/* =========================================================
   Diction Masters — landing page (page-specific sections)
   Shared tokens, reset, buttons, header and footer live in
   base.css, loaded before this file.
   ========================================================= */

/* ---------- hero: the open notebook ---------- */

.hero {
  background: var(--parchment);
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px);
  background-size: 100% 42px;
  background-position: 0 96px;
  padding: 72px 0 88px;
}

.hero__book {
  display: grid;
  grid-template-columns: 1.15fr 40px 1fr;
  align-items: start;
  gap: 0 8px;
}

.hero__spine {
  align-self: stretch;
  border-left: 2px dashed var(--gold);
  opacity: 0.55;
}

.hero__page--left { padding-right: 20px; }
.hero__page--right { padding-left: 12px; padding-top: 6px; }

.hero__headline {
  font-size: clamp(2.1rem, 4.3vw, 3.05rem);
  letter-spacing: -0.01em;
}
.hero__headline-line { display: block; color: var(--gold-deep); font-style: italic; font-weight: 500; }

.hero__sub {
  margin-top: 22px;
  font-size: 1.08rem;
  color: var(--ink-70);
  max-width: 46ch;
}

.hero__actions {
  margin-top: 32px;
  display: flex;
  align-items: center;
  gap: 26px;
  flex-wrap: wrap;
}

.hero__stats {
  margin: 48px 0 0;
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}
.hero__stat dt {
  font-family: var(--font-serif);
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--ink);
}
.hero__stat dd {
  margin: 2px 0 0;
  font-size: 0.85rem;
  color: var(--ink-70);
  max-width: 16ch;
}

/* the lesson card mock, like a flashcard clipped to the right page */

.lesson-card {
  background: var(--paper-white);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: 0 18px 40px -22px rgba(11, 26, 74, 0.35);
  padding: 30px 30px 26px;
  max-width: 400px;
}

.lesson-card__label {
  font-size: 0.82rem;
  color: var(--ink-40);
}
.lesson-card__word {
  font-size: 2.1rem;
  margin-top: 6px;
}
.lesson-card__ipa {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--gold-deep);
  margin-top: 4px;
  font-size: 1.05rem;
}

.lesson-card__row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}
.lesson-card__control {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--ink-40);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink);
  flex: none;
}
.lesson-card__control--mic { color: var(--maroon); border-color: var(--maroon); }
.lesson-card__row-label { font-weight: 600; font-size: 0.92rem; }
.lesson-card__wave { color: var(--gold); margin-left: auto; width: 110px; height: 22px; }

.lesson-card__note {
  margin-top: 20px;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--ink);
  font-size: 1rem;
  border-bottom: 2px solid var(--gold-tint);
  padding-bottom: 14px;
}
.lesson-card__signature {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--ink-40);
}

@media (max-width: 900px) {
  .hero__book { grid-template-columns: 1fr; }
  .hero__spine { display: none; }
  .hero__page--right { padding: 40px 0 0; }
  .lesson-card { max-width: 420px; }
}

/* ---------- how it works ---------- */

.steps { padding: 96px 0; background: var(--paper-white); }

.section-title {
  font-size: clamp(1.6rem, 2.8vw, 2.1rem);
  max-width: 20ch;
}
.section-title--on-parchment { color: var(--ink); }

.section-lede {
  margin-top: 14px;
  color: var(--ink-70);
  font-size: 1.05rem;
  max-width: 56ch;
}

.steps__list {
  list-style: none;
  margin: 56px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}
.steps__item {
  padding: 0 24px 0 0;
  border-top: 1px solid var(--rule);
  padding-top: 22px;
}
.steps__item + .steps__item { border-left: 1px solid var(--rule); padding-left: 24px; }

.steps__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1.4px solid var(--gold);
  color: var(--gold-deep);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
}
.steps__title {
  margin-top: 18px;
  font-size: 1.08rem;
}
.steps__body {
  margin-top: 10px;
  color: var(--ink-70);
  font-size: 0.96rem;
}

@media (max-width: 860px) {
  .steps__list { grid-template-columns: 1fr; gap: 28px; }
  .steps__item, .steps__item + .steps__item { border-left: none; padding-left: 0; }
}

