/* ============================================================
 * Kafka Fundamentals slide deck styles.
 * ============================================================ */

:root {
  --yellow: #E9B44C;
  --red: #C2703D;
  --blue: #5B7B9A;
  --purple: #8A7BA8;
  --green: #6B8F71;
  --ink: #3D3229;
  --paper: #FFFDF8;
  --bg: #FAF3E7;
  --line: rgba(61,50,41,.18);
  --muted: rgba(61,50,41,.7);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
html, body { height: 100dvh; }
body {
  font-family: 'Work Sans', sans-serif;
  font-size: 1.15rem;             /* base font bumped from default 16px to ~18px */
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background-image: radial-gradient(rgba(61,50,41,.06) 1.1px, transparent 1.3px);
  background-size: 22px 22px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ---- Deck viewport ---- */
.deck {
  position: relative;
  flex: 1;
  width: 100vw;
  min-height: 0;
  overflow: hidden;
}
.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: none;
  flex-direction: column;
  padding: 0;
}
.slide.active {
  display: flex;
  animation: fadeIn 0.35s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Top kicker bar ---- */
.kicker-bar {
  display: flex;
  align-items: center;
  padding: .9rem clamp(1.5rem, 4vw, 3rem);
  border-bottom: 2px solid var(--ink);
  background: var(--bg);
  flex-shrink: 0;
  gap: 1rem;
}
.kicker-bar .meta { margin-left: auto; }
.kicker-bar .brand {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--ink);
}
.kicker-bar .brand .dot { color: var(--red); }

/* ---- Home link button (in the kicker bar, top-left) ---- */
.kicker-bar .home-link {
  display: inline-block;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--ink);
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 8px;
  padding: 6px 14px;
  text-decoration: none;
  box-shadow: 2px 2px 0 var(--ink);
  transition: all .15s ease;
  flex-shrink: 0;
}
.kicker-bar .home-link:hover {
  background: var(--yellow);
  color: var(--ink);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 var(--ink);
}
.kicker-bar .meta {
  display: flex;
  align-items: center;
  gap: .7rem;
}
.kicker-bar .pill {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.35rem;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 999px;
  padding: .05em .8em;
  box-shadow: 2px 2px 0 var(--ink);
}
.kicker-bar .pill.kactive {
  background: var(--accent);
  color: var(--paper);
}
.kicker-bar .step {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.55rem;
  color: var(--ink);
}

/* ---- Reset button (top kicker bar) ---- */
.reset-btn {
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--ink);
  padding: 6px 16px;
  border-radius: 8px;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.25rem;
  cursor: pointer;
  transition: all .15s ease;
  box-shadow: 2px 2px 0 var(--ink);
  margin: 0;
  flex-shrink: 0;
}
.reset-btn:hover {
  background: var(--red);
  color: var(--paper);
  border-color: var(--red);
  box-shadow: 3px 3px 0 var(--ink);
  transform: translate(-1px, -1px);
}
.reset-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--ink);
}

/* ---- Slide body ---- */
.slide-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1.6rem clamp(1.5rem, 3vw, 3rem) 2rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}
.slide-body::-webkit-scrollbar { width: 8px; }
.slide-body::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
.slide-body::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ---- Title block ---- */
.slide-title-block {
  text-align: center;
  margin-bottom: 1.4rem;
}
.card-title {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: .8rem;
  color: var(--ink);
}
.slide-kicker {
  display: inline-block;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  color: var(--ink);
  background: var(--accent);
  border: 2px solid var(--ink);
  padding: .15em .9em;
  border-radius: 999px;
  transform: rotate(-1.5deg);
  box-shadow: 0 4px 10px rgba(61,50,41,.18);
  margin-bottom: .8rem;
}
.slide-kicker.tight { margin: 0; }      /* used inside cards where the surrounding div already centers */
.slide-title {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.05;
  font-size: clamp(2.4rem, 4.2vw, 3.8rem);
  margin-bottom: .5rem;
}
.slide-title .pop { color: var(--accent); }
.slide-subtitle {
  font-size: clamp(1.1rem, 1.6vw, 1.35rem);
  color: var(--muted);
  font-weight: 500;
  max-width: 820px;
  margin: 0 auto;
  line-height: 1.5;
}

