:root {
  --bg:    #0a0a0b;
  --fg:    #f3efe7;
  --dim:   #7a756d;
  --line:  #1f1d1a;
  --gold:  #d9b063;
  --warm:  #ffb56b;
  --red:   #b13a3a;
  --font:  "Inter", "Helvetica Neue", Arial, sans-serif;
  --serif: "Cormorant Garamond", "Times New Roman", serif;
  --ease:  cubic-bezier(0.65, 0, 0.35, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  height: 100%;
  width: 100%;
}
a { color: inherit; text-decoration: none; }
button { background: none; border: 0; color: inherit; cursor: pointer; font: inherit; }
ul { list-style: none; }

/* ---------- Loader ---------- */
.loader {
  position: fixed; inset: 0; z-index: 100;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.9s var(--ease), visibility 0.9s var(--ease);
}
.loader.is-done { opacity: 0; visibility: hidden; pointer-events: none; }
.loader__wrap { position: relative; width: min(560px, 60vw); text-align: center; }
.loader__hint,
.loader__enter {
  display: inline-block;
  font-style: normal;
  font-size: 16px;
  letter-spacing: 0.35em;
  color: var(--fg);
  padding: 0 18px;
  background: var(--bg);
  position: relative;
  z-index: 2;
  transition: opacity 0.5s var(--ease), letter-spacing 0.4s var(--ease);
}
.loader__enter { opacity: 0; visibility: hidden; pointer-events: none; color: var(--gold); }
.loader.is-ready .loader__hint  { opacity: 0; visibility: hidden; pointer-events: none; }
.loader.is-ready .loader__enter { opacity: 1; visibility: visible; pointer-events: auto; }
.loader.is-ready .loader__enter:hover { letter-spacing: 0.65em; }
.loader__bar {
  position: absolute; left: 50%; top: 50%;
  height: 1px; width: 0;
  background: var(--gold);
  transform: translate(-50%, -50%);
  z-index: 1;
  transition: width 0.4s linear;
}

/* ---------- Stage ---------- */
.stage {
  position: fixed; inset: 0;
  z-index: 1;
  opacity: 0;
  transition: opacity 1.4s var(--ease);
}
.stage.is-on { opacity: 1; }
#scene { display: block; width: 100%; height: 100%; }

/* ---------- Header / Footer ---------- */
.header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 22px 36px;
  mix-blend-mode: difference;
  pointer-events: none;
}
.header__inner { display: flex; justify-content: space-between; align-items: center; }
.header__brand {
  font-family: var(--serif);
  font-size: 24px;
  font-style: italic;
  letter-spacing: 0.04em;
  font-weight: 400;
  pointer-events: auto;
}
.header__date {
  font-size: 14px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
}

.footer {
  position: fixed; bottom: 0; left: 0; right: 0;
  z-index: 50;
  padding: 22px 36px;
  mix-blend-mode: difference;
  pointer-events: none;
}
.footer__inner { display: flex; justify-content: space-between; align-items: center; }
.footer__credit {
  font-size: 13px;
  letter-spacing: 0.35em;
  color: var(--dim);
}
.footer__audio {
  width: 36px; height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
  pointer-events: auto;
}
.footer__audio:hover { border-color: var(--gold); color: var(--gold); }
.footer__audio[aria-pressed="true"] { border-color: var(--gold); color: var(--gold); }

/* ---------- Stage indicator (left dots) ---------- */
.stages {
  position: fixed;
  left: 36px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 14px;
  opacity: 0;
  transition: opacity 1s var(--ease);
}
.stage.is-on ~ .stages { opacity: 1; }

.stages__dot {
  width: 22px; height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
}
.stages__dot::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--dim);
  transition: all 0.4s var(--ease);
}
.stages__dot.is-passed::before { background: var(--gold); opacity: 0.5; }
.stages__dot.is-active::before {
  width: 9px; height: 9px;
  background: var(--gold);
  box-shadow: 0 0 12px rgba(217, 176, 99, 0.6);
}
.stages__dot::after {
  content: attr(data-label);
  position: absolute;
  left: 30px;
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.3s var(--ease);
  white-space: nowrap;
  pointer-events: none;
}
.stages__dot:hover::after,
.stages__dot.is-active::after { opacity: 1; transform: translateX(0); }

