/* Layout: full-bleed canvas stage; title and answer cards anchored
   bottom-left, the play control beside them, HUD-style meta row on top. */
:root {
  --ink: #05060a;
  --paper: #f2f4fa;
  --dim: #8d94ad;
  --line: rgba(242, 244, 250, 0.18);
  --signal: #ff3b4d;
  --day-1: #f2f4fa;
  --day-2: #f2f4fa;
  --day-bg: #05060a;

  --f-ja: "Dela Gothic One", "Hiragino Kaku Gothic StdN", "Yu Gothic", "Noto Sans JP", sans-serif;
  --f-en: "Anton", Impact, "Arial Narrow Bold", sans-serif;
  --f-mono: "Martian Mono", ui-monospace, Menlo, Consolas, "Hiragino Sans", "Noto Sans JP", monospace;

  --gutter: max(20px, 4vw);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

body { font: 14px/1.6 var(--f-mono); }

#stage, #stage canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

/* ---------------------------------------------------------------- overlay */
.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 24px;
  padding:
    max(var(--gutter), env(safe-area-inset-top, 0px))
    max(var(--gutter), env(safe-area-inset-right, 0px))
    max(var(--gutter), env(safe-area-inset-bottom, 0px))
    max(var(--gutter), env(safe-area-inset-left, 0px));
  background:
    linear-gradient(to top right, rgba(5, 6, 10, 0.92) 0%, rgba(5, 6, 10, 0.55) 45%, rgba(5, 6, 10, 0) 75%);
  transition: opacity 0.5s ease, visibility 0s linear 0s;
  overflow-y: auto;
}

.overlay.is-off {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.35s ease, visibility 0s linear 0.35s;
}

.meta {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--dim);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.title-block, .answer {
  align-self: end;
  display: grid;
  gap: 12px;
  min-width: 0;
}

.kicker {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.4em;
  color: var(--signal);
}

.title {
  margin: 0;
  font: 400 clamp(64px, 14vw, 210px)/0.98 var(--f-ja);
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.title span { display: block; }
.title em { font-style: normal; color: var(--signal); }

.en {
  margin: 0;
  font-size: clamp(12px, 1.3vw, 16px);
  font-weight: 500;
  letter-spacing: 0.35em;
  color: var(--dim);
}

/* ---------------------------------------------------------------- action */
.action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 28px;
}

.play {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 10px 26px 10px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(242, 244, 250, 0.04);
  color: var(--paper);
  font: inherit;
  cursor: pointer;
  text-align: left;
  transition: transform 0.25s cubic-bezier(.2, .9, .3, 1.3), background 0.2s ease, border-color 0.2s ease;
}
.play:hover:not(:disabled) {
  transform: scale(1.04);
  background: rgba(242, 244, 250, 0.09);
  border-color: rgba(242, 244, 250, 0.4);
}
.play:focus-visible, .controls button:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 4px;
}
.play:disabled { cursor: progress; opacity: 0.55; }

.play-icon {
  position: relative;
  flex: none;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 0 rgba(255, 59, 77, 0.5);
  animation: pulse 1.875s ease-out infinite;
}
.play-icon::after {
  content: "";
  position: absolute;
  left: 26px;
  top: 21px;
  border-style: solid;
  border-width: 11px 0 11px 18px;
  border-color: transparent transparent transparent var(--paper);
}
.play:disabled .play-icon { animation: none; background: var(--dim); }

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 59, 77, 0.55); }
  70% { box-shadow: 0 0 0 22px rgba(255, 59, 77, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 59, 77, 0); }
}

.play-label { display: grid; gap: 2px; }
.play-label b {
  font: 400 18px/1.3 var(--f-ja);
  letter-spacing: 0.04em;
}
.play-label small {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.25em;
  color: var(--dim);
}

.hint {
  margin: 0;
  font-size: 12px;
  color: var(--dim);
  letter-spacing: 0.04em;
}
.hint kbd {
  font: 700 11px var(--f-mono);
  padding: 1px 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--paper);
}
.override { color: var(--signal); }

/* --------------------------------------------------------------- controls */
.controls {
  position: fixed;
  top: calc(env(safe-area-inset-top, 0px) + 14px);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.controls.is-awake { opacity: 1; }
.controls.is-off { display: none; }
.controls:focus-within { opacity: 1; }
.controls button {
  font: 500 10px var(--f-mono);
  letter-spacing: 0.2em;
  padding: 8px 12px;
  color: var(--paper);
  background: rgba(5, 6, 10, 0.6);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
}
.controls button:hover { border-color: rgba(242, 244, 250, 0.5); }
.controls button[aria-pressed="true"] { color: var(--signal); border-color: var(--signal); }

/* ----------------------------------------------------------------- answer */
#outro {
  background:
    linear-gradient(to right, color-mix(in srgb, var(--day-bg) 92%, transparent) 0%, color-mix(in srgb, var(--day-bg) 50%, transparent) 50%, transparent 80%);
}
#outro .kicker { color: var(--day-1); }
#outro .meta { border-color: color-mix(in srgb, var(--day-1) 35%, transparent); }

.answer-ja {
  margin: 0;
  font: 400 clamp(72px, 16vw, 230px)/1 var(--f-ja);
  letter-spacing: -0.02em;
  background: linear-gradient(100deg, var(--day-1), var(--day-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.answer-en {
  margin: 0;
  font: 400 clamp(36px, 6vw, 84px)/1 var(--f-en);
  letter-spacing: 0.04em;
}
.answer-meta {
  margin: 0;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--day-2);
}
.answer-msg {
  margin: 0;
  max-width: 34em;
  font: 400 clamp(15px, 1.6vw, 20px)/1.6 var(--f-ja);
}
#outro .play-icon { background: var(--day-1); animation: none; }
#outro .play:focus-visible { outline-color: var(--day-1); }
#outro .play-icon::after { border-left-color: var(--day-bg); }

@media (max-width: 640px) {
  .overlay { gap: 18px; }
  .title { font-size: clamp(64px, 19vw, 140px); }
  .answer-ja { font-size: clamp(72px, 21vw, 150px); }
  .play-icon { width: 56px; height: 56px; }
  .play-icon::after { left: 22px; top: 18px; border-width: 10px 0 10px 16px; }
  .play-label b { font-size: 16px; }
  #outro {
    background: linear-gradient(to top, color-mix(in srgb, var(--day-bg) 95%, transparent) 0%, color-mix(in srgb, var(--day-bg) 70%, transparent) 55%, transparent 85%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .play-icon { animation: none; }
  .overlay, .overlay.is-off, .play, .controls { transition: none; }
}