOM FOOTER (PRESENTATION DETAILS & NAVIGATION)
   ========================================================================== */
.deck-footer {
  height: 46px;
  min-height: 46px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-app);
  z-index: 50;
  font-size: 0.88rem;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.84rem;
}

.slide-index-counter strong {
  color: var(--text-main);
  font-weight: 700;
}

.footer-divider {
  color: var(--border-medium);
}

.footer-section-tag {
  color: var(--text-secondary);
  font-weight: 500;
}

.footer-center {
  font-family: var(--font-sans);
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  text-align: center;
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.nav-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  height: 32px;
  padding: 0 0.95rem;
  background-color: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.12s ease;
}

.nav-pill:hover:not(:disabled) {
  background-color: var(--badge-bg);
  border-color: var(--border-medium);
  color: var(--text-main);
}

.nav-pill:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.nav-pill kbd {
  color: var(--text-muted);
  font-size: 0.68rem;
}

/* ==========================================================================
   4. SLIDE INDEX MODAL — SINGLE COLUMN ROW FORMAT
   ========================================================================== */
.index-modal {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.index-modal.open {
  opacity: 1;
  pointer-events: auto;
}

.index-dialog {
  width: min(680px, 92vw);
  max-height: 82vh;
  background-color: var(--bg-stage);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  box-shadow: var(--stage-shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(8px);
  transition: transform 0.2s ease;
}

.index-modal.open .index-dialog {
  transform: translateY(0);
}

.index-header {
  padding: 0.9rem 1.4rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.index-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
}

.drawer-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
}

.drawer-close-btn:hover {
  color: var(--text-main);
}

/* Single Column Row Format */
.index-list-rows {
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  overflow-y: auto;
}

.index-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 0.95rem;
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  cursor: pointer;
  background-color: transparent;
  transition: all 0.12s ease;
  text-decoration: none;
}

.index-row:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-medium);
}

.index-row.active {
  border-color: var(--accent-color);
  background-color: var(--badge-bg);
}

.index-row-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.index-row-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent-color);
  min-width: 58px;
}

.index-row-title {
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
}

.index-row-chapter {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ==========================================================================
   5. MOBILE STRICT LANDSCAPE ROTATE PROMPT
   ========================================================================== */
.rotate-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: var(--bg-app);
  z-index: 9999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
}

.rotate-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 1.2rem;
  animation: rotatePhone 2.5s infinite ease-in-out;
  color: var(--accent-color);
}

@keyframes rotatePhone {
  0%, 15% { transform: rotate(0deg); }
  50%, 65% { transform: rotate(-90deg); }
  100% { transform: rotate(0deg); }
}

.rotate-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.rotate-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 320px;
  line-height: 1.5;
  margin-bottom: 1.25rem;
}

.rotate-bypass-btn {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  background: var(--badge-bg);
  color: var(--text-muted);
  cursor: pointer;
}

@media (max-width: 768px) and (orientation: portrait) {
  body:not(.bypass-landscape) .rotate-overlay {
    display: flex;
  }
}

@media (max-width: 900px) {
  .chapter-title {
    max-width: 220px;
  }
  .slide-canvas {
    padding: 1.5rem 2rem;
  }
  .slide-heading {
    font-size: 1.45rem;
  }
}

/* ==========================================================================
   4. EXPLANATION REDUCED / FULL MODE STYLES & TOAST NOTIFICATION
   ========================================================================== */
.mode-toast {
  position: fixed;
  top: 58px;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background: var(--text-main);
  color: var(--bg-app);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.5rem 1.25rem;
  border-radius: 9999px;
  box-shadow: 0 10px 30px -5px rgba(0, 0, 0, 0.25), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.mode-toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Reduced Mode Visual Indicators */
body.reduced-mode #btn-mode {
  border-color: var(--accent-color);
  color: var(--accent-color);
  background-color: var(--badge-bg);
}

body.reduced-mode #btn-mode #mode-label {
  color: var(--accent-color);
  font-weight: 700;
}

body.reduced-mode .ref-box-desc {
  font-size: calc(1.16rem * var(--content-font-scale));
  line-height: 1.7;
  max-width: 100%;
  width: 100%;
  text-wrap: pretty;
}

body.reduced-mode .slide-synopsis {
  color: var(--text-main);
  font-weight: 500;
  max-width: 100%;
  width: 100%;
  text-wrap: pretty;
}