/* ---------- Bottom caption (current stage title) ---------- */
.caption {
  position: fixed;
  left: 50%; bottom: 28px;
  transform: translateX(-50%);
  z-index: 40;
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.7s var(--ease);
  max-width: 90vw;
}
.stage.is-on ~ .caption { opacity: 1; }
.caption__index {
  font-family: var(--serif);
  font-size: 18px;
  font-style: italic;
  color: var(--gold);
  letter-spacing: 0.2em;
  display: block;
  margin-bottom: 10px;
}
.caption__title {
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: 0.04em;
}
.caption__desc {
  margin-top: 12px;
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--dim);
}
.caption.is-swap .caption__title,
.caption.is-swap .caption__index,
.caption.is-swap .caption__desc { animation: capSwap 0.6s var(--ease) both; }
.caption.is-swap .caption__title { animation-delay: 0.05s; }
.caption.is-swap .caption__desc  { animation-delay: 0.10s; }
@keyframes capSwap {
  0%   { opacity: 0; transform: translateY(10px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ---------- Scroll hint (bottom right) ---------- */
.hint {
  position: fixed;
  right: 36px;
  bottom: 86px;
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  opacity: 0;
  transition: opacity 0.7s var(--ease);
  pointer-events: none;
}
.stage.is-on ~ .hint { opacity: 0.8; }
.hint__keys {
  font-size: 13px;
  letter-spacing: 0.25em;
  color: var(--dim);
}
.hint__arrow {
  font-size: 22px;
  color: var(--gold);
  animation: hintBob 1.6s var(--ease) infinite;
}
.hint.is-end .hint__arrow { display: none; }
@keyframes hintBob {
  0%,100% { transform: translateY(0); opacity: 0.5; }
  50%     { transform: translateY(6px); opacity: 1; }
}

/* ---------- Blow overlay (last stage) ---------- */
.blow {
  position: fixed;
  left: 50%; bottom: 140px;
  transform: translateX(-50%);
  z-index: 45;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.6s var(--ease), visibility 0.6s var(--ease);
  pointer-events: none;
}
.blow.is-show { opacity: 1; visibility: visible; }
.blow__ring { width: 88px; height: 88px; }
.blow__ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.blow__track,
.blow__fill {
  fill: none;
  stroke-width: 1.5;
  cx: 50; cy: 50; r: 46;
}
.blow__track { stroke: rgba(255,255,255,0.10); }
.blow__fill {
  stroke: var(--gold);
  stroke-dasharray: 289;
  stroke-dashoffset: 289;
  transition: stroke-dashoffset 0.05s linear;
}
.blow__hint {
  font-size: 16px;
  letter-spacing: 0.3em;
  color: var(--gold);
}

/* ---------- Finale ---------- */
.finale {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 22px;
  text-align: center;
  background: radial-gradient(ellipse at center, rgba(10,10,11,0.55) 0%, rgba(10,10,11,0.9) 70%);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 1.2s var(--ease), visibility 1.2s var(--ease);
}
.finale.is-show { opacity: 1; visibility: visible; pointer-events: auto; }
.finale__kicker {
  font-family: var(--serif);
  font-style: italic;
  font-size: 20px;
  color: var(--gold);
  letter-spacing: 0.25em;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.8s var(--ease) 0.2s;
}
.finale__title {
  font-family: var(--serif);
  font-size: clamp(60px, 11vw, 180px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
}
.finale__title span { display: block; opacity: 0; transform: translateY(14px); transition: all 0.9s var(--ease); }
.finale__title span:nth-child(1) { transition-delay: 0.35s; }
.finale__title span:nth-child(2) { transition-delay: 0.55s; }
.finale__title .is-gold { color: var(--gold); font-style: italic; }

/* 李超生日快乐 — 6-character banner as the hero of the finale */
.finale__title--name {
  font-size: clamp(44px, 9vw, 128px);
  letter-spacing: 0.08em;
  color: var(--gold);
  line-height: 1.1;
  white-space: nowrap;
}
.finale__title--name span { transition-delay: 0.35s; display: block; }
.finale__name {
  font-size: 18px;
  letter-spacing: 0.35em;
  color: var(--dim);
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.8s var(--ease) 0.75s;
}
.finale__name .is-name { color: var(--fg); }
.finale__replay {
  margin-top: 16px;
  font-size: 15px;
  letter-spacing: 0.3em;
  color: var(--gold);
  border: 1px solid var(--line);
  padding: 14px 28px;
  border-radius: 28px;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.8s var(--ease) 0.95s, border-color 0.3s var(--ease);
}
.finale__replay:hover { border-color: var(--gold); }
.finale.is-show .finale__kicker,
.finale.is-show .finale__title span,
.finale.is-show .finale__name,
.finale.is-show .finale__replay {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .header  { padding: 18px 20px; }
  .footer  { padding: 18px 20px; }
  .stages  { left: 18px; }
  .hint    { right: 18px; bottom: 80px; }
  .caption { bottom: 80px; }
}