/* ---- Cards ---- */
.card {
  position: relative;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 18px;
  padding: 1.3rem 1.5rem;
  box-shadow: 6px 6px 0 var(--ink);
}
.card-kicker-wrap {
  text-align: center;
  margin-bottom: .8rem;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: var(--accent);
  border-radius: 16px 16px 0 0;
}

/* ---- Two-column layout ---- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  align-items: start;
}

/* ---- Try this / Explanation blocks ---- */
.try-this,
.explanation {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 14px;
  padding: .9rem 1.2rem;
  margin-bottom: 1rem;
  box-shadow: 4px 4px 0 var(--ink);
  font-size: 1.1rem;
  line-height: 1.55;
}
.try-this { border-color: var(--purple); box-shadow: 4px 4px 0 var(--purple); }
.explanation { border-color: var(--blue); box-shadow: 4px 4px 0 var(--blue); margin-top: 1rem; }
.try-this-label,
.explanation-label {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.5rem;
  margin-bottom: .15rem;
}
.try-this-label { color: var(--purple); }
.explanation-label { color: var(--blue); }
.try-this p strong,
.explanation strong { color: var(--ink); }

/* ---- Visualization container ---- */
.viz {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 18px;
  padding: 1.4rem;
  margin-bottom: 1rem;
  box-shadow: 6px 6px 0 var(--ink);
}
.topic-box {
  background: var(--bg);
  border: 2px solid var(--ink);
  border-radius: 12px;
  padding: 1.1rem;
  margin-bottom: .9rem;
}
.topic-label {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-size: 1.35rem;
  margin-bottom: .8rem;
  text-align: center;
  color: var(--ink);
}
.topic-label .ep {
  font-family: 'Caveat', cursive;
  color: var(--accent);
  font-weight: 700;
  margin-right: .4em;
}
.partitions {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.partition {
  flex: 1;
  background: #fff;
  border: 2px solid var(--ink);
  border-radius: 10px;
  padding: 10px;
  min-height: 160px;
  position: relative;
  transition: transform .2s ease, box-shadow .2s ease;
}
.partition:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0 var(--ink);
}
.partition-title {
  text-align: center;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--ink);
  margin-bottom: 8px;
}
.record {
  padding: 6px 10px;
  margin: 4px 0;
  border-radius: 6px;
  text-align: center;
  font-size: .9em;
  font-weight: 600;
  animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 1px 3px rgba(0,0,0,.15);
  color: #fff;
}
.record.green  { background: var(--green); }
.record.blue   { background: var(--blue); }
.record.orange { background: var(--red); }
.record.purple { background: var(--purple); }
.record.yellow { background: var(--yellow); color: var(--ink); }
.record.stale {
  background: #ffcdd2;
  color: #c62828;
  text-decoration: line-through;
  opacity: 0.7;
}
.record.fresh {
  background: #c8e6c9;
  color: #2e7d32;
  font-weight: 700;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px) scale(0.95); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---- Consumer group section ---- */
.consumers {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: .8rem;
  flex-wrap: wrap;
}
.consumer {
  background: #fff;
  border: 2px solid var(--ink);
  border-radius: 8px;
  padding: 10px 14px;
  text-align: center;
  min-width: 100px;
  font-size: 1rem;
  font-weight: 600;
  transition: all .2s ease;
  box-shadow: 2px 2px 0 var(--ink);
}
.consumer.active {
  background: var(--green);
  color: #fff;
}
.consumer.idle {
  background: var(--yellow);
  color: var(--ink);
  border-style: dashed;
}
.assignment {
  margin-top: 4px;
  font-weight: 700;
  font-family: 'Caveat', cursive;
  font-size: 1.2rem;
}
.consumer.active .assignment { color: rgba(255,255,255,.85); }
.arrow {
  text-align: center;
  font-size: 1.8em;
  color: var(--muted);
  margin: .4rem 0;
}