/* ---------- features: alternating margin notes on a thread ---------- */

.features { padding: 20px 0 100px; background: var(--paper-white); position: relative; }

.features__thread {
  display: none;
}

.features__list {
  margin-top: 56px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.feature-row {
  display: grid;
  grid-template-columns: 1fr;
  padding: 34px 0;
  border-top: 1px dashed var(--rule);
  position: relative;
}
.feature-row:last-child { border-bottom: 1px dashed var(--rule); }

.feature-row__content { max-width: 560px; }
.feature-row--right .feature-row__content { margin-left: auto; text-align: right; }

.feature-row__eyebrow {
  color: var(--gold-deep);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
}
.feature-row__title {
  margin-top: 8px;
  font-size: 1.5rem;
  max-width: 26ch;
}
.feature-row--right .feature-row__title { margin-left: auto; }

.feature-row__body {
  margin-top: 12px;
  color: var(--ink-70);
  max-width: 46ch;
}
.feature-row--right .feature-row__body { margin-left: auto; }

.feature-row__mark { display: none; }

@media (max-width: 700px) {
  .feature-row--right .feature-row__content,
  .feature-row--right .feature-row__title,
  .feature-row--right .feature-row__body {
    margin-left: 0;
    text-align: left;
  }
}

/* ---------- chalkboard stats band ---------- */

.chalkboard {
  background: var(--green);
  background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 5px 5px;
  color: var(--parchment);
  padding: 76px 0;
}

.chalkboard__inner { text-align: center; }

.chalkboard__line {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  max-width: 42ch;
  margin: 0 auto;
  color: var(--parchment);
}

.chalkboard__figures {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
}

.chalkboard__figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.chalkboard__number {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 600;
  color: var(--gold);
}
.chalkboard__label {
  font-size: 0.9rem;
  color: rgba(242, 245, 252, 0.72);
  max-width: 22ch;
}

@media (max-width: 700px) {
  .chalkboard__figures { grid-template-columns: 1fr; gap: 32px; }
}

/* ---------- testimonial ---------- */

.testimonial {
  padding: 96px 0;
  background: var(--parchment-deep);
  text-align: center;
}
.testimonial__quote {
  margin: 0 auto;
  max-width: 58ch;
  font-family: var(--font-serif);
  font-weight: 500;
  font-style: italic;
  font-size: clamp(1.3rem, 2.6vw, 1.7rem);
  color: var(--ink);
}
.testimonial__attribution {
  margin-top: 22px;
  display: inline-block;
  font-size: 0.9rem;
  color: var(--ink-70);
  border-bottom: 2px solid var(--gold);
  padding-bottom: 4px;
}

/* ---------- CTA for schools ---------- */

.cta-band { background: var(--paper-white); padding: 100px 0; }
.cta-band__inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
  background: var(--parchment);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 56px;
}
.cta-band__actions { text-align: left; }
.cta-band__note { margin-top: 16px; font-size: 0.9rem; color: var(--ink-70); }

@media (max-width: 780px) {
  .cta-band__inner { grid-template-columns: 1fr; padding: 40px 28px; }
}


/* =========================================================
   Motion — everything below is driven by the phonemic chart.
   Two rules hold throughout: only transform and opacity are
   animated (so nothing forces layout while scrolling), and
   every effect is switched off under prefers-reduced-motion.
   ========================================================= */

/* ---------- the 44 symbols drifting behind the hero ---------- */

.hero { position: relative; overflow: hidden; }
.hero__book { position: relative; z-index: 1; }

.phoneme-drift {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
/* Position, size and timing all come from the view — see
   _drift_layer() for why they are not computed in CSS. */
.phoneme-drift__glyph {
  position: absolute;
  top: 100%;
  font-family: var(--font-serif);
  color: var(--ink);
  opacity: 0;
  will-change: transform, opacity;
  animation-name: phoneme-rise;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
@keyframes phoneme-rise {
  0%   { transform: translate3d(0, 0, 0) rotate(-4deg); opacity: 0; }
  12%  { opacity: 0.1; }
  80%  { opacity: 0.1; }
  100% { transform: translate3d(var(--sway, 20px), -118vh, 0) rotate(5deg); opacity: 0; }
}
/* Half as many glyphs on a phone — these are cheap to animate but
   there is no sense running 44 of them on a low-end handset. */
@media (max-width: 720px) {
  .phoneme-drift__glyph:nth-child(even) { display: none; }
}

