/* ==========================================================================
   Design tokens — alinhados ao design.md (tema escuro para apresentação)
   ========================================================================== */

:root {
  --primary: #3ecf8e;
  --primary-deep: #24b47e;
  --primary-soft: #4ade80;
  --primary-muted: rgba(62, 207, 142, 0.12);

  --canvas-night: #1c1c1c;
  --canvas-night-soft: #202020;
  --canvas-night-lift: #262626;
  --canvas-outer: #111111;

  --hairline: rgba(255, 255, 255, 0.08);
  --hairline-strong: rgba(255, 255, 255, 0.14);

  --ink: #ffffff;
  --ink-secondary: #e8e8e8;
  --ink-mute: #9a9a9a;
  --ink-faint: #707070;
  --on-primary: #171717;

  --shadow-0: none;
  --shadow-1: 0 1px 3px rgba(0, 0, 0, 0.24);
  --shadow-2: 0 8px 24px rgba(0, 0, 0, 0.32);

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-xxl: 32px;
  --space-huge: 48px;

  --pad-x: clamp(40px, 5vw, 72px);
  --pad-y: clamp(32px, 4.5vh, 56px);
  --chrome-h: 40px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.5s;
}

/* ==========================================================================
   Base
   ========================================================================== */

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--canvas-outer);
  font-family: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-weight: 400;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Viewport 16:9
   ========================================================================== */

.presentation {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--canvas-outer);
}

.slide-viewport {
  position: relative;
  width: min(100vw, calc(100vh * 16 / 9));
  height: min(100vh, calc(100vw * 9 / 16));
  aspect-ratio: 16 / 9;
  background: var(--canvas-night);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-2);
  overflow: hidden;
  container-type: size;
  container-name: slide;
}

.slides {
  position: relative;
  width: 100%;
  height: 100%;
}

/* ==========================================================================
   Slides
   ========================================================================== */

.slide {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  padding: var(--pad-y) var(--pad-x);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--duration) var(--ease-out),
    transform var(--duration) var(--ease-out),
    visibility var(--duration);
  overflow: hidden;
  background-color: var(--canvas-night);
  background-image:
    linear-gradient(var(--hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px);
  background-size: 64px 64px;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  z-index: 2;
}

.slide--cover {
  padding: 0;
  justify-content: center;
  align-items: center;
  background-image: none;
}

.slide--cover::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(62, 207, 142, 0.07), transparent),
    var(--canvas-night);
  pointer-events: none;
}

/* Slide chrome (slides de conteúdo) */
.slide-chrome {
  position: absolute;
  top: var(--space-xl);
  left: var(--pad-x);
  right: var(--pad-x);
  height: var(--chrome-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 5;
  pointer-events: none;
}

.slide-chrome__brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.slide-chrome__dot {
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--primary);
  flex-shrink: 0;
}

.slide-chrome__topic {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.slide-chrome__logo {
  height: 14px;
  width: auto;
  opacity: 0.55;
}

.slide-body {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  margin-top: calc(var(--chrome-h) + var(--space-sm));
  justify-content: flex-start;
  gap: clamp(12px, 1.8cqh, 20px);
}

.slide-body--centered {
  justify-content: flex-start;
}

.slide-body--middle {
  justify-content: center;
}

.slide-body--diagram {
  gap: clamp(10px, 1.5cqh, 18px);
}

.slide-body--no-chrome {
  margin-top: 0;
}

/* Stagger animation on active slide */
.slide.active .animate-in {
  animation: fadeUp 0.55s var(--ease-out) both;
}

.slide.active .animate-in:nth-child(1) { animation-delay: 0.04s; }
.slide.active .animate-in:nth-child(2) { animation-delay: 0.08s; }
.slide.active .animate-in:nth-child(3) { animation-delay: 0.12s; }
.slide.active .animate-in:nth-child(4) { animation-delay: 0.16s; }
.slide.active .animate-in:nth-child(5) { animation-delay: 0.20s; }
.slide.active .animate-in:nth-child(6) { animation-delay: 0.24s; }

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   Typography — escala para apresentação (legível em projetor/tela cheia)
   Usa cqh = % da altura do slide (container query)
   ========================================================================== */

.display-xxl {
  font-size: clamp(36px, 6.5cqh, 64px);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.display-xl {
  font-size: clamp(30px, 5.5cqh, 48px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.display-lg {
  font-size: clamp(26px, 4.8cqh, 42px);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.display-md {
  font-size: clamp(20px, 3.6cqh, 32px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.heading-lg {
  font-size: clamp(18px, 2.8cqh, 24px);
  font-weight: 500;
  line-height: 1.25;
}

