:root {
  --bg: #f3f4f1;
  --bg-deep: #e4e8e3;
  --ink: #141816;
  --muted: #5a635c;
  --accent: #1a5c54;
  --accent-soft: #d7e6e2;
  --do: #1a5c54;
  --do-bg: #e7f2ef;
  --dont: #8a3b2e;
  --dont-bg: #f6ebe8;
  --surface: #ffffff;
  --line: rgba(20, 24, 22, 0.12);
  --font-sans: "DM Sans", system-ui, sans-serif;
  --font-display: "Newsreader", Georgia, serif;
  --chrome-h: 3.25rem;
  --controls-h: 4.5rem;
}

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

html,
body {
  height: 100%;
  margin: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #ffffff 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, var(--accent-soft) 0%, transparent 45%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--surface);
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip:focus {
  left: 0.75rem;
  top: 0.75rem;
}

.chrome {
  position: fixed;
  inset: 0 0 auto;
  height: var(--chrome-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding: 0 1.25rem;
  border-bottom: 1px solid var(--line);
  background: rgba(243, 244, 241, 0.88);
  backdrop-filter: blur(10px);
  z-index: 20;
}

.brand {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent);
  text-decoration: none;
}

.chrome-title {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.chrome-count {
  margin: 0;
  justify-self: end;
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  color: var(--muted);
}

.deck {
  height: 100%;
  padding: calc(var(--chrome-h) + 0.5rem) 1.25rem calc(var(--controls-h) + 1.5rem);
  outline: none;
}

.slide {
  height: 100%;
  display: none;
  align-items: center;
  justify-content: center;
}

.slide.is-active {
  display: flex;
  animation: in 280ms ease-out;
}

@keyframes in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.slide-inner {
  width: min(920px, 100%);
}

.slide-inner.split {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
}

.kicker {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

h1,
h2 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 4rem);
}

h2 {
  font-size: clamp(1.85rem, 4.5vw, 3rem);
}

.lede {
  margin: 0;
  max-width: 34rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.45;
  color: var(--muted);
}

.icon-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.75rem;
}

.icon-pill {
  display: inline-flex;
  align-items: center;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 0.9rem;
  font-weight: 500;
}

.term {
  appearance: none;
  display: inline;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border-bottom: 1.5px dashed rgba(26, 92, 84, 0.45);
  line-height: inherit;
}

.term:hover,
.term:focus-visible,
.term.is-open {
  border-bottom-style: solid;
  border-bottom-color: var(--accent);
  outline: none;
}

button.term.icon-pill {
  display: inline-flex;
  padding: 0.45rem 0.85rem;
  border: 1px solid rgba(26, 92, 84, 0.28);
  border-bottom: 1px solid rgba(26, 92, 84, 0.28);
  background: var(--surface);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
}

button.term.icon-pill.is-open,
button.term.icon-pill:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.term-hint {
  margin-top: 0.85rem;
}

.glossary {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: end center;
  padding: 1rem 1rem calc(var(--controls-h) + 0.75rem);
  background: rgba(20, 24, 22, 0.28);
}

.glossary[hidden] {
  display: none;
}

.glossary-card {
  position: relative;
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1.25rem 1.35rem 1.35rem;
  box-shadow: 0 22px 50px rgba(20, 24, 22, 0.18);
  animation: in 220ms ease-out;
}

.glossary-kicker {
  margin: 0 0 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.glossary-card h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
}

.glossary-card p#glossary-body {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.45;
}

.glossary-close {
  position: absolute;
  top: 0.65rem;
  right: 0.75rem;
  width: 2rem;
  height: 2rem;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
}

.glossary-close:hover {
  color: var(--ink);
  background: var(--bg);
}

.visual {
  justify-self: center;
  text-align: center;
}

.visual-icon {
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 1.75rem 1.5rem 1.25rem;
  box-shadow: 0 18px 40px rgba(20, 24, 22, 0.06);
}

.visual-icon.accent {
  color: var(--accent);
  background: linear-gradient(160deg, #fff 0%, var(--accent-soft) 100%);
}

.visual-caption {
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.visual-photo {
  margin: 0;
}

