:root {
  --bg: #0b1220;
  --bg-deep: #070c16;
  --card: #0f172a;
  --accent: #60a5fa;
  --accent-2: #38bdf8;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --line: rgba(148, 163, 184, 0.2);
  --nav-safe: clamp(170px, 18vh, 260px);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: radial-gradient(1200px 800px at 20% 10%, #111a2f 0%, var(--bg) 40%, var(--bg-deep) 100%);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.presentation {
  width: 100%;
  height: 100vh;
  position: relative;
}

.slide {
  position: absolute;
  inset: 0;
  padding: 80px 110px calc(var(--nav-safe) + env(safe-area-inset-bottom)) 110px;
  scroll-padding-bottom: calc(var(--nav-safe) + env(safe-area-inset-bottom));
  opacity: 0;
  visibility: hidden;
  transform: none;
  transition: none;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 28px;
  overflow-y: auto;
}

.slide.cover {
  justify-content: center;
}

.slide.centered {
  justify-content: center;
}
.slide.active {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.slide-number {
  position: fixed;
  bottom: 20px;
  right: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: #fff;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 16px;
  border-radius: 12px;
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 100;
  pointer-events: none;
}

/* Typography System */
.slide-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-top: 0;
  padding-bottom: 20px;
  position: relative;
  min-height: 64px;
  color: #fff;
}

.slide-title::after,
.cover .title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 120px;
  background: linear-gradient(90deg, var(--accent) 0%, rgba(56, 189, 248, 0.7) 65%, rgba(56, 189, 248, 0) 100%);
  clip-path: polygon(0 0, 100% 0, 94% 100%, 0 100%);
  box-shadow: 0 0 8px rgba(96, 165, 250, 0.45);
  border-radius: 2px;
}

.cover .title {
  font-size: 3.5rem;
  font-weight: 800;
  margin-top: 10px;
  margin-bottom: 10px;
  letter-spacing: -0.03em;
  line-height: 1.1;
  padding-bottom: 24px;
  position: relative;
  display: inline-block;
}

.cover .title::after {
  left: 50%;
  transform: translateX(-50%);
}

.slide-subtitle {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--muted);
  line-height: 1.5;
}

/* Layout Components */
.divider {
  display: none;
}

.card {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 16px;
  padding: 26px 28px;
  backdrop-filter: blur(10px);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.list {
  list-style: none;
  display: grid;
  gap: 16px;
}

.list li {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text);
  padding-left: 28px;
  position: relative;
}

.list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(96, 165, 250, 0.6);
}

.list li strong {
  color: var(--accent);
  font-weight: 600;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.metric-card {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
  backdrop-filter: blur(10px);
}

.metric-value {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Blocks */
.arch-diagram {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 16px;
  padding: 24px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--muted);
  white-space: pre;
  overflow-x: auto;
}

.arch-diagram .hl {
  color: var(--accent);
}

.reflexion {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text);
}

.reflexion p {
  margin-bottom: 1.2rem;
}

.reflexion strong {
  color: var(--accent);
  font-weight: 700;
}

/* Cover Styling */
.cover {
  text-align: center;
  align-items: center;
}

.cover .title::after {
  left: 50%;
  transform: translateX(-50%);
}

.cover .meta {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.cover .byline {
  font-size: 1rem;
  color: var(--muted);
  opacity: 0.8;
  margin-top: 20px;
}


/* Link */
.link-box {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 24px;
  background: rgba(96, 165, 250, 0.1);
  border: 1px solid rgba(96, 165, 250, 0.3);
  border-radius: 12px;
  text-decoration: none;
  transition: all 0.2s ease;
}

.link-box:hover {
  background: rgba(96, 165, 250, 0.2);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.link-box .url {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
}

/* Navigation */
.nav-controls {
  position: fixed;
  right: 26px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 10;
}

.nav-btn {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.7);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.hint {
  display: none;
}

/* Scrollable Slide Support */
.slide.scrollable {
  display: block;
  overflow-y: auto;
}