/* ---------- the hero card: word and transcription cycling ---------- */

.lesson-card__stack {
  position: relative;
  /* Reserve the tallest slide's height so the card never jumps. */
  min-height: 92px;
}
.lesson-card__notes { position: relative; min-height: 64px; }

.word-slide {
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.lesson-card__stack .word-slide,
.lesson-card__notes .word-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
}
.lesson-card__stack .word-slide--on,
.lesson-card__notes .word-slide--on {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

/* Each symbol of the transcription is wrapped by the script and
   written on in turn, like a teacher filling it in on the board. */
.ipa-glyph {
  display: inline-block;
  opacity: 0;
  transform: translateY(6px);
}
.word-slide--on .ipa-glyph {
  animation: ipa-write 0.42s ease-out forwards;
  animation-delay: calc(var(--g) * 45ms);
}
@keyframes ipa-write {
  from { opacity: 0; transform: translateY(6px) scale(0.9); }
  to   { opacity: 1; transform: none; }
}

/* A caret that runs along under the transcription as it is written. */
.lesson-card__ipa { position: relative; }
.word-slide--on .lesson-card__ipa::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  height: 2px;
  width: 100%;
  background: linear-gradient(90deg, var(--gold), transparent);
  transform-origin: left center;
  animation: ipa-underline 1.1s ease-out forwards;
}
@keyframes ipa-underline {
  from { transform: scaleX(0); opacity: 0.9; }
  to   { transform: scaleX(1); opacity: 0; }
}

/* Level meter beside the waveform, so "Listen" looks live. */
.lesson-card__bars {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 18px;
  margin-left: 8px;
}
.lesson-card__bars i {
  display: block;
  width: 3px;
  height: 100%;
  border-radius: 2px;
  background: var(--gold);
  transform-origin: bottom center;
  transform: scaleY(0.25);
  animation: bar-pulse 1.1s ease-in-out infinite;
  animation-delay: calc(var(--b) * 120ms);
}
@keyframes bar-pulse {
  0%, 100% { transform: scaleY(0.25); }
  50%      { transform: scaleY(1); }
}

/* ---------- the ribbon of all 44 sounds ---------- */

.ribbon {
  background: var(--ink);
  padding: 16px 0;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.ribbon__track {
  display: flex;
  width: max-content;
  animation: ribbon-scroll 70s linear infinite;
}
.ribbon:hover .ribbon__track { animation-play-state: paused; }
.ribbon__run { display: flex; }
.ribbon__glyph {
  flex: 0 0 auto;
  padding: 4px 20px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--parchment);
  opacity: 0.55;
  transition: opacity 0.2s ease, color 0.2s ease;
}
.ribbon__glyph:hover { opacity: 1; color: var(--gold); }
@keyframes ribbon-scroll {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(-50%, 0, 0); }
}

/* ---------- reveal on scroll ---------- */

/* Only hide things once the script has confirmed it is running, so a
   browser with JS off still shows the whole page. */
.js-motion .reveal {
  opacity: 0;
  transform: translateY(18px);
}
.js-motion .reveal--in {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  transition-delay: calc(var(--d, 0) * 90ms);
}

/* ---------- respect a reduced-motion preference ---------- */

@media (prefers-reduced-motion: reduce) {
  .phoneme-drift { display: none; }
  .ribbon__track { animation: none; }
  .lesson-card__bars i { animation: none; transform: scaleY(0.6); }
  .word-slide { transition: none; }
  .word-slide--on .ipa-glyph { animation: none; opacity: 1; transform: none; }
  .word-slide--on .lesson-card__ipa::after { animation: none; opacity: 0; }
  .js-motion .reveal { opacity: 1; transform: none; }
  .js-motion .reveal--in { transition: none; }
}