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

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --accent-primary: #f59e0b;
  --accent-secondary: #8b5cf6;
  --accent-tertiary: #06b6d4;
  --border-color: #334155;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  height: 100vh;
  line-height: 1.6;
}

.presentation-container {
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* Progress Bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--bg-secondary);
  z-index: 1000;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: width 0.3s ease;
  width: 6.67%;
}

/* Slide Counter */
.slide-counter {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background: var(--bg-secondary);
  padding: 0.75rem 1.5rem;
  border-radius: 2rem;
  font-weight: 600;
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  border: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.separator {
  margin: 0 0.5rem;
  color: var(--text-muted);
}

/* Slides */
.slide {
  display: none;
  width: 100%;
  height: 100vh;
  padding: 5rem 2rem 8rem;
  overflow-y: auto;
}

.slide.active {
  display: block;
  animation: slideIn 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.slide-content {
  max-width: 1200px;
  margin: 0 auto;
}

/* Slide Header */
.slide-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.slide-number {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: rgba(245, 158, 11, 0.1);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.slide-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

/* Title Slide */
.title-slide {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  height: calc(100vh - 13rem);
}

.title-badge {
  display: inline-block;
  background: rgba(139, 92, 246, 0.1);
  color: var(--accent-secondary);
  padding: 0.5rem 1.5rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 2rem;
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.main-title {
  font-size: 5rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
  line-height: 1.1;
}

.subtitle {
  font-size: 1.5rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin-bottom: 3rem;
  line-height: 1.6;
}

.title-meta {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  justify-content: center;
}

.meta-item {
  font-size: 1rem;
  color: var(--text-muted);
  padding: 0.75rem 1.5rem;
  background: var(--bg-secondary);
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
}

/* Typography */
h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.intro-text {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  font-size: 1.125rem;
  color: var(--text-secondary);
  padding: 0.5rem 0;
  padding-left: 1.5rem;
  position: relative;
}

li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: 700;
}

/* Grids */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

/* Cards */
.feature-card,
.notification-card,
.config-card {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.feature-card:hover,
.notification-card:hover,
.config-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--accent-primary);
}

.card-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.tech-stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.tech-card {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.tech-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.tech-card:hover::before {
  transform: scaleX(1);
}

.tech-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.tech-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

/* Highlight Boxes */
.highlight-box,
.definition-box {
  background: rgba(139, 92, 246, 0.1);
  border-left: 4px solid var(--accent-secondary);
  padding: 2rem;
  border-radius: 0.75rem;
  margin: 2rem 0;
}

.warning-card {
  background: rgba(245, 158, 11, 0.1);
  border-left: 4px solid var(--accent-primary);
  padding: 2rem;
  border-radius: 0.75rem;
}

.important-box {
  display: flex;
  gap: 1.5rem;
  background: rgba(239, 68, 68, 0.1);
  border-left: 4px solid #ef4444;
  padding: 2rem;
  border-radius: 0.75rem;
  margin: 2rem 0;
}

.important-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.tip-box {
  background: rgba(6, 182, 212, 0.1);
  border-left: 4px solid var(--accent-tertiary);
  padding: 1.5rem;
  border-radius: 0.75rem;
  margin: 2rem 0;
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* Stats Row */
.stats-row {
  display: flex;
  gap: 2rem;
  margin: 3rem 0;
  flex-wrap: wrap;
}

.stat-item {
  flex: 1;
  min-width: 200px;
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  text-align: center;
}

.stat-value {
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Steps */
.section-group {
  margin: 2rem 0;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0;
}

.step-item {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.step-item:hover {
  border-color: var(--accent-primary);
  transform: translateX(8px);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--accent-primary);
  color: var(--bg-primary);
  border-radius: 50%;
  font-weight: 700;
  font-size: 1.125rem;
  flex-shrink: 0;
}

/* Flow Diagram */
.flow-diagram {
  background: var(--bg-secondary);
  padding: 3rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  margin: 2rem 0;
}

.flow-diagram h3 {
  text-align: center;
  margin-bottom: 2.5rem;
  font-size: 1.75rem;
}

.flow-container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--bg-tertiary);
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  min-width: 180px;
}

.flow-icon {
  font-size: 2rem;
}

.flow-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  text-align: center;
  font-weight: 500;
}

.flow-arrow {
  font-size: 2rem;
  color: var(--accent-primary);
  font-weight: 700;
}

.flow-result {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}

.result-item {
  flex: 1;
  min-width: 250px;
  padding: 2rem;
  border-radius: 1rem;
  text-align: center;
}

.result-item.platform {
  background: rgba(245, 158, 11, 0.1);
  border: 2px solid var(--accent-primary);
}

.result-item.designer {
  background: rgba(139, 92, 246, 0.1);
  border: 2px solid var(--accent-secondary);
}

.result-amount {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.result-item.platform .result-amount {
  color: var(--accent-primary);
}

.result-item.designer .result-amount {
  color: var(--accent-secondary);
}

.result-label {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Code Blocks */
.code-section {
  margin: 2rem 0;
}