/* ---- Controls ---- */
.controls {
  text-align: center;
  margin: .7rem 0;
}
button {
  padding: 9px 18px;
  margin: 0 4px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-family: 'Work Sans', sans-serif;
  transition: all .15s ease;
  box-shadow: 3px 3px 0 var(--ink);
}
button:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 var(--ink);
  background: #fff8f0;
}
button:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--ink);
}
button.danger {
  background: var(--red);
  color: #fff;
}
button.danger:hover { background: #b5632f; }
button.toggle {
  background: var(--paper);
}
button.toggle.active {
  background: var(--green);
  color: #fff;
}

/* ---- Mode indicator ---- */
.mode-indicator {
  text-align: center;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: .6rem;
  font-size: 1.6rem;
}
.mode-indicator .hl {
  background: var(--accent);
  color: var(--ink);
  padding: 0 .3em;
  border-radius: 6px;
}

/* ---- Producer buttons row ---- */
.producer {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: .5rem 0;
}
.producer button {
  padding: 9px 18px;
  font-size: 1rem;
  margin: 0;
}
.producer button.blue   { background: var(--blue); color: #fff; }
.producer button.orange { background: var(--red);  color: #fff; }
.producer button.purple { background: var(--purple); color: #fff; }
.producer button:hover  { filter: brightness(1.1); }

/* ---- Decision table ---- */
.decision-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: .8rem 0;
  font-size: 1.05rem;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 5px 5px 0 var(--ink);
}
.decision-table th {
  background: var(--ink);
  color: #fff;
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  font-family: 'Work Sans', sans-serif;
  font-size: 1.1rem;
}
.decision-table td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: middle;
}
.decision-table tr:last-child td { border-bottom: none; }
.decision-table tr:nth-child(even) td { background: rgba(0,0,0,.02); }
.decision-table .kafka-row { border-left: 5px solid var(--blue); }
.decision-table .queue-row { border-left: 5px solid var(--green); }
.decision-table .pill {
  display: inline-block;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.25rem;
  padding: .05em .55em;
  border-radius: 999px;
  color: #fff;
}
.decision-table .kafka-row .pill { background: var(--blue); }
.decision-table .queue-row .pill { background: var(--green); }
.decision-table.flush { margin: 0; box-shadow: none; border: none; }  /* inside .card */

/* Standalone pill color modifiers (used outside row context, e.g. yes/no cells) */
.pill.danger  { background: var(--red); }
.pill.success { background: var(--green); }

/* ---- Group columns (consumer groups) ---- */
.group-row {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
.group-col {
  flex: 1;
  min-width: 300px;
  background: var(--bg);
  border: 2px dashed var(--ink);
  border-radius: 12px;
  padding: .8rem;
}
.group-col-title {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
  font-size: 1.4rem;
}

/* ---- Side info column ---- */
.side-info {
  display: flex;
  flex-direction: column;
  gap: .9rem;
}
.info-card {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 12px;
  padding: .9rem 1.1rem;
  box-shadow: 4px 4px 0 var(--ink);
}
.info-card-title {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.45rem;
  margin-bottom: .25rem;
}
.info-card p {
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink);
}
.info-card code {
  background: rgba(91,123,154,.1);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: .95em;
}
.info-card.blue   { border-color: var(--blue);   box-shadow: 4px 4px 0 var(--blue); }
.info-card.green  { border-color: var(--green);  box-shadow: 4px 4px 0 var(--green); }
.info-card.purple { border-color: var(--purple); box-shadow: 4px 4px 0 var(--purple); }
.info-card.red    { border-color: var(--red);    box-shadow: 4px 4px 0 var(--red); }
.info-card.yellow { border-color: var(--yellow); box-shadow: 4px 4px 0 var(--yellow); }
.info-card.blue   .info-card-title { color: var(--blue); }
.info-card.green  .info-card-title { color: var(--green); }
.info-card.purple .info-card-title { color: var(--purple); }
.info-card.red    .info-card-title { color: var(--red); }
.info-card.yellow .info-card-title { color: #b8923a; }