.heading-md {
  font-size: clamp(16px, 2.4cqh, 22px);
  font-weight: 500;
  line-height: 1.35;
}

.body-lg {
  font-size: clamp(17px, 2.6cqh, 24px);
  font-weight: 400;
  line-height: 1.5;
  color: var(--ink-secondary);
}

.body-md {
  font-size: clamp(16px, 2.3cqh, 22px);
  font-weight: 400;
  line-height: 1.5;
  color: var(--ink-secondary);
}

.body-sm {
  font-size: clamp(14px, 2cqh, 18px);
  font-weight: 400;
  line-height: 1.45;
  color: var(--ink-mute);
}

.caption {
  font-size: clamp(13px, 1.8cqh, 16px);
  font-weight: 400;
  line-height: 1.45;
  color: var(--ink-mute);
}

.label-upper {
  font-size: clamp(11px, 1.5cqh, 13px);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.text-muted { color: var(--ink-mute); }
.text-faint { color: var(--ink-faint); }
.text-accent { color: var(--primary); }

.em {
  font-style: normal;
  color: var(--primary);
}

/* Explicacao curta didatica abaixo do titulo */
.explain {
  font-size: clamp(16px, 2.3cqh, 22px);
  font-weight: 400;
  line-height: 1.5;
  color: var(--ink-secondary);
  max-width: 96%;
}

.explain strong {
  color: var(--ink);
  font-weight: 500;
}

.explain em {
  font-style: normal;
  color: var(--primary);
}

.explain + .diagram-wrap,
.explain + .grid-factors,
.explain + .split,
.explain + .callout {
  margin-top: clamp(8px, 1.2cqh, 14px);
}

.explain.text-center {
  margin-inline: auto;
  text-align: center;
}

/* ==========================================================================
   Accent & badges
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: clamp(14px, 2cqh, 18px);
  font-weight: 500;
  background: var(--primary-muted);
  color: var(--primary);
}

.badge--outline {
  background: transparent;
  border: 1px solid rgba(62, 207, 142, 0.25);
}

/* ==========================================================================
   Cards — card-feature-dark do design.md
   ========================================================================== */

.card {
  background: var(--canvas-night-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: clamp(14px, 2.2cqh, 24px) clamp(16px, 2.5cqh, 28px);
}

.card .body-md,
.card .body-lg {
  font-size: clamp(16px, 2.3cqh, 22px);
}

.card--lift {
  background: var(--canvas-night-lift);
  border-color: var(--hairline-strong);
}

.card--accent {
  border-color: rgba(62, 207, 142, 0.22);
  background: rgba(62, 207, 142, 0.05);
}

.card--featured {
  background: var(--canvas-night-lift);
  border-color: var(--hairline-strong);
  box-shadow: var(--shadow-1);
}

/* ==========================================================================
   Callout / quote
   ========================================================================== */

.callout {
  border-left: 3px solid var(--primary);
  padding: clamp(14px, 2cqh, 20px) clamp(16px, 2.5cqh, 28px);
  background: var(--canvas-night-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.callout p {
  font-size: clamp(17px, 2.5cqh, 24px);
  font-weight: 500;
  line-height: 1.45;
  color: var(--ink);
}

.callout p + p {
  margin-top: var(--space-sm);
}

.callout--lg p {
  font-size: clamp(19px, 2.8cqh, 28px);
}

/* ==========================================================================
   Code block — design.md code-block
   ========================================================================== */

.code-block {
  background: #141414;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: clamp(14px, 2cqh, 20px) clamp(16px, 2.5cqh, 24px);
  font-family: ui-monospace, Menlo, Monaco, Consolas, monospace;
  font-size: clamp(15px, 2.1cqh, 20px);
  line-height: 1.5;
  color: var(--ink-secondary);
}

/* ==========================================================================
   Tags & chips — pill-tag-soft / pill-tag-green
   ========================================================================== */

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tag {
  font-size: clamp(13px, 1.9cqh, 16px);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  background: var(--canvas-night-lift);
  border: 1px solid var(--hairline);
  color: var(--ink-mute);
}

.tag--accent {
  background: var(--primary-muted);
  border-color: rgba(62, 207, 142, 0.2);
  color: var(--primary);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.chip {
  font-size: clamp(13px, 1.9cqh, 16px);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: var(--canvas-night-lift);
  border: 1px solid var(--hairline);
  color: var(--ink-mute);
  white-space: nowrap;
}