.code-section h3 {
  margin-bottom: 1rem;
}

pre {
  background: #1e1e1e;
  padding: 2rem;
  border-radius: 0.75rem;
  overflow-x: auto;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
}

code {
  font-family: "Monaco", "Menlo", "Ubuntu Mono", monospace;
  font-size: 0.95rem;
  line-height: 1.7;
  color: #d4d4d4;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 3rem;
  margin: 2rem 0;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 1rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-primary), var(--accent-secondary));
}

.timeline-item {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
  position: relative;
}

.timeline-marker {
  position: absolute;
  left: -2.5rem;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--accent-primary);
  color: var(--bg-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.95rem;
  border: 3px solid var(--bg-primary);
  z-index: 1;
}

.timeline-content {
  background: var(--bg-secondary);
  padding: 1.25rem 1.75rem;
  border-radius: 0.75rem;
  border: 1px solid var(--border-color);
  flex: 1;
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* Architecture Diagram */
.architecture-diagram {
  background: var(--bg-secondary);
  padding: 3rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  margin: 2rem 0;
}

.architecture-diagram h3 {
  text-align: center;
  margin-bottom: 2.5rem;
}

.arch-layer {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.arch-layer.services {
  flex-wrap: wrap;
}

.arch-box {
  padding: 1.5rem 2.5rem;
  border-radius: 0.75rem;
  font-weight: 600;
  text-align: center;
  border: 2px solid;
}

.arch-box.frontend {
  background: rgba(139, 92, 246, 0.1);
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}

.arch-box.backend {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.arch-box.database {
  background: rgba(6, 182, 212, 0.1);
  border-color: var(--accent-tertiary);
  color: var(--accent-tertiary);
}

.arch-box.service {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-secondary);
  padding: 1rem 1.5rem;
}

.arch-arrow {
  text-align: center;
  font-size: 2rem;
  color: var(--accent-primary);
  font-weight: 700;
  margin: 0.5rem 0;
}

/* Roadmap */
.roadmap {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.phase-card {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  border: 2px solid;
  transition: all 0.3s ease;
}

.phase-card.phase-1 {
  border-color: var(--accent-primary);
}

.phase-card.phase-2 {
  border-color: var(--accent-secondary);
}

.phase-card.phase-3 {
  border-color: var(--accent-tertiary);
}

.phase-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.phase-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.phase-badge {
  background: var(--accent-primary);
  color: var(--bg-primary);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 700;
}

.phase-card.phase-2 .phase-badge {
  background: var(--accent-secondary);
}

.phase-card.phase-3 .phase-badge {
  background: var(--accent-tertiary);
}

.phase-duration {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* Concepts & Costs */
.concepts-section,
.costs-section {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
}

.concept-item {
  padding: 1.5rem;
  background: var(--bg-tertiary);
  border-radius: 0.75rem;
  margin-bottom: 1rem;
}

.concept-item strong {
  display: block;
  color: var(--accent-primary);
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.concept-item p {
  margin: 0;
  font-size: 1rem;
}

.cost-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem;
  background: var(--bg-tertiary);
  border-radius: 0.75rem;
  margin-bottom: 1rem;
}

.cost-item.highlight {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid var(--accent-primary);
}

.cost-service {
  font-weight: 600;
  color: var(--text-primary);
}

.cost-amount {
  font-weight: 700;
  color: var(--accent-primary);
  font-size: 1.125rem;
}

.final-tip {
  background: rgba(6, 182, 212, 0.1);
  border-left: 4px solid var(--accent-tertiary);
  padding: 2rem;
  border-radius: 0.75rem;
  margin-top: 3rem;
}

/* Controls */
.controls {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 1rem;
  z-index: 100;
}

.btn {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 3rem;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-lg);
}

.btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.btn svg {
  transition: transform 0.3s ease;
}

.btn-prev:hover svg {
  transform: translateX(-4px);
}

.btn-next:hover svg {
  transform: translateX(4px);
}

/* Scrollbar */
.slide::-webkit-scrollbar {
  width: 8px;
}

.slide::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

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

.slide::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* Footer Logo */
.footer-logo {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 50;
}

.footer-logo img {
  width: 75px;
  height: 60px;
  opacity: 0.9;
  transition: opacity 0.3s ease;
}

.footer-logo img:hover {
  opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
  .main-title {
    font-size: 3rem;
  }

  .subtitle {
    font-size: 1.25rem;
  }

  .slide-header h2 {
    font-size: 2rem;
  }

  .slide {
    padding: 4rem 1.5rem 7rem;
  }

  .slide-counter {
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }

  .controls {
    bottom: 1rem;
    gap: 0.5rem;
  }

  .btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
  }

  .grid-2,
  .tech-stack-grid,
  .roadmap {
    grid-template-columns: 1fr;
  }

  .flow-container {
    flex-direction: column;
  }

  .flow-arrow {
    transform: rotate(90deg);
  }

  .title-meta {
    flex-direction: column;
    gap: 1rem;
  }

  .footer-logo {
    bottom: 1rem;
    right: 1rem;
  }

  .footer-logo img {
    width: 32px;
    height: 32px;
  }
}