:root {
  --ink: #000307;
  --ink-soft: rgba(0, 6, 11, 0.72);
  --jade: #0b6a74;
  --cyan-stone: #2ee6cf;
  --mountain-deep: #001a30;
  --gold: #f5cf3a;
  --cinnabar: #b03a2e;
  --paper: #e9f8f6;
  --mist: rgba(174, 242, 232, 0.66);
  --line: rgba(46, 230, 207, 0.22);
}

* { box-sizing: border-box; }

html,
body,
#app {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background:
    radial-gradient(circle at 74% 34%, rgba(46, 230, 207, 0.14) 0%, transparent 24%),
    radial-gradient(circle at 43% 58%, rgba(245, 207, 58, 0.08) 0%, transparent 18%),
    radial-gradient(circle at 52% 48%, #00111d 0%, #000307 56%, #000 100%);
  color: var(--paper);
  font-family: "STKaiti", "KaiTi", "Songti SC", serif;
}

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

#app::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0,0,0,0.74), transparent 22%, transparent 72%, rgba(0,0,0,0.64)),
    radial-gradient(circle at 58% 18%, rgba(46,230,207,0.18), transparent 32%),
    radial-gradient(circle at 65% 78%, rgba(245,207,58,0.07), transparent 22%),
    repeating-linear-gradient(90deg, rgba(255,255,255,0.018) 0 1px, transparent 1px 5px);
  mix-blend-mode: screen;
  opacity: 0.75;
}

#app::after {
  content: "";
  position: fixed;
  inset: -20%;
  pointer-events: none;
  opacity: 0.16;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.72' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='.52'/%3E%3C/svg%3E");
  animation: grainDrift 14s steps(4) infinite;
}

/* 宣纸层：横向长纤维 + 细噪 + 边角暖晕，全部低透明度，只加"纸感"不改主调 */
#app .paper {
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.5;
  background-image:
    repeating-linear-gradient(0deg, rgba(233, 220, 190, 0.028) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(233, 220, 190, 0.02) 0 1px, transparent 1px 7px),
    radial-gradient(ellipse at 8% 6%, rgba(160, 120, 60, 0.10) 0%, transparent 34%),
    radial-gradient(ellipse at 94% 94%, rgba(160, 120, 60, 0.10) 0%, transparent 34%),
    radial-gradient(ellipse at 90% 8%, rgba(160, 120, 60, 0.06) 0%, transparent 28%),
    radial-gradient(ellipse at 10% 92%, rgba(160, 120, 60, 0.06) 0%, transparent 28%);
}

.hud {
  position: fixed;
  left: clamp(18px, 3vw, 46px);
  top: clamp(18px, 4vh, 54px);
  z-index: 5;
  width: min(360px, calc(100vw - 36px));
  padding: 22px 24px 20px;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(0, 6, 11, 0.86), rgba(0, 26, 48, 0.46));
  box-shadow:
    0 22px 70px rgba(0, 0, 0, 0.56),
    0 0 80px rgba(46, 230, 207, 0.08),
    inset 0 0 44px rgba(46, 230, 207, 0.035);
  backdrop-filter: blur(14px);
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--gold);
  font: 11px/1.4 "Segoe UI", sans-serif;
  letter-spacing: 0.22em;
}

.title-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

h1 {
  margin: 0;
  font-weight: 500;
  font-size: clamp(36px, 4.4vw, 56px);
  line-height: 1.04;
  letter-spacing: 0.08em;
  text-shadow: 0 0 24px rgba(46, 230, 207, 0.24);
}

h1 span {
  color: transparent;
  -webkit-text-stroke: 1px rgba(245, 207, 58, 0.86);
  text-shadow: none;
}

/* 朱砂装饰印章 */
.seal {
  flex: none;
  margin-top: 8px;
  padding: 7px 6px;
  width: 48px;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  word-break: break-all;
  line-height: 1.15;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: #f7ecd8;
  background:
    radial-gradient(circle at 30% 25%, rgba(255, 255, 255, 0.16), transparent 42%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='48' height='48'%3E%3Cfilter id='s'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='48' height='48' filter='url(%23s)' opacity='.18'/%3E%3C/svg%3E"),
    linear-gradient(160deg, #c0473a 0%, #a63328 58%, #8f2a20 100%);
  border-radius: 5px 6px 4px 7px;
  box-shadow:
    inset 0 0 10px rgba(60, 8, 4, 0.72),
    inset 0 0 2px rgba(255, 235, 210, 0.35),
    0 3px 14px rgba(176, 58, 46, 0.4);
  transform: rotate(2.4deg);
}

.verse,
.hint {
  color: rgba(233, 248, 246, 0.72);
  font-size: 14px;
  line-height: 1.8;
}

.verse {
  position: relative;
  margin: 20px 0;
  padding: 14px 18px 14px 20px;
  border-left: 1px solid rgba(245, 207, 58, 0.62);
  background:
    linear-gradient(90deg, rgba(245, 207, 58, 0.075), transparent 68%),
    linear-gradient(180deg, rgba(46, 230, 207, 0.055), rgba(0, 0, 0, 0));
  box-shadow: inset 0 0 28px rgba(46, 230, 207, 0.035);
}

