:root {
  color-scheme: light;
  --slide-bg: #fbfaf7;
  --slide-text: #171717;
  --slide-muted: #5d5d5d;
  --slide-accent: #2457a6;
  --slide-border: #dedbd2;
  --slide-code-bg: #f1efe9;
  --slide-shadow: rgba(23, 23, 23, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body.presentation-body {
  margin: 0;
  background: var(--slide-bg);
  color: var(--slide-text);
  font-family: "Atkinson Hyperlegible", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.45;
}

.presentation-shell {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.presentation-topbar,
.presentation-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.4rem;
  color: var(--slide-muted);
  font-size: 0.95rem;
}

.presentation-topbar a {
  color: var(--slide-accent);
  text-decoration: none;
  font-weight: 700;
}

.slide-counter {
  font-variant-numeric: tabular-nums;
}

.deck {
  position: relative;
  min-height: 0;
}

.slide {
  display: none;
  min-height: calc(100vh - 7.2rem);
  padding: clamp(2rem, 5vw, 5rem);
  place-items: center;
}

.slide.is-active {
  display: grid;
}

.slide-content {
  width: min(1120px, 100%);
}

.slide-kicker {
  margin: 0 0 1rem;
  color: var(--slide-accent);
  font-size: clamp(1rem, 1.8vw, 1.35rem);
  font-weight: 800;
  letter-spacing: 0;
}

.slide h1,
.slide h2 {
  margin: 0;
  max-width: 16ch;
  font-weight: 850;
  line-height: 1.04;
  letter-spacing: 0;
}

.slide h1 {
  font-size: clamp(3rem, 7vw, 6.4rem);
}

.slide h2 {
  font-size: clamp(2.4rem, 5.4vw, 5rem);
}

.slide p,
.slide li {
  max-width: 64ch;
  font-size: clamp(1.55rem, 2.4vw, 2.35rem);
}

.slide p {
  margin: 1.4rem 0 0;
}

.slide ul,
.slide ol {
  display: grid;
  gap: 1.1rem;
  margin: 1.8rem 0 0;
  padding-left: 1.4em;
}

.fragment {
  opacity: 0;
  transform: translateY(10px);
  color: var(--slide-text);
  transition: opacity 180ms ease, transform 180ms ease;
}

.fragment.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.fragment.is-dimmed {
  color: #8a8a8a;
}

.code-block.fragment.is-dimmed {
  color: #777777;
}

.code-step.is-dimmed .code-block {
  color: #777777;
}

.code-block {
  display: block;
  width: min(900px, 100%);
  margin: 2rem 0 0;
  padding: 1.4rem;
  border: 1px solid var(--slide-border);
  border-radius: 10px;
  background: var(--slide-code-bg);
  color: var(--slide-text);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: clamp(1.3rem, 2.2vw, 2.1rem);
  line-height: 1.35;
  overflow-x: auto;
  box-shadow: 0 14px 34px var(--slide-shadow);
}

.code-block.compact-code {
  width: min(980px, 100%);
  font-size: clamp(0.95rem, 1.45vw, 1.45rem);
  line-height: 1.3;
}

.code-block.tiny-code {
  width: min(1040px, 100%);
  font-size: clamp(0.72rem, 1.05vw, 1.05rem);
  line-height: 1.25;
}

.code-step {
  margin-top: 1.2rem;
}

.code-step .code-block {
  margin-top: 0;
}

.code-step p {
  margin-top: 0.75rem;
  font-size: clamp(1.15rem, 1.8vw, 1.6rem);
  color: var(--slide-muted);
}

.code-step.is-dimmed p {
  color: #969696;
}

.mermaid {
  width: min(980px, 100%);
  margin-top: 2rem;
  padding: 1.4rem;
  border: 1px solid var(--slide-border);
  border-radius: 10px;
  background: #171717;
  color: #f4f7fb;
  overflow-x: auto;
  box-shadow: 0 14px 34px var(--slide-shadow);
}

.mermaid svg {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.two-column {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: start;
}

