/* 02 Builder: opener, VoiceAI, voice agents and the "call ended" hand-off.
   Shares tokens with hero.css and helpers (.tag, .chips, .opener) with
   chapters.css. Resting styles are the final, visible state; js/builder.js
   adds the motion. Pinning only happens under html.has-motion. */

/* ---------- Opener (only without motion; see index.html) ---------- */

.has-motion .b-opener {
  display: none;
}

.b-opener__lede {
  max-width: 15em;
  padding-bottom: 1.2rem;
  text-align: right;
}

.b-opener__line {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.6rem, 2.8vw, 2.6rem);
  line-height: 1;
  text-transform: uppercase;
}

.b-opener__line em {
  color: var(--accent);
  font-style: normal;
}

.b-opener__note {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: clamp(0.875rem, 1vw, 1rem);
  line-height: 1.4;
}

/* ---------- VoiceAI ---------- */

.voice {
  --card-pad: clamp(20px, 2.2vw, 30px);
  padding: 6vh 0 10vh;
}

.has-motion .voice.is-pinned {
  height: 230svh;
  padding: 0;
}

.voice__stage {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  align-items: center;
  gap: clamp(28px, 5vw, 80px);
}

.has-motion .voice.is-pinned .voice__stage {
  position: sticky;
  top: 0;
  height: 100svh;
  padding-top: 70px; /* clear of the navbar */
}

.voice__title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.4rem, 4.2vw, 4.2rem);
  font-weight: 400;
  line-height: 0.95;
  text-transform: uppercase;
  text-wrap: balance;
}

.voice__body {
  max-width: 30em;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.15vw, 1.0625rem);
  line-height: 1.55;
}

.voice__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.6rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.8125rem;
}

.voice__facts b {
  display: block;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(1.7rem, 2.4vw, 2.3rem);
  font-weight: 400;
  line-height: 1;
}

.voice__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 1.4rem;
}

.voice__chip {
  padding: 0.6em 1.05em;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: none;
  color: var(--ink);
  font: 500 0.8125rem/1 var(--body);
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}

.voice__chip:hover {
  border-color: var(--ink);
}

.voice__chip.is-on {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
}

.voice__chip:focus-visible,
.voice__play:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* The card: a page of text that becomes a player. */
.voice__card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: var(--card-pad);
  border-radius: 28px;
  background: var(--glow);
}

.voice__doc-title {
  margin: 0 0 14px;
  font-size: 0.9375rem;
  font-weight: 700;
}

.voice__wave {
  position: relative;
  height: clamp(110px, 17svh, 170px);
}

.voice__bar {
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 3px;
  background: color-mix(in srgb, var(--ink) 30%, transparent);
}

/* Once the player is ready, switching clips glides the bars to new heights. */
.voice.is-ready .voice__bar {
  transition: top 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), height 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), background-color 0.2s;
}

.voice__bar.is-lit {
  background: var(--accent);
}

.voice__lane {
  position: absolute;
  left: 0;
  margin: 0;
  padding-left: 8px; /* clear of the playhead at 0:00 */
  line-height: 14px;
  color: var(--muted);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.3s;
}

.voice.is-podcast .voice__lane {
  opacity: 1;
}

/* Script: a window of three lines; the one being spoken is lit. */
.voice__script {
  position: relative;
  height: calc(1.45em * 4 + 24px);
  margin-top: 18px;
  overflow: hidden;
  font-size: clamp(0.95rem, 1.1vw, 1.0625rem);
  line-height: 1.45;
  -webkit-mask-image: linear-gradient(transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(transparent, #000 12%, #000 88%, transparent);
}

.voice__lines {
  margin: 0;
  padding: 0;
  list-style: none;
  transition: transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* Each line is a button: click to jump the audio there. */
.voice__lines li {
  margin-bottom: 8px;
  overflow: hidden;
  color: color-mix(in srgb, var(--ink) 55%, transparent);
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
  transition: color 0.3s;
}

.voice__lines li:hover {
  color: var(--ink);
}

.voice__lines li.is-now {
  color: var(--ink);
  font-weight: 500;
  white-space: normal;
}

