.intro {
  position: absolute;
  inset: 0;
  z-index: 4;
}

.intro.is-done {
  display: none;
}

/* ========== 茶杯 ========== */
.cup {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 440px;
  height: 572px;
  margin: -286px 0 0 -220px;
  opacity: 0;
  filter: blur(14px);
  transform: scale(0.94);
  transition:
    opacity 1.8s ease,
    filter 1.8s ease,
    transform 1.8s var(--ease-out);
}

.cup.is-visible {
  opacity: 1;
  filter: blur(0);
  transform: scale(1);
}

.cup__floor {
  position: absolute;
  left: 50%;
  bottom: -18px;
  width: 420px;
  height: 60px;
  margin-left: -210px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(216, 180, 106, 0.2), transparent 70%);
  filter: blur(4px);
}

.cup__float {
  position: absolute;
  inset: 0;
}

.cup__float.is-floating {
  animation: cup-float 4.6s ease-in-out infinite;
}

.cup__glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 780px;
  height: 780px;
  margin: -390px 0 0 -390px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(216, 180, 106, 0.2) 0%, rgba(80, 150, 115, 0.08) 38%, transparent 66%);
  pointer-events: none;
  animation: glow-breathe 4.6s ease-in-out infinite;
}

.cup__vessel {
  position: absolute;
  inset: 0;
  transform-origin: 50% 92%;
}

.cup__body,
.cup__lid {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.cup__lid {
  transform-origin: 50% 34%;
  filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.35));
}

/* 杯口迸出的光 */
.cup__burst {
  position: absolute;
  top: 40%;
  left: 50%;
  width: 320px;
  height: 140px;
  margin: -70px 0 0 -160px;
  border-radius: 50%;
  background: radial-gradient(ellipse, rgba(255, 244, 210, 0.95) 0%, rgba(240, 190, 100, 0.55) 35%, transparent 70%);
  filter: blur(6px);
  mix-blend-mode: screen;
  opacity: 0;
}

.cup__beam {
  position: absolute;
  left: 50%;
  bottom: 60%;
  width: 240px;
  height: 460px;
  margin-left: -120px;
  background: linear-gradient(to top, rgba(255, 228, 170, 0.5), rgba(255, 228, 170, 0.12) 55%, transparent);
  filter: blur(22px);
  mix-blend-mode: screen;
  transform-origin: 50% 100%;
  opacity: 0;
}

/* ========== 飘出的文字与蒸汽 ========== */
.intro__words {
  position: absolute;
  top: 480px;
  left: 960px;
  width: 0;
  height: 0;
  pointer-events: none;
}

.word {
  position: absolute;
  top: 0;
  left: 0;
  width: 120px;
  margin: -40px 0 0 -60px;
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 80px;
  text-align: center;
  color: var(--c-gold-light);
  text-shadow: 0 0 18px rgba(243, 217, 160, 0.85), 0 0 46px rgba(216, 180, 106, 0.5);
  opacity: 0;
  will-change: transform, opacity, filter;
}

.wisp {
  position: absolute;
  top: -220px;
  left: -50px;
  width: 100px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(ellipse at 50% 70%, rgba(255, 246, 228, 0.38), transparent 66%);
  filter: blur(14px);
  opacity: 0;
}

/* ========== 打字机文案 ========== */
.typewriter {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 30px;
  pointer-events: none;
}

.letter {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.letter__line {
  font-family: var(--font-serif);
  white-space: pre;
}

.letter__title {
  margin-bottom: 56px;
  font-size: 56px;
  letter-spacing: 0.16em;
  color: #f4ead2;
  text-shadow: 0 0 32px rgba(216, 180, 106, 0.35);
}

.letter__body {
  font-size: 28px;
  line-height: 50px;
  letter-spacing: 0.12em;
  color: #d6e0d9;
}

.letter__gap {
  height: 26px;
}

.letter__signature {
  align-self: flex-end;
  margin-top: 44px;
  font-size: 26px;
  letter-spacing: 0.12em;
  color: var(--c-gold-light);
}

.typewriter__char {
  display: inline-block;
  opacity: 0;
}

.typewriter__cursor {
  display: inline-block;
  width: 3px;
  height: 0.95em;
  margin-left: 6px;
  margin-right: -9px;
  background: var(--c-gold);
  box-shadow: 0 0 12px var(--c-gold);
  vertical-align: -0.1em;
  animation: cursor-blink 1s steps(1) infinite;
}

/* ========== 点击提示 ========== */
.intro__hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 96px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 1s ease, transform 1s var(--ease-out);
  pointer-events: none;
}

.intro__hint.is-visible {
  opacity: 1;
  transform: none;
}

.intro__hint p {
  font-family: var(--font-serif);
  font-size: 22px;
  letter-spacing: 10px;
  color: rgba(243, 217, 160, 0.75);
  animation: hint-breathe 2.6s ease-in-out infinite;
}

.tap {
  position: relative;
  width: 56px;
  height: 56px;
}

.tap__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 14px;
  height: 14px;
  margin: -7px 0 0 -7px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 16px var(--c-gold);
}

.tap__ring {
  position: absolute;
  inset: 0;
  border: 1.5px solid rgba(216, 180, 106, 0.8);
  border-radius: 50%;
  animation: tap-ring 2.2s ease-out infinite;
}

.tap__ring:nth-child(2) {
  animation-delay: 1.1s;
}

@keyframes cup-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-14px); }
}

@keyframes glow-breathe {
  0%, 100% { opacity: 0.7; transform: scale(0.96); }
  50% { opacity: 1; transform: scale(1.04); }
}

@keyframes cursor-blink {
  50% { opacity: 0; }
}

@keyframes hint-breathe {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 1; }
}

@keyframes tap-ring {
  0% { transform: scale(0.3); opacity: 1; }
  100% { transform: scale(1.6); opacity: 0; }
}