.prompt-card {
  margin-top: 2rem;
  padding: 1.4rem;
  border: 1px solid var(--slide-border);
  border-radius: 12px;
  background: #ffffff;
}

.prompt-card p {
  margin-top: 0.6rem;
  font-size: clamp(1.1rem, 1.7vw, 1.35rem);
}

.tkinter-presentation-simulator {
  display: grid;
  grid-template-columns: minmax(16rem, 24rem) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: start;
  margin-top: 2rem;
}

.tkinter-presentation-window {
  overflow: hidden;
  border: 1px solid #8c8c8c;
  border-radius: 6px;
  background: #ececec;
  color: #111111;
  box-shadow: 0 18px 38px rgba(0, 0, 0, 0.2);
  font-family: Arial, Helvetica, sans-serif;
}

.tkinter-presentation-titlebar {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.45rem 0.65rem;
  border-bottom: 1px solid #a9a9a9;
  background: #d8d8d8;
  font-size: 0.9rem;
}

.tkinter-presentation-body {
  display: grid;
  gap: 0.7rem;
  padding: 1.2rem;
}

.tkinter-presentation-body label,
.tkinter-presentation-body p {
  margin: 0;
  color: #111111;
  font-size: 1rem;
}

.tkinter-presentation-body input {
  width: 100%;
  min-height: 2.2rem;
  padding: 0.3rem 0.45rem;
  border: 2px inset #f7f7f7;
  border-radius: 0;
  background: #ffffff;
  color: #111111;
  font: 1rem/1.4 Arial, Helvetica, sans-serif;
}

.tkinter-presentation-body button,
.tkinter-presentation-trace button {
  justify-self: start;
  min-height: 2.2rem;
  padding: 0.35rem 0.85rem;
  border: 2px outset #f3f3f3;
  border-radius: 0;
  background: #e5e5e5;
  color: #111111;
  font: 1rem/1.3 Arial, Helvetica, sans-serif;
  cursor: pointer;
}

.tkinter-presentation-body p {
  min-height: 1.5rem;
  font-weight: 700;
}

#presentation-joke-label {
  white-space: pre-line;
}

.tkinter-presentation-trace {
  display: grid;
  gap: 1rem;
  padding: 1.2rem;
  border-left: 4px solid var(--slide-accent);
  background: #f1efe9;
}

.tkinter-presentation-trace h3 {
  margin: 0;
  font-size: 1.35rem;
}

.tkinter-presentation-trace output {
  min-height: 8rem;
  white-space: pre-wrap;
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 1rem;
  line-height: 1.5;
}

@media (max-width: 760px) {
  .tkinter-presentation-simulator {
    grid-template-columns: 1fr;
  }
}

.flow-symbol-grid {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
  width: min(860px, 100%);
}

.flow-symbol-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 1.5rem;
  align-items: center;
}

.flow-symbol {
  display: grid;
  min-height: 76px;
  place-items: center;
  border: 3px solid var(--slide-text);
  color: var(--slide-text);
  font-size: clamp(1rem, 1.5vw, 1.35rem);
  font-weight: 800;
  line-height: 1;
}

.flow-symbol.oval {
  border-radius: 999px;
}

.flow-symbol.rectangle {
  border-radius: 4px;
}

.flow-symbol.diamond {
  width: 82px;
  height: 82px;
  min-height: 0;
  justify-self: center;
  transform: rotate(45deg);
}

.flow-symbol.diamond span {
  transform: rotate(-45deg);
}

.flow-symbol.arrow {
  min-height: auto;
  border: 0;
  font-size: clamp(3rem, 5vw, 5rem);
}

.flow-symbol-row p {
  margin: 0;
}

.visual-flow {
  display: grid;
  gap: 0.55rem;
  justify-items: center;
  margin-top: 1.5rem;
  width: min(920px, 100%);
}

.flow-node {
  display: grid;
  min-width: 220px;
  min-height: 64px;
  place-items: center;
  padding: 0.7rem 1.1rem;
  border: 3px solid var(--slide-text);
  background: #ffffff;
  color: var(--slide-text);
  font-size: clamp(1rem, 1.55vw, 1.35rem);
  font-weight: 800;
  text-align: center;
}