.voice__lines b {
  margin-right: 0.4em;
  color: var(--accent);
  font-size: 0.8em;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* The waveform doubles as the seek bar once the player is ready. */
.voice.is-ready .voice__wave {
  cursor: pointer;
  touch-action: none;
}

.voice__wave:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 6px;
  border-radius: 6px;
}

.voice__head {
  position: absolute;
  top: -6px;
  bottom: -6px;
  left: 0;
  width: 2px;
  border-radius: 2px;
  background: var(--ink);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

.voice.is-ready.has-started .voice__head {
  opacity: 1;
}

/* "Back 10s": a small pill, icon then label, so nothing overlaps. */
.voice__back {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 40px;
  padding: 0 14px 0 11px;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: none;
  color: var(--ink);
  font: 700 0.8125rem/1 var(--body);
  cursor: pointer;
}

.voice__back:hover {
  border-color: var(--ink);
}

.voice__back svg {
  width: 17px;
  height: 17px;
}

.voice__back:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.voice__player {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 14px;
}

.voice__play {
  flex: none;
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--ink);
  color: var(--bg);
  cursor: pointer;
  box-shadow: 0 0 0 calc(var(--level, 0) * 14px) color-mix(in srgb, var(--accent) 38%, transparent);
  transform: scale(calc(1 + var(--level, 0) * 0.12));
}

.voice__play svg {
  width: 22px;
  height: 22px;
}

.voice__icon-pause,
.voice.is-playing .voice__icon-play {
  display: none;
}

.voice.is-playing .voice__icon-pause {
  display: block;
}

.voice__meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
}

/* ---------- Voice agents ---------- */

.agents {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  gap: clamp(28px, 5vw, 80px);
  padding: 10vh 0 12vh;
}

.agents__title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.3rem, 3.9vw, 3.9rem);
  font-weight: 400;
  line-height: 0.95;
  text-transform: uppercase;
  text-wrap: balance;
}

.agents__body {
  max-width: 30em;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.15vw, 1.0625rem);
  line-height: 1.55;
}

.agents__stats {
  display: flex;
  gap: clamp(20px, 3vw, 40px);
  margin: 1.6rem 0 0;
}

.agents__stats dt {
  font-family: var(--display);
  font-size: clamp(2.6rem, 4vw, 3.8rem);
  line-height: 1;
}

.agents__stats .is-accent dt {
  color: var(--accent);
}

.agents__stats dd {
  max-width: 12em;
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.8125rem;
  line-height: 1.35;
}

/* The split: a fixed-ratio box; JS draws the ribbons and moves the labels. */
.flowsplit {
  position: relative;
  aspect-ratio: 400 / 340;
  margin: 0;
}

.flowsplit__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.flowsplit__a {
  fill: var(--accent);
}

.flowsplit__b {
  fill: color-mix(in srgb, var(--ink) 26%, transparent);
}

.flowsplit__in {
  position: absolute;
  left: 0;
  margin: 0;
  max-width: 42%;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.3;
  transform: translateY(calc(-100% - 6px));
}

.flowsplit__label {
  position: absolute;
  margin: 0;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  transform: translateY(-50%);
}

.flowsplit__label b {
  display: block;
  font-family: var(--display);
  font-size: clamp(1.8rem, 2.6vw, 2.5rem);
  font-weight: 400;
  line-height: 1;
}

.flowsplit__label--a b {
  color: var(--accent);
}

/* ---------- Hand-off: "call ended" ---------- */

/* Without motion the hand-off isn't needed: Experience follows directly. */
.callend {
  display: none;
}

.callend__stage {
  position: relative;
  display: grid;
  place-items: center;
  padding: 10vh 0 16vh;
}

.callend__page,
.callend__pill {
  display: none;
}

.callend__next {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(5rem, 15vw, 14rem);
  line-height: 0.86;
  text-transform: uppercase;
}

.callend__num {
  margin-bottom: clamp(0.9rem, 2.4vw, 2.2rem); /* clear of the outline */
  color: var(--accent);
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  letter-spacing: 0.04em;
}

