/* Interactive walkthrough (how.html) */

.deck-page {
  min-height: 100vh;
  margin: 0;
}

.deck-back {
  text-decoration: none;
}

.deck-nav-note {
  font-family: var(--buzz-font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--buzz-ink-600);
}

.deck {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 56px;
  width: 100%;
  max-width: 1360px;
  margin: 0 auto;
  padding: 8px 48px 72px;
  box-sizing: border-box;
}

.deck-copy {
  flex: 1 1 440px;
  max-width: 560px;
}

.deck-h1 {
  margin: 0 0 24px;
  font-family: var(--buzz-font-display);
  font-weight: 700;
  font-size: clamp(2rem, 2vw + 1.2rem, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--buzz-sand-50);
}

/* Steps */

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

.deck-step {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  width: 100%;
  margin: 0;
  padding: 12px 14px 14px;
  border: none;
  border-radius: 14px;
  background: transparent;
  text-align: left;
  font-family: var(--buzz-font-body);
  color: var(--buzz-ink-600);
  cursor: pointer;
  transition: background 260ms ease, color 260ms ease;
}

.deck-step:hover {
  background: oklch(27% 0.028 258 / 0.5);
  color: var(--buzz-ink-200);
}

.deck-step.is-active {
  background: var(--buzz-night-800);
  color: var(--buzz-sand-50);
}

.deck-step:focus-visible {
  outline: 2px solid var(--buzz-amber-400);
  outline-offset: 2px;
}

.deck-step__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.deck-step__num {
  font-family: var(--buzz-font-mono);
  font-size: 11px;
  color: var(--buzz-ink-600);
  transition: color 260ms ease;
}

.deck-step.is-active .deck-step__num {
  color: var(--buzz-amber-400);
}

.deck-step__title {
  font-size: 16px;
  font-weight: 700;
  color: inherit;
}

.deck-step__body {
  display: block;
  max-height: 0;
  overflow: hidden;
  padding-left: 34px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--buzz-ink-200);
  opacity: 0;
  transition: max-height 380ms cubic-bezier(0.16, 1, 0.3, 1), opacity 300ms ease, margin-top 380ms ease;
}

.deck-step.is-active .deck-step__body {
  max-height: 260px;
  margin-top: 8px;
  opacity: 1;
}

.deck-step__bar {
  display: block;
  height: 0;
  margin: 0 0 0 34px;
  border-radius: 2px;
  background: var(--buzz-night-700);
  opacity: 0;
  transition: opacity 260ms ease, height 260ms ease, margin-top 260ms ease;
}

.deck-step.is-active .deck-step__bar {
  height: 2px;
  margin-top: 14px;
  opacity: 1;
}

.deck-step__bar span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 2px;
  background: var(--buzz-amber-500);
}

.deck-step.is-paused .deck-step__bar span {
  background: var(--buzz-night-700);
}

/* Controls */

.deck-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 24px 0 0;
  padding-left: 14px;
}

.deck-ctl {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 14px;
  border: 1.5px solid var(--buzz-night-700);
  border-radius: 999px;
  background: transparent;
  color: var(--buzz-ink-200);
  font-family: var(--buzz-font-body);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease, border-color 200ms ease;
}

.deck-ctl:hover {
  background: var(--buzz-night-800);
  color: var(--buzz-sand-50);
}

.deck-ctl--play {
  min-width: 92px;
  border-color: var(--buzz-amber-600);
  color: var(--buzz-amber-300);
}

.deck-count {
  margin-left: 6px;
  font-family: var(--buzz-font-mono);
  font-size: 12px;
  color: var(--buzz-night-700);
}

.deck-count b {
  color: var(--buzz-ink-200);
}

/* Stage */

.deck-stage {
  position: relative;
  flex: 1 1 520px;
  align-self: stretch;
  min-height: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.deck-scene {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(14px) scale(0.98);
  pointer-events: none;
  transition: opacity 420ms cubic-bezier(0.16, 1, 0.3, 1), transform 420ms cubic-bezier(0.16, 1, 0.3, 1);
}

.deck-scene.is-active {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.buzz-phone--solo {
  transform: none;
}

.deck-pair {
  display: flex;
  align-items: center;
}

.deck-pair--after {
  gap: 28px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
}

.deck-note {
  align-self: center;
  margin-top: 4px;
  font-family: var(--buzz-font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--buzz-ink-600);
}

/* 01 link card */

.deck-linkcard {
  width: min(100%, 420px);
  padding: 32px;
  border: 1px solid var(--buzz-night-700);
  border-radius: 24px;
  background: var(--buzz-night-800);
  box-shadow: 0 24px 60px oklch(19% 0.014 55 / 0.35);
}