/* ---- Reveal-step pattern ----
   Mark an info card with class="reveal-step" to make it appear on
   the next "right arrow" press, one at a time. Cards without the
   class are visible immediately. The JS in the slide deck tracks
   per-slide revealed state and only advances the slide when all
   reveal steps are shown. Add a `<div class="reveal-hint">` at
   the end of `.side-info` to show the pulsing prompt. */
.reveal-step {
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  max-height: 0;
  margin: 0;
  padding-top: 0;
  padding-bottom: 0;
  overflow: hidden;
  transition: opacity .35s ease, transform .35s ease,
              max-height .4s ease, margin .35s ease,
              padding .35s ease, box-shadow .35s ease;
}
.reveal-step.revealed {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  max-height: 600px;
}

/* "Tap to reveal" hint shown only when there are unrevealed cards */
.reveal-hint {
  display: none;
  text-align: center;
  font-family: 'Caveat', cursive;
  font-size: 1.3rem;
  color: var(--muted);
  margin-top: .5rem;
  animation: pulse 1.6s ease-in-out infinite;
}
.slide.has-unrevealed .reveal-hint { display: block; }
@keyframes pulse {
  0%, 100% { opacity: .55; }
  50%      { opacity: 1; }
}

/* ---- Mini cluster diagram ---- */
.cluster {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: .5rem;
  font-family: 'Caveat', cursive;
}
.cluster-bar-wrap {
  position: relative;
  padding-top: 16px;
  margin-top: 6px;
}
.cluster-bar {
  display: flex;
  align-items: stretch;
  border: 2.5px solid var(--blue);
  border-radius: 8px;
  overflow: hidden;
  background: var(--paper);
}
.cluster-bar-label {
  position: absolute;
  top: 0;
  left: 16px;
  background: var(--bg);
  padding: 0 8px;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--blue);
  z-index: 2;
}
.cluster-cell {
  flex: 1;
  border-right: 2px dashed rgba(91,123,154,.4);
  padding: 8px 6px;
  text-align: center;
  font-weight: 700;
  color: var(--blue);
  font-size: 1.15rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
}
.cluster-cell:last-child { border-right: none; }
.cluster-cell .pid { font-size: 1.35rem; }
.cluster-arrows {
  display: flex;
  align-items: center;
  gap: 0;
  font-size: 1.3rem;
  color: var(--muted);
  justify-content: space-around;
}
.cluster-broker {
  flex: 1;
  background: #fff;
  border: 2px solid var(--ink);
  border-radius: 6px;
  padding: 6px 8px;
  font-weight: 700;
  font-size: 1.1rem;
  text-align: center;
  box-shadow: 2px 2px 0 var(--ink);
  margin: 0 4px;
}
.cluster-caption {
  text-align: center;
  font-family: 'Caveat', cursive;
  font-size: 1.2rem;
  color: var(--muted);
  margin-top: 6px;
}

/* ---- Actor diagram (slides 1, 2) ----
   Use grid with explicit columns. For slide 1 (.actor.simple, 3
   children), 3 columns fit in one row. For slide 2 (.actor.flow, 5
   children), 5 columns are defined; on wide screens all fit in one
   row, on narrow screens CSS auto-flows them. To prevent the
   "lonely arrow" wrap pattern, arrows use a smaller min-width and
   the whole grid sits in a centered, auto-fit container. */
.actor {
  display: grid;
  gap: 12px;
  align-items: center;
  justify-items: center;
  padding: 1.2rem 0;
}
.actor.simple { grid-template-columns: repeat(3, auto); }
.actor.flow   { grid-template-columns: repeat(5, auto); }
.actor-box {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 14px;
  padding: .9rem 1.1rem;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.45rem;
  text-align: center;
  box-shadow: 4px 4px 0 var(--ink);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  /* Sized so 5 boxes + 4 arrows fit on one row in the .card on
     a 2-col grid. min-width keeps text from breaking weirdly;
     max-width prevents oversized boxes on giant screens. On
     tablet and mobile, the media queries below shrink these. */
  min-width: 110px;
  max-width: 160px;
}
.actor-box.producer { border-color: var(--blue); box-shadow: 4px 4px 0 var(--blue); }
.actor-box.broker   { border-color: var(--red);  box-shadow: 4px 4px 0 var(--red);  background: var(--yellow); }
.actor-box.consumer { border-color: var(--green); box-shadow: 4px 4px 0 var(--green); }
.actor-arrow {
  font-size: 1.8rem;
  color: var(--ink);
  font-weight: 700;
}
.actor-arrow.bidi::before { content: '\2194'; }
.actor-arrow.right::before { content: '\2192'; }
.actor-sub {
  font-size: .8rem;
  font-family: 'Work Sans', sans-serif;
  font-weight: 500;
  color: var(--muted);
  margin-top: 3px;
}