.verse::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 12px;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(245, 207, 58, 0.28);
  opacity: 0.52;
  transform: rotate(45deg);
}

.verse-title {
  margin: 0 0 8px;
  color: var(--gold);
  font-size: 13px;
  line-height: 1;
  letter-spacing: 0.42em;
  text-transform: uppercase;
}

.verse p:not(.verse-title) {
  margin: 0;
  color: rgba(233, 248, 246, 0.82);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.12em;
  text-shadow: 0 0 18px rgba(46, 230, 207, 0.14);
}

.hint { margin: 14px 0 0; font-size: 12px; }

.actions {
  display: grid;
  grid-template-columns: 1fr 0.72fr;
  gap: 10px;
  margin-top: 20px;
}

button {
  min-height: 38px;
  border: 1px solid rgba(245, 207, 58, 0.72);
  background: rgba(245, 207, 58, 0.08);
  color: var(--gold);
  cursor: pointer;
  font: 12px/1 "Segoe UI", sans-serif;
  letter-spacing: 0.12em;
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

button:hover {
  transform: translateY(-1px);
  background: rgba(245, 207, 58, 0.16);
  box-shadow: 0 0 24px rgba(245, 207, 58, 0.22);
}

button.ghost {
  border-color: rgba(46, 230, 207, 0.46);
  color: var(--cyan-stone);
  background: rgba(46, 230, 207, 0.06);
}

/* 落款（署名 + 联系方式） */
.colophon {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(245, 207, 58, 0.28);
}

.colophon-name {
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(233, 248, 246, 0.78);
  font-size: 13px;
  letter-spacing: 0.14em;
}

.seal-dot {
  flex: none;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: #f7ecd8;
  background: linear-gradient(160deg, #c0473a, #8f2a20);
  border-radius: 3px;
  box-shadow: inset 0 0 4px rgba(60, 8, 4, 0.7);
  transform: rotate(-3deg);
}

.colophon-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
}

.colophon-links li a {
  color: rgba(245, 207, 58, 0.72);
  text-decoration: none;
  font: 11px/1.8 "Segoe UI", sans-serif;
  letter-spacing: 0.06em;
  border-bottom: 1px dotted rgba(245, 207, 58, 0.4);
  transition: color 180ms ease, border-color 180ms ease;
}

.colophon-links li a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

/* 手势控制 */
.music-btn {
  width: 100%;
  margin-top: 10px;
}

.gesture-btn {
  width: 100%;
  margin-top: 8px;
  border-color: rgba(46, 230, 207, 0.46);
  color: var(--cyan-stone);
  background: rgba(46, 230, 207, 0.06);
}

.gesture-btn:hover {
  background: rgba(46, 230, 207, 0.14);
  box-shadow: 0 0 24px rgba(46, 230, 207, 0.22);
}

.gesture-status {
  margin: 8px 0 0;
  min-height: 16px;
  color: rgba(233, 248, 246, 0.66);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.05em;
}

.gesture-preview {
  position: fixed;
  right: clamp(18px, 3vw, 42px);
  bottom: clamp(18px, 4vh, 42px);
  z-index: 6;
  width: 176px;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  background: rgba(0, 6, 11, 0.9);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.55);
}

.gesture-preview video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* 仅镜像视频：符合照镜子直觉 */
}

/* 关键点画布不镜像：selfieMode 已把坐标翻转到镜像视角，再翻就错位 */
.gesture-preview canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.poem {
  position: fixed;
  right: clamp(18px, 3vw, 42px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 4;
  display: grid;
  gap: 18px;
  color: rgba(233, 248, 246, 0.56);
  writing-mode: vertical-rl;
  letter-spacing: 0.34em;
  font-size: 15px;
  text-shadow: 0 0 20px rgba(46, 230, 207, 0.2);
}

.poem span {
  padding: 14px 7px;
  border-right: 1px solid rgba(245, 207, 58, 0.22);
}

.loading {
  position: fixed;
  left: 50%;
  bottom: 42px;
  z-index: 8;
  transform: translateX(-50%);
  color: var(--gold);
  font-size: 13px;
  letter-spacing: 0.3em;
  transition: opacity 700ms ease, transform 700ms ease;
}

.loading.is-hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(10px);
  pointer-events: none;
}

@keyframes grainDrift {
  0%, 100% { transform: translate3d(0, 0, 0); }
  25% { transform: translate3d(-2%, 1%, 0); }
  50% { transform: translate3d(1%, -2%, 0); }
  75% { transform: translate3d(2%, 2%, 0); }
}

@media (max-width: 760px) {
  .hud {
    top: 14px;
    padding: 16px 18px;
  }

  .verse { margin: 14px 0; }

  .poem { display: none; }

  .actions {
    grid-template-columns: 1fr;
  }

  .gesture-preview {
    width: 128px;
  }
}