.visual-photo img {
  display: block;
  width: min(320px, 100%);
  height: auto;
  border-radius: 24px;
  border: 1px solid var(--line);
  box-shadow: 0 22px 50px rgba(20, 24, 22, 0.12);
  object-fit: cover;
  background: #ddd;
}

.plain-list {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.plain-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1rem 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  font-size: 1.05rem;
  line-height: 1.35;
}

.mark {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--accent);
}

.steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  counter-reset: step;
  display: grid;
  gap: 0.85rem;
}

.steps li {
  counter-increment: step;
  display: grid;
  gap: 0.2rem;
  padding: 1.1rem 1.2rem 1.1rem 4rem;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 1.1rem;
  top: 1.15rem;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
}

.steps strong {
  font-size: 1.1rem;
}

.steps span {
  color: var(--muted);
  font-size: 0.98rem;
}

.link-line {
  margin: 1.5rem 0 0;
}

.link-line a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(26, 92, 84, 0.35);
}

.link-line a:hover {
  border-bottom-color: var(--accent);
}

.fine {
  margin: 1.25rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.plain-list strong {
  color: var(--ink);
  font-weight: 600;
}

.do-list,
.dont-list {
  list-style: none;
  margin: 1.35rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.do-list li,
.dont-list li {
  position: relative;
  padding: 0.95rem 1.1rem 0.95rem 2.75rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-size: 1.05rem;
  line-height: 1.35;
}

.do-list li {
  background: var(--do-bg);
  border-color: rgba(26, 92, 84, 0.18);
}

.dont-list li {
  background: var(--dont-bg);
  border-color: rgba(138, 59, 46, 0.16);
}

.do-list li::before,
.dont-list li::before {
  position: absolute;
  left: 0.95rem;
  top: 0.95rem;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: #fff;
}

.do-list li::before {
  content: "✓";
  background: var(--do);
}

.dont-list li::before {
  content: "✕";
  background: var(--dont);
}

.compare {
  margin-top: 1.35rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.compare-col {
  border-radius: 18px;
  border: 1px solid var(--line);
  padding: 1.15rem 1.2rem 1.25rem;
}

.compare-col.do {
  background: var(--do-bg);
  border-color: rgba(26, 92, 84, 0.18);
}

.compare-col.dont {
  background: var(--dont-bg);
  border-color: rgba(138, 59, 46, 0.16);
}

.compare-label {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.compare-col.do .compare-label {
  color: var(--do);
}

.compare-col.dont .compare-label {
  color: var(--dont);
}

.compare-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.compare-col li {
  font-size: 1.02rem;
  line-height: 1.35;
  padding-left: 0.9rem;
  position: relative;
}

.compare-col li::before {
  content: "·";
  position: absolute;
  left: 0;
  font-weight: 700;
}

.controls {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--controls-h);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0 1rem 0.75rem;
  background: linear-gradient(180deg, transparent, rgba(243, 244, 241, 0.95) 35%);
  z-index: 20;
}

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 999px;
  font-size: 1.15rem;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(20, 24, 22, 0.05);
}

.btn:hover {
  border-color: rgba(26, 92, 84, 0.35);
  color: var(--accent);
}

.btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.dots {
  display: flex;
  gap: 0.45rem;
  align-items: center;
}

.dot {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 999px;
  border: 0;
  padding: 0;
  background: rgba(20, 24, 22, 0.2);
  cursor: pointer;
}

.dot[aria-current="true"] {
  width: 1.35rem;
  background: var(--accent);
}

.hint {
  position: fixed;
  right: 1rem;
  bottom: 0.85rem;
  margin: 0;
  font-size: 0.72rem;
  color: rgba(90, 99, 92, 0.75);
  z-index: 21;
  pointer-events: none;
}

@media (max-width: 760px) {
  .slide-inner.split {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .visual-photo img {
    width: min(220px, 70vw);
    margin-inline: auto;
  }

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

  .do-list li,
  .dont-list li {
    font-size: 0.98rem;
  }

  .hint {
    display: none;
  }

  h1 {
    font-size: clamp(2rem, 9vw, 2.6rem);
  }

  h2 {
    font-size: clamp(1.55rem, 7vw, 2.1rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .slide.is-active {
    animation: none;
  }
}