/* ---- Shared caption (used under actor diagrams and on slide 7) ---- */
.caption {
  text-align: center;
  font-family: 'Caveat', cursive;
  font-size: 1.25rem;
  color: var(--muted);
  margin-top: .6rem;
}

/* ---- Topic folder visual (slide 3) ---- */
.topic-folder {
  background: var(--paper);
  border: 2px solid var(--blue);
  border-radius: 12px;
  padding: .8rem;
  margin-bottom: .6rem;
  box-shadow: 3px 3px 0 var(--blue);
}
.topic-folder-label {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--blue);
  text-align: center;
  margin-bottom: .5rem;
  border-bottom: 1.5px dashed rgba(91,123,154,.4);
  padding-bottom: .4rem;
}
.topic-folder-msg {
  background: #fff;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 1rem;
  margin: 4px 0;
  border: 1px solid var(--line);
  font-family: 'Work Sans', sans-serif;
  font-weight: 500;
}

/* ---- Retention timeline (static, slide 7) ---- */
.retention-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
}
.retention-panel {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: 4px 4px 0 var(--ink);
}
.retention-panel.time    { border-color: var(--red);    box-shadow: 4px 4px 0 var(--red); }
.retention-panel.compact { border-color: var(--blue);   box-shadow: 4px 4px 0 var(--blue); }
.retention-panel-title {
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: .5rem;
}
.retention-panel.time    .retention-panel-title { color: var(--red); }
.retention-panel.compact .retention-panel-title { color: var(--blue); }
.retention-panel-today {
  font-family: 'Caveat', cursive;
  font-size: 1.15rem;
  text-align: center;
  color: var(--muted);
  margin-bottom: .6rem;
  font-style: italic;
}
.retention-records {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.retention-key-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: .6rem;
  padding-left: .3rem;
  border-left: 3px solid var(--line);
}
.retention-key-label {
  font-family: 'Fraunces', serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  margin-bottom: .15rem;
  letter-spacing: .02em;
}
.retention-reason {
  font-family: 'Caveat', cursive;
  font-size: 1.05rem;
  color: var(--muted);
  margin-left: .3rem;
}
.retention-when {
  font-size: 1.05rem;
  color: var(--ink);
  background: var(--paper);
  border-left: 4px solid var(--yellow);
  padding: .7rem 1rem;
  margin-top: 1rem;
  border-radius: 6px;
  line-height: 1.5;
}
.retention-when strong {
  color: var(--ink);
  font-family: 'Fraunces', serif;
}

/* ---- Navigation bar ---- */
.navbar {
  position: relative;
  width: 100%;
  flex-shrink: 0;
  background: var(--ink);
  padding: 12px clamp(1rem, 3vw, 2rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  z-index: 100;
  box-shadow: 0 -4px 0 var(--ink);
}
.nav-btn {
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--paper);
  padding: 10px 18px;
  border-radius: 8px;
  font-family: 'Caveat', cursive;
  font-weight: 700;
  font-size: 1.3rem;
  cursor: pointer;
  transition: all .15s ease;
  box-shadow: none;
  margin: 0;
}
.nav-btn:hover {
  background: var(--yellow);
  border-color: var(--yellow);
  transform: translateY(-1px);
}
.nav-btn:disabled {
  opacity: 0.35;
  cursor: default;
  transform: none;
  background: var(--paper);
  border-color: var(--paper);
}
.nav-dots {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,.25);
  cursor: pointer;
  transition: all .25s ease;
  border: 2px solid transparent;
  padding: 0;
  box-shadow: none;
}
.nav-dot:hover { background: rgba(255,255,255,.5); }
.nav-dot.active {
  background: var(--yellow);
  width: 32px;
  border-radius: 5px;
}
.nav-label {
  color: var(--paper);
  font-family: 'Caveat', cursive;
  font-size: 1.4rem;
  font-weight: 700;
  flex: 1;
  text-align: center;
}

