/* ============================================================
   INNER FOREST · GESTURE STUDY
   情绪森林 · 交互手势作品
   ============================================================ */

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #d9ead3;            /* 浅绿底色 */
  color: #2f3d2c;
  font-family: Georgia, "Songti SC", "SimSun", "PingFang SC", "Microsoft YaHei", serif;
}

canvas { display: block; }

.hidden { display: none !important; }

/* ---------- 通用页面 ---------- */
.page {
  position: fixed;
  inset: 0;
}

/* ============================================================
   介绍页（图一风格）
   ============================================================ */
.page--intro {
  display: flex;
  align-items: center;
  justify-content: center;
  /* 森林氛围背景：浅绿渐变 + 柔光 */
  background:
    radial-gradient(circle at 50% 35%, rgba(255,255,255,0.35) 0%, rgba(255,255,255,0) 55%),
    linear-gradient(160deg, #cfe3c2 0%, #a9c98f 45%, #7aa86b 100%);
  padding: 16px;
  z-index: 20;
}

.card {
  width: 100%;
  max-width: 560px;
  padding: 40px 36px 32px;
  background: rgba(247, 251, 240, 0.94);
  border: 1.5px solid rgba(122, 168, 107, 0.55);
  border-radius: 14px;
  text-align: center;
  box-shadow: 0 20px 60px rgba(60, 90, 50, 0.25);
  backdrop-filter: blur(4px);
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  opacity: 0.6;
}

.card h1 {
  margin: 0;
  font-size: clamp(2.6rem, 9vw, 4.4rem);
  font-weight: normal;
  letter-spacing: 0.14em;
  color: #4a6b3a;
}

.sub {
  margin: 10px 0 24px;
  font-size: 1.1rem;
  line-height: 1.7;
  opacity: 0.75;
  font-style: italic;
}

.gestures {
  list-style: none;
  padding: 0;
  margin: 0 0 26px;
  text-align: left;
  line-height: 2.1;
  font-size: 1rem;
}

.gestures li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 2px 6px;
}

.gesture-emo {
  font-style: normal;
  font-size: 1.15rem;
  width: 1.6em;
  text-align: center;
}

.gestures b {
  color: #3d5c2e;
  min-width: 3.4em;
  display: inline-block;
}

.hint {
  margin: 0 0 22px;
  font-size: 0.85rem;
  opacity: 0.6;
  line-height: 1.6;
}

.btn {
  font-family: inherit;
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  padding: 14px 44px;
  border: none;
  border-radius: 8px;
  background: #6f9960;
  color: #fff;
  cursor: pointer;
  transition: filter 0.2s, transform 0.2s;
}

.btn:hover { filter: brightness(1.12); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

/* ============================================================
   森林页 · HUD
   ============================================================ */
.hud {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 18px 22px;
  pointer-events: none;
  z-index: 5;
}

.hud-left {
  display: flex;
  flex-direction: column;
  gap: 2px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

#emotion-label {
  font-size: 1.5rem;
  letter-spacing: 0.16em;
  color: #fff;
  font-weight: bold;
}

#mood-label {
  font-size: 1rem;
  color: rgba(255,255,255,0.85);
  font-style: italic;
}

.hud-right {
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem;
  background: rgba(0,0,0,0.18);
  padding: 6px 12px;
  border-radius: 20px;
}

.kbd {
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: 4px;
  padding: 0 6px;
  font-size: 0.8em;
  margin-right: 2px;
}

/* 状态提示条 */
.status {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  font-size: 0.9rem;
  padding: 8px 18px;
  border-radius: 24px;
  background: rgba(247, 251, 240, 0.92);
  color: #3d5c2e;
  pointer-events: none;
  z-index: 30;
  white-space: nowrap;
  max-width: calc(100vw - 40px);
  overflow: hidden;
  text-overflow: ellipsis;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  transition: opacity 0.6s;
}

/* 情绪变化时的过渡遮罩 */
#fade {
  position: fixed;
  inset: 0;
  background: #fff;
  opacity: 0;
  pointer-events: none;
  z-index: 40;
  transition: opacity 0.9s ease;
}