:root {
  --night: #070b14;
  --paper: #f2ede3;
  --text: #e8e2d6;
  --silver: #8b9bb4;
  --gold: #c4a574;
  --ink: #1a1a1a;
  --font-display: "Noto Serif SC", "Songti SC", "STSong", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--night);
  color: var(--text);
  font-family: var(--font-body);
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

#fx {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
  cursor: crosshair;
  touch-action: manipulation;
}

.stage {
  position: relative;
  z-index: 1;
  height: 100dvh;
  width: min(560px, 100%);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  text-align: center;
  gap: 0.65rem;
  pointer-events: none;
}

.stage button,
.stage .slip,
.letter {
  pointer-events: auto;
}

.top {
  position: absolute;
  top: 1.4rem;
  left: 0;
  right: 0;
  pointer-events: none;
}

.eyebrow {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.36em;
  text-indent: 0.36em;
  color: var(--silver);
}

.name {
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.8rem, 7vw, 2.4rem);
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  color: var(--paper);
  text-shadow: 0 0 30px rgba(242, 237, 227, 0.25);
}

.moon {
  position: absolute;
  top: 18%;
  left: 50%;
  transform: translateX(-50%);
  width: min(42vw, 150px);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  background: var(--paper);
  box-shadow:
    0 0 0 1px rgba(242, 237, 227, 0.2),
    0 0 50px rgba(242, 237, 227, 0.18),
    0 0 100px rgba(196, 165, 116, 0.08);
  pointer-events: none;
  animation: floaty 5s ease-in-out infinite;
}

@keyframes floaty {
  0%,
  100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(-6px);
  }
}

.avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 18%;
  display: block;
}

.who {
  margin: 0;
  position: absolute;
  top: calc(18% + min(42vw, 150px) + 0.55rem);
  left: 0;
  right: 0;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.45em;
  text-indent: 0.45em;
  color: var(--gold);
  pointer-events: none;
}

.hint {
  margin: 0 0 0.15rem;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: rgba(139, 155, 180, 0.75);
  pointer-events: none;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: center;
  max-width: 22rem;
}

.btn {
  appearance: none;
  border: 1px solid rgba(242, 237, 227, 0.22);
  background: rgba(10, 15, 24, 0.45);
  backdrop-filter: blur(8px);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  padding: 0.8rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
  min-height: 44px;
  transition: transform 0.15s ease, background 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.btn:hover {
  background: rgba(242, 237, 227, 0.08);
  border-color: rgba(242, 237, 227, 0.4);
}

.btn:active {
  transform: scale(0.96);
}

.btn:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: 3px;
}

.btn-gold {
  border-color: rgba(196, 165, 116, 0.65);
  background: rgba(196, 165, 116, 0.14);
  color: #f3e7d0;
  box-shadow: 0 0 24px rgba(196, 165, 116, 0.12);
}

.btn-gold:hover {
  background: rgba(196, 165, 116, 0.22);
}

.ghost {
  border-color: rgba(139, 155, 180, 0.25);
  background: rgba(7, 11, 20, 0.35);
  font-size: 0.8rem;
}

.slip {
  width: min(18rem, 100%);
  padding: 0.95rem 1.1rem 1.05rem;
  border-top: 1px solid rgba(196, 165, 116, 0.4);
  border-bottom: 1px solid rgba(196, 165, 116, 0.4);
  background: rgba(7, 11, 20, 0.4);
  backdrop-filter: blur(6px);
  animation: pop 0.4s ease both;
}

@keyframes pop {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.slip-label {
  margin: 0 0 0.35rem;
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--gold);
}

.slip-text {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.16em;
  color: var(--paper);
}

.foot {
  margin: 0.2rem 0 0;
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  color: rgba(139, 155, 180, 0.4);
  pointer-events: none;
}

/* letter overlay */
.letter {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: rgba(7, 11, 20, 0.55);
  backdrop-filter: blur(4px);
  animation: pop 0.35s ease both;
}

.letter-paper {
  position: relative;
  width: min(22rem, 100%);
  text-align: left;
  padding: 1.6rem 1.35rem 1.5rem;
  background: var(--paper);
  color: var(--ink);
  border-radius: 2px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  font-family: var(--font-display);
  line-height: 2;
  user-select: text;
}

.letter-paper p {
  margin: 0 0 0.4rem;
  font-size: 0.95rem;
}

.letter-salute {
  letter-spacing: 0.18em;
  margin-bottom: 0.65rem !important;
}

.letter-hl {
  color: #8a5a1e;
  font-size: 1.15rem !important;
  letter-spacing: 0.12em;
}

.letter-sign {
  margin-top: 0.9rem !important;
  text-align: right;
  color: #5c4a2f;
  letter-spacing: 0.18em;
}

.close {
  position: absolute;
  top: 0.45rem;
  right: 0.55rem;
  border: 0;
  background: transparent;
  color: #666;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  width: 36px;
  height: 36px;
}

@media (min-width: 480px) {
  .moon {
    width: 160px;
    top: 20%;
  }

  .who {
    top: calc(20% + 160px + 0.55rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .moon,
  .slip,
  .letter {
    animation: none !important;
  }
}