@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@200;300&family=Noto+Sans+JP:wght@100;200&display=swap');

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --white:        #f0ede8;
  --white-dim:    rgba(240, 237, 232, 0.55);
  --white-faint:  rgba(240, 237, 232, 0.25);
  --black:        #000000;
  --hud-font:     'Noto Sans JP', sans-serif;
  --title-font:   'Noto Serif JP', serif;
}

html, body {
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
  color: var(--white);
  -webkit-font-smoothing: antialiased;
}

/* ─── Canvas ─────────────────────────────────────────── */
#scene-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  opacity: 0;
  transition: opacity 2.4s ease;
}

#scene-canvas.visible {
  opacity: 1;
}

/* ─── Welcome Screen ──────────────────────────────────── */
#welcome-screen {
  position: fixed;
  inset: 0;
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  z-index: 100;
  opacity: 1;
  transition: opacity 1.8s ease;
  pointer-events: all;
}

#welcome-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.welcome-ja {
  font-family: var(--title-font);
  font-weight: 200;
  font-size: clamp(1.4rem, 4vw, 2.6rem);
  letter-spacing: 0.25em;
  color: var(--white);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 2s ease, transform 2s ease;
  margin-bottom: 0.55rem;
}

.welcome-en {
  font-family: var(--hud-font);
  font-weight: 100;
  font-size: clamp(0.6rem, 1.4vw, 0.85rem);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--white-dim);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 2s ease 0.6s, transform 2s ease 0.6s;
}

.welcome-divider {
  width: 1px;
  height: 0;
  background: var(--white-faint);
  margin: 2.2rem 0;
  transition: height 1.6s ease 1.2s;
}

.welcome-enter {
  font-family: var(--hud-font);
  font-weight: 100;
  font-size: clamp(0.55rem, 1.2vw, 0.72rem);
  letter-spacing: 0.5em;
  color: var(--white-faint);
  opacity: 0;
  transition: opacity 1.8s ease 2.2s;
  cursor: pointer;
  user-select: none;
}

/* revealed states */
.welcome-ja.show      { opacity: 1; transform: translateY(0); }
.welcome-en.show      { opacity: 1; transform: translateY(0); }
.welcome-divider.show { height: 48px; }
.welcome-enter.show   { opacity: 1; }

/* ─── HUD ─────────────────────────────────────────────── */
#hud {
  position: fixed;
  top: 0;
  right: 0;
  padding: 1.5rem 1.8rem;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.3rem;
  opacity: 0;
  transition: opacity 1.2s ease;
  pointer-events: none;
}

#hud.visible {
  opacity: 1;
}

#hud-time {
  font-family: var(--hud-font);
  font-weight: 100;
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  letter-spacing: 0.12em;
  color: var(--white);
}

#hud-period {
  font-family: var(--title-font);
  font-weight: 200;
  font-size: clamp(0.6rem, 1.2vw, 0.72rem);
  letter-spacing: 0.3em;
  color: var(--white-dim);
}

#hud-weather {
  font-family: var(--hud-font);
  font-weight: 100;
  font-size: clamp(0.55rem, 1vw, 0.65rem);
  letter-spacing: 0.28em;
  color: var(--white-faint);
  margin-top: 0.15rem;
}

/* ─── Mobile controls hint ───────────────────────────── */
#mobile-hint {
  position: fixed;
  bottom: 1.8rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--hud-font);
  font-weight: 100;
  font-size: 0.6rem;
  letter-spacing: 0.35em;
  color: var(--white-faint);
  opacity: 0;
  transition: opacity 1.5s ease;
  pointer-events: none;
  white-space: nowrap;
  z-index: 50;
}

#mobile-hint.visible {
  opacity: 1;
}

/* only show on touch devices */
@media (hover: hover) {
  #mobile-hint { display: none; }
}

/* ─── Crosshair (desktop) ────────────────────────────── */
#crosshair {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  opacity: 0;
  transition: opacity 0.4s ease;
  pointer-events: none;
  z-index: 50;
}

#crosshair::before,
#crosshair::after {
  content: '';
  position: absolute;
  background: var(--white-faint);
}

#crosshair::before {
  width: 1px;
  height: 100%;
  left: 50%;
  top: 0;
}

#crosshair::after {
  width: 100%;
  height: 1px;
  top: 50%;
  left: 0;
}

#crosshair.visible {
  opacity: 1;
}

/* ─── Train arrival banner ───────────────────────────── */
#train-banner {
  position: fixed;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  opacity: 0;
  transition: opacity 0.8s ease;
  pointer-events: none;
  z-index: 50;
}

#train-banner.visible {
  opacity: 1;
}

#train-banner-ja {
  font-family: var(--title-font);
  font-weight: 200;
  font-size: clamp(0.7rem, 1.5vw, 0.9rem);
  letter-spacing: 0.2em;
  color: var(--white-dim);
}

#train-banner-en {
  font-family: var(--hud-font);
  font-weight: 100;
  font-size: clamp(0.5rem, 1vw, 0.6rem);
  letter-spacing: 0.35em;
  color: var(--white-faint);
}