html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", sans-serif;
}

#videoCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  display: block;
  background: #000;
}

#loading {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: 18px;
  letter-spacing: 1px;
  pointer-events: none;
  z-index: 10;
}

/* ===== 密码遮罩 ===== */
#pwd-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pwd-box {
  width: 320px;
  padding: 28px 24px;
  background: #1f2937;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  text-align: center;
}

.pwd-title {
  color: #fff;
  font-size: 18px;
  margin-bottom: 18px;
  letter-spacing: 2px;
}

#pwd-input {
  width: 100%;
  padding: 10px 12px;
  font-size: 15px;
  background: #111827;
  color: #fff;
  border: 1px solid #374151;
  border-radius: 6px;
  outline: none;
  box-sizing: border-box;
  letter-spacing: 4px;
  text-align: center;
}

#pwd-input:focus {
  border-color: #3b82f6;
}

.pwd-msg {
  min-height: 20px;
  margin: 10px 0 14px;
  font-size: 13px;
  color: #f87171;
}

#pwd-btn {
  width: 100%;
  padding: 10px;
  font-size: 15px;
  color: #fff;
  background: #3b82f6;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 4px;
}

#pwd-btn:hover { background: #2563eb; }
#pwd-btn:disabled { background: #6b7280; cursor: not-allowed; }

/* ===== Admin 改密码页 ===== */
.admin-body {
  background: #f5f7fa;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.admin-card {
  width: 360px;
  padding: 28px 28px 24px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.admin-title {
  font-size: 18px;
  color: #1e293b;
  margin-bottom: 20px;
  text-align: center;
  font-weight: 600;
}

.admin-row {
  margin-bottom: 14px;
}

.admin-row label {
  display: block;
  font-size: 13px;
  color: #64748b;
  margin-bottom: 6px;
}

.admin-row input {
  width: 100%;
  padding: 9px 12px;
  font-size: 14px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  outline: none;
  box-sizing: border-box;
}

.admin-row input:focus {
  border-color: #3b82f6;
}

.admin-msg {
  min-height: 20px;
  margin: 8px 0 14px;
  font-size: 13px;
  text-align: center;
  color: #64748b;
}

#admin-btn {
  width: 100%;
  padding: 10px;
  font-size: 14px;
  color: #fff;
  background: #3b82f6;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  letter-spacing: 2px;
}

#admin-btn:hover { background: #2563eb; }
#admin-btn:disabled { background: #94a3b8; cursor: not-allowed; }