:root {
  --bg: #07080a;
  --fg: #f2f4f8;
  --dim: #9aa4b2;
  --accent: #4da3ff;
  --ok: #43c97a;
  --warn: #f0a53e;
  --err: #ef5350;
  --panel: rgba(14, 17, 22, .82);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  overflow: hidden;
  user-select: none;
}

#stage {
  position: fixed;
  inset: 0;
  background: #000;
  cursor: none;
}
#stage.show-ui { cursor: pointer; }

#video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

/* ---------- 状态浮层 ---------- */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 40px;
  text-align: center;
  background: radial-gradient(circle at 50% 40%, rgba(20, 26, 36, .92), rgba(4, 6, 9, .97));
  transition: opacity .35s ease;
}
.overlay.hide {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, .15);
  border-top-color: var(--accent);
  animation: spin 1s linear infinite;
}
.spinner.hide { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

.title { font-size: 30px; font-weight: 650; letter-spacing: .5px; }
.title.ok { color: var(--ok); }
.title.err { color: var(--err); }

.hint { font-size: 17px; color: var(--dim); max-width: 760px; line-height: 1.6; }

.steps {
  margin: 8px 0 0;
  padding: 18px 26px 18px 44px;
  text-align: left;
  font-size: 16px;
  line-height: 2;
  color: var(--dim);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, .07);
  border-radius: 14px;
}
.steps b { color: var(--fg); font-weight: 600; }
.steps.hide { display: none; }

.btn {
  margin-top: 8px;
  padding: 14px 30px;
  font-size: 18px;
  font-weight: 600;
  color: #06121f;
  background: var(--accent);
  border: 0;
  border-radius: 12px;
  cursor: pointer;
}
.btn:active { transform: scale(.97); }

/* ---------- HUD ---------- */
.hud {
  position: absolute;
  left: 16px;
  top: 14px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  color: var(--dim);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, .07);
  border-radius: 999px;
  opacity: 0;
  transition: opacity .3s ease;
  pointer-events: none;
  backdrop-filter: blur(6px);
}
.hud.show { opacity: 1; }
.hud .dot { opacity: .4; }
.hud.live #hudState { color: var(--ok); }
.hud.bad #hudState { color: var(--err); }

/* ---------- 工具栏 ---------- */
.toolbar {
  position: absolute;
  right: 16px;
  top: 14px;
  display: flex;
  gap: 8px;
  opacity: 0;
  transition: opacity .3s ease;
}
.toolbar.show { opacity: 1; }

.tbtn {
  width: 48px;
  height: 48px;
  font-size: 20px;
  color: var(--fg);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, .09);
  border-radius: 12px;
  cursor: pointer;
  backdrop-filter: blur(6px);
}
.tbtn:active { transform: scale(.94); }
.tbtn.on { color: #06121f; background: var(--accent); border-color: transparent; }

/* ---------- 发送端页面（share.html） ---------- */
.share-body {
  overflow: auto;
  display: block;
  padding: 24px 18px 40px;
}
.share-wrap {
  max-width: 720px;
  margin: 0 auto;
}
.share-wrap h1 {
  font-size: 26px;
  margin: 8px 0 6px;
}
.share-sub {
  color: var(--dim);
  font-size: 15px;
  line-height: 1.6;
  margin: 0 0 18px;
}
#preview {
  width: 100%;
  max-height: 42vh;
  background: #000;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 14px;
  object-fit: contain;
}
#preview:not([srcObject]) { display: none; }
.share-status {
  margin: 16px 0;
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid rgba(255,255,255,.07);
  color: var(--dim);
  font-size: 15px;
  line-height: 1.5;
}
.share-status.ok { color: var(--ok); border-color: rgba(67,201,122,.35); }
.share-status.err { color: var(--err); border-color: rgba(239,83,80,.35); }
.share-actions { display: flex; flex-direction: column; gap: 10px; }
.btn.big {
  width: 100%;
  padding: 18px 20px;
  font-size: 18px;
  border-radius: 14px;
}
.btn.ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid rgba(255,255,255,.18);
}
.btn.danger { background: var(--err); color: #fff; }
.share-tips {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--dim);
}
.share-details {
  margin-top: 22px;
  font-size: 14px;
  color: var(--dim);
  line-height: 1.7;
}
.share-details summary { cursor: pointer; color: var(--fg); }
.share-details code { word-break: break-all; }