/* Title, messages, buttons, skip links and the closing curtain. */

.interface {
  position: absolute;
  inset: 0;
  z-index: 8;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  transition: var(--slide);
}

/* Scorecard reveal: the interface slides up and away. */
.stage.is-scorecard-revealed .interface {
  transform: translateY(-100%);
}

/* Return to mind tank: the interface jumps below the screen, then slides back in. */
.stage.is-returning .interface {
  transform: translateY(100%);
  transition: none;
}

.stage.is-returning.is-interface-back .interface {
  transform: translateY(0);
  transition: var(--slide);
}

/* ---------- Skip links (testing shortcuts, shown with ?debug) ---------- */

.skip-links {
  position: absolute;
  top: calc(14px + var(--safe-top));
  left: calc(14px + var(--safe-left));
  display: flex;
  gap: 4px;
}

.skip-link {
  padding: 10px;
  font-size: var(--skip-size);
  letter-spacing: var(--wide-tracking);
  color: var(--ink-muted);
  opacity: 0;
  pointer-events: none;
  transition: opacity .4s ease, color .2s;
}

.skip-link:hover {
  color: var(--ink);
}

.stage:is([data-phase="splash"], [data-phase="briefing"], [data-phase="briefed"], [data-phase="intro"]) .skip-intro-link,
.stage:is([data-phase="splash"], [data-phase="briefing"], [data-phase="briefed"], [data-phase="intro"], [data-phase="draw"], [data-phase="confirm"]) .skip-to-pluto-link,
.stage:not([data-phase="load"], [data-phase="outro"], [data-phase="void"]) .skip-to-scorecard-link {
  opacity: .8;
  pointer-events: auto;
}

/* ---------- Title screen ---------- */

.title-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(32px, 7vmin, 64px);
  pointer-events: auto;
  transition: opacity 1.4s ease;
}

.title-screen.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.title {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: var(--title-size);
  font-weight: 700;
  line-height: .95;
  letter-spacing: .06em;
  color: var(--ink);
  text-shadow: 0 0 28px rgba(217, 209, 176, .3);
}

.title-line {
  display: flex;
}

/* Each letter glitches in on the first load. The values are set by JS
   (js/scene.js, setLetterGlitch); letters that haven't started are hidden. */
.title-letter {
  display: inline-block;
  opacity: var(--letter-opacity, 1);
  transform: translateX(var(--letter-shift, 0em));
  clip-path: var(--letter-clip, none);
}

.stage[data-phase="load"] .title-letter {
  opacity: var(--letter-opacity, 0);
}

/* ---------- Buttons ---------- */
/* No fill or border, just a 1px top rule on the row. */

.awaken-button,
.choice-button,
.return-button {
  min-height: var(--button-height);
  padding: 18px 4px 0;
  font-size: var(--button-size);
  letter-spacing: var(--wide-tracking);
  color: var(--ink);
  text-align: center;
  transition: opacity .2s ease;
}

.awaken-button:active,
.choice-button:active,
.return-button:active {
  opacity: .55;
}

.awaken-button {
  align-self: stretch;
  margin-top: -8px;
  font-size: 15px;
  border-top: 1px solid var(--rule);
  transition: opacity 1.2s ease;
}

.stage[data-phase="load"] .awaken-button {
  opacity: 0;
  pointer-events: none;
}

/* ---------- Message area ---------- */

.message-area {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(var(--message-bottom) + var(--safe-bottom) + var(--horizon-lift, 0px));
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--message-gap);
  padding:
    0
    calc(var(--screen-padding) + var(--safe-right) + var(--horizon-inset, 0px))
    0
    calc(var(--screen-padding) + var(--safe-left));
}

.message {
  max-width: 34em;
  font-size: var(--message-size);
  line-height: 1.6;
  letter-spacing: .16em;
  text-align: left;
  text-wrap: pretty;
  white-space: pre-line;
  color: var(--ink);
  opacity: 0;
  transition: opacity .4s ease;
}

.message.is-visible {
  opacity: 1;
}

/* Characters type on one at a time; timing per character is set by js/messages.js. */
.message span {
  opacity: 0;
}

.message.is-revealing span {
  opacity: 1;
  transition: opacity var(--reveal-duration) var(--reveal-easing) var(--reveal-delay);
}

/* ---------- Choice row ---------- */

.choices {
  display: flex;
  align-self: stretch;
  min-height: var(--button-height);
  max-width: calc(34 * var(--message-size));
  border-top: 1px solid var(--rule);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}

.choices.is-visible {
  opacity: 1;
  pointer-events: auto;
  transition: opacity .8s ease 1.1s;
}

/* On narrow screens the rule bleeds to the screen edges. */
@media (max-width: 599.98px) {
  .choices {
    margin-left: calc(-1 * (var(--screen-padding) + var(--safe-left)));
    margin-right: calc(-1 * (var(--screen-padding) + var(--safe-right)));
    padding-left: calc(var(--screen-padding) + var(--safe-left));
    max-width: calc(34 * var(--message-size) + 2 * var(--screen-padding) + var(--safe-left) + var(--safe-right));
  }
}

.choice-group {
  display: flex;
  flex: 1;
}

/* Only the choices for the current phase are present. */
.stage:not([data-phase="briefed"]) .begin-choice,
.stage:not([data-phase="confirm"]) .confirm-choices,
.stage:not([data-phase="query"]) .pluto-choices {
  display: none;
}

.begin-choice .choice-button {
  flex: 1;
}

/* Two-choice rows: Yes | I have erred, Yes | No. */
.paired-choices .choice-button {
  flex: none;
  padding: 18px 28px 0;
}

.paired-choices .choice-button:first-child {
  padding-left: 0;
}

.choice-divider {
  flex: none;
  width: 1px;
  margin-top: 18px;
  background: var(--rule);
}

/* ---------- Closing curtain ---------- */

.curtain {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 20;
  height: 150%;
  pointer-events: none;
  touch-action: none;
  transform: translateY(100%);
  background: linear-gradient(to bottom,
    rgba(0, 0, 0, 0) 0%,
    rgba(0, 0, 0, .12) 8%,
    rgba(0, 0, 0, .35) 16%,
    rgba(0, 0, 0, .65) 24%,
    rgba(0, 0, 0, .88) 30%,
    #000 34%,
    #000 100%);
  transition: transform 26s cubic-bezier(.4, 0, .5, 1);
}

.stage.is-curtain-down .curtain {
  transform: translateY(0);
  pointer-events: auto;
}