/* ---- Flush utility: removes bottom margin on the last visible element in a column ---- */
.flush { margin-bottom: 0 !important; }

/* ---- Responsive ---- */

/* Tablet and below: collapse 2-col layouts to 1, soften large fixed widths */
@media (max-width: 900px) {
  .group-row { flex-direction: column; }
  .group-col { min-width: 0; }
}
@media (max-width: 800px) {
  .grid-2 { grid-template-columns: 1fr; }
  .retention-grid { grid-template-columns: 1fr; }
  /* Actor diagrams: shrink the box min-width so 5 items fit on one row */
  .actor-box { min-width: 80px; max-width: 120px; }
}

/* Mobile: tighten kicker bar, shrink fonts, scale down actor boxes */
@media (max-width: 600px) {
  /* Kicker bar: smaller fonts, allow wrap without breaking layout */
  .kicker-bar { padding: .6rem 1rem; gap: .4rem; flex-wrap: wrap; }
  .kicker-bar .brand { font-size: 1.3rem; }
  .kicker-bar .pill { font-size: 1rem; padding: 2px 10px; white-space: nowrap; }
  .kicker-bar .step { font-size: 1rem; }
  .kicker-bar .home-link { font-size: 1rem; padding: 4px 10px; }
  .reset-btn { font-size: .9rem; padding: 4px 10px; }
  .reset-btn { display: none; }  /* hide reset on very small screens; keyboard 'r' or 9-key reset still works via existing handlers */

  /* Title block: smaller hero, tighter spacing */
  .slide-title-block { margin-bottom: .8rem; }
  .slide-title { font-size: clamp(1.5rem, 6vw, 2.2rem) !important; }
  .slide-subtitle { font-size: .9rem; }

  /* Grid: tighter gap so stacked columns fit in viewport */
  .grid-2 { gap: .7rem; }
  .side-info { gap: .5rem; }

  /* Cards: less padding, smaller text */
  .card { padding: .6rem; }
  .card-kicker-wrap { margin-bottom: .2rem; }
  .info-card { padding: .5rem .7rem; }
  .info-card-title { font-size: 1rem; margin-bottom: .15rem; }
  .info-card p { font-size: .85rem; }
  .explanation, .try-this { padding: .6rem .8rem; font-size: .9rem; }

  /* Actor diagrams: even smaller boxes, allow vertical flow on tiny screens */
  .actor-box { min-width: 60px; max-width: 100px; font-size: .95rem; padding: .4rem .5rem; }
  .actor-arrow { font-size: 1.1rem; min-width: 18px; }
  .actor { gap: 6px; padding: .4rem 0; }
  .caption { font-size: 1rem; margin-top: .2rem; }

  /* Topic folder / partition / record chips: scale down */
  .topic-box { padding: .8rem; }
  .topic-label { font-size: 1.1rem; }
  .partition { min-width: 0; padding: .4rem; }
  .partition-title { font-size: 1rem; }
  .record { padding: 4px 6px; font-size: .9rem; }

  /* Tables: shrink fonts, allow horizontal scroll if needed */
  .decision-table th, .decision-table td { padding: 6px 8px; font-size: .9rem; }
  .decision-table { font-size: .9rem; }

  /* Interactive demo rows: stack vertically */
  .partitions { flex-direction: column; }
  .producer { flex-direction: column; }
  .producer button { width: 100%; }

  /* Navbar: tighter */
  .navbar { gap: .4rem; padding: 8px 1rem; }
  .nav-btn { padding: 8px 10px; font-size: .9rem; }
  .nav-label { display: none; }
  .nav-dots { gap: 4px; }
  .nav-dot { width: 8px; height: 8px; }

  /* Slide body: small bottom padding so the last card is not flush with the edge. */
  .slide-body { padding: .8rem .8rem 1.5rem; }
}