.flow-node.terminal {
  border-radius: 999px;
}

.flow-node.decision {
  width: 130px;
  height: 130px;
  min-width: 0;
  min-height: 0;
  transform: rotate(45deg);
}

.flow-node.decision span {
  max-width: 110px;
  transform: rotate(-45deg);
}

.flow-arrow {
  color: var(--slide-accent);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 900;
  line-height: 1;
}

.flow-branches {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 2.5rem);
  width: min(720px, 100%);
}

.flow-branch {
  display: grid;
  gap: 0.45rem;
  justify-items: center;
}

.branch-label {
  color: var(--slide-accent);
  font-size: clamp(1.1rem, 1.8vw, 1.55rem);
  font-weight: 850;
}

.use-case-diagram {
  display: grid;
  grid-template-columns: minmax(90px, 0.7fr) minmax(0, 2.8fr) minmax(90px, 0.7fr);
  gap: clamp(0.8rem, 2vw, 1.4rem);
  align-items: center;
  margin-top: 1.5rem;
  width: min(1040px, 100%);
}

.actor-box,
.system-box {
  border: 3px solid var(--slide-text);
  background: #ffffff;
}

.actor-box {
  display: grid;
  min-height: 86px;
  place-items: center;
  padding: 0.7rem;
  border-radius: 999px;
  font-size: clamp(1rem, 1.55vw, 1.35rem);
  font-weight: 850;
  text-align: center;
}

.actor-stack {
  display: grid;
  gap: 0.8rem;
}

.system-box {
  padding: 0.9rem;
  border-radius: 8px;
}

.system-box h3 {
  margin: 0 0 0.8rem;
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  text-align: center;
}

.usecase-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.usecase {
  display: grid;
  min-height: 54px;
  place-items: center;
  padding: 0.45rem 0.7rem;
  border: 2px solid var(--slide-accent);
  border-radius: 999px;
  background: #f6f8fc;
  color: var(--slide-text);
  font-size: clamp(0.85rem, 1.25vw, 1.05rem);
  font-weight: 750;
  text-align: center;
}

.diagram-note {
  margin-top: 1rem;
  color: var(--slide-muted);
  font-size: clamp(1rem, 1.5vw, 1.3rem);
}

.diagram-svg {
  display: block;
  width: min(1040px, 100%);
  height: auto;
  margin-top: 1.2rem;
  overflow: visible;
}

.diagram-svg .shape {
  fill: #ffffff;
  stroke: var(--slide-text);
  stroke-width: 4;
}

.diagram-svg .system-boundary {
  fill: #ffffff;
  stroke: var(--slide-text);
  stroke-width: 3;
}

.diagram-svg .usecase-shape {
  fill: #f6f8fc;
  stroke: var(--slide-accent);
  stroke-width: 3;
}

.diagram-svg .line {
  fill: none;
  stroke: var(--slide-accent);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.diagram-svg .relation {
  fill: none;
  stroke: var(--slide-text);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.diagram-svg .dashed {
  stroke-dasharray: 8 8;
}

.diagram-svg text {
  fill: var(--slide-text);
  font-family: "Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;
  font-size: 22px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: middle;
}

.diagram-svg .small-text {
  font-size: 17px;
  font-weight: 750;
}

.diagram-svg .label-text {
  fill: var(--slide-accent);
  font-size: 22px;
  font-weight: 900;
}

.diagram-svg .system-title {
  font-size: 20px;
  font-weight: 850;
}

.nav-hint {
  color: var(--slide-muted);
}

@media (max-width: 760px) {
  .two-column {
    grid-template-columns: 1fr;
  }

  .presentation-topbar,
  .presentation-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .slide {
    min-height: calc(100vh - 9rem);
  }

  .flow-symbol-row {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .flow-branches,
  .use-case-diagram,
  .usecase-grid {
    grid-template-columns: 1fr;
  }
}