.intro {
  color: var(--ink);
  margin: 0 0 56px;
}

.intro .intro-hero {
  touch-action: pan-y pinch-zoom;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
  align-items: center;
  gap: 64px;
  padding: 72px 0 64px;
}

.intro .eyebrow {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 22px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: .1em;
}

.intro .intro-dot {
  display: inline-block;
  flex: 0 0 6px;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-round);
  background: var(--accent);
}

.intro #intro-title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(36px, 4.3vw, 56px);
  line-height: 1.36;
  font-weight: 500;
  letter-spacing: -.02em;
  text-wrap: balance;
}

.intro .intro-lead {
  max-width: 440px;
  margin: 24px 0 0;
  color: var(--ink-2);
  font-size: 16px;
  line-height: 1.95;
}

.intro .intro-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px 24px;
  margin: 30px 0 14px;
}

.intro .intro-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-compact);
  background: var(--accent);
  color: var(--on-accent);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: background .16s ease, border-color .16s ease;
}

.intro .intro-cta:hover {
  border-color: var(--accent-hover);
  background: var(--accent-hover);
}

.intro .intro-secondary {
  color: var(--accent-hover);
  font-size: 13px;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.intro button.intro-trial {
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: var(--radius-flat);
  background: none;
  color: var(--accent-hover);
  font: inherit;
  font-size: 13px;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.intro button.intro-trial:hover {
  background: none;
}

.intro a:focus-visible,
.intro button.intro-trial:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
}

.intro .intro-audience {
  margin: 0;
  color: var(--ink-2);
  font-size: 12px;
}

.intro .intro-trial-note {
  max-width: 440px;
  margin: 6px 0 0;
  color: var(--ink-2);
  font-size: 12px;
}

.intro .intro-example {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: 16px 12px 0;
}

.intro .intro-example::before {
  content: "";
  position: absolute;
  inset: 0 0 50px;
  z-index: 0;
  border-radius: var(--radius-large);
  background: var(--soft);
}

.intro .sample-note {
  position: relative;
  z-index: 1;
  padding: 20px 20px 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-2);
  background-image:
    linear-gradient(var(--note-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--note-grid) 1px, transparent 1px);
  background-size: 22px 22px;
  box-shadow: 0 10px 32px rgba(var(--shadow-rgb),.04), 0 2px 4px rgba(var(--shadow-rgb),.02);
}

.intro .sample-topline,
.intro .sample-bottomline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 11px;
}

.intro .sample-topline {
  min-height: 52px;
  padding-right: 68px;
  color: var(--ink-2);
}

.intro .sample-status {
  position: absolute;
  top: 22px;
  right: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 3px;
  border: 3px solid var(--accent);
  border-radius: var(--radius-xs);
  color: var(--accent);
  font-family: var(--kai);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  transform: rotate(-7deg);
}

.intro .sample-subject {
  margin: 25px 0 9px;
  color: var(--ink-2);
  font-size: 11px;
  font-weight: 550;
  letter-spacing: .035em;
}

.intro .sample-note h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: -.025em;
}

.intro .sample-code {
  margin: 18px 0;
  padding: 12px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-2);
  color: var(--ink);
  font: 12px/1.8 Consolas, Monaco, monospace;
}

.intro .sample-code code span { color: var(--accent); }

.intro .sample-code-line {
  position: relative;
  display: inline-block;
  padding-bottom: 5px;
}

.intro .sample-underline {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 10px;
  pointer-events: none;
}

.intro .sample-mistake {
  margin: 18px 0;
  padding-left: 12px;
  border-left: 2px solid var(--accent);
}

.intro .sample-mistake p {
  margin: 6px 0 0;
  color: var(--ink-2);
  font-size: 12px;
  line-height: 1.8;
}

.intro .sample-mistake .sample-label {
  margin: 0;
  color: var(--accent);
  font-size: 11px;
  font-weight: 650;
}

.intro .sample-next {
  display: flex;
  align-items: flex-start;
  gap: 7px;
  margin: 20px 0;
  color: var(--accent);
  font-family: var(--kai);
  font-size: 17px;
  transform: rotate(-2deg);
  transform-origin: left;
}

.intro .sample-check { color: var(--accent); }

.intro .sample-bottomline {
  margin: 0 -20px;
  padding: 12px 20px;
  border-top: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 11px;
}

.intro .intro-example figcaption {
  position: relative;
  margin-top: 13px;
  color: var(--ink-2);
  font-size: 11px;
  text-align: center;
}

.intro .intro-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

.intro .intro-steps,
.intro .intro-difference {
  min-width: 0;
  padding: var(--space-6);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.intro .intro-step {
  position: relative;
  min-width: 0;
}

.intro .intro-step + .intro-step::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(-1 * var(--space-4));
  border-left: 1px solid var(--line);
  content: "";
}

.intro .intro-step-number {
  margin-right: var(--space-2);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 36px;
  font-weight: 500;
  line-height: 1.2;
}

.intro .intro-step-label {
  color: var(--accent);
  font-size: var(--text-xs);
}

.intro .intro-step h3 {
  margin: var(--space-3) 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: var(--text-xl);
  font-weight: 500;
}

.intro .intro-step p {
  max-width: var(--measure);
  margin: 0;
  color: var(--ink-2);
  font-size: 13px;
  line-height: 1.9;
}