.chip--accent {
  background: var(--primary-muted);
  border-color: rgba(62, 207, 142, 0.2);
  color: var(--primary);
}

/* ==========================================================================
   Lists
   ========================================================================== */

.list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: clamp(5px, 0.8vmin, 9px);
}

.list li {
  position: relative;
  padding-left: 20px;
  font-size: clamp(16px, 2.3cqh, 22px);
  line-height: 1.45;
  color: var(--ink-secondary);
}

.list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--primary);
}

/* ==========================================================================
   Grids
   ========================================================================== */

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(12px, 2vmin, 24px);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(10px, 1.5cqh, 16px);
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(8px, 1.2vmin, 14px);
}

.grid-factors {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(10px, 1.5cqh, 16px);
}

.factor {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: clamp(14px, 2.2cqh, 22px) clamp(16px, 2.5cqh, 24px);
  background: var(--canvas-night-soft);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  font-size: clamp(16px, 2.4cqh, 22px);
  font-weight: 500;
  color: var(--ink-secondary);
  line-height: 1.3;
}

.factor::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--primary);
  flex-shrink: 0;
}

.factor--muted::before {
  background: var(--ink-faint);
}

/* ==========================================================================
   Compare / split panels
   ========================================================================== */

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(12px, 2vmin, 24px);
  height: 100%;
}

.split__panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.split__label {
  font-size: clamp(17px, 2.5cqh, 22px);
  font-weight: 500;
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--hairline);
  color: var(--ink-secondary);
}

.split__label--accent {
  border-bottom-color: var(--primary);
  color: var(--primary);
}

/* Myth vs Reality — monocromático com emerald */
.contrast {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: clamp(16px, 2.5vmin, 28px);
  align-items: stretch;
}

.contrast__panel {
  padding: clamp(16px, 2.5vmin, 28px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline);
  background: var(--canvas-night-soft);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-sm);
}

.contrast__panel--accent {
  border-color: rgba(62, 207, 142, 0.22);
  background: rgba(62, 207, 142, 0.04);
}

.contrast__divider {
  display: flex;
  align-items: center;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

/* ==========================================================================
   Diagramas
   ========================================================================== */

.diagram {
  display: block;
  width: min(100%, 960px);
  height: auto;
  max-height: clamp(180px, 36cqh, 420px);
  object-fit: contain;
  object-position: center;
  margin: 0 auto;
}

.diagram-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(10px, 1.5cqh, 20px) 0;
  width: 100%;
  flex: 1;
  min-height: clamp(160px, 28cqh, 320px);
}

.slide-body--diagram .diagram-wrap {
  flex: 1;
  min-height: clamp(180px, 32cqh, 360px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-body--diagram .diagram {
  width: min(96%, 980px);
  max-height: min(38cqh, 400px);
}

/* ==========================================================================
   Cover slide
   ========================================================================== */

.cover {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: clamp(14px, 2.5vmin, 28px);
  max-width: 82%;
}

.cover__logo {
  height: clamp(18px, 2.4vmin, 26px);
  opacity: 0.9;
}

.cover__rule {
  width: 40px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

.cover__subtitle {
  color: var(--ink-mute);
  max-width: 520px;
}

/* ==========================================================================
   Instructor slide
   ========================================================================== */

.instructor {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(20px, 3vmin, 40px);
  height: 100%;
  align-items: center;
}

.instructor__name {
  font-size: clamp(24px, 3vmin, 36px);
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.15;
}

.instructor__name span {
  color: var(--primary);
}

.instructor__role {
  margin: var(--space-xs) 0 var(--space-md);
  color: var(--ink-mute);
  font-size: clamp(11px, 1.2vmin, 14px);
}

.instructor__bio {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.instructor__bio .body-md {
  font-size: clamp(14px, 2cqh, 18px);
  line-height: 1.45;
}

.instructor__bio .body-sm {
  font-size: clamp(13px, 1.8cqh, 16px);
}

.list--spacious li {
  font-size: clamp(17px, 2.5cqh, 22px);
  line-height: 1.5;
}

.instructor__photo-frame {
  position: relative;
  height: 100%;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.instructor__photo-frame::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 75%;
  height: 55%;
  background: radial-gradient(ellipse, rgba(62, 207, 142, 0.12), transparent 70%);
  pointer-events: none;
}

