/* Linear / Notion Minimalist Engineer Slide Theme (No AI Glow / No Generic Emojis) */
:root {
  --bg-main: #0c0d10;
  --bg-card: #14161c;
  --bg-card-hover: #1a1d26;
  --border-color: #272a35;
  --accent-blue: #3b82f6;
  --accent-emerald: #10b981;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-tertiary: #6b7280;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --slide-width: 1200px;
  --slide-height: 675px; /* Standard 16:9 ratio */
  --transition-speed: 0.3s;
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  display: flex;
  flex-direction: column;
}

/* Minimalist Top Header */
header {
  height: 56px;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-main);
  z-index: 100;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.brand-title {
  color: var(--text-primary);
  font-weight: 600;
}

.brand-divider {
  color: var(--text-tertiary);
}

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

.btn {
  background: #181a20;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn:hover {
  background: #222530;
  color: var(--text-primary);
  border-color: #3f4455;
}

.btn-accent {
  background: var(--text-primary);
  color: var(--bg-main);
  border: none;
  font-weight: 600;
}

.btn-accent:hover {
  background: #ffffff;
  color: #000;
}

/* Viewport & Slide Container */
.presentation-viewport {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
  position: relative;
}

.slide-deck {
  width: min(100%, var(--slide-width));
  height: min(100%, var(--slide-height));
  position: relative;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2.75rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-speed) ease, transform var(--transition-speed) ease, visibility var(--transition-speed);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Slide Typography & Headers */
.slide-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.slide-num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-blue);
  font-weight: 600;
  letter-spacing: 1px;
}

.slide-category {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.slide-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  line-height: 1.25;
}

.slide-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 0.35rem;
  font-weight: 400;
}

/* Content Area Layouts */
.slide-content {
  flex: 1;
  margin: 1.5rem 0 1rem 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Editorial Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

/* Minimalist Content Cards */
.card {
  background: #101217;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.company-tag {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  background: #1e222e;
  color: var(--text-secondary);
  border: 1px solid #2d3345;
}

.company-tag-active {
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent-blue);
  border-color: rgba(59, 130, 246, 0.3);
}

/* Clean Bullet Lists */
ul.clean-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

ul.clean-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

ul.clean-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--text-tertiary);
}

ul.clean-list li strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* Highlight Block for Principles */
.highlight-panel {
  background: #121622;
  border-left: 3px solid var(--accent-blue);
  border-radius: 0 8px 8px 0;
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.highlight-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 0.4rem;
}

.highlight-body {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Horizontal Timeline Layout for Slide 5 */
.timeline-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.timeline-step {
  background: #101217;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
}

.step-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-blue);
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.step-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

/* Minimal Table Layout for Adaptability Slide */
.table-container {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
}

.table-container th {
  text-align: left;
  padding: 0.6rem 0.8rem;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-color);
}

.table-container td {
  padding: 0.75rem 0.8rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  vertical-align: top;
}

.table-container td strong {
  color: var(--text-primary);
}

/* Footer Info */
.slide-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  padding-top: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Presenter Notes Drawer */
.notes-drawer {
  position: fixed;
  bottom: 60px;
  left: 50%;
  transform: translateX(-50%);
  width: min(92%, 900px);
  background: #141720;
  border: 1px solid #3b82f6;
  border-radius: 8px;
  padding: 1rem 1.25rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
  z-index: 90;
  display: none;
}

.notes-drawer.open {
  display: block;
}

.notes-header {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-blue);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 0.4rem;
}

.notes-text {
  font-size: 0.88rem;
  color: #e5e7eb;
  line-height: 1.6;
}

/* Bottom Navigation Bar */
.nav-footer {
  height: 56px;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-color);
  background: var(--bg-main);
  z-index: 100;
}

.slide-dots {
  display: flex;
  gap: 0.4rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #272a35;
  cursor: pointer;
  transition: all 0.2s ease;
}

.dot.active {
  background: var(--accent-blue);
  transform: scale(1.2);
}

/* Print CSS */
@media print {
  body {
    overflow: visible;
    background: #fff;
    color: #000;
  }
  header, nav, .notes-drawer { display: none !important; }
  .slide {
    position: relative;
    opacity: 1 !important;
    visibility: visible !important;
    transform: none !important;
    page-break-after: always;
    background: #fff;
    color: #000;
    border: 1px solid #ccc;
    box-shadow: none;
    margin-bottom: 2rem;
  }
}