.intro .intro-difference {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.5fr);
  align-items: start;
  gap: var(--space-6);
  margin-top: var(--space-6);
}

.intro .intro-difference > div {
  min-width: 0;
}

.intro .intro-difference .eyebrow {
  margin: 0 0 12px;
  font-size: 11px;
}

.intro .intro-difference h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: var(--text-3xl);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: -.02em;
}

.intro .intro-difference-copy > p {
  max-width: var(--measure);
  margin: 0;
  color: var(--ink-2);
  font-size: 13px;
  line-height: 2;
}

.intro .intro-difference-copy .intro-small {
  margin-top: 16px;
  color: var(--ink-2);
  font-size: 11px;
}

.intro .intro-invitation {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding: var(--space-6) 0 0;
  border-top: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 12px;
}

.intro .intro-invitation > span:not(.intro-dot) {
  flex: 1 1 200px;
  min-width: 0;
  overflow-wrap: anywhere;
}

.intro .intro-invitation .fx-toggle {
  flex-shrink: 0;
  margin-left: auto;
}

/* Only a visible, motion-enabled opening receives these initial states. */
@media (prefers-reduced-motion: no-preference) {
  #intro.intro-anim .intro-char {
    display: inline-block;
    opacity: 0;
    filter: blur(8px);
    transform: translateY(6px);
    animation: intro-ink .7s ease-out var(--ink-delay, 0ms) both;
  }

  #intro.intro-anim .sample-note {
    opacity: 0;
    transform: translateY(12px);
    animation: intro-note .5s ease-out .5s both;
  }

  #intro.intro-anim .sample-underline .pen {
    stroke-dasharray: 1;
    stroke-dashoffset: 1;
    animation: intro-pen .7s ease-out 1s both;
  }

  #intro.intro-anim .sample-next {
    opacity: 0;
    animation: intro-annotation .4s ease-out 1.5s both;
  }

  #intro.intro-anim .sample-status {
    opacity: 0;
    transform: scale(2.3) rotate(-18deg);
    animation: intro-seal .45s cubic-bezier(.2,.9,.3,1) 1.9s both;
  }

  @keyframes intro-ink {
    from { opacity: 0; filter: blur(8px); transform: translateY(6px); }
    to { opacity: 1; filter: blur(0); transform: translateY(0); }
  }

  @keyframes intro-note {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
  }

  @keyframes intro-pen {
    from { stroke-dashoffset: 1; }
    to { stroke-dashoffset: 0; }
  }

  @keyframes intro-annotation {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  @keyframes intro-seal {
    0% { opacity: 0; transform: scale(2.3) rotate(-18deg); }
    65% { opacity: 1; transform: scale(.92) rotate(-7deg); }
    100% { opacity: 1; transform: scale(1) rotate(-7deg); }
  }
}

@media (max-width: 960px) {
  .intro .intro-hero { gap: 30px; padding-top: 48px; }
  .intro .intro-example { padding: 18px 14px 0; }
  .intro .sample-note { padding: 22px 22px 0; }
  .intro .sample-bottomline { margin: 0 -22px; padding: 13px 22px; }
  .intro .intro-links { gap: 16px; }
}

@media (max-width: 720px) {
  .intro { margin-bottom: 32px; }
  .intro .intro-hero { grid-template-columns: 1fr; gap: 38px; padding: 40px 0 32px; }
  .intro #intro-title { font-size: clamp(32px, 7.8vw, 46px); }
  .intro .intro-lead { max-width: 500px; font-size: 14px; }
  .intro .intro-example { width: 100%; max-width: 450px; margin: 0 auto; }
  .intro .sample-note h3 { font-size: 24px; }
  .intro .intro-steps { grid-template-columns: 1fr; }
  .intro .intro-step + .intro-step::before {
    top: calc(-1 * var(--space-4));
    right: 0;
    bottom: auto;
    left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .intro .intro-difference { grid-template-columns: 1fr; }
  .intro .intro-difference h3 br { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .intro .intro-cta { transition: none; }
}

/* Add paper only while the landscape runs; the example and its code stay opaque. */
@supports (background: color-mix(in srgb, white 50%, transparent)) {
  html[data-cursor-fx="ripple"] .intro :is(
    .intro-hero .intro-copy, .intro-steps, .intro-difference
  ) {
    background: color-mix(in srgb, var(--paper) var(--fx-panel-opacity, 88%), transparent);
  }
  html[data-cursor-fx="ripple"] .intro .intro-hero .intro-copy {
    min-width: 0;
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
  }

  @media (hover: none), (pointer: coarse) {
    html[data-cursor-fx="ripple"] .intro :is(
      .intro-hero .intro-copy, .intro-steps, .intro-difference
    ) {
      background: color-mix(in srgb, var(--paper) 92%, transparent);
    }
  }
  @media (hover: hover) and (pointer: fine) {
    html[data-cursor-fx="ripple"] .intro :is(
      .intro-hero .intro-copy, .intro-steps, .intro-difference
    ) {
      -webkit-backdrop-filter: blur(8px);
      backdrop-filter: blur(8px);
    }
  }
  @media (max-width: 780px) {
    html[data-cursor-fx="ripple"] .intro .intro-hero .intro-copy { padding: 18px; }
  }
  @media (max-width: 380px) {
    html[data-cursor-fx="ripple"] .intro .intro-hero .intro-copy { padding: 16px; }
  }
}