/* EXPERIENCE: an outline that fills up from the bottom (JS sets --fill).
   The word is ~4.3em wide: on the narrowest phones it shrinks to fit. */
.callend__word {
  --fill: 100%;
  font-size: min(1em, calc((100vw - 40px) / 4.3));
  color: transparent;
  background-image: linear-gradient(to top, var(--ink) var(--fill), transparent var(--fill));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-stroke: clamp(1.5px, 0.18vw, 3px) var(--ink);
}

.callend__headline {
  margin-top: 1.4rem;
  font-size: clamp(1.6rem, 3.2vw, 3rem);
  line-height: 1;
}

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

.has-motion .callend {
  display: block;
  height: 420svh;
  margin: 0 calc(var(--pad) * -1);
}

.has-motion .callend__stage {
  position: sticky;
  top: 0;
  height: 100svh;
  padding: 0;
  overflow: hidden;
}

/* The page that squeezes into the island. JS scales it toward the pill. */
.has-motion .callend__page {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border: 1.5px solid transparent; /* JS shows it once the squeeze starts */
  background: var(--bg);
  transform-origin: 50% 0;
  will-change: transform;
}

.callend__echo {
  margin: 0;
  padding: 0 var(--pad);
  font-family: var(--display);
  font-size: clamp(3rem, 9vw, 8.5rem);
  line-height: 0.92;
  text-align: center;
  text-transform: uppercase;
}

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

.has-motion .callend__pill {
  position: absolute;
  top: 16px;
  left: 50%;
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 5px 18px 5px 5px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--bg);
  font-size: 0.875rem;
  font-weight: 700;
  white-space: nowrap;
  opacity: 0;
  transform: translateX(-50%);
}

.callend__face {
  display: block;
  width: 36px;
  height: 36px;
  overflow: hidden;
  border-radius: 50%;
  background: color-mix(in srgb, var(--bg) 92%, var(--accent));
}

.callend__face img {
  display: block;
  width: 100%;
  height: 100%;
}

.callend__red {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff3b30;
}

.has-motion .callend__next {
  position: absolute;
  inset: 0;
  justify-content: center;
  opacity: 0;
}

/* The real navbar steps aside while its stand-in hangs up. */
.is-calling .island {
  opacity: 0;
  pointer-events: none;
}

/* ---------- Small screens ---------- */

@media (max-width: 899px) {
  .b-opener__lede {
    max-width: none;
    text-align: left;
  }

  .voice__stage,
  .agents {
    grid-template-columns: minmax(0, 1fr);
  }

  .voice__chips {
    margin-top: 1rem;
  }

  .voice__title {
    font-size: clamp(2rem, 9vw, 2.8rem);
  }

  .agents {
    gap: 40px;
  }

  .flowsplit {
    width: 88%;
  }
}

/* ---------- Advisory: a San Francisco AI startup ---------- */

.adv {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  align-items: center;
  gap: clamp(28px, 5vw, 80px);
  padding: 4vh 0 16vh;
}

.adv__title {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.3rem, 3.9vw, 3.9rem);
  font-weight: 400;
  line-height: 1.04;
  text-transform: uppercase;
  text-wrap: balance;
}

.adv__title span {
  display: inline-block;
  transform-origin: 50% 80%;
}

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

/* A hairline under the headline: it levels out as the words settle. */
.adv__level {
  display: block;
  width: min(100%, 22rem);
  height: 1.5px;
  margin: 1.5rem 0 0;
  background: var(--ink);
  transform-origin: 0 50%;
}

.adv__body {
  max-width: 28em;
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: clamp(0.95rem, 1.15vw, 1.0625rem);
  line-height: 1.55;
}

.adv__spec {
  margin: 0;
  border-top: 1.5px solid var(--ink);
}

.adv__spec div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.adv__spec dt {
  flex: none;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.adv__spec dd {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(1.35rem, 2.1vw, 1.9rem);
  line-height: 1.05;
  text-align: right;
  text-transform: uppercase;
}

.adv__spec div:first-child dd {
  color: var(--accent);
}

@media (max-width: 899px) {
  .adv {
    grid-template-columns: 1fr;
  }
}