.deck-linkcard__label {
  font-family: var(--buzz-font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--buzz-amber-400);
}

.deck-linkcard__url {
  margin: 14px 0 24px;
  font-family: var(--buzz-font-mono);
  font-size: clamp(1.35rem, 2vw + 0.6rem, 1.9rem);
  color: var(--buzz-sand-50);
  word-break: break-word;
}

.deck-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.deck-chip {
  padding: 7px 12px;
  border: 1px solid var(--buzz-night-700);
  border-radius: 999px;
  font-family: var(--buzz-font-body);
  font-size: 12.5px;
  color: var(--buzz-ink-200);
}

.deck-linkcard__note {
  margin: 24px 0 0;
  font-family: var(--buzz-font-body);
  font-size: 13px;
  line-height: 1.5;
  color: var(--buzz-ink-600);
}

/* 04 and 06 list panel */

.deck-panel {
  width: min(100%, 440px);
  padding: 20px;
  border: 1px solid var(--buzz-night-700);
  border-radius: 20px;
  background: var(--buzz-night-800);
  box-shadow: 0 24px 60px oklch(19% 0.014 55 / 0.35);
}

.deck-panel--tight {
  padding: 16px;
}

.deck-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--buzz-night-700);
  font-family: var(--buzz-font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--buzz-ink-600);
}

.deck-panel__row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid oklch(35% 0.025 258 / 0.4);
  font-family: var(--buzz-font-body);
  transition: opacity 300ms ease;
}

.deck-panel__row:last-of-type {
  border-bottom: none;
}

.deck-panel__row.is-dim {
  opacity: 0.45;
}

.deck-panel__id {
  flex: 0 0 auto;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--buzz-sand-50);
}

.deck-panel__meta {
  flex: 1 1 auto;
  font-size: 12px;
  color: var(--buzz-ink-600);
}

.deck-tag {
  flex: 0 0 auto;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--buzz-night-700);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--buzz-ink-100);
}

.deck-tag--live {
  background: var(--buzz-amber-500);
  color: var(--buzz-ink-950);
}

.deck-tag--hot {
  background: var(--buzz-live-500);
  color: var(--buzz-ink-950);
}

.deck-panel__foot {
  margin: 16px 0 0;
  font-family: var(--buzz-font-body);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--buzz-ink-600);
}

/* 06 wave strip */

.deck-wavewrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  width: min(100%, 460px);
}

.deck-wave {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.deck-wave__step {
  padding: 8px 13px;
  border: 1.5px solid var(--buzz-night-700);
  border-radius: 999px;
  font-family: var(--buzz-font-body);
  font-size: 12px;
  font-weight: 700;
  color: var(--buzz-ink-200);
}

.deck-wave__step.is-on {
  border-color: var(--buzz-amber-600);
  color: var(--buzz-amber-300);
}

.deck-wave__gap {
  font-family: var(--buzz-font-mono);
  font-size: 10.5px;
  color: var(--buzz-night-700);
}

/* 09 contact card */

.deck-card {
  width: min(100%, 280px);
  padding: 22px;
  border: 1px solid var(--buzz-amber-600);
  border-radius: 20px;
  background: var(--buzz-night-800);
  box-shadow: 0 24px 60px oklch(19% 0.014 55 / 0.35);
}

.deck-card__label {
  font-family: var(--buzz-font-body);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--buzz-amber-400);
}

.deck-card__name {
  margin: 12px 0 10px;
  font-family: var(--buzz-font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--buzz-sand-50);
}

.deck-card__meta {
  margin: 0;
  font-family: var(--buzz-font-mono);
  font-size: 11.5px;
  line-height: 1.7;
  color: var(--buzz-ink-200);
  word-break: break-word;
}

.deck-card__note {
  margin: 16px 0 0;
  font-family: var(--buzz-font-body);
  font-size: 12px;
  line-height: 1.5;
  color: var(--buzz-ink-600);
}

/* Responsive */

@media (max-width: 1080px) {
  .deck {
    flex-direction: column-reverse;
    gap: 28px;
    padding: 8px 24px 56px;
  }

  .deck-copy,
  .deck-stage {
    flex: 1 1 auto;
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
  }

  .deck-stage {
    min-height: 500px;
  }
}

@media (max-width: 560px) {
  .deck-nav-note {
    display: none;
  }

  .deck-stage {
    min-height: 420px;
  }

  .deck-scene {
    transform: translateY(14px) scale(0.82);
  }

  .deck-scene.is-active {
    transform: scale(0.82);
  }

  .deck-step__body {
    font-size: 14px;
  }
}