*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #0d0d0d;
  --surface: #111111;
  --border: #1e1e1e;
  --text: #c8c8c8;
  --bright: #e8e8e8;
  --muted: #666666;
  --dim: #3a3a3a;
  --accent: #7eb8f7;
  --accent2: #f0a060;
  --green: #6fcf7a;
  --font: 'IBM Plex Mono', 'Courier New', monospace;
}

html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  height: 100%;
  overflow: hidden;
}

.deck {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
}

.topbar {
  height: 38px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
  position: relative;
  z-index: 100;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  color: var(--muted);
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.topbar-logo {
  width: 24px;
  height: 24px;
  display: block;
  opacity: 0.85;
  transition: opacity 0.15s;
}

.logo-link:hover .topbar-logo { opacity: 1; }

.topbar-label {
  font-size: 11px;
  color: var(--muted);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 11px;
  color: var(--muted);
}


.slide-counter { color: var(--accent2); }

.btn-fullscreen {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--font);
  font-size: 11px;
  padding: 3px 10px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.btn-fullscreen:hover {
  color: var(--bright);
  border-color: var(--dim);
}

.slide-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px;
  overflow: hidden;
}

.slide {
  display: none;
  max-width: 860px;
  width: 100%;
  animation: fadeIn 0.2s ease;
}

.slide.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.slide-tag {
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.slide-tag .num { color: var(--accent2); margin-right: 8px; }

h1.slide-title {
  font-size: 28px;
  font-weight: 400;
  color: var(--bright);
  margin: 0 0 8px;
  line-height: 1.3;
}

h2.slide-title {
  font-size: 20px;
  font-weight: 400;
  color: var(--bright);
  margin: 0 0 28px;
  line-height: 1.4;
}

.slide-subtitle {
  font-size: 13px;
  color: var(--muted);
  margin: 0 0 40px;
}

.slide-body {
  font-size: 13px;
  line-height: 1.9;
  color: var(--text);
}

.slide-body pre {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 20px 24px;
  font-family: var(--font);
  font-size: 12px;
  line-height: 1.8;
  color: var(--text);
  overflow-x: auto;
  white-space: pre;
}

.hl  { color: var(--accent); }
.hl2 { color: var(--accent2); }
.hlg { color: var(--green); }
.dim { color: var(--muted); }

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.col-label {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.tag {
  font-size: 11px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  color: var(--muted);
}

.tag.blue  { border-color: #2a4a6e; color: var(--accent); }
.tag.amber { border-color: #5e3c10; color: var(--accent2); }
.tag.green { border-color: #1e4a26; color: var(--green); }

.bottombar {
  height: 52px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
}

.progress {
  display: flex;
  gap: 5px;
  align-items: center;
}

.dot {
  width: 5px; height: 5px;
  background: var(--dim);
  border-radius: 50%;
  transition: background 0.2s;
}

.dot.active { background: var(--accent); }

.nav-btns {
  display: flex;
  gap: 10px;
}

.btn-nav {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--font);
  font-size: 12px;
  padding: 6px 18px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.btn-nav:hover:not(:disabled) {
  color: var(--bright);
  border-color: var(--accent);
  background: rgba(126, 184, 247, 0.06);
}

.btn-nav:disabled {
  opacity: 0.25;
  cursor: default;
}

.hint {
  font-size: 10px;
  color: var(--dim);
}

:fullscreen .topbar,
:-webkit-full-screen .topbar,
:-moz-full-screen .topbar {
  background: #000;
}

:fullscreen body,
:-webkit-full-screen body,
:-moz-full-screen body {
  background: #000;
}