.instructor__photo {
  position: relative;
  z-index: 1;
  max-height: 100%;
  max-width: 100%;
  object-fit: contain;
  object-position: bottom center;
}

/* ==========================================================================
   Feature tiles
   ========================================================================== */

.tile {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tile__title {
  font-size: clamp(16px, 2.4cqh, 22px);
  font-weight: 500;
  color: var(--ink);
}

.tile__title--accent {
  color: var(--primary);
}

.tile__desc {
  font-size: clamp(14px, 2cqh, 18px);
  color: var(--ink-mute);
  line-height: 1.4;
}

/* ==========================================================================
   ACID / letter cards
   ========================================================================== */

.letter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(10px, 1.5cqh, 16px);
}

.letter-card {
  text-align: center;
  padding: clamp(16px, 2.5cqh, 24px) clamp(12px, 1.8cqh, 16px);
}

.letter-card__char {
  font-size: clamp(28px, 4.5cqh, 40px);
  font-weight: 500;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

/* ==========================================================================
   Scenario cards
   ========================================================================== */

.scenarios {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(10px, 1.5vmin, 16px);
}

.scenario__title {
  font-weight: 500;
  font-size: clamp(16px, 2.3cqh, 20px);
  margin-bottom: 8px;
}

.scenario__stack {
  font-family: ui-monospace, Menlo, Monaco, Consolas, monospace;
  font-size: clamp(14px, 2cqh, 18px);
  color: var(--primary);
}

/* ==========================================================================
   Checklist
   ========================================================================== */

.checklist {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(6px, 1vmin, 10px) clamp(16px, 2.5vmin, 32px);
}

.checklist__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  font-size: clamp(15px, 2.1cqh, 20px);
  color: var(--ink-secondary);
  line-height: 1.4;
}

.checklist__item::before {
  content: '';
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 4px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-xs);
  background: var(--canvas-night-lift);
}

/* ==========================================================================
   Big message
   ========================================================================== */

.statement {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(16px, 2.5vmin, 28px);
  height: 100%;
}

.statement__quote {
  font-size: clamp(24px, 4cqh, 38px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.02em;
  max-width: 88%;
}

.statement__quote em {
  font-style: normal;
  color: var(--primary);
}

/* ==========================================================================
   Stack list
   ========================================================================== */

.stack-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stack-list__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: clamp(11px, 1.15vmin, 13px);
  color: var(--ink-secondary);
}

.stack-list__item::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--primary);
  flex-shrink: 0;
}

/* CAP slide */
.cap-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.cap-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  text-align: left;
}

.cap-item .letter-card__char {
  margin: 0;
  flex-shrink: 0;
}

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.mb-sm { margin-bottom: clamp(6px, 1cqh, 10px); }
.mt-sm { margin-top: clamp(8px, 1.2cqh, 12px); }
.mt-md { margin-top: clamp(10px, 1.5cqh, 16px); }
.mt-lg { margin-top: var(--space-lg); }
.mb-md { margin-bottom: clamp(10px, 1.5cqh, 16px); }
.mb-lg { margin-bottom: clamp(14px, 2cqh, 24px); }
.text-center { text-align: center; }

.title-centered {
  max-width: 85%;
  margin-inline: auto;
  text-align: center;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.nav {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(to top, rgba(28, 28, 28, 0.97) 40%, transparent);
  z-index: 10;
}

.nav__btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--hairline);
  background: var(--canvas-night-soft);
  color: var(--ink-mute);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.nav__btn:hover:not(:disabled) {
  border-color: var(--hairline-strong);
  color: var(--ink);
  background: var(--canvas-night-lift);
}

.nav__btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.nav__btn svg {
  width: 14px;
  height: 14px;
}

.nav__counter {
  font-size: 13px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
}

.progress {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--hairline);
  z-index: 11;
}

.progress__fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.45s var(--ease-out);
  width: 0%;
}

/* ==========================================================================
   Responsive (telas estreitas / preview mobile)
   ========================================================================== */

@media (max-width: 900px) {
  .grid-4,
  .grid-factors {
    grid-template-columns: repeat(2, 1fr);
  }

  .instructor {
    grid-template-columns: 1fr;
  }

  .instructor__photo-frame {
    max-height: 30%;
  }

  .contrast {
    grid-template-columns: 1fr;
  }

  .contrast__divider {
    display: none;
  }

  .checklist {
    grid-template-columns: 1fr;
  }

  .letter-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}