.scroll-container {
  padding-bottom: 60px;
}

@media (max-width: 1100px) {
  .slide {
    padding: 60px 60px 100px 60px;
  }
  .cover .title {
    font-size: 2.8rem;
  }
  .slide-title {
    font-size: 2.1rem;
  }
  .list li {
    font-size: 1rem;
  }
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* =========================================
   TABLET (≤ 768px)
   ========================================= */
@media (max-width: 768px) {
  :root {
    --nav-safe: clamp(120px, 15vh, 160px);
  }

  body {
    overflow-y: auto;
    height: auto;
  }

  .presentation {
    height: auto;
    min-height: 100vh;
  }

  /* Slides: de posición absolute a flujo normal en móvil */
  .slide {
    position: relative;
    display: none;
    padding: 24px 18px 130px 18px;
    opacity: 1;
    visibility: visible;
    transform: none;
    height: auto;
    min-height: 100vh;
    overflow-y: visible;
    gap: 18px;
  }

  .slide.active {
    display: flex;
  }

  .slide.cover {
    justify-content: center;
    min-height: 100vh;
  }

  /* Tipografía */
  .cover .title {
    font-size: 2rem;
  }

  .slide-title {
    font-size: 1.5rem;
    min-height: auto;
    padding-bottom: 12px;
  }

  .slide-subtitle {
    font-size: 1rem;
  }

  .cover .meta {
    font-size: 0.7rem;
  }

  .cover .byline {
    font-size: 0.85rem;
    margin-top: 12px;
  }

  /* Cards */
  .card {
    padding: 16px 14px;
  }

  .card-title {
    font-size: 0.85rem;
    margin-bottom: 12px;
    padding-bottom: 10px;
  }

  /* Listas */
  .list {
    gap: 10px;
  }

  .list li {
    font-size: 0.9rem;
    padding-left: 20px;
    line-height: 1.5;
  }

  /* Grids: siempre 1 columna en móvil */
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* Metric cards */
  .metric-value {
    font-size: 2rem;
  }

  .metric-card {
    padding: 16px;
  }

  /* Diagrama de arquitectura */
  .arch-diagram {
    font-size: 0.7rem;
    padding: 14px;
    white-space: pre-wrap;
    word-break: break-word;
    overflow-x: hidden;
  }

  /* Link boxes */
  .link-box {
    padding: 10px 14px;
    word-break: break-all;
  }

  .link-box .url {
    font-size: 0.75rem;
  }

  /* Slide number */
  .slide-number {
    bottom: 95px;
    right: 14px;
    font-size: 0.65rem;
    padding: 6px 10px;
    z-index: 1100;
  }

  /* Navegación: mover al inferior, hacerla horizontal */
  .nav-controls {
    position: fixed;
    right: auto;
    top: auto;
    bottom: 16px;
    left: 0;
    right: 0;
    transform: none;
    flex-direction: row;
    justify-content: center;
    gap: 12px;
    z-index: 1000;
    background: rgba(7, 12, 22, 0.85);
    backdrop-filter: blur(12px);
    padding: 10px 20px;
    border-top: 1px solid rgba(255,255,255,0.08);
  }

  .nav-btn {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
    border-radius: 14px;
  }

  /* Reflexión */
  .reflexion {
    font-size: 0.9rem;
    line-height: 1.7;
  }
}

/* =========================================
   MÓVIL PEQUEÑO (≤ 480px)
   ========================================= */
@media (max-width: 480px) {
  .slide {
    padding: 20px 14px 130px 14px;
    gap: 14px;
  }

  .cover .title {
    font-size: 1.6rem;
  }

  .slide-title {
    font-size: 1.25rem;
  }

  .metric-value {
    font-size: 1.7rem;
  }

  .list li {
    font-size: 0.85rem;
  }

  .card {
    padding: 12px 10px;
  }

  .nav-btn {
    width: 46px;
    height: 46px;
    font-size: 1.1rem;
  }
}